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GNU AFFERO GENERAL PUBLIC LICENSE
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# DroidFS
DroidFS is an implementation of encrypted overlay filesystems for Android.
It allows you to store files and folder in encrypted virtual volumes so that you can share them, store them in the cloud or simply access them more securely.
It currently only supports [gocryptfs](https://github.com/rfjakob/gocryptfs) but support for [CryFS](https://github.com/cryfs/cryfs) is expected to be added soon.<br>
DroidFS require Android API level 21+ (Android Lollipop).
# Disclamer
DroidFS is provided "as is", without any warranty of any kind.
It shouldn't be considered an absolute safe way to store files.
DroidFS cannot protect you from screen recording apps, keyloggers, apk backdooring, compromised root accesses, memory dumps etc.
Do not use this app with volumes containing sensitive data unless you know exactly what you are doing.
# Unsafe features
DroidFS allows you to enable/disable unsafe features to fit your needs between security and comfort.
It is strongly recommended to read the documentation of a feature before enabling it.
#### Allow screenshots:
Disable the secure flag of DroidFS activities. This will allow you to take screenshots from the app, but will also allow other apps to record the screen while using DroidFS.
Note: apps with root access don't care about this flag: they can take screenshots or record the screen of any app without any permissions.
#### Allow opening files with other applications:
Decrypt and open file using external apps. This require writing the plain file to disk (DroidFS internal storage).
#### Allow exporting files:
Decrypt and write file to disk (external storage). Any app with storage permissions can access exported files.
#### Allow sharing files via the android share menu:
Decrypt and share file with other apps. This require writing the plain file to disk (DroidFS internal storage).
#### Allow saving password hash using fingerprint:
Generate an AES-256 GCM key in the Android Keystore (protected by fingerprint authentication), then use it to encrypt the volume password hash and store it to the DroidFS internal storage. This require Android v6.0+
# Download
You can download the latest version [here](https://github.com/hardcore-sushi/DroidFS/releases).
# Build
Most of the original gocryptfs code was used as is (written in Go) and compiled to native code. That's why you need [Go](https://golang.org) and the [Android Native Development Kit (NDK)](https://developer.android.com/ndk/) to build DroidFS from source.
#### Install Requirements
- [Android Studio](https://developer.android.com/studio/)
- [Android NDK and CMake](https://developer.android.com/studio/projects/install-ndk)
- [Go](https://golang.org/doc/install)
#### Download Sources
```
$ git clone https://github.com/hardcore-sushi/DroidFS.git
```
Gocryptfs need openssl to work:
```
$ cd DroidFS/app/libgocryptfs
$ wget -qO - https://www.openssl.org/source/openssl-1.1.1g.tar.gz | tar -xvzf -
```
#### Build
First, we need to build libgocryptfs.<br>
Retrieve your Android NDK installation path, usually someting like "\<Android SDK path\>/ndk/\<NDK version\>".
```
$ cd DroidFS/app/libgocryptfs
$ env ANDROID_NDK_HOME="<your ndk path>" OPENSSL_PATH="./openssl-1.1.1g" ./build.sh
```
Then, open the DroidFS project with Android Studio.<br>
If a device (virtual or physical) is connected, just click on "Run".<br>
If you want to generate a signed APK, you can follow this [post](https://stackoverflow.com/a/28938286).

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cmake_minimum_required(VERSION 3.4.1)
add_library(
gocryptfs
SHARED
IMPORTED
)
set_target_properties(
gocryptfs
PROPERTIES IMPORTED_LOCATION
${PROJECT_SOURCE_DIR}/libgocryptfs/build/${ANDROID_ABI}/libgocryptfs.so
)
add_library(
gocryptfs_jni
SHARED
src/main/native/gocryptfs_jni.c
)
target_link_libraries(
gocryptfs_jni
gocryptfs
)
include_directories(
${PROJECT_SOURCE_DIR}/libgocryptfs/build/${ANDROID_ABI}/
)

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apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
android {
compileSdkVersion 29
buildToolsVersion "30.0.0"
defaultConfig {
applicationId "sushi.hardcore.droidfs"
minSdkVersion 21
targetSdkVersion 28
versionCode 1
versionName "1.0"
ndk {
abiFilters 'x86_64', 'armeabi-v7a', 'arm64-v8a'
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path file('CMakeLists.txt')
}
}
}
dependencies {
implementation fileTree(dir: "libs", include: ["*.jar"])
implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
implementation 'androidx.core:core-ktx:1.3.0'
implementation 'androidx.appcompat:appcompat:1.1.0'
testImplementation 'junit:junit:4.12'
implementation 'androidx.sqlite:sqlite:2.1.0'
implementation 'androidx.preference:preference:1.1.1'
implementation 'com.github.clans:fab:1.6.4'
implementation 'com.jaredrummler:cyanea:1.0.2'
}

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openssl*
lib
include
build

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#!/bin/bash
if [ -z ${ANDROID_NDK_HOME+x} ]; then
echo "Error: \$ANDROID_NDK_HOME is not defined."
elif [ -z ${OPENSSL_PATH+x} ]; then
echo "Error: \$OPENSSL_PATH is not defined."
else
NDK_BIN_PATH="$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/bin"
declare -a ABIs=("x86_64" "arm64-v8a" "armeabi-v7a")
compile_openssl(){
if [ ! -d "./lib/$1" ]; then
if [ "$1" = "x86_64" ]; then
OPENSSL_ARCH="android-x86_64"
elif [ "$1" = "arm64-v8a" ]; then
OPENSSL_ARCH="android-arm64"
elif [ "$1" = "armeabi-v7a" ]; then
OPENSSL_ARCH="android-arm"
else
echo "Invalid ABI: $1"
exit
fi
export CFLAGS=-D__ANDROID_API__=21
export PATH=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/bin:$ANDROID_NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin:$PATH
(cd "$OPENSSL_PATH" && if [ -f "Makefile" ]; then make clean; fi && ./Configure $OPENSSL_ARCH -D__ANDROID_API__=21 no-stdio && make build_libs)
mkdir -p "./lib/$1" && cp "$OPENSSL_PATH/libcrypto.a" "$OPENSSL_PATH/libssl.a" "./lib/$1"
mkdir -p "./include/$1" && cp -r "$OPENSSL_PATH"/include/* "./include/$1/"
fi
}
compile_for_arch(){
compile_openssl $1
MAIN_PACKAGE="main.go"
if [ "$1" = "x86_64" ]; then
CFN="x86_64-linux-android21-clang"
elif [ "$1" = "arm64-v8a" ]; then
CFN="aarch64-linux-android21-clang"
export GOARCH=arm64
export GOARM=7
elif [ "$1" = "armeabi-v7a" ]; then
CFN="armv7a-linux-androideabi21-clang"
export GOARCH=arm
export GOARM=7
MAIN_PACKAGE="main32.go"
#patch arch specific code
sed "s/C.malloc(C.ulong/C.malloc(C.uint/g" main.go > $MAIN_PACKAGE
sed -i "s/st.Mtim.Sec/int64(st.Mtim.Sec)/g" $MAIN_PACKAGE
else
echo "Invalid ABI: $1"
exit
fi
export CC="$NDK_BIN_PATH/$CFN"
export CXX="$NDK_BIN_PATH/$CFN++"
export CGO_ENABLED=1
export GOOS=android
export CGO_CFLAGS="-I ${PWD}/include/$1"
export CGO_LDFLAGS="-Wl,-soname=libgocryptfs.so -L${PWD}/lib/$1"
go build -o build/$1/libgocryptfs.so -buildmode=c-shared $MAIN_PACKAGE
if [ $MAIN_PACKAGE = "main32.go" ]; then
rm $MAIN_PACKAGE
fi
}
if [ "$#" -eq 1 ]; then
compile_for_arch $1
else
for abi in ${ABIs[@]}; do
echo "Compiling for $abi..."
compile_for_arch $abi
done
fi
echo "Done."
fi

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// Package cryptocore wraps OpenSSL and Go GCM crypto and provides
// a nonce generator.
package cryptocore
import (
"crypto/aes"
"crypto/cipher"
"crypto/sha512"
"fmt"
"log"
"runtime"
"../eme"
"../siv_aead"
"../stupidgcm"
)
const (
// KeyLen is the cipher key length in bytes. 32 for AES-256.
KeyLen = 32
// AuthTagLen is the length of a GCM auth tag in bytes.
AuthTagLen = 16
)
// AEADTypeEnum indicates the type of AEAD backend in use.
type AEADTypeEnum int
const (
// BackendOpenSSL specifies the OpenSSL backend.
BackendOpenSSL AEADTypeEnum = 3
// BackendGoGCM specifies the Go based GCM backend.
BackendGoGCM AEADTypeEnum = 4
// BackendAESSIV specifies an AESSIV backend.
BackendAESSIV AEADTypeEnum = 5
)
// CryptoCore is the low level crypto implementation.
type CryptoCore struct {
// EME is used for filename encryption.
EMECipher *eme.EMECipher
// GCM or AES-SIV. This is used for content encryption.
AEADCipher cipher.AEAD
// Which backend is behind AEADCipher?
AEADBackend AEADTypeEnum
// GCM needs unique IVs (nonces)
IVGenerator *nonceGenerator
IVLen int
}
// New returns a new CryptoCore object or panics.
//
// Even though the "GCMIV128" feature flag is now mandatory, we must still
// support 96-bit IVs here because they were used for encrypting the master
// key in gocryptfs.conf up to gocryptfs v1.2. v1.3 switched to 128 bits.
//
// Note: "key" is either the scrypt hash of the password (when decrypting
// a config file) or the masterkey (when finally mounting the filesystem).
func New(key []byte, aeadType AEADTypeEnum, IVBitLen int, useHKDF bool, forceDecode bool) *CryptoCore {
if len(key) != KeyLen {
log.Panic(fmt.Sprintf("Unsupported key length %d", len(key)))
}
// We want the IV size in bytes
IVLen := IVBitLen / 8
// Initialize EME for filename encryption.
var emeCipher *eme.EMECipher
var err error
{
var emeBlockCipher cipher.Block
if useHKDF {
emeKey := HkdfDerive(key, HkdfInfoEMENames, KeyLen)
emeBlockCipher, err = aes.NewCipher(emeKey)
for i := range emeKey {
emeKey[i] = 0
}
} else {
emeBlockCipher, err = aes.NewCipher(key)
}
if err != nil {
log.Panic(err)
}
emeCipher = eme.New(emeBlockCipher)
}
// Initialize an AEAD cipher for file content encryption.
var aeadCipher cipher.AEAD
if aeadType == BackendOpenSSL || aeadType == BackendGoGCM {
var gcmKey []byte
if useHKDF {
gcmKey = HkdfDerive(key, hkdfInfoGCMContent, KeyLen)
} else {
gcmKey = append([]byte{}, key...)
}
switch aeadType {
case BackendOpenSSL:
if IVLen != 16 {
log.Panic("stupidgcm only supports 128-bit IVs")
}
aeadCipher = stupidgcm.New(gcmKey, forceDecode)
case BackendGoGCM:
goGcmBlockCipher, err := aes.NewCipher(gcmKey)
if err != nil {
log.Panic(err)
}
aeadCipher, err = cipher.NewGCMWithNonceSize(goGcmBlockCipher, IVLen)
if err != nil {
log.Panic(err)
}
}
for i := range gcmKey {
gcmKey[i] = 0
}
} else if aeadType == BackendAESSIV {
if IVLen != 16 {
// SIV supports any nonce size, but we only use 16.
log.Panic("AES-SIV must use 16-byte nonces")
}
// AES-SIV uses 1/2 of the key for authentication, 1/2 for
// encryption, so we need a 64-bytes key for AES-256. Derive it from
// the 32-byte master key using HKDF, or, for older filesystems, with
// SHA256.
var key64 []byte
if useHKDF {
key64 = HkdfDerive(key, hkdfInfoSIVContent, siv_aead.KeyLen)
} else {
s := sha512.Sum512(key)
key64 = s[:]
}
aeadCipher = siv_aead.New(key64)
for i := range key64 {
key64[i] = 0
}
} else {
log.Panic("unknown backend cipher")
}
return &CryptoCore{
EMECipher: emeCipher,
AEADCipher: aeadCipher,
AEADBackend: aeadType,
IVGenerator: &nonceGenerator{nonceLen: IVLen},
IVLen: IVLen,
}
}
type wiper interface {
Wipe()
}
// Wipe tries to wipe secret keys from memory by overwriting them with zeros
// and/or setting references to nil.
//
// This is not bulletproof due to possible GC copies, but
// still raises to bar for extracting the key.
func (c *CryptoCore) Wipe() {
be := c.AEADBackend
if be == BackendOpenSSL || be == BackendAESSIV {
// We don't use "x, ok :=" because we *want* to crash loudly if the
// type assertion fails.
w := c.AEADCipher.(wiper)
w.Wipe()
}
// We have no access to the keys (or key-equivalents) stored inside the
// Go stdlib. Best we can is to nil the references and force a GC.
c.AEADCipher = nil
c.EMECipher = nil
runtime.GC()
}

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package cryptocore
import (
"crypto/sha256"
"log"
"golang.org/x/crypto/hkdf"
)
const (
// "info" data that HKDF mixes into the generated key to make it unique.
// For convenience, we use a readable string.
HkdfInfoEMENames = "EME filename encryption"
hkdfInfoGCMContent = "AES-GCM file content encryption"
hkdfInfoSIVContent = "AES-SIV file content encryption"
)
// hkdfDerive derives "outLen" bytes from "masterkey" and "info" using
// HKDF-SHA256 (RFC 5869).
// It returns the derived bytes or panics.
func HkdfDerive(masterkey []byte, info string, outLen int) (out []byte) {
h := hkdf.New(sha256.New, masterkey, nil, []byte(info))
out = make([]byte, outLen)
n, err := h.Read(out)
if n != outLen || err != nil {
log.Panicf("hkdfDerive: hkdf read failed, got %d bytes, error: %v", n, err)
}
return out
}

32
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package cryptocore
import (
"crypto/rand"
"encoding/binary"
"log"
)
// RandBytes gets "n" random bytes from /dev/urandom or panics
func RandBytes(n int) []byte {
b := make([]byte, n)
_, err := rand.Read(b)
if err != nil {
log.Panic("Failed to read random bytes: " + err.Error())
}
return b
}
// RandUint64 returns a secure random uint64
func RandUint64() uint64 {
b := RandBytes(8)
return binary.BigEndian.Uint64(b)
}
type nonceGenerator struct {
nonceLen int // bytes
}
// Get a random "nonceLen"-byte nonce
func (n *nonceGenerator) Get() []byte {
return randPrefetcher.read(n.nonceLen)
}

55
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package cryptocore
import (
"bytes"
"log"
"sync"
)
// Number of bytes to prefetch.
// 512 looks like a good compromise between throughput and latency - see
// randsize_test.go for numbers.
const prefetchN = 512
func init() {
randPrefetcher.refill = make(chan []byte)
go randPrefetcher.refillWorker()
}
type randPrefetcherT struct {
sync.Mutex
buf bytes.Buffer
refill chan []byte
}
func (r *randPrefetcherT) read(want int) (out []byte) {
out = make([]byte, want)
r.Lock()
// Note: don't use defer, it slows us down!
have, err := r.buf.Read(out)
if have == want && err == nil {
r.Unlock()
return out
}
// Buffer was empty -> re-fill
fresh := <-r.refill
if len(fresh) != prefetchN {
log.Panicf("randPrefetcher: refill: got %d bytes instead of %d", len(fresh), prefetchN)
}
r.buf.Reset()
r.buf.Write(fresh)
have, err = r.buf.Read(out)
if have != want || err != nil {
log.Panicf("randPrefetcher could not satisfy read: have=%d want=%d err=%v", have, want, err)
}
r.Unlock()
return out
}
func (r *randPrefetcherT) refillWorker() {
for {
r.refill <- RandBytes(prefetchN)
}
}
var randPrefetcher randPrefetcherT

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language: go
go:
- 1.11.x # Debian 10 "Buster"
- 1.12.x # Ubuntu 19.10
- 1.13.x # Debian 11 "Bullseye"
- stable
script:
- go build
- ./test.bash

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The MIT License (MIT)
Copyright (c) 2015 Jakob Unterwurzacher
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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EME for Go [![Build Status](https://travis-ci.org/rfjakob/eme.svg?branch=master)](https://travis-ci.org/rfjakob/eme) [![GoDoc](https://godoc.org/github.com/rfjakob/eme?status.svg)](https://godoc.org/github.com/rfjakob/eme) ![MIT License](https://img.shields.io/badge/license-MIT-blue.svg)
==========
**EME** (ECB-Mix-ECB or, clearer, **Encrypt-Mix-Encrypt**) is a wide-block
encryption mode developed by Halevi
and Rogaway in 2003 [[eme]](#eme).
EME uses multiple invocations of a block cipher to construct a new
cipher of bigger block size (in multiples of 16 bytes, up to 2048 bytes).
Quoting from the original [[eme]](#eme) paper:
> We describe a block-cipher mode of operation, EME, that turns an n-bit block cipher into
> a tweakable enciphering scheme that acts on strings of mn bits, where m ∈ [1..n]. The mode is
> parallelizable, but as serial-efficient as the non-parallelizable mode CMC [6]. EME can be used
> to solve the disk-sector encryption problem. The algorithm entails two layers of ECB encryption
> and a “lightweight mixing” in between. We prove EME secure, in the reduction-based sense of
> modern cryptography.
Figure 2 from the [[eme]](#eme) paper shows an overview of the transformation:
[![Figure 2 from [eme]](paper-eme-fig2.png)](#)
This is an implementation of EME in Go, complete with test vectors from IEEE [[p1619-2]](#p1619-2)
and Halevi [[eme-32-testvec]](#eme-32-testvec).
It has no dependencies outside the standard library.
Is it patentend?
----------------
In 2007, the UC Davis has decided to abandon [[patabandon]](#patabandon)
the patent application [[patappl]](#patappl) for EME.
Related algorithms
------------------
**EME-32** is EME with the cipher set to AES and the length set to 512.
That is, EME-32 [[eme-32-pdf]](#eme-32-pdf) is a subset of EME.
**EME2**, also known as EME\* [[emestar]](#emestar), is an extended version of EME
that has built-in handling for data that is not a multiple of 16 bytes
long.
EME2 has been selected for standardization in IEEE P1619.2 [[p1619.2]](#p1619.2).
References
----------
#### [eme]
*A Parallelizable Enciphering Mode*
Shai Halevi, Phillip Rogaway, 28 Jul 2003
https://eprint.iacr.org/2003/147.pdf
Note: This is the original EME paper. EME is specified for an arbitrary
number of block-cipher blocks. EME-32 is a concrete implementation of
EME with a fixed length of 32 AES blocks.
#### [eme-32-email]
*Re: EME-32-AES with editorial comments*
Shai Halevi, 07 Jun 2005
http://grouper.ieee.org/groups/1619/email/msg00310.html
#### [eme-32-pdf]
*Draft Standard for Tweakable Wide-block Encryption*
Shai Halevi, 02 June 2005
http://grouper.ieee.org/groups/1619/email/pdf00020.pdf
Note: This is the latest version of the EME-32 draft that I could find. It
includes test vectors and C source code.
#### [eme-32-testvec]
*Re: Test vectors for LRW and EME*
Shai Halevi, 16 Nov 2004
http://grouper.ieee.org/groups/1619/email/msg00218.html
#### [emestar]
*EME\*: extending EME to handle arbitrary-length messages with associated data*
Shai Halevi, 27 May 2004
https://eprint.iacr.org/2004/125.pdf
#### [patabandon]
*Re: [P1619-2] Non-awareness patent statement made by UC Davis*
Mat Ball, 26 Nov 2007
http://grouper.ieee.org/groups/1619/email-2/msg00005.html
#### [patappl]
*Block cipher mode of operation for constructing a wide-blocksize block cipher from a conventional block cipher*
US patent application US20040131182
http://www.google.com/patents/US20040131182
#### [p1619-2]
*IEEE P1619.2™/D9 Draft Standard for Wide-Block Encryption for Shared Storage Media*
IEEE, Dec 2008
http://siswg.net/index2.php?option=com_docman&task=doc_view&gid=156&Itemid=41
Note: This is a draft version. The final version is not freely available
and must be bought from IEEE.
Package Changelog
-----------------
v1.1.1, 2020-04-13
* Update `go vet` call in `test.bash` to work on recent Go versions
* No code changes
v1.1, 2017-03-05
* Add eme.New() / \*EMECipher convenience wrapper
* Improve panic message and parameter wording
v1.0, 2015-12-08
* Stable release

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#!/bin/bash -eu
go test -bench=.

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// EME (ECB-Mix-ECB or, clearer, Encrypt-Mix-Encrypt) is a wide-block
// encryption mode developed by Halevi and Rogaway.
//
// It was presented in the 2003 paper "A Parallelizable Enciphering Mode" by
// Halevi and Rogaway.
//
// EME uses multiple invocations of a block cipher to construct a new cipher
// of bigger block size (in multiples of 16 bytes, up to 2048 bytes).
package eme
import (
"crypto/cipher"
"log"
)
type directionConst bool
const (
// Encrypt "inputData"
DirectionEncrypt = directionConst(true)
// Decrypt "inputData"
DirectionDecrypt = directionConst(false)
)
// multByTwo - GF multiplication as specified in the EME-32 draft
func multByTwo(out []byte, in []byte) {
if len(in) != 16 {
panic("len must be 16")
}
tmp := make([]byte, 16)
tmp[0] = 2 * in[0]
if in[15] >= 128 {
tmp[0] = tmp[0] ^ 135
}
for j := 1; j < 16; j++ {
tmp[j] = 2 * in[j]
if in[j-1] >= 128 {
tmp[j] += 1
}
}
copy(out, tmp)
}
func xorBlocks(out []byte, in1 []byte, in2 []byte) {
if len(in1) != len(in2) {
log.Panicf("len(in1)=%d is not equal to len(in2)=%d", len(in1), len(in2))
}
for i := range in1 {
out[i] = in1[i] ^ in2[i]
}
}
// aesTransform - encrypt or decrypt (according to "direction") using block
// cipher "bc" (typically AES)
func aesTransform(dst []byte, src []byte, direction directionConst, bc cipher.Block) {
if direction == DirectionEncrypt {
bc.Encrypt(dst, src)
return
} else if direction == DirectionDecrypt {
bc.Decrypt(dst, src)
return
}
}
// tabulateL - calculate L_i for messages up to a length of m cipher blocks
func tabulateL(bc cipher.Block, m int) [][]byte {
/* set L0 = 2*AESenc(K; 0) */
eZero := make([]byte, 16)
Li := make([]byte, 16)
bc.Encrypt(Li, eZero)
LTable := make([][]byte, m)
// Allocate pool once and slice into m pieces in the loop
pool := make([]byte, m*16)
for i := 0; i < m; i++ {
multByTwo(Li, Li)
LTable[i] = pool[i*16 : (i+1)*16]
copy(LTable[i], Li)
}
return LTable
}
// Transform - EME-encrypt or EME-decrypt, according to "direction"
// (defined in the constants DirectionEncrypt and DirectionDecrypt).
// The data in "inputData" is en- or decrypted with the block ciper "bc" under
// "tweak" (also known as IV).
//
// The tweak is used to randomize the encryption in the same way as an
// IV. A use of this encryption mode envisioned by the authors of the
// algorithm was to encrypt each sector of a disk, with the tweak
// being the sector number. If you encipher the same data with the
// same tweak you will get the same ciphertext.
//
// The result is returned in a freshly allocated slice of the same
// size as inputData.
//
// Limitations:
// * The block cipher must have block size 16 (usually AES).
// * The size of "tweak" must be 16
// * "inputData" must be a multiple of 16 bytes long
// If any of these pre-conditions are not met, the function will panic.
//
// Note that you probably don't want to call this function directly and instead
// use eme.New(), which provides conventient wrappers.
func Transform(bc cipher.Block, tweak []byte, inputData []byte, direction directionConst) []byte {
// In the paper, the tweak is just called "T". Call it the same here to
// make following the paper easy.
T := tweak
// In the paper, the plaintext data is called "P" and the ciphertext is
// called "C". Because encryption and decryption are virtually identical,
// we share the code and always call the input data "P" and the output data
// "C", regardless of the direction.
P := inputData
if bc.BlockSize() != 16 {
log.Panicf("Using a block size other than 16 is not implemented")
}
if len(T) != 16 {
log.Panicf("Tweak must be 16 bytes long, is %d", len(T))
}
if len(P)%16 != 0 {
log.Panicf("Data P must be a multiple of 16 long, is %d", len(P))
}
m := len(P) / 16
if m == 0 || m > 16*8 {
log.Panicf("EME operates on 1 to %d block-cipher blocks, you passed %d", 16*8, m)
}
C := make([]byte, len(P))
LTable := tabulateL(bc, m)
PPj := make([]byte, 16)
for j := 0; j < m; j++ {
Pj := P[j*16 : (j+1)*16]
/* PPj = 2**(j-1)*L xor Pj */
xorBlocks(PPj, Pj, LTable[j])
/* PPPj = AESenc(K; PPj) */
aesTransform(C[j*16:(j+1)*16], PPj, direction, bc)
}
/* MP =(xorSum PPPj) xor T */
MP := make([]byte, 16)
xorBlocks(MP, C[0:16], T)
for j := 1; j < m; j++ {
xorBlocks(MP, MP, C[j*16:(j+1)*16])
}
/* MC = AESenc(K; MP) */
MC := make([]byte, 16)
aesTransform(MC, MP, direction, bc)
/* M = MP xor MC */
M := make([]byte, 16)
xorBlocks(M, MP, MC)
CCCj := make([]byte, 16)
for j := 1; j < m; j++ {
multByTwo(M, M)
/* CCCj = 2**(j-1)*M xor PPPj */
xorBlocks(CCCj, C[j*16:(j+1)*16], M)
copy(C[j*16:(j+1)*16], CCCj)
}
/* CCC1 = (xorSum CCCj) xor T xor MC */
CCC1 := make([]byte, 16)
xorBlocks(CCC1, MC, T)
for j := 1; j < m; j++ {
xorBlocks(CCC1, CCC1, C[j*16:(j+1)*16])
}
copy(C[0:16], CCC1)
for j := 0; j < m; j++ {
/* CCj = AES-enc(K; CCCj) */
aesTransform(C[j*16:(j+1)*16], C[j*16:(j+1)*16], direction, bc)
/* Cj = 2**(j-1)*L xor CCj */
xorBlocks(C[j*16:(j+1)*16], C[j*16:(j+1)*16], LTable[j])
}
return C
}
// EMECipher provides EME-Encryption and -Decryption functions that are more
// convenient than calling Transform directly.
type EMECipher struct {
bc cipher.Block
}
// New returns a new EMECipher object. "bc" must have a block size of 16,
// or subsequent calls to Encrypt and Decrypt will panic.
func New(bc cipher.Block) *EMECipher {
return &EMECipher{
bc: bc,
}
}
// Encrypt is equivalent to calling Transform with direction=DirectionEncrypt.
func (e *EMECipher) Encrypt(tweak []byte, inputData []byte) []byte {
return Transform(e.bc, tweak, inputData, DirectionEncrypt)
}
// Decrypt is equivalent to calling Transform with direction=DirectionDecrypt.
func (e *EMECipher) Decrypt(tweak []byte, inputData []byte) []byte {
return Transform(e.bc, tweak, inputData, DirectionDecrypt)
}

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// Package exitcodes contains all well-defined exit codes that gocryptfs
// can return.
package exitcodes
import (
"fmt"
"os"
)
const (
// Usage - usage error like wrong cli syntax, wrong number of parameters.
Usage = 1
// 2 is reserved because it is used by Go panic
// 3 is reserved because it was used by earlier gocryptfs version as a generic
// "mount" error.
// CipherDir means that the CIPHERDIR does not exist, is not empty, or is not
// a directory.
CipherDir = 6
// Init is an error on filesystem init
Init = 7
// LoadConf is an error while loading gocryptfs.conf
LoadConf = 8
// ReadPassword means something went wrong reading the password
ReadPassword = 9
// MountPoint error means that the mountpoint is invalid (not empty etc).
MountPoint = 10
// Other error - please inspect the message
Other = 11
// PasswordIncorrect - the password was incorrect when mounting or when
// changing the password.
PasswordIncorrect = 12
// ScryptParams means that scrypt was called with invalid parameters
ScryptParams = 13
// MasterKey means that something went wrong when parsing the "-masterkey"
// command line option
MasterKey = 14
// SigInt means we got SIGINT
SigInt = 15
// PanicLogNotEmpty means the panic log was not empty when we were unmounted
PanicLogNotEmpty = 16
// ForkChild means forking the worker child failed
ForkChild = 17
// OpenSSL means you tried to enable OpenSSL, but we were compiled without it.
OpenSSL = 18
// FuseNewServer - this exit code means that the call to fuse.NewServer failed.
// This usually means that there was a problem executing fusermount, or
// fusermount could not attach the mountpoint to the kernel.
FuseNewServer = 19
// CtlSock - the control socket file could not be created.
CtlSock = 20
// Downgraded to a warning in gocryptfs v1.4
//PanicLogCreate = 21
// PasswordEmpty - we received an empty password
PasswordEmpty = 22
// OpenConf - the was an error opening the gocryptfs.conf file for reading
OpenConf = 23
// WriteConf - could not write the gocryptfs.conf
WriteConf = 24
// Profiler - error occurred when trying to write cpu or memory profile or
// execution trace
Profiler = 25
// FsckErrors - the filesystem check found errors
FsckErrors = 26
// DeprecatedFS - this filesystem is deprecated
DeprecatedFS = 27
// skip 28
// ExcludeError - an error occurred while processing "-exclude"
ExcludeError = 29
// DevNull means that /dev/null could not be opened
DevNull = 30
)
// Err wraps an error with an associated numeric exit code
type Err struct {
error
code int
}
// NewErr returns an error containing "msg" and the exit code "code".
func NewErr(msg string, code int) Err {
return Err{
error: fmt.Errorf(msg),
code: code,
}
}
// Exit extracts the numeric exit code from "err" (if available) and exits the
// application.
func Exit(err error) {
err2, ok := err.(Err)
if !ok {
os.Exit(Other)
}
os.Exit(err2.code)
}

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# Compiled Object files, Static and Dynamic libs (Shared Objects)
*.o
*.a
*.so
# Folders
_obj
_test
# Architecture specific extensions/prefixes
*.[568vq]
[568vq].out
*.cgo1.go
*.cgo2.c
_cgo_defun.c
_cgo_gotypes.go
_cgo_export.*
_testmain.go
*.exe

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# Cf. http://docs.travis-ci.com/user/getting-started/
# Cf. http://docs.travis-ci.com/user/languages/go/
language: go

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Apache License
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http://www.apache.org/licenses/
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This repository contains Go packages related to cryptographic standards that are
not included in the Go standard library. These include:
* [SIV mode][siv], which provides deterministic encryption with
authentication.
* [CMAC][cmac], a message authentication system used by SIV mode.
[siv]: https://godoc.org/github.com/jacobsa/crypto/siv
[cmac]: https://godoc.org/github.com/jacobsa/crypto/cmac

23
app/libgocryptfs/gocryptfs_internal/jacobsa_crypto/cmac/const.go Normal file
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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmac
import "crypto/aes"
// The size of an AES-CMAC checksum, in bytes.
const Size = aes.BlockSize
const blockSize = Size

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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package cmac implements the CMAC mode for message authentication, as defined
// by NIST Special Publication 800-38B. When a 16-byte key is used, this
// matches the AES-CMAC algorithm defined by RFC 4493.
package cmac

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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmac
import (
"crypto/aes"
"crypto/cipher"
"fmt"
"hash"
"unsafe"
"../common"
)
type cmacHash struct {
// An AES cipher configured with the original key.
ciph cipher.Block
// Generated sub-keys.
k1 []byte
k2 []byte
// Data that has been seen by Write but not yet incorporated into x, due to
// us not being sure if it is the final block or not.
//
// INVARIANT: len(data) <= blockSize
data []byte
// The current value of X, as defined in the AES-CMAC algorithm in RFC 4493.
// Initially this is a 128-bit zero, and it is updated with the current block
// when we're sure it's not the last one.
x []byte
}
func (h *cmacHash) Write(p []byte) (n int, err error) {
n = len(p)
// First step: consume enough data to expand h.data to a full block, if
// possible.
{
toConsume := blockSize - len(h.data)
if toConsume > len(p) {
toConsume = len(p)
}
h.data = append(h.data, p[:toConsume]...)
p = p[toConsume:]
}
// If there's no data left in p, it means h.data might not be a full block.
// Even if it is, we're not sure it's the final block, which we must treat
// specially. So we must stop here.
if len(p) == 0 {
return
}
// h.data is a full block and is not the last; process it.
h.writeBlocks(h.data)
h.data = h.data[:0]
// Consume any further full blocks in p that we're sure aren't the last. Note
// that we're sure that len(p) is greater than zero here.
blocksToProcess := (len(p) - 1) / blockSize
bytesToProcess := blocksToProcess * blockSize
h.writeBlocks(p[:bytesToProcess])
p = p[bytesToProcess:]
// Store the rest for later.
h.data = append(h.data, p...)
return
}
// Process block-aligned data that we're sure does not contain the final block.
//
// REQUIRES: len(p) % blockSize == 0
func (h *cmacHash) writeBlocks(p []byte) {
y := make([]byte, blockSize)
for off := 0; off < len(p); off += blockSize {
block := p[off : off+blockSize]
xorBlock(
unsafe.Pointer(&y[0]),
unsafe.Pointer(&h.x[0]),
unsafe.Pointer(&block[0]))
h.ciph.Encrypt(h.x, y)
}
return
}
func (h *cmacHash) Sum(b []byte) []byte {
dataLen := len(h.data)
// We should have at most one block left.
if dataLen > blockSize {
panic(fmt.Sprintf("Unexpected data: %x", h.data))
}
// Calculate M_last.
mLast := make([]byte, blockSize)
if dataLen == blockSize {
common.Xor(mLast, h.data, h.k1)
} else {
// TODO(jacobsa): Accept a destination buffer in common.PadBlock and
// simplify this code.
common.Xor(mLast, common.PadBlock(h.data), h.k2)
}
y := make([]byte, blockSize)
common.Xor(y, mLast, h.x)
result := make([]byte, blockSize)
h.ciph.Encrypt(result, y)
b = append(b, result...)
return b
}
func (h *cmacHash) Reset() {
h.data = h.data[:0]
h.x = make([]byte, blockSize)
}
func (h *cmacHash) Size() int {
return h.ciph.BlockSize()
}
func (h *cmacHash) BlockSize() int {
return h.ciph.BlockSize()
}
// New returns an AES-CMAC hash using the supplied key. The key must be 16, 24,
// or 32 bytes long.
func New(key []byte) (hash.Hash, error) {
switch len(key) {
case 16, 24, 32:
default:
return nil, fmt.Errorf("AES-CMAC requires a 16-, 24-, or 32-byte key.")
}
// Create a cipher.
ciph, err := aes.NewCipher(key)
if err != nil {
return nil, fmt.Errorf("aes.NewCipher: %v", err)
}
// Set up the hash object.
h := &cmacHash{ciph: ciph}
h.k1, h.k2 = generateSubkeys(ciph)
h.Reset()
return h, nil
}

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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build 386 arm,!arm64 mips mipsle
package cmac
import (
"log"
"unsafe"
)
// XOR the blockSize bytes starting at a and b, writing the result over dst.
func xorBlock(
dstPtr unsafe.Pointer,
aPtr unsafe.Pointer,
bPtr unsafe.Pointer) {
// Check assumptions. (These are compile-time constants, so this should
// compile out.)
const wordSize = unsafe.Sizeof(uintptr(0))
if blockSize != 4*wordSize {
log.Panicf("%d %d", blockSize, wordSize)
}
// Convert.
a := (*[4]uintptr)(aPtr)
b := (*[4]uintptr)(bPtr)
dst := (*[4]uintptr)(dstPtr)
// Compute.
dst[0] = a[0] ^ b[0]
dst[1] = a[1] ^ b[1]
dst[2] = a[2] ^ b[2]
dst[3] = a[3] ^ b[3]
}

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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build amd64 arm64 ppc64 ppc64le s390x mips64 mips64le
// This code assumes that it's safe to perform unaligned word-sized loads. This is safe on:
// - arm64 per http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0024a/ch05s01s02.html
// - Section "5.5.8 Alignment Interrupt" of PowerPC Operating Environment Architecture Book III Version 2.02
// (the first PowerPC ISA version to include 64-bit), available from
// http://www.ibm.com/developerworks/systems/library/es-archguide-v2.html does not permit fixed-point loads
// or stores to generate exceptions on unaligned access
// - IBM mainframe's have allowed unaligned accesses since the System/370 arrived in 1970
// - On mips unaligned accesses are fixed up by the kernel per https://www.linux-mips.org/wiki/Alignment
// so performance might be quite bad but it will work.
package cmac
import (
"log"
"unsafe"
)
// XOR the blockSize bytes starting at a and b, writing the result over dst.
func xorBlock(
dstPtr unsafe.Pointer,
aPtr unsafe.Pointer,
bPtr unsafe.Pointer) {
// Check assumptions. (These are compile-time constants, so this should
// compile out.)
const wordSize = unsafe.Sizeof(uintptr(0))
if blockSize != 2*wordSize {
log.Panicf("%d %d", blockSize, wordSize)
}
// Convert.
a := (*[2]uintptr)(aPtr)
b := (*[2]uintptr)(bPtr)
dst := (*[2]uintptr)(dstPtr)
// Compute.
dst[0] = a[0] ^ b[0]
dst[1] = a[1] ^ b[1]
}

65
app/libgocryptfs/gocryptfs_internal/jacobsa_crypto/cmac/subkey.go Normal file
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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmac
import (
"bytes"
"crypto/cipher"
"../common"
)
var subkeyZero []byte
var subkeyRb []byte
func init() {
subkeyZero = bytes.Repeat([]byte{0x00}, blockSize)
subkeyRb = append(bytes.Repeat([]byte{0x00}, blockSize-1), 0x87)
}
// Given the supplied cipher, whose block size must be 16 bytes, return two
// subkeys that can be used in MAC generation. See section 5.3 of NIST SP
// 800-38B. Note that the other NIST-approved block size of 8 bytes is not
// supported by this function.
func generateSubkeys(ciph cipher.Block) (k1 []byte, k2 []byte) {
if ciph.BlockSize() != blockSize {
panic("generateSubkeys requires a cipher with a block size of 16 bytes.")
}
// Step 1
l := make([]byte, blockSize)
ciph.Encrypt(l, subkeyZero)
// Step 2: Derive the first subkey.
if common.Msb(l) == 0 {
// TODO(jacobsa): Accept a destination buffer in ShiftLeft and then hoist
// the allocation in the else branch below.
k1 = common.ShiftLeft(l)
} else {
k1 = make([]byte, blockSize)
common.Xor(k1, common.ShiftLeft(l), subkeyRb)
}
// Step 3: Derive the second subkey.
if common.Msb(k1) == 0 {
k2 = common.ShiftLeft(k1)
} else {
k2 = make([]byte, blockSize)
common.Xor(k2, common.ShiftLeft(k1), subkeyRb)
}
return
}

18
app/libgocryptfs/gocryptfs_internal/jacobsa_crypto/common/doc.go Normal file
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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package common contains common implementation details of other packages, and
// should not be used directly.
package common

26
app/libgocryptfs/gocryptfs_internal/jacobsa_crypto/common/msb.go Normal file
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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package common
// Msb returns the most significant bit of the supplied data (which must be
// non-empty). This is the MSB(L) function of RFC 4493.
func Msb(buf []byte) uint8 {
if len(buf) == 0 {
panic("msb requires non-empty buffer.")
}
return buf[0] >> 7
}

36
app/libgocryptfs/gocryptfs_internal/jacobsa_crypto/common/pad_block.go Normal file
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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package common
import (
"crypto/aes"
)
// PadBlock pads a string of bytes less than 16 bytes long to a full block size
// by appending a one bit followed by zero bits. This is the padding function
// used in RFCs 4493 and 5297.
func PadBlock(block []byte) []byte {
blockLen := len(block)
if blockLen >= aes.BlockSize {
panic("PadBlock input must be less than 16 bytes.")
}
result := make([]byte, aes.BlockSize)
copy(result, block)
result[blockLen] = 0x80
return result
}

37
app/libgocryptfs/gocryptfs_internal/jacobsa_crypto/common/shiftleft.go Normal file
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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package common
// ShiftLeft shifts the binary string left by one bit, causing the
// most-signficant bit to disappear and a zero to be introduced at the right.
// This corresponds to the `x << 1` notation of RFC 4493.
func ShiftLeft(b []byte) []byte {
l := len(b)
if l == 0 {
panic("shiftLeft requires a non-empty buffer.")
}
output := make([]byte, l)
overflow := byte(0)
for i := int(l - 1); i >= 0; i-- {
output[i] = b[i] << 1
output[i] |= overflow
overflow = (b[i] & 0x80) >> 7
}
return output
}

33
app/libgocryptfs/gocryptfs_internal/jacobsa_crypto/common/xor.go Normal file
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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package common
import "log"
// Xor computes `a XOR b`, as defined by RFC 4493. dst, a, and b must all have
// the same length.
func Xor(dst []byte, a []byte, b []byte) {
// TODO(jacobsa): Consider making this a helper function with known sizes
// where it is most hot, then even trying to inline it entirely.
if len(dst) != len(a) || len(a) != len(b) {
log.Panicf("Bad buffer lengths: %d, %d, %d", len(dst), len(a), len(b))
}
for i, _ := range a {
dst[i] = a[i] ^ b[i]
}
}

48
app/libgocryptfs/gocryptfs_internal/jacobsa_crypto/siv/dbl.go Normal file
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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package siv
import (
"bytes"
"crypto/aes"
"../common"
)
var dblRb []byte
func init() {
dblRb = append(bytes.Repeat([]byte{0x00}, 15), 0x87)
}
// Given a 128-bit binary string, shift the string left by one bit and XOR the
// result with 0x00...87 if the bit shifted off was one. This is the dbl
// function of RFC 5297.
func dbl(b []byte) []byte {
if len(b) != aes.BlockSize {
panic("dbl requires a 16-byte buffer.")
}
shiftedOne := common.Msb(b) == 1
b = common.ShiftLeft(b)
if shiftedOne {
tmp := make([]byte, aes.BlockSize)
common.Xor(tmp, b, dblRb)
b = tmp
}
return b
}

103
app/libgocryptfs/gocryptfs_internal/jacobsa_crypto/siv/decrypt.go Normal file
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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package siv
import (
"crypto/aes"
"crypto/cipher"
"crypto/subtle"
"fmt"
)
// *NotAuthenticError is returned by Decrypt if the input is otherwise
// well-formed but the ciphertext doesn't check out as authentic. This could be
// due to an incorrect key, corrupted ciphertext, or incorrect/corrupted
// associated data.
type NotAuthenticError struct {
s string
}
func (e *NotAuthenticError) Error() string {
return e.s
}
// Given ciphertext previously generated by Encrypt and the key and associated
// data that were used when generating the ciphertext, return the original
// plaintext given to Encrypt. If the input is well-formed but the key is
// incorrect, return an instance of WrongKeyError.
func Decrypt(key, ciphertext []byte, associated [][]byte) ([]byte, error) {
keyLen := len(key)
associatedLen := len(associated)
// The first 16 bytes of the ciphertext are the SIV.
if len(ciphertext) < aes.BlockSize {
return nil, fmt.Errorf("Invalid ciphertext; length must be at least 16.")
}
v := ciphertext[0:aes.BlockSize]
c := ciphertext[aes.BlockSize:]
// Make sure the key length is legal.
switch keyLen {
case 32, 48, 64:
default:
return nil, fmt.Errorf("SIV requires a 32-, 48-, or 64-byte key.")
}
// Derive subkeys.
k1 := key[:keyLen/2]
k2 := key[keyLen/2:]
// Make sure the number of associated data is legal, per RFC 5297 section 7.
if associatedLen > 126 {
return nil, fmt.Errorf("len(associated) may be no more than 126.")
}
// Create a CTR cipher using a version of v with the 31st and 63rd bits
// zeroed out.
q := dup(v)
q[aes.BlockSize-4] &= 0x7f
q[aes.BlockSize-8] &= 0x7f
ciph, err := aes.NewCipher(k2)
if err != nil {
return nil, fmt.Errorf("aes.NewCipher: %v", err)
}
ctrCiph := cipher.NewCTR(ciph, q)
// Decrypt the ciphertext.
plaintext := make([]byte, len(c))
ctrCiph.XORKeyStream(plaintext, c)
// Verify the SIV.
s2vStrings := make([][]byte, associatedLen+1)
copy(s2vStrings, associated)
s2vStrings[associatedLen] = plaintext
t := s2v(k1, s2vStrings, nil)
if len(t) != aes.BlockSize {
panic(fmt.Sprintf("Unexpected output of S2V: %v", t))
}
if subtle.ConstantTimeCompare(t, v) != 1 {
return nil, &NotAuthenticError{
"Couldn't validate the authenticity of the ciphertext and " +
"associated data."}
}
return plaintext, nil
}

21
app/libgocryptfs/gocryptfs_internal/jacobsa_crypto/siv/doc.go Normal file
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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package siv implements the SIV (Synthetic Initialization Vector) mode of
// AES, as defined by RFC 5297.
//
// This mode offers the choice of deterministic authenticated encryption or
// nonce-based, misuse-resistant authenticated encryption.
package siv

124
app/libgocryptfs/gocryptfs_internal/jacobsa_crypto/siv/encrypt.go Normal file
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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package siv
import (
"crypto/aes"
"crypto/cipher"
"fmt"
)
func dup(d []byte) []byte {
result := make([]byte, len(d))
copy(result, d)
return result
}
// Given a key and plaintext, encrypt the plaintext using the SIV mode of AES,
// as defined by RFC 5297, append the result (including both the synthetic
// initialization vector and the ciphertext) to dst, and return the updated
// slice. The output can later be fed to Decrypt to recover the plaintext.
//
// In addition to confidentiality, this function also offers authenticity. That
// is, without the secret key an attacker is unable to construct a byte string
// that Decrypt will accept.
//
// The supplied key must be 32, 48, or 64 bytes long.
//
// The supplied associated data, up to 126 strings, is also authenticated,
// though it is not included in the ciphertext. The user must supply the same
// associated data to Decrypt in order for the Decrypt call to succeed. If no
// associated data is desired, pass an empty slice.
//
// If the same key, plaintext, and associated data are supplied to this
// function multiple times, the output is guaranteed to be identical. As per
// RFC 5297 section 3, you may use this function for nonce-based authenticated
// encryption by passing a nonce as the last associated data element.
func Encrypt(dst, key, plaintext []byte, associated [][]byte) ([]byte, error) {
keyLen := len(key)
associatedLen := len(associated)
// The output will consist of the current contents of dst, followed by the IV
// generated by s2v, followed by the ciphertext (which is the same size as
// the plaintext).
//
// Make sure dst is long enough, then carve it up.
var iv []byte
var ciphertext []byte
{
dstSize := len(dst)
dstAndIVSize := dstSize + s2vSize
outputSize := dstAndIVSize + len(plaintext)
if cap(dst) < outputSize {
tmp := make([]byte, dstSize, outputSize+outputSize/4)
copy(tmp, dst)
dst = tmp
}
dst = dst[:outputSize]
iv = dst[dstSize:dstAndIVSize]
ciphertext = dst[dstAndIVSize:outputSize]
}
// Make sure the key length is legal.
switch keyLen {
case 32, 48, 64:
default:
return nil, fmt.Errorf("SIV requires a 32-, 48-, or 64-byte key.")
}
// Make sure the number of associated data is legal, per RFC 5297 section 7.
if associatedLen > 126 {
return nil, fmt.Errorf("len(associated) may be no more than 126.")
}
// Derive subkeys.
k1 := key[:keyLen/2]
k2 := key[keyLen/2:]
// Call S2V to derive the synthetic initialization vector. Use the ciphertext
// output buffer as scratch space, since it's the same length as the final
// string.
s2vStrings := make([][]byte, associatedLen+1)
copy(s2vStrings, associated)
s2vStrings[associatedLen] = plaintext
v := s2v(k1, s2vStrings, ciphertext)
if len(v) != len(iv) {
panic(fmt.Sprintf("Unexpected vector: %v", v))
}
copy(iv, v)
// Create a CTR cipher using a version of v with the 31st and 63rd bits
// zeroed out.
q := dup(v)
q[aes.BlockSize-4] &= 0x7f
q[aes.BlockSize-8] &= 0x7f
ciph, err := aes.NewCipher(k2)
if err != nil {
return nil, fmt.Errorf("aes.NewCipher: %v", err)
}
ctrCiph := cipher.NewCTR(ciph, q)
// Fill in the ciphertext.
ctrCiph.XORKeyStream(ciphertext, plaintext)
return dst, nil
}

98
app/libgocryptfs/gocryptfs_internal/jacobsa_crypto/siv/s2v.go Normal file
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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package siv
import (
"bytes"
"crypto/aes"
"fmt"
"../cmac"
"../common"
)
var s2vZero []byte
func init() {
s2vZero = bytes.Repeat([]byte{0x00}, aes.BlockSize)
}
// The output size of the s2v function.
const s2vSize = cmac.Size
// Run the S2V "string to vector" function of RFC 5297 using the input key and
// string vector, which must be non-empty. (RFC 5297 defines S2V to handle the
// empty vector case, but it is never used that way by higher-level functions.)
//
// If provided, the supplied scatch space will be used to avoid an allocation.
// It should be (but is not required to be) as large as the last element of
// strings.
//
// The result is guaranteed to be of length s2vSize.
func s2v(key []byte, strings [][]byte, scratch []byte) []byte {
numStrings := len(strings)
if numStrings == 0 {
panic("strings vector must be non-empty.")
}
// Create a CMAC hash.
h, err := cmac.New(key)
if err != nil {
panic(fmt.Sprintf("cmac.New: %v", err))
}
// Initialize.
if _, err := h.Write(s2vZero); err != nil {
panic(fmt.Sprintf("h.Write: %v", err))
}
d := h.Sum([]byte{})
h.Reset()
// Handle all strings but the last.
for i := 0; i < numStrings-1; i++ {
if _, err := h.Write(strings[i]); err != nil {
panic(fmt.Sprintf("h.Write: %v", err))
}
common.Xor(d, dbl(d), h.Sum([]byte{}))
h.Reset()
}
// Handle the last string.
lastString := strings[numStrings-1]
var t []byte
if len(lastString) >= aes.BlockSize {
// Make an output buffer the length of lastString.
if cap(scratch) >= len(lastString) {
t = scratch[:len(lastString)]
} else {
t = make([]byte, len(lastString))
}
// XOR d on the end of lastString.
xorend(t, lastString, d)
} else {
t = make([]byte, aes.BlockSize)
common.Xor(t, dbl(d), common.PadBlock(lastString))
}
if _, err := h.Write(t); err != nil {
panic(fmt.Sprintf("h.Write: %v", err))
}
return h.Sum([]byte{})
}

44
app/libgocryptfs/gocryptfs_internal/jacobsa_crypto/siv/xorend.go Normal file
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// Copyright 2012 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package siv
import (
"log"
"../common"
)
// The xorend operator of RFC 5297.
//
// Given strings A and B with len(A) >= len(B), let D be len(A) - len(B). Write
// A[:D] followed by xor(A[D:], B) into dst. In other words, xor B over the
// rightmost end of A and write the result into dst.
func xorend(dst, a, b []byte) {
aLen := len(a)
bLen := len(b)
dstLen := len(dst)
if dstLen < aLen || aLen < bLen {
log.Panicf("Bad buffer lengths: %d, %d, %d", dstLen, aLen, bLen)
}
// Copy the left part.
difference := aLen - bLen
copy(dst, a[:difference])
// XOR in the right part.
common.Xor(dst[difference:difference+bLen], a[difference:], b)
}

119
app/libgocryptfs/gocryptfs_internal/nametransform/diriv.go Normal file
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package nametransform
import (
"bytes"
"fmt"
"io"
"os"
"path/filepath"
"syscall"
"../cryptocore"
"../../rewrites/syscallcompat"
)
const (
// DirIVLen is identical to AES block size
DirIVLen = 16
// DirIVFilename is the filename used to store directory IV.
// Exported because we have to ignore this name in directory listing.
DirIVFilename = "gocryptfs.diriv"
)
// ReadDirIVAt reads "gocryptfs.diriv" from the directory that is opened as "dirfd".
// Using the dirfd makes it immune to concurrent renames of the directory.
func ReadDirIVAt(dirfd int) (iv []byte, err error) {
fdRaw, err := syscallcompat.Openat(dirfd, DirIVFilename,
syscall.O_RDONLY|syscall.O_NOFOLLOW, 0)
if err != nil {
return nil, err
}
fd := os.NewFile(uintptr(fdRaw), DirIVFilename)
defer fd.Close()
return fdReadDirIV(fd)
}
// allZeroDirIV is preallocated to quickly check if the data read from disk is all zero
var allZeroDirIV = make([]byte, DirIVLen)
// fdReadDirIV reads and verifies the DirIV from an opened gocryptfs.diriv file.
func fdReadDirIV(fd *os.File) (iv []byte, err error) {
// We want to detect if the file is bigger than DirIVLen, so
// make the buffer 1 byte bigger than necessary.
iv = make([]byte, DirIVLen+1)
n, err := fd.Read(iv)
if err != nil && err != io.EOF {
return nil, fmt.Errorf("read failed: %v", err)
}
iv = iv[0:n]
if len(iv) != DirIVLen {
return nil, fmt.Errorf("wanted %d bytes, got %d", DirIVLen, len(iv))
}
if bytes.Equal(iv, allZeroDirIV) {
return nil, fmt.Errorf("diriv is all-zero")
}
return iv, nil
}
// WriteDirIVAt - create a new gocryptfs.diriv file in the directory opened at
// "dirfd". On error we try to delete the incomplete file.
// This function is exported because it is used from fusefrontend, main,
// and also the automated tests.
func WriteDirIVAt(dirfd int) error {
// It makes sense to have the diriv files group-readable so the FS can
// be mounted from several users from a network drive (see
// https://github.com/rfjakob/gocryptfs/issues/387 ).
//
// Note that gocryptfs.conf is still created with 0400 permissions so the
// owner must explicitly chmod it to permit access.
const dirivPerms = 0440
iv := cryptocore.RandBytes(DirIVLen)
// 0400 permissions: gocryptfs.diriv should never be modified after creation.
// Don't use "ioutil.WriteFile", it causes trouble on NFS:
// https://github.com/rfjakob/gocryptfs/commit/7d38f80a78644c8ec4900cc990bfb894387112ed
fd, err := syscallcompat.Openat(dirfd, DirIVFilename, os.O_WRONLY|os.O_CREATE|os.O_EXCL, dirivPerms)
if err != nil {
return err
}
// Wrap the fd in an os.File - we need the write retry logic.
f := os.NewFile(uintptr(fd), DirIVFilename)
_, err = f.Write(iv)
if err != nil {
f.Close()
// Delete incomplete gocryptfs.diriv file
syscallcompat.Unlinkat(dirfd, DirIVFilename, 0)
return err
}
err = f.Close()
if err != nil {
// Delete incomplete gocryptfs.diriv file
syscallcompat.Unlinkat(dirfd, DirIVFilename, 0)
return err
}
return nil
}
// encryptAndHashName encrypts "name" and hashes it to a longname if it is
// too long.
// Returns ENAMETOOLONG if "name" is longer than 255 bytes.
func (be *NameTransform) EncryptAndHashName(name string, iv []byte) (string, error) {
// Prevent the user from creating files longer than 255 chars.
if len(name) > NameMax {
return "", syscall.ENAMETOOLONG
}
cName := be.EncryptName(name, iv)
if be.longNames && len(cName) > NameMax {
return be.HashLongName(cName), nil
}
return cName, nil
}
// Dir is like filepath.Dir but returns "" instead of ".".
func Dir(path string) string {
d := filepath.Dir(path)
if d == "." {
return ""
}
return d
}

153
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package nametransform
import (
"crypto/sha256"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"syscall"
"../../rewrites/syscallcompat"
)
const (
// LongNameSuffix is the suffix used for files with long names.
// Files with long names are stored in two files:
// gocryptfs.longname.[sha256] <--- File content, prefix = gocryptfs.longname.
// gocryptfs.longname.[sha256].name <--- File name, suffix = .name
LongNameSuffix = ".name"
longNamePrefix = "gocryptfs.longname."
)
// HashLongName - take the hash of a long string "name" and return
// "gocryptfs.longname.[sha256]"
//
// This function does not do any I/O.
func (n *NameTransform) HashLongName(name string) string {
hashBin := sha256.Sum256([]byte(name))
hashBase64 := n.B64.EncodeToString(hashBin[:])
return longNamePrefix + hashBase64
}
// Values returned by IsLongName
const (
// LongNameContent is the file that stores the file content.
// Example: gocryptfs.longname.URrM8kgxTKYMgCk4hKk7RO9Lcfr30XQof4L_5bD9Iro=
LongNameContent = iota
// LongNameFilename is the file that stores the full encrypted filename.
// Example: gocryptfs.longname.URrM8kgxTKYMgCk4hKk7RO9Lcfr30XQof4L_5bD9Iro=.name
LongNameFilename = iota
// LongNameNone is used when the file does not have a long name.
// Example: i1bpTaVLZq7sRNA9mL_2Ig==
LongNameNone = iota
)
// NameType - detect if cName is
// gocryptfs.longname.[sha256] ........ LongNameContent (content of a long name file)
// gocryptfs.longname.[sha256].name .... LongNameFilename (full file name of a long name file)
// else ................................ LongNameNone (normal file)
//
// This function does not do any I/O.
func NameType(cName string) int {
if !strings.HasPrefix(cName, longNamePrefix) {
return LongNameNone
}
if strings.HasSuffix(cName, LongNameSuffix) {
return LongNameFilename
}
return LongNameContent
}
// IsLongContent returns true if "cName" is the content store of a long name
// file (looks like "gocryptfs.longname.[sha256]").
//
// This function does not do any I/O.
func IsLongContent(cName string) bool {
return NameType(cName) == LongNameContent
}
// RemoveLongNameSuffix removes the ".name" suffix from cName, returning the corresponding
// content file name.
// No check is made if cName actually is a LongNameFilename.
func RemoveLongNameSuffix(cName string) string {
return cName[:len(cName)-len(LongNameSuffix)]
}
// ReadLongName - read cName + ".name" from the directory opened as dirfd.
//
// Symlink-safe through Openat().
func ReadLongNameAt(dirfd int, cName string) (string, error) {
cName += LongNameSuffix
var f *os.File
{
fd, err := syscallcompat.Openat(dirfd, cName, syscall.O_RDONLY|syscall.O_NOFOLLOW, 0)
if err != nil {
return "", err
}
f = os.NewFile(uintptr(fd), "")
// fd runs out of scope here
}
defer f.Close()
// 256 (=255 padded to 16) bytes base64-encoded take 344 bytes: "AAAAAAA...AAA=="
lim := 344
// Allocate a bigger buffer so we see whether the file is too big
buf := make([]byte, lim+1)
n, err := f.ReadAt(buf, 0)
if err != nil && err != io.EOF {
return "", err
}
if n == 0 {
return "", fmt.Errorf("ReadLongName: empty file")
}
if n > lim {
return "", fmt.Errorf("ReadLongName: size=%d > limit=%d", n, lim)
}
return string(buf[0:n]), nil
}
// DeleteLongName deletes "hashName.name" in the directory opened at "dirfd".
//
// This function is symlink-safe through the use of Unlinkat().
func DeleteLongNameAt(dirfd int, hashName string) error {
return syscallcompat.Unlinkat(dirfd, hashName+LongNameSuffix, 0)
}
// WriteLongName encrypts plainName and writes it into "hashName.name".
// For the convenience of the caller, plainName may also be a path and will be
// Base()named internally.
//
// This function is symlink-safe through the use of Openat().
func (n *NameTransform) WriteLongNameAt(dirfd int, hashName string, plainName string) (err error) {
plainName = filepath.Base(plainName)
// Encrypt the basename
dirIV, err := ReadDirIVAt(dirfd)
if err != nil {
return err
}
cName := n.EncryptName(plainName, dirIV)
// Write the encrypted name into hashName.name
fdRaw, err := syscallcompat.Openat(dirfd, hashName+LongNameSuffix,
syscall.O_WRONLY|syscall.O_CREAT|syscall.O_EXCL, 0400)
if err != nil {
return err
}
fd := os.NewFile(uintptr(fdRaw), hashName+LongNameSuffix)
_, err = fd.Write([]byte(cName))
if err != nil {
fd.Close()
// Delete incomplete longname file
syscallcompat.Unlinkat(dirfd, hashName+LongNameSuffix, 0)
return err
}
err = fd.Close()
if err != nil {
// Delete incomplete longname file
syscallcompat.Unlinkat(dirfd, hashName+LongNameSuffix, 0)
return err
}
return nil
}

133
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// Package nametransform encrypts and decrypts filenames.
package nametransform
import (
"bytes"
"crypto/aes"
"encoding/base64"
"path/filepath"
"syscall"
"../eme"
)
const (
// Like ext4, we allow at most 255 bytes for a file name.
NameMax = 255
)
// NameTransformer is an interface used to transform filenames.
type NameTransformer interface {
DecryptName(cipherName string, iv []byte) (string, error)
EncryptName(plainName string, iv []byte) string
EncryptAndHashName(name string, iv []byte) (string, error)
HashLongName(name string) string
WriteLongNameAt(dirfd int, hashName string, plainName string) error
B64EncodeToString(src []byte) string
B64DecodeString(s string) ([]byte, error)
}
// NameTransform is used to transform filenames.
type NameTransform struct {
emeCipher *eme.EMECipher
longNames bool
// B64 = either base64.URLEncoding or base64.RawURLEncoding, depending
// on the Raw64 feature flag
B64 *base64.Encoding
// Patterns to bypass decryption
BadnamePatterns []string
}
// New returns a new NameTransform instance.
func New(e *eme.EMECipher, longNames bool, raw64 bool) *NameTransform {
b64 := base64.URLEncoding
if raw64 {
b64 = base64.RawURLEncoding
}
return &NameTransform{
emeCipher: e,
longNames: longNames,
B64: b64,
}
}
// DecryptName calls decryptName to try and decrypt a base64-encoded encrypted
// filename "cipherName", and failing that checks if it can be bypassed
func (n *NameTransform) DecryptName(cipherName string, iv []byte) (string, error) {
res, err := n.decryptName(cipherName, iv)
if err != nil {
for _, pattern := range n.BadnamePatterns {
match, err := filepath.Match(pattern, cipherName)
if err == nil && match { // Pattern should have been validated already
// Find longest decryptable substring
// At least 16 bytes due to AES --> at least 22 characters in base64
nameMin := n.B64.EncodedLen(aes.BlockSize)
for charpos := len(cipherName) - 1; charpos >= nameMin; charpos-- {
res, err = n.decryptName(cipherName[:charpos], iv)
if err == nil {
return res + cipherName[charpos:] + " GOCRYPTFS_BAD_NAME", nil
}
}
return cipherName + " GOCRYPTFS_BAD_NAME", nil
}
}
}
return res, err
}
// decryptName decrypts a base64-encoded encrypted filename "cipherName" using the
// initialization vector "iv".
func (n *NameTransform) decryptName(cipherName string, iv []byte) (string, error) {
bin, err := n.B64.DecodeString(cipherName)
if err != nil {
return "", err
}
if len(bin) == 0 {
return "", syscall.EBADMSG
}
if len(bin)%aes.BlockSize != 0 {
return "", syscall.EBADMSG
}
bin = n.emeCipher.Decrypt(iv, bin)
bin, err = unPad16(bin)
if err != nil {
// unPad16 returns detailed errors including the position of the
// incorrect bytes. Kill the padding oracle by lumping everything into
// a generic error.
return "", syscall.EBADMSG
}
// A name can never contain a null byte or "/". Make sure we never return those
// to the kernel, even when we read a corrupted (or fuzzed) filesystem.
if bytes.Contains(bin, []byte{0}) || bytes.Contains(bin, []byte("/")) {
return "", syscall.EBADMSG
}
// The name should never be "." or "..".
if bytes.Equal(bin, []byte(".")) || bytes.Equal(bin, []byte("..")) {
return "", syscall.EBADMSG
}
plain := string(bin)
return plain, err
}
// EncryptName encrypts "plainName", returns a base64-encoded "cipherName64",
// encrypted using EME (https://github.com/rfjakob/eme).
//
// This function is exported because in some cases, fusefrontend needs access
// to the full (not hashed) name if longname is used.
func (n *NameTransform) EncryptName(plainName string, iv []byte) (cipherName64 string) {
bin := []byte(plainName)
bin = pad16(bin)
bin = n.emeCipher.Encrypt(iv, bin)
cipherName64 = n.B64.EncodeToString(bin)
return cipherName64
}
// B64EncodeToString returns a Base64-encoded string
func (n *NameTransform) B64EncodeToString(src []byte) string {
return n.B64.EncodeToString(src)
}
// B64DecodeString decodes a Base64-encoded string
func (n *NameTransform) B64DecodeString(s string) ([]byte, error) {
return n.B64.DecodeString(s)
}

64
app/libgocryptfs/gocryptfs_internal/nametransform/pad16.go Normal file
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package nametransform
import (
"crypto/aes"
"errors"
"fmt"
"log"
)
// pad16 - pad data to AES block size (=16 byte) using standard PKCS#7 padding
// https://tools.ietf.org/html/rfc5652#section-6.3
func pad16(orig []byte) (padded []byte) {
oldLen := len(orig)
if oldLen == 0 {
log.Panic("Padding zero-length string makes no sense")
}
padLen := aes.BlockSize - oldLen%aes.BlockSize
if padLen == 0 {
padLen = aes.BlockSize
}
newLen := oldLen + padLen
padded = make([]byte, newLen)
copy(padded, orig)
padByte := byte(padLen)
for i := oldLen; i < newLen; i++ {
padded[i] = padByte
}
return padded
}
// unPad16 - remove padding
func unPad16(padded []byte) ([]byte, error) {
oldLen := len(padded)
if oldLen == 0 {
return nil, errors.New("Empty input")
}
if oldLen%aes.BlockSize != 0 {
return nil, errors.New("Unaligned size")
}
// The last byte is always a padding byte
padByte := padded[oldLen-1]
// The padding byte's value is the padding length
padLen := int(padByte)
// Padding must be at least 1 byte
if padLen == 0 {
return nil, errors.New("Padding cannot be zero-length")
}
// Padding more than 16 bytes make no sense
if padLen > aes.BlockSize {
return nil, fmt.Errorf("Padding too long, padLen=%d > 16", padLen)
}
// Padding cannot be as long as (or longer than) the whole string,
if padLen >= oldLen {
return nil, fmt.Errorf("Padding too long, oldLen=%d >= padLen=%d", oldLen, padLen)
}
// All padding bytes must be identical
for i := oldLen - padLen; i < oldLen; i++ {
if padded[i] != padByte {
return nil, fmt.Errorf("Padding byte at i=%d is invalid", i)
}
}
newLen := oldLen - padLen
return padded[0:newLen], nil
}

7
app/libgocryptfs/gocryptfs_internal/siv_aead/benchmark.bash Executable file
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#!/bin/bash
set -eu
cd "$(dirname "$0")"
../stupidgcm/benchmark.bash

97
app/libgocryptfs/gocryptfs_internal/siv_aead/siv_aead.go Normal file
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// Package siv_aead wraps the functions provided by siv
// in a crypto.AEAD interface.
package siv_aead
import (
"crypto/cipher"
"log"
"../jacobsa_crypto/siv"
)
type sivAead struct {
key []byte
}
var _ cipher.AEAD = &sivAead{}
const (
// KeyLen is the required key length. The SIV algorithm supports other lengths,
// but we only support 64.
KeyLen = 64
)
// New returns a new cipher.AEAD implementation.
func New(key []byte) cipher.AEAD {
if len(key) != KeyLen {
// SIV supports 32, 48 or 64-byte keys, but in gocryptfs we
// exclusively use 64.
log.Panicf("Key must be %d byte long (you passed %d)", KeyLen, len(key))
}
return new2(key)
}
// Same as "New" without the 64-byte restriction.
func new2(keyIn []byte) cipher.AEAD {
// Create a private copy so the caller can zero the one he owns
key := append([]byte{}, keyIn...)
return &sivAead{
key: key,
}
}
func (s *sivAead) NonceSize() int {
// SIV supports any nonce size, but in gocryptfs we exclusively use 16.
return 16
}
func (s *sivAead) Overhead() int {
return 16
}
// Seal encrypts "in" using "nonce" and "authData" and appends the result to "dst"
func (s *sivAead) Seal(dst, nonce, plaintext, authData []byte) []byte {
if len(nonce) != 16 {
// SIV supports any nonce size, but in gocryptfs we exclusively use 16.
log.Panic("nonce must be 16 bytes long")
}
if len(s.key) == 0 {
log.Panic("Key has been wiped?")
}
// https://github.com/jacobsa/crypto/blob/master/siv/encrypt.go#L48:
// As per RFC 5297 section 3, you may use this function for nonce-based
// authenticated encryption by passing a nonce as the last associated
// data element.
associated := [][]byte{authData, nonce}
out, err := siv.Encrypt(dst, s.key, plaintext, associated)
if err != nil {
log.Panic(err)
}
return out
}
// Open decrypts "in" using "nonce" and "authData" and appends the result to "dst"
func (s *sivAead) Open(dst, nonce, ciphertext, authData []byte) ([]byte, error) {
if len(nonce) != 16 {
// SIV supports any nonce size, but in gocryptfs we exclusively use 16.
log.Panic("nonce must be 16 bytes long")
}
if len(s.key) == 0 {
log.Panic("Key has been wiped?")
}
associated := [][]byte{authData, nonce}
dec, err := siv.Decrypt(s.key, ciphertext, associated)
return append(dst, dec...), err
}
// Wipe tries to wipe the AES key from memory by overwriting it with zeros
// and setting the reference to nil.
//
// This is not bulletproof due to possible GC copies, but
// still raises to bar for extracting the key.
func (s *sivAead) Wipe() {
for i := range s.key {
s.key[i] = 0
}
s.key = nil
}

8
app/libgocryptfs/gocryptfs_internal/stupidgcm/autherr.go Normal file
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package stupidgcm
import (
"fmt"
)
// ErrAuth is returned when the message authentication fails
var ErrAuth = fmt.Errorf("stupidgcm: message authentication failed")

3
app/libgocryptfs/gocryptfs_internal/stupidgcm/benchmark.bash Executable file
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#!/bin/bash
exec ../speed/benchmark.bash

28
app/libgocryptfs/gocryptfs_internal/stupidgcm/locking.go Normal file
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// +build !without_openssl
package stupidgcm
// In general, OpenSSL is only threadsafe if you provide a locking function
// through CRYPTO_set_locking_callback. However, the GCM operations that
// stupidgcm uses never call that function. Additionally, the manual locking
// has been removed completely in openssl 1.1.0.
/*
#include <openssl/crypto.h>
#include <stdio.h>
static void dummy_callback(int mode, int n, const char *file, int line) {
printf("stupidgcm: thread locking is not implemented and should not be "
"needed. Please upgrade openssl.\n");
// panic
__builtin_trap();
}
static void set_dummy_callback() {
CRYPTO_set_locking_callback(dummy_callback);
}
*/
import "C"
func init() {
C.set_dummy_callback()
}

28
app/libgocryptfs/gocryptfs_internal/stupidgcm/prefer.go Normal file
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package stupidgcm
import (
"golang.org/x/sys/cpu"
)
// PreferOpenSSL tells us if OpenSSL is faster than Go GCM on this machine.
//
// Go GCM is only faster if the CPU either:
//
// 1) Is X86_64 && has AES instructions && Go is v1.6 or higher
// 2) Is ARM64 && has AES instructions && Go is v1.11 or higher
// (commit https://github.com/golang/go/commit/4f1f503373cda7160392be94e3849b0c9b9ebbda)
//
// See https://github.com/rfjakob/gocryptfs/wiki/CPU-Benchmarks
// for benchmarks.
func PreferOpenSSL() bool {
if BuiltWithoutOpenssl {
return false
}
// Safe to call on other architectures - will just read false.
if cpu.X86.HasAES || cpu.ARM64.HasAES {
// Go stdlib is probably faster
return false
}
// Openssl is probably faster
return true
}

250
app/libgocryptfs/gocryptfs_internal/stupidgcm/stupidgcm.go Normal file
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// +build !without_openssl
// Package stupidgcm is a thin wrapper for OpenSSL's GCM encryption and
// decryption functions. It only support 32-byte keys and 16-bit IVs.
package stupidgcm
//#include <openssl/err.h>
// #include <openssl/evp.h>
// #cgo pkg-config: libcrypto
import "C"
import (
"crypto/cipher"
"fmt"
"log"
"unsafe"
)
const (
// BuiltWithoutOpenssl indicates if openssl been disabled at compile-time
BuiltWithoutOpenssl = false
keyLen = 32
ivLen = 16
tagLen = 16
)
// StupidGCM implements the cipher.AEAD interface
type StupidGCM struct {
key []byte
forceDecode bool
}
// Verify that we satisfy the cipher.AEAD interface
var _ cipher.AEAD = &StupidGCM{}
// New returns a new cipher.AEAD implementation..
func New(keyIn []byte, forceDecode bool) cipher.AEAD {
if len(keyIn) != keyLen {
log.Panicf("Only %d-byte keys are supported", keyLen)
}
// Create a private copy of the key
key := append([]byte{}, keyIn...)
return &StupidGCM{key: key, forceDecode: forceDecode}
}
// NonceSize returns the required size of the nonce / IV.
func (g *StupidGCM) NonceSize() int {
return ivLen
}
// Overhead returns the number of bytes that are added for authentication.
func (g *StupidGCM) Overhead() int {
return tagLen
}
// Seal encrypts "in" using "iv" and "authData" and append the result to "dst"
func (g *StupidGCM) Seal(dst, iv, in, authData []byte) []byte {
if len(iv) != ivLen {
log.Panicf("Only %d-byte IVs are supported", ivLen)
}
if len(in) == 0 {
log.Panic("Zero-length input data is not supported")
}
if len(g.key) != keyLen {
log.Panicf("Wrong key length: %d. Key has been wiped?", len(g.key))
}
// If the "dst" slice is large enough we can use it as our output buffer
outLen := len(in) + tagLen
var buf []byte
inplace := false
if cap(dst)-len(dst) >= outLen {
inplace = true
buf = dst[len(dst) : len(dst)+outLen]
} else {
buf = make([]byte, outLen)
}
// https://wiki.openssl.org/index.php/EVP_Authenticated_Encryption_and_Decryption#Authenticated_Encryption_using_GCM_mode
// Create scratch space "context"
ctx := C.EVP_CIPHER_CTX_new()
if ctx == nil {
log.Panic("EVP_CIPHER_CTX_new failed")
}
// Set cipher to AES-256
if C.EVP_EncryptInit_ex(ctx, C.EVP_aes_256_gcm(), nil, nil, nil) != 1 {
log.Panic("EVP_EncryptInit_ex I failed")
}
// Use 16-byte IV
if C.EVP_CIPHER_CTX_ctrl(ctx, C.EVP_CTRL_GCM_SET_IVLEN, ivLen, nil) != 1 {
log.Panic("EVP_CIPHER_CTX_ctrl EVP_CTRL_GCM_SET_IVLEN failed")
}
// Set key and IV
if C.EVP_EncryptInit_ex(ctx, nil, nil, (*C.uchar)(&g.key[0]), (*C.uchar)(&iv[0])) != 1 {
log.Panic("EVP_EncryptInit_ex II failed")
}
// Provide authentication data
var resultLen C.int
if C.EVP_EncryptUpdate(ctx, nil, &resultLen, (*C.uchar)(&authData[0]), C.int(len(authData))) != 1 {
log.Panic("EVP_EncryptUpdate authData failed")
}
if int(resultLen) != len(authData) {
log.Panicf("Unexpected length %d", resultLen)
}
// Encrypt "in" into "buf"
if C.EVP_EncryptUpdate(ctx, (*C.uchar)(&buf[0]), &resultLen, (*C.uchar)(&in[0]), C.int(len(in))) != 1 {
log.Panic("EVP_EncryptUpdate failed")
}
if int(resultLen) != len(in) {
log.Panicf("Unexpected length %d", resultLen)
}
// Finalise encryption
// Because GCM is a stream encryption, this will not write out any data.
dummy := make([]byte, 16)
if C.EVP_EncryptFinal_ex(ctx, (*C.uchar)(&dummy[0]), &resultLen) != 1 {
log.Panic("EVP_EncryptFinal_ex failed")
}
if resultLen != 0 {
log.Panicf("Unexpected length %d", resultLen)
}
// Get GMAC tag and append it to the ciphertext in "buf"
if C.EVP_CIPHER_CTX_ctrl(ctx, C.EVP_CTRL_GCM_GET_TAG, tagLen, (unsafe.Pointer)(&buf[len(in)])) != 1 {
log.Panic("EVP_CIPHER_CTX_ctrl EVP_CTRL_GCM_GET_TAG failed")
}
// Free scratch space
C.EVP_CIPHER_CTX_free(ctx)
if inplace {
return dst[:len(dst)+outLen]
}
return append(dst, buf...)
}
// Open decrypts "in" using "iv" and "authData" and append the result to "dst"
func (g *StupidGCM) Open(dst, iv, in, authData []byte) ([]byte, error) {
if len(iv) != ivLen {
log.Panicf("Only %d-byte IVs are supported", ivLen)
}
if len(g.key) != keyLen {
log.Panicf("Wrong key length: %d. Key has been wiped?", len(g.key))
}
if len(in) <= tagLen {
return nil, fmt.Errorf("stupidgcm: input data too short (%d bytes)", len(in))
}
// If the "dst" slice is large enough we can use it as our output buffer
outLen := len(in) - tagLen
var buf []byte
inplace := false
if cap(dst)-len(dst) >= outLen {
inplace = true
buf = dst[len(dst) : len(dst)+outLen]
} else {
buf = make([]byte, len(in)-tagLen)
}
ciphertext := in[:len(in)-tagLen]
tag := in[len(in)-tagLen:]
// https://wiki.openssl.org/index.php/EVP_Authenticated_Encryption_and_Decryption#Authenticated_Encryption_using_GCM_mode
// Create scratch space "context"
ctx := C.EVP_CIPHER_CTX_new()
if ctx == nil {
log.Panic("EVP_CIPHER_CTX_new failed")
}
// Set cipher to AES-256
if C.EVP_DecryptInit_ex(ctx, C.EVP_aes_256_gcm(), nil, nil, nil) != 1 {
log.Panic("EVP_DecryptInit_ex I failed")
}
// Use 16-byte IV
if C.EVP_CIPHER_CTX_ctrl(ctx, C.EVP_CTRL_GCM_SET_IVLEN, ivLen, nil) != 1 {
log.Panic("EVP_CIPHER_CTX_ctrl EVP_CTRL_GCM_SET_IVLEN failed")
}
// Set key and IV
if C.EVP_DecryptInit_ex(ctx, nil, nil, (*C.uchar)(&g.key[0]), (*C.uchar)(&iv[0])) != 1 {
log.Panic("EVP_DecryptInit_ex II failed")
}
// Set expected GMAC tag
if C.EVP_CIPHER_CTX_ctrl(ctx, C.EVP_CTRL_GCM_SET_TAG, tagLen, (unsafe.Pointer)(&tag[0])) != 1 {
log.Panic("EVP_CIPHER_CTX_ctrl failed")
}
// Provide authentication data
var resultLen C.int
if C.EVP_DecryptUpdate(ctx, nil, &resultLen, (*C.uchar)(&authData[0]), C.int(len(authData))) != 1 {
log.Panic("EVP_DecryptUpdate authData failed")
}
if int(resultLen) != len(authData) {
log.Panicf("Unexpected length %d", resultLen)
}
// Decrypt "ciphertext" into "buf"
if C.EVP_DecryptUpdate(ctx, (*C.uchar)(&buf[0]), &resultLen, (*C.uchar)(&ciphertext[0]), C.int(len(ciphertext))) != 1 {
log.Panic("EVP_DecryptUpdate failed")
}
if int(resultLen) != len(ciphertext) {
log.Panicf("Unexpected length %d", resultLen)
}
// Check GMAC
dummy := make([]byte, 16)
res := C.EVP_DecryptFinal_ex(ctx, (*C.uchar)(&dummy[0]), &resultLen)
if resultLen != 0 {
log.Panicf("Unexpected length %d", resultLen)
}
// Free scratch space
C.EVP_CIPHER_CTX_free(ctx)
if res != 1 {
// The error code must always be checked by the calling function, because the decrypted buffer
// may contain corrupted data that we are returning in case the user forced reads
if g.forceDecode == true {
return append(dst, buf...), ErrAuth
}
return nil, ErrAuth
}
if inplace {
return dst[:len(dst)+outLen], nil
}
return append(dst, buf...), nil
}
// Wipe tries to wipe the AES key from memory by overwriting it with zeros
// and setting the reference to nil.
//
// This is not bulletproof due to possible GC copies, but
// still raises to bar for extracting the key.
func (g *StupidGCM) Wipe() {
for i := range g.key {
g.key[i] = 0
}
g.key = nil
}

52
app/libgocryptfs/gocryptfs_internal/stupidgcm/without_openssl.go Normal file
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@ -0,0 +1,52 @@
// +build without_openssl
package stupidgcm
import (
"fmt"
"os"
"github.com/rfjakob/gocryptfs/internal/exitcodes"
)
type StupidGCM struct{}
const (
// BuiltWithoutOpenssl indicates if openssl been disabled at compile-time
BuiltWithoutOpenssl = true
)
func errExit() {
fmt.Fprintln(os.Stderr, "gocryptfs has been compiled without openssl support but you are still trying to use openssl")
os.Exit(exitcodes.OpenSSL)
}
func New(_ []byte, _ bool) *StupidGCM {
errExit()
// Never reached
return &StupidGCM{}
}
func (g *StupidGCM) NonceSize() int {
errExit()
return -1
}
func (g *StupidGCM) Overhead() int {
errExit()
return -1
}
func (g *StupidGCM) Seal(_, _, _, _ []byte) []byte {
errExit()
return nil
}
func (g *StupidGCM) Open(_, _, _, _ []byte) ([]byte, error) {
errExit()
return nil, nil
}
func (g *StupidGCM) Wipe() {
errExit()
}

952
app/libgocryptfs/main.go Normal file
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@ -0,0 +1,952 @@
package main
import (
"C"
"crypto/cipher"
"crypto/aes"
"syscall"
"strings"
"bytes"
"unsafe"
"os"
"io"
"fmt"
"path/filepath"
"golang.org/x/sys/unix"
"./gocryptfs_internal/cryptocore"
"./gocryptfs_internal/stupidgcm"
"./gocryptfs_internal/eme"
"./gocryptfs_internal/nametransform"
"./rewrites/syscallcompat"
"./rewrites/configfile"
"./rewrites/contentenc"
)
const (
file_mode = uint32(0660)
folder_mode = uint32(0770)
)
type Directory struct {
fd int
iv []byte
}
type File struct {
fd *os.File
path string
}
type SessionVars struct {
root_cipher_dir string
nameTransform *nametransform.NameTransform
cryptoCore *cryptocore.CryptoCore
contentEnc *contentenc.ContentEnc
dirCache map[string]Directory
file_handles map[int]File
fileIDs map[int][]byte
}
//var fdebug *os.File
var sessions map[int]SessionVars
func err_to_bool(e error) bool {
if e == nil {
return true
}
return false
}
func wipe(d []byte){
for i := range d {
d[i] = 0
}
d = nil
}
func clear_dirCache(sessionID int) {
for k, _ := range sessions[sessionID].dirCache {
delete(sessions[sessionID].dirCache, k)
}
}
func openBackingDir(sessionID int, relPath string) (dirfd int, cName string, err error) {
dirRelPath := nametransform.Dir(relPath)
dir, ok := sessions[sessionID].dirCache[dirRelPath]
if ok {
// If relPath is empty, cName is ".".
if relPath == "" {
cache_dirfd, err := syscall.Dup(dir.fd)
if err != nil {
return -1, "", err
}
return cache_dirfd, ".", nil
}
name := filepath.Base(relPath)
cName, err = sessions[sessionID].nameTransform.EncryptAndHashName(name, dir.iv)
if err != nil {
syscall.Close(dir.fd)
return -1, "", err
}
cache_dirfd, err := syscall.Dup(dir.fd)
if err != nil {
return -1, "", err
}
return cache_dirfd, cName, nil
}
// Open cipherdir (following symlinks)
dirfd, err = syscall.Open(sessions[sessionID].root_cipher_dir, syscall.O_DIRECTORY|syscallcompat.O_PATH, 0)
if err != nil {
return -1, "", err
}
// If relPath is empty, cName is ".".
if relPath == "" {
return dirfd, ".", nil
}
// Walk the directory tree
parts := strings.Split(relPath, "/")
for i, name := range parts {
iv, err := nametransform.ReadDirIVAt(dirfd)
if err != nil {
syscall.Close(dirfd)
return -1, "", err
}
cName, err = sessions[sessionID].nameTransform.EncryptAndHashName(name, iv)
if err != nil {
syscall.Close(dirfd)
return -1, "", err
}
// Last part? We are done.
if i == len(parts)-1 {
cache_dirfd, err := syscall.Dup(dirfd)
if err == nil {
sessions[sessionID].dirCache[dirRelPath] = Directory{cache_dirfd, iv}
}
break
}
// Not the last part? Descend into next directory.
dirfd2, err := syscallcompat.Openat(dirfd, cName, syscall.O_NOFOLLOW|syscall.O_DIRECTORY|syscallcompat.O_PATH, 0)
syscall.Close(dirfd)
if err != nil {
return -1, "", err
}
dirfd = dirfd2
}
return dirfd, cName, nil
}
func mkdirWithIv(dirfd int, cName string, mode uint32) error {
err := syscallcompat.Mkdirat(dirfd, cName, mode)
if err != nil {
return err
}
dirfd2, err := syscallcompat.Openat(dirfd, cName, syscall.O_DIRECTORY|syscall.O_NOFOLLOW|syscallcompat.O_PATH, 0)
if err == nil {
// Create gocryptfs.diriv
err = nametransform.WriteDirIVAt(dirfd2)
syscall.Close(dirfd2)
}
if err != nil {
// Delete inconsistent directory (missing gocryptfs.diriv!)
err2 := syscallcompat.Unlinkat(dirfd, cName, unix.AT_REMOVEDIR)
if err2 != nil {
return err2
}
}
return err
}
func mangleOpenFlags(flags uint32) (newFlags int) {
newFlags = int(flags)
// Convert WRONLY to RDWR. We always need read access to do read-modify-write cycles.
if (newFlags & syscall.O_ACCMODE) == syscall.O_WRONLY {
newFlags = newFlags ^ os.O_WRONLY | os.O_RDWR
}
// We also cannot open the file in append mode, we need to seek back for RMW
newFlags = newFlags &^ os.O_APPEND
// O_DIRECT accesses must be aligned in both offset and length. Due to our
// crypto header, alignment will be off, even if userspace makes aligned
// accesses. Running xfstests generic/013 on ext4 used to trigger lots of
// EINVAL errors due to missing alignment. Just fall back to buffered IO.
newFlags = newFlags &^ syscallcompat.O_DIRECT
// Create and Open are two separate FUSE operations, so O_CREAT should not
// be part of the open flags.
newFlags = newFlags &^ syscall.O_CREAT
// We always want O_NOFOLLOW to be safe against symlink races
newFlags |= syscall.O_NOFOLLOW
return newFlags
}
func register_file_handle(sessionID int, file File) int {
handleID := -1
c := 0
for handleID == -1 {
_, ok := sessions[sessionID].file_handles[c]
if !ok {
handleID = c
}
c++
}
sessions[sessionID].file_handles[handleID] = file
return handleID
}
func readFileID(fd *os.File) ([]byte, error) {
// We read +1 byte to determine if the file has actual content
// and not only the header. A header-only file will be considered empty.
// This makes File ID poisoning more difficult.
readLen := contentenc.HeaderLen + 1
buf := make([]byte, readLen)
_, err := fd.ReadAt(buf, 0)
if err != nil {
return nil, err
}
buf = buf[:contentenc.HeaderLen]
h, err := contentenc.ParseHeader(buf)
if err != nil {
return nil, err
}
return h.ID, nil
}
func createHeader(fd *os.File) (fileID []byte, err error) {
h := contentenc.RandomHeader()
buf := h.Pack()
// Prevent partially written (=corrupt) header by preallocating the space beforehand
//NoPrealloc
err = syscallcompat.EnospcPrealloc(int(fd.Fd()), 0, contentenc.HeaderLen)
if err != nil {
return nil, err
}
// Actually write header
_, err = fd.WriteAt(buf, 0)
if err != nil {
return nil, err
}
return h.ID, err
}
func doRead(sessionID, handleID int, dst_buff []byte, offset uint64, length uint64) ([]byte, bool) {
f, ok := sessions[sessionID].file_handles[handleID]
if !ok {
return nil, false
}
fd := f.fd
var fileID []byte
test_fileID, ok := sessions[sessionID].fileIDs[handleID]
if ok {
fileID = test_fileID
} else {
var err error
fileID, err = readFileID(fd)
if err != nil || fileID == nil {
return nil, false
}
sessions[sessionID].fileIDs[handleID] = fileID
}
// Read the backing ciphertext in one go
blocks := sessions[sessionID].contentEnc.ExplodePlainRange(offset, length)
alignedOffset, alignedLength := blocks[0].JointCiphertextRange(blocks)
skip := blocks[0].Skip
ciphertext := sessions[sessionID].contentEnc.CReqPool.Get()
ciphertext = ciphertext[:int(alignedLength)]
n, err := fd.ReadAt(ciphertext, int64(alignedOffset))
if err != nil && err != io.EOF {
return nil, false
}
// The ReadAt came back empty. We can skip all the decryption and return early.
if n == 0 {
sessions[sessionID].contentEnc.CReqPool.Put(ciphertext)
return dst_buff, true
}
// Truncate ciphertext buffer down to actually read bytes
ciphertext = ciphertext[0:n]
firstBlockNo := blocks[0].BlockNo
// Decrypt it
plaintext, err := sessions[sessionID].contentEnc.DecryptBlocks(ciphertext, firstBlockNo, fileID)
sessions[sessionID].contentEnc.CReqPool.Put(ciphertext)
if err != nil {
return nil, false
}
// Crop down to the relevant part
var out []byte
lenHave := len(plaintext)
lenWant := int(skip + length)
if lenHave > lenWant {
out = plaintext[skip:lenWant]
} else if lenHave > int(skip) {
out = plaintext[skip:lenHave]
}
// else: out stays empty, file was smaller than the requested offset
out = append(dst_buff, out...)
sessions[sessionID].contentEnc.PReqPool.Put(plaintext)
return out, true
}
func doWrite(sessionID, handleID int, data []byte, offset uint64) (uint32, bool){
fileWasEmpty := false
f, ok := sessions[sessionID].file_handles[handleID]
if !ok {
return 0, false
}
fd := f.fd
var err error
var fileID []byte
test_fileID, ok := sessions[sessionID].fileIDs[handleID]
if ok {
fileID = test_fileID
} else {
fileID, err = readFileID(fd)
// Write a new file header if the file is empty
if err == io.EOF {
fileID, err = createHeader(fd)
fileWasEmpty = true
}
if err != nil {
return 0, false
}
sessions[sessionID].fileIDs[handleID] = fileID
}
// Handle payload data
dataBuf := bytes.NewBuffer(data)
blocks := sessions[sessionID].contentEnc.ExplodePlainRange(offset, uint64(len(data)))
toEncrypt := make([][]byte, len(blocks))
for i, b := range blocks {
blockData := dataBuf.Next(int(b.Length))
// Incomplete block -> Read-Modify-Write
if b.IsPartial() {
// Read
oldData, success := doRead(sessionID, handleID, nil, b.BlockPlainOff(), sessions[sessionID].contentEnc.PlainBS())
if !success {
return 0, false
}
// Modify
blockData = sessions[sessionID].contentEnc.MergeBlocks(oldData, blockData, int(b.Skip))
}
// Write into the to-encrypt list
toEncrypt[i] = blockData
}
// Encrypt all blocks
ciphertext := sessions[sessionID].contentEnc.EncryptBlocks(toEncrypt, blocks[0].BlockNo, fileID)
// Preallocate so we cannot run out of space in the middle of the write.
// This prevents partially written (=corrupt) blocks.
cOff := int64(blocks[0].BlockCipherOff())
//NoPrealloc
err = syscallcompat.EnospcPrealloc(int(fd.Fd()), cOff, int64(len(ciphertext)))
if err != nil {
if fileWasEmpty {
syscall.Ftruncate(int(fd.Fd()), 0)
// Kill the file header again
gcf_close_file(sessionID, handleID) //f.fileTableEntry.ID = nil
}
return 0, false
}
// Write
_, err = fd.WriteAt(ciphertext, cOff)
// Return memory to CReqPool
sessions[sessionID].contentEnc.CReqPool.Put(ciphertext)
if err != nil {
return 0, false
}
return uint32(len(data)), true
}
// Zero-pad the file of size plainSize to the next block boundary. This is a no-op
// if the file is already block-aligned.
func zeroPad(sessionID, handleID int, plainSize uint64) bool {
lastBlockLen := plainSize % sessions[sessionID].contentEnc.PlainBS()
if lastBlockLen == 0 {
// Already block-aligned
return true
}
missing := sessions[sessionID].contentEnc.PlainBS() - lastBlockLen
pad := make([]byte, missing)
_, success := doWrite(sessionID, handleID, pad, plainSize)
return success
}
// truncateGrowFile extends a file using seeking or ftruncate performing RMW on
// the first and last block as necessary. New blocks in the middle become
// file holes unless they have been fallocate()'d beforehand.
func truncateGrowFile(sessionID, handleID int, oldPlainSz uint64, newPlainSz uint64) bool {
if newPlainSz <= oldPlainSz {
return false
}
newEOFOffset := newPlainSz - 1
if oldPlainSz > 0 {
n1 := sessions[sessionID].contentEnc.PlainOffToBlockNo(oldPlainSz - 1)
n2 := sessions[sessionID].contentEnc.PlainOffToBlockNo(newEOFOffset)
// The file is grown within one block, no need to pad anything.
// Write a single zero to the last byte and let doWrite figure out the RMW.
if n1 == n2 {
buf := make([]byte, 1)
_, success := doWrite(sessionID, handleID, buf, newEOFOffset)
return success
}
}
// The truncate creates at least one new block.
//
// Make sure the old last block is padded to the block boundary. This call
// is a no-op if it is already block-aligned.
success := zeroPad(sessionID, handleID, oldPlainSz)
if !success {
return false
}
// The new size is block-aligned. In this case we can do everything ourselves
// and avoid the call to doWrite.
if newPlainSz%sessions[sessionID].contentEnc.PlainBS() == 0 {
// The file was empty, so it did not have a header. Create one.
if oldPlainSz == 0 {
id, err := createHeader(sessions[sessionID].file_handles[handleID].fd)
if err != nil {
return false
}
sessions[sessionID].fileIDs[handleID] = id
}
cSz := int64(sessions[sessionID].contentEnc.PlainSizeToCipherSize(newPlainSz))
return err_to_bool(syscall.Ftruncate(int(sessions[sessionID].file_handles[handleID].fd.Fd()), cSz))
}
// The new size is NOT aligned, so we need to write a partial block.
// Write a single zero to the last byte and let doWrite figure it out.
buf := make([]byte, 1)
_, success = doWrite(sessionID, handleID, buf, newEOFOffset)
return success
}
func truncate(sessionID, handleID int, newSize uint64) bool {
fileFD := int(sessions[sessionID].file_handles[handleID].fd.Fd())
/*// Common case first: Truncate to zero
if newSize == 0 {
err = syscall.Ftruncate(fileFD, 0)
if err != nil {
return false
}
// Truncate to zero kills the file header
f.fileTableEntry.ID = nil
return true
}*/
// We need the old file size to determine if we are growing or shrinking
// the file
oldSize, _, success := gcf_get_attrs(sessionID, sessions[sessionID].file_handles[handleID].path)
if !success {
return false
}
// File size stays the same - nothing to do
if newSize == oldSize {
return true
}
// File grows
if newSize > oldSize {
return truncateGrowFile(sessionID, handleID, oldSize, newSize)
}
// File shrinks
blockNo := sessions[sessionID].contentEnc.PlainOffToBlockNo(newSize)
cipherOff := sessions[sessionID].contentEnc.BlockNoToCipherOff(blockNo)
plainOff := sessions[sessionID].contentEnc.BlockNoToPlainOff(blockNo)
lastBlockLen := newSize - plainOff
var data []byte
if lastBlockLen > 0 {
data, success = doRead(sessionID, handleID, nil, plainOff, lastBlockLen)
if !success {
return false
}
}
// Truncate down to the last complete block
err := syscall.Ftruncate(fileFD, int64(cipherOff))
if err != nil {
return false
}
// Append partial block
if lastBlockLen > 0 {
_, success := doWrite(sessionID, handleID, data, plainOff)
return success
}
return true
}
func init_new_session(root_cipher_dir string, masterkey []byte) int {
// Initialize EME for filename encryption.
var emeCipher *eme.EMECipher
var err error
var emeBlockCipher cipher.Block
emeKey := cryptocore.HkdfDerive(masterkey, cryptocore.HkdfInfoEMENames, cryptocore.KeyLen)
emeBlockCipher, err = aes.NewCipher(emeKey)
for i := range emeKey {
emeKey[i] = 0
}
if err == nil {
var new_session SessionVars
emeCipher = eme.New(emeBlockCipher)
new_session.nameTransform = nametransform.New(emeCipher, true, true)
// Initialize contentEnc
cryptoBackend := cryptocore.BackendGoGCM
if stupidgcm.PreferOpenSSL() {
cryptoBackend = cryptocore.BackendOpenSSL
}
forcedecode := false
new_session.cryptoCore = cryptocore.New(masterkey, cryptoBackend, contentenc.DefaultIVBits, true, forcedecode)
new_session.contentEnc = contentenc.New(new_session.cryptoCore, contentenc.DefaultBS, forcedecode)
//copying root_cipher_dir
var grcd strings.Builder
grcd.WriteString(root_cipher_dir)
new_session.root_cipher_dir = grcd.String()
// New empty caches
new_session.dirCache = make(map[string]Directory)
new_session.file_handles = make(map[int]File)
new_session.fileIDs = make(map[int][]byte)
//find unused sessionID
sessionID := -1
c := 0
for sessionID == -1 {
_, ok := sessions[c]
if !ok {
sessionID = c
}
c++
}
if sessions == nil {
//fdebug, _ = os.OpenFile("/storage/emulated/0/gologs.txt", os.O_WRONLY | os.O_TRUNC | os.O_CREATE, os.FileMode(file_mode))
sessions = make(map[int]SessionVars)
}
sessions[sessionID] = new_session;
return sessionID
}
return -1
}
//export gcf_init
func gcf_init(root_cipher_dir string, password, givenScryptHash, returnedScryptHashBuff []byte) int {
sessionID := -1
cf, err := configfile.Load(filepath.Join(root_cipher_dir, configfile.ConfDefaultName))
if err == nil {
masterkey := cf.GetMasterkey(password, givenScryptHash, returnedScryptHashBuff)
if masterkey != nil {
sessionID = init_new_session(root_cipher_dir, masterkey)
wipe(masterkey)
}
}
return sessionID
}
//export gcf_close
func gcf_close(sessionID int){
sessions[sessionID].cryptoCore.Wipe()
for handleID, _ := range sessions[sessionID].file_handles {
gcf_close_file(sessionID, handleID)
}
clear_dirCache(sessionID)
delete(sessions, sessionID)
}
//export gcf_create_volume
func gcf_create_volume(root_cipher_dir string, password []byte, logN int, creator string) bool {
err := configfile.Create(filepath.Join(root_cipher_dir, configfile.ConfDefaultName), password, false, logN, creator, false, false)
if err == nil {
dirfd, err := syscall.Open(root_cipher_dir, syscall.O_DIRECTORY|syscallcompat.O_PATH, 0)
if err == nil {
err = nametransform.WriteDirIVAt(dirfd)
syscall.Close(dirfd)
return err_to_bool(err)
}
}
return false
}
//export gcf_change_password
func gcf_change_password(root_cipher_dir string, old_password, givenScryptHash, new_password, returnedScryptHashBuff []byte) bool {
success := false
cf, err := configfile.Load(filepath.Join(root_cipher_dir, configfile.ConfDefaultName))
if err == nil {
masterkey := cf.GetMasterkey(old_password, givenScryptHash, nil)
if masterkey != nil {
logN := cf.ScryptObject.LogN()
scryptHash := cf.EncryptKey(masterkey, new_password, logN, len(returnedScryptHashBuff)>0)
wipe(masterkey)
for i := range scryptHash {
returnedScryptHashBuff[i] = scryptHash[i]
scryptHash[i] = 0
}
success = err_to_bool(cf.WriteFile())
}
}
return success
}
//export gcf_list_dir
func gcf_list_dir(sessionID int, dirName string) (*C.char, *C.int, C.int) {
parentDirFd, cDirName, err := openBackingDir(sessionID, dirName)
if err != nil {
return nil, nil, 0
}
defer syscall.Close(parentDirFd)
// Read ciphertext directory
var cipherEntries []syscallcompat.DirEntry
fd, err := syscallcompat.Openat(parentDirFd, cDirName, syscall.O_RDONLY|syscall.O_DIRECTORY|syscall.O_NOFOLLOW, 0)
if err != nil {
return nil, nil, 0
}
defer syscall.Close(fd)
cipherEntries, err = syscallcompat.Getdents(fd)
if err != nil {
return nil, nil, 0
}
// Get DirIV (stays nil if PlaintextNames is used)
var cachedIV []byte
// Read the DirIV from disk
cachedIV, err = nametransform.ReadDirIVAt(fd)
if err != nil {
return nil, nil, 0
}
// Decrypted directory entries
var plain strings.Builder
var modes []uint32
// Filter and decrypt filenames
for i := range cipherEntries {
cName := cipherEntries[i].Name
if dirName == "" && cName == configfile.ConfDefaultName {
// silently ignore "gocryptfs.conf" in the top level dir
continue
}
if cName == nametransform.DirIVFilename {
// silently ignore "gocryptfs.diriv" everywhere if dirIV is enabled
continue
}
// Handle long file name
isLong := nametransform.NameType(cName)
if isLong == nametransform.LongNameContent {
cNameLong, err := nametransform.ReadLongNameAt(fd, cName)
if err != nil {
continue
}
cName = cNameLong
} else if isLong == nametransform.LongNameFilename {
// ignore "gocryptfs.longname.*.name"
continue
}
name, err := sessions[sessionID].nameTransform.DecryptName(cName, cachedIV)
if err != nil {
continue
}
// Override the ciphertext name with the plaintext name but reuse the rest
// of the structure
cipherEntries[i].Name = name
plain.WriteString(cipherEntries[i].Name+"\x00")
modes = append(modes, cipherEntries[i].Mode)
}
p := C.malloc(C.ulong(C.sizeof_int*len(modes)))
for i := 0; i < len(modes); i++ {
offset := C.sizeof_int*uintptr(i)
*(*C.int)(unsafe.Pointer(uintptr(p)+offset)) = (C.int)(modes[i])
}
return C.CString(plain.String()), (*C.int)(p), (C.int)(len(modes))
}
//export gcf_mkdir
func gcf_mkdir(sessionID int, newPath string) bool {
dirfd, cName, err := openBackingDir(sessionID, newPath)
if err != nil {
return false
}
defer syscall.Close(dirfd)
// We need write and execute permissions to create gocryptfs.diriv.
// Also, we need read permissions to open the directory (to avoid
// race-conditions between getting and setting the mode).
origMode := folder_mode
mode := folder_mode | 0700
// Handle long file name
if nametransform.IsLongContent(cName) {
// Create ".name"
err = sessions[sessionID].nameTransform.WriteLongNameAt(dirfd, cName, newPath)
if err != nil {
return false
}
// Create directory
err = mkdirWithIv(dirfd, cName, mode)
if err != nil {
nametransform.DeleteLongNameAt(dirfd, cName)
return false
}
} else {
err = mkdirWithIv(dirfd, cName, mode)
if err != nil {
return false
}
}
// Set mode
if origMode != mode {
dirfd2, err := syscallcompat.Openat(dirfd, cName,
syscall.O_RDONLY|syscall.O_DIRECTORY|syscall.O_NOFOLLOW, 0)
if err != nil {
return false
}
defer syscall.Close(dirfd2)
var st syscall.Stat_t
err = syscall.Fstat(dirfd2, &st)
if err != nil {
return false
}
// Preserve SGID bit if it was set due to inheritance.
origMode = uint32(st.Mode&^0777) | origMode
err = syscall.Fchmod(dirfd2, origMode)
if err != nil {
return false
}
}
return true
}
//export gcf_rmdir
func gcf_rmdir(sessionID int, relPath string) bool {
defer clear_dirCache(sessionID)
parentDirFd, cName, err := openBackingDir(sessionID, relPath)
if err != nil {
return false
}
defer syscall.Close(parentDirFd)
dirfd, err := syscallcompat.Openat(parentDirFd, cName, syscall.O_RDONLY|syscall.O_DIRECTORY|syscall.O_NOFOLLOW, 0)
if err != nil {
return false
}
defer syscall.Close(dirfd)
// Check directory contents
children, err := syscallcompat.Getdents(dirfd)
if err == io.EOF {
// The directory is empty
err = unix.Unlinkat(parentDirFd, cName, unix.AT_REMOVEDIR)
return err_to_bool(err)
}
if err != nil {
return false
}
// If the directory is not empty besides gocryptfs.diriv, do not even
// attempt the dance around gocryptfs.diriv.
if len(children) > 1 {
return false
}
// Move "gocryptfs.diriv" to the parent dir as "gocryptfs.diriv.rmdir.XYZ"
tmpName := fmt.Sprintf("%s.rmdir.%d", nametransform.DirIVFilename, cryptocore.RandUint64())
err = syscallcompat.Renameat(dirfd, nametransform.DirIVFilename, parentDirFd, tmpName)
if err != nil {
return false
}
// Actual Rmdir
err = syscallcompat.Unlinkat(parentDirFd, cName, unix.AT_REMOVEDIR)
if err != nil {
// This can happen if another file in the directory was created in the
// meantime, undo the rename
err2 := syscallcompat.Renameat(parentDirFd, tmpName, dirfd, nametransform.DirIVFilename)
return err_to_bool(err2)
}
// Delete "gocryptfs.diriv.rmdir.XYZ"
err = syscallcompat.Unlinkat(parentDirFd, tmpName, 0)
// Delete .name file
if nametransform.IsLongContent(cName) {
nametransform.DeleteLongNameAt(parentDirFd, cName)
}
return true
}
//export gcf_open_read_mode
func gcf_open_read_mode(sessionID int, path string) int {
newFlags := mangleOpenFlags(0)
dirfd, cName, err := openBackingDir(sessionID, path)
if err != nil {
return -1
}
defer syscall.Close(dirfd)
fd, err := syscallcompat.Openat(dirfd, cName, newFlags, 0)
// Handle a few specific errors
if err != nil {
return -1
}
return register_file_handle(sessionID, File{os.NewFile(uintptr(fd), cName), path})
}
//export gcf_open_write_mode
func gcf_open_write_mode(sessionID int, path string) int {
newFlags := mangleOpenFlags(syscall.O_RDWR)
dirfd, cName, err := openBackingDir(sessionID, path)
if err != nil {
return -1
}
defer syscall.Close(dirfd)
fd := -1
// Handle long file name
if nametransform.IsLongContent(cName) {
// Create ".name"
err = sessions[sessionID].nameTransform.WriteLongNameAt(dirfd, cName, path)
if err != nil {
return -1
}
// Create content
fd, err = syscallcompat.Openat(dirfd, cName, newFlags|syscall.O_CREAT, file_mode)
if err != nil {
nametransform.DeleteLongNameAt(dirfd, cName)
}
} else {
// Create content, normal (short) file name
fd, err = syscallcompat.Openat(dirfd, cName, newFlags|syscall.O_CREAT, file_mode)
}
if err != nil {
// xfstests generic/488 triggers this
if err == syscall.EMFILE {
var lim syscall.Rlimit
syscall.Getrlimit(syscall.RLIMIT_NOFILE, &lim)
}
return -1
}
return register_file_handle(sessionID, File{os.NewFile(uintptr(fd), cName), path})
}
//export gcf_truncate
func gcf_truncate(sessionID int, path string, offset uint64) bool {
handleID := gcf_open_write_mode(sessionID, path)
if handleID != -1 {
success := truncate(sessionID, handleID, offset)
gcf_close_file(sessionID, handleID)
return success
}
return false
}
//export gcf_close_file
func gcf_close_file(sessionID, handleID int){
f, ok := sessions[sessionID].file_handles[handleID]
if ok {
f.fd.Close()
delete(sessions[sessionID].file_handles, handleID)
_, ok := sessions[sessionID].fileIDs[handleID]
if ok {
delete(sessions[sessionID].fileIDs, handleID)
}
}
}
//export gcf_read_file
func gcf_read_file(sessionID, handleID int, offset uint64, dst_buff []byte) uint32 {
length := uint64(len(dst_buff))
if length > contentenc.MAX_KERNEL_WRITE {
return 0;
}
out, _ := doRead(sessionID, handleID, dst_buff[:0], offset, length)
return uint32(len(out))
}
//export gcf_write_file
func gcf_write_file(sessionID, handleID int, offset uint64, data []byte) uint32 {
length := uint64(len(data))
if length > contentenc.MAX_KERNEL_WRITE {
return 0;
}
written, _ := doWrite(sessionID, handleID, data, offset)
return written
}
//export gcf_get_attrs
func gcf_get_attrs(sessionID int, relPath string) (uint64, int64, bool) {
dirfd, cName, err := openBackingDir(sessionID, relPath)
if err != nil {
return 0, 0, false
}
var st unix.Stat_t
err = syscallcompat.Fstatat(dirfd, cName, &st, unix.AT_SYMLINK_NOFOLLOW)
syscall.Close(dirfd)
if err != nil {
return 0, 0, false
}
return sessions[sessionID].contentEnc.CipherSizeToPlainSize(uint64(st.Size)), st.Mtim.Sec, true
}
//export gcf_rename
func gcf_rename(sessionID int, oldPath string, newPath string) bool {
defer clear_dirCache(sessionID)
oldDirfd, oldCName, err := openBackingDir(sessionID, oldPath)
if err != nil {
return false
}
defer syscall.Close(oldDirfd)
newDirfd, newCName, err := openBackingDir(sessionID, newPath)
if err != nil {
return false
}
defer syscall.Close(newDirfd)
// Long destination file name: create .name file
nameFileAlreadyThere := false
if nametransform.IsLongContent(newCName) {
err = sessions[sessionID].nameTransform.WriteLongNameAt(newDirfd, newCName, newPath)
// Failure to write the .name file is expected when the target path already
// exists. Since hashes are pretty unique, there is no need to modify the
// .name file in this case, and we ignore the error.
if err == syscall.EEXIST {
nameFileAlreadyThere = true
} else if err != nil {
return false
}
}
// Actual rename
err = syscallcompat.Renameat(oldDirfd, oldCName, newDirfd, newCName)
if err == syscall.ENOTEMPTY || err == syscall.EEXIST {
// If an empty directory is overwritten we will always get an error as
// the "empty" directory will still contain gocryptfs.diriv.
// Interestingly, ext4 returns ENOTEMPTY while xfs returns EEXIST.
// We handle that by trying to fs.Rmdir() the target directory and trying
// again.
if gcf_rmdir(sessionID, newPath) {
err = syscallcompat.Renameat(oldDirfd, oldCName, newDirfd, newCName)
}
}
if err != nil {
if nametransform.IsLongContent(newCName) && nameFileAlreadyThere == false {
// Roll back .name creation unless the .name file was already there
nametransform.DeleteLongNameAt(newDirfd, newCName)
}
return false
}
if nametransform.IsLongContent(oldCName) {
nametransform.DeleteLongNameAt(oldDirfd, oldCName)
}
return true
}
//export gcf_remove_file
func gcf_remove_file(sessionID int, path string) bool {
dirfd, cName, err := openBackingDir(sessionID, path)
if err != nil {
return false
}
defer syscall.Close(dirfd)
// Delete content
err = syscallcompat.Unlinkat(dirfd, cName, 0)
if err != nil {
return false
}
// Delete ".name" file
if nametransform.IsLongContent(cName) {
err = nametransform.DeleteLongNameAt(dirfd, cName)
}
return err_to_bool(err)
}
func main(){}

325
app/libgocryptfs/rewrites/configfile/config_file.go Normal file
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// Package configfile reads and writes gocryptfs.conf does the key
// wrapping.
package configfile
import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"log"
"syscall"
"../contentenc"
"../../gocryptfs_internal/cryptocore"
"../../gocryptfs_internal/exitcodes"
)
import "os"
const (
// ConfDefaultName is the default configuration file name.
// The dot "." is not used in base64url (RFC4648), hence
// we can never clash with an encrypted file.
ConfDefaultName = "gocryptfs.conf"
// ConfReverseName is the default configuration file name in reverse mode,
// the config file gets stored next to the plain-text files. Make it hidden
// (start with dot) to not annoy the user.
ConfReverseName = ".gocryptfs.reverse.conf"
)
// ConfFile is the content of a config file.
type ConfFile struct {
// Creator is the gocryptfs version string.
// This only documents the config file for humans who look at it. The actual
// technical info is contained in FeatureFlags.
Creator string
// EncryptedKey holds an encrypted AES key, unlocked using a password
// hashed with scrypt
EncryptedKey []byte
// ScryptObject stores parameters for scrypt hashing (key derivation)
ScryptObject ScryptKDF
// Version is the On-Disk-Format version this filesystem uses
Version uint16
// FeatureFlags is a list of feature flags this filesystem has enabled.
// If gocryptfs encounters a feature flag it does not support, it will refuse
// mounting. This mechanism is analogous to the ext4 feature flags that are
// stored in the superblock.
FeatureFlags []string
// Filename is the name of the config file. Not exported to JSON.
filename string
}
// randBytesDevRandom gets "n" random bytes from /dev/random or panics
func randBytesDevRandom(n int) []byte {
f, err := os.Open("/dev/random")
if err != nil {
log.Panic("Failed to open /dev/random: " + err.Error())
}
defer f.Close()
b := make([]byte, n)
_, err = io.ReadFull(f, b)
if err != nil {
log.Panic("Failed to read random bytes: " + err.Error())
}
return b
}
// Create - create a new config with a random key encrypted with
// "password" and write it to "filename".
// Uses scrypt with cost parameter logN.
func Create(filename string, password []byte, plaintextNames bool,
logN int, creator string, aessiv bool, devrandom bool) error {
var cf ConfFile
cf.filename = filename
cf.Creator = creator
cf.Version = contentenc.CurrentVersion
// Set feature flags
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagGCMIV128])
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagHKDF])
if plaintextNames {
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagPlaintextNames])
} else {
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagDirIV])
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagEMENames])
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagLongNames])
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagRaw64])
}
if aessiv {
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagAESSIV])
}
{
// Generate new random master key
var key []byte
if devrandom {
key = randBytesDevRandom(cryptocore.KeyLen)
} else {
key = cryptocore.RandBytes(cryptocore.KeyLen)
}
// Encrypt it using the password
// This sets ScryptObject and EncryptedKey
// Note: this looks at the FeatureFlags, so call it AFTER setting them.
cf.EncryptKey(key, password, logN, false)
for i := range key {
key[i] = 0
}
// key runs out of scope here
}
// Write file to disk
return cf.WriteFile()
}
// LoadAndDecrypt - read config file from disk and decrypt the
// contained key using "password".
// Returns the decrypted key and the ConfFile object
//
// If "password" is empty, the config file is read
// but the key is not decrypted (returns nil in its place).
func LoadAndDecrypt(filename string, password []byte) ([]byte, *ConfFile, error) {
cf, err := Load(filename)
if err != nil {
return nil, nil, err
}
if len(password) == 0 {
// We have validated the config file, but without a password we cannot
// decrypt the master key. Return only the parsed config.
return nil, cf, nil
// TODO: Make this an error in gocryptfs v1.7. All code should now call
// Load() instead of calling LoadAndDecrypt() with an empty password.
}
// Decrypt the masterkey using the password
key, _, err := cf.DecryptMasterKey(password, false)
if err != nil {
return nil, nil, err
}
return key, cf, err
}
// Load loads and parses the config file at "filename".
func Load(filename string) (*ConfFile, error) {
var cf ConfFile
cf.filename = filename
// Read from disk
js, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
if len(js) == 0 {
return nil, fmt.Errorf("Config file is empty")
}
// Unmarshal
err = json.Unmarshal(js, &cf)
if err != nil {
return nil, err
}
if cf.Version != contentenc.CurrentVersion {
return nil, fmt.Errorf("Unsupported on-disk format %d", cf.Version)
}
// Check that all set feature flags are known
for _, flag := range cf.FeatureFlags {
if !cf.isFeatureFlagKnown(flag) {
return nil, fmt.Errorf("Unsupported feature flag %q", flag)
}
}
// Check that all required feature flags are set
var requiredFlags []flagIota
if cf.IsFeatureFlagSet(FlagPlaintextNames) {
requiredFlags = requiredFlagsPlaintextNames
} else {
requiredFlags = requiredFlagsNormal
}
deprecatedFs := false
for _, i := range requiredFlags {
if !cf.IsFeatureFlagSet(i) {
fmt.Fprintf(os.Stderr, "Required feature flag %q is missing\n", knownFlags[i])
deprecatedFs = true
}
}
if deprecatedFs {
return nil, exitcodes.NewErr("Deprecated filesystem", exitcodes.DeprecatedFS)
}
// All good
return &cf, nil
}
// DecryptMasterKey decrypts the masterkey stored in cf.EncryptedKey using
// password.
func (cf *ConfFile) DecryptMasterKey(password []byte, giveHash bool) (masterkey, scryptHash []byte, err error) {
// Generate derived key from password
scryptHash = cf.ScryptObject.DeriveKey(password)
// Unlock master key using password-based key
useHKDF := cf.IsFeatureFlagSet(FlagHKDF)
ce := GetKeyEncrypter(scryptHash, useHKDF)
masterkey, err = ce.DecryptBlock(cf.EncryptedKey, 0, nil)
ce.Wipe()
ce = nil
if err != nil {
return nil, nil, exitcodes.NewErr("Password incorrect.", exitcodes.PasswordIncorrect)
}
if !giveHash {
// Purge scrypt-derived key
for i := range scryptHash {
scryptHash[i] = 0
}
scryptHash = nil
}
return masterkey, scryptHash, nil
}
// EncryptKey - encrypt "key" using an scrypt hash generated from "password"
// and store it in cf.EncryptedKey.
// Uses scrypt with cost parameter logN and stores the scrypt parameters in
// cf.ScryptObject.
func (cf *ConfFile) EncryptKey(key []byte, password []byte, logN int, giveHash bool) []byte {
// Generate scrypt-derived key from password
cf.ScryptObject = NewScryptKDF(logN)
scryptHash := cf.ScryptObject.DeriveKey(password)
// Lock master key using password-based key
useHKDF := cf.IsFeatureFlagSet(FlagHKDF)
ce := GetKeyEncrypter(scryptHash, useHKDF)
cf.EncryptedKey = ce.EncryptBlock(key, 0, nil)
if !giveHash {
// Purge scrypt-derived key
for i := range scryptHash {
scryptHash[i] = 0
}
scryptHash = nil
}
ce.Wipe()
ce = nil
return scryptHash
}
// DroidFS function to allow masterkey to be decrypted directely using the scrypt hash and return it if requested
func (cf *ConfFile) GetMasterkey(password, givenScryptHash, returnedScryptHashBuff []byte) []byte {
var masterkey []byte
var err error
var scryptHash []byte
if len(givenScryptHash) > 0 { //decrypt with hash
useHKDF := cf.IsFeatureFlagSet(FlagHKDF)
ce := GetKeyEncrypter(givenScryptHash, useHKDF)
masterkey, err = ce.DecryptBlock(cf.EncryptedKey, 0, nil)
ce.Wipe()
ce = nil
if err == nil {
return masterkey
}
} else { //decrypt with password
masterkey, scryptHash, err = cf.DecryptMasterKey(password, len(returnedScryptHashBuff)>0)
//copy and wipe scryptHash
for i := range scryptHash {
returnedScryptHashBuff[i] = scryptHash[i]
scryptHash[i] = 0
}
if err == nil {
return masterkey
}
}
return nil
}
// WriteFile - write out config in JSON format to file "filename.tmp"
// then rename over "filename".
// This way a password change atomically replaces the file.
func (cf *ConfFile) WriteFile() error {
tmp := cf.filename + ".tmp"
// 0400 permissions: gocryptfs.conf should be kept secret and never be written to.
fd, err := os.OpenFile(tmp, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0400)
if err != nil {
return err
}
js, err := json.MarshalIndent(cf, "", "\t")
if err != nil {
return err
}
// For convenience for the user, add a newline at the end.
js = append(js, '\n')
_, err = fd.Write(js)
if err != nil {
return err
}
err = fd.Sync()
if err != nil {
// This can happen on network drives: FRITZ.NAS mounted on MacOS returns
// "operation not supported": https://github.com/rfjakob/gocryptfs/issues/390
// Try sync instead
syscall.Sync()
}
err = fd.Close()
if err != nil {
return err
}
err = os.Rename(tmp, cf.filename)
return err
}
// getKeyEncrypter is a helper function that returns the right ContentEnc
// instance for the "useHKDF" setting.
func GetKeyEncrypter(scryptHash []byte, useHKDF bool) *contentenc.ContentEnc {
IVLen := 96
// gocryptfs v1.2 and older used 96-bit IVs for master key encryption.
// v1.3 adds the "HKDF" feature flag, which also enables 128-bit nonces.
if useHKDF {
IVLen = contentenc.DefaultIVBits
}
cc := cryptocore.New(scryptHash, cryptocore.BackendGoGCM, IVLen, useHKDF, false)
ce := contentenc.New(cc, 4096, false)
return ce
}

74
app/libgocryptfs/rewrites/configfile/feature_flags.go Normal file
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@ -0,0 +1,74 @@
package configfile
type flagIota int
const (
// FlagPlaintextNames indicates that filenames are unencrypted.
FlagPlaintextNames flagIota = iota
// FlagDirIV indicates that a per-directory IV file is used.
FlagDirIV
// FlagEMENames indicates EME (ECB-Mix-ECB) filename encryption.
// This flag is mandatory since gocryptfs v1.0.
FlagEMENames
// FlagGCMIV128 indicates 128-bit GCM IVs.
// This flag is mandatory since gocryptfs v1.0.
FlagGCMIV128
// FlagLongNames allows file names longer than 176 bytes.
FlagLongNames
// FlagAESSIV selects an AES-SIV based crypto backend.
FlagAESSIV
// FlagRaw64 enables raw (unpadded) base64 encoding for file names
FlagRaw64
// FlagHKDF enables HKDF-derived keys for use with GCM, EME and SIV
// instead of directly using the master key (GCM and EME) or the SHA-512
// hashed master key (SIV).
// Note that this flag does not change the password hashing algorithm
// which always is scrypt.
FlagHKDF
)
// knownFlags stores the known feature flags and their string representation
var knownFlags = map[flagIota]string{
FlagPlaintextNames: "PlaintextNames",
FlagDirIV: "DirIV",
FlagEMENames: "EMENames",
FlagGCMIV128: "GCMIV128",
FlagLongNames: "LongNames",
FlagAESSIV: "AESSIV",
FlagRaw64: "Raw64",
FlagHKDF: "HKDF",
}
// Filesystems that do not have these feature flags set are deprecated.
var requiredFlagsNormal = []flagIota{
FlagDirIV,
FlagEMENames,
FlagGCMIV128,
}
// Filesystems without filename encryption obviously don't have or need the
// filename related feature flags.
var requiredFlagsPlaintextNames = []flagIota{
FlagGCMIV128,
}
// isFeatureFlagKnown verifies that we understand a feature flag.
func (cf *ConfFile) isFeatureFlagKnown(flag string) bool {
for _, knownFlag := range knownFlags {
if knownFlag == flag {
return true
}
}
return false
}
// IsFeatureFlagSet returns true if the feature flag "flagWant" is enabled.
func (cf *ConfFile) IsFeatureFlagSet(flagWant flagIota) bool {
flagString := knownFlags[flagWant]
for _, flag := range cf.FeatureFlags {
if flag == flagString {
return true
}
}
return false
}

101
app/libgocryptfs/rewrites/configfile/scrypt.go Normal file
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package configfile
import (
"log"
"math"
"golang.org/x/crypto/scrypt"
"../../gocryptfs_internal/cryptocore"
)
const (
// ScryptDefaultLogN is the default scrypt logN configuration parameter.
// logN=16 (N=2^16) uses 64MB of memory and takes 4 seconds on my Atom Z3735F
// netbook.
ScryptDefaultLogN = 16
// From RFC7914, section 2:
// At the current time, r=8 and p=1 appears to yield good
// results, but as memory latency and CPU parallelism increase, it is
// likely that the optimum values for both r and p will increase.
// We reject all lower values that we might get through modified config files.
scryptMinR = 8
scryptMinP = 1
// logN=10 takes 6ms on a Pentium G630. This should be fast enough for all
// purposes. We reject lower values.
scryptMinLogN = 10
// We always generate 32-byte salts. Anything smaller than that is rejected.
scryptMinSaltLen = 32
)
// ScryptKDF is an instance of the scrypt key deriviation function.
type ScryptKDF struct {
// Salt is the random salt that is passed to scrypt
Salt []byte
// N: scrypt CPU/Memory cost parameter
N int
// R: scrypt block size parameter
R int
// P: scrypt parallelization parameter
P int
// KeyLen is the output data length
KeyLen int
}
// NewScryptKDF returns a new instance of ScryptKDF.
func NewScryptKDF(logN int) ScryptKDF {
var s ScryptKDF
s.Salt = cryptocore.RandBytes(cryptocore.KeyLen)
if logN <= 0 {
s.N = 1 << ScryptDefaultLogN
} else {
s.N = 1 << uint32(logN)
}
s.R = 8 // Always 8
s.P = 1 // Always 1
s.KeyLen = cryptocore.KeyLen
return s
}
// DeriveKey returns a new key from a supplied password.
func (s *ScryptKDF) DeriveKey(pw []byte) []byte {
if s.validateParams() {
k, err := scrypt.Key(pw, s.Salt, s.N, s.R, s.P, s.KeyLen)
if err != nil {
log.Panicf("DeriveKey failed: %v", err)
}
return k
} else {
return nil
}
}
// LogN - N is saved as 2^LogN, but LogN is much easier to work with.
// This function gives you LogN = Log2(N).
func (s *ScryptKDF) LogN() int {
return int(math.Log2(float64(s.N)) + 0.5)
}
// validateParams checks that all parameters are at or above hardcoded limits.
// If not, it exists with an error message.
// This makes sure we do not get weak parameters passed through a
// rougue gocryptfs.conf.
func (s *ScryptKDF) validateParams() bool {
minN := 1 << scryptMinLogN
if s.N < minN {
return false//os.Exit(exitcodes.ScryptParams)
}
if s.R < scryptMinR {
return false//os.Exit(exitcodes.ScryptParams)
}
if s.P < scryptMinP {
return false//os.Exit(exitcodes.ScryptParams)
}
if len(s.Salt) < scryptMinSaltLen {
return false//os.Exit(exitcodes.ScryptParams)
}
if s.KeyLen < cryptocore.KeyLen {
return false//os.Exit(exitcodes.ScryptParams)
}
return true
}

39
app/libgocryptfs/rewrites/contentenc/bpool.go Normal file
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package contentenc
import (
"log"
"sync"
)
// bPool is a byte slice pool
type bPool struct {
sync.Pool
sliceLen int
}
func newBPool(sliceLen int) bPool {
return bPool{
Pool: sync.Pool{
New: func() interface{} { return make([]byte, sliceLen) },
},
sliceLen: sliceLen,
}
}
// Put grows the slice "s" to its maximum capacity and puts it into the pool.
func (b *bPool) Put(s []byte) {
s = s[:cap(s)]
if len(s) != b.sliceLen {
log.Panicf("wrong len=%d, want=%d", len(s), b.sliceLen)
}
b.Pool.Put(s)
}
// Get returns a byte slice from the pool.
func (b *bPool) Get() (s []byte) {
s = b.Pool.Get().([]byte)
if len(s) != b.sliceLen {
log.Panicf("wrong len=%d, want=%d", len(s), b.sliceLen)
}
return s
}

335
app/libgocryptfs/rewrites/contentenc/content.go Normal file
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// Package contentenc encrypts and decrypts file blocks.
package contentenc
import (
"bytes"
"encoding/binary"
"errors"
"log"
"runtime"
"sync"
"../../gocryptfs_internal/cryptocore"
"../../gocryptfs_internal/stupidgcm"
)
// NonceMode determines how nonces are created.
type NonceMode int
const (
//value from FUSE doc
MAX_KERNEL_WRITE = 128 * 1024
// DefaultBS is the default plaintext block size
DefaultBS = 4096
// DefaultIVBits is the default length of IV, in bits.
// We always use 128-bit IVs for file content, but the
// master key in the config file is encrypted with a 96-bit IV for
// gocryptfs v1.2 and earlier. v1.3 switched to 128 bit.
DefaultIVBits = 128
_ = iota // skip zero
// RandomNonce chooses a random nonce.
RandomNonce NonceMode = iota
// ReverseDeterministicNonce chooses a deterministic nonce, suitable for
// use in reverse mode.
ReverseDeterministicNonce NonceMode = iota
// ExternalNonce derives a nonce from external sources.
ExternalNonce NonceMode = iota
)
// ContentEnc is used to encipher and decipher file content.
type ContentEnc struct {
// Cryptographic primitives
cryptoCore *cryptocore.CryptoCore
// Plaintext block size
plainBS uint64
// Ciphertext block size
cipherBS uint64
// All-zero block of size cipherBS, for fast compares
allZeroBlock []byte
// All-zero block of size IVBitLen/8, for fast compares
allZeroNonce []byte
// Force decode even if integrity check fails (openSSL only)
forceDecode bool
// Ciphertext block "sync.Pool" pool. Always returns cipherBS-sized byte
// slices (usually 4128 bytes).
cBlockPool bPool
// Plaintext block pool. Always returns plainBS-sized byte slices
// (usually 4096 bytes).
pBlockPool bPool
// Ciphertext request data pool. Always returns byte slices of size
// fuse.MAX_KERNEL_WRITE + encryption overhead.
// Used by Read() to temporarily store the ciphertext as it is read from
// disk.
CReqPool bPool
// Plaintext request data pool. Slice have size fuse.MAX_KERNEL_WRITE.
PReqPool bPool
}
// New returns an initialized ContentEnc instance.
func New(cc *cryptocore.CryptoCore, plainBS uint64, forceDecode bool) *ContentEnc {
if MAX_KERNEL_WRITE%plainBS == 0 {
cipherBS := plainBS + uint64(cc.IVLen) + cryptocore.AuthTagLen
// Take IV and GHASH overhead into account.
cReqSize := int(MAX_KERNEL_WRITE / plainBS * cipherBS)
// Unaligned reads (happens during fsck, could also happen with O_DIRECT?)
// touch one additional ciphertext and plaintext block. Reserve space for the
// extra block.
cReqSize += int(cipherBS)
pReqSize := MAX_KERNEL_WRITE + int(plainBS)
c := &ContentEnc{
cryptoCore: cc,
plainBS: plainBS,
cipherBS: cipherBS,
allZeroBlock: make([]byte, cipherBS),
allZeroNonce: make([]byte, cc.IVLen),
forceDecode: forceDecode,
cBlockPool: newBPool(int(cipherBS)),
CReqPool: newBPool(cReqSize),
pBlockPool: newBPool(int(plainBS)),
PReqPool: newBPool(pReqSize),
}
return c
} else {
return nil
}
}
// PlainBS returns the plaintext block size
func (be *ContentEnc) PlainBS() uint64 {
return be.plainBS
}
// CipherBS returns the ciphertext block size
func (be *ContentEnc) CipherBS() uint64 {
return be.cipherBS
}
// DecryptBlocks decrypts a number of blocks
func (be *ContentEnc) DecryptBlocks(ciphertext []byte, firstBlockNo uint64, fileID []byte) ([]byte, error) {
cBuf := bytes.NewBuffer(ciphertext)
var err error
pBuf := bytes.NewBuffer(be.PReqPool.Get()[:0])
blockNo := firstBlockNo
for cBuf.Len() > 0 {
cBlock := cBuf.Next(int(be.cipherBS))
var pBlock []byte
pBlock, err = be.DecryptBlock(cBlock, blockNo, fileID)
if err != nil {
if !be.forceDecode || err != stupidgcm.ErrAuth {
break
}
}
pBuf.Write(pBlock)
be.pBlockPool.Put(pBlock)
blockNo++
}
return pBuf.Bytes(), err
}
// concatAD concatenates the block number and the file ID to a byte blob
// that can be passed to AES-GCM as associated data (AD).
// Result is: aData = [blockNo.bigEndian fileID].
func concatAD(blockNo uint64, fileID []byte) (aData []byte) {
if fileID != nil && len(fileID) != headerIDLen {
// fileID is nil when decrypting the master key from the config file,
// and for symlinks and xattrs.
log.Panicf("wrong fileID length: %d", len(fileID))
}
const lenUint64 = 8
// Preallocate space to save an allocation in append()
aData = make([]byte, lenUint64, lenUint64+headerIDLen)
binary.BigEndian.PutUint64(aData, blockNo)
aData = append(aData, fileID...)
return aData
}
// DecryptBlock - Verify and decrypt GCM block
//
// Corner case: A full-sized block of all-zero ciphertext bytes is translated
// to an all-zero plaintext block, i.e. file hole passthrough.
func (be *ContentEnc) DecryptBlock(ciphertext []byte, blockNo uint64, fileID []byte) ([]byte, error) {
// Empty block?
if len(ciphertext) == 0 {
return ciphertext, nil
}
// All-zero block?
if bytes.Equal(ciphertext, be.allZeroBlock) {
return make([]byte, be.plainBS), nil
}
if len(ciphertext) < be.cryptoCore.IVLen {
return nil, errors.New("Block is too short")
}
// Extract nonce
nonce := ciphertext[:be.cryptoCore.IVLen]
if bytes.Equal(nonce, be.allZeroNonce) {
// Bug in tmpfs?
// https://github.com/rfjakob/gocryptfs/issues/56
// http://www.spinics.net/lists/kernel/msg2370127.html
return nil, errors.New("all-zero nonce")
}
ciphertext = ciphertext[be.cryptoCore.IVLen:]
// Decrypt
plaintext := be.pBlockPool.Get()
plaintext = plaintext[:0]
aData := concatAD(blockNo, fileID)
plaintext, err := be.cryptoCore.AEADCipher.Open(plaintext, nonce, ciphertext, aData)
if err != nil {
if be.forceDecode && err == stupidgcm.ErrAuth {
return plaintext, err
}
return nil, err
}
return plaintext, nil
}
// At some point, splitting the ciphertext into more groups will not improve
// performance, as spawning goroutines comes at a cost.
// 2 seems to work ok for now.
const encryptMaxSplit = 2
// encryptBlocksParallel splits the plaintext into parts and encrypts them
// in parallel.
func (be *ContentEnc) encryptBlocksParallel(plaintextBlocks [][]byte, ciphertextBlocks [][]byte, firstBlockNo uint64, fileID []byte) {
ncpu := runtime.NumCPU()
if ncpu > encryptMaxSplit {
ncpu = encryptMaxSplit
}
groupSize := len(plaintextBlocks) / ncpu
var wg sync.WaitGroup
for i := 0; i < ncpu; i++ {
wg.Add(1)
go func(i int) {
low := i * groupSize
high := (i + 1) * groupSize
if i == ncpu-1 {
// Last part picks up any left-over blocks
//
// The last part could run in the original goroutine, but
// doing that complicates the code, and, surprisingly,
// incurs a 1 % performance penalty.
high = len(plaintextBlocks)
}
be.doEncryptBlocks(plaintextBlocks[low:high], ciphertextBlocks[low:high], firstBlockNo+uint64(low), fileID)
wg.Done()
}(i)
}
wg.Wait()
}
// EncryptBlocks is like EncryptBlock but takes multiple plaintext blocks.
// Returns a byte slice from CReqPool - so don't forget to return it
// to the pool.
func (be *ContentEnc) EncryptBlocks(plaintextBlocks [][]byte, firstBlockNo uint64, fileID []byte) []byte {
ciphertextBlocks := make([][]byte, len(plaintextBlocks))
// For large writes, we parallelize encryption.
if len(plaintextBlocks) >= 32 && runtime.NumCPU() >= 2 {
be.encryptBlocksParallel(plaintextBlocks, ciphertextBlocks, firstBlockNo, fileID)
} else {
be.doEncryptBlocks(plaintextBlocks, ciphertextBlocks, firstBlockNo, fileID)
}
// Concatenate ciphertext into a single byte array.
tmp := be.CReqPool.Get()
out := bytes.NewBuffer(tmp[:0])
for _, v := range ciphertextBlocks {
out.Write(v)
// Return the memory to cBlockPool
be.cBlockPool.Put(v)
}
return out.Bytes()
}
// doEncryptBlocks is called by EncryptBlocks to do the actual encryption work
func (be *ContentEnc) doEncryptBlocks(in [][]byte, out [][]byte, firstBlockNo uint64, fileID []byte) {
for i, v := range in {
out[i] = be.EncryptBlock(v, firstBlockNo+uint64(i), fileID)
}
}
// EncryptBlock - Encrypt plaintext using a random nonce.
// blockNo and fileID are used as associated data.
// The output is nonce + ciphertext + tag.
func (be *ContentEnc) EncryptBlock(plaintext []byte, blockNo uint64, fileID []byte) []byte {
// Get a fresh random nonce
nonce := be.cryptoCore.IVGenerator.Get()
return be.doEncryptBlock(plaintext, blockNo, fileID, nonce)
}
// EncryptBlockNonce - Encrypt plaintext using a nonce chosen by the caller.
// blockNo and fileID are used as associated data.
// The output is nonce + ciphertext + tag.
// This function can only be used in SIV mode.
func (be *ContentEnc) EncryptBlockNonce(plaintext []byte, blockNo uint64, fileID []byte, nonce []byte) []byte {
if be.cryptoCore.AEADBackend != cryptocore.BackendAESSIV {
log.Panic("deterministic nonces are only secure in SIV mode")
}
return be.doEncryptBlock(plaintext, blockNo, fileID, nonce)
}
// doEncryptBlock is the backend for EncryptBlock and EncryptBlockNonce.
// blockNo and fileID are used as associated data.
// The output is nonce + ciphertext + tag.
func (be *ContentEnc) doEncryptBlock(plaintext []byte, blockNo uint64, fileID []byte, nonce []byte) []byte {
// Empty block?
if len(plaintext) == 0 {
return plaintext
}
if len(nonce) != be.cryptoCore.IVLen {
log.Panic("wrong nonce length")
}
// Block is authenticated with block number and file ID
aData := concatAD(blockNo, fileID)
// Get a cipherBS-sized block of memory, copy the nonce into it and truncate to
// nonce length
cBlock := be.cBlockPool.Get()
copy(cBlock, nonce)
cBlock = cBlock[0:len(nonce)]
// Encrypt plaintext and append to nonce
ciphertext := be.cryptoCore.AEADCipher.Seal(cBlock, nonce, plaintext, aData)
overhead := int(be.cipherBS - be.plainBS)
if len(plaintext)+overhead != len(ciphertext) {
log.Panicf("unexpected ciphertext length: plaintext=%d, overhead=%d, ciphertext=%d",
len(plaintext), overhead, len(ciphertext))
}
return ciphertext
}
// MergeBlocks - Merge newData into oldData at offset
// New block may be bigger than both newData and oldData
func (be *ContentEnc) MergeBlocks(oldData []byte, newData []byte, offset int) []byte {
// Fastpath for small-file creation
if len(oldData) == 0 && offset == 0 {
return newData
}
// Make block of maximum size
out := make([]byte, be.plainBS)
// Copy old and new data into it
copy(out, oldData)
l := len(newData)
copy(out[offset:offset+l], newData)
// Crop to length
outLen := len(oldData)
newLen := offset + len(newData)
if outLen < newLen {
outLen = newLen
}
return out[0:outLen]
}
// Wipe tries to wipe secret keys from memory by overwriting them with zeros
// and/or setting references to nil.
func (be *ContentEnc) Wipe() {
be.cryptoCore.Wipe()
be.cryptoCore = nil
}

77
app/libgocryptfs/rewrites/contentenc/file_header.go Normal file
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package contentenc
// Per-file header
//
// Format: [ "Version" uint16 big endian ] [ "Id" 16 random bytes ]
import (
"bytes"
"encoding/binary"
"encoding/hex"
"fmt"
"log"
"../../gocryptfs_internal/cryptocore"
)
const (
// CurrentVersion is the current On-Disk-Format version
CurrentVersion = 2
headerVersionLen = 2 // uint16
headerIDLen = 16 // 128 bit random file id
// HeaderLen is the total header length
HeaderLen = headerVersionLen + headerIDLen
)
// FileHeader represents the header stored on each non-empty file.
type FileHeader struct {
Version uint16
ID []byte
}
// Pack - serialize fileHeader object
func (h *FileHeader) Pack() []byte {
if len(h.ID) != headerIDLen || h.Version != CurrentVersion {
log.Panic("FileHeader object not properly initialized")
}
buf := make([]byte, HeaderLen)
binary.BigEndian.PutUint16(buf[0:headerVersionLen], h.Version)
copy(buf[headerVersionLen:], h.ID)
return buf
}
// allZeroFileID is preallocated to quickly check if the data read from disk is all zero
var allZeroFileID = make([]byte, headerIDLen)
var allZeroHeader = make([]byte, HeaderLen)
// ParseHeader - parse "buf" into fileHeader object
func ParseHeader(buf []byte) (*FileHeader, error) {
if len(buf) != HeaderLen {
return nil, fmt.Errorf("ParseHeader: invalid length, want=%d have=%d", HeaderLen, len(buf))
}
if bytes.Equal(buf, allZeroHeader) {
return nil, fmt.Errorf("ParseHeader: header is all-zero. Header hexdump: %s", hex.EncodeToString(buf))
}
var h FileHeader
h.Version = binary.BigEndian.Uint16(buf[0:headerVersionLen])
if h.Version != CurrentVersion {
return nil, fmt.Errorf("ParseHeader: invalid version, want=%d have=%d. Header hexdump: %s",
CurrentVersion, h.Version, hex.EncodeToString(buf))
}
h.ID = buf[headerVersionLen:]
if bytes.Equal(h.ID, allZeroFileID) {
return nil, fmt.Errorf("ParseHeader: file id is all-zero. Header hexdump: %s",
hex.EncodeToString(buf))
}
return &h, nil
}
// RandomHeader - create new fileHeader object with random Id
func RandomHeader() *FileHeader {
var h FileHeader
h.Version = CurrentVersion
h.ID = cryptocore.RandBytes(headerIDLen)
return &h
}

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app/libgocryptfs/rewrites/contentenc/intrablock.go Normal file
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package contentenc
// IntraBlock identifies a part of a file block
type IntraBlock struct {
// BlockNo is the block number in the file
BlockNo uint64
// Skip is an offset into the block payload
// In forward mode: block plaintext
// In reverse mode: offset into block ciphertext. Takes the header into
// account.
Skip uint64
// Length of payload data in this block
// In forward mode: length of the plaintext
// In reverse mode: length of the ciphertext. Takes header and trailer into
// account.
Length uint64
fs *ContentEnc
}
// IsPartial - is the block partial? This means we have to do read-modify-write.
func (ib *IntraBlock) IsPartial() bool {
if ib.Skip > 0 || ib.Length < ib.fs.plainBS {
return true
}
return false
}
// BlockCipherOff returns the ciphertext offset corresponding to BlockNo
func (ib *IntraBlock) BlockCipherOff() (offset uint64) {
return ib.fs.BlockNoToCipherOff(ib.BlockNo)
}
// BlockPlainOff returns the plaintext offset corresponding to BlockNo
func (ib *IntraBlock) BlockPlainOff() (offset uint64) {
return ib.fs.BlockNoToPlainOff(ib.BlockNo)
}
// CropBlock - crop a potentially larger plaintext block down to the relevant part
func (ib *IntraBlock) CropBlock(d []byte) []byte {
lenHave := len(d)
lenWant := int(ib.Skip + ib.Length)
if lenHave < lenWant {
return d[ib.Skip:lenHave]
}
return d[ib.Skip:lenWant]
}
// JointCiphertextRange is the ciphertext range corresponding to the sum of all
// "blocks" (complete blocks)
func (ib *IntraBlock) JointCiphertextRange(blocks []IntraBlock) (offset uint64, length uint64) {
firstBlock := blocks[0]
lastBlock := blocks[len(blocks)-1]
offset = ib.fs.BlockNoToCipherOff(firstBlock.BlockNo)
offsetLast := ib.fs.BlockNoToCipherOff(lastBlock.BlockNo)
length = offsetLast + ib.fs.cipherBS - offset
return offset, length
}
// JointPlaintextRange is the plaintext range corresponding to the sum of all
// "blocks" (complete blocks)
func JointPlaintextRange(blocks []IntraBlock) (offset uint64, length uint64) {
firstBlock := blocks[0]
lastBlock := blocks[len(blocks)-1]
offset = firstBlock.BlockPlainOff()
length = lastBlock.BlockPlainOff() + lastBlock.fs.PlainBS() - offset
return offset, length
}

135
app/libgocryptfs/rewrites/contentenc/offsets.go Normal file
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package contentenc
import (
"log"
)
// Contentenc methods that translate offsets between ciphertext and plaintext
// PlainOffToBlockNo converts a plaintext offset to the ciphertext block number.
func (be *ContentEnc) PlainOffToBlockNo(plainOffset uint64) uint64 {
return plainOffset / be.plainBS
}
// CipherOffToBlockNo converts the ciphertext offset to the plaintext block number.
func (be *ContentEnc) CipherOffToBlockNo(cipherOffset uint64) uint64 {
if cipherOffset < HeaderLen {
log.Panicf("BUG: offset %d is inside the file header", cipherOffset)
}
return (cipherOffset - HeaderLen) / be.cipherBS
}
// BlockNoToCipherOff gets the ciphertext offset of block "blockNo"
func (be *ContentEnc) BlockNoToCipherOff(blockNo uint64) uint64 {
return HeaderLen + blockNo*be.cipherBS
}
// BlockNoToPlainOff gets the plaintext offset of block "blockNo"
func (be *ContentEnc) BlockNoToPlainOff(blockNo uint64) uint64 {
return blockNo * be.plainBS
}
// CipherSizeToPlainSize calculates the plaintext size from a ciphertext size
func (be *ContentEnc) CipherSizeToPlainSize(cipherSize uint64) uint64 {
// Zero-sized files stay zero-sized
if cipherSize == 0 {
return 0
}
if cipherSize == HeaderLen {
// This can happen between createHeader() and Write() and is harmless.
return 0
}
if cipherSize < HeaderLen {
return 0
}
// Block number at last byte
blockNo := be.CipherOffToBlockNo(cipherSize - 1)
blockCount := blockNo + 1
overhead := be.BlockOverhead()*blockCount + HeaderLen
if overhead > cipherSize {
return 0
}
return cipherSize - overhead
}
// PlainSizeToCipherSize calculates the ciphertext size from a plaintext size
func (be *ContentEnc) PlainSizeToCipherSize(plainSize uint64) uint64 {
// Zero-sized files stay zero-sized
if plainSize == 0 {
return 0
}
// Block number at last byte
blockNo := be.PlainOffToBlockNo(plainSize - 1)
blockCount := blockNo + 1
overhead := be.BlockOverhead()*blockCount + HeaderLen
return plainSize + overhead
}
// ExplodePlainRange splits a plaintext byte range into (possibly partial) blocks
// Returns an empty slice if length == 0.
func (be *ContentEnc) ExplodePlainRange(offset uint64, length uint64) []IntraBlock {
var blocks []IntraBlock
var nextBlock IntraBlock
nextBlock.fs = be
for length > 0 {
nextBlock.BlockNo = be.PlainOffToBlockNo(offset)
nextBlock.Skip = offset - be.BlockNoToPlainOff(nextBlock.BlockNo)
// Minimum of remaining plaintext data and remaining space in the block
nextBlock.Length = MinUint64(length, be.plainBS-nextBlock.Skip)
blocks = append(blocks, nextBlock)
offset += nextBlock.Length
length -= nextBlock.Length
}
return blocks
}
// ExplodeCipherRange splits a ciphertext byte range into (possibly partial)
// blocks This is used in reverse mode when reading files
func (be *ContentEnc) ExplodeCipherRange(offset uint64, length uint64) []IntraBlock {
var blocks []IntraBlock
var nextBlock IntraBlock
nextBlock.fs = be
for length > 0 {
nextBlock.BlockNo = be.CipherOffToBlockNo(offset)
nextBlock.Skip = offset - be.BlockNoToCipherOff(nextBlock.BlockNo)
// This block can carry up to "maxLen" payload bytes
maxLen := be.cipherBS - nextBlock.Skip
nextBlock.Length = maxLen
// But if the user requested less, we truncate the block to "length".
if length < maxLen {
nextBlock.Length = length
}
blocks = append(blocks, nextBlock)
offset += nextBlock.Length
length -= nextBlock.Length
}
return blocks
}
// BlockOverhead returns the per-block overhead.
func (be *ContentEnc) BlockOverhead() uint64 {
return be.cipherBS - be.plainBS
}
// MinUint64 returns the minimum of two uint64 values.
func MinUint64(x uint64, y uint64) uint64 {
if x < y {
return x
}
return y
}

29
app/libgocryptfs/rewrites/syscallcompat/emulate.go Normal file
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package syscallcompat
import (
"path/filepath"
"sync"
"syscall"
)
var chdirMutex sync.Mutex
// emulateMknodat emulates the syscall for platforms that don't have it
// in the kernel (darwin).
func emulateMknodat(dirfd int, path string, mode uint32, dev int) error {
if !filepath.IsAbs(path) {
chdirMutex.Lock()
defer chdirMutex.Unlock()
cwd, err := syscall.Open(".", syscall.O_RDONLY, 0)
if err != nil {
return err
}
defer syscall.Close(cwd)
err = syscall.Fchdir(dirfd)
if err != nil {
return err
}
defer syscall.Fchdir(cwd)
}
return syscall.Mknod(path, mode, dev)
}

151
app/libgocryptfs/rewrites/syscallcompat/getdents_linux.go Normal file
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// +build linux
package syscallcompat
// Other implementations of getdents in Go:
// https://github.com/ericlagergren/go-gnulib/blob/cb7a6e136427e242099b2c29d661016c19458801/dirent/getdents_unix.go
// https://github.com/golang/tools/blob/5831d16d18029819d39f99bdc2060b8eff410b6b/imports/fastwalk_unix.go
import (
"sync"
"bytes"
"syscall"
"unsafe"
"golang.org/x/sys/unix"
)
const sizeofDirent = int(unsafe.Sizeof(unix.Dirent{}))
// maxReclen sanity check: Reclen should never be larger than this.
// Due to padding between entries, it is 280 even on 32-bit architectures.
// See https://github.com/rfjakob/gocryptfs/issues/197 for details.
const maxReclen = 280
type DirEntry struct {
Name string
Mode uint32
}
// getdents wraps unix.Getdents and converts the result to []fuse.DirEntry.
func getdents(fd int) ([]DirEntry, error) {
// Collect syscall result in smartBuf.
// "bytes.Buffer" is smart about expanding the capacity and avoids the
// exponential runtime of simple append().
var smartBuf bytes.Buffer
tmp := make([]byte, 10000)
for {
n, err := unix.Getdents(fd, tmp)
// unix.Getdents has been observed to return EINTR on cifs mounts
if err == unix.EINTR {
if n > 0 {
smartBuf.Write(tmp[:n])
}
continue
} else if err != nil {
if smartBuf.Len() > 0 {
return nil, syscall.EIO
}
return nil, err
}
if n == 0 {
break
}
smartBuf.Write(tmp[:n])
}
// Make sure we have at least Sizeof(Dirent) of zeros after the last
// entry. This prevents a cast to Dirent from reading past the buffer.
smartBuf.Grow(sizeofDirent)
buf := smartBuf.Bytes()
// Count the number of directory entries in the buffer so we can allocate
// a fuse.DirEntry slice of the correct size at once.
var numEntries, offset int
for offset < len(buf) {
s := *(*unix.Dirent)(unsafe.Pointer(&buf[offset]))
if s.Reclen == 0 {
// EBADR = Invalid request descriptor
return nil, syscall.EBADR
}
if int(s.Reclen) > maxReclen {
return nil, syscall.EBADR
}
offset += int(s.Reclen)
numEntries++
}
// Parse the buffer into entries.
// Note: syscall.ParseDirent() only returns the names,
// we want all the data, so we have to implement
// it on our own.
entries := make([]DirEntry, 0, numEntries)
offset = 0
for offset < len(buf) {
s := *(*unix.Dirent)(unsafe.Pointer(&buf[offset]))
name, err := getdentsName(s)
if err != nil {
return nil, err
}
offset += int(s.Reclen)
if name == "." || name == ".." {
// os.File.Readdir() drops "." and "..". Let's be compatible.
continue
}
mode, err := convertDType(fd, name, s.Type)
if err != nil {
// The uint32file may have been deleted in the meantime. Just skip it
// and go on.
continue
}
entries = append(entries, DirEntry{
Name: name,
Mode: mode,
})
}
return entries, nil
}
// getdentsName extracts the filename from a Dirent struct and returns it as
// a Go string.
func getdentsName(s unix.Dirent) (string, error) {
// After the loop, l contains the index of the first '\0'.
l := 0
for l = range s.Name {
if s.Name[l] == 0 {
break
}
}
if l < 1 {
// EBADR = Invalid request descriptor
return "", syscall.EBADR
}
// Copy to byte slice.
name := make([]byte, l)
for i := range name {
name[i] = byte(s.Name[i])
}
return string(name), nil
}
var dtUnknownWarnOnce sync.Once
func dtUnknownWarn(dirfd int) {
const XFS_SUPER_MAGIC = 0x58465342 // From man 2 statfs
var buf syscall.Statfs_t
syscall.Fstatfs(dirfd, &buf)
}
// convertDType converts a Dirent.Type to at Stat_t.Mode value.
func convertDType(dirfd int, name string, dtype uint8) (uint32, error) {
if dtype != syscall.DT_UNKNOWN {
// Shift up by four octal digits = 12 bits
return uint32(dtype) << 12, nil
}
// DT_UNKNOWN: we have to call stat()
dtUnknownWarnOnce.Do(func() { dtUnknownWarn(dirfd) })
var st unix.Stat_t
err := Fstatat(dirfd, name, &st, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
return 0, err
}
// The S_IFMT bit mask extracts the file type from the mode.
return st.Mode & syscall.S_IFMT, nil
}

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package syscallcompat

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app/libgocryptfs/rewrites/syscallcompat/helpers.go Normal file
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package syscallcompat
import (
"os"
"syscall"
)
// IsENOSPC tries to find out if "err" is a (potentially wrapped) ENOSPC error.
func IsENOSPC(err error) bool {
// syscallcompat.EnospcPrealloc returns the naked syscall error
if err == syscall.ENOSPC {
return true
}
// os.File.WriteAt returns &PathError
if err2, ok := err.(*os.PathError); ok {
if err2.Err == syscall.ENOSPC {
return true
}
}
return false
}

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app/libgocryptfs/rewrites/syscallcompat/open_nofollow.go Normal file
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package syscallcompat
import (
"path/filepath"
"strings"
"syscall"
)
// OpenDirNofollow opens the dir at "relPath" in a way that is secure against
// symlink attacks. Symlinks that are part of "relPath" are never followed.
// This function is implemented by walking the directory tree, starting at
// "baseDir", using the Openat syscall with the O_NOFOLLOW flag.
// Symlinks that are part of the "baseDir" path are followed.
func OpenDirNofollow(baseDir string, relPath string) (fd int, err error) {
if !filepath.IsAbs(baseDir) {
return -1, syscall.EINVAL
}
if filepath.IsAbs(relPath) {
return -1, syscall.EINVAL
}
// Open the base dir (following symlinks)
dirfd, err := syscall.Open(baseDir, syscall.O_DIRECTORY|O_PATH, 0)
if err != nil {
return -1, err
}
// Caller wanted to open baseDir itself?
if relPath == "" {
return dirfd, nil
}
// Split the path into components
parts := strings.Split(relPath, "/")
// Walk the directory tree
var dirfd2 int
for _, name := range parts {
dirfd2, err = Openat(dirfd, name, syscall.O_NOFOLLOW|syscall.O_DIRECTORY|O_PATH, 0)
syscall.Close(dirfd)
if err != nil {
return -1, err
}
dirfd = dirfd2
}
// Return fd to final directory
return dirfd, nil
}

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package syscallcompat
import (
"bytes"
"syscall"
"golang.org/x/sys/unix"
)
// PATH_MAX is the maximum allowed path length on Linux.
// It is not defined on Darwin, so we use the Linux value.
const PATH_MAX = 4096
// Readlinkat is a convenience wrapper around unix.Readlinkat() that takes
// care of buffer sizing. Implemented like os.Readlink().
func Readlinkat(dirfd int, path string) (string, error) {
// Allocate the buffer exponentially like os.Readlink does.
for bufsz := 128; ; bufsz *= 2 {
buf := make([]byte, bufsz)
n, err := unix.Readlinkat(dirfd, path, buf)
if err != nil {
return "", err
}
if n < bufsz {
return string(buf[0:n]), nil
}
}
}
// Faccessat exists both in Linux and in MacOS 10.10+, but the Linux version
// DOES NOT support any flags. Emulate AT_SYMLINK_NOFOLLOW like glibc does.
func Faccessat(dirfd int, path string, mode uint32) error {
var st unix.Stat_t
err := Fstatat(dirfd, path, &st, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
return err
}
if st.Mode&syscall.S_IFMT == syscall.S_IFLNK {
// Pretend that a symlink is always accessible
return nil
}
return unix.Faccessat(dirfd, path, mode, 0)
}
// Openat wraps the Openat syscall.
func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) {
if flags&syscall.O_CREAT != 0 {
// O_CREAT should be used with O_EXCL. O_NOFOLLOW has no effect with O_EXCL.
if flags&syscall.O_EXCL == 0 {
flags |= syscall.O_EXCL
}
} else {
// If O_CREAT is not used, we should use O_NOFOLLOW
if flags&syscall.O_NOFOLLOW == 0 {
flags |= syscall.O_NOFOLLOW
}
}
return unix.Openat(dirfd, path, flags, mode)
}
// Renameat wraps the Renameat syscall.
func Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) {
return unix.Renameat(olddirfd, oldpath, newdirfd, newpath)
}
// Unlinkat syscall.
func Unlinkat(dirfd int, path string, flags int) (err error) {
return unix.Unlinkat(dirfd, path, flags)
}
// Fchownat syscall.
func Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error) {
// Why would we ever want to call this without AT_SYMLINK_NOFOLLOW?
if flags&unix.AT_SYMLINK_NOFOLLOW == 0 {
flags |= unix.AT_SYMLINK_NOFOLLOW
}
return unix.Fchownat(dirfd, path, uid, gid, flags)
}
// Linkat exists both in Linux and in MacOS 10.10+.
func Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error) {
return unix.Linkat(olddirfd, oldpath, newdirfd, newpath, flags)
}
// Symlinkat syscall.
func Symlinkat(oldpath string, newdirfd int, newpath string) (err error) {
return unix.Symlinkat(oldpath, newdirfd, newpath)
}
// Mkdirat syscall.
func Mkdirat(dirfd int, path string, mode uint32) (err error) {
return unix.Mkdirat(dirfd, path, mode)
}
// Fstatat syscall.
func Fstatat(dirfd int, path string, stat *unix.Stat_t, flags int) (err error) {
// Why would we ever want to call this without AT_SYMLINK_NOFOLLOW?
if flags&unix.AT_SYMLINK_NOFOLLOW == 0 {
flags |= unix.AT_SYMLINK_NOFOLLOW
}
return unix.Fstatat(dirfd, path, stat, flags)
}
const XATTR_SIZE_MAX = 65536
// Make the buffer 1kB bigger so we can detect overflows
const XATTR_BUFSZ = XATTR_SIZE_MAX + 1024
// Fgetxattr is a wrapper around unix.Fgetxattr that handles the buffer sizing.
func Fgetxattr(fd int, attr string) (val []byte, err error) {
// If the buffer is too small to fit the value, Linux and MacOS react
// differently:
// Linux: returns an ERANGE error and "-1" bytes.
// MacOS: truncates the value and returns "size" bytes.
//
// We choose the simple approach of buffer that is bigger than the limit on
// Linux, and return an error for everything that is bigger (which can
// only happen on MacOS).
//
// See https://github.com/pkg/xattr for a smarter solution.
// TODO: smarter buffer sizing?
buf := make([]byte, XATTR_BUFSZ)
sz, err := unix.Fgetxattr(fd, attr, buf)
if err == syscall.ERANGE {
// Do NOT return ERANGE - the user might retry ad inifinitum!
return nil, syscall.EOVERFLOW
}
if err != nil {
return nil, err
}
if sz >= XATTR_SIZE_MAX {
return nil, syscall.EOVERFLOW
}
// Copy only the actually used bytes to a new (smaller) buffer
// so "buf" never leaves the function and can be allocated on the stack.
val = make([]byte, sz)
copy(val, buf)
return val, nil
}
// Lgetxattr is a wrapper around unix.Lgetxattr that handles the buffer sizing.
func Lgetxattr(path string, attr string) (val []byte, err error) {
// See the buffer sizing comments in Fgetxattr.
// TODO: smarter buffer sizing?
buf := make([]byte, XATTR_BUFSZ)
sz, err := unix.Lgetxattr(path, attr, buf)
if err == syscall.ERANGE {
// Do NOT return ERANGE - the user might retry ad inifinitum!
return nil, syscall.EOVERFLOW
}
if err != nil {
return nil, err
}
if sz >= XATTR_SIZE_MAX {
return nil, syscall.EOVERFLOW
}
// Copy only the actually used bytes to a new (smaller) buffer
// so "buf" never leaves the function and can be allocated on the stack.
val = make([]byte, sz)
copy(val, buf)
return val, nil
}
// Flistxattr is a wrapper for unix.Flistxattr that handles buffer sizing and
// parsing the returned blob to a string slice.
func Flistxattr(fd int) (attrs []string, err error) {
// See the buffer sizing comments in Fgetxattr.
// TODO: smarter buffer sizing?
buf := make([]byte, XATTR_BUFSZ)
sz, err := unix.Flistxattr(fd, buf)
if err == syscall.ERANGE {
// Do NOT return ERANGE - the user might retry ad inifinitum!
return nil, syscall.EOVERFLOW
}
if err != nil {
return nil, err
}
if sz >= XATTR_SIZE_MAX {
return nil, syscall.EOVERFLOW
}
attrs = parseListxattrBlob(buf[:sz])
return attrs, nil
}
// Llistxattr is a wrapper for unix.Llistxattr that handles buffer sizing and
// parsing the returned blob to a string slice.
func Llistxattr(path string) (attrs []string, err error) {
// TODO: smarter buffer sizing?
buf := make([]byte, XATTR_BUFSZ)
sz, err := unix.Llistxattr(path, buf)
if err == syscall.ERANGE {
// Do NOT return ERANGE - the user might retry ad inifinitum!
return nil, syscall.EOVERFLOW
}
if err != nil {
return nil, err
}
if sz >= XATTR_SIZE_MAX {
return nil, syscall.EOVERFLOW
}
attrs = parseListxattrBlob(buf[:sz])
return attrs, nil
}
func parseListxattrBlob(buf []byte) (attrs []string) {
parts := bytes.Split(buf, []byte{0})
for _, part := range parts {
if len(part) == 0 {
// Last part is empty, ignore
continue
}
attrs = append(attrs, string(part))
}
return attrs
}

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package syscallcompat
import (
"log"
"path/filepath"
"runtime"
"syscall"
"time"
"unsafe"
"golang.org/x/sys/unix"
)
const (
// O_DIRECT means oncached I/O on Linux. No direct equivalent on MacOS and defined
// to zero there.
O_DIRECT = 0
// O_PATH is only defined on Linux
O_PATH = 0
// KAUTH_UID_NONE and KAUTH_GID_NONE are special values to
// revert permissions to the process credentials.
KAUTH_UID_NONE = ^uint32(0) - 100
KAUTH_GID_NONE = ^uint32(0) - 100
)
// Unfortunately pthread_setugid_np does not have a syscall wrapper yet.
func pthread_setugid_np(uid uint32, gid uint32) (err error) {
_, _, e1 := syscall.RawSyscall(syscall.SYS_SETTID, uintptr(uid), uintptr(gid), 0)
if e1 != 0 {
err = e1
}
return
}
// Unfortunately fsetattrlist does not have a syscall wrapper yet.
func fsetattrlist(fd int, list unsafe.Pointer, buf unsafe.Pointer, size uintptr, options int) (err error) {
_, _, e1 := syscall.Syscall6(syscall.SYS_FSETATTRLIST, uintptr(fd), uintptr(list), uintptr(buf), uintptr(size), uintptr(options), 0)
if e1 != 0 {
err = e1
}
return
}
// Setattrlist already has a syscall wrapper, but it is not exported.
func setattrlist(path *byte, list unsafe.Pointer, buf unsafe.Pointer, size uintptr, options int) (err error) {
_, _, e1 := syscall.Syscall6(syscall.SYS_SETATTRLIST, uintptr(unsafe.Pointer(path)), uintptr(list), uintptr(buf), uintptr(size), uintptr(options), 0)
if e1 != 0 {
err = e1
}
return
}
// Sorry, fallocate is not available on OSX at all and
// fcntl F_PREALLOCATE is not accessible from Go.
// See https://github.com/rfjakob/gocryptfs/issues/18 if you want to help.
func EnospcPrealloc(fd int, off int64, len int64) error {
return nil
}
// See above.
func Fallocate(fd int, mode uint32, off int64, len int64) error {
return syscall.EOPNOTSUPP
}
// Dup3 is not available on Darwin, so we use Dup2 instead.
func Dup3(oldfd int, newfd int, flags int) (err error) {
if flags != 0 {
log.Panic("darwin does not support dup3 flags")
}
return syscall.Dup2(oldfd, newfd)
}
////////////////////////////////////////////////////////
//// Emulated Syscalls (see emulate.go) ////////////////
////////////////////////////////////////////////////////
func OpenatUser(dirfd int, path string, flags int, mode uint32, context *fuse.Context) (fd int, err error) {
if context != nil {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
err = pthread_setugid_np(context.Owner.Uid, context.Owner.Gid)
if err != nil {
return -1, err
}
defer pthread_setugid_np(KAUTH_UID_NONE, KAUTH_GID_NONE)
}
return Openat(dirfd, path, flags, mode)
}
func Mknodat(dirfd int, path string, mode uint32, dev int) (err error) {
return emulateMknodat(dirfd, path, mode, dev)
}
func MknodatUser(dirfd int, path string, mode uint32, dev int, context *fuse.Context) (err error) {
if context != nil {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
err = pthread_setugid_np(context.Owner.Uid, context.Owner.Gid)
if err != nil {
return err
}
defer pthread_setugid_np(KAUTH_UID_NONE, KAUTH_GID_NONE)
}
return Mknodat(dirfd, path, mode, dev)
}
func FchmodatNofollow(dirfd int, path string, mode uint32) (err error) {
return unix.Fchmodat(dirfd, path, mode, unix.AT_SYMLINK_NOFOLLOW)
}
func SymlinkatUser(oldpath string, newdirfd int, newpath string, context *fuse.Context) (err error) {
if context != nil {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
err = pthread_setugid_np(context.Owner.Uid, context.Owner.Gid)
if err != nil {
return err
}
defer pthread_setugid_np(KAUTH_UID_NONE, KAUTH_GID_NONE)
}
return Symlinkat(oldpath, newdirfd, newpath)
}
func MkdiratUser(dirfd int, path string, mode uint32, context *fuse.Context) (err error) {
if context != nil {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
err = pthread_setugid_np(context.Owner.Uid, context.Owner.Gid)
if err != nil {
return err
}
defer pthread_setugid_np(KAUTH_UID_NONE, KAUTH_GID_NONE)
}
return Mkdirat(dirfd, path, mode)
}
type attrList struct {
bitmapCount uint16
_ uint16
CommonAttr uint32
VolAttr uint32
DirAttr uint32
FileAttr uint32
Forkattr uint32
}
func timesToAttrList(a *time.Time, m *time.Time) (attrList attrList, attributes [2]unix.Timespec) {
attrList.bitmapCount = unix.ATTR_BIT_MAP_COUNT
attrList.CommonAttr = 0
i := 0
if m != nil {
attributes[i] = unix.Timespec(fuse.UtimeToTimespec(m))
attrList.CommonAttr |= unix.ATTR_CMN_MODTIME
i += 1
}
if a != nil {
attributes[i] = unix.Timespec(fuse.UtimeToTimespec(a))
attrList.CommonAttr |= unix.ATTR_CMN_ACCTIME
i += 1
}
return attrList, attributes
}
// FutimesNano syscall.
func FutimesNano(fd int, a *time.Time, m *time.Time) (err error) {
attrList, attributes := timesToAttrList(a, m)
return fsetattrlist(fd, unsafe.Pointer(&attrList), unsafe.Pointer(&attributes),
unsafe.Sizeof(attributes), 0)
}
// UtimesNanoAtNofollow is like UtimesNanoAt but never follows symlinks.
//
// Unfortunately we cannot use unix.UtimesNanoAt since it is broken and just
// ignores the provided 'dirfd'. In addition, it also lacks handling of 'nil'
// pointers (used to preserve one of both timestamps).
func UtimesNanoAtNofollow(dirfd int, path string, a *time.Time, m *time.Time) (err error) {
if !filepath.IsAbs(path) {
chdirMutex.Lock()
defer chdirMutex.Unlock()
var cwd int
cwd, err = syscall.Open(".", syscall.O_RDONLY, 0)
if err != nil {
return err
}
defer syscall.Close(cwd)
err = syscall.Fchdir(dirfd)
if err != nil {
return err
}
defer syscall.Fchdir(cwd)
}
_p0, err := syscall.BytePtrFromString(path)
if err != nil {
return err
}
attrList, attributes := timesToAttrList(a, m)
return setattrlist(_p0, unsafe.Pointer(&attrList), unsafe.Pointer(&attributes),
unsafe.Sizeof(attributes), unix.FSOPT_NOFOLLOW)
}
func Getdents(fd int) ([]fuse.DirEntry, error) {
return emulateGetdents(fd)
}

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// Package syscallcompat wraps Linux-specific syscalls.
package syscallcompat
import (
"fmt"
"io/ioutil"
"strconv"
"strings"
"sync"
"syscall"
"time"
"golang.org/x/sys/unix"
)
const (
_FALLOC_FL_KEEP_SIZE = 0x01
// O_DIRECT means oncached I/O on Linux. No direct equivalent on MacOS and defined
// to zero there.
O_DIRECT = syscall.O_DIRECT
// O_PATH is only defined on Linux
O_PATH = unix.O_PATH
)
var preallocWarn sync.Once
// EnospcPrealloc preallocates ciphertext space without changing the file
// size. This guarantees that we don't run out of space while writing a
// ciphertext block (that would corrupt the block).
func EnospcPrealloc(fd int, off int64, len int64) (err error) {
for {
err = syscall.Fallocate(fd, _FALLOC_FL_KEEP_SIZE, off, len)
if err == syscall.EINTR {
// fallocate, like many syscalls, can return EINTR. This is not an
// error and just signifies that the operation was interrupted by a
// signal and we should try again.
continue
}
if err == syscall.EOPNOTSUPP {
// ZFS and ext3 do not support fallocate. Warn but continue anyway.
// https://github.com/rfjakob/gocryptfs/issues/22
preallocWarn.Do(func() {})
return nil
}
return err
}
}
// Fallocate wraps the Fallocate syscall.
func Fallocate(fd int, mode uint32, off int64, len int64) (err error) {
return syscall.Fallocate(fd, mode, off, len)
}
func getSupplementaryGroups(pid uint32) (gids []int) {
procPath := fmt.Sprintf("/proc/%d/task/%d/status", pid, pid)
blob, err := ioutil.ReadFile(procPath)
if err != nil {
return nil
}
lines := strings.Split(string(blob), "\n")
for _, line := range lines {
if strings.HasPrefix(line, "Groups:") {
f := strings.Fields(line[7:])
gids = make([]int, len(f))
for i := range gids {
val, err := strconv.ParseInt(f[i], 10, 32)
if err != nil {
return nil
}
gids[i] = int(val)
}
return gids
}
}
return nil
}
// Mknodat wraps the Mknodat syscall.
func Mknodat(dirfd int, path string, mode uint32, dev int) (err error) {
return syscall.Mknodat(dirfd, path, mode, dev)
}
// Dup3 wraps the Dup3 syscall. We want to use Dup3 rather than Dup2 because Dup2
// is not implemented on arm64.
func Dup3(oldfd int, newfd int, flags int) (err error) {
return syscall.Dup3(oldfd, newfd, flags)
}
// FchmodatNofollow is like Fchmodat but never follows symlinks.
//
// This should be handled by the AT_SYMLINK_NOFOLLOW flag, but Linux
// does not implement it, so we have to perform an elaborate dance
// with O_PATH and /proc/self/fd.
//
// See also: Qemu implemented the same logic as fchmodat_nofollow():
// https://git.qemu.org/?p=qemu.git;a=blob;f=hw/9pfs/9p-local.c#l335
func FchmodatNofollow(dirfd int, path string, mode uint32) (err error) {
// Open handle to the filename (but without opening the actual file).
// This succeeds even when we don't have read permissions to the file.
fd, err := syscall.Openat(dirfd, path, syscall.O_NOFOLLOW|O_PATH, 0)
if err != nil {
return err
}
defer syscall.Close(fd)
// Now we can check the type without the risk of race-conditions.
// Return syscall.ELOOP if it is a symlink.
var st syscall.Stat_t
err = syscall.Fstat(fd, &st)
if err != nil {
return err
}
if st.Mode&syscall.S_IFMT == syscall.S_IFLNK {
return syscall.ELOOP
}
// Change mode of the actual file. Fchmod does not work with O_PATH,
// but Chmod via /proc/self/fd works.
procPath := fmt.Sprintf("/proc/self/fd/%d", fd)
return syscall.Chmod(procPath, mode)
}
func timesToTimespec(a *time.Time, m *time.Time) []unix.Timespec {
ts := make([]unix.Timespec, 2)
ta, _ := unix.TimeToTimespec(*a)
ts[0] = unix.Timespec(ta)
tm, _ := unix.TimeToTimespec(*m)
ts[1] = unix.Timespec(tm)
return ts
}
// FutimesNano syscall.
func FutimesNano(fd int, a *time.Time, m *time.Time) (err error) {
ts := timesToTimespec(a, m)
// To avoid introducing a separate syscall wrapper for futimens()
// (as done in go-fuse, for example), we instead use the /proc/self/fd trick.
procPath := fmt.Sprintf("/proc/self/fd/%d", fd)
return unix.UtimesNanoAt(unix.AT_FDCWD, procPath, ts, 0)
}
// UtimesNanoAtNofollow is like UtimesNanoAt but never follows symlinks.
func UtimesNanoAtNofollow(dirfd int, path string, a *time.Time, m *time.Time) (err error) {
ts := timesToTimespec(a, m)
return unix.UtimesNanoAt(dirfd, path, ts, unix.AT_SYMLINK_NOFOLLOW)
}
func Getdents(fd int) ([]DirEntry, error) {
return getdents(fd)
}

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app/libgocryptfs/rewrites/syscallcompat/unix2syscall_darwin.go Normal file
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package syscallcompat
import (
"syscall"
"golang.org/x/sys/unix"
)
// Unix2syscall converts a unix.Stat_t struct to a syscall.Stat_t struct.
func Unix2syscall(u unix.Stat_t) syscall.Stat_t {
return syscall.Stat_t{
Dev: u.Dev,
Ino: u.Ino,
Nlink: u.Nlink,
Mode: u.Mode,
Uid: u.Uid,
Gid: u.Gid,
Rdev: u.Rdev,
Size: u.Size,
Blksize: u.Blksize,
Blocks: u.Blocks,
Atimespec: syscall.Timespec(u.Atim),
Mtimespec: syscall.Timespec(u.Mtim),
Ctimespec: syscall.Timespec(u.Ctim),
}
}

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app/libgocryptfs/rewrites/syscallcompat/unix2syscall_linux.go Normal file
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package syscallcompat
import (
"syscall"
"golang.org/x/sys/unix"
)
// Unix2syscall converts a unix.Stat_t struct to a syscall.Stat_t struct.
// A direct cast does not work because the padding is named differently in
// unix.Stat_t for some reason ("X__unused" in syscall, "_" in unix).
func Unix2syscall(u unix.Stat_t) syscall.Stat_t {
return syscall.Stat_t{
Dev: u.Dev,
Ino: u.Ino,
Nlink: u.Nlink,
Mode: u.Mode,
Uid: u.Uid,
Gid: u.Gid,
Rdev: u.Rdev,
Size: u.Size,
Blksize: u.Blksize,
Blocks: u.Blocks,
Atim: syscall.NsecToTimespec(unix.TimespecToNsec(u.Atim)),
Mtim: syscall.NsecToTimespec(unix.TimespecToNsec(u.Mtim)),
Ctim: syscall.NsecToTimespec(unix.TimespecToNsec(u.Ctim)),
}
}

21
app/proguard-rules.pro vendored Normal file
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# Add project specific ProGuard rules here.
# You can control the set of applied configuration files using the
# proguardFiles setting in build.gradle.
#
# For more details, see
# http://developer.android.com/guide/developing/tools/proguard.html
# If your project uses WebView with JS, uncomment the following
# and specify the fully qualified class name to the JavaScript interface
# class:
#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
# public *;
#}
# Uncomment this to preserve the line number information for
# debugging stack traces.
#-keepattributes SourceFile,LineNumberTable
# If you keep the line number information, uncomment this to
# hide the original source file name.
#-renamesourcefileattribute SourceFile

66
app/src/main/AndroidManifest.xml Normal file
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="sushi.hardcore.droidfs">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.USE_FINGERPRINT" />
<uses-permission android:name="android.permission.USE_BIOMETRIC" />
<application
android:name=".ColoredApplication"
android:allowBackup="true"
android:icon="@drawable/logo"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".SettingsActivity"
android:theme="@style/Theme.Cyanea.Dark.NoActionBar"
android:label="@string/title_activity_settings"
android:parentActivityName=".MainActivity"/>
<activity android:name=".explorers.ExplorerActivity" />
<activity android:name=".explorers.ExplorerActivityPick" />
<activity android:name=".explorers.ExplorerActivityDrop" />
<activity
android:name=".OpenActivity"
android:theme="@style/Theme.Cyanea.Dark.NoActionBar"
android:screenOrientation="nosensor"
android:windowSoftInputMode="adjustPan">
<intent-filter android:label="@string/share_menu_label">
<action android:name="android.intent.action.SEND" />
<action android:name="android.intent.action.SEND_MULTIPLE" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="*/*" />
</intent-filter>
</activity>
<activity
android:name=".CreateActivity"
android:theme="@style/Theme.Cyanea.Dark.NoActionBar"
android:screenOrientation="nosensor" />
<activity
android:name=".ChangePasswordActivity"
android:theme="@style/Theme.Cyanea.Dark.NoActionBar"
android:screenOrientation="nosensor"
android:windowSoftInputMode="adjustPan" />
<activity
android:name=".MainActivity"
android:screenOrientation="nosensor">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".file_viewers.ImageViewer" android:configChanges="screenSize|orientation" /> <!-- don't reload content on configuration change -->
<activity android:name=".file_viewers.VideoPlayer" android:configChanges="screenSize|orientation" />
<activity android:name=".file_viewers.AudioPlayer" android:configChanges="screenSize|orientation" />
<activity android:name=".file_viewers.TextEditor" android:configChanges="screenSize|orientation" />
<provider
android:name=".provider.TemporaryFileProvider"
android:authorities="${applicationId}.tempstorage"
android:exported="true"
android:writePermission="${applicationId}.READ_TEMPORARY_STORAGE" />
</application>
</manifest>

202
app/src/main/java/sushi/hardcore/droidfs/ChangePasswordActivity.kt Normal file
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package sushi.hardcore.droidfs
import android.app.Activity
import android.content.Intent
import android.os.Build
import android.os.Bundle
import android.text.Editable
import android.text.TextWatcher
import android.view.View
import android.view.WindowManager
import android.widget.AdapterView.OnItemClickListener
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_change_password.*
import kotlinx.android.synthetic.main.activity_change_password.checkbox_remember_path
import kotlinx.android.synthetic.main.activity_change_password.checkbox_save_password
import kotlinx.android.synthetic.main.activity_change_password.edit_volume_path
import kotlinx.android.synthetic.main.activity_change_password.saved_path_listview
import kotlinx.android.synthetic.main.toolbar.*
import sushi.hardcore.droidfs.adapters.SavedVolumesAdapter
import sushi.hardcore.droidfs.fingerprint_stuff.FingerprintPasswordHashSaver
import sushi.hardcore.droidfs.util.FilesUtils
import sushi.hardcore.droidfs.util.GocryptfsVolume
import sushi.hardcore.droidfs.util.WidgetUtil
import sushi.hardcore.droidfs.util.Wiper
import sushi.hardcore.droidfs.widgets.ColoredAlertDialog
import java.util.*
class ChangePasswordActivity : ColoredActivity() {
companion object {
private const val PICK_DIRECTORY_REQUEST_CODE = 1
}
private lateinit var fingerprintPasswordHashSaver: FingerprintPasswordHashSaver
private lateinit var root_cipher_dir: String
private var usf_fingerprint = false
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
if (!sharedPrefs.getBoolean("usf_screenshot", false)){
window.setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE)
}
setContentView(R.layout.activity_change_password)
setSupportActionBar(toolbar)
usf_fingerprint = sharedPrefs.getBoolean("usf_fingerprint", false)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && usf_fingerprint) {
fingerprintPasswordHashSaver = FingerprintPasswordHashSaver(this, sharedPrefs)
} else {
WidgetUtil.hide(checkbox_save_password)
}
val savedVolumesAdapter = SavedVolumesAdapter(this, sharedPrefs)
if (savedVolumesAdapter.count > 0){
saved_path_listview.adapter = savedVolumesAdapter
saved_path_listview.onItemClickListener = OnItemClickListener { _, _, position, _ ->
edit_volume_path.setText(savedVolumesAdapter.getItem(position))
}
} else {
WidgetUtil.hide(saved_path_listview)
}
edit_volume_path.addTextChangedListener(object: TextWatcher{
override fun afterTextChanged(s: Editable?) {
}
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
if (sharedPrefs.getString(s.toString(), null) == null) {
edit_old_password.hint = null
} else {
edit_old_password.hint = getString(R.string.hash_saved_hint)
}
}
})
edit_new_password_confirm.setOnEditorActionListener { v, _, _ ->
onClickChangePassword(v)
true
}
}
fun pick_directory(view: View?) {
val i = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
startActivityForResult(i, PICK_DIRECTORY_REQUEST_CODE)
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (resultCode == Activity.RESULT_OK) {
if (requestCode == PICK_DIRECTORY_REQUEST_CODE) {
if (data != null) {
val path = FilesUtils.getFullPathFromTreeUri(data.data, this)
edit_volume_path.setText(path)
}
}
}
}
fun onClickChangePassword(view: View?) {
root_cipher_dir = edit_volume_path.text.toString()
if (root_cipher_dir.isEmpty()) {
Toast.makeText(this, R.string.enter_volume_path, Toast.LENGTH_SHORT).show()
} else {
changePassword(null)
}
}
fun changePassword(givenHash: ByteArray?){
val new_password = edit_new_password.text.toString().toCharArray()
val new_password_confirm = edit_new_password_confirm.text.toString().toCharArray()
if (!new_password.contentEquals(new_password_confirm)) {
Toast.makeText(applicationContext, R.string.passwords_mismatch, Toast.LENGTH_SHORT).show()
} else {
val old_password = edit_old_password.text.toString().toCharArray()
var returnedHash: ByteArray? = null
if (usf_fingerprint && checkbox_save_password.isChecked){
returnedHash = ByteArray(GocryptfsVolume.KeyLen)
}
var changePasswordImmediately = true
if (givenHash == null){
val cipherText = sharedPrefs.getString(root_cipher_dir, null)
if (cipherText != null){ //password hash saved
fingerprintPasswordHashSaver.decrypt(cipherText, root_cipher_dir, ::changePassword)
changePasswordImmediately = false
}
}
if (changePasswordImmediately){
if (GocryptfsVolume.change_password(root_cipher_dir, old_password, givenHash, new_password, returnedHash)) {
val editor = sharedPrefs.edit()
if (sharedPrefs.getString(root_cipher_dir, null) != null){
editor.remove(root_cipher_dir)
editor.apply()
}
var continueImmediately = true
if (checkbox_remember_path.isChecked) {
val old_saved_volumes_paths = sharedPrefs.getStringSet(ConstValues.saved_volumes_key, HashSet()) as Set<String>
val new_saved_volumes_paths = old_saved_volumes_paths.toMutableList()
if (!old_saved_volumes_paths.contains(root_cipher_dir)) {
new_saved_volumes_paths.add(root_cipher_dir)
editor.putStringSet(ConstValues.saved_volumes_key, new_saved_volumes_paths.toSet())
editor.apply()
}
if (checkbox_save_password.isChecked && returnedHash != null){
fingerprintPasswordHashSaver.encryptAndSave(returnedHash, root_cipher_dir){ _ ->
onPasswordChanged()
}
continueImmediately = false
}
}
if (continueImmediately){
onPasswordChanged()
}
} else {
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(R.string.change_password_failed)
.setPositiveButton(R.string.ok, null)
.show()
}
}
Arrays.fill(old_password, 0.toChar())
}
Arrays.fill(new_password, 0.toChar())
Arrays.fill(new_password_confirm, 0.toChar())
}
fun onPasswordChanged(){
ColoredAlertDialog(this)
.setTitle(R.string.success_change_password)
.setMessage(R.string.success_change_password_msg)
.setCancelable(false)
.setPositiveButton(R.string.ok) { _, _ -> finish() }
.show()
}
fun onClickSavePasswordHash(view: View) {
if (checkbox_save_password.isChecked){
if (!fingerprintPasswordHashSaver.canAuthenticate()){
checkbox_save_password.isChecked = false
} else {
checkbox_remember_path.isChecked = true
}
}
}
fun onClickRememberPath(view: View) {
if (!checkbox_remember_path.isChecked){
checkbox_save_password.isChecked = false
}
}
override fun onPause() {
super.onPause()
if (::fingerprintPasswordHashSaver.isInitialized && fingerprintPasswordHashSaver.isListening){
fingerprintPasswordHashSaver.stopListening()
if (fingerprintPasswordHashSaver.fingerprintFragment.isAdded){
fingerprintPasswordHashSaver.fingerprintFragment.dismiss()
}
}
}
override fun onDestroy() {
super.onDestroy()
Wiper.wipeEditText(edit_old_password)
Wiper.wipeEditText(edit_new_password)
Wiper.wipeEditText(edit_new_password_confirm)
}
}

9
app/src/main/java/sushi/hardcore/droidfs/ColorEngine.kt Normal file
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package sushi.hardcore.droidfs
import android.widget.ImageView
class ColorEngine(val themeColor: Int) {
fun applyTo(imageView: ImageView){
imageView.setColorFilter(themeColor)
}
}

32
app/src/main/java/sushi/hardcore/droidfs/ColoredActivity.kt Normal file
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package sushi.hardcore.droidfs
import android.content.SharedPreferences
import android.os.Bundle
import android.view.WindowManager
import androidx.core.content.ContextCompat
import androidx.preference.PreferenceManager
import com.jaredrummler.cyanea.app.CyaneaAppCompatActivity
import sushi.hardcore.droidfs.widgets.ThemeColor
open class ColoredActivity: CyaneaAppCompatActivity() {
protected lateinit var sharedPrefs: SharedPreferences
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this)
if (!sharedPrefs.getBoolean("usf_screenshot", false)){
window.setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE)
}
val themeColor = ThemeColor.getThemeColor(this)
val backgroundColor = ContextCompat.getColor(this, R.color.backgroundColor)
if (cyanea.accent != themeColor){
cyanea.edit{
accent(themeColor)
//accentDark(themeColor)
//accentLight(themeColor)
background(backgroundColor)
//backgroundDark(backgroundColor)
//backgroundLight(backgroundColor)
}
}
}
}

11
app/src/main/java/sushi/hardcore/droidfs/ColoredApplication.kt Normal file
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package sushi.hardcore.droidfs
import android.app.Application
import com.jaredrummler.cyanea.Cyanea
class ColoredApplication: Application() {
override fun onCreate() {
super.onCreate()
Cyanea.init(this, resources)
}
}

41
app/src/main/java/sushi/hardcore/droidfs/ConstValues.kt Normal file
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package sushi.hardcore.droidfs
import java.io.File
class ConstValues {
companion object {
const val creator = "DroidFS"
const val saved_volumes_key = "saved_volumes"
const val sort_order_key = "sort_order"
const val wipe_passes = 2
const val seek_bar_inc = 200
private val fileExtensions = mapOf(
Pair("image", listOf("png", "jpg", "jpeg")),
Pair("video", listOf("mp4", "webm")),
Pair("audio", listOf("mp3", "ogg")),
Pair("text", listOf("txt", "json", "conf", "xml", "java", "kt", "py", "go", "c", "h", "cpp", "hpp", "sh", "js", "html", "css", "php"))
)
fun isImage(path: String): Boolean {
return fileExtensions["image"]?.contains(File(path).extension) ?: false
}
fun isVideo(path: String): Boolean {
return fileExtensions["video"]?.contains(File(path).extension) ?: false
}
fun isAudio(path: String): Boolean {
return fileExtensions["audio"]?.contains(File(path).extension) ?: false
}
fun isText(path: String): Boolean {
return fileExtensions["text"]?.contains(File(path).extension) ?: false
}
fun getAssociatedDrawable(path: String): Int {
return when {
isAudio(path) -> R.drawable.icon_file_audio
isImage(path) -> R.drawable.icon_file_image
isVideo(path) -> R.drawable.icon_file_video
isText(path) -> R.drawable.icon_file_text
else -> R.drawable.icon_file_unknown
}
}
}
}

191
app/src/main/java/sushi/hardcore/droidfs/CreateActivity.kt Normal file
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package sushi.hardcore.droidfs
import android.app.Activity
import android.content.Intent
import android.os.Build
import android.os.Bundle
import android.view.View
import android.view.WindowManager
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_create.*
import kotlinx.android.synthetic.main.activity_create.checkbox_remember_path
import kotlinx.android.synthetic.main.activity_create.checkbox_save_password
import kotlinx.android.synthetic.main.activity_create.edit_password
import kotlinx.android.synthetic.main.activity_create.edit_volume_path
import kotlinx.android.synthetic.main.toolbar.*
import sushi.hardcore.droidfs.explorers.ExplorerActivity
import sushi.hardcore.droidfs.fingerprint_stuff.FingerprintPasswordHashSaver
import sushi.hardcore.droidfs.util.FilesUtils
import sushi.hardcore.droidfs.util.GocryptfsVolume
import sushi.hardcore.droidfs.util.WidgetUtil
import sushi.hardcore.droidfs.util.Wiper
import sushi.hardcore.droidfs.widgets.ColoredAlertDialog
import java.io.File
import java.util.*
class CreateActivity : ColoredActivity() {
companion object {
private const val PICK_DIRECTORY_REQUEST_CODE = 1
}
private lateinit var fingerprintPasswordHashSaver: FingerprintPasswordHashSaver
private lateinit var root_cipher_dir: String
private var sessionID = -1
private var usf_fingerprint = false
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
if (!sharedPrefs.getBoolean("usf_screenshot", false)){
window.setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE)
}
setContentView(R.layout.activity_create)
setSupportActionBar(toolbar)
usf_fingerprint = sharedPrefs.getBoolean("usf_fingerprint", false)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && usf_fingerprint) {
fingerprintPasswordHashSaver = FingerprintPasswordHashSaver(this, sharedPrefs)
} else {
WidgetUtil.hide(checkbox_save_password)
}
edit_password_confirm.setOnEditorActionListener { v, _, _ ->
onClickCreate(v)
true
}
}
fun pick_directory(view: View?) {
val i = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
startActivityForResult(i, PICK_DIRECTORY_REQUEST_CODE)
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (resultCode == Activity.RESULT_OK) {
if (requestCode == PICK_DIRECTORY_REQUEST_CODE) {
if (data != null) {
val path = FilesUtils.getFullPathFromTreeUri(data.data, this)
edit_volume_path.setText(path)
}
}
}
}
fun onClickCreate(view: View?) {
val password = edit_password.text.toString().toCharArray()
val password_confirm = edit_password_confirm.text.toString().toCharArray()
if (!password.contentEquals(password_confirm)) {
Toast.makeText(applicationContext, R.string.passwords_mismatch, Toast.LENGTH_SHORT).show()
} else {
root_cipher_dir = edit_volume_path.text.toString()
val volume_path_file = File(root_cipher_dir)
var good_directory = false
if (!volume_path_file.isDirectory) {
if (volume_path_file.mkdirs()) {
good_directory = true
} else {
Toast.makeText(applicationContext, R.string.error_mkdir, Toast.LENGTH_SHORT).show()
}
} else {
val dir_content = volume_path_file.list()
if (dir_content != null){
if (dir_content.isEmpty()) {
good_directory = true
} else {
Toast.makeText(applicationContext, R.string.dir_not_empty, Toast.LENGTH_SHORT).show()
}
} else {
Toast.makeText(applicationContext, getString(R.string.listdir_null_error_msg), Toast.LENGTH_SHORT).show()
}
}
if (good_directory) {
if (GocryptfsVolume.create_volume(root_cipher_dir, password, GocryptfsVolume.ScryptDefaultLogN, ConstValues.creator)) {
var returnedHash: ByteArray? = null
if (usf_fingerprint && checkbox_save_password.isChecked){
returnedHash = ByteArray(GocryptfsVolume.KeyLen)
}
sessionID = GocryptfsVolume.init(root_cipher_dir, password, null, returnedHash)
if (sessionID != -1) {
var startExplorerImmediately = true
if (checkbox_remember_path.isChecked) {
val old_saved_volumes_paths = sharedPrefs.getStringSet(ConstValues.saved_volumes_key, HashSet()) as Set<String>
val editor = sharedPrefs.edit()
val new_saved_volumes_paths = old_saved_volumes_paths.toMutableList()
if (old_saved_volumes_paths.contains(root_cipher_dir)) {
if (sharedPrefs.getString(root_cipher_dir, null) != null){
editor.remove(root_cipher_dir)
}
} else {
new_saved_volumes_paths.add(root_cipher_dir)
editor.putStringSet(ConstValues.saved_volumes_key, new_saved_volumes_paths.toSet())
}
editor.apply()
if (checkbox_save_password.isChecked && returnedHash != null){
fingerprintPasswordHashSaver.encryptAndSave(returnedHash, root_cipher_dir){ _ ->
startExplorer()
}
startExplorerImmediately = false
}
}
if (startExplorerImmediately){
startExplorer()
}
} else {
Toast.makeText(this, R.string.open_volume_failed, Toast.LENGTH_SHORT).show()
}
} else {
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(R.string.create_volume_failed)
.setPositiveButton(R.string.ok, null)
.show()
}
}
}
Arrays.fill(password, 0.toChar())
Arrays.fill(password_confirm, 0.toChar())
}
fun startExplorer(){
ColoredAlertDialog(this)
.setTitle(R.string.success_volume_create)
.setMessage(R.string.success_volume_create_msg)
.setCancelable(false)
.setPositiveButton(R.string.ok) { _, _ ->
val intent = Intent(applicationContext, ExplorerActivity::class.java)
intent.putExtra("sessionID", sessionID)
intent.putExtra("volume_name", File(root_cipher_dir).name)
startActivity(intent)
finish()
}
.show()
}
fun onClickSavePasswordHash(view: View) {
if (checkbox_save_password.isChecked){
if (!fingerprintPasswordHashSaver.canAuthenticate()){
checkbox_save_password.isChecked = false
} else {
checkbox_remember_path.isChecked = true
}
}
}
fun onClickRememberPath(view: View) {
if (!checkbox_remember_path.isChecked){
checkbox_save_password.isChecked = false
}
}
override fun onPause() {
super.onPause()
if (::fingerprintPasswordHashSaver.isInitialized && fingerprintPasswordHashSaver.isListening){
fingerprintPasswordHashSaver.stopListening()
if (fingerprintPasswordHashSaver.fingerprintFragment.isAdded){
fingerprintPasswordHashSaver.fingerprintFragment.dismiss()
}
}
}
override fun onDestroy() {
super.onDestroy()
Wiper.wipeEditText(edit_password)
Wiper.wipeEditText(edit_password_confirm)
}
}

110
app/src/main/java/sushi/hardcore/droidfs/MainActivity.kt Normal file
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package sushi.hardcore.droidfs
import android.Manifest
import android.content.Intent
import android.content.pm.PackageManager
import android.os.Build
import android.os.Bundle
import android.os.Environment
import android.util.DisplayMetrics
import android.util.Log
import android.view.*
import androidx.appcompat.app.AppCompatActivity
import androidx.core.content.ContextCompat
import androidx.preference.PreferenceManager
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.toolbar.*
import sushi.hardcore.droidfs.widgets.ColoredAlertDialog
class MainActivity : AppCompatActivity() {
companion object {
private const val STORAGE_PERMISSIONS_REQUEST = 1
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this)
if (!sharedPrefs.getBoolean("usf_screenshot", false)){
window.setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE)
}
setContentView(R.layout.activity_main)
setSupportActionBar(toolbar)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) +
ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
requestPermissions(arrayOf(Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE), STORAGE_PERMISSIONS_REQUEST)
}
}
val state = Environment.getExternalStorageState()
val storageAvailable = Environment.MEDIA_MOUNTED == state || Environment.MEDIA_MOUNTED_READ_ONLY == state
if (!storageAvailable) {
ColoredAlertDialog(this)
.setTitle(R.string.storage_unavailable)
.setMessage(getString(R.string.storage_unavailable_msg))
.setPositiveButton(R.string.ok
) { _, _ -> finish() }.show()
}
if (!sharedPrefs.getBoolean("alreadyLaunched", false)){
ColoredAlertDialog(this)
.setTitle(R.string.warning)
.setMessage(getString(R.string.usf_home_warning_msg))
.setCancelable(false)
.setPositiveButton(getString(R.string.see_unsafe_features)){ _, _ ->
val intent = Intent(this, SettingsActivity::class.java)
intent.putExtra("screen", "UnsafeFeaturesSettingsFragment")
startActivity(intent)
}
.setNegativeButton(R.string.ok, null)
.setOnDismissListener { sharedPrefs.edit().putBoolean("alreadyLaunched", true).apply() }
.show()
}
val metrics = DisplayMetrics()
windowManager.defaultDisplay.getMetrics(metrics)
image_logo.layoutParams.height = (metrics.heightPixels/2.2).toInt()
}
override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
when (requestCode) {
STORAGE_PERMISSIONS_REQUEST -> if (grantResults.size == 2) {
if (grantResults[0] != PackageManager.PERMISSION_GRANTED || grantResults[1] != PackageManager.PERMISSION_GRANTED) {
ColoredAlertDialog(this)
.setTitle(R.string.storage_perm_denied)
.setMessage(getString(R.string.storage_perm_denied_msg))
.setPositiveButton(R.string.ok
) { _, _ -> finish() }.show()
}
}
}
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
return when (item.itemId) {
R.id.menu_settings -> {
val intent = Intent(this, SettingsActivity::class.java)
startActivity(intent)
true
}
else -> super.onOptionsItemSelected(item)
}
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
menuInflater.inflate(R.menu.main_activity, menu)
return true
}
fun onClickCreate(v: View?) {
val intent = Intent(this, CreateActivity::class.java)
startActivity(intent)
}
fun onClickOpen(v: View?) {
val intent = Intent(this, OpenActivity::class.java)
startActivity(intent)
}
fun onClickChangePassword(v: View?) {
val intent = Intent(this, ChangePasswordActivity::class.java)
startActivity(intent)
}
}

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app/src/main/java/sushi/hardcore/droidfs/OpenActivity.kt Normal file
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package sushi.hardcore.droidfs
import android.app.Activity
import android.content.Intent
import android.os.Build
import android.os.Bundle
import android.view.View
import android.widget.AdapterView.OnItemClickListener
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_change_password.*
import kotlinx.android.synthetic.main.activity_open.*
import kotlinx.android.synthetic.main.activity_open.checkbox_remember_path
import kotlinx.android.synthetic.main.activity_open.checkbox_save_password
import kotlinx.android.synthetic.main.activity_open.edit_password
import kotlinx.android.synthetic.main.activity_open.edit_volume_path
import kotlinx.android.synthetic.main.activity_open.saved_path_listview
import kotlinx.android.synthetic.main.toolbar.*
import sushi.hardcore.droidfs.adapters.SavedVolumesAdapter
import sushi.hardcore.droidfs.explorers.ExplorerActivity
import sushi.hardcore.droidfs.explorers.ExplorerActivityDrop
import sushi.hardcore.droidfs.explorers.ExplorerActivityPick
import sushi.hardcore.droidfs.fingerprint_stuff.FingerprintPasswordHashSaver
import sushi.hardcore.droidfs.util.FilesUtils
import sushi.hardcore.droidfs.util.GocryptfsVolume
import sushi.hardcore.droidfs.util.WidgetUtil
import sushi.hardcore.droidfs.util.Wiper
import sushi.hardcore.droidfs.widgets.ColoredAlertDialog
import java.io.File
import java.util.*
class OpenActivity : ColoredActivity() {
companion object {
private const val PICK_DIRECTORY_REQUEST_CODE = 1
}
private lateinit var savedVolumesAdapter: SavedVolumesAdapter
private lateinit var fingerprintPasswordHashSaver: FingerprintPasswordHashSaver
private lateinit var root_cipher_dir: String
private var sessionID = -1
private var usf_fingerprint = false
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_open)
setSupportActionBar(toolbar)
//val sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this)
usf_fingerprint = sharedPrefs.getBoolean("usf_fingerprint", false)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && usf_fingerprint) {
fingerprintPasswordHashSaver = FingerprintPasswordHashSaver(this, sharedPrefs)
} else {
WidgetUtil.hide(checkbox_save_password)
}
savedVolumesAdapter = SavedVolumesAdapter(this, sharedPrefs)
if (savedVolumesAdapter.count > 0){
saved_path_listview.adapter = savedVolumesAdapter
saved_path_listview.onItemClickListener = OnItemClickListener { _, _, position, _ ->
root_cipher_dir = savedVolumesAdapter.getItem(position)
edit_volume_path.setText(root_cipher_dir)
val cipherText = sharedPrefs.getString(root_cipher_dir, null)
if (cipherText != null){ //password hash saved
fingerprintPasswordHashSaver.decrypt(cipherText, root_cipher_dir, ::openUsingPasswordHash)
}
}
} else {
WidgetUtil.hide(saved_path_listview)
}
edit_password.setOnEditorActionListener { v, _, _ ->
onClickOpen(v)
true
}
}
fun pick_directory(view: View?) {
val i = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
startActivityForResult(i, PICK_DIRECTORY_REQUEST_CODE)
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (resultCode == Activity.RESULT_OK) {
if (requestCode == PICK_DIRECTORY_REQUEST_CODE) {
if (data != null) {
val path = FilesUtils.getFullPathFromTreeUri(data.data, this)
edit_volume_path.setText(path)
}
}
}
}
fun onClickOpen(view: View?) {
root_cipher_dir = edit_volume_path.text.toString() //fresh get in case of manual rewrite
if (root_cipher_dir.isEmpty()) {
Toast.makeText(this, R.string.enter_volume_path, Toast.LENGTH_SHORT).show()
} else {
val password = edit_password.text.toString().toCharArray()
var returnedHash: ByteArray? = null
if (usf_fingerprint && checkbox_save_password.isChecked){
returnedHash = ByteArray(GocryptfsVolume.KeyLen)
}
sessionID = GocryptfsVolume.init(root_cipher_dir, password, null, returnedHash)
if (sessionID != -1) {
var startExplorerImmediately = true
if (checkbox_remember_path.isChecked) {
savedVolumesAdapter.addVolumePath(root_cipher_dir)
if (checkbox_save_password.isChecked && returnedHash != null){
fingerprintPasswordHashSaver.encryptAndSave(returnedHash, root_cipher_dir) {success ->
if (success){
startExplorer()
}
}
startExplorerImmediately = false
}
}
if (startExplorerImmediately){
startExplorer()
}
} else {
ColoredAlertDialog(this)
.setTitle(R.string.open_volume_failed)
.setMessage(R.string.open_volume_failed_msg)
.setPositiveButton(R.string.ok, null)
.show()
}
Arrays.fill(password, 0.toChar())
}
}
private fun openUsingPasswordHash(passwordHash: ByteArray){
sessionID = GocryptfsVolume.init(root_cipher_dir, null, passwordHash, null)
if (sessionID != -1){
startExplorer()
} else {
ColoredAlertDialog(this)
.setTitle(R.string.open_volume_failed)
.setMessage(getString(R.string.open_failed_hash_msg))
.setPositiveButton(R.string.ok, null)
.show()
}
Arrays.fill(passwordHash, 0)
}
private fun startExplorer() {
var explorer_intent: Intent? = null
val current_intent_action = intent.action
if (current_intent_action != null) {
if ((current_intent_action == Intent.ACTION_SEND || current_intent_action == Intent.ACTION_SEND_MULTIPLE) && intent.extras != null) { //import via android share menu
explorer_intent = Intent(this, ExplorerActivityDrop::class.java)
explorer_intent.action = current_intent_action //forward action
explorer_intent.putExtras(intent.extras!!) //forward extras
} else if (current_intent_action == "pick") { //pick items to import
explorer_intent = Intent(this, ExplorerActivityPick::class.java)
explorer_intent.flags = Intent.FLAG_ACTIVITY_FORWARD_RESULT
}
}
if (explorer_intent == null) {
explorer_intent = Intent(this, ExplorerActivity::class.java) //default opening
}
explorer_intent.putExtra("sessionID", sessionID)
explorer_intent.putExtra("volume_name", File(root_cipher_dir).name)
startActivity(explorer_intent)
finish()
}
fun onClickSavePasswordHash(view: View) {
if (checkbox_save_password.isChecked){
if (!fingerprintPasswordHashSaver.canAuthenticate()){
checkbox_save_password.isChecked = false
} else {
checkbox_remember_path.isChecked = true
}
}
}
fun onClickRememberPath(view: View) {
if (!checkbox_remember_path.isChecked){
checkbox_save_password.isChecked = false
}
}
override fun onPause() {
super.onPause()
if (::fingerprintPasswordHashSaver.isInitialized && fingerprintPasswordHashSaver.isListening){
fingerprintPasswordHashSaver.stopListening()
if (fingerprintPasswordHashSaver.fingerprintFragment.isAdded){
fingerprintPasswordHashSaver.fingerprintFragment.dismiss()
}
}
}
override fun onDestroy() {
super.onDestroy()
Wiper.wipeEditText(edit_password)
}
}

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app/src/main/java/sushi/hardcore/droidfs/SettingsActivity.kt Normal file
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package sushi.hardcore.droidfs
import android.os.Bundle
import android.view.WindowManager
import androidx.fragment.app.Fragment
import androidx.preference.Preference
import androidx.preference.PreferenceFragmentCompat
import kotlinx.android.synthetic.main.toolbar.*
class SettingsActivity : ColoredActivity(), PreferenceFragmentCompat.OnPreferenceStartFragmentCallback {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
if (!sharedPrefs.getBoolean("usf_screenshot", false)){
window.setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE)
}
setContentView(R.layout.activity_settings)
setSupportActionBar(toolbar)
supportActionBar?.setDisplayHomeAsUpEnabled(true)
val screen = intent.extras?.getString("screen") ?: "main"
val fragment: Fragment
fragment = if (screen == "UnsafeFeaturesSettingsFragment") {
UnsafeFeaturesSettingsFragment()
} else {
SettingsFragment()
}
supportFragmentManager
.beginTransaction()
.replace(R.id.settings, fragment)
.commit()
}
class SettingsFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.root_preferences, rootKey)
}
}
class UnsafeFeaturesSettingsFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.unsafe_features_preferences, rootKey)
}
}
override fun onPreferenceStartFragment(caller: PreferenceFragmentCompat, pref: Preference): Boolean {
val fragment = supportFragmentManager.fragmentFactory.instantiate(classLoader, pref.fragment)
fragment.arguments = pref.extras
fragment.setTargetFragment(caller, 0)
supportFragmentManager.beginTransaction().replace(R.id.settings, fragment).addToBackStack(null).commit()
return true
}
}

128
app/src/main/java/sushi/hardcore/droidfs/adapters/ExplorerElementAdapter.kt Normal file
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package sushi.hardcore.droidfs.adapters
import android.content.Context
import android.graphics.Color
import android.graphics.PorterDuff
import android.graphics.PorterDuffColorFilter
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.BaseAdapter
import android.widget.ImageView
import android.widget.TextView
import androidx.core.content.ContextCompat
import sushi.hardcore.droidfs.ConstValues.Companion.getAssociatedDrawable
import sushi.hardcore.droidfs.explorers.ExplorerElement
import sushi.hardcore.droidfs.R
import sushi.hardcore.droidfs.util.FilesUtils
import sushi.hardcore.droidfs.widgets.ThemeColor
import java.text.DateFormat
import java.util.*
class ExplorerElementAdapter(private val context: Context) : BaseAdapter() {
private val dateFormat: DateFormat = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, context.resources.configuration.locale)
private lateinit var explorer_elements: List<ExplorerElement>
private val inflater: LayoutInflater = LayoutInflater.from(context)
val selectedItems: MutableList<Int> = ArrayList()
private val themeColor = ThemeColor.getThemeColor(context)
override fun getCount(): Int {
return explorer_elements.size
}
override fun getItem(position: Int): ExplorerElement {
return explorer_elements[position]
}
override fun getItemId(position: Int): Long {
return 0
}
override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
val view: View = convertView ?: inflater.inflate(R.layout.adapter_explorer_element, parent, false)
val currentElement = getItem(position)
val textElementName = view.findViewById<TextView>(R.id.text_element_name)
textElementName.text = currentElement.name
val textElementMtime = view.findViewById<TextView>(R.id.text_element_mtime)
val textElementSize = view.findViewById<TextView>(R.id.text_element_size)
textElementSize.text = ""
var drawableId = R.drawable.icon_folder
when {
currentElement.isDirectory -> {
textElementMtime.text = dateFormat.format(currentElement.mTime)
}
currentElement.isParentFolder -> {
textElementMtime.setText(R.string.parent_folder)
}
else -> {
textElementMtime.text = dateFormat.format(currentElement.mTime)
textElementSize.text = FilesUtils.formatSize(currentElement.size)
drawableId = getAssociatedDrawable(currentElement.name)
}
}
val elementIcon = view.findViewById<ImageView>(R.id.icon_element)
val icon = context.getDrawable(drawableId)
icon?.colorFilter = PorterDuffColorFilter(themeColor, PorterDuff.Mode.SRC_IN)
elementIcon.setImageDrawable(icon)
if (selectedItems.contains(position)) {
view.setBackgroundColor(ContextCompat.getColor(context, R.color.item_selected))
} else {
view.setBackgroundColor(Color.alpha(0))
}
return view
}
fun onItemClick(position: Int) {
if (selectedItems.isNotEmpty()) {
if (!explorer_elements[position].isParentFolder) {
if (selectedItems.contains(position)) {
selectedItems.remove(position)
} else {
selectedItems.add(position)
}
notifyDataSetInvalidated()
}
}
}
fun onItemLongClick(position: Int) {
if (!explorer_elements[position].isParentFolder) {
if (!selectedItems.contains(position)) {
selectedItems.add(position)
} else {
selectedItems.remove(position)
}
notifyDataSetInvalidated()
}
}
fun selectAll() {
for (i in explorer_elements.indices) {
if (!selectedItems.contains(i) && !explorer_elements[i].isParentFolder) {
selectedItems.add(i)
}
}
notifyDataSetInvalidated()
}
fun unSelectAll() {
selectedItems.clear()
notifyDataSetInvalidated()
}
fun setExplorerElements(explorer_elements: List<ExplorerElement>) {
unSelectAll()
this.explorer_elements = explorer_elements
}
val currentDirectoryTotalSize: Long
get() {
var total_size: Long = 0
for (e in explorer_elements) {
if (e.isRegularFile) {
total_size += e.size
}
}
return total_size
}
}

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app/src/main/java/sushi/hardcore/droidfs/adapters/OpenAsDialogAdapter.kt Normal file
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package sushi.hardcore.droidfs.adapters
import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.BaseAdapter
import android.widget.TextView
import sushi.hardcore.droidfs.R
import sushi.hardcore.droidfs.widgets.ColoredImageView
class OpenAsDialogAdapter(private val context: Context): BaseAdapter() {
private val inflater: LayoutInflater = LayoutInflater.from(context)
private val items = listOf(
listOf("image", context.getString(R.string.image), R.drawable.icon_file_image),
listOf("video", context.getString(R.string.video), R.drawable.icon_file_video),
listOf("audio", context.getString(R.string.audio), R.drawable.icon_file_audio),
listOf("text", context.getString(R.string.text), R.drawable.icon_file_text)
)
override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
val view: View = convertView ?: inflater.inflate(R.layout.adapter_dialog_listview, parent, false)
val text = view.findViewById<TextView>(R.id.text)
text.text = items[position][1] as String
val icon = view.findViewById<ColoredImageView>(R.id.icon)
icon.setImageDrawable(context.getDrawable(items[position][2] as Int))
return view
}
override fun getItem(position: Int): String {
return items[position][0] as String
}
override fun getItemId(position: Int): Long { return 0 }
override fun getCount(): Int { return items.size }
}

100
app/src/main/java/sushi/hardcore/droidfs/adapters/SavedVolumesAdapter.kt Normal file
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package sushi.hardcore.droidfs.adapters
import androidx.appcompat.app.AlertDialog
import android.content.Context
import android.content.SharedPreferences
import android.content.SharedPreferences.Editor
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.BaseAdapter
import android.widget.ImageView
import android.widget.TextView
import sushi.hardcore.droidfs.ConstValues
import sushi.hardcore.droidfs.R
import sushi.hardcore.droidfs.util.WidgetUtil
import sushi.hardcore.droidfs.widgets.ColoredAlertDialog
import java.util.*
class SavedVolumesAdapter(val context: Context, val shared_prefs: SharedPreferences) : BaseAdapter() {
private val inflater: LayoutInflater = LayoutInflater.from(context)
private val saved_volumes_paths: MutableList<String> = ArrayList()
private val shared_prefs_editor: Editor = shared_prefs.edit()
init {
val saved_volumes_paths_set = shared_prefs.getStringSet(ConstValues.saved_volumes_key, HashSet()) as Set<String>
for (volume_path in saved_volumes_paths_set) {
saved_volumes_paths.add(volume_path)
}
}
private fun update_shared_prefs() {
val saved_volumes_paths_set = saved_volumes_paths.toSet()
shared_prefs_editor.remove(ConstValues.saved_volumes_key)
shared_prefs_editor.putStringSet(ConstValues.saved_volumes_key, saved_volumes_paths_set)
shared_prefs_editor.apply()
}
override fun getCount(): Int {
return saved_volumes_paths.size
}
override fun getItem(position: Int): String {
return saved_volumes_paths[position]
}
override fun getItemId(position: Int): Long {
return 0
}
override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
val view: View = convertView ?: inflater.inflate(R.layout.adapter_saved_volume, parent, false)
val volume_name_textview = view.findViewById<TextView>(R.id.volume_name_textview)
val currentVolume = getItem(position)
volume_name_textview.text = currentVolume
val delete_imageview = view.findViewById<ImageView>(R.id.delete_imageview)
delete_imageview.setOnClickListener {
val volume_path = saved_volumes_paths[position]
val dialog = ColoredAlertDialog(context)
dialog.setTitle(R.string.warning)
if (shared_prefs.getString(volume_path, null) != null){
dialog.setMessage(context.getString(R.string.delete_hash_or_all))
dialog.setPositiveButton(context.getString(R.string.delete_all)) { _, _ ->
saved_volumes_paths.removeAt(position)
shared_prefs_editor.remove(volume_path)
update_shared_prefs()
refresh(parent)
}
dialog.setNegativeButton(context.getString(R.string.delete_hash)) { _, _ ->
shared_prefs_editor.remove(volume_path)
shared_prefs_editor.apply()
}
} else {
dialog.setMessage(context.getString(R.string.ask_delete_volume_path))
dialog.setPositiveButton(R.string.ok) {_, _ ->
saved_volumes_paths.removeAt(position)
update_shared_prefs()
refresh(parent)
}
dialog.setNegativeButton(R.string.cancel, null)
}
dialog.show()
}
return view
}
private fun refresh(parent: ViewGroup) {
notifyDataSetChanged()
if (count == 0){
WidgetUtil.hide(parent)
}
}
fun addVolumePath(volume_path: String) {
if (!saved_volumes_paths.contains(volume_path)) {
saved_volumes_paths.add(volume_path)
update_shared_prefs()
}
}
}

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app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivity.kt Normal file
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package sushi.hardcore.droidfs.explorers
import android.app.Activity
import android.content.Intent
import android.net.Uri
import android.view.Menu
import android.view.MenuItem
import android.view.View
import kotlinx.android.synthetic.main.activity_explorer.*
import sushi.hardcore.droidfs.OpenActivity
import sushi.hardcore.droidfs.R
import sushi.hardcore.droidfs.util.ExternalProvider
import sushi.hardcore.droidfs.util.FilesUtils
import sushi.hardcore.droidfs.util.GocryptfsVolume
import sushi.hardcore.droidfs.util.Wiper
import sushi.hardcore.droidfs.widgets.ColoredAlertDialog
import java.io.File
import java.util.*
class ExplorerActivity : ExplorerActivityRO() {
private val PICK_DIRECTORY_REQUEST_CODE = 1
private val PICK_FILES_REQUEST_CODE = 2
private val PICK_OTHER_VOLUME_ITEMS_REQUEST_CODE = 3
private var usf_decrypt = false
private var usf_share = false
override fun init() {
setContentView(R.layout.activity_explorer)
usf_decrypt = sharedPrefs.getBoolean("usf_decrypt", false)
usf_share = sharedPrefs.getBoolean("usf_share", false)
}
fun onClickAddFile(view: View?) {
fam_explorer.close(true)
val i = Intent(Intent.ACTION_OPEN_DOCUMENT)
i.type = "*/*"
i.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true)
i.addCategory(Intent.CATEGORY_OPENABLE)
startActivityForResult(i, PICK_FILES_REQUEST_CODE)
}
fun onClickAddFileFromOtherVolume(view: View?) {
fam_explorer.close(true)
val intent = Intent(this, OpenActivity::class.java)
intent.action = "pick"
startActivityForResult(intent, PICK_OTHER_VOLUME_ITEMS_REQUEST_CODE)
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (requestCode == PICK_FILES_REQUEST_CODE) {
if (resultCode == Activity.RESULT_OK && data != null) {
val uris: MutableList<Uri> = ArrayList()
val single_uri = data.data
if (single_uri == null) { //multiples choices
val clipdata = data.clipData
if (clipdata != null){
for (i in 0 until clipdata.itemCount) {
uris.add(clipdata.getItemAt(i).uri)
}
}
} else {
uris.add(single_uri)
}
if (uris.isNotEmpty()){
var success = true
for (uri in uris) {
val dst_path = FilesUtils.path_join(current_path, FilesUtils.getFilenameFromURI(this, uri))
var `is` = contentResolver.openInputStream(uri)
if (`is` != null) {
success = gocryptfsVolume.import_file(`is`, dst_path)
}
if (!success) {
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(getString(R.string.import_failed, uri))
.setPositiveButton(R.string.ok, null)
.show()
break
}
}
if (success) {
ColoredAlertDialog(this)
.setTitle(R.string.success_import)
.setMessage("""
${getString(R.string.success_import_msg)}
${getString(R.string.ask_for_wipe)}
""".trimIndent())
.setPositiveButton(R.string.yes) { _, _ ->
success = true
for (uri in uris) {
if (!Wiper.wipe(this, uri)) {
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(getString(R.string.wipe_failed, uri))
.setPositiveButton(R.string.ok, null)
.show()
success = false
break
}
}
if (success) {
ColoredAlertDialog(this)
.setTitle(R.string.wipe_successful)
.setMessage(R.string.wipe_success_msg)
.setPositiveButton(R.string.ok, null)
.show()
}
}
.setNegativeButton(getString(R.string.no), null)
.show()
}
setCurrentPath(current_path)
}
}
} else if (requestCode == PICK_DIRECTORY_REQUEST_CODE) {
if (resultCode == Activity.RESULT_OK && data != null) {
val uri = data.data
val output_dir = FilesUtils.getFullPathFromTreeUri(uri, this)
var failed_item: String? = null
for (i in explorer_adapter.selectedItems) {
val element = explorer_adapter.getItem(i)
val full_path = FilesUtils.path_join(current_path, element.name)
failed_item = if (element.isDirectory) {
recursive_export_directory(full_path, output_dir)
} else {
if (gocryptfsVolume.export_file(full_path, FilesUtils.path_join(output_dir, element.name))) null else full_path
}
if (failed_item != null) {
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(getString(R.string.export_failed, failed_item))
.setPositiveButton(R.string.ok, null)
.show()
break
}
}
if (failed_item == null) {
ColoredAlertDialog(this)
.setTitle(R.string.success_export)
.setMessage(R.string.success_export_msg)
.setPositiveButton(R.string.ok, null)
.show()
}
}
explorer_adapter.unSelectAll()
invalidateOptionsMenu()
} else if (requestCode == PICK_OTHER_VOLUME_ITEMS_REQUEST_CODE) {
if (resultCode == Activity.RESULT_OK && data != null) {
val remote_sessionID = data.getIntExtra("sessionID", -1)
val remote_gocryptfsVolume = GocryptfsVolume(remote_sessionID)
val path = data.getStringExtra("path")
var failed_item: String? = null
if (path == null) {
val paths = data.getStringArrayListExtra("paths")
val types = data.getIntegerArrayListExtra("types")
if (types != null && paths != null){
for (i in paths.indices) {
failed_item = if (types[i] == 0) { //directory
recursive_import_directory_from_other_volume(remote_gocryptfsVolume, paths[i], current_path)
} else {
if (import_file_from_other_volume(remote_gocryptfsVolume, paths[i], current_path)) null else paths[i]
}
if (failed_item != null) {
break
}
}
}
} else {
failed_item = if (import_file_from_other_volume(remote_gocryptfsVolume, path, current_path)) null else path
}
if (failed_item == null) {
ColoredAlertDialog(this)
.setTitle(R.string.success_import)
.setMessage(R.string.success_import_msg)
.setPositiveButton(R.string.ok, null)
.show()
} else {
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(getString(R.string.import_failed, failed_item))
.setPositiveButton(R.string.ok, null)
.show()
}
remote_gocryptfsVolume.close()
setCurrentPath(current_path)
}
}
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
menuInflater.inflate(R.menu.explorer, menu)
handle_menu_items(menu)
if (usf_share){
menu.findItem(R.id.explorer_menu_share).isVisible = false
}
val any_item_selected = explorer_adapter.selectedItems.isNotEmpty()
menu.findItem(R.id.explorer_menu_select_all).isVisible = any_item_selected
menu.findItem(R.id.explorer_menu_delete).isVisible = any_item_selected
menu.findItem(R.id.explorer_menu_decrypt).isVisible = any_item_selected && usf_decrypt
if (any_item_selected && usf_share){
var containsDir = false
for (i in explorer_adapter.selectedItems) {
if (explorer_elements[i].isDirectory) {
containsDir = true
break
}
}
if (!containsDir) {
menu.findItem(R.id.explorer_menu_share).isVisible = true
}
}
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
return when (item.itemId) {
R.id.explorer_menu_select_all -> {
explorer_adapter.selectAll()
invalidateOptionsMenu()
true
}
R.id.explorer_menu_delete -> {
val size = explorer_adapter.selectedItems.size
val dialog = ColoredAlertDialog(this)
dialog.setTitle(R.string.warning)
dialog.setPositiveButton(R.string.ok) { _, _ -> remove_selected_items() }
dialog.setNegativeButton(R.string.cancel, null)
if (size > 1) {
dialog.setMessage(getString(R.string.multiple_delete_confirm, explorer_adapter.selectedItems.size.toString()))
} else {
dialog.setMessage(getString(R.string.single_delete_confirm, explorer_adapter.getItem(explorer_adapter.selectedItems[0]).name))
}
dialog.show()
true
}
R.id.explorer_menu_share -> {
val paths: MutableList<String> = ArrayList()
for (i in explorer_adapter.selectedItems) {
val e = explorer_elements[i]
paths.add(FilesUtils.path_join(current_path, e.name))
}
ExternalProvider.share(this, gocryptfsVolume, paths)
explorer_adapter.unSelectAll()
invalidateOptionsMenu()
true
}
R.id.explorer_menu_decrypt -> {
val i = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
startActivityForResult(i, PICK_DIRECTORY_REQUEST_CODE)
true
}
else -> super.onOptionsItemSelected(item)
}
}
private fun import_file_from_other_volume(remote_gocryptfsVolume: GocryptfsVolume, full_path: String, output_dir: String): Boolean {
val output_path = FilesUtils.path_join(output_dir, File(full_path).name)
var success = true
val src_handleID = remote_gocryptfsVolume.open_read_mode(full_path)
if (src_handleID != -1) {
val dst_handleID = gocryptfsVolume.open_write_mode(output_path)
if (dst_handleID != -1) {
var length: Int
val io_buffer = ByteArray(GocryptfsVolume.DefaultBS)
var offset: Long = 0
while (remote_gocryptfsVolume.read_file(src_handleID, offset, io_buffer).also { length = it } > 0){
val written = gocryptfsVolume.write_file(dst_handleID, offset, io_buffer, length).toLong()
if (written == length.toLong()) {
offset += length.toLong()
} else {
success = false
break
}
}
gocryptfsVolume.close_file(dst_handleID)
}
remote_gocryptfsVolume.close_file(src_handleID)
}
return success
}
private fun recursive_import_directory_from_other_volume(remote_gocryptfsVolume: GocryptfsVolume, remote_directory_path: String, output_dir: String): String? {
val directory_path = FilesUtils.path_join(output_dir, File(remote_directory_path).name)
if (!gocryptfsVolume.path_exists(directory_path)) {
if (!gocryptfsVolume.mkdir(directory_path)) {
return directory_path
}
}
val explorer_elements = remote_gocryptfsVolume.list_dir(remote_directory_path)
for (e in explorer_elements) {
val full_path = FilesUtils.path_join(remote_directory_path, e.name)
if (e.isDirectory) {
val failed_item = recursive_import_directory_from_other_volume(remote_gocryptfsVolume, full_path, directory_path)
failed_item?.let { return it }
} else {
if (!import_file_from_other_volume(remote_gocryptfsVolume, full_path, directory_path)) {
return full_path
}
}
}
return null
}
private fun recursive_export_directory(plain_directory_path: String, output_dir: String?): String? {
if (File(FilesUtils.path_join(output_dir, plain_directory_path)).mkdir()) {
val explorer_elements = gocryptfsVolume.list_dir(plain_directory_path)
for (e in explorer_elements) {
val full_path = FilesUtils.path_join(plain_directory_path, e.name)
if (e.isDirectory) {
val failed_item = recursive_export_directory(full_path, output_dir)
failed_item?.let { return it }
} else {
if (!gocryptfsVolume.export_file(full_path, FilesUtils.path_join(output_dir, full_path))) {
return full_path
}
}
}
return null
}
return output_dir
}
private fun recursive_remove_directory(plain_directory_path: String): String? {
val explorer_elements = gocryptfsVolume.list_dir(plain_directory_path)
for (e in explorer_elements) {
val full_path = FilesUtils.path_join(plain_directory_path, e.name)
if (e.isDirectory) {
val result = recursive_remove_directory(full_path)
result?.let { return it }
} else {
if (!gocryptfsVolume.remove_file(full_path)) {
return full_path
}
}
}
return if (!gocryptfsVolume.rmdir(plain_directory_path)) {
plain_directory_path
} else {
null
}
}
private fun remove_selected_items() {
var failed_item: String? = null
for (i in explorer_adapter.selectedItems) {
val element = explorer_adapter.getItem(i)
val full_path = FilesUtils.path_join(current_path, element.name)
if (element.isDirectory) {
val result = recursive_remove_directory(full_path)
result?.let{ failed_item = it }
} else {
if (!gocryptfsVolume.remove_file(full_path)) {
failed_item = full_path
}
}
if (failed_item != null) {
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(getString(R.string.remove_failed, failed_item))
.setPositiveButton(R.string.ok, null)
.show()
break
}
}
explorer_adapter.unSelectAll()
invalidateOptionsMenu()
setCurrentPath(current_path) //refresh
}
}

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app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivityDrop.kt Normal file
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package sushi.hardcore.droidfs.explorers
import android.content.Intent
import android.net.Uri
import android.view.Menu
import android.view.MenuItem
import sushi.hardcore.droidfs.R
import sushi.hardcore.droidfs.util.FilesUtils
import sushi.hardcore.droidfs.widgets.ColoredAlertDialog
class ExplorerActivityDrop : ExplorerActivityRO() {
override fun init() {
setContentView(R.layout.activity_explorer_drop)
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
menuInflater.inflate(R.menu.explorer_drop, menu)
handle_menu_items(menu)
menu.findItem(R.id.explorer_menu_validate).isVisible = explorer_adapter.selectedItems.isEmpty()
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
return when (item.itemId) {
R.id.explorer_menu_validate -> {
val alertDialog = ColoredAlertDialog(this)
alertDialog.setCancelable(false)
alertDialog.setPositiveButton(R.string.ok) { _, _ -> finish() }
var error_msg: String? = null
val extras = intent.extras
if (extras != null && extras.containsKey(Intent.EXTRA_STREAM)){
if (intent.action == Intent.ACTION_SEND) {
val uri = intent.getParcelableExtra<Uri>(Intent.EXTRA_STREAM)
val output_path = FilesUtils.path_join(current_path, FilesUtils.getFilenameFromURI(this, uri))
error_msg = if (gocryptfsVolume.import_file(this, uri, output_path)) null else getString(R.string.import_failed, output_path)
} else if (intent.action == Intent.ACTION_SEND_MULTIPLE) {
val uris = intent.getParcelableArrayListExtra<Uri>(Intent.EXTRA_STREAM)
if (uris != null){
for (uri in uris) {
val output_path = FilesUtils.path_join(current_path, FilesUtils.getFilenameFromURI(this, uri))
if (!gocryptfsVolume.import_file(this, uri, output_path)) {
error_msg = getString(R.string.import_failed, output_path)
break
}
}
} else {
error_msg = getString(R.string.share_intent_parsing_failed)
}
} else {
error_msg = getString(R.string.share_intent_parsing_failed)
}
} else {
error_msg = getString(R.string.share_intent_parsing_failed)
}
if (error_msg == null) {
alertDialog.setTitle(R.string.success_import)
alertDialog.setMessage(R.string.success_import_msg)
} else {
alertDialog.setTitle(R.string.error)
alertDialog.setMessage(error_msg)
}
alertDialog.show()
true
}
else -> super.onOptionsItemSelected(item)
}
}
}

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app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivityPick.kt Normal file
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package sushi.hardcore.droidfs.explorers
import android.app.Activity
import android.content.Intent
import android.view.Menu
import android.view.MenuItem
import sushi.hardcore.droidfs.R
import sushi.hardcore.droidfs.provider.TemporaryFileProvider
import sushi.hardcore.droidfs.util.FilesUtils
import java.util.*
class ExplorerActivityPick : ExplorerActivityRO() {
private var result_intent = Intent()
override fun init() {
super.init()
result_intent.putExtra("sessionID", gocryptfsVolume.sessionID)
}
override fun onExplorerItemClick(position: Int) {
val wasSelecting = explorer_adapter.selectedItems.isNotEmpty()
explorer_adapter.onItemClick(position)
if (explorer_adapter.selectedItems.isEmpty()) {
if (!wasSelecting) {
val full_path = FilesUtils.path_join(current_path, explorer_elements[position].name)
when {
explorer_elements[position].isDirectory -> {
setCurrentPath(full_path)
}
explorer_elements[position].isParentFolder -> {
setCurrentPath(FilesUtils.get_parent_path(current_path))
}
else -> {
result_intent.putExtra("path", full_path)
return_activity_result()
}
}
}
}
invalidateOptionsMenu()
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
menuInflater.inflate(R.menu.explorer_pick, menu)
handle_menu_items(menu)
val any_item_selected = explorer_adapter.selectedItems.isNotEmpty()
menu.findItem(R.id.explorer_menu_select_all).isVisible = any_item_selected
menu.findItem(R.id.explorer_menu_validate).isVisible = any_item_selected
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
return when (item.itemId) {
R.id.explorer_menu_select_all -> {
explorer_adapter.selectAll()
invalidateOptionsMenu()
true
}
R.id.explorer_menu_validate -> {
val paths = ArrayList<String>()
val types = ArrayList<Int>()
for (i in explorer_adapter.selectedItems) {
val e = explorer_elements[i]
paths.add(FilesUtils.path_join(current_path, e.name))
types.add(e.elementType.toInt())
}
result_intent.putStringArrayListExtra("paths", paths)
result_intent.putIntegerArrayListExtra("types", types)
return_activity_result()
true
}
else -> super.onOptionsItemSelected(item)
}
}
private fun return_activity_result() {
setResult(Activity.RESULT_OK, result_intent)
finish()
}
override fun closeVolumeOnDestroy() {
//don't close volume
TemporaryFileProvider.wipeAll()
}
override fun closeVolumeOnUserExit() {
super.closeVolumeOnUserExit()
super.closeVolumeOnDestroy()
}
}

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app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivityRO.kt Normal file
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package sushi.hardcore.droidfs.explorers
import android.content.Intent
import android.content.SharedPreferences
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import android.view.View
import android.view.WindowManager
import android.widget.AdapterView.OnItemClickListener
import android.widget.AdapterView.OnItemLongClickListener
import android.widget.EditText
import android.widget.ListView
import android.widget.Toast
import com.github.clans.fab.FloatingActionMenu
import kotlinx.android.synthetic.main.activity_explorer_ro.*
import kotlinx.android.synthetic.main.explorer_info_bar.*
import kotlinx.android.synthetic.main.toolbar.*
import sushi.hardcore.droidfs.ColoredActivity
import sushi.hardcore.droidfs.ConstValues
import sushi.hardcore.droidfs.ConstValues.Companion.isAudio
import sushi.hardcore.droidfs.ConstValues.Companion.isImage
import sushi.hardcore.droidfs.ConstValues.Companion.isText
import sushi.hardcore.droidfs.ConstValues.Companion.isVideo
import sushi.hardcore.droidfs.R
import sushi.hardcore.droidfs.adapters.OpenAsDialogAdapter
import sushi.hardcore.droidfs.adapters.ExplorerElementAdapter
import sushi.hardcore.droidfs.file_viewers.AudioPlayer
import sushi.hardcore.droidfs.file_viewers.ImageViewer
import sushi.hardcore.droidfs.file_viewers.TextEditor
import sushi.hardcore.droidfs.file_viewers.VideoPlayer
import sushi.hardcore.droidfs.provider.TemporaryFileProvider
import sushi.hardcore.droidfs.util.ExternalProvider
import sushi.hardcore.droidfs.util.FilesUtils
import sushi.hardcore.droidfs.util.GocryptfsVolume
import sushi.hardcore.droidfs.widgets.ColoredAlertDialog
import java.util.*
open class ExplorerActivityRO : ColoredActivity() {
private lateinit var shared_prefs_editor: SharedPreferences.Editor
private lateinit var sort_modes_entries: Array<String>
private lateinit var sort_modes_values: Array<String>
private var current_sort_mode_index = 0
protected lateinit var gocryptfsVolume: GocryptfsVolume
private lateinit var volume_name: String
protected var current_path = ""
protected lateinit var explorer_elements: MutableList<ExplorerElement>
protected lateinit var explorer_adapter: ExplorerElementAdapter
private var usf_open = false
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
if (!sharedPrefs.getBoolean("usf_screenshot", false)){
window.setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE)
}
usf_open = sharedPrefs.getBoolean("usf_open", false)
val intent = intent
volume_name = intent.getStringExtra("volume_name")
val sessionID = intent.getIntExtra("sessionID", -1)
gocryptfsVolume = GocryptfsVolume(sessionID)
sort_modes_entries = resources.getStringArray(R.array.sort_orders_entries)
sort_modes_values = resources.getStringArray(R.array.sort_orders_values)
current_sort_mode_index = resources.getStringArray(R.array.sort_orders_values).indexOf(sharedPrefs.getString(ConstValues.sort_order_key, "name"))
shared_prefs_editor = sharedPrefs.edit()
init()
setSupportActionBar(toolbar)
title = ""
title_text.text = getString(R.string.volume, volume_name)
explorer_adapter = ExplorerElementAdapter(this)
setCurrentPath(current_path)
list_explorer.adapter = explorer_adapter
list_explorer.onItemClickListener = OnItemClickListener { _, _, position, _ -> onExplorerItemClick(position) }
list_explorer.onItemLongClickListener = OnItemLongClickListener { _, _, position, _ ->
explorer_adapter.onItemLongClick(position)
invalidateOptionsMenu()
true
}
refresher.setOnRefreshListener {
setCurrentPath(current_path)
refresher.isRefreshing = false
}
}
protected open fun init() {
setContentView(R.layout.activity_explorer_ro)
}
private fun startFileViewer(cls: Class<*>, filePath: String){
val intent = Intent(this, cls)
intent.putExtra("path", filePath)
intent.putExtra("sessionID", gocryptfsVolume.sessionID)
startActivity(intent)
}
protected open fun onExplorerItemClick(position: Int) {
val wasSelecting = explorer_adapter.selectedItems.isNotEmpty()
explorer_adapter.onItemClick(position)
if (explorer_adapter.selectedItems.isEmpty()) {
if (!wasSelecting) {
val full_path = FilesUtils.path_join(current_path, explorer_elements[position].name)
when {
explorer_elements[position].isDirectory -> {
setCurrentPath(full_path)
}
explorer_elements[position].isParentFolder -> {
setCurrentPath(FilesUtils.get_parent_path(current_path))
}
isImage(full_path) -> {
startFileViewer(ImageViewer::class.java, full_path)
}
isVideo(full_path) -> {
startFileViewer(VideoPlayer::class.java, full_path)
}
isText(full_path) -> {
startFileViewer(TextEditor::class.java, full_path)
}
isAudio(full_path) -> {
startFileViewer(AudioPlayer::class.java, full_path)
}
else -> {
val dialogListView = layoutInflater.inflate(R.layout.dialog_listview, null)
val listView = dialogListView.findViewById<ListView>(R.id.listview)
val adapter = OpenAsDialogAdapter(this)
listView.adapter = adapter
val dialog = ColoredAlertDialog(this)
.setView(dialogListView)
.setTitle(getString(R.string.open_as))
.setNegativeButton(R.string.cancel, null)
.create()
listView.setOnItemClickListener{_, _, fileTypePosition, _ ->
when (adapter.getItem(fileTypePosition)){
"image" -> startFileViewer(ImageViewer::class.java, full_path)
"video" -> startFileViewer(VideoPlayer::class.java, full_path)
"audio" -> startFileViewer(AudioPlayer::class.java, full_path)
"text" -> startFileViewer(TextEditor::class.java, full_path)
}
dialog.dismiss()
}
dialog.show()
}
}
}
}
invalidateOptionsMenu()
}
private fun sort_explorer_elements() {
when (sort_modes_values[current_sort_mode_index]) {
"name" -> {
explorer_elements.sortWith(Comparator { o1, o2 -> o1.name.compareTo(o2.name) })
}
"size" -> {
explorer_elements.sortWith(Comparator { o1, o2 -> (o1.size - o2.size).toInt() })
}
"date" -> {
explorer_elements.sortWith(Comparator { o1, o2 -> o1.mTime.compareTo(o2.mTime) })
}
"name_desc" -> {
explorer_elements.sortWith(Comparator { o1, o2 -> o2.name.compareTo(o1.name) })
}
"size_desc" -> {
explorer_elements.sortWith(Comparator { o1, o2 -> (o2.size - o1.size).toInt() })
}
"date_desc" -> {
explorer_elements.sortWith(Comparator { o1, o2 -> o2.mTime.compareTo(o1.mTime) })
}
}
shared_prefs_editor.putString(ConstValues.sort_order_key, sort_modes_values[current_sort_mode_index])
shared_prefs_editor.apply()
}
protected fun setCurrentPath(path: String) {
explorer_elements = gocryptfsVolume.list_dir(path)
text_dir_empty.visibility = if (explorer_elements.size == 0) View.VISIBLE else View.INVISIBLE
sort_explorer_elements()
if (path.isNotEmpty()) { //not root
explorer_elements.add(0, ExplorerElement("..", (-1).toShort(), -1, -1))
}
explorer_adapter.setExplorerElements(explorer_elements)
current_path = path
current_path_text.text = getString(R.string.location, current_path)
total_size_text.text = getString(R.string.total_size, FilesUtils.formatSize(explorer_adapter.currentDirectoryTotalSize))
}
private fun askCloseVolume() {
ColoredAlertDialog(this)
.setTitle(R.string.warning)
.setMessage(R.string.ask_close_volume)
.setPositiveButton(R.string.ok) { _, _ -> closeVolumeOnUserExit() }
.setNegativeButton(R.string.cancel, null)
.show()
}
protected open fun closeVolumeOnUserExit() {
finish()
}
protected open fun closeVolumeOnDestroy() {
gocryptfsVolume.close()
TemporaryFileProvider.wipeAll() //additional security
}
override fun onBackPressed() {
if (explorer_adapter.selectedItems.isEmpty()) {
val parent_path = FilesUtils.get_parent_path(current_path)
if (parent_path == current_path) {
askCloseVolume()
} else {
setCurrentPath(FilesUtils.get_parent_path(current_path))
}
} else {
explorer_adapter.unSelectAll()
invalidateOptionsMenu()
}
}
fun createFolder(folder_name: String){
if (folder_name.isEmpty()) {
Toast.makeText(this, R.string.error_filename_empty, Toast.LENGTH_SHORT).show()
} else {
if (!gocryptfsVolume.mkdir(FilesUtils.path_join(current_path, folder_name))) {
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(R.string.error_mkdir)
.setPositiveButton(R.string.ok, null)
.show()
} else {
setCurrentPath(current_path)
invalidateOptionsMenu()
}
}
}
fun onClickAddFolder(view: View?) {
findViewById<FloatingActionMenu>(R.id.fam_explorer).close(true)
val dialog_edit_text_view = layoutInflater.inflate(R.layout.dialog_edit_text, null)
val dialog_edit_text = dialog_edit_text_view.findViewById<EditText>(R.id.dialog_edit_text)
val dialog = ColoredAlertDialog(this)
.setView(dialog_edit_text_view)
.setTitle(R.string.enter_folder_name)
.setPositiveButton(R.string.ok) { _, _ ->
val folder_name = dialog_edit_text.text.toString()
createFolder(folder_name)
}
.setNegativeButton(R.string.cancel, null)
.create()
dialog_edit_text.setOnEditorActionListener { _, _, _ ->
val folder_name = dialog_edit_text.text.toString()
dialog.dismiss()
createFolder(folder_name)
true
}
dialog.window?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE)
dialog.show()
}
fun rename(old_name: String, new_name: String){
if (new_name.isEmpty()) {
Toast.makeText(this, R.string.error_filename_empty, Toast.LENGTH_SHORT).show()
} else {
if (!gocryptfsVolume.rename(FilesUtils.path_join(current_path, old_name), FilesUtils.path_join(current_path, new_name))) {
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(getString(R.string.rename_failed, old_name))
.setPositiveButton(R.string.ok, null)
.show()
} else {
setCurrentPath(current_path)
invalidateOptionsMenu()
}
}
}
fun handle_menu_items(menu: Menu){
menu.findItem(R.id.explorer_menu_rename).isVisible = false
if (usf_open){
menu.findItem(R.id.explorer_menu_external_open)?.isVisible = false
}
val selectedItems = explorer_adapter.selectedItems
if (selectedItems.isEmpty()){
toolbar.navigationIcon = null
menu.findItem(R.id.explorer_menu_close).isVisible = true
menu.findItem(R.id.explorer_menu_sort).isVisible = true
} else {
toolbar.setNavigationIcon(R.drawable.icon_arrow_back)
menu.findItem(R.id.explorer_menu_close).isVisible = false
menu.findItem(R.id.explorer_menu_sort).isVisible = false
if (selectedItems.size == 1) {
menu.findItem(R.id.explorer_menu_rename).isVisible = true
if (usf_open && explorer_elements[selectedItems[0]].isRegularFile) {
menu.findItem(R.id.explorer_menu_external_open)?.isVisible = true
}
}
}
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
return when (item.itemId) {
android.R.id.home -> {
explorer_adapter.unSelectAll()
invalidateOptionsMenu()
true
}
R.id.explorer_menu_sort -> {
ColoredAlertDialog(this)
.setTitle(R.string.sort_order)
.setSingleChoiceItems(sort_modes_entries, current_sort_mode_index) { dialog, which ->
current_sort_mode_index = which
setCurrentPath(current_path)
dialog.dismiss()
}.show()
true
}
R.id.explorer_menu_rename -> {
val dialog_edit_text_view = layoutInflater.inflate(R.layout.dialog_edit_text, null)
val old_name = explorer_elements[explorer_adapter.selectedItems[0]].name
val dialog_edit_text = dialog_edit_text_view.findViewById<EditText>(R.id.dialog_edit_text)
dialog_edit_text.setText(old_name)
dialog_edit_text.selectAll()
val dialog = ColoredAlertDialog(this)
.setView(dialog_edit_text_view)
.setTitle(R.string.rename_title)
.setPositiveButton(R.string.ok) { _, _ ->
val new_name = dialog_edit_text.text.toString()
rename(old_name, new_name)
}
.setNegativeButton(R.string.cancel, null)
.create()
dialog_edit_text.setOnEditorActionListener { _, _, _ ->
val new_name = dialog_edit_text.text.toString()
dialog.dismiss()
rename(old_name, new_name)
true
}
dialog.window?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE)
dialog.show()
true
}
R.id.explorer_menu_external_open -> {
if (usf_open){
ExternalProvider.open(this, gocryptfsVolume, FilesUtils.path_join(current_path, explorer_elements[explorer_adapter.selectedItems[0]].name))
explorer_adapter.unSelectAll()
invalidateOptionsMenu()
}
true
}
R.id.explorer_menu_close -> {
askCloseVolume()
true
}
else -> super.onOptionsItemSelected(item)
}
}
override fun onDestroy() {
super.onDestroy()
if (!isChangingConfigurations) { //activity won't be recreated
closeVolumeOnDestroy()
}
}
override fun onResume() {
super.onResume()
ExternalProvider.clear_cache(this)
}
}

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app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerElement.kt Normal file
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package sushi.hardcore.droidfs.explorers
import java.util.*
class ExplorerElement(val name: String, val elementType: Short, val size: Long, mtime: Long) {
val mTime = Date((mtime * 1000).toString().toLong())
val isDirectory: Boolean
get() = elementType.toInt() == 0
val isParentFolder: Boolean
get() = elementType.toInt() == -1
val isRegularFile: Boolean
get() = elementType.toInt() == 1
}

87
app/src/main/java/sushi/hardcore/droidfs/file_viewers/AudioPlayer.kt Normal file
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package sushi.hardcore.droidfs.file_viewers
import android.media.MediaPlayer
import android.os.Handler
import android.widget.SeekBar
import androidx.core.content.ContextCompat
import kotlinx.android.synthetic.main.activity_audio_player.*
import sushi.hardcore.droidfs.ConstValues
import sushi.hardcore.droidfs.R
import sushi.hardcore.droidfs.widgets.ColoredAlertDialog
import java.io.File
import java.io.IOException
class AudioPlayer: FileViewerActivity(){
private lateinit var player: MediaPlayer
private var isPrepared = false
override fun viewFile() {
setContentView(R.layout.activity_audio_player)
val filename = File(filePath).name
val pos = filename.lastIndexOf('.')
music_title.text = if (pos != -1){
filename.substring(0,pos)
} else {
filename
}
val tmpFileUri = exportFile(filePath)
tmpFileUri?.let {
player = MediaPlayer()
player.setDataSource(this, tmpFileUri)
try {
player.prepare()
isPrepared = true
} catch (e: IOException){
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(getString(R.string.media_player_prepare_failed))
.setCancelable(false)
.setPositiveButton(R.string.ok) { _, _ -> finish() }
.show()
}
if (isPrepared){
player.isLooping = true
button_pause.setOnClickListener {
if (player.isPlaying) {
player.pause()
button_pause.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.icon_play))
} else {
player.start()
button_pause.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.icon_pause))
}
}
button_stop.setOnClickListener { finish() }
seekbar.max = player.duration / ConstValues.seek_bar_inc
val handler = Handler()
runOnUiThread(object : Runnable {
override fun run() {
if (isPrepared) {
seekbar.progress = player.currentPosition / ConstValues.seek_bar_inc
}
handler.postDelayed(this, ConstValues.seek_bar_inc.toLong())
}
})
seekbar.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) {
if (::player.isInitialized && fromUser) {
player.seekTo(progress * ConstValues.seek_bar_inc)
}
}
override fun onStartTrackingTouch(seekBar: SeekBar) {}
override fun onStopTrackingTouch(seekBar: SeekBar) {}
})
player.start()
}
}
}
override fun onDestroy() {
super.onDestroy()
if (::player.isInitialized) {
if (player.isPlaying) {
player.stop()
}
isPrepared = false
player.release()
}
}
}

114
app/src/main/java/sushi/hardcore/droidfs/file_viewers/FileViewerActivity.kt Normal file
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package sushi.hardcore.droidfs.file_viewers
import android.net.Uri
import android.os.Bundle
import android.view.View
import android.view.WindowManager
import androidx.preference.PreferenceManager
import sushi.hardcore.droidfs.ColoredActivity
import sushi.hardcore.droidfs.R
import sushi.hardcore.droidfs.provider.TemporaryFileProvider
import sushi.hardcore.droidfs.util.GocryptfsVolume
import sushi.hardcore.droidfs.util.Wiper
import sushi.hardcore.droidfs.widgets.ColoredAlertDialog
import java.io.File
import java.util.ArrayList
abstract class FileViewerActivity: ColoredActivity() {
var cachedFiles: MutableList<Uri> = ArrayList()
lateinit var gocryptfsVolume: GocryptfsVolume
lateinit var filePath: String
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this)
if (!sharedPrefs.getBoolean("usf_screenshot", false)){
window.setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE)
}
filePath = intent.getStringExtra("path")!!
val sessionID = intent.getIntExtra("sessionID", -1)
gocryptfsVolume = GocryptfsVolume(sessionID)
toggleFullscreen()
viewFile()
}
open fun toggleFullscreen(){
var uiOptions = window.decorView.systemUiVisibility
//uiOptions ^= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
uiOptions = uiOptions xor View.SYSTEM_UI_FLAG_FULLSCREEN
uiOptions = uiOptions xor View.SYSTEM_UI_FLAG_IMMERSIVE
window.decorView.systemUiVisibility = uiOptions
}
abstract fun viewFile()
fun loadWholeFile(path: String): ByteArray? {
val fileSize = gocryptfsVolume.get_size(path)
if (fileSize >= 0){
try {
val fileBuff = ByteArray(fileSize.toInt())
var success = false
val handleID = gocryptfsVolume.open_read_mode(path)
if (handleID != -1) {
var offset: Long = 0
val io_buffer = ByteArray(GocryptfsVolume.DefaultBS)
var length: Int
while (gocryptfsVolume.read_file(handleID, offset, io_buffer).also { length = it } > 0){
System.arraycopy(io_buffer, 0, fileBuff, offset.toInt(), length)
offset += length.toLong()
}
gocryptfsVolume.close_file(handleID)
success = offset == fileBuff.size.toLong()
}
if (success){
return fileBuff
} else {
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(R.string.read_file_failed)
.setCancelable(false)
.setPositiveButton(R.string.ok) { _, _ -> finish() }
.show()
}
} catch (e: OutOfMemoryError){
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(getString(R.string.outofmemoryerror_msg))
.setCancelable(false)
.setPositiveButton(getString(R.string.ok)) { _, _ -> finish() }
.show()
}
} else {
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(R.string.get_size_failed)
.setCancelable(false)
.setPositiveButton(R.string.ok) { _, _ -> finish() }
.show()
}
return null
}
fun exportFile(path: String): Uri? {
val tmpFileUri = TemporaryFileProvider.createFile(this, File(path).name)
cachedFiles.add(tmpFileUri)
return if (gocryptfsVolume.export_file(this, path, tmpFileUri)) {
tmpFileUri
} else {
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(getString(R.string.export_failed, path))
.setCancelable(false)
.setPositiveButton(R.string.ok) { _, _ -> finish() }
.show()
null
}
}
override fun onDestroy() {
super.onDestroy()
Thread{
for (uri in cachedFiles) {
if (Wiper.wipe(this, uri)){
cachedFiles.remove(uri)
}
}
}.start()
}
}

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app/src/main/java/sushi/hardcore/droidfs/file_viewers/ImageViewer.kt Normal file
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package sushi.hardcore.droidfs.file_viewers
import android.graphics.Bitmap
import android.graphics.BitmapFactory
import android.graphics.Matrix
import android.os.Handler
import android.util.DisplayMetrics
import android.view.View
import kotlinx.android.synthetic.main.activity_image_viewer.*
import sushi.hardcore.droidfs.R
class ImageViewer: FileViewerActivity() {
companion object {
private const val hideDelay: Long = 3000
}
private lateinit var bmpImage: Bitmap
private val handler = Handler()
private val hideActionButtons = Runnable { action_buttons.visibility = View.GONE }
override fun viewFile() {
loadWholeFile(filePath)?.let {
val metrics = DisplayMetrics()
windowManager.defaultDisplay.getRealMetrics(metrics)
bmpImage = decodeSampledBitmapFromBuffer(it, metrics.widthPixels, metrics.heightPixels)
setContentView(R.layout.activity_image_viewer)
image_viewer.setImageBitmap(bmpImage)
handler.postDelayed(hideActionButtons, hideDelay)
}
}
private fun calculateInSampleSize(options: BitmapFactory.Options, reqWidth: Int, reqHeight: Int): Int {
var inSampleSize = 1
if (options.outHeight > reqHeight || options.outWidth > reqWidth){
val halfHeight = options.outHeight/2
val halfWidth = options.outWidth/2
while (halfHeight/inSampleSize >= reqHeight && halfWidth/inSampleSize >= reqWidth){
inSampleSize *= 2
}
}
return inSampleSize
}
private fun decodeSampledBitmapFromBuffer(buff: ByteArray, reqWidth: Int, reqHeight: Int): Bitmap {
return BitmapFactory.Options().run {
inJustDecodeBounds = true
BitmapFactory.decodeByteArray(buff, 0, buff.size, this)
inSampleSize = calculateInSampleSize(this, reqWidth, reqHeight)
inJustDecodeBounds = false
BitmapFactory.decodeByteArray(buff, 0, buff.size, this)
}
}
private fun rotateImage(degrees: Float){
val matrix = Matrix()
matrix.postRotate(degrees)
bmpImage = Bitmap.createBitmap(bmpImage, 0, 0, bmpImage.width, bmpImage.height, matrix, true)
image_viewer.setImageBitmap(bmpImage)
}
fun onCLickRotateRight(view: View){
rotateImage(90F)
}
fun onClickRotateLeft(view: View){
rotateImage(-90F)
}
override fun onUserInteraction() {
super.onUserInteraction()
if (action_buttons.visibility == View.GONE){
action_buttons.visibility = View.VISIBLE
handler.removeCallbacks(hideActionButtons)
handler.postDelayed(hideActionButtons, hideDelay)
}
}
}

147
app/src/main/java/sushi/hardcore/droidfs/file_viewers/TextEditor.kt Normal file
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package sushi.hardcore.droidfs.file_viewers
import android.text.Editable
import android.text.TextWatcher
import android.view.Menu
import android.view.MenuItem
import android.widget.EditText
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.widget.Toolbar
import sushi.hardcore.droidfs.R
import sushi.hardcore.droidfs.util.GocryptfsVolume
import sushi.hardcore.droidfs.widgets.ColoredAlertDialog
import java.io.ByteArrayInputStream
import java.io.File
class TextEditor: FileViewerActivity() {
private lateinit var fileName: String
private lateinit var editor: EditText
private lateinit var toolbar: Toolbar
private lateinit var titleText: TextView
private var changedSinceLastSave = false
private var wordWrap = true
override fun toggleFullscreen() {
//don't toggle fullscreen
}
override fun viewFile() {
loadWholeFile(filePath)?.let {
fileName = File(filePath).name
try {
loadLayout(String(it))
} catch (e: OutOfMemoryError){
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(getString(R.string.outofmemoryerror_msg))
.setCancelable(false)
.setPositiveButton(getString(R.string.ok)) { _, _ -> finish() }
.show()
}
}
}
private fun loadLayout(fileContent: String){
if (wordWrap){
setContentView(R.layout.activity_text_editor_wrap)
} else {
setContentView(R.layout.activity_text_editor)
}
toolbar = findViewById(R.id.toolbar)
setSupportActionBar(toolbar)
title = ""
titleText = findViewById(R.id.title_text)
titleText.text = fileName
editor = findViewById(R.id.text_editor)
editor.setText(fileContent)
editor.addTextChangedListener(object: TextWatcher {
override fun afterTextChanged(s: Editable?) {
}
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
if (!changedSinceLastSave){
changedSinceLastSave = true
titleText.text = "*$fileName"
}
}
})
}
private fun save(): Boolean{
var success = false
val content = editor.text.toString().toByteArray()
val handleID = gocryptfsVolume.open_write_mode(filePath)
if (handleID != -1){
val buff = ByteArrayInputStream(content)
var offset: Long = 0
val io_buffer = ByteArray(GocryptfsVolume.DefaultBS)
var length: Int
while (buff.read(io_buffer).also { length = it } > 0) {
val written = gocryptfsVolume.write_file(handleID, offset, io_buffer, length).toLong()
if (written == length.toLong()) {
offset += written
} else {
break
}
}
if (offset == content.size.toLong()){
success = gocryptfsVolume.truncate(filePath, offset)
}
gocryptfsVolume.close_file(handleID)
buff.close()
}
if (success){
Toast.makeText(this, getString(R.string.file_saved), Toast.LENGTH_SHORT).show()
} else {
Toast.makeText(this, getString(R.string.save_failed), Toast.LENGTH_SHORT).show()
}
return success
}
private fun checkSaveAndExit(){
if (changedSinceLastSave){
ColoredAlertDialog(this)
.setTitle(R.string.warning)
.setMessage(getString(R.string.ask_save))
.setPositiveButton(getString(R.string.save)) { _, _ ->
if (save()){
finish()
}
}
.setNegativeButton(getString(R.string.discard)){ _, _ -> finish() }
.show()
} else {
finish()
}
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
menuInflater.inflate(R.menu.text_editor, menu)
toolbar.setNavigationIcon(R.drawable.icon_arrow_back)
menu.findItem(R.id.word_wrap).isChecked = wordWrap
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
when (item.itemId){
android.R.id.home -> {
checkSaveAndExit()
}
R.id.menu_save -> {
if (save()){
changedSinceLastSave = false
titleText.text = fileName
}
}
R.id.word_wrap -> {
wordWrap = !item.isChecked
loadLayout(editor.text.toString())
invalidateOptionsMenu()
}
else -> super.onOptionsItemSelected(item)
}
return true
}
override fun onBackPressed() {
checkSaveAndExit()
}
}

27
app/src/main/java/sushi/hardcore/droidfs/file_viewers/VideoPlayer.kt Normal file
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package sushi.hardcore.droidfs.file_viewers
import android.widget.MediaController
import kotlinx.android.synthetic.main.activity_video_player.*
import sushi.hardcore.droidfs.R
import sushi.hardcore.droidfs.widgets.ColoredAlertDialog
class VideoPlayer: FileViewerActivity() {
override fun viewFile() {
val mc = MediaController(this)
setContentView(R.layout.activity_video_player)
mc.setAnchorView(video_player)
video_player.setOnErrorListener { _, _, _ ->
ColoredAlertDialog(this)
.setTitle(R.string.error)
.setMessage(getString(R.string.video_play_failed))
.setCancelable(false)
.setPositiveButton(R.string.ok) { _, _ -> finish() }
.show()
true
}
val tmpFileUri = exportFile(filePath)
video_player.setVideoURI(tmpFileUri)
video_player.setMediaController(mc)
video_player.start()
}
}

31
app/src/main/java/sushi/hardcore/droidfs/fingerprint_stuff/FingerprintFragment.kt Normal file
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package sushi.hardcore.droidfs.fingerprint_stuff
import android.content.DialogInterface
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.fragment.app.DialogFragment
import sushi.hardcore.droidfs.R
class FingerprintFragment(val volume_path: String, val action_description: String, val callbackOnDismiss: () -> Unit) : DialogFragment() {
lateinit var image_fingerprint: ImageView
lateinit var text_instruction: TextView
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val view = inflater.inflate(R.layout.fragment_fingerprint, container, false)
val text_volume = view.findViewById<TextView>(R.id.text_volume)
text_volume.text = volume_path
image_fingerprint = view.findViewById(R.id.image_fingerprint)
val text_action_description = view.findViewById<TextView>(R.id.text_action_description)
text_action_description.text = action_description
text_instruction = view.findViewById(R.id.text_instruction)
return view
}
override fun onDismiss(dialog: DialogInterface) {
super.onDismiss(dialog)
callbackOnDismiss()
}
}

33
app/src/main/java/sushi/hardcore/droidfs/fingerprint_stuff/FingerprintHandler.kt Normal file
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package sushi.hardcore.droidfs.fingerprint_stuff
import android.content.Context
import android.hardware.fingerprint.FingerprintManager
import android.os.Build
import android.os.CancellationSignal
import android.util.Log
import android.widget.Toast
import androidx.annotation.RequiresApi
@RequiresApi(Build.VERSION_CODES.M)
class FingerprintHandler(private val context: Context) : FingerprintManager.AuthenticationCallback(){
private lateinit var cancellationSignal: CancellationSignal
private lateinit var onTouched: (resultCode: onTouchedResultCodes) -> Unit
fun startAuth(fingerprintManager: FingerprintManager, cryptoObject: FingerprintManager.CryptoObject, onTouched: (resultCode: onTouchedResultCodes) -> Unit){
cancellationSignal = CancellationSignal()
this.onTouched = onTouched
fingerprintManager.authenticate(cryptoObject, cancellationSignal, 0, this, null)
}
override fun onAuthenticationSucceeded(result: FingerprintManager.AuthenticationResult?) {
onTouched(onTouchedResultCodes.SUCCEED)
}
override fun onAuthenticationError(errorCode: Int, errString: CharSequence?) {
onTouched(onTouchedResultCodes.ERROR)
}
override fun onAuthenticationFailed() {
onTouched(onTouchedResultCodes.FAILED)
}
}

261
app/src/main/java/sushi/hardcore/droidfs/fingerprint_stuff/FingerprintPasswordHashSaver.kt Normal file
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package sushi.hardcore.droidfs.fingerprint_stuff
import android.Manifest
import android.app.KeyguardManager
import android.content.Context
import android.content.DialogInterface
import android.content.SharedPreferences
import android.content.pm.PackageManager
import android.hardware.biometrics.BiometricPrompt
import android.hardware.fingerprint.FingerprintManager
import android.os.Build
import android.os.CancellationSignal
import android.os.Handler
import android.security.keystore.KeyGenParameterSpec
import android.security.keystore.KeyProperties
import android.util.Base64
import android.util.Log
import android.widget.Toast
import androidx.annotation.RequiresApi
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.app.AppCompatActivity
import androidx.core.content.ContextCompat
import sushi.hardcore.droidfs.ConstValues
import sushi.hardcore.droidfs.R
import sushi.hardcore.droidfs.widgets.ColoredAlertDialog
import java.security.KeyStore
import javax.crypto.*
import javax.crypto.spec.GCMParameterSpec
@RequiresApi(Build.VERSION_CODES.M)
class FingerprintPasswordHashSaver(private val activityContext: AppCompatActivity, private val shared_prefs: SharedPreferences) {
private var isPrepared = false
var isListening = false
var authenticationFailed = false
private val shared_prefs_editor: SharedPreferences.Editor = shared_prefs.edit()
private val fingerprintManager = activityContext.getSystemService(Context.FINGERPRINT_SERVICE) as FingerprintManager
private lateinit var root_cipher_dir: String
private lateinit var action_description: String
private lateinit var onAuthenticationResult: (success: Boolean) -> Unit
private lateinit var onPasswordDecrypted: (password: ByteArray) -> Unit
private lateinit var keyStore: KeyStore
private lateinit var key: SecretKey
lateinit var fingerprintFragment: FingerprintFragment
private val handler = Handler()
private lateinit var cancellationSignal: CancellationSignal
private var actionMode: Int? = null
private lateinit var dataToProcess: ByteArray
private lateinit var cipher: Cipher
companion object {
private const val ANDROID_KEY_STORE = "AndroidKeyStore"
private const val KEY_ALIAS = "Hash Key"
private const val KEY_SIZE = 256
private const val GCM_TAG_LEN = 128
private const val CIPHER_TYPE = "AES/GCM/NoPadding"
private const val SUCCESS_DISMISS_DIALOG_DELAY: Long = 400
private const val FAILED_DISMISS_DIALOG_DELAY: Long = 800
}
private fun reset_hash_storage() {
keyStore.deleteEntry(KEY_ALIAS)
val saved_volume_paths = shared_prefs.getStringSet(ConstValues.saved_volumes_key, HashSet<String>()) as Set<String>
for (path in saved_volume_paths){
val saved_hash = shared_prefs.getString(path, null)
if (saved_hash != null){
shared_prefs_editor.remove(path)
}
}
shared_prefs_editor.apply()
Toast.makeText(activityContext, activityContext.getString(R.string.hash_storage_reset), Toast.LENGTH_SHORT).show()
}
fun canAuthenticate(): Boolean{
if (ContextCompat.checkSelfPermission(activityContext, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED){
Toast.makeText(activityContext, activityContext.getString(R.string.fingerprint_perm_denied), Toast.LENGTH_SHORT).show()
} else if (!fingerprintManager.isHardwareDetected){
Toast.makeText(activityContext, activityContext.getString(R.string.no_fingerprint_sensor), Toast.LENGTH_SHORT).show()
} else {
val keyguardManager = activityContext.getSystemService(Context.KEYGUARD_SERVICE) as KeyguardManager
if (!keyguardManager.isKeyguardSecure || !fingerprintManager.hasEnrolledFingerprints()) {
Toast.makeText(activityContext, activityContext.getString(R.string.no_fingerprint_configured), Toast.LENGTH_SHORT).show()
} else {
return true
}
}
return false
}
private fun prepare() {
keyStore = KeyStore.getInstance(ANDROID_KEY_STORE)
keyStore.load(null)
key = if (keyStore.containsAlias(KEY_ALIAS)){
keyStore.getKey(KEY_ALIAS, null) as SecretKey
} else {
val builder = KeyGenParameterSpec.Builder(KEY_ALIAS, KeyProperties.PURPOSE_ENCRYPT or KeyProperties.PURPOSE_DECRYPT)
builder.setBlockModes(KeyProperties.BLOCK_MODE_GCM)
builder.setKeySize(KEY_SIZE)
builder.setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_NONE)
builder.setUserAuthenticationRequired(true)
val keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, ANDROID_KEY_STORE)
keyGenerator.init(builder.build())
keyGenerator.generateKey()
}
cipher = Cipher.getInstance(CIPHER_TYPE)
fingerprintFragment = FingerprintFragment(root_cipher_dir, action_description, ::stopListening)
isPrepared = true
}
fun encryptAndSave(plainText: ByteArray, root_cipher_dir: String, onAuthenticationResult: (success: Boolean) -> Unit){
if (shared_prefs.getString(root_cipher_dir, null) == null){
this.root_cipher_dir = root_cipher_dir
this.action_description = activityContext.getString(R.string.encrypt_action_description)
this.onAuthenticationResult = onAuthenticationResult
if (!isPrepared){
prepare()
}
dataToProcess = plainText
actionMode = Cipher.ENCRYPT_MODE
cipher.init(Cipher.ENCRYPT_MODE, key)
startListening()
}
}
fun decrypt(cipherText: String, root_cipher_dir: String, onPasswordDecrypted: (password: ByteArray) -> Unit){
this.root_cipher_dir = root_cipher_dir
this.action_description = activityContext.getString(R.string.decrypt_action_description)
this.onPasswordDecrypted = onPasswordDecrypted
if (!isPrepared){
prepare()
}
actionMode = Cipher.DECRYPT_MODE
val encodedElements = cipherText.split(":")
dataToProcess = Base64.decode(encodedElements[1], 0)
val iv = Base64.decode(encodedElements[0], 0)
val gcmSpec = GCMParameterSpec(GCM_TAG_LEN, iv)
cipher.init(Cipher.DECRYPT_MODE, key, gcmSpec)
startListening()
}
private fun startListening(){
cancellationSignal = CancellationSignal()
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
val biometricPrompt = BiometricPrompt.Builder(activityContext)
.setTitle(root_cipher_dir)
.setSubtitle(action_description)
.setDescription(activityContext.getString(R.string.fingerprint_instruction))
.setNegativeButton(activityContext.getString(R.string.cancel), activityContext.mainExecutor, DialogInterface.OnClickListener{_, _ ->
cancellationSignal.cancel()
callbackOnAuthenticationFailed() //toggle on onAuthenticationResult
}).build()
biometricPrompt.authenticate(BiometricPrompt.CryptoObject(cipher), cancellationSignal, activityContext.mainExecutor, object: BiometricPrompt.AuthenticationCallback(){
override fun onAuthenticationError(errorCode: Int, errString: CharSequence?) {
callbackOnAuthenticationError()
}
override fun onAuthenticationFailed() {
callbackOnAuthenticationFailed()
}
override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult?) {
callbackOnAuthenticationSucceeded()
}
})
} else {
fingerprintFragment.show(activityContext.supportFragmentManager, null)
fingerprintManager.authenticate(FingerprintManager.CryptoObject(cipher), cancellationSignal, 0, object: FingerprintManager.AuthenticationCallback(){
override fun onAuthenticationError(errorCode: Int, errString: CharSequence?) {
callbackOnAuthenticationError()
}
override fun onAuthenticationFailed() {
callbackOnAuthenticationFailed()
}
override fun onAuthenticationSucceeded(result: FingerprintManager.AuthenticationResult?) {
callbackOnAuthenticationSucceeded()
}
}, null)
}
isListening = true
}
fun stopListening(){
cancellationSignal.cancel()
isListening = false
}
fun callbackOnAuthenticationError() {
if (!authenticationFailed){
if (fingerprintFragment.isAdded){
fingerprintFragment.image_fingerprint.setColorFilter(ContextCompat.getColor(activityContext, R.color.fingerprint_failed))
fingerprintFragment.text_instruction.setText(activityContext.getString(R.string.authentication_error))
handler.postDelayed({ fingerprintFragment.dismiss() }, 1000)
}
if (actionMode == Cipher.ENCRYPT_MODE){
handler.postDelayed({ onAuthenticationResult(false) }, FAILED_DISMISS_DIALOG_DELAY)
}
}
}
fun callbackOnAuthenticationFailed() {
authenticationFailed = true
if (fingerprintFragment.isAdded){
fingerprintFragment.image_fingerprint.setColorFilter(ContextCompat.getColor(activityContext, R.color.fingerprint_failed))
fingerprintFragment.text_instruction.text = activityContext.getString(R.string.authentication_failed)
handler.postDelayed({ fingerprintFragment.dismiss() }, FAILED_DISMISS_DIALOG_DELAY)
stopListening()
} else {
handler.postDelayed({ stopListening() }, FAILED_DISMISS_DIALOG_DELAY)
}
if (actionMode == Cipher.ENCRYPT_MODE){
handler.postDelayed({ onAuthenticationResult(false) }, FAILED_DISMISS_DIALOG_DELAY)
}
}
fun callbackOnAuthenticationSucceeded() {
if (fingerprintFragment.isAdded){
fingerprintFragment.image_fingerprint.setColorFilter(ContextCompat.getColor(activityContext, R.color.fingerprint_success))
fingerprintFragment.text_instruction.text = activityContext.getString(R.string.authenticated)
}
try {
when (actionMode) {
Cipher.ENCRYPT_MODE -> {
val cipherText = cipher.doFinal(dataToProcess)
val encodedCipherText = Base64.encodeToString(cipherText, 0)
val encodedIv = Base64.encodeToString(cipher.iv, 0)
shared_prefs_editor.putString(root_cipher_dir, "$encodedIv:$encodedCipherText")
shared_prefs_editor.apply()
handler.postDelayed({
if (fingerprintFragment.isAdded){
fingerprintFragment.dismiss()
}
onAuthenticationResult(true)
}, SUCCESS_DISMISS_DIALOG_DELAY)
}
Cipher.DECRYPT_MODE -> {
try {
val plainText = cipher.doFinal(dataToProcess)
handler.postDelayed({
if (fingerprintFragment.isAdded){
fingerprintFragment.dismiss()
}
onPasswordDecrypted(plainText)
}, SUCCESS_DISMISS_DIALOG_DELAY)
} catch (e: AEADBadTagException){
ColoredAlertDialog(activityContext)
.setTitle(R.string.error)
.setMessage(activityContext.getString(R.string.MAC_verification_failed))
.setPositiveButton(activityContext.getString(R.string.reset_hash_storage)) { _, _ ->
reset_hash_storage()
}
.setNegativeButton(R.string.cancel, null)
.show()
}
}
}
} catch (e: IllegalBlockSizeException){
stopListening()
ColoredAlertDialog(activityContext)
.setTitle(R.string.authentication_error)
.setMessage(activityContext.getString(R.string.authentication_error_msg))
.setPositiveButton(activityContext.getString(R.string.reset_hash_storage)) { _, _ ->
reset_hash_storage()
}
.setNegativeButton(R.string.cancel, null)
.show()
}
}
}

7
app/src/main/java/sushi/hardcore/droidfs/fingerprint_stuff/onTouchedResultCodes.kt Normal file
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@ -0,0 +1,7 @@
package sushi.hardcore.droidfs.fingerprint_stuff
enum class onTouchedResultCodes {
SUCCEED,
FAILED,
ERROR
}

326
app/src/main/java/sushi/hardcore/droidfs/provider/TemporaryFileProvider.java Normal file
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/*
* Copyright (C) 2017 Schürmann & Breitmoser GbR
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package sushi.hardcore.droidfs.provider;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import android.annotation.SuppressLint;
import android.app.Application;
import android.content.ClipDescription;
import android.content.ContentProvider;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.MatrixCursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.net.Uri;
import android.os.Build;
import android.os.ParcelFileDescriptor;
import android.provider.MediaStore;
import android.util.Log;
import androidx.annotation.NonNull;
import sushi.hardcore.droidfs.BuildConfig;
import sushi.hardcore.droidfs.util.DatabaseUtil;
import sushi.hardcore.droidfs.util.Wiper;
/**
* Borrowed from OpenKeyChain
* I removed the scheduled cleanup because it requires unwanted permissions and doesn't work very well.
* But don't panic ! The "clear_cache" function from ExternalProvider do the same job when needed.
**/
/**
* TemporaryStorageProvider stores decrypted files inside the app's cache directory previously to
* sharing them with other applications.
* <p/>
* Security:
* - It is writable by OpenKeychain only (see Manifest), but exported for reading files
* - It uses UUIDs as identifiers which makes predicting files from outside impossible
* - Querying a number of files is not allowed, only querying single files
* -> You can only open a file if you know the Uri containing the precise UUID, this Uri is only
* revealed when the user shares a decrypted file with another app.
* <p/>
* Why is support lib's FileProvider not used?
* Because granting Uri permissions temporarily does not work correctly. See
* - https://code.google.com/p/android/issues/detail?id=76683
* - https://github.com/nmr8acme/FileProvider-permission-bug
* - http://stackoverflow.com/q/24467696
* - http://stackoverflow.com/q/18249007
* - Comments at http://www.blogc.at/2014/03/23/share-private-files-with-other-apps-fileprovider/
*/
public class TemporaryFileProvider extends ContentProvider {
private static final int TEMPFILE_TTL = 10 * 60 * 1000; // 10 minutes
private static final String DB_NAME = "tempstorage.db";
private static final String TABLE_FILES = "files";
public static final String AUTHORITY = BuildConfig.APPLICATION_ID + ".tempstorage";
public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY);
private static final int DB_VERSION = 3;
interface TemporaryFileColumns {
String COLUMN_UUID = "id";
String COLUMN_NAME = "name";
String COLUMN_TIME = "time";
String COLUMN_TYPE = "mimetype";
}
private static final String TEMP_FILES_DIR = "temp";
private static File tempFilesDir;
private static Pattern UUID_PATTERN = Pattern.compile("[a-fA-F0-9-]+");
public static void wipeAll(){
for (File f: tempFilesDir.listFiles()){
Wiper.wipe(f);
}
}
public static Uri createFile(Context context, String targetName, String mimeType) {
ContentResolver contentResolver = context.getContentResolver();
ContentValues contentValues = new ContentValues();
contentValues.put(TemporaryFileColumns.COLUMN_NAME, targetName);
contentValues.put(TemporaryFileColumns.COLUMN_TYPE, mimeType);
contentValues.put(TemporaryFileColumns.COLUMN_TIME, System.currentTimeMillis());
Uri resultUri = contentResolver.insert(CONTENT_URI, contentValues);
//scheduleCleanupAfterTtl(context);
return resultUri;
}
public static Uri createFile(Context context, String targetName) {
return createFile(context, targetName, null);
}
public static Uri createFile(Context context) {
ContentValues contentValues = new ContentValues();
return context.getContentResolver().insert(CONTENT_URI, contentValues);
}
public static int setName(Context context, Uri uri, String name) {
ContentValues values = new ContentValues();
values.put(TemporaryFileColumns.COLUMN_NAME, name);
return context.getContentResolver().update(uri, values, null, null);
}
public static int setMimeType(Context context, Uri uri, String mimetype) {
ContentValues values = new ContentValues();
values.put(TemporaryFileColumns.COLUMN_TYPE, mimetype);
return context.getContentResolver().update(uri, values, null, null);
}
private static class TemporaryStorageDatabase extends SQLiteOpenHelper {
public TemporaryStorageDatabase(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE IF NOT EXISTS " + TABLE_FILES + " (" +
TemporaryFileColumns.COLUMN_UUID + " TEXT PRIMARY KEY, " +
TemporaryFileColumns.COLUMN_NAME + " TEXT, " +
TemporaryFileColumns.COLUMN_TYPE + " TEXT, " +
TemporaryFileColumns.COLUMN_TIME + " INTEGER" +
");");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
switch (oldVersion) {
case 1:
db.execSQL("DROP TABLE IF EXISTS files");
db.execSQL("CREATE TABLE IF NOT EXISTS " + TABLE_FILES + " (" +
TemporaryFileColumns.COLUMN_UUID + " TEXT PRIMARY KEY, " +
TemporaryFileColumns.COLUMN_NAME + " TEXT, " +
TemporaryFileColumns.COLUMN_TIME + " INTEGER" +
");");
case 2:
db.execSQL("ALTER TABLE files ADD COLUMN " + TemporaryFileColumns.COLUMN_TYPE + " TEXT");
}
}
}
private static TemporaryStorageDatabase db;
private File getFile(Uri uri) throws FileNotFoundException {
try {
return getFile(uri.getLastPathSegment());
} catch (NumberFormatException e) {
throw new FileNotFoundException();
}
}
private File getFile(String id) {
Matcher m = UUID_PATTERN.matcher(id);
if (!m.matches()) {
throw new SecurityException("Can only open temporary files with UUIDs!");
}
return new File(tempFilesDir, id);
}
@Override
public boolean onCreate() {
db = new TemporaryStorageDatabase(getContext());
tempFilesDir = new File(getContext().getCacheDir(), TEMP_FILES_DIR);
return tempFilesDir.mkdirs();
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
if (uri.getLastPathSegment() == null) {
throw new SecurityException("Listing temporary files is not allowed, only querying single files.");
}
File file;
try {
file = getFile(uri);
} catch (FileNotFoundException e) {
return null;
}
Cursor fileName = db.getReadableDatabase().query(TABLE_FILES,
new String[]{TemporaryFileColumns.COLUMN_NAME},
TemporaryFileColumns.COLUMN_UUID + "=?",
new String[]{uri.getLastPathSegment()}, null, null, null);
if (fileName != null) {
if (fileName.moveToNext()) {
MatrixCursor cursor = new MatrixCursor(new String[]{
MediaStore.MediaColumns.DISPLAY_NAME,
MediaStore.MediaColumns.SIZE,
MediaStore.MediaColumns.DATA,
});
cursor.newRow()
.add(fileName.getString(0))
.add(file.length())
.add(file.getAbsolutePath());
fileName.close();
return cursor;
}
fileName.close();
}
return null;
}
@Override
public String getType(Uri uri) {
Cursor cursor = db.getReadableDatabase().query(TABLE_FILES,
new String[]{TemporaryFileColumns.COLUMN_TYPE},
TemporaryFileColumns.COLUMN_UUID + "=?",
new String[]{uri.getLastPathSegment()}, null, null, null);
if (cursor != null) {
try {
if (cursor.moveToNext()) {
if (!cursor.isNull(0)) {
return cursor.getString(0);
}
}
} finally {
cursor.close();
}
}
return "application/octet-stream";
}
@Override
public String[] getStreamTypes(Uri uri, String mimeTypeFilter) {
String type = getType(uri);
if (ClipDescription.compareMimeTypes(type, mimeTypeFilter)) {
return new String[]{type};
}
return null;
}
@Override
public Uri insert(Uri uri, ContentValues values) {
String uuid = UUID.randomUUID().toString();
values.put(TemporaryFileColumns.COLUMN_UUID, uuid);
int insert = (int) db.getWritableDatabase().insert(TABLE_FILES, null, values);
if (insert == -1) {
return null;
}
try {
getFile(uuid).createNewFile();
} catch (IOException e) {
return null;
}
return Uri.withAppendedPath(CONTENT_URI, uuid);
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
if (uri == null) {
return 0;
}
String fileUuidFromUri = uri.getLastPathSegment();
if (fileUuidFromUri != null) {
selection = DatabaseUtil.concatenateWhere(selection, TemporaryFileColumns.COLUMN_UUID + "=?");
selectionArgs = DatabaseUtil.appendSelectionArgs(selectionArgs, new String[]{ fileUuidFromUri });
}
Cursor files = db.getReadableDatabase().query(TABLE_FILES, new String[]{TemporaryFileColumns.COLUMN_UUID}, selection,
selectionArgs, null, null, null);
if (files != null) {
while (files.moveToNext()) {
getFile(files.getString(0)).delete();
}
files.close();
return db.getWritableDatabase().delete(TABLE_FILES, selection, selectionArgs);
}
return 0;
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
if (values.size() != 1) {
throw new UnsupportedOperationException("Update supported only for one field at a time!");
}
if (!values.containsKey(TemporaryFileColumns.COLUMN_NAME) && !values.containsKey(TemporaryFileColumns.COLUMN_TYPE)) {
throw new UnsupportedOperationException("Update supported only for name and type field!");
}
if (selection != null || selectionArgs != null) {
throw new UnsupportedOperationException("Update supported only for plain uri!");
}
return db.getWritableDatabase().update(TABLE_FILES, values,
TemporaryFileColumns.COLUMN_UUID + " = ?", new String[]{uri.getLastPathSegment()});
}
@Override
public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
return openFileHelper(uri, mode);
}
}

84
app/src/main/java/sushi/hardcore/droidfs/util/DatabaseUtil.java Normal file
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/*
* Copyright (C) 2017 Schürmann & Breitmoser GbR
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package sushi.hardcore.droidfs.util;
import androidx.sqlite.db.SupportSQLiteDatabase;
import android.database.Cursor;
import android.text.TextUtils;
/**
* Borrowed from OpenKeyChain
*/
/**
* Shamelessly copied from android.database.DatabaseUtils
*/
public class DatabaseUtil {
/**
* Concatenates two SQL WHERE clauses, handling empty or null values.
*/
public static String concatenateWhere(String a, String b) {
if (TextUtils.isEmpty(a)) {
return b;
}
if (TextUtils.isEmpty(b)) {
return a;
}
return "(" + a + ") AND (" + b + ")";
}
/**
* Appends one set of selection args to another. This is useful when adding a selection
* argument to a user provided set.
*/
public static String[] appendSelectionArgs(String[] originalValues, String[] newValues) {
if (originalValues == null || originalValues.length == 0) {
return newValues;
}
String[] result = new String[originalValues.length + newValues.length ];
System.arraycopy(originalValues, 0, result, 0, originalValues.length);
System.arraycopy(newValues, 0, result, originalValues.length, newValues.length);
return result;
}
public static void explainQuery(SupportSQLiteDatabase db, String sql) {
Cursor explainCursor = db.query("EXPLAIN QUERY PLAN " + sql, new String[0]);
// this is a debugging feature, we can be a little careless
explainCursor.moveToFirst();
StringBuilder line = new StringBuilder();
for (int i = 0; i < explainCursor.getColumnCount(); i++) {
line.append(explainCursor.getColumnName(i)).append(", ");
}
while (!explainCursor.isAfterLast()) {
line = new StringBuilder();
for (int i = 0; i < explainCursor.getColumnCount(); i++) {
line.append(explainCursor.getString(i)).append(", ");
}
explainCursor.moveToNext();
}
explainCursor.close();
}
}

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