1ff4ae56c1
This keeps the README working even if nuetzlich.net is unavailable. We use a PNG because github disallows embedding local SVGs.
366 lines
16 KiB
Markdown
366 lines
16 KiB
Markdown
[![gocryptfs](Documentation/gocryptfs-logo.png)](https://nuetzlich.net/gocryptfs/)
|
|
[![Build Status](https://travis-ci.org/rfjakob/gocryptfs.svg?branch=master)](https://travis-ci.org/rfjakob/gocryptfs)
|
|
[![MIT License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
|
|
[![Go Report Card](https://goreportcard.com/badge/github.com/rfjakob/gocryptfs)](https://goreportcard.com/report/github.com/rfjakob/gocryptfs)
|
|
|
|
An encrypted overlay filesystem written in Go.
|
|
Official website: https://nuetzlich.net/gocryptfs (Markdown [source](https://github.com/rfjakob/gocryptfs-website/tree/master/docs))
|
|
|
|
gocryptfs is built on top the excellent
|
|
[go-fuse](https://github.com/hanwen/go-fuse) FUSE library and its
|
|
LoopbackFileSystem API.
|
|
|
|
This project was inspired by EncFS and strives to fix its security
|
|
issues while providing good performance
|
|
([benchmarks](https://nuetzlich.net/gocryptfs/comparison/#performance)).
|
|
|
|
For details on the security of gocryptfs see the
|
|
[Security](https://nuetzlich.net/gocryptfs/security/) design document.
|
|
|
|
All tags from v0.4 onward are signed by the *gocryptfs signing key*.
|
|
Please check [Signed Releases](https://nuetzlich.net/gocryptfs/releases/)
|
|
for details.
|
|
|
|
Current Status
|
|
--------------
|
|
|
|
gocryptfs has reached version 1.0 on Jul 17, 2016. It has gone through
|
|
hours and hours of stress (fsstress, extractloop.bash) and correctness
|
|
testing (xfstests). It is now considered ready for general consumption.
|
|
|
|
The old principle still applies: Important data should have a backup.
|
|
Also, keep a copy of your master key (printed on mount) in a safe place.
|
|
This allows you to access the data even if the gocryptfs.conf config
|
|
file is damaged or you lose the password.
|
|
|
|
Platforms
|
|
---------
|
|
|
|
Linux is gocryptfs' native platform.
|
|
|
|
Experimental Mac OS X support is available, check out
|
|
[ticket #15](https://github.com/rfjakob/gocryptfs/issues/15) for
|
|
details.
|
|
|
|
For Windows, an independent C++ reimplementation has been started:
|
|
[cppcryptfs](https://github.com/bailey27/cppcryptfs)
|
|
|
|
Testing
|
|
-------
|
|
|
|
gocryptfs comes with is own test suite that is constantly expanded as features are
|
|
added. Run it using `./test.bash`. It takes about 1 minute and requires FUSE
|
|
as it mounts several test filesystems.
|
|
|
|
The `stress_tests` directory contains stress tests that run indefinitely.
|
|
|
|
In addition, I have ported `xfstests` to FUSE, the result is the
|
|
[fuse-xfstests](https://github.com/rfjakob/fuse-xfstests) project. gocryptfs
|
|
passes the "generic" tests with one exception, results: [XFSTESTS.md](Documentation/XFSTESTS.md)
|
|
|
|
A lot of work has gone into this. The testing has found bugs in gocryptfs
|
|
as well as in the go-fuse library.
|
|
|
|
Compile
|
|
-------
|
|
|
|
$ go get -d github.com/rfjakob/gocryptfs
|
|
$ cd $(go env GOPATH)/src/github.com/rfjakob/gocryptfs
|
|
$ ./build.bash
|
|
|
|
Or, if you don't have OpenSSL installed:
|
|
|
|
$ ./build-without-openssl.bash
|
|
|
|
Use
|
|
---
|
|
|
|
$ mkdir cipher plain
|
|
$ ./gocryptfs -init cipher
|
|
$ ./gocryptfs cipher plain
|
|
|
|
See the [Quickstart](https://nuetzlich.net/gocryptfs/quickstart/) page for more info.
|
|
|
|
The [MANPAGE.md](Documentation/MANPAGE.md) describes all available command-line options.
|
|
|
|
Graphical Interface
|
|
-------------------
|
|
|
|
The [SiriKali](https://mhogomchungu.github.io/sirikali/) project supports
|
|
gocryptfs and runs on Linux and OSX.
|
|
|
|
[cppcryptfs](https://github.com/bailey27/cppcryptfs) on Windows provides
|
|
its own GUI.
|
|
|
|
Stable CLI ABI
|
|
--------------
|
|
|
|
If you want to call gocryptfs from your app or script, see
|
|
[CLI_ABI.md](Documentation/CLI_ABI.md) for the official stable
|
|
ABI. This ABI is regression-tested by the test suite.
|
|
|
|
Storage Overhead
|
|
----------------
|
|
|
|
* Empty files take 0 bytes on disk
|
|
* 18 byte file header for non-empty files (2 bytes version, 16 bytes random file id)
|
|
* 32 bytes of storage overhead per 4kB block (16 byte nonce, 16 bytes auth tag)
|
|
|
|
[file-format.md](Documentation/file-format.md) contains a more detailed description.
|
|
|
|
Performance
|
|
-----------
|
|
|
|
Since version 0.7.2, gocryptfs is as fast as EncFS in the default mode,
|
|
and significantly faster than EncFS' "paranoia" mode that provides
|
|
a security level comparable to gocryptfs.
|
|
|
|
gocryptfs uses OpenSSL through a thin wrapper called `stupidgcm`.
|
|
This provides a 4x speedup compared to Go's builtin AES-GCM
|
|
implementation - see [openssl-gcm.md](Documentation/openssl-gcm.md)
|
|
for details. The use of openssl can disabled on the command-line.
|
|
|
|
Run `./benchmark.bash` to run gocryptfs' canonical set of
|
|
benchmarks that include streaming write, extracting a linux kernel
|
|
tarball, recursively listing and finally deleting it. The output will
|
|
look like this:
|
|
|
|
```
|
|
$ ./benchmark.bash
|
|
linux-3.0.tar.gz 100%[==========================>] 92,20M 2,96MB/s in 35s
|
|
2016-05-04 19:29:20 URL:https://www.kernel.org/pub/linux/kernel/v3.0/linux-3.0.tar.gz
|
|
WRITE: 131072000 bytes (131 MB) copied, 1,43137 s, 91,6 MB/s
|
|
UNTAR: 23.25
|
|
LS: 1.75
|
|
RM: 4.42
|
|
```
|
|
|
|
Changelog
|
|
---------
|
|
|
|
v1.3 (in progress)
|
|
* **Use HKDF to derive separate keys for GCM and EME**
|
|
* New feature flag: `HKDF` (enabled by default)
|
|
* This is a forwards-compatible change. gocryptfs v1.3 can mount
|
|
filesystems created by earlier versions but not the other way round.
|
|
* Enable Raw64 filename encoding by default (gets rid of trailing `==` characters)
|
|
* Drop Go 1.4 compatibility. You now need Go 1.5 (released 2015-08-19)
|
|
or higher to build gocryptfs.
|
|
* Add `-serialize_reads` command-line option
|
|
* This can greatly improve performance on storage
|
|
that is very slow for concurrent out-of-order reads. Example:
|
|
Amazon Cloud Drive ([#92](https://github.com/rfjakob/gocryptfs/issues/92))
|
|
* Reject file-header-only files
|
|
([#90 2.2](https://github.com/rfjakob/gocryptfs/issues/90),
|
|
[commit](https://github.com/rfjakob/gocryptfs/commit/14038a1644f17f50b113a05d09a2a0a3b3e973b2))
|
|
* Increase max password size to 2000 bytes ([#93](https://github.com/rfjakob/gocryptfs/issues/93))
|
|
|
|
v1.2.1, 2017-02-26
|
|
* Add an integrated speed test, `gocryptfs -speed`
|
|
* Limit password size to 1000 bytes and reject trailing garbage after the newline
|
|
* Make the test suite work on [Mac OS X](https://github.com/rfjakob/gocryptfs/issues/15)
|
|
* Handle additional corner cases in `-ctlsock` path sanitization
|
|
* Use dedicated exit code 12 on "password incorrect"
|
|
|
|
v1.2, 2016-12-04
|
|
* Add a control socket interface. Allows to encrypt and decrypt filenames.
|
|
For details see [backintime#644](https://github.com/bit-team/backintime/issues/644#issuecomment-259835183).
|
|
* New command-line option: `-ctlsock`
|
|
* Under certain circumstances, concurrent truncate and read could return
|
|
an I/O error. This is fixed by introducing a global open file table
|
|
that stores the file IDs
|
|
([commit](https://github.com/rfjakob/gocryptfs/commit/0489d08ae21107990d0efd0685443293aa26b35f)).
|
|
* Coalesce 4kB ciphertext block writes up to the size requested through
|
|
the write FUSE call
|
|
([commit with benchmarks](https://github.com/rfjakob/gocryptfs/commit/024511d9c71558be4b1169d6bb43bd18d65539e0))
|
|
* Add `-noprealloc` command-line option
|
|
* Greatly speeds up writes on Btrfs
|
|
([#63](https://github.com/rfjakob/gocryptfs/issues/63))
|
|
at the cost of reduced out-of-space robustness.
|
|
* This is a workaround for Btrfs' slow fallocate(2)
|
|
* Preserve owner for symlinks an device files (fixes bug [#64](https://github.com/rfjakob/gocryptfs/issues/64))
|
|
* Include rendered man page `gocryptfs.1` in the release tarball
|
|
|
|
v1.1.1, 2016-10-30
|
|
* Fix a panic on setting file timestamps ([go-fuse#131](https://github.com/hanwen/go-fuse/pull/131))
|
|
* Work around an issue in tmpfs that caused a panic in xfstests generic/075
|
|
([gocryptfs#56](https://github.com/rfjakob/gocryptfs/issues/56))
|
|
* Optimize NFS streaming writes
|
|
([commit](https://github.com/rfjakob/gocryptfs/commit/a08d55f42d5b11e265a8617bee16babceebfd026))
|
|
|
|
v1.1, 2016-10-19
|
|
* **Add reverse mode ([#19](https://github.com/rfjakob/gocryptfs/issues/19))**
|
|
* AES-SIV (RFC5297) encryption to implement deterministic encryption
|
|
securely. Uses the excellent
|
|
[jacobsa/crypto](https://github.com/jacobsa/crypto) library.
|
|
The corresponding feature flag is called `AESSIV`.
|
|
* New command-line options: `-reverse`, `-aessiv`
|
|
* Filesystems using reverse mode can only be mounted with gocryptfs v1.1
|
|
and later.
|
|
* The default, forward mode, stays fully compatible with older versions.
|
|
Forward mode will keep using GCM because it is much faster.
|
|
* Accept `-o foo,bar,baz`-style options that are passed at the end of
|
|
the command-line, like mount(1) does. All other options must still
|
|
precede the passed paths.
|
|
* This allows **mounting from /etc/fstab**. See
|
|
[#45](https://github.com/rfjakob/gocryptfs/issues/45) for details.
|
|
* **Mounting on login using pam_mount** works as well. It is
|
|
[described in the wiki](https://github.com/rfjakob/gocryptfs/wiki/Mounting-on-login-using-pam_mount).
|
|
* To prevent confusion, the old `-o` option had to be renamed. It is now
|
|
called `-ko`. Arguments to `-ko` are passed directly to the kernel.
|
|
* New `-passfile` command-line option. Provides an easier way to read
|
|
the password from a file. Internally, this is equivalent to
|
|
`-extpass "/bin/cat FILE"`.
|
|
* Enable changing the password when you only know the master key
|
|
([#28](https://github.com/rfjakob/gocryptfs/issues/28))
|
|
|
|
v1.0, 2016-07-17
|
|
* Deprecate very old filesystems, stage 3/3
|
|
* Filesystems created by v0.6 can no longer be mounted
|
|
* Drop command-line options `-gcmiv128`, `-emenames`, `-diriv`. These
|
|
are now always enabled.
|
|
* Add fallocate(2) support
|
|
* New command-line option `-o`
|
|
* Allows to pass mount options directly to the kernel
|
|
* Add support for device files and suid binaries
|
|
* Only works when running as root
|
|
* Must be explicitely enabled by passing "-o dev" or "-o suid" or "-o suid,dev"
|
|
* Experimental Mac OS X support. See
|
|
[ticket #15](https://github.com/rfjakob/gocryptfs/issues/15) for details.
|
|
|
|
v0.12, 2016-06-19
|
|
* Deprecate very old filesystems, stage 2/3
|
|
* Filesystems created by v0.6 and older can only be mounted read-only
|
|
* A [message](https://github.com/rfjakob/gocryptfs/blob/v0.12/internal/configfile/config_file.go#L120)
|
|
explaining the situation is printed as well
|
|
* New command line option: `-ro`
|
|
* Mounts the filesystem read-only
|
|
* Accept password from stdin as well ([ticket #30](https://github.com/rfjakob/gocryptfs/issues/30))
|
|
|
|
v0.11, 2016-06-10
|
|
* Deprecate very old filesystems, stage 1/3
|
|
* Filesystems created by v0.6 and older can still be mounted but a
|
|
[warning](https://github.com/rfjakob/gocryptfs/blob/v0.11/internal/configfile/config_file.go#L120)
|
|
is printed
|
|
* See [ticket #29](https://github.com/rfjakob/gocryptfs/issues/29) for details and
|
|
join the discussion
|
|
* Add rsync stress test "pingpong-rsync.bash"
|
|
* Fix chown and utimens failures that caused rsync to complain
|
|
* Build release binaries with Go 1.6.2
|
|
* Big speedup for CPUs with AES-NI, see [ticket #23](https://github.com/rfjakob/gocryptfs/issues/23)
|
|
|
|
v0.10, 2016-05-30
|
|
* **Replace `spacemonkeygo/openssl` with `stupidgcm`**
|
|
* gocryptfs now has its own thin wrapper to OpenSSL's GCM implementation
|
|
called `stupidgcm`.
|
|
* This should fix the [compile issues](https://github.com/rfjakob/gocryptfs/issues/21)
|
|
people are seeing with `spacemonkeygo/openssl`. It also gets us
|
|
a 20% performance boost for streaming writes.
|
|
* **Automatically choose between OpenSSL and Go crypto** [issue #23](https://github.com/rfjakob/gocryptfs/issues/23)
|
|
* Go 1.6 added an optimized GCM implementation in amd64 assembly that uses AES-NI.
|
|
This is faster than OpenSSL and is used if available. In all other
|
|
cases OpenSSL is much faster and is used instead.
|
|
* `-openssl=auto` is the new default
|
|
* Passing `-openssl=true/false` overrides the autodetection.
|
|
* Warn but continue anyway if fallocate(2) is not supported by the
|
|
underlying filesystem, see [issue #22](https://github.com/rfjakob/gocryptfs/issues/22)
|
|
* Enables to use gocryptfs on ZFS and ext3, albeit with reduced out-of-space safety.
|
|
* [Fix statfs](https://github.com/rfjakob/gocryptfs/pull/27), by @lxp
|
|
* Fix a fsstress [failure](https://github.com/hanwen/go-fuse/issues/106)
|
|
in the go-fuse library.
|
|
|
|
v0.9, 2016-04-10
|
|
* **Long file name support**
|
|
* gocryptfs now supports file names up to 255 characters.
|
|
* This is a forwards-compatible change. gocryptfs v0.9 can mount filesystems
|
|
created by earlier versions but not the other way round.
|
|
* Refactor gocryptfs into multiple "internal" packages
|
|
* New command-line options:
|
|
* `-longnames`: Enable long file name support (default true)
|
|
* `-nosyslog`: Print messages to stdout and stderr instead of syslog (default false)
|
|
* `-wpanic`: Make warning messages fatal (used for testing)
|
|
* `-d`: Alias for `-debug`
|
|
* `-q`: Alias for `-quiet`
|
|
|
|
v0.8, 2016-01-23
|
|
* Redirect output to syslog when running in the background
|
|
* New command-line option:
|
|
* `-memprofile`: Write a memory allocation debugging profile the specified
|
|
file
|
|
|
|
v0.7.2, 2016-01-19
|
|
* **Fix performance issue in small file creation**
|
|
* This brings performance on-par with EncFS paranoia mode, with streaming writes
|
|
significantly faster
|
|
* The actual [fix](https://github.com/hanwen/go-fuse/commit/c4b6b7949716d13eec856baffc7b7941ae21778c)
|
|
is in the go-fuse library. There are no code changes in gocryptfs.
|
|
|
|
v0.7.1, 2016-01-09
|
|
* Make the `build.bash` script compatible with Go 1.3
|
|
* Disable fallocate on OSX (system call not availabe)
|
|
* Introduce pre-built binaries for Fedora 23 and Debian 8
|
|
|
|
v0.7, 2015-12-20
|
|
* **Extend GCM IV size to 128 bit from Go's default of 96 bit**
|
|
* This pushes back the birthday bound to make IV collisions virtually
|
|
impossible
|
|
* This is a forwards-compatible change. gocryptfs v0.7 can mount filesystems
|
|
created by earlier versions but not the other way round.
|
|
* New command-line option:
|
|
* `-gcmiv128`: Use 128-bit GCM IVs (default true)
|
|
|
|
v0.6, 2015-12-08
|
|
* **Wide-block filename encryption using EME + DirIV**
|
|
* EME (ECB-Mix-ECB) provides even better security than CBC as it fixes
|
|
the prefix leak. The used Go EME implementation is
|
|
https://github.com/rfjakob/eme which is, as far as I know, the first
|
|
implementation of EME in Go.
|
|
* This is a forwards-compatible change. gocryptfs v0.6 can mount filesystems
|
|
created by earlier versions but not the other way round.
|
|
* New command-line option:
|
|
* `-emenames`: Enable EME filename encryption (default true)
|
|
|
|
v0.5.1, 2015-12-06
|
|
* Fix a rename regression caused by DirIV and add test case
|
|
* Use fallocate to guard against out-of-space errors
|
|
|
|
v0.5, 2015-12-04
|
|
* **Stronger filename encryption: DirIV**
|
|
* Each directory gets a random 128 bit file name IV on creation,
|
|
stored in `gocryptfs.diriv`
|
|
* This makes it impossible to identify identically-named files across
|
|
directories
|
|
* A single-entry IV cache brings the performance cost of DirIV close to
|
|
zero for common operations (see performance.txt)
|
|
* This is a forwards-compatible change. gocryptfs v0.5 can mount filesystems
|
|
created by earlier versions but not the other way round.
|
|
* New command-line option:
|
|
* `-diriv`: Use the new per-directory IV file name encryption (default true)
|
|
* `-scryptn`: allows to set the scrypt cost parameter N. This option
|
|
can be used for faster mounting at the cost of lower brute-force
|
|
resistance. It was mainly added to speed up the automated tests.
|
|
|
|
v0.4, 2015-11-15
|
|
* New command-line options:
|
|
* `-plaintextnames`: disables filename encryption, added on user request
|
|
* `-extpass`: calls an external program for prompting for the password
|
|
* `-config`: allows to specify a custom gocryptfs.conf path
|
|
* Add `FeatureFlags` gocryptfs.conf paramter
|
|
* This is a config format change, hence the on-disk format is incremented
|
|
* Used for ext4-style filesystem feature flags. This should help avoid future
|
|
format changes. The first user is `-plaintextnames`.
|
|
* On-disk format 2
|
|
|
|
v0.3, 2015-11-01
|
|
* **Add a random 128 bit file header to authenticate file->block ownership**
|
|
* This is an on-disk-format change
|
|
* On-disk format 1
|
|
|
|
v0.2, 2015-10-11
|
|
* Replace bash daemonization wrapper with native Go implementation
|
|
* Better user feedback on mount failures
|
|
|
|
v0.1, 2015-10-07
|
|
* First release
|
|
* On-disk format 0
|