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Re-design of the original gocryptfs code to work as a library.
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Jakob Unterwurzacher 3e367b29b0 config: Introduce ext4-style feature flags 
// 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
 		2015-11-03 21:05:47 +01:00
cryptfs config: Introduce ext4-style feature flags 2015-11-03 21:05:47 +01:00
openssl_benchmark Run go fmt 2015-10-07 22:59:36 +02:00
pathfs_frontend Implement PlainTextNames mode 2015-11-03 00:00:13 +01:00
.gitignore Move main files to top level dir 2015-10-11 17:14:18 +02:00
.travis.yml Add travis config file 2015-10-11 23:55:47 +02:00
LICENSE Add MIT LICENSE 2015-10-11 23:15:03 +02:00
README.md Update README with v0.4 2015-11-03 00:08:31 +01:00
SECURITY.md Add file header (on-disk-format change) 2015-11-01 01:38:27 +01:00
USAGE.txt Update USAGE.txt 2015-11-03 00:06:04 +01:00
XFSTESTS.md Fix link in XFSTESTS.md 2015-10-11 23:18:02 +02:00
benchmark.bash Fix helper scripts for new top-level path 2015-10-11 18:40:27 +02:00
build.bash Bake version string into binary, add "--version" switch 2015-11-01 14:04:29 +01:00
checkdir.go Fix missing printf arguments discovered by "go vet" 2015-11-01 11:56:33 +01:00
daemonize.go Fix missing printf arguments discovered by "go vet" 2015-11-01 11:56:33 +01:00
main.go config: Introduce ext4-style feature flags 2015-11-03 21:05:47 +01:00
main_test.go Refactor ciphertext <-> plaintext offset translation functions 2015-11-01 12:11:36 +01:00
masterkey.go Move main files to top level dir 2015-10-11 17:14:18 +02:00
package.bash package.bash: add architecture to filename 2015-11-01 15:33:54 +01:00
password.go Move main files to top level dir 2015-10-11 17:14:18 +02:00
sendusr1.go Fix three "golint" nitpicks 2015-11-02 22:51:12 +01:00
test.bash Update test.bash to call build.bash 2015-11-01 15:22:53 +01:00

README.md

GoCryptFS Build Status

An encrypted overlay filesystem written in Go.

gocryptfs is built on top the excellent go-fuse FUSE library and its LoopbackFileSystem API.

This project was inspired by EncFS and strives to fix its security issues (see EncFS tickets 9, 13, 14, 16). For details on the security of gocryptfs see the SECURITY.md document.

Current Status

  • Feature-complete and working
  • Passes the fuse-xfstests "generic" tests with one exception, results: XFSTESTS.md
  • A lot of work has gone into this. The testing has found bugs in gocryptfs as well as in go-fuse.
  • The one exception is generic/035. This is a limitation in go-fuse, check out https://github.com/hanwen/go-fuse/issues/55 for details.
  • However, gocryptfs needs more real-world testing - please report any issues via github.
  • Only Linux operation has been tested. Help wanted for Mac OS X verification.

Install

$ go get github.com/rfjakob/gocryptfs

Use

$ mkdir cipher plain
$ $GOPATH/bin/gocryptfs --init cipher
  [...]
$ $GOPATH/bin/gocryptfs cipher plain
  [...]
$ echo test > plain/test.txt
$ ls -l cipher
  total 8
  -rw-rw-r--. 1 user  user   33  7. Okt 23:23 0ao8Hyyf1A-A88sfNvkUxA==
  -rw-rw-r--. 1 user  user  233  7. Okt 23:23 gocryptfs.conf
$ fusermount -u plain

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)
  • 28 bytes of storage overhead per 4kB block (12 byte nonce, 16 bytes auth tag)

Performance

Run ./benchmark.bash to run the test suite and the streaming read/write benchmark. The benchmark is run twice, first with native Go crypto and second using openssl.

The output should look like this:

$ ./benchmark.bash
[...]
BenchmarkStreamWrite	     100	  11816665 ns/op	  88.74 MB/s
BenchmarkStreamRead 	     200	   7848155 ns/op	 133.61 MB/s
ok  	github.com/rfjakob/gocryptfs	9.407s

Changelog

v0.4 (in progress)

  • Add "--plaintextnames option"
  • This adds the PlainTextNames parameter to the config file, hence format++
  • On-disk format 2

v0.3

  • Add file header that contains a random id to authenticate blocks
  • This is an on-disk-format change
  • On-disk format 1

v0.2

  • Replace bash daemonization wrapper with native Go implementation
  • Better user feedback on mount failures

v0.1

  • First release
  • On-disk format 0

See https://github.com/rfjakob/gocryptfs/releases for the release dates and associated tags.