Re-design of the original gocryptfs code to work as a library.
Go to file
Jakob Unterwurzacher 79b36dd8eb Add TODO file
2015-11-09 22:06:35 +01:00
cryptfs Centralize path filter decision in CryptFS.IsFiltered() 2015-11-03 22:25:29 +01:00
openssl_benchmark Run go fmt 2015-10-07 22:59:36 +02:00
pathfs_frontend Handle ENOSPC errors better by preallocating the space before writing 2015-11-08 22:36:29 +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
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
LICENSE Add MIT LICENSE 2015-10-11 23:15:03 +02:00
main_test.go tests: check that the filename encryption is working as expected 2015-11-03 22:27:11 +01:00
main.go tests: check that the filename encryption is working as expected 2015-11-03 22:27:11 +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
README.md README: List config format change 2015-11-03 22:34:16 +01:00
SECURITY.md Add file header (on-disk-format change) 2015-11-01 01:38:27 +01:00
sendusr1.go Fix three "golint" nitpicks 2015-11-02 22:51:12 +01:00
test.bash tests: reduce noise but make test.bash accept "-v" 2015-11-03 21:11:07 +01:00
TODO.md Add TODO file 2015-11-09 22:06:35 +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

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 command line option
  • Can only be used in conjunction with --init and disables filename encryption (added on user request)
  • Add FeatureFlags config file 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.
  • 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.