1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
[](https://nuetzlich.net/gocryptfs/) [](https://travis-ci.org/rfjakob/gocryptfs) 
==============
An encrypted overlay filesystem written in Go.
Official website: https://nuetzlich.net/gocryptfs
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 is a young project. While bugs in any software can cause issues,
bugs in encryption software can cause catastrophic data loss. Keep a backup
of your gocryptfs filesystem *and* store a copy of your master key (printed
on mount) in a safe place. See below for how gocryptfs is tested.
Only Linux is supported at the moment. [Help wanted for a Mac OS X port.](https://github.com/rfjakob/gocryptfs/issues/15)
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 github.com/rfjakob/gocryptfs
Use
---
$ mkdir cipher plain
$ $GOPATH/bin/gocryptfs -init cipher
$ $GOPATH/bin/gocryptfs cipher plain
See the [Quickstart](https://nuetzlich.net/gocryptfs/quickstart/) page for more info.
The [MANPAGE.md](Documentation/MANPAGE.md) containes a description of available command-line options.
If you already have gocryptfs installed, run `./MANPAGE-render.bash` to bring up the rendered manpage in
your man pager (requires pandoc).
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)
[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
---------
v0.11, 2016-06-07
* Deprecate filesystems created by v0.6 and older
* Filesystems can still be mounted but a warning is printed
* See 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 [#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
|
