hardcoresushi/libgocryptfs
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Author SHA1 Message Date
Jakob Unterwurzacher
9b1a35174b MANPAGE: note that "-f" implies "-nosyslog" 
Also explain why AES-SIV exists.
 2016-10-07 23:02:04 +02:00
Jakob Unterwurzacher
14fd5ce598 main: daemonize more thoroughly 
As described at http://software.clapper.org/daemonize/ ,
a daemon should chdir to / and close its FDs.
 2016-10-07 22:44:28 +02:00
Jakob Unterwurzacher
53257f4ee5 nametransform: better error code on invalid diriv length 
go-fuse translates errors unknown to it into "function not
implemented", which is wrong in this case.
 2016-10-07 22:40:30 +02:00
Jakob Unterwurzacher
45dfc90a2f main: clarify nosyslog code path 
Split the block up and add a comment why notifypid is important.
 2016-10-07 00:05:46 +02:00
Jakob Unterwurzacher
434ce50db3 main: add "-nonempty" option 2016-10-06 22:41:13 +02:00
Jakob Unterwurzacher
ff48dc1aab reverse: initialize the longname cache only when reverse mode is used 
Gets rid of the idling longnameCacheCleaner thread in "normal" mode.
 2016-10-05 22:22:28 +02:00
Jakob Unterwurzacher
a4956fa6bf A few more lint fixes 2016-10-04 23:30:05 +02:00
Valient Gough
b764917cd5 lint fixes 2016-10-04 23:18:33 +02:00
Jakob Unterwurzacher
31a8f8b839 tests: skip "go tool vet" if the command is not available 
"vet" is not availably by default on Go 1.4.
 2016-10-04 22:42:30 +02:00
Jakob Unterwurzacher
49c73f84f5 tests: drop Go 1.3.3 from Travis testing 
Does not support testing.M, which means we cannot run the
test suite, which means we cannot claim to support it at
all.
 2016-10-04 22:34:13 +02:00
Jakob Unterwurzacher
db5782028a tests: skip tests with -openssl=false on Go 1.4 and lower 
Go versions 1.4 and lower lack NewGCMWithNonceSize(), which causes
a panic in the test.
 2016-10-04 22:34:12 +02:00
Jakob Unterwurzacher
b80d01056f tests: enable FUSE tests on Travis CI 2016-10-04 22:34:07 +02:00
Jakob Unterwurzacher
67a959eebf tests: symlink to "/" instead of "/etc/motd" 
This file does not exist on all systems, causing spurious
test failures.

See #40, #43
 2016-10-04 22:01:47 +02:00
Jakob Unterwurzacher
95db38912b tests: fallocate: skip some disk usage checks on btrfs 
The expected allocated sizes are verified for tmpfs and ext4.
btrfs gives different results, but that's not an error.

Also, simplify test_helpers.Du and several code paths.

Fixes #43.
 2016-10-04 21:57:13 +02:00
Romain
db72a4489d fusefrontend_reverse cast Stat_t.Dev to uint64 (#44) 
The [Stat_t.Dev](https://golang.org/pkg/syscall/#Stat_t) docs say `Dev` is a `unit64`, but on [macOS amd64](https://golang.org/src/syscall/ztypes_darwin_amd64.go) it's an `int32`.
 2016-10-04 15:03:47 +02:00
Jakob Unterwurzacher
b068ffbff9 maxlen.bash: result was 1 too high 
Additionally, output 0 instead of 7 on permission errors.
 2016-10-04 10:26:22 +02:00
Jakob Unterwurzacher
56c0b19612 without_openssl: support compiling completely without openssl 
Build helper script: build-without-openssl.bash
 2016-10-04 09:51:14 +02:00
Jakob Unterwurzacher
a00402cc47 cryptocore: rename "gcm" variable to generic "aeadCipher" 
As we now also support AES-SIV the old name is no longer
correct.
 2016-10-04 00:17:09 +02:00
Jakob Unterwurzacher
bb52937834 cryptocore: derive 512-bit key for AES-SIV 
AES-SIV uses 1/2 of the key for authentication, 1/2 for
encryption, so we need a 64-byte key for AES-256. Derive
it from the master key by hashing it with SHA-512.
 2016-10-04 00:16:56 +02:00
Jakob Unterwurzacher
46018785b4 siv_aead: Overhead is always 16 
Add a test for that.

Also test operations using a 64-byte key.
 2016-10-03 23:58:19 +02:00
Jakob Unterwurzacher
b7be386e46 xray: print block offsets 2016-09-29 22:13:26 +02:00
Jakob Unterwurzacher
a2510efe12 reverse: use per-purpose nonce generation 
Also pull all the deterministic nonce code into fusefrontend_reverse
to greatly simplify the normal code path.
 2016-09-29 21:56:49 +02:00
Jakob Unterwurzacher
bce96b5095 reverse: move newDirIVFile into virtualfile.go 
After all, is's a virtual file.
 2016-09-28 23:30:13 +02:00
Jakob Unterwurzacher
35fb6583e6 main: get rid of duplicate "extpass" message 
$ gocryptfs -init -extpass "echo test" a
Using password provided via -extpass.   <<< DUPLICATE
Reading password from extpass program
The gocryptfs filesystem has been created successfully.
You can now mount it using: gocryptfs a MOUNTPOINT
 2016-09-28 20:47:01 +02:00
Jakob Unterwurzacher
4b934f1a72 README: storage overhead is 32 bytes 
As stated in file-format.md.
 2016-09-26 23:46:37 +02:00
Jakob Unterwurzacher
e9bb8b800c reverse: switch from GCM-SIV to AES-SIV 
GCM-SIV is not yet finalized, and the reference implemenation is
painfully slow at about 2 MB/s. Switch to AES-SIV.
 2016-09-26 23:25:13 +02:00
Jakob Unterwurzacher
d9fc652df0 siv_aead: add AES-SIV AEAD wrapper 2016-09-26 23:06:40 +02:00
Jakob Unterwurzacher
0e277ba19e stupidgcm: add GCM-SIV benchmark 
On a CPU without AES-NI:

$ go test -bench .
Benchmark4kEncStupidGCM-2   	   50000	     24155 ns/op	 169.57 MB/s
Benchmark4kEncGoGCM-2       	   20000	     93965 ns/op	  43.59 MB/s
Benchmark4kEncGCMSIV-2      	     500	   2576193 ns/op	   1.59 MB/s
 2016-09-25 20:04:55 +02:00
Jakob Unterwurzacher
32e35adcad tests: add reverse linux tarball test 2016-09-25 20:04:03 +02:00
Jakob Unterwurzacher
28838a489d nametransform: downgrade invalid length warning 
This happens all the time in reverse mode when somebody stats
an encrypted symlink target.
 2016-09-25 19:50:16 +02:00
Jakob Unterwurzacher
5f4b16c00f Implement changes proposed by gosimple. 
Also delete the unused "dirIVNameStruct", found by deadcode.
 2016-09-25 19:48:21 +02:00
Jakob Unterwurzacher
166ba74a05 tests: enable all go vet checks 
...and fix reported errors:

internal/fusefrontend_reverse/rfile.go:40: github.com/rfjakob/gocryptfs/internal/contentenc.FileHeader composite literal uses unkeyed fields
internal/fusefrontend_reverse/rfs.go:249: github.com/hanwen/go-fuse/fuse.DirEntry composite literal uses unkeyed fields
internal/fusefrontend_reverse/rfs.go:264: github.com/hanwen/go-fuse/fuse.DirEntry composite literal uses unkeyed fields
 2016-09-25 19:02:12 +02:00
Jakob Unterwurzacher
c7b3150afc nametransform: delete unused function DecryptPathDirIV 2016-09-25 18:56:23 +02:00
Jakob Unterwurzacher
abd61d968d contentenc: rename constant "IVBitLen" to "DefaultIVBits" and clarify comment 
128-bit IVs are NOT used everywhere.
 2016-09-25 18:40:29 +02:00
Jakob Unterwurzacher
b883dd10a6 reverse: add symlink encryption and Readlink support 2016-09-25 18:01:24 +02:00
Jakob Unterwurzacher
12808138ef contentenc: add "ExternalNonce" mode 
This will be used for strong symlink encryption in reverse mode.
 2016-09-25 17:44:19 +02:00
Jakob Unterwurzacher
32e55261ca fusefrontend: handle Readlink directly 
Calling into go-fuse's loopbackFileSystem does not add
any value here.
 2016-09-25 17:01:39 +02:00
Jakob Unterwurzacher
ffdb7cd47a reverse: more thorough longname stat test 
Now also verifies the returned file size.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
2050c7f3b3 reverse: add gcmsiv flag and associated tests 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
f8da264222 tests: smarter error handling in ResetTmpDir 
Look at the error code from os.Remove and decide about the
right thing to do.

Gets rid of spurious fusermount error messages.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
7bbf6ad6ea reverse: derive file ID and block IVs from file paths 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
3a9bd92754 xray: add "gocryptfs-xray", on-disk-format exploration tool 
Example output for a file encrypted in reverse mode:

Header: Version: 2, Id: 0b7f5e2574e4afa859a9bb156a2e7772
Block  0: IV: 0b7f5e2574e4afa859a9bb156a2e7773, Tag: bf39279ac6b1ccd852567aaf26ee386b, Len: 4128
Block  1: IV: 0b7f5e2574e4afa859a9bb156a2e7774, Tag: a4f0f9cde7f70a752254aa8fe7718699, Len: 4128
Block  2: IV: 0b7f5e2574e4afa859a9bb156a2e7775, Tag: b467b153016fc1d531818b65ab9e24f6, Len: 4128
Block  3: IV: 0b7f5e2574e4afa859a9bb156a2e7776, Tag: 1fcb7ffd8f1816fbe807df8148718a5c, Len: 4128
Block  4: IV: 0b7f5e2574e4afa859a9bb156a2e7777, Tag: a217e7933ef434c9f03ad931bb5fde9b, Len: 4128
Block  5: IV: 0b7f5e2574e4afa859a9bb156a2e7778, Tag: f3e6240d75cd66371a0b301111d6f1fc, Len: 4128
Block  6: IV: 0b7f5e2574e4afa859a9bb156a2e7779, Tag: bc85d322ebc7761ae5ef114ea3903a56, Len: 4128
Block  7: IV: 0b7f5e2574e4afa859a9bb156a2e777a, Tag: efda01c6b794690f939a12d6d49ac3af, Len: 4128
Block  8: IV: 0b7f5e2574e4afa859a9bb156a2e777b, Tag: b198329d489d1392080f710206932ff0, Len: 2907
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
6c52c1a6e6 reverse: add longname benchmark 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
52a6f4f71e reverse: add longnameParentCache 
findLongnameParent has to read the whole directory to find the
right file; add a simple cache to avoid most directory scans.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
6ffd07f02a tests: extractloop: use tmp dir based on script name 
This is how this should be done as well in future test scripts.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
a6a7b424f8 reverse: resolve long names in Open and GetAttr 
The last patch added functionality for generating gocryptfs.longname.*
files, this patch adds support for mapping them back to the full
filenames.

Note that resolving a long name needs a full readdir. A cache
will be implemented later on to improve performance.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
35bcc2dca2 reverse: transform long names in OpenDir 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
b34a665da4 nametransform: implement ReadDirIV without Openat 
As ReadDirIV operates on a path anyway, opening the directory
has no clear safety advantage w.r.t. concurrent renames.

If the backing directory is a reverse-mounted gocryptfs filesystem,
each directory open is an OPENDIR, and this causes a full directory
read!

This patch improves the "ls -lR" performance of an

  DIR --> gocryptfs-reverse --> gocryptfs

chain by a factor of ~10.

OPENDIR counts for ls -lR:
  Before 15570
  After   2745
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
01c18dbcab nametransform: return EINVAL on invalid padding 
With the generic fmt.Errorf we trigger a warning from go-fuse:

  2016/09/21 21:42:31 can't convert error type: Invalid padding
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
d76e7aadb4 reverse: use dynamic inode numbers 
...with stable mappings for hard-linked files.
 2016-09-25 16:43:17 +02:00