hardcoresushi/libgocryptfs
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Author SHA1 Message Date
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
Jakob Unterwurzacher
5f726aaa9d contentenc: add GCM-SIV support 
Also add ReverseDummyNonce nonce generation.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
90f0bdc224 main: init: refuse overwriting .gocryptfs.reverse.conf 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
7f87ed78f2 cryptocore: add support for GCM-SIV 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
d1762c5b95 reverse: fix GetAttr for gocryptfs.conf 
And also don't return the encrypted version of
.gocryptfs.reverse.conf in readdir.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
5fb6c5cf58 reverse: enable init functionality 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
72efa5c9b1 main: move initDir into its own file 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
9ad49088fa main: add explicit exit after forkChild 
Trying to make it more obvious what is happening.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
d9db75ebd2 main: factor out cli arg parsing 
The main function has gotten way too big.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
3d59c7dd6a reverse: add gocryptfs.conf passthrough 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
1932248446 reverse: get rid of debug message 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
ce22ab36e1 reverse: gocryptfs.diriv content was generated from wrong path 
Should be derived from the directory name only.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
7faa267bd4 reverse: rename readFile to clearer readBackingFile 
Also refactor the header generation for nicer code.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
be9dfe3a89 reverse: implement dynamic diriv 
Introduce a unique per-directory diriv that is generated
by hashing the encrypted directory path.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
10f38e8870 reverse: generate file header for Read() 
Also create virtual gocryptfs.diriv entries (no content yet).
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
ac1221395e nametransform: export DirIVLen constant 
Will be needed by reverse mode.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
e42ab3908d reverse: print value in file offset panic 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
a34b447ad1 reverse: let the kernel enforce read-only mode 
... and print a warning that reverse mode is experimental
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
777eb8e62f reverse: rename types to reverseXYZ 
...to prevent confusion with the forward variants.

FS   -> reverseFS
file -> reverseFile

Also add an incomplete read implementation.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
5931eea387 contentenc: add helpers for reverse mode 
Add the reverse variant of DecryptBlocks etc:

* EncryptBlocks
* JointPlaintextRange
* ExplodeCipherRange
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
1d4c6288f2 main: initial support for reverse mode 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
1d62086742 conentenc: handle zero-sized files in PlainSizeToCipherSize 
Previously caused an integer underflow.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
9237b4f53e reverse: add skeleton 
Compiles but does not do much else.
 2016-09-25 16:43:17 +02:00
Jakob Unterwurzacher
f6d4d240e6 tests: skip the nanosecond compare for now 2016-09-25 16:42:29 +02:00
Jakob Unterwurzacher
fca1b82417 fusefrontend: relay Utimens to go-fuse 
Commit af5441dcd9 has caused a
regression ( https://github.com/rfjakob/gocryptfs/issues/35 )
that is fixed by this commit.

The go-fuse library by now has all the syscall wrappers in
place to correctly handle Utimens, also for symlinks.

Instead of duplicating the effort here just call into go-fuse.

Closes #35
 2016-09-25 16:30:29 +02:00
Jakob Unterwurzacher
8f1e51789d tests: set the times on a symlink 
This currently fails as reported in
https://github.com/rfjakob/gocryptfs/issues/35 .

Also remove the spurious sleep in the test.
 2016-09-25 16:17:26 +02:00
Jakob Unterwurzacher
af5441dcd9 fusefrontend: use NsecToTimespec() for Utimens 
This fixes a build problem on 32-bit hosts:

  internal/fusefrontend/file.go:400: cannot use a.Unix() (type int64) as
  type int32 in assignment
  internal/fusefrontend/file.go:406: cannot use m.Unix() (type int64) as
  type int32 in assignment

It also enables full nanosecond timestamps for dates
after 1970.
 2016-08-09 22:18:46 +02:00
Jakob Unterwurzacher
fc0de96763 tests: add TestUtimesNano 
Make sure setting nanoseconds works by path and fd.
 2016-08-09 22:10:25 +02:00
Jakob Unterwurzacher
7395b8e990 cryptocore: comment why 96-bit IVs are still supported 2016-07-31 13:36:38 +02:00
Jakob Unterwurzacher
02aab5d21f Drop obsolete .drone.yml 
Drone CI may make sense in the future when I set up a private
instance that supports FUSE, but for now it provides no advantages
to Travis CI.
 2016-07-21 21:33:10 +02:00
Jakob Unterwurzacher
2e519b9609 Update README for v1.0 2016-07-17 12:19:50 +02:00
Jakob Unterwurzacher
0a3225b1eb tests: add RSS tracking to extractloop 
This obsoletes loopback-mem.bash.
 2016-07-16 21:20:54 +02:00
Jakob Unterwurzacher
6b50f2debc tests: factor out fs-agnostic benchmark script 
"canonical-benchmarks.bash TESTDIR"
can now be used on any filesystem.
 2016-07-16 18:08:01 +02:00
Jakob Unterwurzacher
d3940c6263 tests: add maxlen.bash helper 
Simple script that finds out the maximum supported filename
length.
 2016-07-16 14:10:17 +02:00
Jakob Unterwurzacher
e98c51afd6 tests: add loopback-mem script 
Helps to find memory leaks in go-fuse's loopback, which
gocryptfs builds upon.
 2016-07-14 09:26:00 +02:00
Jakob Unterwurzacher
09c16ed2a7 tests: extractloop: add loopback support 
loopback is an example app that comes with the go-fuse lib.
It uses all the same APIs as gocryptfs, minus the encryption.
 2016-07-12 08:30:29 +02:00
Jakob Unterwurzacher
cf742f4e8b tests: add encfs support to benchmark.bash and extractloop.bash 
Pass "-encfs" to test encfs instead of gocryptfs.
 2016-07-11 22:10:41 +02:00
Jakob Unterwurzacher
63def5df5d tests: matrix: print name in verbose output 2016-07-11 21:42:40 +02:00
Jakob Unterwurzacher
df17f1d702 tests: add verbose output when unmounting 2016-07-11 20:41:53 +02:00
Jakob Unterwurzacher
1c54fcd04b tests: use unmount wrapper in ResetTmpDir 
This should make it work on OSX.

Also, split unmount into two functions. Depending on what you
want,

* UnmountErr returns the resulting error
* UnmountPanic panics if the error was not nil
 2016-07-11 20:41:16 +02:00
rfjakob
621cbad5e1 README: Fix ticket #15 copy-paste errors 
Thanks to @spaghetti2514 for noticing.
 2016-07-10 12:16:55 +02:00