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499 Commits

Author SHA1 Message Date
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
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