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2016-09-25nametransform: downgrade invalid length warningJakob Unterwurzacher
This happens all the time in reverse mode when somebody stats an encrypted symlink target.
2016-09-25Implement changes proposed by gosimple.Jakob Unterwurzacher
Also delete the unused "dirIVNameStruct", found by deadcode.
2016-09-25tests: enable all go vet checksJakob Unterwurzacher
...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
2016-09-25nametransform: delete unused function DecryptPathDirIVJakob Unterwurzacher
2016-09-25contentenc: rename constant "IVBitLen" to "DefaultIVBits" and clarify commentJakob Unterwurzacher
128-bit IVs are NOT used everywhere.
2016-09-25reverse: add symlink encryption and Readlink supportJakob Unterwurzacher
2016-09-25contentenc: add "ExternalNonce" modeJakob Unterwurzacher
This will be used for strong symlink encryption in reverse mode.
2016-09-25fusefrontend: handle Readlink directlyJakob Unterwurzacher
Calling into go-fuse's loopbackFileSystem does not add any value here.
2016-09-25reverse: add gcmsiv flag and associated testsJakob Unterwurzacher
2016-09-25reverse: derive file ID and block IVs from file pathsJakob Unterwurzacher
2016-09-25reverse: add longnameParentCacheJakob Unterwurzacher
findLongnameParent has to read the whole directory to find the right file; add a simple cache to avoid most directory scans.
2016-09-25reverse: resolve long names in Open and GetAttrJakob Unterwurzacher
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.
2016-09-25reverse: transform long names in OpenDirJakob Unterwurzacher
2016-09-25nametransform: implement ReadDirIV without OpenatJakob Unterwurzacher
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
2016-09-25nametransform: return EINVAL on invalid paddingJakob Unterwurzacher
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
2016-09-25reverse: use dynamic inode numbersJakob Unterwurzacher
...with stable mappings for hard-linked files.
2016-09-25contentenc: add GCM-SIV supportJakob Unterwurzacher
Also add ReverseDummyNonce nonce generation.
2016-09-25cryptocore: add support for GCM-SIVJakob Unterwurzacher
2016-09-25reverse: fix GetAttr for gocryptfs.confJakob Unterwurzacher
And also don't return the encrypted version of .gocryptfs.reverse.conf in readdir.
2016-09-25reverse: add gocryptfs.conf passthroughJakob Unterwurzacher
2016-09-25reverse: get rid of debug messageJakob Unterwurzacher
2016-09-25reverse: gocryptfs.diriv content was generated from wrong pathJakob Unterwurzacher
Should be derived from the directory name only.
2016-09-25reverse: rename readFile to clearer readBackingFileJakob Unterwurzacher
Also refactor the header generation for nicer code.
2016-09-25reverse: implement dynamic dirivJakob Unterwurzacher
Introduce a unique per-directory diriv that is generated by hashing the encrypted directory path.
2016-09-25reverse: generate file header for Read()Jakob Unterwurzacher
Also create virtual gocryptfs.diriv entries (no content yet).
2016-09-25nametransform: export DirIVLen constantJakob Unterwurzacher
Will be needed by reverse mode.
2016-09-25reverse: print value in file offset panicJakob Unterwurzacher
2016-09-25reverse: rename types to reverseXYZJakob Unterwurzacher
...to prevent confusion with the forward variants. FS -> reverseFS file -> reverseFile Also add an incomplete read implementation.
2016-09-25contentenc: add helpers for reverse modeJakob Unterwurzacher
Add the reverse variant of DecryptBlocks etc: * EncryptBlocks * JointPlaintextRange * ExplodeCipherRange
2016-09-25main: initial support for reverse modeJakob Unterwurzacher
2016-09-25conentenc: handle zero-sized files in PlainSizeToCipherSizeJakob Unterwurzacher
Previously caused an integer underflow.
2016-09-25reverse: add skeletonJakob Unterwurzacher
Compiles but does not do much else.
2016-09-25fusefrontend: relay Utimens to go-fuseJakob Unterwurzacher
Commit af5441dcd9033e81da43ab77887a7b5aac693ab6 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
2016-08-09fusefrontend: use NsecToTimespec() for UtimensJakob Unterwurzacher
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.
2016-07-31cryptocore: comment why 96-bit IVs are still supportedJakob Unterwurzacher
2016-07-06Add godoc comments to all internal packagesJakob Unterwurzacher
2016-07-04prefer_openssl: OSX: get rid of /proc warningsJakob Unterwurzacher
OSX does not have /proc/cpuinfo, but let's not warn the user about it.
2016-07-04stupidgcm: use __builtin_trap()Jakob Unterwurzacher
[...]/stupidgcm/locking.go:16:2: warning: indirection of non-volatile null pointer will be deleted, not trap [-Wnull-dereference] [...]/stupidgcm/locking.go:16:2: note: consider using __builtin_trap() or qualifying pointer with 'volatile' https://github.com/rfjakob/gocryptfs/issues/15
2016-07-03syscallcompat: OSX: add Mknodat wrapperJakob Unterwurzacher
Protip: find naked *at syscalls using: git grep "syscall." | grep "at(" | grep -v syscallcompat
2016-07-03syscallcompat: OSX: add Unlinkat wrapperJakob Unterwurzacher
Also, replace remaining naked syscall.Openat calls.
2016-07-03fusefrontend: downgrade Renameat log message to debugJakob Unterwurzacher
2016-07-03syscallcompat: OSX: add Renamat wrapperJakob Unterwurzacher
Adds a poor man's renameat implementation for OSX.
2016-07-03syscallcompat: OSX: add Fallocate and Openat wrappersJakob Unterwurzacher
...and convert all calls to syscall.{Fallocate,Openat} to syscallcompat . Both syscalls are not available on OSX. We emulate Openat and just return EOPNOTSUPP for Fallocate.
2016-07-03syscallcompat: move syscall wrapper to their own packageJakob Unterwurzacher
We will get more of them as OSX also lacks support for openat.
2016-07-03nametransform: hide detailed padding error behind the debug flagJakob Unterwurzacher
unPad16 returns detailed errors including the position of the incorrect bytes. Kill a possible padding oracle by lumping everything into a generic error. The detailed error is only logged if debug is active.
2016-07-02fusefrontend: add fallocate supportJakob Unterwurzacher
Mode=0 (default) and mode=1 (keep size) are supported. The patch includes test cases and the whole thing passed xfstests. Fixes https://github.com/rfjakob/gocryptfs/issues/1 .
2016-07-02fusefronted: move Truncate() and Allocate() to their own fileJakob Unterwurzacher
These are large complicated implementations that will share some code.
2016-07-02contentenc: rename PlaintextRange and CiphertextRangeJakob Unterwurzacher
The name could be misunderstood and actually caused a bug: doWrite used to always preallocate 4128 instead of the actual data length.
2016-07-01fusefrontend: coalesce grows in Truncate()Jakob Unterwurzacher
We were growing the file block-by-block which was pretty inefficient. We now coalesce all the grows into a single Ftruncate. Also simplifies the code! Simplistic benchmark: Before: $ time truncate -s 1000M foo real 0m0.568s After: $ time truncate -s 1000M foo real 0m0.205s
2016-07-01fusefrontend: better comments for TruncateJakob Unterwurzacher
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