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2017-06-29contentenc: add safer "bPool" pool variant; add pBlockPoolJakob Unterwurzacher
bPool verifies the lengths of slices going in and out. Also, add a plaintext block pool - pBlockPool - and use it for decryption.
2017-06-29stupidgcm: use "dst" as the output buffer it is big enoughJakob Unterwurzacher
This saves an allocation of the ciphertext block.
2017-06-20contentenc: use sync.Pool memory pools for encryptionJakob Unterwurzacher
We use two levels of buffers: 1) 4kiB+overhead for each ciphertext block 2) 128kiB+overhead for each FUSE write (32 ciphertext blocks) This commit adds a sync.Pool for both levels. The memory-efficiency for small writes could be improved, as we now always use a 128kiB buffer.
2017-06-18main, syscallcompat: use Dup3 instead of Dup2Jakob Unterwurzacher
Dup2 is not implemented on linux/arm64. Fixes https://github.com/rfjakob/gocryptfs/issues/121 . Also adds cross-compilation to CI.
2017-06-11contentenc: parallelize encryption for 128kiB writesJakob Unterwurzacher
128kiB = 32 x 4kiB pages is the maximum we get from the kernel. Splitting up smaller writes is probably not worth it. Parallelism is limited to two for now.
2017-06-11cryptocore: prefetch nonces in the backgroundJakob Unterwurzacher
Spawn a worker goroutine that reads the next 512-byte block while the current one is being drained. This should help reduce waiting times when /dev/urandom is very slow (like on Linux 3.16 kernels).
2017-06-09cryptocore: prefetch nonces in 512-byte blocksJakob Unterwurzacher
On my machine, reading 512-byte blocks from /dev/urandom (same via getentropy syscall) is a lot faster in terms of throughput: Blocksize Throughput 16 28.18 MB/s 512 83.75 MB/s For a single-threaded streaming write, this drops the CPU usage of nonceGenerator.Get to almost 1/3: flat flat% sum% cum cum% Before 0 0% 95.08% 0.35s 2.92% github.com/rfjakob/gocryptfs/internal/cryptocore.(*nonceGenerator).Get After 0.01s 0.092% 92.34% 0.13s 1.20% github.com/rfjakob/gocryptfs/internal/cryptocore.(*nonceGenerator).Get This change makes the nonce reading single-threaded, which may hurt massively-parallel writes.
2017-06-09Fix missing Owner coercion for already-open files (#117)Charles Duffy
2017-06-07cryptocore: remove lastNonce checkJakob Unterwurzacher
This check would need locking to be multithreading-safe. But as it is in the fastpath, just remove it. rand.Read() already guarantees that the value is random.
2017-06-07contentenc: move EncryptBlocks() loop into its own functionsJakob Unterwurzacher
This allows easy parallelization in the future.
2017-06-07Add "-trace" flag (record execution trace)Jakob Unterwurzacher
Uses the runtime/trace functionality. TODO: add to man page.
2017-06-01fusefrontend: write: consolidate and move encryption to contentencJakob Unterwurzacher
Collect all the plaintext and pass everything to contentenc in one call. This will allow easier parallization of the encryption. https://github.com/rfjakob/gocryptfs/issues/116
2017-06-01Fix two commentsJakob Unterwurzacher
One out-of-date and the other with a typo.
2017-06-01Implement force_owner option to display ownership as a specific user.Charles Duffy
2017-05-31pathiv: fix test failure on Go 1.6Jakob Unterwurzacher
Travis failed on Go 1.6.3 with this error: internal/pathiv/pathiv_test.go:20: no args in Error call This change should solve the problem and provides a better error message on (real) test failure.
2017-05-30pathiv: move block IV algorithm into this packageJakob Unterwurzacher
This was implemented in fusefrontend_reverse, but we need it in fusefrontend as well. Move the algorithm into pathiv.BlockIV().
2017-05-30pathiv: move derivedIVContainer into the packageJakob Unterwurzacher
...under the new name "FileIVs". This will also be used by forward mode.
2017-05-30fusefrontend_reverse: move pathiv to its own packageJakob Unterwurzacher
We will also need it in forward mode.
2017-05-27cryptocore: improve comments and add tests for hkdfDeriveJakob Unterwurzacher
These should make it easier to re-implement the key derivation that was enabled with the "HKDF" feature flag.
2017-05-25fusefrontend_reverse: store derived values for hard-linked filesJakob Unterwurzacher
With hard links, the path to a file is not unique. This means that the ciphertext data depends on the path that is used to access the files. Fix that by storing the derived values when we encounter a hard-linked file. This means that the first path wins.
2017-05-25nametransform: reject all-zero dirIVJakob Unterwurzacher
This should never happen in normal operation and is a sign of data corruption. Catch it early.
2017-05-25contenenc: reject all-zero file IDJakob Unterwurzacher
This should never happen in normal operation and is a sign of data corruption. Catch it early.
2017-05-25contentenc: better error reporting in ParseHeaderJakob Unterwurzacher
Log the message ourselves and return EINVAL. Before: gocryptfs[26962]: go-fuse: can't convert error type: ParseHeader: invalid version: got 0, want 2 After: gocryptfs[617]: ParseHeader: invalid version: want 2, got 0. Returning EINVAL.
2017-05-23nametransform: harden name decryption against invalid inputJakob Unterwurzacher
This fixes a few issues I have found reviewing the code: 1) Limit the amount of data ReadLongName() will read. Previously, you could send gocryptfs into out-of-memory by symlinking gocryptfs.diriv to /dev/zero. 2) Handle the empty input case in unPad16() by returning an error. Previously, it would panic with an out-of-bounds array read. It is unclear to me if this could actually be triggered. 3) Reject empty names after base64-decoding in DecryptName(). An empty name crashes emeCipher.Decrypt(). It is unclear to me if B64.DecodeString() can actually return a non-error empty result, but let's guard against it anyway.
2017-05-23main: downgrade panic log create failure from fatal error to warningJakob Unterwurzacher
Exiting with a fatal error just pushes users to use "-nosyslog", which is even worse than not having a paniclog.
2017-05-22nametransform: diriv cache: fall back to the grandparentJakob Unterwurzacher
When a user calls into a deep directory hierarchy, we often get a sequence like this from the kernel: LOOKUP a LOOKUP a/b LOOKUP a/b/c LOOKUP a/b/c/d The diriv cache was not effective for this pattern, because it was designed for this: LOOKUP a/a LOOKUP a/b LOOKUP a/c LOOKUP a/d By also using the cached entry of the grandparent we can avoid lots of diriv reads. This benchmark is against a large encrypted directory hosted on NFS: Before: $ time ls -R nfs-backed-mount > /dev/null real 1m35.976s user 0m0.248s sys 0m0.281s After: $ time ls -R nfs-backed-mount > /dev/null real 1m3.670s user 0m0.217s sys 0m0.403s
2017-05-14exitcodes: specific codes for failure to read or write gocryptfs.confJakob Unterwurzacher
New codes: * OpenConf = 23 * WriteConf = 24
2017-05-14exitcodes: add code 22 for "password is empty"Jakob Unterwurzacher
Empty passwords are not allowed. Let's give the error it's own exit code.
2017-05-14exitcodes: get rid of generic "Mount" exit codeJakob Unterwurzacher
Instead, create three new specific exit codes: * FuseNewServer = 19 * CtlSock = 20 * PanicLogCreate = 21
2017-05-07exitcodes: pull all exit code definitions into the packageJakob Unterwurzacher
This commit defines all exit codes in one place in the exitcodes package. Also, it adds a test to verify the exit code on incorrect password, which is what SiriKali cares about the most. Fixes https://github.com/rfjakob/gocryptfs/issues/77 .
2017-05-07fusefrontend: implement path decryption via ctlsockJakob Unterwurzacher
Closes https://github.com/rfjakob/gocryptfs/issues/84 .
2017-05-07nametranform, fusefrontend: better errors on invalid namesJakob Unterwurzacher
nametransform.DecryptName() now always returns syscall.EBADMSG if the name was invalid. fusefrontend.OpenDir error messages have been normalized.
2017-05-07Fix typos found by MisspellJakob Unterwurzacher
Misspell Finds commonly misspelled English words gocryptfs/internal/configfile/scrypt.go Line 41: warning: "paramter" is a misspelling of "parameter" (misspell) gocryptfs/internal/ctlsock/ctlsock_serve.go Line 1: warning: "implementes" is a misspelling of "implements" (misspell) gocryptfs/tests/test_helpers/helpers.go Line 27: warning: "compatability" is a misspelling of "compatibility" (misspell)
2017-05-03fusefrontend: log "too many open files" errorsJakob Unterwurzacher
This usually indicates that the open file limit for gocryptfs is too low. We should report this to the user.
2017-05-01openfiletable: rename WriteLock to ContentLockJakob Unterwurzacher
...and IDLock to HeaderLock. This matches what the locks actually protect.
2017-05-01fusefrontend: rely on nodefs.defaultFile for no-op functionsJakob Unterwurzacher
Now that we embed nodefs.NewDefaultFile(), we can drop our own no-ops.
2017-05-01contentenc: downgrade "interrupted write?" warning to debugJakob Unterwurzacher
This can happen during normal operation, and is harmless since 14038a1644f17f50b113a05d09a2a0a3b3e973b2 "fusefrontend: readFileID: reject files that consist only of a header" causes dormant header-only files to be rewritten on the next write.
2017-05-01fusefrontend: drop writeOnly flagJakob Unterwurzacher
We do not have to track the writeOnly status because the kernel will not forward read requests on a write-only FD to us anyway. I have verified this behavoir manually on a 4.10.8 kernel and also added a testcase.
2017-05-01fusefronted, openfiletable: move the open file table to its own packageJakob Unterwurzacher
The open file table code needs some room to grow for the upcoming FD multiplexing implementation.
2017-04-29fusefrontend: rename write_lock.go -> open_file_table.goJakob Unterwurzacher
The data structure was originally called write lock table, but is now simply called the open file table. Rename the file to reflect that.
2017-04-29fusefronted: drop unused file.String() functionJakob Unterwurzacher
This is a very old leftover.
2017-04-29readpassword: increase max password size to 2048Jakob Unterwurzacher
This is the value EncFS uses, so let's follow suit. Suggested at https://github.com/rfjakob/gocryptfs/issues/77 .
2017-04-29fix golint complaintsJakob Unterwurzacher
2017-04-29nametransform: WriteDirIV: replace ioutil.WriteFileJakob Unterwurzacher
As reported at https://github.com/rfjakob/gocryptfs/issues/105 , the "ioutil.WriteFile(file, iv, 0400)" call causes "permissions denied" errors on an NFSv4 setup. "strace"ing diriv creation and gocryptfs.conf creation shows this: conf (works on the user's NFSv4 mount): openat(AT_FDCWD, "/tmp/a/gocryptfs.conf.tmp", O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0400) = 3 diriv (fails): openat(AT_FDCWD, "/tmp/a/gocryptfs.diriv", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0400) = 3 This patch creates the diriv file with the same flags that are used for creating the conf: openat(AT_FDCWD, "/tmp/a/gocryptfs.diriv", O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0400) = 3 Closes https://github.com/rfjakob/gocryptfs/issues/105
2017-04-24forcedecode: tighten checksJakob Unterwurzacher
...and fix a few golint issues and print a scary warning message on mount. Also, force the fs to ro,noexec.
2017-04-23Add -forcedecodedanim7
Force decode of encrypted files even if the integrity check fails, instead of failing with an IO error. Warning messages are still printed to syslog if corrupted files are encountered. It can be useful to recover files from disks with bad sectors or other corrupted media. Closes https://github.com/rfjakob/gocryptfs/pull/102 .
2017-04-23Fix Flock build breakageJakob Unterwurzacher
go-fuse has added a new method to the nodefs.File interface that caused this build error: internal/fusefrontend/file.go:75: cannot use file literal (type *file) as type nodefs.File in return argument: *file does not implement nodefs.File (missing Flock method) Fixes https://github.com/rfjakob/gocryptfs/issues/104 and prevents the problem from happening again.
2017-04-01fusefrontend_reverse: switch to stable inode numbersJakob Unterwurzacher
The volatile inode numbers that we used before cause "find" to complain and error out. Virtual inode numbers are derived from their parent file inode number by adding 10^19, which is hopefully large enough no never cause problems in practice. If the backing directory contains inode numbers higher than that, stat() on these files will return EOVERFLOW. Example directory lising after this change: $ ls -i 926473 gocryptfs.conf 1000000000000926466 gocryptfs.diriv 944878 gocryptfs.longname.hmZojMqC6ns47eyVxLlH2ailKjN9bxfosi3C-FR8mjA 1000000000000944878 gocryptfs.longname.hmZojMqC6ns47eyVxLlH2ailKjN9bxfosi3C-FR8mjA.name 934408 Tdfbf02CKsTaGVYnAsSypA
2017-04-01fusefrontend_reverse: drop unused dirIVAttr functionJakob Unterwurzacher
This has long been replaced by virtualFile.GetAttr().
2017-04-01fusefrontend_reverse: convert fmt.Printf calls to tlogJakob Unterwurzacher
The fmt.Printfs output would end up in the paniclog.
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