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2019-01-01fusefrontend: make Readlink() symlink-safeJakob Unterwurzacher
Now symlink-safe through Readlinkat().
2019-01-01fusefrontend: make OpenDir() symlink-safeJakob Unterwurzacher
Interestingly, little or no performance impact: $ ./benchmark.bash Testing gocryptfs at /tmp/benchmark.bash.39W: gocryptfs v1.6-42-g30c2349-dirty; go-fuse v20170619-66-g6df8ddc; 2018-11-04 go1.11 Downloading linux-3.0.tar.gz /tmp/linux-3.0.tar.gz 100%[=========================================================================>] 92.20M 2.93MB/s in 31s 2018-11-04 21:44:44 URL:https://cdn.kernel.org/pub/linux/kernel/v3.0/linux-3.0.tar.gz [96675825/96675825] -> "/tmp/linux-3.0.tar.gz" [1] WRITE: 262144000 bytes (262 MB, 250 MiB) copied, 1.1808 s, 222 MB/s READ: 262144000 bytes (262 MB, 250 MiB) copied, 0.866438 s, 303 MB/s UNTAR: 24.745 MD5: 12.050 LS: 3.525 RM: 9.544 Note: kernel has been updated: $ uname -a Linux brikett 4.18.16-200.fc28.x86_64 #1 SMP Sat Oct 20 23:53:47 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
2019-01-01fusefrontend: mark a few more functions as symlink-safe / unsafeJakob Unterwurzacher
2019-01-01fusefrontend: use openBackingDir in ctlsock interfaceJakob Unterwurzacher
Instead of calling syscall.Open() ourselves, rely on openBackingDir().
2019-01-01fusefrontend: make GetAttr() symlink-safeJakob Unterwurzacher
Use openBackingDir() and Fstatat(). High performance impact, though part of it should be mitigated by adding DirIV caching to the new code paths. $ ./benchmark.bash Testing gocryptfs at /tmp/benchmark.bash.Eou: gocryptfs v1.6-37-ge3914b3-dirty; go-fuse v20170619-66-g6df8ddc; 2018-10-14 go1.11 WRITE: 262144000 bytes (262 MB, 250 MiB) copied, 1.2289 s, 213 MB/s READ: 262144000 bytes (262 MB, 250 MiB) copied, 1.02616 s, 255 MB/s UNTAR: 24.490 MD5: 13.120 LS: 3.368 RM: 9.232
2019-01-01fusefrontend: make openBackingDir() symlink-safeJakob Unterwurzacher
openBackingDir() used encryptPath(), which is not symlink-safe itself. Drop encryptPath() and implement our own directory walk. Adds three seconds to untar and two seconds to rm: $ ./benchmark.bash Testing gocryptfs at /tmp/benchmark.bash.MzG: gocryptfs v1.6-36-g8fb3c2f-dirty; go-fuse v20170619-66-g6df8ddc; 2018-10-14 go1.11 WRITE: 262144000 bytes (262 MB, 250 MiB) copied, 1.25078 s, 210 MB/s READ: 262144000 bytes (262 MB, 250 MiB) copied, 1.0318 s, 254 MB/s UNTAR: 20.941 MD5: 11.568 LS: 1.638 RM: 5.337
2019-01-01fusefrontend: mark symlink-safe FUSE callsJakob Unterwurzacher
Document which FUSE calls are already symlink-safe in the function comment.
2019-01-01fusefrontend: make DecryptPath() symlink-safeJakob Unterwurzacher
DecryptPath is now symlink-safe through the use of *at() functions.
2019-01-01fusefrontend: make Access() symlink-safe.Jakob Unterwurzacher
Make Access() symlink-safe through use of faccessat.
2019-01-01nametransform: comments: directly link to ioutil.WriteFile fixJakob Unterwurzacher
So the reader does not have to read through the whole ticket. The commit message has a nice summary of the problem.
2019-01-01fusefrontend: Fix debug message in doWrite() method.Sebastian Lackner
2019-01-01fusefrontend: Fix order of arguments in debug message for Read() FUSE call.Sebastian Lackner
2019-01-01nametransform: Delete incomplete longname files on error.Sebastian Lackner
2018-12-28configfile: Fix a copy&paste error in validateParams method.Sebastian Lackner
2018-12-27configfile: Explicitly wipe scrypt derived key after decrypting/encrypting ↵Sebastian Lackner
master key. Further raises the bar for recovering keys from memory.
2018-12-27Assorted spelling fixes.Sebastian Lackner
Mostly detected with the 'codespell' utility, but also includes some manual grammar fixes.
2018-12-27fusefrontend: Remove unnecessary check in doRead function.Sebastian Lackner
The same condition is already checked a few lines above, and 'err' is not changed inbetween.
2018-12-27fusefrontend: Don't treat Fchownat error as failure in Mkdir.Sebastian Lackner
The directory was already created, so return success even if Fchownat fails. The same error handling is already used if fs.args.PlaintextNames is false.
2018-12-27fusefrontend: Check the correct 'err' variable.Sebastian Lackner
2018-12-16tests: fix TestPassfileNewlineJakob Unterwurzacher
Due to a copy-paste error, we ran the wrong test in the subprocess. Thanks @slackner for noticing at https://github.com/rfjakob/gocryptfs/commit/295d432175292dbaef572093d784aab55f5c0b8f#r31690478 !
2018-12-15passfile: directly read file instead of invoking catJakob Unterwurzacher
Allows better error handling, gets rid of the call to an external program, and fixes https://github.com/rfjakob/gocryptfs/issues/278 .
2018-11-17syscallcompat: downgrade DT_UNKNOWN message level on XFSJakob Unterwurzacher
Old XFS filesystems always return DT_UNKNOWN. Downgrade the message to "info" level if we are on XFS. Using the "warning" level means that users on old XFS filesystems cannot run the test suite as it intentionally aborts on any warnings. Fixes https://github.com/rfjakob/gocryptfs/issues/267
2018-10-17tlog: disable color codes when switching to syslogJakob Unterwurzacher
When gocryptfs was started on a terminal and later daemonized, the color codes stayed active in the syslog output. The codes are not visible in "journalctl -f", which is why I have not noticed it yet, but they do show up in normal syslog as the usual "#033[33m" crap.
2018-10-17fusefronted: log more details on WriteAt failuresJakob Unterwurzacher
Also log inode number, fd number, offset and length. Maybe help debugging https://github.com/rfjakob/gocryptfs/issues/269 .
2018-10-11Add option for autounmountJesse Dunietz
Even though filesystem notifications aren't implemented for FUSE, I decided to try my hand at implementing the autounmount feature (#128). I based it on the EncFS autounmount code, which records filesystem accesses and checks every X seconds whether it's idled long enough to unmount. I've tested the feature locally, but I haven't added any tests for this flag. I also haven't worked with Go before. So please let me know if there's anything that should be done differently. One particular concern: I worked from the assumption that the open files table is unique per-filesystem. If that's not true, I'll need to add an open file count and associated lock to the Filesystem type instead. https://github.com/rfjakob/gocryptfs/pull/265
2018-10-11tests: syscallcompat: allow failure for symlinks > 1000Jakob Unterwurzacher
MacOS and old XFS versions do not support very long symlinks, but let's not make the tests fail because of that. https://github.com/rfjakob/gocryptfs/issues/267
2018-09-23fusefrontend: Fix uint16 build failure on DarwinJakob Unterwurzacher
Error was: # github.com/rfjakob/gocryptfs/internal/fusefrontend internal/fusefrontend/fs.go:179: cannot use perms | 256 (type uint16) as type uint32 in argument to syscall.Fchmod internal/fusefrontend/fs.go:185: cannot use perms (type uint16) as type uint32 in argument to syscall.Fchmod
2018-09-23fusefrontend: make Rename() symlink-safeJakob Unterwurzacher
Use Openat() and the openBackingDir() helper so we never follow symlinks.
2018-09-23fusefrontend: make Create() symlink-safeJakob Unterwurzacher
Use Openat() and the openBackingDir() helper so we never follow symlinks.
2018-09-23fusefrontend: Open(): fix dirfd leakJakob Unterwurzacher
Close was missing.
2018-09-23fusefrontend: add named parameters to openBackingDirJakob Unterwurzacher
Named parameters make using the function easier.
2018-09-23fusefrontend: get rid of os.File* wrappingJakob Unterwurzacher
Directly use int file descriptors for the dirfd and get rid of one level of indirection.
2018-09-23fusefrontent: make Open() symlink-safeJakob Unterwurzacher
2018-09-23tlog: always trim trailing newlinesJakob Unterwurzacher
The messages we print through tlog sometimes do, sometimes do not contain a trailing newline. The stdlib logger usually drops trailing newlines automatically, but tlog postfixes ColorReset to the caller's message, so the logger logic does not work when we print colored output. Drop the newlines on our own, and add a test. Fixes the blank lines in fsck output: ~/go/src/github.com/rfjakob/gocryptfs/tests/fsck$ ./run_fsck.bash Reading password from extpass program Decrypting master key OpenDir "": invalid entry "invalid_file_name.3": illegal base64 data at input byte 17 OpenDir "": invalid entry "invalid_file_name_2": bad message fsck: corrupt entry in dir "": "invalid_file_name.3" fsck: corrupt entry in dir "": "invalid_file_name_2" OpenDir "": invalid entry "invalid_file_name____1": bad message fsck: corrupt entry in dir "": "invalid_file_name____1" doRead 4327225: corrupt block #0: stupidgcm: message authentication failed fsck: error reading file "corrupt_file" (inum 4327225): 5=input/output error cipherSize 40 < overhead 50: corrupt file doRead 4327074: corrupt header: ParseHeader: invalid version, want=2 have=22616 cipherSize 40 < overhead 50: corrupt file fsck: error reading file "corrupt_file_2" (inum 4327074): 5=input/output error Readlink "s-P7PcQDUcVkoeMDnC3EYA": decrypting target failed: stupidgcm: message authentication failed fsck: error reading symlink "corrupt_symlink": 5=input/output error Readlink "iI0MtUdzELPeOAZYwYZFee169hpGgd3l2PXQBcc9sl4": decrypting target failed: illegal base64 data at input byte 0 fsck: error reading symlink "corrupt_symlink_2": 5=input/output error OpenDir "yrwcjj2qoC4IYvhw9sbfRg": could not read gocryptfs.diriv: wanted 16 bytes, got 17 fsck: error opening dir "diriv_too_long": 5=input/output error OpenDir "trqecbMNXdzLqzpk7fSfKw": could not read gocryptfs.diriv: wanted 16 bytes, got 3 fsck: error opening dir "diriv_too_short": 5=input/output error cipherSize 8 < header size 18: corrupt file readFileID 4327049: incomplete file, got 8 instead of 19 bytes fsck: corrupt file "incomplete_file_1" (inode 4327049) readFileID 4327038: incomplete file, got 18 instead of 19 bytes fsck: corrupt file "incomplete_file_2" (inode 4327038) cipherSize 1 < header size 18: corrupt file readFileID 4327063: incomplete file, got 1 instead of 19 bytes fsck: corrupt file "incomplete_file_3" (inode 4327063) fsck: error opening dir "missing_diriv": 2=no such file or directory ListXAttr: invalid xattr name "user.gocryptfs.0a5e7yWl0SGUGeWB0Sy2K0": bad message fsck: corrupt xattr name on file "xattr_corrupt_name": "user.gocryptfs.0a5e7yWl0SGUGeWB0Sy2K0" GetXAttr: stupidgcm: message authentication failed fsck: error reading xattr "user.foo" from "xattr_corrupt_value": 5=input/output error fsck summary: 15 corrupt files
2018-09-22syscallcompat: untangle Openat flag checkJakob Unterwurzacher
Check for O_NWFOLLOW and O_EXCL separately to make the logic clearer.
2018-09-08fusefrontend: use OpenDirNofollow in openBackingDirJakob Unterwurzacher
Rename openBackingPath to openBackingDir and use OpenDirNofollow to be safe against symlink races. Note that openBackingDir is not used in several important code paths like Create(). But it is used in Unlink, and the performance impact in the RM benchmark to be acceptable: Before $ ./benchmark.bash Testing gocryptfs at /tmp/benchmark.bash.bYO: gocryptfs v1.6-12-g930c37e-dirty; go-fuse v20170619-49-gb11e293; 2018-09-08 go1.10.3 WRITE: 262144000 bytes (262 MB, 250 MiB) copied, 1.07979 s, 243 MB/s READ: 262144000 bytes (262 MB, 250 MiB) copied, 0.882413 s, 297 MB/s UNTAR: 16.703 MD5: 7.606 LS: 1.349 RM: 3.237 After $ ./benchmark.bash Testing gocryptfs at /tmp/benchmark.bash.jK3: gocryptfs v1.6-13-g84d6faf-dirty; go-fuse v20170619-49-gb11e293; 2018-09-08 go1.10.3 WRITE: 262144000 bytes (262 MB, 250 MiB) copied, 1.06261 s, 247 MB/s READ: 262144000 bytes (262 MB, 250 MiB) copied, 0.947228 s, 277 MB/s UNTAR: 17.197 MD5: 7.540 LS: 1.364 RM: 3.410
2018-09-08syscallcompat: use O_PATH in OpenDirNofollowJakob Unterwurzacher
This fixes the "0100 directory" problem in reverse mode, and should be slightly faster.
2018-09-08syscallcompat: untangle OpenNofollow and rename to OpenDirNofollowJakob Unterwurzacher
The function used to do two things: 1) Walk the directory tree in a manner safe from symlink attacks 2) Open the final component in the mode requested by the caller This change drops (2), which was only used once, and lets the caller handle it. This simplifies the function and makes it fit for reuse in forward mode in openBackingPath(), and for using O_PATH on Linux.
2018-09-08configfile: add LoadAndDecrypt wrapperJakob Unterwurzacher
Callers that do not want to decrypt the masterkey should call plain Load(). https://github.com/rfjakob/gocryptfs/issues/258
2018-09-08configfile: split off masterkey decryptionJakob Unterwurzacher
Preparation for fixing https://github.com/rfjakob/gocryptfs/issues/258
2018-09-08configfile: return specific error on empty inputJakob Unterwurzacher
Report the actual problem instead of a generic "unexpected end of JSON input". https://github.com/rfjakob/gocryptfs/issues/258
2018-08-26syscallcompat: drop Fchmodat flagsv1.6.1Jakob Unterwurzacher
These were silently ignored until now (!) but are rejected by Go 1.11 stdlib. Drop the flags so the tests work again, until we figure out a better solution. https://github.com/golang/go/issues/20130
2018-08-15trezor: show support in version stringJakob Unterwurzacher
Show enable_trezor in the version string if we were compiled with `-tags enable_trezor`. And hide the `-trezor` flag from the help output if we were not.
2018-08-15fusefrontend: truncateGrowFile: pass zeroPad error to callerJakob Unterwurzacher
Errors from zeroPad were ignored until now, as discovered using xfstests generic/083.
2018-08-15fusefrontend_reverse: reject excludes for the root directory ""Jakob Unterwurzacher
This is most likely a mistake by the user. Reject it.
2018-08-11reverse mode: add --exclude optionJakob Unterwurzacher
https://github.com/rfjakob/gocryptfs/issues/235
2018-07-23configfile: drop superflous PrintfJakob Unterwurzacher
Before: $ gocryptfs -fsck . LoadConfFile: ReadFile: &os.PathError{Op:"open", Path:"/var/tmp/check-gocryptfs/scratchdev/gocryptfs.conf", Err:0xd} Cannot open config file: open /var/tmp/check-gocryptfs/scratchdev/gocryptfs.conf: permission denied After: $ gocryptfs -fsck . Cannot open config file: open /var/tmp/check-gocryptfs/scratchdev/gocryptfs.conf: permission denied
2018-07-22fusefronted: disallow writes running concurrently with readsJakob Unterwurzacher
As uncovered by xfstests generic/465, concurrent reads and writes could lead to this, doRead 3015532: corrupt block #1039: stupidgcm: message authentication failed, as the read could pick up a block that has not yet been completely written - write() is not atomic! Now writes take ContentLock exclusively, while reads take it shared, meaning that multiple reads can run in parallel with each other, but not with a write. This also simplifies the file header locking.
2018-07-15fusefrontend: doWrite: delete file header if first write failsJakob Unterwurzacher
xfstests generic/083 fills the filesystem almost completely while running fsstress in parallel. In fsck, these would show up: readFileID 2580: incomplete file, got 18 instead of 19 bytes This could happen when writing the file header works, but writing the actual data fails. Now we kill the header again by truncating the file to zero.
2018-07-15fusefrontend: doWrite: no need to take HeaderLock.RLock()Jakob Unterwurzacher
Other writers are blocked by ContentLock already.
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