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2018-06-19Fix three golint warningsJakob Unterwurzacher
We are clean again. Warnings were: internal/fusefrontend/fs.go:443:14: should omit type string from declaration of var cTarget; it will be inferred from the right-hand side internal/fusefrontend/xattr.go:26:1: comment on exported method FS.GetXAttr should be of the form "GetXAttr ..." internal/syscallcompat/sys_common.go:9:7: exported const PATH_MAX should have comment or be unexported
2018-06-12xattr: return EOPNOTSUPP instead of ENODATA in GetXattrJakob Unterwurzacher
Reading system.posix_acl_access and system.posix_acl_default should return EOPNOTSUPP to inform user-space that we do not support ACLs. xftestest essientially does chacl -l | grep "Operation not supported" to determine if the filesystem supports ACLs, and used to wrongly believe that gocryptfs does.
2018-05-27xattr: use LGet/LSet etcJakob Unterwurzacher
Support has been merged into the xattr package ( https://github.com/pkg/xattr/pull/29 ), use it.
2018-05-15xattr: return EOPNOTSUPP for unsupported attributesJakob Unterwurzacher
mv is unhappy when we return EPERM when it tries to set system.posix_acl_access: mv: preserving permissions for ‘b/x’: Operation not permitted Now we return EOPNOTSUPP like tmpfs does and mv seems happy.
2018-05-10xattr: optimize storage, store as binary instead of bae64Bolshevik
Values a binary-safe, there is no need to base64-encode them. Old, base64-encoded values are supported transparently on reading. Writing xattr values now always writes them binary.
2018-05-07xattr: added passing of a "flags" parameterBolshevik
Pass the "flags" parameter to the lower layer syscall. This makes Apple applications being able to successfully save data.
2018-05-01fusefrontend: xattr: return ENOSYS on unsupported flagsJakob Unterwurzacher
We previously returned EPERM to prevent the kernel from blacklisting our xattr support once we get an unsupported flag, but this causes lots of trouble on MacOS: Cannot save files from GUI apps, see https://github.com/rfjakob/gocryptfs/issues/229 Returning ENOSYS triggers the dotfiles fallback on MacOS and fixes the issue.
2018-04-17Improved xattr handling on non-linux systems (#227)bolshevik
* Fixed xattr filtering for MacOS. "system." and "user." prefixes are only relevant for Linux. * Small cleanup and additional tests.
2018-04-03fsck: report skipped corrupt filesJakob Unterwurzacher
OpenDir and ListXAttr skip over corrupt entries, readFileID treats files the are too small as empty. This improves usability in the face of corruption, but hides the problem in a log message instead of putting it in the return code. Create a channel to report these corruptions to fsck so it can report them to the user. Also update the manpage and the changelog with the -fsck option. Closes https://github.com/rfjakob/gocryptfs/issues/191
2018-04-02fusefrontend: xattr: return ENODATA for security.* and system.*Jakob Unterwurzacher
"ls -l" queries security.selinux, system.posix_acl_access, system.posix_acl_default and throws error messages if it gets something else than ENODATA.
2018-04-02fsck: clean up log outputJakob Unterwurzacher
Make sure we get only 1 warning output per problem. Also, add new corruption types to broken_fs_v1.4.
2018-04-01fusefronted: reject oversized Read and Write requestsJakob Unterwurzacher
This should not happen via FUSE as the kernel caps the size, but with fsck we have the first user that calls Read directly. For symmetry, check it for Write as well.
2018-03-28Switch from private copy to pkg/xattrJakob Unterwurzacher
Now that https://github.com/pkg/xattr/pull/24 has been merged there is no reason to keep our private copy. Switch to the upstream version.
2018-03-25fusefrontend: handle empty xattrs efficientlyJakob Unterwurzacher
We handle empty files by storing an actual empty file on disk. Handle xattrs similarily and encrypt the empty value to the empty value.
2018-03-25fusefrontend: add xattr supportJakob Unterwurzacher
At the moment, only for reverse mode. https://github.com/rfjakob/gocryptfs/issues/217
2018-03-24fusefrontend: create helpers for symlink encryptionJakob Unterwurzacher
These will be reused by the upcoming xattr support.
2018-02-28tlog: stop embedding log.Logger to prevent mistakesJakob Unterwurzacher
A few places have called tlog.Warn.Print, which directly calls into log.Logger due to embedding, losing all features of tlog. Stop embedding log.Logger to make sure the internal functions cannot be called accidentially and fix (several!) instances that did.
2018-02-18fusefrontend[_reverse]: move crypto init up to callerJakob Unterwurzacher
Both fusefrontend and fusefrontend_reverse were doing essentially the same thing, move it into main's initFuseFrontend. A side-effect is that we have a reference to cryptocore in main, which will help with wiping the keys on exit (https://github.com/rfjakob/gocryptfs/issues/211).
2018-01-25fusefrontend: drop unused haveGetdents warningJakob Unterwurzacher
We don't actually print that warning anymore.
2018-01-17fusefronted: add PlaintextNames special-cases for Create & RenameJakob Unterwurzacher
gocryptfs.longname.XXX files were considered magic in PlaintextNames mode, which was wrong. Fix that and add tests. Fixes https://github.com/rfjakob/gocryptfs/issues/174
2017-12-25fusefrontend: Use Linkat syscall to implement LinkSebastian Lackner
2017-12-25fusefrontend: Handle PlaintextNames mode in LinkSebastian Lackner
In PlaintextNames mode the "gocryptfs.longname." prefix does not have any special meaning. https://github.com/rfjakob/gocryptfs/issues/174
2017-12-03syscallcompat: convert Getdents to fd input, add emulationJakob Unterwurzacher
Now that we have Fstatat we can use it in Getdents to get rid of the path name. Also, add an emulated version of getdents for MacOS. This allows to drop the !HaveGetdents special cases from fusefrontend. Modify the getdents test to test both native getdents and the emulated version.
2017-12-01fusefrontend: Improve documentation of mkdirWithIv and WriteDirIVSebastian Lackner
As requested in https://github.com/rfjakob/gocryptfs/pull/179
2017-11-30syscallcompat: check that we get NOFOLLOW wherever possibleJakob Unterwurzacher
...and fix the instances where the AT_SYMLINK_NOFOLLOW / O_NOFOLLOW / O_EXCL flag was missing.
2017-11-29fusefrontend: allow_other: close race between mkdir and chownSebastian Lackner
Fixes the same problem as described in 72b975867a3b9bdf53fc2da62e2ba4a328d7e4ab, except for directories instead of device nodes.
2017-11-29fusefrontend: Use Fchownat to implement ChownSebastian Lackner
2017-11-29fusefrontend: Use Fchmodat to implement ChmodSebastian Lackner
2017-11-29syscallcompat: Introduce unlinkat syscall with flags argumentSebastian Lackner
2017-11-28fusefrontend: Use openBackingPath in Unlink and simplify codeSebastian Lackner
2017-11-28fusefrontend: Handle PlaintextNames mode in UnlinkSebastian Lackner
In PlaintextNames mode the "gocryptfs.longname." prefix does not have any special meaning. We should not attempt to delete any .name files. Partially fixes https://github.com/rfjakob/gocryptfs/issues/174
2017-11-28fusefrontend: Introduce a openBackingPath helper and use it to simplify ↵Sebastian Lackner
Mknod and Symlink
2017-11-28fusefrontend: allow_other: close race between symlink and chownSebastian Lackner
Fixes the same problem as described in 72b975867a3b9bdf53fc2da62e2ba4a328d7e4ab, except for symlinks instead of device nodes.
2017-11-28fusefrontend: Use the Symlinkat syscall for longname handlingSebastian Lackner
2017-11-28fusefrontend: Set owner after symlink creation in PlaintextNames modeSebastian Lackner
This is already done in regular mode, but was missing when PlaintextNames mode is enabled. As a result, symlinks created by non-root users were still owned by root afterwards. Fixes https://github.com/rfjakob/gocryptfs/issues/176
2017-11-28fusefrontend: Handle PlaintextNames mode in MknodSebastian Lackner
In PlaintextNames mode the "gocryptfs.longname." prefix does not have any special meaning. We should not attempt to read the directory IV or to create special .name files. Partially fixes https://github.com/rfjakob/gocryptfs/issues/174
2017-11-27fusefronted: allow_other: close race between mknod and chownJakob Unterwurzacher
If the user manages to replace the directory with a symlink at just the right time, we could be tricked into chown'ing the wrong file. This change fixes the race by using fchownat, which unfortunately is not available on darwin, hence a compat wrapper is added. Scenario, as described by @slackner at https://github.com/rfjakob/gocryptfs/issues/177 : 1. Create a forward mount point with `plaintextnames` enabled 2. Mount as root user with `allow_other` 3. For testing purposes create a file `/tmp/file_owned_by_root` which is owned by the root user 4. As a regular user run inside of the GoCryptFS mount: ``` mkdir tempdir mknod tempdir/file_owned_by_root p & mv tempdir tempdir2 ln -s /tmp tempdir ``` When the steps are done fast enough and in the right order (run in a loop!), the device file will be created in `tempdir`, but the `lchown` will be executed by following the symlink. As a result, the ownership of the file located at `/tmp/file_owned_by_root` will be changed.
2017-11-25fusefrontend: Skip gocryptfs.diriv handling when directory was deleted ↵Sebastian Lackner
successfully Fixes https://github.com/rfjakob/gocryptfs/issues/171 Steps to reproduce: * Create a regular forward mount point * Create a new directory in the mount point * Manually delete the gocryptfs.diriv file from the corresponding ciphertext directory * Attempt to delete the directory with 'rmdir <dirname>' Although the code explicitly checks for empty directories, it will still attempt to move the non-existent gocryptfs.diriv file and fails with: rmdir: failed to remove '<dirname>': No such file or directory
2017-11-25fusefrontend: Fix longname handling for renames with existing targetSebastian Lackner
Fixes https://github.com/rfjakob/gocryptfs/issues/170 Steps to reproduce the problem: * Create a regular forward mount point * Create a file with a shortname and one with a long filename * Try to run 'mv <shortname> <longname>' This should actually work and replace the existing file, but instead it fails with: mv: cannot move '<shortname>' to '<longname>': File exists The problem is the creation of the .name file. If the target already exists we can safely ignore the EEXIST error and just keep the existing .name file.
2017-10-21Revert most of "fusefrontend: clamp oversized reads"Jakob Unterwurzacher
We cannot return less data than requested to the kernel! From https://libfuse.github.io/doxygen/structfuse__operations.html: Read should return exactly the number of bytes requested except on EOF or error, otherwise the rest of the data will be substituted with zeroes. Reverts commit 3009ec9852316c3c696f77f476390ab5a6d8d6d7 minus the formatting improvements we want to keep. Fixes https://github.com/rfjakob/gocryptfs/issues/147 Reopens https://github.com/rfjakob/gocryptfs/issues/145
2017-10-17fusefrontend: clamp oversized readsJakob Unterwurzacher
Our byte cache pools are sized acc. to MAX_KERNEL_WRITE, but the running kernel may have a higher limit set. Clamp to what we can handle. Fixes a panic on a Synology NAS reported at https://github.com/rfjakob/gocryptfs/issues/145
2017-09-05macos: automatically remove .DS_Store on RmdirJakob Unterwurzacher
MacOS sprinkles .DS_Store files everywhere. This is hard to avoid for users, so handle it transparently in Rmdir(). Mitigates https://github.com/rfjakob/gocryptfs/issues/140
2017-09-05fusefrontend: reorder logic in Rmdir to get rid of one indentation levelJakob Unterwurzacher
Handle the errors first so that the normal code path is not indented. This should not cause any behavoir changes.
2017-09-05macos: don't throw IO errors because of .DS_Store filesJakob Unterwurzacher
MacOS creates lots of these files, and if the directory is otherwise empty, we would throw an IO error to the unsuspecting user. With this patch, we log a warning, but otherwise pretend we did not see it. Mitigates https://github.com/rfjakob/gocryptfs/issues/140
2017-09-03syscallcompat: Getdents: warn once if we get DT_UNKNOWNJakob Unterwurzacher
...and if Getdents is not available at all. Due to this warning I now know that SSHFS always returns DT_UNKNOWN: gocryptfs[8129]: Getdents: convertDType: received DT_UNKNOWN, falling back to Lstat This behavoir is confirmed at http://ahefner.livejournal.com/16875.html: "With sshfs, I finally found that obscure case. The dtype is always set to DT_UNKNOWN [...]"
2017-09-03fusefrontend: use DirIVCache in OpenDir()Jakob Unterwurzacher
Previously, OpenDir() did not use the cache at all, missing an opportunity to speed up repeated directory reads.
2017-08-15fusefrontend: use Getdents if availableJakob Unterwurzacher
Getdents avoids calling Lstat on each file.
2017-08-11main: purge masterkey from memory as soon as possibleJakob Unterwurzacher
Remove the "Masterkey" field from fusefrontend.Args because it should not be stored longer than neccessary. Instead pass the masterkey as a separate argument to the filesystem initializers. Then overwrite it with zeros immediately so we don't have to wait for garbage collection. Note that the crypto implementation still stores at least a masterkey-derived value, so this change makes it harder, but not impossible, to extract the encryption keys from memory. Suggested at https://github.com/rfjakob/gocryptfs/issues/137
2017-07-11fusefronted: enable writing to write-only filesJakob Unterwurzacher
Due to RMW, we always need read permissions on the backing file. This is a problem if the file permissions do not allow reading (i.e. 0200 permissions). This patch works around that problem by chmod'ing the file, obtaining a fd, and chmod'ing it back. Test included. Issue reported at: https://github.com/rfjakob/gocryptfs/issues/125
2017-07-02fusefrontend: doRead: skip decryption for an empty readJakob Unterwurzacher
Previously we ran through the decryption steps even for an empty ciphertext slice. The functions handle it correctly, but returning early skips all the extra calls. Speeds up the tar extract benchmark by about 4%.
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