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2018-01-25syscallcompat: fix reversed warning outputJakob Unterwurzacher
We used to print somewhat strange messages: Getdents: corrupt entry #1: Reclen=276 > 280. Returning EBADR Reported at https://github.com/rfjakob/gocryptfs/issues/197
2018-01-25syscallcompat: explain why we don't use syscall.ParseDirent()Jakob Unterwurzacher
syscall.ParseDirent only returns the NAMES, we want everything.
2017-12-25fusefrontend: Use Linkat syscall to implement LinkSebastian Lackner
2017-12-07syscallcompat: add FaccessatJakob Unterwurzacher
Add faccessat(2) with a hack for symlink, because the kernel does not actually looks at the passed flags. From man 2 faccessat: C library/kernel differences The raw faccessat() system call takes only the first three argu‐ ments. The AT_EACCESS and AT_SYMLINK_NOFOLLOW flags are actually implemented within the glibc wrapper function for faccessat().
2017-12-06syscallcompat: add ReadlinkatJakob Unterwurzacher
We need readlinkat to implement Readlink symlink-race-free.
2017-12-06syscallcompat: add Darwin version of unix2syscallJakob Unterwurzacher
The "Atim" field is called "Atimespec" on Darwin, same for Mtim and Ctim.
2017-12-06fusefrontend_reverse: secure GetAttr against symlink racesJakob Unterwurzacher
...by using the OpenNofollow helper & Fstatat. Also introduce a helper to convert from unix.Stat_t to syscall.Stat_t. Tracking ticket: https://github.com/rfjakob/gocryptfs/issues/165
2017-12-05syscallcompat: OpenNofollow: use O_DIRECTORY flagJakob Unterwurzacher
...when opening intermedia directories to give us an extra layer of safety. From the FreeBSD man page: This flag can be used to prevent applications with elevated privileges from opening files which are even unsafe to open with O_RDONLY, such as device nodes.
2017-12-05syscallcompat: OpenNofollow: fix relPath="" caseJakob Unterwurzacher
Sometimes want to open baseDir itself. This case was broken, fix it.
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.
2017-12-03syscallcompat: add Fstatat + emulation + testJakob Unterwurzacher
Fstatat has recently been added to x/sys/unix. Make it available for use in gocryptfs.
2017-12-02syscallcompat: add OpenNofollow helperJakob Unterwurzacher
OpenNofollow = symlink-race-safe Open Prepares fixing https://github.com/rfjakob/gocryptfs/issues/165
2017-12-02syscallcompat: move test setup into its own fileJakob Unterwurzacher
The infrastructure will also be used by the upcoming OpenNofollow tests.
2017-12-02syscallcompat: use Unlinkat and Symlinkat from x/sys/unixJakob Unterwurzacher
I'm unsure why I did not notice this earlier, but the syscall wrappers provided by x/sys/unix seem to do just fine. Drop our own version.
2017-12-01syscallcompat: Improve the Openat and Mknodat syscall emulationSebastian Lackner
This avoids the conversion to an absolute path.
2017-12-01syscallcompat: Fix syscall emulation for absolute pathsSebastian Lackner
For absolute paths, the file descriptor should be ignored. In such a case there is also no need to hold the lock or change the working directory.
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.
2017-11-30syscallcompat: add tests for emulated syscallsJakob Unterwurzacher
Also fix the bug in emulateFchmodat that was found by the tests.
2017-11-30syscallcompat: build emulated syscalls under linux, tooJakob Unterwurzacher
This will allow to test them under linux as well.
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 Fchmodat to implement ChmodSebastian Lackner
2017-11-29syscallcompat: Introduce unlinkat syscall with flags argumentSebastian Lackner
2017-11-28fusefrontend: Use the Symlinkat syscall for longname handlingSebastian Lackner
2017-11-28syscallcompat: Fix Fchownat syscall wrapper on darwinSebastian Lackner
* Acquire the lock before reading the current directory * Fix a file descriptor leak
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.
2017-10-22tests: don't read /proc, the number of entries changes too quicklyJakob Unterwurzacher
This could lead to test failures like this: --- FAIL: TestGetdents (0.02s) getdents_test.go:57: len(getdentsEntries)=362, len(readdirEntries)=360 FAIL
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 [...]"
2017-08-15syscallcompat: implement Getdents()Jakob Unterwurzacher
The Readdir function provided by os is inherently slow because it calls Lstat on all files. Getdents gives us all the information we need, but does not have a proper wrapper in the stdlib. Implement the "Getdents()" wrapper function that calls syscall.Getdents() and parses the returned byte blob to a fuse.DirEntry slice.
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.
2017-02-16syscallcompat: OSX compat: fix variable warningsJakob Unterwurzacher
As suggested by https://github.com/rfjakob/gocryptfs/issues/15#issuecomment-279130217
2016-10-04A few more lint fixesJakob Unterwurzacher
2016-10-04lint fixesValient Gough
2016-07-06Add godoc comments to all internal packagesJakob Unterwurzacher
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.
2016-07-03syscallcompat: 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.
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