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128-bit IVs are NOT used everywhere.
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This will be used for strong symlink encryption in reverse mode.
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Calling into go-fuse's loopbackFileSystem does not add
any value here.
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Also add ReverseDummyNonce nonce generation.
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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
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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.
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Protip: find naked *at syscalls using:
git grep "syscall." | grep "at(" | grep -v syscallcompat
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Also, replace remaining naked syscall.Openat calls.
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Adds a poor man's renameat implementation for OSX.
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...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.
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We will get more of them as OSX also lacks support for openat.
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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.
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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 .
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These are large complicated implementations that will share some
code.
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The name could be misunderstood and actually caused a bug:
doWrite used to always preallocate 4128 instead of the actual
data length.
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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
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XFS returns a different error code if you try to overwrite
a non-empty directory with a directory:
XFS: mv: cannot move ‘foo’ to ‘bar/foo’: File exists
ext4: mv: cannot move 'foo' to 'bar/foo': Directory not empty
So have EEXIST trigger the Rmdir logic as well.
Fixes issue #20
Link: https://github.com/rfjakob/gocryptfs/issues/20
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The "!fs.args.DirIV" special case was removed by b17f0465c7
but that, by accident, also removed the handling for
PlaintextNames.
Re-add it as an explicit PlaintextNames special case.
Also adds support for removing directories that miss their
gocryptfs.diriv file for some reason.
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FUSE filesystems are mounted with "nosuid" by default. If we run as root,
we can use device files by passing the opposite mount option, "suid".
Also we have to use syscall.Chmod instead of os.Chmod because the
portability translation layer "syscallMode" messes up the sgid
and suid bits.
Fixes 70% of the failures in xfstests generic/193. The remaining are
related to truncate, but we err on the safe side:
$ diff -u tests/generic/193.out /home/jakob/src/fuse-xfstests/results//generic/193.out.bad
[...]
check that suid/sgid bits are cleared after successful truncate...
with no exec perm
before: -rwSr-Sr--
-after: -rw-r-Sr--
+after: -rw-r--r--
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If allow_other is set and we run as root, try to give newly created files to
the right user.
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Support truncate(2) by opening the file and calling ftruncate(2)
While the glibc "truncate" wrapper seems to always use ftruncate, fsstress from
xfstests uses this a lot by calling "truncate64" directly.
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The GCMIV128 feature flag is already mandatory, dropping the command
line option is the final step.
Completes https://github.com/rfjakob/gocryptfs/issues/29 .
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The EMENames feature flag is already mandatory, dropping the command
line option is the final step.
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The DirIV feature flag is already mandatory, dropping the command
line option is the final step.
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tlog is used heavily everywhere and deserves a shorter name.
Renamed using sed magic, without any manual rework:
find * -type f -exec sed -i 's/toggledlog/tlog/g' {} +
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Warnings were:
main.go:234: declaration of err shadows declaration at main.go:163:
internal/fusefrontend/file.go:401: declaration of err shadows declaration at internal/fusefrontend/file.go:379:
internal/fusefrontend/file.go:419: declaration of err shadows declaration at internal/fusefrontend/file.go:379:
internal/fusefrontend/fs_dir.go:140: declaration of err shadows declaration at internal/fusefrontend/fs_dir.go:97:
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If /proc/self/fd/X did not exist, the actual error is that the file
descriptor was invalid.
go-fuse's pathfs prefers using an open fd even for path-based operations
but does not take any locks to prevent the fd from being closed.
Instead, it retries the operation by path if it get EBADF. So this
change allows the retry logic to work correctly.
This fixes the error
rsync: failed to set times on "/tmp/ping.Kgw.mnt/linux-3.0/[...]/.dvb_demux.c.N7YlEM":
No such file or directory (2)
that was triggered by pingpong-rsync.bash.
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We (actually, go-fuse) used to call Chown() instead of Lchown()
which meant that the operation would fail on dangling symlinks.
Fix this by calling os.Lchown() ourself. Also add a test case
for this.
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Just presenting an empty directory means that the user does not know
that things went wrong unless he checks the syslog or tries to delete
the directory.
It would be nice to report the error even if only some files were
invalid. However, go-fuse does not allow returning the valid
directory entries AND an error.
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... with the "released" boolean.
For some reason, the "f.fd.Fd() < 0" check did not work reliably,
leading to nil pointer panics on the following wlock.lock().
The problem was discovered during fsstress testing and is unlikely
to happen in normal operations.
With this change, we passed 1700+ fsstress iterations.
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Using a simple boolean was racy (which was harmless
in this case) and non-idomatic.
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The Fstat call should never fail, but still, if it does return an error
it should be handled properly.
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mapMutex can be anonymous and using an RWMutex is overkill
because the lock protects very short sections.
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The functionality has long been replaced by the fd < 0
check.
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Paths in statfs() calls were not encrypted resulting in
an Function not implemented error, when the unencrypted
path didn't exist in the underlying (encrypted)
filesystem.
$ df plain/existingdir
df: ‘plain/existingdir’: Function not implemented
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Commit 730291feab properly freed wlock when the file descriptor is
closed. However, concurrently running Write and Truncates may
still want to lock it. Check if the fd has been closed first.
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The write lock was not freed on release, causing a slow memory leak.
This was noticed by running extractloop.bash for 10 hours.
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This makes gocryptfs work at all on ZFS.
See https://github.com/rfjakob/gocryptfs/issues/22 .
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Among those one real bug.
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Using dirfd-relative operations allows safe lockless handling
of the ".name" files.
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Todo: Rename, Unlink, Rmdir, Mknod, Mkdir
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