Commit Graph

44 Commits

Author SHA1 Message Date
Jakob Unterwurzacher
e36a0ebf18 main: add "-sharedstorage" flag
At the moment, it does two things:

1. Disable stat() caching so changes to the backing storage show up
   immediately.
2. Disable hard link tracking, as the inode numbers on the backing
   storage are not stable when files are deleted and re-created behind
   our back. This would otherwise produce strange "file does not exist"
   and other errors.

Mitigates https://github.com/rfjakob/gocryptfs/issues/156
2017-11-12 20:06:13 +01:00
Jakob Unterwurzacher
a1a98abfbb main: disallow recursively encrypting ourselves
From https://github.com/rfjakob/gocryptfs/issues/150:

  mkdir a
  mkdir a/b
  gocryptsfs -init -reverse a/
  gocryptfs -reverse a/ a/b

  Now directory a/b/ contains encrypted view of 'a' but it
  is possible to descend into encrypted version of b (e.g.
  a/b/43873uhj538765387/) which contains double encrypted
  'a' and so on.

Reported-by: https://github.com/tigmac
2017-10-31 19:48:01 +01:00
Jakob Unterwurzacher
8c1b363f74 reverse mode: disable ClientInodes (hard link tracking)
Disable hard link tracking to avoid strange breakage on duplicate
inode numbers ( https://github.com/rfjakob/gocryptfs/issues/149 ).

Reverse mode is read-only, so we don't need a working link().
2017-10-22 14:43:24 +02:00
Jakob Unterwurzacher
4954c87979 Always set "max_read" kernel option
We use fixed-size byte slice pools (sync.Pool) and cannot
handle larger requests. So ask the kernel to not send
bigger ones.

Fixes https://github.com/rfjakob/gocryptfs/issues/145
2017-10-21 18:06:55 +02:00
Jakob Unterwurzacher
0c520845f3 main: purge masterkey from memory as soon as possible
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
2017-08-11 19:02:26 +02:00
Jakob Unterwurzacher
86253b7567 main: doMount: call FreeOSMemory() before jumping into server loop
scrypt (used during masterkey decryption) allocates a lot of memory.
Go only returns memory to the OS after 5 minutes, which looks like
a waste. Call FreeOSMemory() to return it immediately.

Looking a fresh mount:

before: VmRSS:	   73556 kB
after:  VmRSS:	    8568 kB
2017-07-29 17:17:12 +02:00
Jakob Unterwurzacher
0b6e3ce635 main: move redirectStdFds() to daemonize.go
This really is a part of daemonization.

No code changes.
2017-07-23 19:21:23 +02:00
Jakob Unterwurzacher
849ec10081 macos: print load_osxfuse hint if fuse.NewServer fails
Currently neither gocryptfs nor go-fuse automatically call load_osxfuse
if the /dev/osxfuse* device(s) do not exist. At least tell the user
what to do.

See https://github.com/rfjakob/gocryptfs/issues/124 for user pain.
2017-07-10 23:33:41 +02:00
Jeff Kriske
9f8e19b856 Specify a volname for osxfuse
If I use gocryptfs cypher plain then the resulting volume
should be named 'plain' just as it would be on Linux.
2017-07-10 23:19:11 +02:00
Jakob Unterwurzacher
9d10dcbd1c main: get rid of magic "MaxWrite: 1048576" constant
go-fuse caps MaxWrite at MAX_KERNEL_WRITE anyway, and we
actually depend on this behavoir now as the byte pools
are sized according to MAX_KERNEL_WRITE.

So let's use MAX_KERNEL_WRITE explicitely.
2017-07-01 11:32:17 +02:00
Jakob Unterwurzacher
a4563e21ec main, syscallcompat: use Dup3 instead of Dup2
Dup2 is not implemented on linux/arm64.

Fixes https://github.com/rfjakob/gocryptfs/issues/121 .

Also adds cross-compilation to CI.
2017-06-18 15:43:22 +02:00
Jakob Unterwurzacher
f91ce0b004 main: increase max write size to maximum
Previously, it was at the go-fuse default of 64KiB. Getting
bigger writes should increase throughput somewhat.

Testing on tmpfs shows an improvement from 112MiB/s to 120MiB/s.
2017-06-01 18:52:02 +02:00
Charles Duffy
cf1ded5236 Implement force_owner option to display ownership as a specific user. 2017-06-01 00:26:17 +02:00
Jakob Unterwurzacher
70c16fde4c main: replace paniclog with logger(1)
Instead of redirecting stdout and stderr to /tmp/gocryptfs_paniclog,
where it is hard to find, redirect them to a newly spawned logger(1)
instance that forwards the messages to syslog.

See https://github.com/rfjakob/gocryptfs/issues/109 for an example
where the paniclog was lost due to a reboot.

Also, instead of closing stdin, redirect it to /dev/null, like most
daemons seem to do.
2017-05-24 19:57:45 +02:00
Jakob Unterwurzacher
508fd9e1d6 main: downgrade panic log create failure from fatal error to warning
Exiting with a fatal error just pushes users to use "-nosyslog",
which is even worse than not having a paniclog.
2017-05-23 18:01:21 +02:00
Jakob Unterwurzacher
8aabc54276 exitcodes: get rid of generic "Mount" exit code
Instead, create three new specific exit codes:
* FuseNewServer = 19
* CtlSock = 20
* PanicLogCreate = 21
2017-05-14 13:51:26 +02:00
Jakob Unterwurzacher
d5adde1eeb exitcodes: pull all exit code definitions into the package
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 .
2017-05-07 22:16:22 +02:00
Jakob Unterwurzacher
b32fc212af main: RLIMIT_NOFILE: cap to 4096
We don't want to set the limit to unlimited if "Max" is unlimited.
Hard-cap to 4096.
2017-05-03 08:59:21 +02:00
Jakob Unterwurzacher
2d43288bc8 main: increase open file limit to 4096
Linux by default has a soft limit of 1024 and a hard limit of
4096 on open files. We can increase it so 4096 without root
permissions.

This should help reduce the risk of gocryptfs running out of
file descriptors, as reported at
https://github.com/rfjakob/gocryptfs/issues/82 .
2017-05-02 23:15:18 +02:00
Jakob Unterwurzacher
3409ade272 forcedecode: tighten checks
...and fix a few golint issues and print a scary warning message on mount.

Also, force the fs to ro,noexec.
2017-04-24 00:25:02 +02:00
danim7
f1945c4daa Add -forcedecode
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 .
2017-04-23 23:11:56 +02:00
Jakob Unterwurzacher
00df0771e3 serialize_reads: add read serialization logic
Due to kernel readahead, we usually get multiple read requests
at the same time. These get submitted to the backing storage in
random order, which is a problem if seeking is very expensive.

Details: https://github.com/rfjakob/gocryptfs/issues/92
2017-03-18 16:18:00 +01:00
Jakob Unterwurzacher
2362e67a9e cli: add "-hkdf" option
This commit also enables actually passing the HKDF setting to
fusefrontend, this was missing till now.
2017-03-07 20:56:50 +01:00
Jakob Unterwurzacher
b765cc526d main: get rid of third open paniclog fd
We have it saved in Stderr and Stdout anyway, let's free this fd
number.
2017-03-02 19:12:21 +01:00
Jakob Unterwurzacher
427c6c1719 exitcodes: define code 12 for "password incorrect" 2017-02-26 19:25:23 +01:00
Jakob Unterwurzacher
bef27305bc main: don't attempt lazy unmount on MacOSX 2017-02-15 23:20:41 +01:00
Jakob Unterwurzacher
8adfbf2dc3 Check for trailing garbage after the password
From the comment:

// CheckTrailingGarbage tries to read one byte from stdin and exits with a
// fatal error if the read returns any data.
// This is meant to be called after reading the password, when there is no more
// data expected. This helps to catch problems with third-party tools that
// interface with gocryptfs.
2017-02-12 17:59:09 +01:00
Jakob Unterwurzacher
de200aad72 main: add "-fsname" option
As requested in https://github.com/rfjakob/gocryptfs/issues/73 .
2017-01-26 22:13:57 +01:00
Jakob Unterwurzacher
39eca53677 main: make sure the ctlsock file is deleted on incorrect password
Otherwise the next try to mount ends in
"ctlsock: listen unix ctl.sock: bind: address already in use"
2017-01-26 21:32:08 +01:00
Jakob Unterwurzacher
53aedc3783 main: disconnect from the controlling terminal
This prevents us from getting SIGINT when the user
kills the running script.
2017-01-02 23:29:52 +01:00
Jakob Unterwurzacher
6af725ff09 ctlsock: exit early if socket cannot be created; delete on exit
Both are achieved by opening the socket from main and passing
it to the ctlsock package instead of passing the path.
2016-12-10 14:54:06 +01:00
Jakob Unterwurzacher
21904cd5f0 ctlsock: exit if socket cannot be created 2016-12-10 12:49:43 +01:00
Jakob Unterwurzacher
0f8d3318a3 main, fusefrontend: add "-noprealloc" option
Preallocation is very slow on hdds that run btrfs. Give the
user the option to disable it. This greatly speeds up small file
operations but reduces the robustness against out-of-space errors.

Also add the option to the man page.

More info: https://github.com/rfjakob/gocryptfs/issues/63
2016-11-25 09:19:14 +01:00
Jakob Unterwurzacher
75ebb28a62 ctlsock: add initial limited implementation
At the moment, in forward mode you can only encrypt paths
and in reverse mode you can only decrypt paths.
2016-11-10 00:27:08 +01:00
Jakob Unterwurzacher
2b991c9743 Add support for unpadded base64 filenames, "-raw64"
Through base64.RawURLEncoding.

New command-line parameter "-raw64".
2016-11-01 18:43:22 +01:00
Jakob Unterwurzacher
8ce735e987 main: print "args" slightly prettier 2016-11-01 18:30:00 +01:00
Jakob Unterwurzacher
4cc64c2c95 main: redirect panics to /tmp/gocryptfs_panic.NNNN
Redirect stdout and stderr to /tmp/gocryptfs_paniclog.NNNNNN
instead of closing them so users have a chance to get the
backtrace on a panic.

This only applies if "-nosyslog" is NOT set. Panics will
go to terminal as usual if it is.
2016-10-28 21:18:36 +02:00
Jakob Unterwurzacher
540f125f18 main: move masterkey warnings into parseMasterKey
This makes sure all callers of parseMasterKey warn the user.
At the moment there is only one, but another one will be added
soon for forcing a password change when only the master key is
known.
2016-10-16 16:20:11 +02:00
Jakob Unterwurzacher
25a8802403 main: rename "-o" option to "-ko"
This prevents confusion with the "-o" options that is passed
by mount(1) at the end of the command line.
2016-10-09 19:32:55 +02:00
Jakob Unterwurzacher
495479dc66 main: friendlier error message on wrong number of arguments
Before:
	Usage: gocryptfs [OPTIONS] CIPHERDIR MOUNTPOINT

After:
	Wrong number of arguments (have 9, want 2). You passed: "-nosyslog" "." "asd" "-q" "ß" "asdf" "fg" "gh" "sdf" "asd fs\\dfg"
	Usage: gocryptfs [OPTIONS] CIPHERDIR MOUNTPOINT
2016-10-09 18:18:14 +02:00
Jakob Unterwurzacher
dc4fdd8f44 main: fix shadow detection logic
This fired incorrectly:

	Mountpoint "/home/testuser" would shadow cipherdir "/home/testuser.cipher", this is not supported
2016-10-08 23:50:19 +02:00
Jakob Unterwurzacher
f054353bd3 reverse: make gocryptfs.conf mapping plaintextnames-aware
Only in plaintextnames-mode AND with the config file at the
default location it will be mapped into the mountpoint.

Also adds a test for that.
2016-10-08 20:57:38 +02:00
Jakob Unterwurzacher
04cdc695f0 main: error out when the mount shadows the cipherdir
For example, we cannot mount "/home/user/.cipher" at "/home/user"
because the mount will hide ".cipher" also for us.

Doing it anyway used to cause a nasty hang.
2016-10-08 18:43:31 +02:00
Jakob Unterwurzacher
631c538f13 main: split doMount into its own file
Ongoing effort to reduce the size of main().
2016-10-08 18:43:24 +02:00