Re: encfs over sshfs suffering with permission problem
"J. B" <bakshi12@gmail.com> writes:
> On Fri, 23 Nov 2012 16:02:28 +0530
> Kushal Kumaran <kushal.kumaran+debian@gmail.com> wrote:
>
>> "J. B" <bakshi12@gmail.com> writes:
>>
>> > On Fri, 23 Nov 2012 09:28:21 +0530
>> > Kushal Kumaran <kushal.kumaran+debian@gmail.com> wrote:
>> >
>> >
>> >>
>> >> 1. Ensure both encfs and sshfs are running as you, not root or any other
>> >> user.
>> >>
>> >
>> > Confirmed
>> >
>> >> 2. Check for I/O errors both on the local box and the remote box (run
>> >> dmesg and look for suspicious logs).
>> >>
>> > nothing found
>> >
>> >> 3. Verify that you are able to create, delete and rename files on the
>> >> sshfs mountpoint directly. Verify that newly-created files are writable
>> >> by you.
>> >
>> > on sshfs mount point
>> > ----------------------
>> >
>> > echo "test" > test.txt
>> > echo "test more" >> test.txt
>> >
>> > cat test.txt
>> > test
>> > test more
>> >
>> > mv test.txt test12.txt
>> >
>> > rm test12.txt
>> >
>> >>
>> >> 4. After mounting using sshfs and encfs, attach strace to the encfs
>> >> process (run strace -p <encfs-pid> -o ~/encfs.log -f), and try to create
>> >> a single file in the sshfs mountpoint (presumably this fails). Then
>> >> detach the strace (C-c in that shell), and examine encfs.log for
>> >> permission errors (EPERM). If you do not understand the log, reply back
>> >> with a link to the log. The log might be large, so upload it to, for
>> >> example, paste.debian.net, rather than attaching it to your email.
>> >>
>> >
>> > cd to encfs mout point
>> >
>> > cd ../pcbackup_decrypt/
>> >
>> > touch 123
>> > touch: cannot touch `123': Permission denied
>> >
>> > log from strace
>> >
>> > <snipped log>
>>
>> The log would suggest that encfs did not even attempt to create the
>> file, which is strange. Run encfs with the -f and -v options, and see
>> if it generates any error messages in its logs while you try to write to
>> the filesystem.
>>
> when try to create I get the following
> ========================================
>
>
> 16:58:08 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0
> 16:58:08 (FileNode.cpp:127) calling setIV on (null)
> 16:58:08 (DirNode.cpp:770) created FileNode for /tmp/pcbackup_encrypt/
> 16:58:08 (encfs.cpp:134) getattr /tmp/pcbackup_encrypt/
> 16:58:08 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0
> 16:58:08 (FileNode.cpp:127) calling setIV on (null)
> 16:58:08 (DirNode.cpp:770) created FileNode for /tmp/pcbackup_encrypt/
> 16:58:08 (encfs.cpp:134) getattr /tmp/pcbackup_encrypt/
> 16:58:08 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0
> 16:58:08 (FileNode.cpp:127) calling setIV on (null)
> 16:58:09 (RawFileIO.cpp:191) getAttr error on /tmp/pcbackup_encrypt/SqUeX,,Q7SGt21hq7ByV-Zvc: No such file or directory
> 16:58:09 (CipherFileIO.cpp:105) in setIV, current IV = 0, new IV = 15501057619517851372, fileIV = 0
> 16:58:09 (DirNode.cpp:770) created FileNode for /tmp/pcbackup_encrypt/SqUeX,,Q7SGt21hq7ByV-Zvc
> 16:58:09 (encfs.cpp:134) getattr /tmp/pcbackup_encrypt/SqUeX,,Q7SGt21hq7ByV-Zvc
> 16:58:09 (RawFileIO.cpp:191) getAttr error on /tmp/pcbackup_encrypt/SqUeX,,Q7SGt21hq7ByV-Zvc: No such file or directory
> 16:58:09 (encfs.cpp:138) getattr error: No such file or directory
> 16:58:09 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0
> 16:58:09 (FileNode.cpp:127) calling setIV on (null)
> 16:58:09 (RawFileIO.cpp:191) getAttr error on /tmp/pcbackup_encrypt/SqUeX,,Q7SGt21hq7ByV-Zvc: No such file or directory
> 16:58:09 (CipherFileIO.cpp:105) in setIV, current IV = 0, new IV = 15501057619517851372, fileIV = 0
> 16:58:09 (DirNode.cpp:770) created FileNode for /tmp/pcbackup_encrypt/SqUeX,,Q7SGt21hq7ByV-Zvc
> 16:58:09 (encfs.cpp:134) getattr /tmp/pcbackup_encrypt/SqUeX,,Q7SGt21hq7ByV-Zvc
> 16:58:10 (RawFileIO.cpp:191) getAttr error on /tmp/pcbackup_encrypt/SqUeX,,Q7SGt21hq7ByV-Zvc: No such file or directory
> 16:58:10 (encfs.cpp:138) getattr error: No such file or directory
> 16:58:15 (MACFileIO.cpp:75) fs block size = 1024, macBytes = 8, randBytes = 0
> 16:58:15 (FileNode.cpp:127) calling setIV on (null)
> 16:58:15 (DirNode.cpp:770) created FileNode for /tmp/pcbackup_encrypt/
> 16:58:15 (encfs.cpp:134) getattr /tmp/pcbackup_encrypt/
> ^C16:58:19 (openssl.cpp:48) Allocating 41 locks for OpenSSL
This problem is beyond my understanding of encfs. You can try the encfs
mailing list at http://sourceforge.net/mail/?group_id=97461. Do provide
these logs along with your description of the problem.
If possible, you can try the testing versions of sshfs and encfs.
--
regards,
kushal
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