eCryptfs

Can't parse passphrase with "=" from passphrase_passwd_file

Bug #1419861 reported by Lukáš Karas on 2015-02-09

This bug affects 2 people

Affects		Status	Importance	Assigned to	Milestone
	eCryptfs	Fix Committed	Undecided	Unassigned

Bug Description

I am not able to mount my ecryptfs FS using passphrase in file (option key=passphrase:passphrase_passwd_file=file.txt) when passphrase contains equals character (for example "passphrase_passwd=abc=123").

In this case, I get this error message (in syslog):
mount.ecryptfs: tf_pass_file: Cannot find [passwd] directive

It works fine in interactive mode or if passphrase don't contains equals character.

It looks like bug in "parse_options_file" function called from here:
http://bazaar.launchpad.net/~ecryptfs/ecryptfs/trunk/view/head:/src/key_mod/ecryptfs_key_mod_passphrase.c#L76

Related branches

lp:~wlxing/ecryptfs/fix-bug-1678689

Merged into lp:ecryptfs at revision 886

Tyler Hicks: Approve on 2017-05-25

Michal Hlavinka: Pending requested 2017-04-03

lp:ecryptfs

Revision history for this message

Jason Xing (wlxing) wrote on 2017-03-28:

Hi Lukáš Karas,

Are you still working on that issue? Or have you fixed that bug? I'm assigning this bug to myself.
If you've already done that, please let me know. Thank you.

Jason

Changed in ecryptfs:
assignee:	nobody → Jason Xing (wlxing)
status:	New → In Progress

Revision history for this message

Lukáš Karas (lukas-karas) wrote on 2017-03-28:

No, I was not work on this. I just change my password and report the bug :-) Thank you that you will look at it.

Revision history for this message

Jason Xing (wlxing) wrote on 2017-03-28:

Hi Lukáš Karas,

I quick go through this part in source code. This is not a bug because the code shows that we should not use '=' character when we mount ecryptfs with "-o passphrase_passwd_file=[filename]".
[code link: http://bazaar.launchpad.net/~ecryptfs/ecryptfs/trunk/view/head:/src/libecryptfs/cmd_ln_parser.c#L257]

But I still want to know why the developers of eCryptfs confine users to this(unable to use '=' character, for example). Anyone who have any comments on this are welcome!

Jason

Changed in ecryptfs:
status:	In Progress → Invalid
assignee:	Jason Xing (wlxing) → nobody

Revision history for this message

Jason Xing (wlxing) wrote on 2017-03-29:

I still think it is a bug because there is no reason that eCryptfs doesn't allow users to choose the passphrase including '=' character : -)

Changed in ecryptfs:
status:	Invalid → Confirmed
assignee:	nobody → Jason Xing (wlxing)

Revision history for this message

Jason Xing (wlxing) wrote on 2017-03-29:

Also, my explanation about that source code maybe wrong. I will check that one more time. I'm sorry.

Jason Xing (wlxing) on 2017-03-29

Changed in ecryptfs:
status:	Confirmed → In Progress

Revision history for this message

Jason Xing (wlxing) wrote on 2017-04-02:

bug1419861.patch Edit (364 bytes, text/plain)

Hello Tyler Hicks,

I have fixed this bug and push it to my branch (link: https://code.launchpad.net/~wlxing/ecryptfs/ecryptfs).
Could you have some time to look at that (adding only 2 lines) : -)

BTW, the patch is attached but it is not the standard format. Could you(or someone else) help me make a standard patch?

I would appreciate it!

Cheers,
Jason

Revision history for this message

Tyler Hicks (tyhicks) wrote on 2017-05-25:

Applied to lp:ecryptfs as r886