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Bug 677665

Summary: pinentry-ncurses fails if current tty is owned by different user as the one running pinentry
Product: Red Hat Enterprise Linux 6 Reporter: Miroslav Vadkerti <mvadkert>
Component: pinentryAssignee: Stanislav Ochotnicky <sochotni>
Status: CLOSED ERRATA QA Contact: BaseOS QE Security Team <qe-baseos-security>
Severity: medium Docs Contact:
Priority: medium    
Version: 6.1CC: pkovar, rvokal
Target Milestone: rcKeywords: Patch
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Prior to this update, there was a problem when entering a password using the pinentry-curses utility; an error message was displayed instead of the password entry dialog if pinentry-curses was run under a user different from the user who owned the current tty. This bug has been fixed in this update so that no error message is now displayed and pinentry-curses asks for a password as expected.
Story Points: ---
Clone Of:
: 677670 (view as bug list) Environment:
Last Closed: 2011-07-27 04:14:26 EDT Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Bug Depends On: 677670    
Bug Blocks:    
Attachments:
Description Flags
Patch fixing the bug none

Description Miroslav Vadkerti 2011-02-15 09:23:25 EST
Description of problem:
pinentry-ncurses fails if current tty is owned by different user
as the one running pinentry. This happens for example when users does "su -"
after logging in as normal user. The /dev/pts/XX file is not chown-ed to root
and therefore pinentry-ncurses fails

Version-Release number of selected component (if applicable):
pinentry-0.7.6-5.el6

How reproducible:
100%

Steps to Reproduce:
# ssh to a box as a normal user
# unset DISPLAY
# su -
# dd if=/dev/urandom of=testpartition bs=1M count=10
# losetup /dev/loop0 testpartition
# cryptsetup luksFormat /dev/loop0
(enter password)
# volume_key --save /dev/loop0 -o packet
  
Actual results:
volume_key: Error creating `packet': GPGME: Bad passphrase

Expected results:
No error and pinentry asks for password

Additional info:
Patch sent upstream by sochotni
Comment 1 Stanislav Ochotnicky 2011-02-15 09:26:46 EST
More simple reproducer is this:
1. login as normal user
2. unset DISPLAY # to use curses 
3. su -
4. gpg2 --symmetric .bashrc
Comment 2 Stanislav Ochotnicky 2011-02-15 09:29:28 EST
Created attachment 478883 [details]
Patch fixing the bug

This is patch that was sent upstream. Will be back after I hear back from them
Comment 3 RHEL Product and Program Management 2011-02-15 09:37:57 EST
This request was evaluated by Red Hat Product Management for
inclusion in the current release of Red Hat Enterprise Linux.
Because the affected component is not scheduled to be updated
in the current release, Red Hat is unfortunately unable to
address this request at this time. Red Hat invites you to
ask your support representative to propose this request, if
appropriate and relevant, in the next release of Red Hat
Enterprise Linux. If you would like it considered as an
exception in the current release, please ask your support
representative.
Comment 4 Stanislav Ochotnicky 2011-04-19 04:02:04 EDT
Additional information from upstream: capabilities are not supported for a long time, they were surprised it worked and that it was enabled by default in their configuration. They will be turning it off for next release. Testing on Fedoras suggests no problems when package was configured with --without-libcap.
Comment 5 Petr Kovar 2011-07-04 12:58:49 EDT
    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Prior to this update, there was a problem when entering a password using the pinentry-curses utility; an error message was displayed instead of the password entry dialog if pinentry-curses was run under a user different from the user who owned the current tty. This bug has been fixed in this update so that no error message is now displayed and pinentry-curses asks for a password as expected.
Comment 8 errata-xmlrpc 2011-07-27 04:14:26 EDT
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2011-1096.html