RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1057333 - authenticate_gss_client_wrap() fails to wrap username correctly
Summary: authenticate_gss_client_wrap() fails to wrap username correctly
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: python-kerberos
Version: 6.4
Hardware: All
OS: Linux
medium
urgent
Target Milestone: rc
: ---
Assignee: Rob Crittenden
QA Contact: Namita Soman
URL:
Whiteboard:
Depends On:
Blocks: 1057338 1061410 1112373
TreeView+ depends on / blocked
 
Reported: 2014-01-23 20:37 UTC by A. Jesse Jiryu Davis
Modified: 2014-10-14 08:27 UTC (History)
0 users

Fixed In Version: python-kerberos-1.1-7.el6
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 1057338 1112373 (view as bug list)
Environment:
Last Closed: 2014-10-14 08:27:34 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
demonstration program (1.07 KB, text/x-python)
2014-02-11 20:30 UTC, Rob Crittenden 		no flags Details
View All


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2014:1600 0 normal SHIPPED_LIVE python-kerberos bug fix update 2014-10-14 01:39:43 UTC

Description A. Jesse Jiryu Davis 2014-01-23 20:37:37 UTC 
Description of problem:

python-kerberos 1.1 includes an off-by-one bug, with the result that it incorrectly encodes the Kerberos username into a GSSAPI message and authentication always fails. The bug was reported and fixed upstream:

http://trac.calendarserver.org/ticket/355

Version-Release number of selected component (if applicable):

1.1

How reproducible:

Always.

Additional info:

Remove the " + 1" from the end of line 358 in python-kerberos-1.1/src/kerberosgss.c and rebuild python-kerberos. Authentication now succeeds. This is the fix to issue 355 upstream:

http://trac.calendarserver.org/ticket/355

http://trac.calendarserver.org/changeset?reponame=&new=4895%40PyKerberos%2Ftrunk&old=4241%40PyKerberos%2Ftrunk
Comment 2 A. Jesse Jiryu Davis 2014-01-23 20:58:49 UTC 
Discovered via this PyMongo bug report:

https://jira.mongodb.org/browse/PYTHON-626
Comment 3 Rob Crittenden 2014-02-11 20:30:41 UTC 
Created attachment 861987 [details]
demonstration program

You need a Kerberos server to test against. I tested with IPA using this:

# ipa-server-install ...
# kinit admin
# ipa service-add test/`hostname` --force
# ipa-getkeytab -s `hostname` -p test/`hostname` -k test.keytab
# export KRB5_KTNAME=`pwd`/test.keytab
# python wrap.py 

Prior to the fix the response is `admin\x00' and with the fix just 'admin' where EXAMPLE.COM is your Kerberos realm.
Comment 5 Namita Soman 2014-09-08 19:06:02 UTC 
Verified using ipa-server-3.0.0-42.el6.x86_64, python-kerberos-1.1-7.el6.x86_64

Took steps as recommended above:

# kinit admin
Password for admin:

# ipa service-add test/`hostname` --force
----------------------------------------------------------
Added service "test/idm-qe-03.testrelm.test"
----------------------------------------------------------
  Principal: test/idm-qe-03.testrelm.test
  Managed by: idm-qe-03.testrelm.test

# ipa-getkeytab -s `hostname` -p test/`hostname` -k test.keytab
Keytab successfully retrieved and stored in: test.keytab

# export KRB5_KTNAME=`pwd`/test.keytab

# vim wrap.py [Updated service = "test.test" ]

# python wrap.py
User 'admin'
Comment 6 errata-xmlrpc 2014-10-14 08:27:34 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2014-1600.html
Note You need to log in before you can comment on or make changes to this bug.