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Bug 1112373 - 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 7
Classification: Red Hat
Component: python-kerberos
Version: 7.0
Hardware: All
OS: Linux
medium
urgent
Target Milestone: rc
: ---
Assignee: Rob Crittenden
QA Contact: Namita Soman
URL:
Whiteboard:
Depends On: 1057333
Blocks: 1057338 1061410
TreeView+ depends on / blocked
 
Reported: 2014-06-23 18:49 UTC by Rob Crittenden
Modified: 2015-03-05 10:24 UTC (History)
1 user (show)

Fixed In Version: python-kerberos-1.1-14
Doc Type: Bug Fix
Doc Text:
Clone Of: 1057333
Environment:
Last Closed: 2015-03-05 10:24:54 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:0429 0 normal SHIPPED_LIVE python-kerberos bug fix and enhancement update 2015-03-05 14:53:30 UTC

Description Rob Crittenden 2014-06-23 18:49:22 UTC 
+++ This bug was initially created as a clone of Bug #1057333 +++

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

--- Additional comment from RHEL Product and Program Management on 2014-01-23 15:54:18 EST ---

Since this bug report was entered in bugzilla, the release flag has been
set to ? to ensure that it is properly evaluated for this release.

--- Additional comment from A. Jesse Jiryu Davis on 2014-01-23 15:58:49 EST ---

Discovered via this PyMongo bug report:

https://jira.mongodb.org/browse/PYTHON-626

--- Additional comment from Rob Crittenden on 2014-02-11 15:30:41 EST ---

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 2 Namita Soman 2015-01-23 15:16:59 UTC 
Verified using:
python-kerberos-1.1-15.el7.x86_64
ipa-server-4.1.0-15.el7.x86_64

Steps takes as listed in #comment1

# ipa service-add test1/`hostname` --force
----------------------------------------------------------
Added service "test1/qeblade6.testrelm.test"
----------------------------------------------------------
  Principal: test1/qeblade6.testrelm.test
  Managed by: qeblade6.testrelm.test


# ipa-getkeytab -s `hostname` -p test1/`hostname` -k test1.keytab
Keytab successfully retrieved and stored in: test1.keytab


# export KRB5_KTNAME=`pwd`/test1.keytab


downloaded wrap.py from bz1057333

# python wrap.py 
User 'admin'

verified the response is valid.
Comment 5 errata-xmlrpc 2015-03-05 10:24:54 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.

https://rhn.redhat.com/errata/RHBA-2015-0429.html
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