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Bug 1259846 - KDC does not return proper client principal for client referrals
Summary: KDC does not return proper client principal for client referrals
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: krb5
Version: 7.2
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Robbie Harwood
QA Contact: Patrik Kis
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2015-09-03 15:34 UTC by Alexander Bokovoy
Modified: 2015-11-19 05:14 UTC (History)
8 users (show)

Fixed In Version: krb5-1.13.2-10.el7
Doc Type: Bug Fix
Doc Text:
Clone Of: 1259844
Environment:
Last Closed: 2015-11-19 05:14:36 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
proposed backport patch (1.04 KB, patch)
2015-09-03 15:35 UTC, Alexander Bokovoy 		no flags Details | Diff
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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:2154 0 normal SHIPPED_LIVE Moderate: krb5 security, bug fix, and enhancement update 2015-11-19 08:16:22 UTC

Description Alexander Bokovoy 2015-09-03 15:34:54 UTC 
+++ This bug was initially created as a clone of Bug #1259844 +++

Description of problem:
When working on support for client referrals from trusted domains in FreeIPA I've found a bug in MIT Kerberos KDC that prevents it from returning correct trusted domain realm for client referral.

The reason for this bug is that prepare_error_as_req() uses KDC-specific table error code to check if wrong realm is reported rather than a protocol error code.

The fix upstream that removes need to consider error codes in prepare_error_as_req() is proposed at https://github.com/krb5/krb5/pull/323/

Attached is the minimal backport suggested by Simo that is essentially s/KRB5KDC_ERR_WRONG_REALM/KDC_ERR_WRONG_REALM/ in prepare_error_as_req() to reduce scope of backport.

According to Greg Hudson the bug exists since MIT Kerberos 1.7.
Comment 2 Alexander Bokovoy 2015-09-03 15:35:36 UTC 
Created attachment 1069931 [details]
proposed backport patch
Comment 3 Patrik Kis 2015-09-04 08:01:20 UTC 
Can you add reproducer please that can be used to verify the bug fix? Thanks.
Comment 4 Alexander Bokovoy 2015-09-04 09:38:34 UTC 
Greg has a patch with test cases: https://github.com/greghudson/krb5/commit/573f37ebda20e185929d9a6bf4b884fa322c9512
Comment 5 Patrik Kis 2015-09-04 09:50:07 UTC 
(In reply to Alexander Bokovoy from comment #4)
> Greg has a patch with test cases:
> https://github.com/greghudson/krb5/commit/
> 573f37ebda20e185929d9a6bf4b884fa322c9512

Thanks Alexander,
I should have checked that first.

@Robbie,
please make sure that the fix includes the test too. Thanks.
Comment 17 errata-xmlrpc 2015-11-19 05:14:36 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/RHSA-2015-2154.html
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