Bug 1259846 – KDC does not return proper client principal for client referrals

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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

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	krb5 (Show other bugs)
Sub Component:
Version:	7.2
Hardware:	Unspecified Unspecified

Priority	unspecified Severity unspecified
Target Milestone:	rc
Target Release:	---
Assigned To:	Robbie Harwood
QA Contact:	Patrik Kis
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2015-09-03 11:34 EDT by Alexander Bokovoy
Modified:	2015-11-19 00:14 EST (History)
CC List:	8 users (show)

See Also:
Fixed In Version:	krb5-1.13.2-10.el7
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:	1259844
Environment:
Last Closed:	2015-11-19 00:14:36 EST
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
proposed backport patch (1.04 KB, patch) 2015-09-03 11:35 EDT, Alexander Bokovoy	no flags	Details \| Diff
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2015:2154	normal	SHIPPED_LIVE	Moderate: krb5 security, bug fix, and enhancement update	2015-11-19 03:16:22 EST

Groups: None (edit)

Description Alexander Bokovoy 2015-09-03 11:34:54 EDT

+++ 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 11:35:36 EDT

Created attachment 1069931 [details]
proposed backport patch

Comment 3 Patrik Kis 2015-09-04 04:01:20 EDT

Can you add reproducer please that can be used to verify the bug fix? Thanks.

Comment 4 Alexander Bokovoy 2015-09-04 05:38:34 EDT

Greg has a patch with test cases: https://github.com/greghudson/krb5/commit/573f37ebda20e185929d9a6bf4b884fa322c9512

Comment 5 Patrik Kis 2015-09-04 05:50:07 EDT

(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 00:14:36 EST

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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