Bug 864950

Summary: Configure winbind_krb5_locator.so via alternatives to allow IPA AD trusts use - samba package
Product: Red Hat Enterprise Linux 6 Reporter: Alexander Bokovoy <abokovoy>
Component: sambaAssignee: Andreas Schneider <asn>
Status: CLOSED ERRATA QA Contact: qe-baseos-daemons
Severity: medium Docs Contact:
Priority: medium    
Version: 6.4CC: asn, azelinka, dpal, gdeschner, sbose, tlavigne
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: samba-3.6.9-151.el6 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: 864889 Environment:
Last Closed: 2013-02-21 08:45:20 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 864889    
Bug Blocks:    
Attachments:
Description Flags
patch to introduce alternatives for winbind_krb5_locator.so none

Description Alexander Bokovoy 2012-10-10 13:18:19 UTC 
+++ This bug was initially created as a clone of Bug #864889 +++

Description of problem:
On IPA server when AD trusts feature is enabled, winbind_krb5_locator.so plugin should not be available to libkrb5. This could be achieved by requiring that samba{,4}-winbind-krb5-locator package is never installed when ipa-server-trust-ad package is installed but much easier to automatically configure through alternatives.

Without this fix winbind_krb5_locator.so plugin to libkrb5 will interfere with winbindd configuration for IPA AD trusts, rendering them unusable.

--- Additional comment from pm-rhel on 2012-10-10 13:51:35 EEST ---

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 abokovoy on 2012-10-10 13:54:22 EEST ---

Created attachment 624780 [details]
patch to introduce alternatives for winbind_krb5_locator.so

This is spec change that is needed to allow disabling winbind_krb5_locator.so plugin when trusts are in use on the server. Since libkrb5 reads any file in its plugins directory, keeping disabled plugin there is not an option, so I moved it back to %_libdir and used alternatives instead.

When trusts package (ipa-server-trust-ad) is installed, it will alternate to /dev/null for this plugin (link in plugins dir will point to /etc/alternatives/winbind_krb5_locator.so which will point to /dev/null). This will make libkrb5 to effectively ignore the plugin.

When trusts package is uninstalled, samba4 package will automatically be selected as a provider for the winbind_krb5_locator.so and will redirect the link to %_libdir/winbind_krb5_locator.so which is happily used by libkrb5
Comment 1 Alexander Bokovoy 2012-10-10 13:20:09 UTC 
Created attachment 624869 [details]
patch to introduce alternatives for winbind_krb5_locator.so

Adopt patch from samba4 to samba package.
Comment 15 errata-xmlrpc 2013-02-21 08:45:20 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-2013-0338.html