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Bug 878462 - Special case NFS related ticket to avoid attaching MS-PACs
Summary: Special case NFS related ticket to avoid attaching MS-PACs
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: ipa
Version: 6.4
Hardware: Unspecified
OS: Unspecified
medium
unspecified
Target Milestone: rc
: ---
Assignee: Rob Crittenden
QA Contact: Namita Soman
URL:
Whiteboard:
Depends On:
Blocks: 886216
TreeView+ depends on / blocked
 
Reported: 2012-11-20 13:44 UTC by Dmitri Pal
Modified: 2013-02-21 09:30 UTC (History)
6 users (show)

Fixed In Version: ipa-3.0.0-10.el6
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-02-21 09:30:21 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2013:0528 0 normal SHIPPED_LIVE Low: ipa security, bug fix and enhancement update 2013-02-21 08:22:21 UTC

Description Dmitri Pal 2012-11-20 13:44:50 UTC 
This bug is created as a clone of upstream ticket:
https://fedorahosted.org/freeipa/ticket/3263

The current Linux NFS server is severely limited when it comes to handling kerberos tickets. Bsically any ticket bigger than 2k will cause it to fail authentication due to kernel->userspace upcall interface restrictions.

Until we have additional support in IPA to indivdually mark principals to opt out of getting PACs attached we always prevent PACs from being attached to TGTs or Tickets where NFS is involved.
Comment 1 Namita Soman 2012-11-20 19:24:02 UTC 
Please provide steps to reproduce and verify this
Comment 2 Simo Sorce 2012-11-20 20:25:32 UTC 
- Create new Ad user
- try to mount export from a NFS server member of IPA domain, see that it succeeds using GSSAPI/Krb5 auth as that user.
- unmount
- logout
- Add AD user to 500 groups
- log in again
- try to mount expot from  NFS server, see authentication failure
Comment 3 Rob Crittenden 2012-11-30 21:32:57 UTC 
Fixed upstream.

master: 5269458f552380759c86018cd1f30b64761be92e

ipa-3-0: 592dd9fccd1696bff5e604c6097b2a8785add295
Comment 6 Steeve Goveas 2013-02-05 14:41:03 UTC 
[root@rasalghul ~]# exportfs -v
/nfs-share    	<world>(rw,wdelay,root_squash,no_subtree_check,sec=krb5:krb5i:krb5p,rw,root_squash,no_all_squash)

C:\Users\fuser>mount \\rasalghul.testrelm.com\nfs-share *
Z: is now successfully connected to \\rasalghul.testrelm.com\nfs-share

The command completed successfully.

C:\Users\fuser>z:

Z:\>dir
 Volume in drive Z has no label.
 Volume Serial Number is A3CD-75CC

 Directory of Z:\

02/05/2013  01:33 PM    <DIR>          .
02/05/2013  01:33 PM                 0 file2
02/05/2013  01:33 PM                 0 file1
02/05/2013  01:33 PM    <DIR>          ..
               2 File(s)          8,192 bytes
               2 Dir(s)   3,941,351,424 bytes free


* Unmount and Logout

C:\Users\fuser>umount -a
You have these active NFS connections:

Z:      \\rasalghul.testrelm.com\nfs-share
Continuing will cancel the connections.

Do you want to continue this operation? (Y/N) [N]:y

Disconnecting           Z:      \\rasalghul.testrelm.com\nfs-share
The command completed successfully.


* Added User to 500 groups. Mount works as expected

C:\Users\fuser>mount \\rasalghul.testrelm.com\nfs-share *
Z: is now successfully connected to \\rasalghul.testrelm.com\nfs-share

The command completed successfully.


* Credential Cache increased a small amount for nfs ticket indicating that there is no PAC attached.

[root@wazwan ~]# kdestroy 

[root@wazwan ~]# ll -h /tmp/k*
ls: cannot access /tmp/k*: No such file or directory

[root@wazwan ~]# kinit fuser
Password for fuser: 

[root@wazwan ~]# ll -h /tmp/k*
-rw-------. 1 root root 5.1K Feb  5 19:33 /tmp/krb5cc_0

[root@wazwan ~]# kvno ldap/wazwan.testrelm.com
ldap/wazwan.testrelm.com: kvno = 2

[root@wazwan ~]# ll  /tmp/k*
-rw-------. 1 root root 15440 Feb  5 19:34 /tmp/krb5cc_0

[root@wazwan ~]# kvno nfs/wazwan.testrelm.com
nfs/wazwan.testrelm.com: kvno = 1

[root@wazwan ~]# ll  /tmp/k*
-rw-------. 1 root root 15967 Feb  5 19:34 /tmp/krb5cc_0
Comment 8 errata-xmlrpc 2013-02-21 09:30:21 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/RHSA-2013-0528.html
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