[Freeipa-users] 4.1.0: Logon issue after upgrading IPA

[Jakub Hrozek]

> On 16 Mar 2015, at 22:03, Andreas Skarmutsos Lindh <andreas at superblock.se> wrote:
> 
> Hi everyone,
> 
> After upgrading (using rpm, yum upgrade) I can no longer login to my machines using ssh. Before the upgrade everything was working fine.
> 
> Some loose facts:
> - I'm installing IPA packages from the RHEL repositories onto RHEL systems, so I'm not sure if this is the right mailing list to ask for assistance
> - I have a basic setup of IPA with minimum rules (deleted HBAC rules to single that out), using SSSD+PAM.
> - Both other machines that are upgraded to a more recent version of sssd and it's fellow packages and servers which was not yum upgraded are affected by the issue, thus, everything seems to point at IPA.
> - I'm able to obtain a kerberos ticket via kinit
> - Running the following package version: ipa-server-4.1.0-18.el7.x86_64
> 
> SSH returns (adding -vvv hardly tells me anything useful):
> Connection closed by UNKNOWN
> 
> I think that I have boiled down the issue to the following..
> Both clients with upgraded sssd (1.12.2-58) and non upgraded clients (1.11.2-65) give me the following output in sssd_<domain>.log:
> (Mon Mar 16 14:12:17 2015) [sssd[be[domain.com]]] [hbac_eval_user_element] (0x0080): Parse error on [cn=Modify PassSync Managers Configuration+nsuniqueid=21e13243-cbd011e4-ba3a9b82-0e1e4aae,cn=permissions,cn=pbac,dc=domain,dc=com]
> (Mon Mar 16 14:12:17 2015) [sssd[be[domain.com]]] [hbac_ctx_to_rules] (0x0020): Could not construct eval request
> (Mon Mar 16 14:12:17 2015) [sssd[be[domain.com]]] [ipa_hbac_evaluate_rules] (0x0020): Could not construct HBAC rules
> (Mon Mar 16 14:12:17 2015) [sssd[be[domain.com]]] [be_pam_handler_callback] (0x0100): Backend returned: (3, 4, <NULL>) [Internal Error (System error)]
> (Mon Mar 16 14:12:17 2015) [sssd[be[domain.com]]] [be_pam_handler_callback] (0x0100): Sending result [4][domain.com]
> (Mon Mar 16 14:12:17 2015) [sssd[be[domain.com]]] [be_pam_handler_callback] (0x0100): Sent result [4][domain.com]
> (Mon Mar 16 14:12:17 2015) [sssd[be[domain.com]]] [sdap_process_result] (0x2000): Trace: sh[0x7f5711099220], connected[1], ops[(nil)], ldap[0x7f571108d0e0]
> (Mon Mar 16 14:12:17 2015) [sssd[be[domain.com]]] [sdap_process_result] (0x2000): Trace: ldap_result found nothing!
> 

This is a combination of a broken replication on the server side and too strict SSSD processing which can't handle unexpected entries. The broken replication has yielded entries like:
	cn=Modify PassSync Managers Configuration+nsuniqueid=21e13243-cbd011e4-ba3a9b82-0e1e4aae,cn=permissions,cn=pbac,dc=domain,dc=com]
note the nsUniqueID. As I learned today, entries with nsUniqueID in the RDN are relicts of broken replication.

Dan Lavu (CC) has helped another setup with the same symtoms recently, maybe he can help here as well?

The SSSD should just skip malformed entries if no DENY rules are used. That is tracked by SSSD ticket #2603. I have local patches for that one and I'll send them out to the list tomorrow.

> I'm happy to attach more logs if needed.
> I would very much like to avoid rolling back to an older IPA version by reinstalling everything from scratch.
> Any and all help would be very much appreciated.
> 
> Thanks in advance,
> Andreas
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