[Freeipa-users] IPA HBAC access using SSSD for user in trusted AD domain (RHEL 6.8)

[Sullivan, Daniel [AAA]]

Hi,

I am experiencing an HBAC issue that is proving to be very difficult to diagnose.  It appears very closely related to the issue described in this thread (https://lists.fedorahosted.org/archives/list/sssd-users@lists.fedorahosted.org/thread/DTX4LP5VI2AHANMT4QFXERCN7US2TCUB/), except that clearing the cache does not fix the problem.  I am further stumped by the fact that I have an additional machine that was deployed from an identical VMWare template image which IPA HBAC works correctly on.  From a client perspective I am working with a fully updated version of RHEL 6.8 with ipa-client 3.0.0-50.el6.1 and sssd 1.13.3-22.el6.  We have a domain with 2 IPA domain controllers (RHEL 7.2 and ipa-server 4.2.0-15.el7_2.6.1); I have since shut down one of the two domain controllers and cleared the cache (/var/lib/sssd/db/*) on both clients and restarted sssd (to isolate a potential replication problem between DCs); the HBAC rule validates correctly on the only remaining DC (basically an any any rule). HBAC (the ability to login via sshd) continues to work on only one of the two clients.

>From what I can tell, both clients have the same version of all ipa-client and sssd (and presumably related packages as both clients are fully updated). I have compared their /etc/sshd/sshd_config, /etc/sssd/sssd.conf and all configurations in /etc/pam.d and both systems appear consistent.

I feel that it is worthwhile to mention that I believe that one of the two machines in question (the one that is not working) was bound as a CentrifyDC client.  We are planning on replacing CentrifyDC with FreeIPA (for several reasons), so it is important that we are able to take an existing CentrifyDC client, unbind it, uninstall the CentrifyDC package(s), and install FreeIPA in its place.  Regardless of whether CentrifyDC was previously installed, I feel that my somewhat thorough examination of /etc/sshd/sshd_config and the contents of /etc/pam.d would negate any potential residual configuration from Centrify that would cause this sort of problem.  I have posted my domain log here: http://pastebin.com/41KeSnq4

It is also probably worthwhile to mention that I am authenticating as a user in a trusted domain, although I believe this should be apparent in the the pastebin.

I am hoping that a subject matter expert in IPA and or SSSD would be able to help me further diagnose the access denied by HBAC entry that is present in the pastebin specified above.  As I said, I have cleared /var/lib/sss/db/* and reinstalled IPA-client several times.  I have also rebooted the system completely.

Thank you for considering helping me; I appreciate your time and expertise.

Best,

Dan




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