[Freeipa-users] Help with debugging HBACs

[Andrew Egelhofer]

Hi FreeIPA Users-

I've deployed a FreeIPA instance in my Lab, and enrolled a single host, and
a single user ('testuser'). The only HBAC rule I currently have is the
stock allow_all. Yet, when I attempt to log into the host via ssh, it
closes the connection.

$ ssh testuser@<host>
Warning: Permanently added '<host>,<host-ip>' (RSA) to the list of known
hosts.
testuser@<host>'s password:
Connection closed by <host-ip>

The host I'm attempting to login to can correctly look up the user using
getent:

# getent passwd testuser
testuser:*:168400003:168400003:Test User:/home/testuser:/bin/bash

Scanning /var/log/secure, I see these entries:

Feb 14 12:01:50 <host> sshd[6528]: pam_unix(sshd:auth): authentication
failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=172.30.3.58
 user=testuser
Feb 14 12:01:51 <host> sshd[6528]: pam_sss(sshd:auth): authentication
success; logname= uid=0 euid=0 tty=ssh ruser=
rhost=172.30.3.58 user=testuser
Feb 14 12:01:51 <host> sshd[6528]: pam_sss(sshd:account): Access denied for
user testuser: 6 (Permission denied)

That tells me (From reading online) the user / password was correctly
authenticated, but failed authorization due to HBAC rules. I've tested the
rule using the 'hbactest' utility and it passes

[root@<Master> ~]# ipa hbactest --user=testuser --host=<host> --service=sshd
--------------------
Access granted: True
--------------------
  Matched rules: allow_all

I'm at a loss here, because If I comment out the line:

account     [default=bad success=ok user_unknown=ignore] pam_sss.so

in /etc/pam.d/system-auth, the user is able to login.

So what am I missing here? Is there a way I can debug HBAC rules? I've
already set debug_level = 10 in /etc/sssd/sssd.conf, and I see its able to
access the HBAC 'allow_all' rule in the log /var/log/sssd/sssd_<domain>.<dc>
.log:

(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[sdap_get_generic_done] (7): Total count [0]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]] [hbac_attrs_to_rule]
(7): Processing rule [allow_all]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_user_attrs_to_rule] (7): Processing users for rule [allow_all]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]] [hbac_get_category]
(5): Category is set to 'all'.
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_service_attrs_to_rule] (7): Processing PAM services for rule
[allow_all]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]] [hbac_get_category]
(5): Category is set to 'all'.
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_thost_attrs_to_rule] (7): Processing target hosts for rule [allow_all]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]] [hbac_get_category]
(5): Category is set to 'all'.
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_shost_attrs_to_rule] (7): Processing source hosts for rule [allow_all]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_host_attrs_to_rule] (4): No host specified, rule will never apply.
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_eval_user_element] (7): [12] groups for [admin]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_eval_user_element] (7): Added group [admins] for user [admin]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_eval_user_element] (8): Skipping non-group memberOf [cn=replication
administrators,cn=privileges,cn=pbac,dc=<domain>,dc=<dc>]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_eval_user_element] (8): Skipping non-group memberOf [cn=add
replication agreements,cn=permissions,cn=pbac,dc=<domain>,dc=<dc>]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_eval_user_element] (8): Skipping non-group memberOf [cn=modify
replication agreements,cn=permissions,cn=pbac,dc=<domain>,dc=<dc>]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_eval_user_element] (8): Skipping non-group memberOf [cn=remove
replication agreements,cn=permissions,cn=pbac,dc=<domain>,dc=<dc>]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_eval_user_element] (8): Skipping non-group memberOf [cn=host
enrollment,cn=privileges,cn=pbac,dc=<domain>,dc=<dc>]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_eval_user_element] (8): Skipping non-group memberOf [cn=manage host
keytab,cn=permissions,cn=pbac,dc=<domain>,dc=<dc>]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_eval_user_element] (8): Skipping non-group memberOf [cn=enroll a
host,cn=permissions,cn=pbac,dc=<domain>,dc=<dc>]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_eval_user_element] (8): Skipping non-group memberOf [cn=add
krbprincipalname to a host,cn=permissions,cn=pbac,dc=<domain>,dc=<dc>]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_eval_user_element] (8): Skipping non-group memberOf [cn=unlock user
accounts,cn=permissions,cn=pbac,dc=<domain>,dc=<dc>]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_eval_user_element] (8): Skipping non-group memberOf [cn=manage
service keytab,cn=permissions,cn=pbac,dc=<domain>,dc=<dc>]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[hbac_eval_user_element] (7): Added group [trust admins] for user [admin]
(Fri Feb 13 21:38:15 2015) [sssd[be[<domain>.<dc>]]]
[ipa_hbac_evaluate_rules] (3): Access denied by HBAC rules

IPA server:
# rpm -q ipa-server sssd
ipa-server-3.0.0-42.el6.centos.x86_64
sssd-1.11.6-30.el6_6.3.x86_64
# cat /etc/redhat-release
CentOS release 6.5 (Final)

Client:
# cat /etc/redhat-release
CentOS release 5.8 (Final)
# rpm -q sssd
sssd-1.5.1-49.el5_8.1

Any help is appreciated.

Thanks,
-Andrew
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