Bug 801377

Summary:	getent returns non-existing netgroup name, when sssd is configured as proxy provider
Product:	Red Hat Enterprise Linux 6	Reporter:	Amith <apeetham>
Component:	sssd	Assignee:	Stephen Gallagher <sgallagh>
Status:	CLOSED ERRATA	QA Contact:	IDM QE LIST <seceng-idm-qe-list>
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	6.3	CC:	grajaiya, jgalipea, jhrozek, prc
Target Milestone:	rc	Keywords:	Regression
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	sssd-1.8.0-12.el6	Doc Type:	Bug Fix
Doc Text:	No documentation needed	Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-06-20 11:55:43 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Amith 2012-03-08 12:00:04 UTC

Description of problem:
Upon requesting a non-existing netgroup name, the command #getent netgroup <unknown_group> returns the same name, however the command is expected to return nothing. This happens when sssd is configured as proxy provider. 

Version-Release number of selected component (if applicable):
sssd-1.8.0-11.el6.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Edit /etc/ldap.conf and add the following:
   uri ldap://<hostname.com>:<port>
   ssl no
   base <basedn> 

2. Create and edit /etc/pam.d/sssdproxyldap with the following contents:
   auth          required      pam_ldap.so
   account       required      pam_ldap.so
   password      required      pam_ldap.so
   session       required      pam_ldap.so

3. To produce the issue, setup sssd.conf as below:
[sssd]
reconnection_retries = 3
config_file_version = 2
sbus_timeout = 30
services = nss, pam
domains = PROXY
debug_level = 9

[nss]
filter_groups = root
filter_users = root

[pam]

[domain/PROXY]
id_provider = proxy
auth_provider = proxy
cache_credentials = TRUE
proxy_lib_name = ldap
proxy_pam_target = sssdproxyldap
enumerate = TRUE
debug_level = 9
ldap_tls_cacertdir = /etc/openldap/cacerts/
  
4. After setting the above configurations, start sssd service and run the following step:

[root@sssd-client sssd]# getent netgroup some_group

Actual results: 
The cmd #getent returns the non-existing netgroup name as given below:

[root@sssd-client sssd]# getent netgroup some_group
some_group

[root@sssd-client sssd]# getent netgroup some_group
some_group

Expected results:
The cmd #getent should return nothing upon requesting a non-existing netgroup.

[root@sssd-client sssd]# getent netgroup some_group
[root@sssd-client sssd]# getent netgroup some_group

Additional info:

Comment 2 Stephen Gallagher 2012-03-08 12:34:07 UTC

Upstream ticket:
https://fedorahosted.org/sssd/ticket/1242

Comment 7 Jakub Hrozek 2012-04-03 18:30:16 UTC

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
No documentation needed

Comment 8 Amith 2012-04-11 10:48:06 UTC

Verified on sssd-1.8.0-22.el6.x86_64. 

The fix involves modifying "proxy_lib_name = ldap" to "proxy_lib_name = file" (file: /etc/netgroup) due to a bug in nss-pam-ldapd, which outputs an empty netgroup even if it actually does not exist. Jakub has filed
https://bugzilla.redhat.com/show_bug.cgi?id=804103 against nss-pam-ldapd.

The output for the associated beaker automation script is given below:

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: [   LOG    ] :: Verify BZ release ticket #363 :- getent returns non-existing netgroup name with proxy provider when proxy_lib_name = file
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

:: [   PASS   ] :: Once - Verifying valid netgroup: QAeng
:: [   PASS   ] :: Twice - Verifying valid netgroup: QAeng
:: [   PASS   ] :: Thrice - Verifying valid netgroup: QAeng
:: [   PASS   ] :: Once - Verifying unknown netgroup: testsumgroup
:: [   PASS   ] :: Twice - Verifying unknown netgroup: testsumgroup
:: [   PASS   ] :: Thrice - Verifying unknown netgroup: testsumgroup
:: [   LOG    ] :: Duration: 4s
:: [   LOG    ] :: Assertions: 9 good, 0 bad
:: [   PASS   ] :: RESULT: Verify BZ release ticket #363 :- getent returns non-existing netgroup name with proxy provider when proxy_lib_name = file

Comment 10 errata-xmlrpc 2012-06-20 11:55:43 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-2012-0747.html