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Description of problem:
Sudo denies access when the LDAP server is offline and entry_cache_timeout is expired. Additionally, the response time in this case is very long.

Version-Release number of selected component (if applicable):
sssd-1.9.2-21.el6.x86_64
sssd-client-1.9.2-21.el6.x86_64
libsss_idmap-1.9.2-21.el6.x86_64
sudo-1.8.6p3-5.el6.x86_64
libsss_sudo-1.9.2-21.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1. Use the attached LDIF file to fill LDAP directory.
2. Use the attached sssd.conf as the base for SSSD configuration.
3. Execute the following as root:
su -c 'sudo -u user2 true' user1 && echo allowed || echo denied
iptables -I OUTPUT -d server.sss-test.test -p tcp --dport ldaps -j REJECT --reject-with icmp-host-unreachable
su -c 'sudo -u user2 true' user1 && echo allowed || echo denied
  
Actual results:
allowed
sudo: no tty present and no askpass program specified
denied

Expected results:
allowed
allowed

Additional info:
The online request takes about 1.5 seconds. The offline request takes about two minutes. Considering that "host unreacheable" response is received immediately that is a very long overall response time.

Created attachment 654998 [details]
Base LDIF file

Created attachment 655001 [details]
sssd.conf

Created attachment 655002 [details]
sssd_LDAP.log

Created attachment 655004 [details]
sssd_sudo.log

Upstream ticket:
https://fedorahosted.org/sssd/ticket/1682

Verified fixed with the following packages:

sssd-client-1.9.2-41.el6.x86_64
libsss_idmap-1.9.2-41.el6.x86_64
libsss_sudo-1.9.2-41.el6.x86_64
sudo-1.8.6p3-6.el6.x86_64
sssd-1.9.2-41.el6.x86_64

Corresponding sudo suite output:

:: [   PASS   ] :: offline_allowed
:: [   PASS   ] :: offline_denied

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-2013-0508.html