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Description of problem:
sudo denies access when ldap_sudo_use_host_filter is disabled. Also, it seems the "defaults" entry is ignored.

Version-Release number of selected component (if applicable):
sssd-client-1.9.2-34.el6.x86_64
sudo-1.8.6p3-6.el6.x86_64
libsss_idmap-1.9.2-34.el6.x86_64
sssd-1.9.2-34.el6.x86_64
libsss_sudo-1.9.2-34.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1. Use the attached "sudo_host_filter_test.ldif" file to fill LDAP directory.
2. Use the attached "sssd.conf" file as the base for SSSD configuration.
3. Execute "su -c 'sudo -u user2 true' user1 && echo allowed || echo denied" as root.
  
Actual results:
sudo: no tty present and no askpass program specified
denied

Expected results:
allowed

Created attachment 659393 [details]
sudo_host_filter_test.ldif

Created attachment 659394 [details]
sssd.conf

Created attachment 659395 [details]
sssd_LDAP.log

Created attachment 659396 [details]
sssd_sudo.log

Upstream ticket:
https://fedorahosted.org/sssd/ticket/1701

Verified fixed with the following packages:

sssd-1.9.2-45.el6.x86_64
sssd-client-1.9.2-45.el6.x86_64
sudo-1.8.6p3-6.el6.x86_64
libsss_idmap-1.9.2-45.el6.x86_64
libsss_sudo-1.9.2-45.el6.x86_64

Relevant sudo suite output:

:: [   PASS   ] :: host_filter_off

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