This bug originally affected oneiric, and also affects precise. It has
been fixed in upstream and is currently in quantal. This patch does NOT
apply to lucid. I have added my bzr branch of the package with the fixes
in this bug so that they can be merged as an SRU. Thanks
** Also affects: nss-pam-ldapd (Ubuntu Precise)
Importance: Undecided
Status: New
** Tags added: oneiric precise
** Changed in: nss-pam-ldapd (Ubuntu Precise)
Assignee: (unassigned) => Chris J Arges (christopherarges)
** Changed in: nss-pam-ldapd (Ubuntu Oneiric)
Importance: Undecided => Medium
** Changed in: nss-pam-ldapd (Ubuntu Precise)
Importance: Undecided => Medium
** Changed in: nss-pam-ldapd (Ubuntu Oneiric)
Status: New => In Progress
** Changed in: nss-pam-ldapd (Ubuntu Precise)
Status: New => In Progress
** Branch linked: lp:~christopherarges/ubuntu/oneiric/nss-pam-ldapd/nss-
pam-ldapd
** Branch linked: lp:~christopherarges/ubuntu/precise/nss-pam-ldapd/nss-
pam-ldapd
** Description changed:
- Linux clients that use ldap authentication with nslcd and a long
- pam_authz_search filter will see authentication fail silently
+ [Impact]
+ Linux clients that use ldap authentication with nslcd and a long
pam_authz_search filter will see authentication fail silently
$ lsb_release -rd
Description: Ubuntu 11.10
Release: 11.10
version:
nss-pam-ldapd-0.7.13
expected:
- Logging to indicate that the max filter length had been exceeded.
+ Logging to indicate that the max filter length had been exceeded.
actual:
authentication fails silently
workaround:
Increase max filter length. char_filter_buffer in pam.c can be increased to
4096 bytes allowing for a longer search filter
+ [Test Case]
reproduction steps:
modify entry for 127.0.1.1 in /etc/hosts so the example.com dc is used by
slapd
EX:
x.x.x.x server1
change to:
x.x.x.x server1.example.com server1
apt-get install nslcd # set search base "dc=example,dc=com". then select all
for services use ldap lookups when configuring libnss-ldapd.
apt-get install slapd
dpkg-reconfigure slapd # dns name "example.com"
apt-get install migrationtools
turn on ldap authentication using pam-auth-update
stop nslcd and slapd. We'll start them in debug mode
/etc/init.d/nslcd stop
/etc/init.d/slapd stop
migrate users to ldap. edit /etc/migrationtools/migrate_common.ph and change:
$DEFAULT_MAIL_DOMAIN = "example.com";
$DEFAULT_BASE = "dc=example,dc=com";
then run commands to create ldif exports of group and passwd
/usr/share/migrationtools/migrate_group.pl /etc/group ~/group.ldif
/usr/share/migrationtools/migrate_passwd.pl /etc/passwd ~/passwd.ldif
edit ~/people_group.ldif adding contents:
dn: ou=People, dc=example, dc=com
ou: People
objectclass: organizationalUnit
dn: ou=Group, dc=example, dc=com
ou: Group
objectclass: organizationalUnit
import data into ldap:
ldapadd -x -W -D "cn=admin,dc=example,dc=com" -f ~/people_group.ldif
ldapadd -x -W -D "cn=admin,dc=example,dc=com" -f ~/group.ldif
ldapadd -x -W -D "cn=admin,dc=example,dc=com" -f ~/passwd.ldif
edit /etc/nslcd.conf adding pam_authz_search filter
pam_authz_search
(&(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount)(objectClass=posixAccount))
open 2 new terminals and become root
in one terminal run nslcd in debug mode:
nslcd -d
in second terminal run slapd in debug mode:
slapd -d -1
in your original terminal attempt to sudo to a user other than root and
watch the debug output in the slapd and nslcd terminals:
sudo su ubuntu
look for output in nslcd terminal "DEBUG: trying pam_authz_search" in
nslcd terminal indicating filter is being used
increase search string beyond 1024 buffer and note that we're no longer
seeing "Trying pam_authz_search" in the nslcd output and that
authentication fails silently
+
+ [Regression Potential]
+ This just increases the buffer size from 1024 to 4096, it is already applied
in Quantal, and this SRU simply increases this buffer size.
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https://bugs.launchpad.net/bugs/951343
Title:
authentication fails silently with long pam_authz_search filter
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