Hi My question probably straddles both PAM and LDAP so please scan it to the bottom before outrightly dismissing it as being mis-posted. I am not sure if this is by design but when I login as a user to a box with LDAP enabled I see a search request for every possible user in my dirctory. This breaks my test system if I have more than 10 000 users, while is unlikely that I would have so many users I would still like to optimize the LDAP query to be slightly less verbose.

I have added nss_base directive which I did not have to optimize the search but it has not had the desired effect I had hoped for, it has in fact added an additional 70 odd packets to the average network capture when a user authenticates.

my /etc/ldap.conf:

binddn uid=SysAuth,ou=Service Accounts,dc=mycompany bindpw secret pam_password clear base dc=betfair nss_base_passwd ou=people,dc=mycompany?sub nss_base_group ou=Groups,dc=mycompany?sub nss_base_group ou=PrivateGroups,dc=mycompany?sub nss_base_group ou=SystemGroups,dc=mycompany?sub

sizelimit 1000 idle_timelimit 5 timelimit 10 bind_timelimit 5 nss_reconnect_tries 1 nss_reconnect_maxconntries 1 nss_reconnect_sleeptime 1 nss_reconnect_maxsleeptime 1 nss_reconnect_maxconntries 1

I have also played around with various debug levels in /etc/ldap.conf but I have not really been succesfull in matching requests I see there to requests I see in wireshark. The man page in centos (man pam_ldap and nss_ldap ) also does not make any mention of available log levels or what they do. I have also scanned the source code for some more info on log levels but did not find anything usefull. If it is in the source code then please point me to it.

I have gone through the pam list logs and the closest I could find was a the following thread: https://www.redhat.com/archives/pam-list/2009-September/thread.html and a similar thread in December 2010. This threads although similar is related to groups and my problem is with every user being queried.

I am also

I am 90% certain that is a config error on my part but I have not been able to find that error yet and would welcome any assistance in finding the problem.

My system-auth in /etc/pam.d/ looks as follows:

auth required pam_env.so auth sufficient pam_unix.so nullok try_first_pass auth requisite pam_succeed_if.so uid >= 500 quiet auth sufficient pam_ldap.so use_first_pass auth required pam_deny.so

account required pam_access.so account required pam_unix.so broken_shadow account sufficient pam_localuser.so account sufficient pam_succeed_if.so uid < 500 quiet account [default=bad success=ok user_unknown=ignore] pam_ldap.so debug account required pam_permit.so

password requisite pam_cracklib.so try_first_pass retry=3 password sufficient pam_unix.so nullok try_first_pass use_authtok password sufficient pam_ldap.so use_authtok password required pam_deny.so

session optional pam_keyinit.so revoke session required pam_limits.so session optional pam_mkhomedir.so session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid session required pam_unix.so session optional pam_ldap.so

Using CentOS release 5.4

Best Regards

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