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How to configure ubuntu 12.04 as ldap client with pam modules?

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Posting your configuration file in your question would help! –  Jorge Castro Nov 8 '12 at 21:45

3 Answers 3

The contents of this post are based on this guide. It should work fine in 12.04.

1) Issue the following command:

sudo apt-get install ldap-utils libpam-ldap libnss-ldap nslcd

NOTE: During the installation of the above packages a dialog will pop up and ask about some LDAP configuration. Be sure to enter the correct values for your LDAP configuration.

2) Edit /etc/nsswitch.conf (via sudo). Append "ldap" to these lines:

#Original file looks like this 
passwd: compat 
group : compat  
shadow: compat 

#After appending "ldap" lines look like these
passwd: compat ldap
group : compat ldap  
shadow: compat ldap 

3) Comment out the line rootbinddn, I'm not sure why we need to do that.

4) Edit /etc/pam.d/login (via sudo) and paste:

session required pam_mkhomedir.so skel=/etc/skel umask=0022 

5) Edit /etc/pam.d/lightdm (via sudo) and paste:

session required pam_mkhomedir.so skel=/etc/skel umask=0022 

6) Issue this command:

sudo update-rc.d nslcd enable

You should be able to log in as an LDAP user after a reboot. If you don't reboot the machine, you must restart nscd with:

/etc/init.d/nscd restart

Likely problems and solutions:

  • Logging in as an LDAP user takes a very long time (minutes): It's very likely that nss-lap is having problems finding the user's group. Make sure that the user is in a group recognized locally, or that the user is in a group defined in LDAP. Make sure that, if the group is defined in LDAP, that it's a real POSIX group.
  • Always check the /var/log/auth.log log file. If you see "unable to contact ldap server", check whether the LDAP server is reachable and the port is open.
  • Try to ping the LDAP server by name
  • Try to check whether the LDAP port is open:
    • LDAP can listen on different ports, but can usually be found on 389 and 636
    • You can check that a port is open by using telnet:
    • telnet 389 or telnet 636
    • If you see any characters on the console then the port is open and the LDAP server should be running.
    • If you see nothing or get an error message, either the LDAP server is not running or something (such as a firewall) is preventing the connection.
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To get the home directory automatically created on login, I had to put the line:

session required pam_mkhomedir.so skel=/etc/skel umask=0022

into /etc/pam.d/common-session instead of /etc/pam.d/login - when I just had it in the later my home directory was not created.

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In order to have the option to type in usernames, you have to modify the lightdm configuration with the following command:

/usr/lib/lightdm/lightdm-set-defaults -m true
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