1

We installed ppolicy overlay on our ldap server. Password policies work correctly for locking out user after X incorrect password attempts, but we can't enforce user to change his password.

When we set pwdReset=TRUE attribute for a user - user can login as usual from Ubuntu client machine.

Ldap server & client were setup according to Ubuntu howto: https://help.ubuntu.com/12.10/serverguide/openldap-server.html

Client machine uses pam_ldap

Configuration file /etc/ldap.conf has "pam_lookup_policy yes" line

But pwdReset attribute is ignored.

According to what I read on the internet pam_ldap should honor ppolicy and require user to change his password when pwdReset is set. But it doesn't work for us..

How to make ubuntu client honor pwdReset attribute?

Maybe I can turn on debug logging for pam_ldap? But I can't find how to do it...

2

You must make sure that pwdMustChange is set to TRUE on the user's effective password policy.

See the slapo-ppolicy manpage for more information.

2

I ran into this as well -- my particular problem was that while some third-party applications (Okta in our case) looks for pwdReset, the pam_ldap plugin does not.

After taking a look at the source code for pam_ldap as hosted here: https://github.com/wfhu/pam_ldap -- I've come to the conclusion that pam_ldap completely ignores pwdReset which is part of OpenLDAP's ppolicy.schema. You can find the schema that OpenLDAP uses here: http://www.zytrax.com/books/ldap/ape/ppolicy.html

NOTE: I believe the problem is that the OpenLDAP policy attributes are different from the original schema that (Netscape?/UniversityOfMichigan?/Sun?) LDAP server implementation used, which is what pam_ldap expects.

What does work correctly is the shadow* attributes that are part of the shadowAccount objectClass.

[Steps are for Ubuntu]

  1. Make sure that your user(s) have a password policy set in LDAP by checking pwdPolicySubentry:

    ldapsearch (...) -b dc=example,dc=org "(uid=testinguser)" pwdPolicySubentry
    
  2. Check your user's shadow* information

    slapcat -a uid=testinguser
    
  3. Set shadowLastChange to 0 to allow pam_ldap to recognise an expired password

    This could be done via a script that checks for pwdReset and updates shadowLastChange.

When this is setup PAM will correctly force a user to change their password on login.

See also: http://www.openldap.org/lists/openldap-technical/201210/msg00044.html

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.