pam_permit is a PAM module that always permit access. It does nothing else.
In the case of authentication, the user's name will be set to nobody if the application didn't set one. Many applications and PAM modules become confused if this name is unknown.
This module is very dangerous. It should be used with extreme caution.
Add this line to your other login entries to disable account management, but continue to permit users to log in.
account required pam_permit.so