PAM (Pluggable Authentication Modules)
From MoodleDocs
This method uses PAM to access the native usernames on this server. You have to install PHP4 PAM Authentication in order to use this module.
Note: You are currently viewing documentation for Moodle 3.1. Up-to-date documentation for the latest stable version of Moodle is probably available here: PAM (Pluggable Authentication Modules).
This method uses PAM to access the native usernames on this server. You have to install PHP4 PAM Authentication in order to use this module.