C:/xampp/htdocs/moodle/auth/pam/auth.php

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<?php

if (!defined('MOODLE_INTERNAL')) {
    die('Direct access to this script is forbidden.');    
}

require_once($CFG->libdir.'/authlib.php');

class auth_plugin_pam extends auth_plugin_base {

    var $lasterror;

    function auth_plugin_pam() {
        $this->authtype = 'pam';
        $this->config = get_config('auth/pam');
        $this->errormessage = '';
    }

    function user_login ($username, $password) {
        // variable to store possible errors during authentication
        $errormessage = str_repeat(' ', 2048);

        // just for testing and debugging
        // error_reporting(E_ALL);

        // call_time_pass_reference of errormessage is deprecated - throws warnings in multiauth
        //if (pam_auth($username, $password, &$errormessage)) {
        if (pam_auth($username, $password)) {
            return true;
        }
        else {
            $this->lasterror = $errormessage;
            return false;
        }
    }

    function prevent_local_passwords() {
        return true;
    }

    function is_internal() {
        return false;
    }

    function can_change_password() {
        return false;
    }

    function config_form($config, $err, $user_fields) {
        include "config.html";
    }

    function process_config($config) {
        return true;
    }

}