luos/workflow/engine/methods/login/sysLoginVerify.php

<?php

/**
 * sysLoginVerify.php
 *  
 * ProcessMaker Open Source Edition
 * Copyright (C) 2004 - 2008 Colosa Inc.23
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * For more information, contact Colosa Inc, 2566 Le Jeune Rd., 
 * Coral Gables, FL, 33134, USA, or email info@colosa.com.
 * 
 */

if (array_key_exists("d", $_GET)) {
    $str = base64_decode($_GET["d"]);
    if (preg_match('/^a:[0-9]+:{/', $str) && !preg_match('/(^|;|{|})O:\+?[0-9]+:"/', $str)) {
        $_POST = unserialize($str);
    }
}

if (!isset($_POST)) {
    G::header('location: /sys/' . $lang . '/' . SYS_SKIN . '/' . 'login/login');
}
if (isset($_SESSION['sysLogin'])) {
    $_POST['form'] = $_SESSION['sysLogin'];
    // Destroy variables already assigned to the global variable $_POST
    unset($_SESSION['sysLogin']);
}

require_once 'authentication.php';