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Dir : ~/usr/share/psa-pear/pear/php/Horde/Auth/

Edit File: Pam.php

<?php
/**
 * Copyright 2004-2017 Horde LLC (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you did
 * not receive this file, see http://www.horde.org/licenses/lgpl21.
 *
 * @author   Jon Parise <jon@horde.org>
 * @category Horde
 * @license  http://www.horde.org/licenses/lgpl21 LGPL-2.1
 * @package  Auth
 */

/**
 * The Horde_Auth_Pam:: class provides a PAM-based implementation of the Horde
 * authentication system.
 *
 * PAM (Pluggable Authentication Modules) is a flexible mechanism for
 * authenticating users. It has become the standard authentication system for
 * Linux, Solaris and FreeBSD.
 *
 * This driver relies on the PECL PAM package:
 *
 *      http://pecl.php.net/package/PAM
 *
 * @author    Jon Parise <jon@horde.org>
 * @category  Horde
 * @copyright 2004-2017 Horde LLC
 * @license   http://www.horde.org/licenses/lgpl21 LGPL-2.1
 * @package   Auth
 */
class Horde_Auth_Pam extends Horde_Auth_Base
{
    /**
     * Constructor.
     *
     * @param array $params  Optional parameters:
     * <pre>
     * 'service' - (string) The name of the PAM service to use when
     *             authenticating.
     *             DEFAULT: php
     * </pre>
     *
     * @throws Horde_Auth_Exception
     */
    public function __construct(array $params = array())
    {
        if (!Horde_Util::extensionExists('pam')) {
            throw new Horde_Auth_Exception('PAM authentication is not available.');
        }

if (!empty($params['service'])) {
            ini_set('pam.servicename', $params['service']);
        }

parent::__construct($params);
    }

/**
     * Find out if a set of login credentials are valid.
     *
     * @param string $userId      The userId to check.
     * @param array $credentials  An array of login credentials.
     *
     * @throws Horde_Auth_Exception
     */
    protected function _authenticate($userId, $credentials)
    {
        if (empty($credentials['password'])) {
            throw new Horde_Auth_Exception('', Horde_Auth::REASON_BADLOGIN);
        }

$error = null;
        if (!pam_auth($userId, $credentials['password'], $error)) {
            throw new Horde_Auth_Exception($error);
        }
    }

}