class.tx_rsaauth_split_storage.php

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<?php
/***************************************************************
*  Copyright notice
*
*  (c) 2009-2011 Dmitry Dulepov <dmitry@typo3.org>
*  All rights reserved
*
*  This script is part of the TYPO3 project. The TYPO3 project is
*  free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  The GNU General Public License can be found at
*  http://www.gnu.org/copyleft/gpl.html.
*
*  This script 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 General Public License for more details.
*
*  This copyright notice MUST APPEAR in all copies of the script!
***************************************************************/

/**
 * [CLASS/FUNCTION INDEX of SCRIPT]
 *
 * $Id: class.tx_rsaauth_split_storage.php 10120 2011-01-18 20:03:36Z ohader $
 */

require_once(t3lib_extMgm::extPath('rsaauth', 'sv1/storage/class.tx_rsaauth_abstract_storage.php'));

/**
 * This class contains a "split" storage for the data. It keeps part of the data
 * in the database, part in the database.
 *
 * @author  Dmitry Dulepov <dmitry@typo3.org>
 * @package TYPO3
 * @subpackage  tx_rsaauth
 */
class tx_rsaauth_split_storage extends tx_rsaauth_abstract_storage {

    /**
     * Creates an instance of this class. It checks and initializes PHP
     * sessions if necessary.
     *
     * @return  void
     */
    public function __construct() {
        if (!isset($_SESSION) || !is_array($_SESSION)) {
            session_start();
        }
    }

    /**
     * Obtains a key from the database
     *
     * @return string   The key or null
     * @see tx_rsaauth_abstract_storage::get()
     */
    public function get() {
        $result = null;

        list($keyId, $keyPart1) = $_SESSION['tx_rsaauth_key'];
        if (t3lib_div::testInt($keyId)) {

            // Remove expired keys (more than 30 minutes old)
            $GLOBALS['TYPO3_DB']->exec_DELETEquery('tx_rsaauth_keys',
                        'crdate<' . ($GLOBALS['EXEC_TIME'] - 30 * 60));

                // Get our value
            $row = $GLOBALS['TYPO3_DB']->exec_SELECTgetSingleRow('key_value',
                'tx_rsaauth_keys', 'uid=' . $keyId);
            if (is_array($row)) {
                $result = $keyPart1 . $row['key_value'];
            }
        }
        return $result;
    }

    /**
     * Adds a key to the storage or removes existing key
     *
     * @param   string  $key    The key
     * @return  void
     * @see tx_rsaauth_abstract_storage::put()
     */
    public function put($key) {
        if ($key == null) {
            // Remove existing key
            list($keyId) = $_SESSION['tx_rsaauth_key'];

            if (t3lib_div::testInt($keyId)) {
                $GLOBALS['TYPO3_DB']->exec_DELETEquery('tx_rsaauth_keys',
                    'uid=' . $keyId);
                unset($_SESSION['tx_rsaauth_key']);
            }
        }
        else {
            // Add key

            // Get split point. First part is always smaller than the second
            // because it goes to the file system
            $keyLength = strlen($key);
            $splitPoint = rand(intval($keyLength/10), intval($keyLength/2));

            // Get key parts
            $keyPart1 = substr($key, 0, $splitPoint);
            $keyPart2 = substr($key, $splitPoint);

            // Store part of the key in the database
            //
            // Notice: we may not use TCEmain below to insert key part into the
            // table because TCEmain requires a valid BE user!
            $time = $GLOBALS['EXEC_TIME'];
            $GLOBALS['TYPO3_DB']->exec_INSERTquery('tx_rsaauth_keys', array(
                'pid' => 0,
                'crdate' => $time,
                'key_value' => $keyPart2
            ));
            $keyId = $GLOBALS['TYPO3_DB']->sql_insert_id();

            // Store another part in session
            $_SESSION['tx_rsaauth_key'] = array($keyId, $keyPart1);
        }

        // Remove expired keys (more than 30 minutes old)
        $GLOBALS['TYPO3_DB']->exec_DELETEquery('tx_rsaauth_keys',
                    'crdate<' . ($GLOBALS['EXEC_TIME'] - 30 * 60));
    }
}

if (defined('TYPO3_MODE') && isset($GLOBALS['TYPO3_CONF_VARS'][TYPO3_MODE]['XCLASS']['ext/rsaauth/sv1/storage/class.tx_rsaauth_split_storage.php'])) {
    include_once($GLOBALS['TYPO3_CONF_VARS'][TYPO3_MODE]['XCLASS']['ext/rsaauth/sv1/storage/class.tx_rsaauth_split_storage.php']);
}

?>