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<?php
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/**
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*
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* @category framework
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* @package SecureForm
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* @author Independend-Software-Team
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* @author WebsiteBaker Project
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* @copyright 2004-2009, Ryan Djurovich
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* @copyright 2009-2011, Website Baker Org. e.V.
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* @link http://www.websitebaker2.org/
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* @license http://www.gnu.org/licenses/gpl.html
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* @platform WebsiteBaker 2.8.x
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* @requirements PHP 5.2.2 and higher
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* @version $Id: SecureForm.php 1457 2011-06-25 17:18:50Z Luisehahne $
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* @filesource $HeadURL: svn://isteam.dynxs.de/wb-archiv/tags/2.8.2/wb/framework/SecureForm.php $
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* @lastmodified $Date: 2011-06-25 19:18:50 +0200 (Sat, 25 Jun 2011) $
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* @description
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*/
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class SecureForm {
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const FRONTEND = 0;
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const BACKEND = 1;
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private $_FTAN = '';
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private $_IDKEYs = array('0'=>'0');
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private $_ftan_name = '';
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private $_idkey_name = '';
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private $_salt = '';
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private $_fingerprint = '';
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/* Construtor */
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protected function __construct($mode = self::FRONTEND)
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{
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$this->_FTAN = '';
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$this->_salt = $this->_generate_salt();
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$this->_fingerprint = $this->_generate_fingerprint();
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// generate names for session variables
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$this->_ftan_name =
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substr($this->_fingerprint, -(16 + hexdec($this->_fingerprint[0])), 16);
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// make sure there is a alpha-letter at first position
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$this->_ftan_name = $this->_makeFirst2Letter($this->_ftan_name);
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$this->_idkey_name =
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substr($this->_fingerprint, hexdec($this->_fingerprint[strlen($this->_fingerprint)-1]), 16);
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// make sure there is a alpha-letter at first position
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$this->_idkey_name = $this->_makeFirst2Letter($this->_idkey_name);
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// takeover id_keys from session if available
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if(isset($_SESSION[$this->_idkey_name]) && is_array($_SESSION[$this->_idkey_name]))
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{
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$this->_IDKEYs = $_SESSION[$this->_idkey_name];
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}else{
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$this->_IDKEYs = array('0'=>'0');
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$_SESSION[$this->_idkey_name] = $this->_IDKEYs;
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}
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}
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private function _makeFirst2Letter($string)
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{
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$string[0] = dechex(10 + (hexdec($string[0]) % 5));
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return $string;
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}
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private function _generate_salt()
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{
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if(function_exists('microtime'))
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{
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list($usec, $sec) = explode(" ", microtime());
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$salt = (string)((float)$usec + (float)$sec);
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}else{
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$salt = (string)time();
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}
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$salt = (string)rand(10000, 99999) . $salt . (string)rand(10000, 99999);
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return md5($salt);
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}
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private function _generate_fingerprint()
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{
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// server depending values
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$fingerprint = ( isset($_SERVER['SERVER_SIGNATURE']) ) ? $_SERVER['SERVER_SIGNATURE'] : '2';
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$fingerprint .= ( isset($_SERVER['SERVER_SOFTWARE']) ) ? $_SERVER['SERVER_SOFTWARE'] : '3';
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$fingerprint .= ( isset($_SERVER['SERVER_NAME']) ) ? $_SERVER['SERVER_NAME'] : '5';
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$fingerprint .= ( isset($_SERVER['SERVER_ADDR']) ) ? $_SERVER['SERVER_ADDR'] : '7';
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$fingerprint .= ( isset($_SERVER['SERVER_PORT']) ) ? $_SERVER['SERVER_PORT'] : '11';
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$fingerprint .= ( isset($_SERVER['SERVER_ADMIN']) ) ? $_SERVER['SERVER_ADMIN'] : '13';
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$fingerprint .= PHP_VERSION;
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// client depending values
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$fingerprint .= ( isset($_SERVER['HTTP_USER_AGENT']) ) ? $_SERVER['HTTP_USER_AGENT'] : '17';
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$usedOctets = ( defined('FINGERPRINT_WITH_IP_OCTETS') ) ? (intval(FINGERPRINT_WITH_IP_OCTETS) % 5) : 2;
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$clientIp = ( isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : '' );
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if(($clientIp != '') && ($usedOctets > 0)){
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$ip = explode('.', $clientIp);
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while(sizeof($ip) > $usedOctets) { array_pop($ip); }
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$clientIp = implode('.', $ip);
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}else {
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$clientIp = 19;
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}
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$fingerprint .= $clientIp;
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return md5($fingerprint);
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}
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private function _calcFtan($tanPart)
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{
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$ftan = md5($tanPart . $this->_fingerprint);
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$name = substr($ftan, -(16 + hexdec($ftan[0])), 16);
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$name = $this->_makeFirst2Letter($name);
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$value = substr($ftan, hexdec($ftan[strlen($ftan)-1]), 16);
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return array( $name, $value);
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}
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/**
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* creates Formular transactionnumbers for unique use
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*
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* @return void
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* requirements: an active session must be available
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*/
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final protected function createFTAN()
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{
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if( $this->_FTAN == '')
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{ // if no FTAN exists, create new one from time and salt
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$this->_FTAN = md5($this->_fingerprint.$this->_salt);
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$_SESSION[$this->_ftan_name] = $this->_FTAN; // store FTAN into session
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}
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}
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/*
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* returns the current FTAN
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* @access public
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* @param bool $mode: true or POST returns a complete prepared, hidden HTML-Input-Tag (default)
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* false or GET returns an GET argument 'key=value'
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* @return mixed: array or string
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*/
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final public function getFTAN( $mode = 'POST')
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{
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$ftan = $this->_calcFtan($this->_FTAN);
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if((is_string($mode) && strtolower($mode) == 'post') || ($mode === true))
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{ // by default return a complete, hidden <input>-tag
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return '<input type="hidden" name="'.$ftan[0].'" value="'.$ftan[1].'" title="" alt="" />';
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}else{ // return an string with GET params (FTAN0=FTAN1)
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return $ftan[0].'='.$ftan[1];
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}
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}
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/*
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* checks received form-transactionnumbers against session-stored one
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* @access public
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* @param string $mode: requestmethode POST(default) or GET
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* @return bool: true if numbers matches against stored ones
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*
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* requirements: an active session must be available
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* this check will prevent from multiple sending a form. history.back() also will never work
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*/
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final public function checkFTAN( $mode = 'POST')
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{
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$retval = false;
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if(isset($_SESSION[$this->_ftan_name]))
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{
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if( $_SESSION[$this->_ftan_name] && (strlen($_SESSION[$this->_ftan_name]) == strlen(md5('dummy'))))
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{
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$ftan = $this->_calcFtan($_SESSION[$this->_ftan_name]);
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unset($_SESSION[$this->_ftan_name]);
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$mode = (strtoupper($mode) != 'POST' ? '_GET' : '_POST');
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if( isset($GLOBALS[$mode][$ftan[0]]))
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{
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$retval = ($GLOBALS[$mode][$ftan[0]] == $ftan[1]);
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unset($GLOBALS[$mode][$ftan[0]]);
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}
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}
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}
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return $retval;
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}
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/*
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* save values in session and returns a ID-key
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* @access public
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* @param mixed $value: the value for witch a key shall be generated and memorized
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* @return string: a MD5-Key to use instead of the real value
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*
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* @requirements: an active session must be available
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* @description: IDKEY can handle string/numeric/array - vars. Each key is a
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*/
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final public function getIDKEY($value)
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{
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if( is_array($value) == true )
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{ // serialize value, if it's an array
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$value = serialize($value);
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}
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// crypt value with salt into md5-hash
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// and return a 16-digit block from random start position
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$key = substr( md5($this->_salt.(string)$value), rand(0,15), 16);
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do{ // loop while key/value isn't added
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if( !array_key_exists($key, $this->_IDKEYs) )
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{ // the key is unique, so store it in list
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$this->_IDKEYs[$key] = $value;
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break;
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}else {
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// if key already exist, increment the last five digits until the key is unique
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$key = substr($key, 0, -5).dechex(('0x'.substr($key, -5)) + 1);
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}
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}while(0);
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// store key/value-pairs into session
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$_SESSION[$this->_idkey_name] = $this->_IDKEYs;
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return $key;
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}
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/*
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* search for key in session and returns the original value
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* @access public
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* @param string $fieldname: name of the POST/GET-Field containing the key or hex-key itself
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* @param mixed $default: returnvalue if key not exist (default 0)
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* @param string $request: requestmethode can be POST or GET or '' (default POST)
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* @return mixed: the original value (string, numeric, array) or DEFAULT if request fails
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*
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* @requirements: an active session must be available
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* @description: each IDKEY can be checked only once. Unused Keys stay in list until the
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* session is destroyed.
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*/
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final public function checkIDKEY( $fieldname, $default = 0, $request = 'POST' )
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{
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$return_value = $default; // set returnvalue to default
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switch( strtoupper($request) )
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{
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case 'POST':
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$key = isset($_POST[$fieldname]) ? $_POST[$fieldname] : $fieldname;
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break;
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case 'GET':
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$key = isset($_GET[$fieldname]) ? $_GET[$fieldname] : $fieldname;
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break;
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default:
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$key = $fieldname;
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}
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if( preg_match('/[0-9a-f]{16}$/', $key) )
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{ // key must be a 16-digit hexvalue
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if( array_key_exists($key, $this->_IDKEYs))
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{ // check if key is stored in IDKEYs-list
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$return_value = $this->_IDKEYs[$key]; // get stored value
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unset($this->_IDKEYs[$key]); // remove from list to prevent multiuse
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$_SESSION[$this->_idkey_name] = $this->_IDKEYs; // save modified list into session again
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if( preg_match('/.*(?<!\{).*(\d:\{.*;\}).*(?!\}).*/', $return_value) )
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{ // if value is a serialized array, then deserialize it
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$return_value = unserialize($return_value);
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}
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}
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}
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return $return_value;
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}
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/* @access public
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* @return void
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*
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* @requirements: an active session must be available
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* @description: remove all entries from IDKEY-Array
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*
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*/
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final public function clearIDKEY()
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{
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$this->_IDKEYs = array('0'=>'0');
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}
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}
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