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1479
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Luisehahne
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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.mtab
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* @author WebsiteBaker Community 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 2.8.2
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* @requirements PHP 5.2.2 and higher
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* @version $Id$
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* @filesource $HeadURL$
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* @lastmodified $Date$
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* @description
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*/
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## Heavy patched version, idea for patches based on :
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## http://stackoverflow.com/questions/2695153/php-csrf-how-to-make-it-works-in-all-tabs/2695291#2695291
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## Whith this patch the token System now allows for multiple browser tabs but
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## denies the use of multiple browsers.
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## You can configure this class by adding several constants to your config.php
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## All Patches are Copyright Norbert Heimsath released under GPLv3
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## http://www.gnu.org/licenses/gpl.html
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## Take a look at __construkt for configuration options(constants).
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## Patch version 0.3.5
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/**
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* If you want some special configuration put this somewhere in your config.php for
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* example or just uncomment the lines here
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*
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* This parameter now can be set with the admintool SecureForm Switcher coded by Luisehahne,
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* pls ask for it in the forum
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*
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* Secret can contain anything its the base for the secret part for the hash
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* define ('WB_SECFORM_SECRET','whatever you like');
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* after how many seconds a new secret is generated
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* define ('WB_SECFORM_SECRETTIME',86400); #aprox one day
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* shall we use fingerprinting true/false
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* define ('WB_SECFORM_USEFP', true);
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* Timeout till the form token times out. Integer value between 0-86400 seconds (one day)
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* define ('WB_SECFORM_TIMEOUT', 3600);
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* Name for the token form element only alphanumerical string allowed that starts whith a charakter
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* define ('WB_SECFORM_TOKENNAME','my3form3');
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* how many blocks of the IP should be used in fingerprint 0=no ipcheck, possible values 0-4
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* define ('FINGERPRINT_WITH_IP_OCTETS',2);
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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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## additional private data
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private $_secret = '5609bnefg93jmgi99igjefg';
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private $_secrettime = 86400; #Approx. one day
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private $_tokenname = 'formtoken';
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private $_timeout = 7200;
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private $_useipblocks = 2;
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private $_usefingerprint = true;
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### additional private data
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private $_FTAN = '';
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private $_IDKEYs = array('0'=>'0');
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private $_idkey_name = '';
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private $_salt = '';
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private $_fingerprint = '';
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private $_serverdata = '';
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/* Construtor */
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protected function __construct($mode = self::FRONTEND){
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## additional constants and stuff for global configuration
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# Secret can contain anything its the base for the secret part of the hash
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if (defined ('WB_SECFORM_SECRET')){
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$this->_secret=WB_SECFORM_SECRET;
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}
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# shall we use fingerprinting
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if (defined ('WB_SECFORM_USEFP') AND WB_SECFORM_USEFP===false){
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$this->_usefingerprint = false;
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}
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# Timeout till the form token times out. Integer value between 0-86400 seconds (one day)
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if (defined ('WB_SECFORM_TIMEOUT') AND is_numeric(WB_SECFORM_TIMEOUT) AND intval(WB_SECFORM_TIMEOUT) >=0 AND intval(WB_SECFORM_TIMEOUT) <=86400 ){
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$this->_timeout=intval(WB_SECFORM_TIMEOUT);
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}
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# Name for the token form element only alphanumerical string allowed that starts whith a charakter
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if (defined ('WB_SECFORM_TOKENNAME') AND !$this->_validate_alalnum(WB_SECFORM_TOKENNAME)){
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$this->_tokenname=WB_SECFORM_TOKENNAME;
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}
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# how many bloks of the IP should be used 0=no ipcheck
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if (defined ('FINGERPRINT_WITH_IP_OCTETS') AND !$this->_is04(FINGERPRINT_WITH_IP_OCTETS)){
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$this->_useipblocks=FINGERPRINT_WITH_IP_OCTETS;
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}
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## additional stuff end
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$this->_browser_fingerprint = $this->_browser_fingerprint(true);
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$this->_fingerprint = $this->_generate_fingerprint();
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$this->_serverdata = $this->_generate_serverdata();
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$this->_secret = $this->_generate_secret();
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$this->_salt = $this->_generate_salt();
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$this->_idkey_name = 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[0] = dechex(10 + (hexdec($this->_idkey_name[0]) % 5));
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// takeover id_keys from session if available
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if(isset($_SESSION[$this->_idkey_name]) && is_array($_SESSION[$this->_idkey_name])){
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$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] = $this->_IDKEYs;
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}
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}
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private function _generate_secret(){
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$secret= $this->_secret;
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$secrettime= $this->_secrettime;
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#create a different secret every day
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$TimeSeed= floor(time()/$secrettime)*$secrettime; #round(floor) time() to whole days
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$DomainSeed = $_SERVER['SERVER_NAME']; # generate a numerical from server name.
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$Seed = $TimeSeed+$DomainSeed;
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$secret .=md5($Seed); #
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$secret .= $this->_secret.$this->_serverdata.session_id();
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if ($this->_usefingerprint){$secret.= $this->_browser_fingerprint;}
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return $secret;
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}
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private function _generate_salt()
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{
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if(function_exists('microtime'))
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{
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list($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 = $this->_generate_serverdata();
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// client depending values
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$fingerprint .= ( isset($_SERVER['HTTP_USER_AGENT']) ) ? $_SERVER['HTTP_USER_AGENT'] : '17';
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$usedOctets = ( defined('FINGERPRINT_WITH_IP_OCTETS') ) ? intval(defined('FINGERPRINT_WITH_IP_OCTETS')) : 0;
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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 _generate_serverdata(){
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$serverdata = ( isset($_SERVER['SERVER_SIGNATURE']) ) ? $_SERVER['SERVER_SIGNATURE'] : '2';
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$serverdata .= ( isset($_SERVER['SERVER_SOFTWARE']) ) ? $_SERVER['SERVER_SOFTWARE'] : '3';
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$serverdata .= ( isset($_SERVER['SERVER_NAME']) ) ? $_SERVER['SERVER_NAME'] : '5';
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$serverdata .= ( isset($_SERVER['SERVER_ADDR']) ) ? $_SERVER['SERVER_ADDR'] : '7';
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$serverdata .= ( isset($_SERVER['SERVER_PORT']) ) ? $_SERVER['SERVER_PORT'] : '11';
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$serverdata .= ( isset($_SERVER['SERVER_ADMIN']) ) ? $_SERVER['SERVER_ADMIN'] : '13';
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$serverdata .= PHP_VERSION;
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return $serverdata;
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}
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// fake funktion , just exits to avoid error message
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final protected function createFTAN(){}
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/*
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* creates selfsigning Formular transactionnumbers for unique use
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* @access public
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* @param bool $asTAG: true returns a complete prepared, hidden HTML-Input-Tag (default)
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* false returns an GET argument 'key=value'
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* @return mixed: string
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*
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* requirements: an active session must not be available but it makes no sense whithout :-)
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*/
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final public function getFTAN( $as_tag = true)
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{
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$secret= $this->_secret;
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$timeout= time()+$this->_timeout;
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#mt_srand(hexdec(crc32(microtime()));
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$token= dechex(mt_rand());
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$hash= sha1($secret.'-'.$token.'-'.$timeout);
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$signed= $token.'-'.$timeout.'-'.$hash;
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if($as_tag == true)
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{ // by default return a complete, hidden <input>-tag
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return '<input type="hidden" name="'.$this->_tokenname.'" value="'.htmlspecialchars($signed).'" title="" alt="" />';
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}else{ // return an array with raw tokenname=value
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return $this->_tokenname.'='.$signed;
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}
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}
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/*
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* checks received form-transactionnumbers against itself
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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: no active session must be available but it makes no sense whithout.
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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( $mode = 'POST')
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{
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$mode = (strtoupper($mode) != 'POST' ? '_GET' : '_POST');
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$isok= false;
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$secret= $this->_secret;
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if (isset($GLOBALS[$mode][$this->_tokenname])) {$latoken=$GLOBALS[$mode][$this->_tokenname];}
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else {return $isok;}
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$parts= explode('-', $latoken);
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if (count($parts)==3) {
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list($token,$timeout, $hash)= $parts;
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if ($hash==sha1($secret.'-'.$token.'-'.$timeout) AND $timeout > time())
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{$isok= true;}
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}
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return $isok;
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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 $return_value;
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}
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315 |
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/* @access public
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* @return void
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*
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318 |
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* @requirements: an active session must be available
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* @description: remove all entries from IDKEY-Array
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*
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*/
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final public function clearIDKEY()
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{
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$this->_IDKEYs = array('0'=>'0');
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}
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326 |
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327 |
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328 |
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## additional Functions needed cause the original ones lack some functionality
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329 |
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## all are Copyright Norbert Heimsath, heimsath.org
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330 |
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## released under GPLv3 http://www.gnu.org/licenses/gpl.html
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/* Made because ctype_ gives strange results using mb Strings*/
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private function _validate_alalnum($input){
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# alphanumerical string that starts whith a letter charakter
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if (preg_match('/^[a-zA-Z][0-9a-zA-Z]+$/u', $input))
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{return false;}
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return "The given input is not an alphanumeric string.";
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}
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private function _is04($input){
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# integer value between 0-4
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if (preg_match('/^[0-4]$/', $input)) {return false;}
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return "The given input is not an alphanumeric string.";
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}
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private function _getip($ipblocks=4){
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/*
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351 |
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Just a function to get User ip even if hes behind a proxy
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*/
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353 |
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$ip = ""; //Ip address result
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$cutip = ""; //Ip address cut to limit
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# mabe user is behind a Proxy but we need his real ip address if we got a nice Proxyserver,
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# it sends us the "HTTP_X_FORWARDED_FOR" Header. Sometimes there is more than one Proxy.
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358 |
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# !!!!!! THIS PART WAS NEVER TESTED BECAUSE I ONLY GOT A DIRECT INTERNET CONNECTION !!!!!!
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359 |
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# long2ip(ip2long($lastip)) makes sure we got nothing else than an ip into our script ;-)
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360 |
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# !!!!! WARNING the 'HTTP_X_FORWARDED_FOR' Part is NOT TESTED !!!!!
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361 |
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if (isset($_SERVER['HTTP_X_FORWARDED_FOR']) AND !empty($_SERVER['HTTP_X_FORWARDED_FOR']))
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362 |
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{
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363 |
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$iplist= explode(',',$_SERVER['HTTP_X_FORWARDED_FOR']);
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364 |
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$lastip = array_pop($iplist);
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365 |
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$ip.= long2ip(ip2long($lastip));
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}
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367 |
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368 |
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/* If theres no other supported info we just use REMOTE_ADDR
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369 |
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If we have a fiendly proxy supporting HTTP_X_FORWARDED_FOR its ok to use the full address.
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370 |
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But if there is no HTTP_X_FORWARDED_FOR we can not be sure if its a proxy or whatever, so we use the
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371 |
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blocklimit for IP address.
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372 |
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*/
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373 |
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else
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{
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375 |
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$ip = long2ip(ip2long($_SERVER['REMOTE_ADDR']));
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376 |
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377 |
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# ipblocks used here defines how many blocks of the ip adress are checked xxx.xxx.xxx.xxx
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$blocks = explode('.', $ip);
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379 |
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for ($i=0; $i<$ipblocks; $i++){
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380 |
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$cutip.= $blocks[$i] . '.';
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381 |
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}
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382 |
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$ip=substr($cutip, 0, -1);
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383 |
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}
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384 |
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385 |
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return $ip;
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386 |
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}
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387 |
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|
388 |
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private function _browser_fingerprint($encode=true,$fpsalt="My Fingerprint: "){
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389 |
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/*
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390 |
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Creates a basic Browser Fingerprint for securing the session and forms.
|
391 |
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*/
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392 |
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|
393 |
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$fingerprint=$fpsalt;
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394 |
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if (isset($_SERVER['HTTP_USER_AGENT'])){ $fingerprint .= $_SERVER['HTTP_USER_AGENT'];}
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395 |
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if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])){ $fingerprint .= $_SERVER['HTTP_ACCEPT_LANGUAGE'];}
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396 |
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if (isset($_SERVER['HTTP_ACCEPT_ENCODING'])){ $fingerprint .= $_SERVER['HTTP_ACCEPT_ENCODING'];}
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397 |
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if (isset($_SERVER['HTTP_ACCEPT_CHARSET'])){ $fingerprint .= $_SERVER['HTTP_ACCEPT_CHARSET'];}
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398 |
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|
399 |
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$fingerprint.= $this->_getip($this->_useipblocks);
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400 |
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|
401 |
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if ($encode){$fingerprint=md5($fingerprint);}
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402 |
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|
403 |
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return $fingerprint;
|
404 |
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}
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405 |
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##
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406 |
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## additional Functions END
|
407 |
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##
|
408 |
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}
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