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<?php
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/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* SecureTokens.php
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*
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* @category Core
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* @package Core_Security
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* @subpackage WB-2.8.4 and up
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* @copyright Manuela v.d.Decken <manuela@isteam.de>
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* @author Manuela v.d.Decken <manuela@isteam.de>
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* @license http://www.gnu.org/licenses/gpl.html GPL License
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* @
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* @version 0.1.2
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* @revision $Revision: 2 $
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* @link $HeadURL: svn://isteam.dynxs.de/wb/2.10.x/trunk/framework/SecureTokens.php $
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* @lastmodified $Date: 2017-07-02 17:14:29 +0200 (Sun, 02 Jul 2017) $
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* @since File available since 12.09.2015
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* @description
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* This class is a replacement for the former class SecureForm using the SecureTokensInterface
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*
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* Settings for this class
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* TYPE KONSTANTE REGISTY-VAR DEFAULTWERT
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* boolean SEC_TOKEN_FINGERPRINT ($oReg->SecTokenFingerprint) [default=true]
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* integer SEC_TOKEN_IPV4_NETMASK ($oReg->SecTokenIpv4Netmask) 0-255 [default=24]
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* integer SEC_TOKEN_IPV6_PREFIX_LENGTH ($oReg->SecTokenIpv6PrefixLength) 0-128 [default=64]
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* integer SEC_TOKEN_LIFE_TIME ($oReg->SecTokenLifeTime) 1800 | 2700 | 3600[default] | 7200
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*/
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class SecureTokens
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{
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/**
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* possible settings for TokenLifeTime in seconds
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* @description seconds for 30min / 45min / 1h / 75min / 90min / 105min / 2h
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*/
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/** minimum lifetime in seconds */
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const LIFETIME_MIN = 1800; // 30min
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/** maximum lifetime in seconds */
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const LIFETIME_MAX = 7200; // 120min (2h)
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/** stepwidth between min and max */
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const LIFETIME_STEP = 900; // 15min
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/** lifetime in seconds to use in DEBUG mode if negative value is given (-1) */
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const DEBUG_LIFETIME = 300; // 5
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/** array to hold all tokens from the session */
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private $aTokens = array(
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'default' => array('value' => 0, 'expire' => 0, 'instance' => 0)
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);
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/** the salt for this instance */
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private $sSalt = '';
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/** fingerprint of the current connection */
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private $sFingerprint = '';
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/** the FTAN token which is valid for this instance */
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private $aLastCreatedFtan = null;
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/** the time when tokens expired if they created in this instance */
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private $iExpireTime = 0;
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/** remove selected tokens only and update all others */
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private $bPreserveAllOtherTokens = false;
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/** id of the current instance */
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private $sCurrentInstance = null;
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/** id of the instance to remove */
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private $sInstanceToDelete = null;
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/** id of the instance to update expire time */
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private $sInstanceToUpdate = null;
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/* --- settings for SecureTokens ------------------------------------------------------ */
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/** use fingerprinting to encode */
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private $bUseFingerprint = true;
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/** maximum lifetime of a token in seconds */
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private $iTokenLifeTime = 1800; // between LIFETIME_MIN and LIFETIME_MAX (default = 30min)
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/** bit length of the IPv4 Netmask (0-32 // 0 = off default = 24) */
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private $iNetmaskLengthV4 = 0;
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/** bit length of the IPv6 Netmask (0-128 // 0 = off default = 64) */
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private $iNetmaskLengthV6 = 0;
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private static $oInstance = null;
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/**
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* constructor
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* @param (void)
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*/
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protected function __construct()
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{
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// load settings if available
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$this->getSettings();
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// generate salt for calculations in this instance
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$this->sSalt = $this->generateSalt();
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// generate fingerprint for the current connection
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$this->sFingerprint = $this->buildFingerprint();
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// define the expiretime for this instance
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$this->iExpireTime = time() + $this->iTokenLifeTime;
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// calculate the instance id for this instance
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$this->sCurrentInstance = $this->encodeHash(md5($this->iExpireTime.$this->sSalt));
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// load array of tokens from session
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$this->loadTokens();
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// at first of all remove expired tokens
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$this->removeExpiredTokens();
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}
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public static function getInstance()
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{
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if (self::$oInstance == null) {
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$sClass = __CLASS__;
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self::$oInstance = new $sClass();
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}
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return self::$oInstance;
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}
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private function __clone() {}
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/**
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* destructor
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*/
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final public function __destruct()
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{
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foreach ($this->aTokens as $sKey => $aToken) {
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if ($aToken['instance'] == $this->sInstanceToUpdate) {
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$this->aTokens[$sKey]['instance'] = $this->sCurrentInstance;
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$this->aTokens[$sKey]['expire'] = $this->iExpireTime;
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} elseif ($aToken['instance'] == $this->sInstanceToDelete) {
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unset($this->aTokens[$sKey]);
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}
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}
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$this->saveTokens();
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}
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/**
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* returns the current FTAN
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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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* @deprecated the param $mMode is set deprecated
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* string retvals are set deprecated. From versions after 2.8.4 retval will be array only
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*/
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final public function getFTAN($mMode = 'POST')
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{
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if (is_null($this->aLastCreatedFtan)) {
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$sFtan = md5($this->sSalt);
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$this->aLastCreatedFtan = $this->addToken(
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substr($sFtan, rand(0,15), 16),
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substr($sFtan, rand(0,15), 16)
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);
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}
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$aFtan = $this->aTokens[$this->aLastCreatedFtan];
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$aFtan['name'] = $this->aLastCreatedFtan;
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$aFtan['value'] = $this->encodeHash(md5($aFtan['value'].$this->sFingerprint));
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if (is_string($mMode)) {
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$mMode = strtoupper($mMode);
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} else {
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$mMode = $mMode === true ? 'POST' : 'GET';
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}
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switch ($mMode):
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case 'POST':
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return '<input type="hidden" name="'.$aFtan['name'].'" value="'
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.$aFtan['value'].'" title="">';
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break;
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case 'GET':
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return $aFtan['name'].'='.$aFtan['value'];
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break;
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default:
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return array('name' => $aFtan['name'], 'value' => $aFtan['value']);
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endswitch;
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}
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/**
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* checks received form-transactionnumbers against session-stored one
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* @param string $mode: requestmethode POST(default) or GET
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* @param bool $bPreserve (default=false)
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* @return bool: true if numbers matches against stored ones
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*
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* requirements: an active session must be available
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* this check will prevent from multiple sending a form. history.back() also will never work
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*/
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final public function checkFTAN($mMode = 'POST')
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{
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$bRetval = false;
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// get the POST/GET arguments
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$aArguments = (strtoupper($mMode) == 'POST' ? $_POST : $_GET);
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// encode the value of all matching tokens
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$aMatchingTokens = array_map(
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array($this, 'checkFtanCallback'),
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// function ($aToken) {
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// return $this->encode64(md5($aToken['value'].$this->sFingerprint));
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// },
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// extract all matching tokens from $this->aTokens
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array_intersect_key($this->aTokens, $aArguments)
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);
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//echo "<pre>".print_r(debug_backtrace(0),true)."</pre>";
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// extract all matching arguments from $aArguments
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$aMatchingArguments = array_intersect_key($aArguments, $this->aTokens);
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// get all tokens with matching values from match lists
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$aHits = array_intersect($aMatchingTokens, $aMatchingArguments);
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foreach ($aHits as $sTokenName => $sValue) {
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$bRetval = true;
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$this->removeToken($sTokenName);
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}
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return $bRetval;
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}
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/**
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* store value in session and returns an accesskey to it
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* @param mixed $mValue can be numeric, string or array
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* @return string
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*/
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final public function getIDKEY($mValue)
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{
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if (is_array($mValue) == true) {
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// serialize value, if it's an array
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$mValue = serialize($mValue);
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}
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// crypt value with salt into md5-hash and return a 16-digit block from random start position
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$sTokenName = $this->addToken(
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substr(md5($this->sSalt.(string)$mValue), rand(0,15), 16),
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$mValue
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);
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return $sTokenName;
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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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* @param string $sFieldname: name of the POST/GET-Field containing the key or hex-key itself
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* @param mixed $mDefault: returnvalue if key not exist (default 0)
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* @param string $sRequest: requestmethode can be POST or GET or '' (default POST)
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* @param bool $bPreserve (default=false)
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* @return mixed: the original value (string, numeric, array) or DEFAULT if request fails
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* @description: each IDKEY can be checked only once. Unused Keys stay in list until they expire
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*/
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final public function checkIDKEY($sFieldname, $mDefault = 0, $sRequest = 'POST', $bPreserve = false)
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{
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$mReturnValue = $mDefault; // set returnvalue to default
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$this->bPreserveAllOtherTokens = $bPreserve ?: $this->bPreserveAllOtherTokens;
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$sRequest = strtoupper($sRequest);
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switch ($sRequest) {
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case 'POST':
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$sTokenName = $_POST[$sFieldname] ?: $sFieldname;
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break;
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case 'GET':
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$sTokenName = $_GET[$sFieldname] ?: $sFieldname;
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break;
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default:
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$sTokenName = $sFieldname;
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}
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if (preg_match('/^[0-9a-f]{16}$/i', $sTokenName)) {
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// key must be a 16-digit hexvalue
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if (array_key_exists($sTokenName, $this->aTokens)) {
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// check if key is stored in IDKEYs-list
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$mReturnValue = $this->aTokens[$sTokenName]['value']; // get stored value
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$this->removeToken($sTokenName); // remove from list to prevent multiuse
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if (preg_match('/.*(?<!\{).*(\d:\{.*;\}).*(?!\}).*/', $mReturnValue)) {
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// if value is a serialized array, then deserialize it
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$mReturnValue = unserialize($mReturnValue);
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}
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}
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}
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return $mReturnValue;
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}
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/**
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* make a valid LifeTime value from given integer on the rules of class SecureTokens
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* @param integer $iLifeTime
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* @return integer
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*/
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final public function sanitizeLifeTime($iLifeTime)
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{
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$iLifeTime = intval($iLifeTime);
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for ($i = self::LIFETIME_MIN; $i <= self::LIFETIME_MAX; $i += self::LIFETIME_STEP) {
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$aLifeTimes[] = $i;
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}
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$iRetval = array_pop($aLifeTimes);
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foreach ($aLifeTimes as $iValue) {
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if ($iLifeTime <= $iValue) {
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$iRetval = $iValue;
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break;
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}
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}
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return $iRetval;
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}
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/**
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* returns all TokenLifeTime values
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* @return array
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*/
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final public function getTokenLifeTime()
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{
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return array(
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'min' => self::LIFETIME_MIN,
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'max' => self::LIFETIME_MAX,
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'step' => self::LIFETIME_STEP,
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'value' => $this->iTokenLifeTime
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);
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}
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/* ************************************************************************************ */
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/* *** from here private methods only *** */
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/* ************************************************************************************ */
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/**
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* load all tokens from session
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*/
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private function loadTokens()
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{
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if (isset($_SESSION['TOKENS'])) {
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$this->aTokens = unserialize($_SESSION['TOKENS']);
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} else {
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$this->saveTokens();
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}
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}
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320
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/**
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* save all tokens into session
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*/
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private function saveTokens()
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{
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$_SESSION['TOKENS'] = serialize($this->aTokens);
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}
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327
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328
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/**
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* add new token to the list
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* @param string $sTokenName
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* @param string $sValue
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* @return string name(index) of the token
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*/
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private function addToken($sTokenName, $sValue)
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{
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// limit TokenName to 16 digits
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$sTokenName = substr(str_pad($sTokenName, 16, '0', STR_PAD_LEFT), -16);
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// make sure, first digit is a alpha char [a-f]
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$sTokenName[0] = dechex(10 + (hexdec($sTokenName[0]) % 5));
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// loop as long the generated TokenName already exists in list
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while (isset($this->aTokens[$sTokenName])) {
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// split TokenName into 4 words
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$aWords = str_split($sTokenName, 4);
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// get lowest word and increment it
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$iWord = hexdec($aWords[3]) + 1;
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// reformat integer into a 4 digit hex string
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$aWords[3] = sprintf('%04x', ($iWord > 0xffff ? 1 : $iWord));
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// rebuild the TokenName
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$sTokenName = implode('', $aWords);
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}
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// store Token in list
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$this->aTokens[$sTokenName] = array(
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'value' => $sValue,
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'expire' => $this->iExpireTime,
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'instance' => $this->sCurrentInstance
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);
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return $sTokenName;
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358
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}
|
359
|
|
360
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/**
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361
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* remove the token, called sTokenName from list
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362
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* @param type $sTokenName
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363
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*/
|
364
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private function removeToken($sTokenName)
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{
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366
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if (isset($this->aTokens[$sTokenName])) {
|
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if ($this->bPreserveAllOtherTokens) {
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368
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if ($this->sInstanceToDelete) {
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$this->sInstanceToUpdate = $this->sInstanceToDelete;
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$this->sInstanceToDelete = null;
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} else {
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$this->sInstanceToUpdate = $this->aTokens[$sTokenName]['instance'];
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}
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374
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} else {
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$this->sInstanceToDelete = $this->aTokens[$sTokenName]['instance'];
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}
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unset($this->aTokens[$sTokenName]);
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}
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}
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|
|
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/**
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382
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* remove all expired tokens from list
|
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*/
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private function removeExpiredTokens()
|
385
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{
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$iTimestamp = time();
|
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foreach ($this->aTokens as $sTokenName => $aToken) {
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if ($aToken['expire'] <= $iTimestamp && $aToken['expire'] != 0){
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unset($this->aTokens[$sTokenName]);
|
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}
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}
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392
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}
|
393
|
|
394
|
/**
|
395
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* generate a runtime depended hash
|
396
|
* @return string md5 hash
|
397
|
*/
|
398
|
private function generateSalt()
|
399
|
{
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|
list($fUsec, $fSec) = explode(" ", microtime());
|
401
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$sSalt = (string)rand(10000, 99999)
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. (string)((float)$fUsec + (float)$fSec)
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. (string)rand(10000, 99999);
|
404
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return md5($sSalt);
|
405
|
}
|
406
|
|
407
|
/**
|
408
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* build a simple fingerprint
|
409
|
* @return string
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410
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*/
|
411
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private function buildFingerprint()
|
412
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{
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413
|
if (!$this->bUseFingerprint) { return md5('this_is_a_dummy_only'); }
|
414
|
$sClientIp = '127.0.0.1';
|
415
|
if (array_key_exists('HTTP_X_FORWARDED_FOR', $_SERVER)){
|
416
|
$aTmp = preg_split('/\s*,\s*/', $_SERVER['HTTP_X_FORWARDED_FOR'], null, PREG_SPLIT_NO_EMPTY);
|
417
|
$sClientIp = array_pop($aTmp);
|
418
|
}else if (array_key_exists('REMOTE_ADDR', $_SERVER)) {
|
419
|
$sClientIp = $_SERVER['REMOTE_ADDR'];
|
420
|
}else if (array_key_exists('HTTP_CLIENT_IP', $_SERVER)) {
|
421
|
$sClientIp = $_SERVER['HTTP_CLIENT_IP'];
|
422
|
}
|
423
|
$aTmp = array_chunk(stat(__FILE__), 11);
|
424
|
unset($aTmp[0][8]);
|
425
|
return md5(
|
426
|
__FILE__ . PHP_VERSION . implode('', $aTmp[0])
|
427
|
. (array_key_exists('HTTP_USER_AGENT', $_SERVER) ? $_SERVER['HTTP_USER_AGENT'] : 'AGENT')
|
428
|
. $this->calcClientIpHash($sClientIp)
|
429
|
);
|
430
|
}
|
431
|
|
432
|
/**
|
433
|
* mask IPv4 as well IPv6 addresses with netmask and make a md5 hash from
|
434
|
* @param string $sClientIp IP as string from $_SERVER['REMOTE_ADDR']
|
435
|
* @return md5 value of masked ip
|
436
|
* @description this method does not accept the IPv6/IPv4 mixed format
|
437
|
* like "2222:3333:4444:5555:6666:7777:192.168.1.200"
|
438
|
*/
|
439
|
private function calcClientIpHash($sRawIp)
|
440
|
{
|
441
|
// clean address from netmask/prefix and port
|
442
|
$sPattern = '/^\[?([.:a-f0-9]*)(?:\/[0-1]*)?(?:\]?.*)$/im';
|
443
|
$sRawIp = preg_replace($sPattern, '$1', $sRawIp);
|
444
|
if (strpos($sRawIp, ':') === false) {
|
445
|
// sanitize IPv4 ---------------------------------------------------------------------- //
|
446
|
$iIpV4 = ip2long($sRawIp);
|
447
|
// calculate netmask
|
448
|
$iMask = ($this->iNetmaskLengthV4 < 1)
|
449
|
? 0
|
450
|
: bindec(
|
451
|
str_repeat('1', $this->iNetmaskLengthV4).
|
452
|
str_repeat('0', 32 - $this->iNetmaskLengthV4)
|
453
|
);
|
454
|
// apply mask and reformat to IPv4 string notation.
|
455
|
$sIp = long2ip($iIpV4 & $iMask);
|
456
|
} else {
|
457
|
// sanitize IPv6 ---------------------------------------------------------------------- //
|
458
|
// check if IP includes a IPv4 part and convert this into IPv6 format
|
459
|
$sPattern = '/^([:a-f0-9]*?)\:([0-9]{1,3}(?:\.[0-9]{1,3}){3})$/is';
|
460
|
if (preg_match($sPattern, $sRawIp, $aMatches)) {
|
461
|
// convert IPv4 into full size 32bit binary string
|
462
|
$sIpV4Bin = str_pad((string)decbin(ip2long($aMatches[2])), 32, '0', STR_PAD_LEFT) ;
|
463
|
// split into 2 parts of 16bit
|
464
|
$aIpV6Hex = str_split($sIpV4Bin, 16);
|
465
|
// concate the IPv6/96 part and hex of both IPv4 parts
|
466
|
$sRawIp = $aMatches[1].':'.dechex(bindec($aIpV6Hex[0])).':'.dechex(bindec($aIpV6Hex[1]));
|
467
|
}
|
468
|
// calculate number of missing IPv6 words
|
469
|
$iWords = 8 - count(preg_split('/:/', $sRawIp, null, PREG_SPLIT_NO_EMPTY));
|
470
|
// build multiple ':0000:' replacements for '::'
|
471
|
$sReplacement = $iWords ? implode(':', array_fill(0, $iWords, '0000')) : '';
|
472
|
// insert replacements and remove trailing/leading ':'
|
473
|
$sClientIp = trim(preg_replace('/\:\:/', ':'.$sReplacement.':', $sRawIp), ':');
|
474
|
// split all 8 parts from IP into an array
|
475
|
$aIpV6 = array_map(
|
476
|
function($sPart) {
|
477
|
// expand all parts to 4 hex digits using leading '0'
|
478
|
return str_pad($sPart, 4, '0', STR_PAD_LEFT);
|
479
|
},
|
480
|
preg_split('/:/', $sClientIp)
|
481
|
);
|
482
|
// build binary netmask from iNetmaskLengthV6
|
483
|
// and split all 8 parts into an array
|
484
|
if ($this->iNetmaskLengthV6 < 1) {
|
485
|
$aMask = array_fill(0, 8, str_repeat('0', 16));
|
486
|
} else {
|
487
|
$aMask = str_split(
|
488
|
str_repeat('1', $this->iNetmaskLengthV6).
|
489
|
str_repeat('0', 128 - $this->iNetmaskLengthV6),
|
490
|
16
|
491
|
);
|
492
|
}
|
493
|
// iterate all IP parts, apply its mask and reformat to IPv6 string notation.
|
494
|
array_walk(
|
495
|
$aIpV6,
|
496
|
function(&$sWord, $iIndex) use ($aMask) {
|
497
|
$sWord = sprintf('%04x', hexdec($sWord) & bindec($aMask[$iIndex]));
|
498
|
}
|
499
|
);
|
500
|
// reformat to IPv6 string notation.
|
501
|
$sIp = implode(':', $aIpV6);
|
502
|
// ------------------------------------------------------------------------------------ //
|
503
|
}
|
504
|
return md5($sIp); // return the hashed IP string
|
505
|
}
|
506
|
|
507
|
/**
|
508
|
* encode a hex string into a 64char based string
|
509
|
* @param string $sMd5Hash
|
510
|
* @return string
|
511
|
* @description reduce the 32char length of a MD5 to 22 chars
|
512
|
*/
|
513
|
private function encodeHash($sMd5Hash)
|
514
|
{
|
515
|
return preg_replace('/[^a-zA-Z0-9]/', '_', rtrim(base64_encode(pack('h*',$sMd5Hash)), '='));
|
516
|
// return rtrim(base64_encode(pack('h*',$sMd5Hash)), '+-= ');
|
517
|
}
|
518
|
|
519
|
// callback method, needed for PHP-5.3.x only
|
520
|
private function checkFtanCallback($aToken)
|
521
|
{
|
522
|
return $this->encodeHash(md5($aToken['value'].$this->sFingerprint));
|
523
|
}
|
524
|
|
525
|
/**
|
526
|
* read settings if available
|
527
|
*/
|
528
|
private function getSettings()
|
529
|
{
|
530
|
if (!class_exists('WbAdaptor', false)) {
|
531
|
// for WB before 2.8.4
|
532
|
$this->bUseFingerprint = defined('SEC_TOKEN_FINGERPRINT')
|
533
|
? SEC_TOKEN_FINGERPRINT
|
534
|
: $this->bUseFingerprint;
|
535
|
$this->iNetmaskLengthV4 = defined('SEC_TOKEN_NETMASK4')
|
536
|
? SEC_TOKEN_NETMASK4
|
537
|
: $this->iNetmaskLengthV4;
|
538
|
$this->iNetmaskLengthV6 = defined('SEC_TOKEN_NETMASK6')
|
539
|
? SEC_TOKEN_NETMASK6
|
540
|
: $this->iNetmaskLengthV6;
|
541
|
$this->iTokenLifeTime = defined('SEC_TOKEN_LIFE_TIME')
|
542
|
? SEC_TOKEN_LIFE_TIME
|
543
|
: $this->iTokenLifeTime;
|
544
|
} else {
|
545
|
// for WB from 2.8.4 and up
|
546
|
$oReg = WbAdaptor::getInstance();
|
547
|
$this->bUseFingerprint = isset($oReg->SecTokenFingerprint)
|
548
|
? $oReg->SecTokenFingerprint
|
549
|
: $this->bUseFingerprint;
|
550
|
$this->iNetmaskLengthV4 = isset($oReg->SecTokenIpv4Netmask)
|
551
|
? $oReg->SecTokenIpv4Netmask
|
552
|
: $this->iNetmaskLengthV4;
|
553
|
$this->iNetmaskLengthV6 = isset($oReg->SecTokenIpv6PrefixLength)
|
554
|
? $oReg->SecTokenIpv6PrefixLength
|
555
|
: $this->iNetmaskLengthV6;
|
556
|
$this->iTokenLifeTime = isset($oReg->SecTokenLifeTime)
|
557
|
? $oReg->SecTokenLifeTime
|
558
|
: $this->iTokenLifeTime;
|
559
|
}
|
560
|
$this->iNetmaskLengthV4 = ($this->iNetmaskLengthV4 < 1 || $this->iNetmaskLengthV4 > 32)
|
561
|
? 0 :$this->iNetmaskLengthV4;
|
562
|
$this->iNetmaskLengthV6 = ($this->iNetmaskLengthV6 < 1 || $this->iNetmaskLengthV6 > 128)
|
563
|
? 0 :$this->iNetmaskLengthV6;
|
564
|
$this->iTokenLifeTime = $this->sanitizeLifeTime($this->iTokenLifeTime);
|
565
|
if ($this->iTokenLifeTime <= self::LIFETIME_MIN && DEBUG) {
|
566
|
$this->iTokenLifeTime = self::DEBUG_LIFETIME;
|
567
|
}
|
568
|
}
|
569
|
|
570
|
|
571
|
} // end of class SecureTokens
|