1: <?php
  2: /**
  3:  * Digest authentication
  4:  *
  5:  * PHP 5
  6:  *
  7:  * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
  8:  * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
  9:  *
 10:  * Licensed under The MIT License
 11:  * For full copyright and license information, please see the LICENSE.txt
 12:  * Redistributions of files must retain the above copyright notice.
 13:  *
 14:  * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 15:  * @link          http://cakephp.org CakePHP(tm) Project
 16:  * @package       Cake.Network.Http
 17:  * @since         CakePHP(tm) v 2.0.0
 18:  * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 19:  */
 20: 
 21: /**
 22:  * Digest authentication
 23:  *
 24:  * @package       Cake.Network.Http
 25:  */
 26: class DigestAuthentication {
 27: 
 28: /**
 29:  * Authentication
 30:  *
 31:  * @param HttpSocket $http
 32:  * @param array $authInfo
 33:  * @return void
 34:  * @link http://www.ietf.org/rfc/rfc2617.txt
 35:  */
 36:     public static function authentication(HttpSocket $http, &$authInfo) {
 37:         if (isset($authInfo['user'], $authInfo['pass'])) {
 38:             if (!isset($authInfo['realm']) && !self::_getServerInformation($http, $authInfo)) {
 39:                 return;
 40:             }
 41:             $http->request['header']['Authorization'] = self::_generateHeader($http, $authInfo);
 42:         }
 43:     }
 44: 
 45: /**
 46:  * Retrieve information about the authentication
 47:  *
 48:  * @param HttpSocket $http
 49:  * @param array $authInfo
 50:  * @return boolean
 51:  */
 52:     protected static function _getServerInformation(HttpSocket $http, &$authInfo) {
 53:         $originalRequest = $http->request;
 54:         $http->configAuth(false);
 55:         $http->request($http->request);
 56:         $http->request = $originalRequest;
 57:         $http->configAuth('Digest', $authInfo);
 58: 
 59:         if (empty($http->response['header']['WWW-Authenticate'])) {
 60:             return false;
 61:         }
 62:         preg_match_all('@(\w+)=(?:(?:")([^"]+)"|([^\s,$]+))@', $http->response['header']['WWW-Authenticate'], $matches, PREG_SET_ORDER);
 63:         foreach ($matches as $match) {
 64:             $authInfo[$match[1]] = $match[2];
 65:         }
 66:         if (!empty($authInfo['qop']) && empty($authInfo['nc'])) {
 67:             $authInfo['nc'] = 1;
 68:         }
 69:         return true;
 70:     }
 71: 
 72: /**
 73:  * Generate the header Authorization
 74:  *
 75:  * @param HttpSocket $http
 76:  * @param array $authInfo
 77:  * @return string
 78:  */
 79:     protected static function _generateHeader(HttpSocket $http, &$authInfo) {
 80:         $a1 = md5($authInfo['user'] . ':' . $authInfo['realm'] . ':' . $authInfo['pass']);
 81:         $a2 = md5($http->request['method'] . ':' . $http->request['uri']['path']);
 82: 
 83:         if (empty($authInfo['qop'])) {
 84:             $response = md5($a1 . ':' . $authInfo['nonce'] . ':' . $a2);
 85:         } else {
 86:             $authInfo['cnonce'] = uniqid();
 87:             $nc = sprintf('%08x', $authInfo['nc']++);
 88:             $response = md5($a1 . ':' . $authInfo['nonce'] . ':' . $nc . ':' . $authInfo['cnonce'] . ':auth:' . $a2);
 89:         }
 90: 
 91:         $authHeader = 'Digest ';
 92:         $authHeader .= 'username="' . str_replace(array('\\', '"'), array('\\\\', '\\"'), $authInfo['user']) . '", ';
 93:         $authHeader .= 'realm="' . $authInfo['realm'] . '", ';
 94:         $authHeader .= 'nonce="' . $authInfo['nonce'] . '", ';
 95:         $authHeader .= 'uri="' . $http->request['uri']['path'] . '", ';
 96:         $authHeader .= 'response="' . $response . '"';
 97:         if (!empty($authInfo['opaque'])) {
 98:             $authHeader .= ', opaque="' . $authInfo['opaque'] . '"';
 99:         }
100:         if (!empty($authInfo['qop'])) {
101:             $authHeader .= ', qop="auth", nc=' . $nc . ', cnonce="' . $authInfo['cnonce'] . '"';
102:         }
103:         return $authHeader;
104:     }
105: 
106: }
107: