includes/api/ApiLogin.php

   1 <?php
   2
   3 /*
   4  * Created on Sep 19, 2006
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright (C) 2006-2007 Yuri Astrakhan <Firstname><Lastname>@gmail.com,
   9  * Daniel Cannon (cannon dot danielc at gmail dot com)
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  * http://www.gnu.org/copyleft/gpl.html
  25  */
  26
  27 if (!defined('MEDIAWIKI')) {
  28         // Eclipse helper - will be ignored in production
  29         require_once ('ApiBase.php');
  30 }
  31
  32 /**
  33  * Unit to authenticate log-in attempts to the current wiki.
  34  *
  35  * @addtogroup API
  36  */
  37 class ApiLogin extends ApiBase {
  38
  39         /**
  40          * Time (in seconds) a user must wait after submitting
  41          * a bad login (will be multiplied by the THROTTLE_FACTOR for each bad attempt)
  42          */
  43         const THROTTLE_TIME = 5;
  44
  45         /**
  46          * The factor by which the wait-time in between authentication
  47          * attempts is increased every failed attempt.
  48          */
  49         const THROTTLE_FACTOR = 2;
  50
  51         /**
  52          * The maximum number of failed logins after which the wait increase stops.
  53          */
  54         const THOTTLE_MAX_COUNT = 10;
  55
  56         public function __construct($main, $action) {
  57                 parent :: __construct($main, $action, 'lg');
  58         }
  59
  60         /**
  61          * Executes the log-in attempt using the parameters passed. If
  62          * the log-in succeeeds, it attaches a cookie to the session
  63          * and outputs the user id, username, and session token. If a
  64          * log-in fails, as the result of a bad password, a nonexistant
  65          * user, or any other reason, the host is cached with an expiry
  66          * and no log-in attempts will be accepted until that expiry
  67          * is reached. The expiry is $this->mLoginThrottle.
  68          *
  69          * @access public
  70          */
  71         public function execute() {
  72                 $name = $password = $domain = null;
  73                 extract($this->extractRequestParams());
  74
  75                 $result = array ();
  76
  77                 // Make sure noone is trying to guess the password brut-force
  78                 $nextLoginIn = $this->getNextLoginTimeout();
  79                 if ($nextLoginIn > 0) {
  80                         $result['result']  = 'NeedToWait';
  81                         $result['details'] = "Please wait $nextLoginIn seconds before next log-in attempt";
  82                         $result['wait'] = $nextLoginIn;
  83                         $this->getResult()->addValue(null, 'login', $result);
  84                         return;
  85                 }
  86
  87                 $params = new FauxRequest(array (
  88                         'wpName' => $name,
  89                         'wpPassword' => $password,
  90                         'wpDomain' => $domain,
  91                         'wpRemember' => ''
  92                 ));
  93
  94                 $loginForm = new LoginForm($params);
  95                 switch ($loginForm->authenticateUserData()) {
  96                         case LoginForm :: SUCCESS :
  97                                 global $wgUser, $wgCookiePrefix;
  98
  99                                 $wgUser->setOption('rememberpassword', 1);
 100                                 $wgUser->setCookies();
 101
 102                                 $result['result'] = 'Success';
 103                                 $result['lguserid'] = $_SESSION['wsUserID'];
 104                                 $result['lgusername'] = $_SESSION['wsUserName'];
 105                                 $result['lgtoken'] = $_SESSION['wsToken'];
 106                                 $result['cookieprefix'] = $wgCookiePrefix;
 107                                 $result['sessionid'] = $_COOKIE["{$wgCookiePrefix}_session"];
 108                                 break;
 109
 110                         case LoginForm :: NO_NAME :
 111                                 $result['result'] = 'NoName';
 112                                 break;
 113                         case LoginForm :: ILLEGAL :
 114                                 $result['result'] = 'Illegal';
 115                                 break;
 116                         case LoginForm :: WRONG_PLUGIN_PASS :
 117                                 $result['result'] = 'WrongPluginPass';
 118                                 break;
 119                         case LoginForm :: NOT_EXISTS :
 120                                 $result['result'] = 'NotExists';
 121                                 break;
 122                         case LoginForm :: WRONG_PASS :
 123                                 $result['result'] = 'WrongPass';
 124                                 break;
 125                         case LoginForm :: EMPTY_PASS :
 126                                 $result['result'] = 'EmptyPass';
 127                                 break;
 128                         default :
 129                                 ApiBase :: dieDebug(__METHOD__, 'Unhandled case value');
 130                 }
 131
 132                 if ($result['result'] != 'Success') {
 133                         $result['wait'] = $this->cacheBadLogin();
 134                         $result['details'] = "Please wait " . self::THROTTLE_TIME . " seconds before next log-in attempt";
 135                 }
 136                 // if we were allowed to try to login, memcache is fine
 137
 138                 $this->getResult()->addValue(null, 'login', $result);
 139         }
 140
 141
 142         /**
 143          * Caches a bad-login attempt associated with the host and with an
 144          * expiry of $this->mLoginThrottle. These are cached by a key
 145          * separate from that used by the captcha system--as such, logging
 146          * in through the standard interface will get you a legal session
 147          * and cookies to prove it, but will not remove this entry.
 148          *
 149          * Returns the number of seconds until next login attempt will be allowed.
 150          *
 151          * @access private
 152          */
 153         private function cacheBadLogin() {
 154                 global $wgMemc;
 155
 156                 $key = $this->getMemCacheKey();
 157                 $val = $wgMemc->get( $key );
 158
 159                 $val['lastReqTime'] = time();
 160                 if (!isset($val['count'])) {
 161                         $val['count'] = 1;
 162                 } else {
 163                         $val['count'] = 1 + $val['count'];
 164                 }
 165
 166                 $delay = ApiLogin::calculateDelay($val['count']);
 167
 168                 $wgMemc->delete($key);
 169                 // Cache expiration should be the maximum timeout - to prevent a "try and wait" attack
 170                 $wgMemc->add( $key, $val, ApiLogin::calculateDelay(ApiLogin::THOTTLE_MAX_COUNT) );
 171
 172                 return $delay;
 173         }
 174
 175         /**
 176          * How much time the client must wait before it will be
 177          * allowed to try to log-in next.
 178          * The return value is 0 if no wait is required.
 179          */
 180         private function getNextLoginTimeout() {
 181                 global $wgMemc;
 182
 183                 $val = $wgMemc->get($this->getMemCacheKey());
 184
 185                 $elapse = (time() - $val['lastReqTime']);  // in seconds
 186                 $canRetryIn = ApiLogin::calculateDelay($val['count']) - $elapse;
 187
 188                 return $canRetryIn < 0 ? 0 : $canRetryIn;
 189         }
 190
 191         /**
 192          * Based on the number of previously attempted logins, returns
 193          * the delay (in seconds) when the next login attempt will be allowed.
 194          */
 195         private static function calculateDelay($count) {
 196                 // Defensive programming
 197                 $count = intval($count);
 198                 $count = $count < 1 ? 1 : $count;
 199                 $count = $count > self::THOTTLE_MAX_COUNT ? self::THOTTLE_MAX_COUNT : $count;
 200
 201                 return self::THROTTLE_TIME + self::THROTTLE_TIME * ($count - 1) * self::THROTTLE_FACTOR;
 202         }
 203
 204         /**
 205         * Internal cache key for badlogin checks. Robbed from the
 206         * ConfirmEdit extension and modified to use a key unique to the
 207         * API login.3
 208         *
 209         * @return string
 210         * @access private
 211         */
 212         private function getMemCacheKey() {
 213                 return wfMemcKey( 'apilogin', 'badlogin', 'ip', wfGetIP() );
 214         }
 215
 216         protected function getAllowedParams() {
 217                 return array (
 218                         'name' => null,
 219                         'password' => null,
 220                         'domain' => null
 221                 );
 222         }
 223
 224         protected function getParamDescription() {
 225                 return array (
 226                         'name' => 'User Name',
 227                         'password' => 'Password',
 228                         'domain' => 'Domain (optional)'
 229                 );
 230         }
 231
 232         protected function getDescription() {
 233                 return array (
 234                         'This module is used to login and get the authentication tokens. ',
 235                         'In the event of a successful log-in, a cookie will be attached',
 236                         'to your session. In the event of a failed log-in, you will not ',
 237                         'be able to attempt another log-in through this method for 60 seconds.',
 238                         'This is to prevent password guessing by automated password crackers.'
 239                 );
 240         }
 241
 242         protected function getExamples() {
 243                 return array(
 244                         'api.php?action=login&lgname=user&lgpassword=password'
 245                 );
 246         }
 247
 248         public function getVersion() {
 249                 return __CLASS__ . ': $Id$';
 250         }
 251 }
 252