includes/session/BotPasswordSessionProvider.php

   1 <?php
   2 /**
   3  * Session provider for bot passwords
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Session
  22  */
  23
  24 namespace MediaWiki\Session;
  25
  26 use BotPassword;
  27 use User;
  28 use WebRequest;
  29
  30 /**
  31  * Session provider for bot passwords
  32  * @since 1.27
  33  */
  34 class BotPasswordSessionProvider extends ImmutableSessionProviderWithCookie {
  35
  36         /**
  37          * @param array $params Keys include:
  38          *  - priority: (required) Set the priority
  39          *  - sessionCookieName: Session cookie name. Default is '_BPsession'.
  40          *  - sessionCookieOptions: Options to pass to WebResponse::setCookie().
  41          */
  42         public function __construct( array $params = array() ) {
  43                 if ( !isset( $params['sessionCookieName'] ) ) {
  44                         $params['sessionCookieName'] = '_BPsession';
  45                 }
  46                 parent::__construct( $params );
  47
  48                 if ( !isset( $params['priority'] ) ) {
  49                         throw new \InvalidArgumentException( __METHOD__ . ': priority must be specified' );
  50                 }
  51                 if ( $params['priority'] < SessionInfo::MIN_PRIORITY ||
  52                         $params['priority'] > SessionInfo::MAX_PRIORITY
  53                 ) {
  54                         throw new \InvalidArgumentException( __METHOD__ . ': Invalid priority' );
  55                 }
  56
  57                 $this->priority = $params['priority'];
  58         }
  59
  60         public function provideSessionInfo( WebRequest $request ) {
  61                 // Only relevant for the API
  62                 if ( !defined( 'MW_API' ) ) {
  63                         return null;
  64                 }
  65
  66                 // Enabled?
  67                 if ( !$this->config->get( 'EnableBotPasswords' ) ) {
  68                         return null;
  69                 }
  70
  71                 // Have a session ID?
  72                 $id = $this->getSessionIdFromCookie( $request );
  73                 if ( $id === null ) {
  74                         return null;
  75                 }
  76
  77                 return new SessionInfo( $this->priority, array(
  78                         'provider' => $this,
  79                         'id' => $id,
  80                         'persisted' => true
  81                 ) );
  82         }
  83
  84         public function newSessionInfo( $id = null ) {
  85                 // We don't activate by default
  86                 return null;
  87         }
  88
  89         /**
  90          * Create a new session for a request
  91          * @param User $user
  92          * @param BotPassword $bp
  93          * @param WebRequest $request
  94          * @return Session
  95          */
  96         public function newSessionForRequest( User $user, BotPassword $bp, WebRequest $request ) {
  97                 $id = $this->getSessionIdFromCookie( $request );
  98                 $info = new SessionInfo( SessionInfo::MAX_PRIORITY, array(
  99                         'provider' => $this,
 100                         'id' => $id,
 101                         'userInfo' => UserInfo::newFromUser( $user, true ),
 102                         'persisted' => $id !== null,
 103                         'metadata' => array(
 104                                 'centralId' => $bp->getUserCentralId(),
 105                                 'appId' => $bp->getAppId(),
 106                                 'token' => $bp->getToken(),
 107                                 'rights' => \MWGrants::getGrantRights( $bp->getGrants() ),
 108                         ),
 109                 ) );
 110                 $session = $this->getManager()->getSessionFromInfo( $info, $request );
 111                 $session->persist();
 112                 return $session;
 113         }
 114
 115         public function refreshSessionInfo( SessionInfo $info, WebRequest $request, &$metadata ) {
 116                 $missingKeys = array_diff(
 117                         array( 'centralId', 'appId', 'token' ),
 118                         array_keys( $metadata )
 119                 );
 120                 if ( $missingKeys ) {
 121                         $this->logger->info( 'Session "{session}": Missing metadata: {missing}', array(
 122                                 'session' => $info,
 123                                 'missing' => join( ', ', $missingKeys ),
 124                         ) );
 125                         return false;
 126                 }
 127
 128                 $bp = BotPassword::newFromCentralId( $metadata['centralId'], $metadata['appId'] );
 129                 if ( !$bp ) {
 130                         $this->logger->info(
 131                                 'Session "{session}": No BotPassword for {centralId} {appId}',
 132                                 array(
 133                                         'session' => $info,
 134                                         'centralId' => $metadata['centralId'],
 135                                         'appId' => $metadata['appId'],
 136                         ) );
 137                         return false;
 138                 }
 139
 140                 if ( !hash_equals( $metadata['token'], $bp->getToken() ) ) {
 141                         $this->logger->info( 'Session "{session}": BotPassword token check failed', array(
 142                                 'session' => $info,
 143                                 'centralId' => $metadata['centralId'],
 144                                 'appId' => $metadata['appId'],
 145                         ) );
 146                         return false;
 147                 }
 148
 149                 $status = $bp->getRestrictions()->check( $request );
 150                 if ( !$status->isOk() ) {
 151                         $this->logger->info(
 152                                 'Session "{session}": Restrictions check failed',
 153                                 array(
 154                                         'session' => $info,
 155                                         'restrictions' => $status->getValue(),
 156                                         'centralId' => $metadata['centralId'],
 157                                         'appId' => $metadata['appId'],
 158                         ) );
 159                         return false;
 160                 }
 161
 162                 // Update saved rights
 163                 $metadata['rights'] = \MWGrants::getGrantRights( $bp->getGrants() );
 164
 165                 return true;
 166         }
 167
 168         public function preventSessionsForUser( $username ) {
 169                 BotPassword::removeAllPasswordsForUser( $username );
 170         }
 171
 172         public function getAllowedUserRights( SessionBackend $backend ) {
 173                 if ( $backend->getProvider() !== $this ) {
 174                         throw new InvalidArgumentException( 'Backend\'s provider isn\'t $this' );
 175                 }
 176                 $data = $backend->getProviderMetadata();
 177                 if ( $data ) {
 178                         return $data['rights'];
 179                 }
 180
 181                 // Should never happen
 182                 $this->logger->debug( __METHOD__ . ': No provider metadata, returning no rights allowed' );
 183                 return array();
 184         }
 185 }