includes/session/SessionManager.php

   1 <?php
   2 /**
   3  * MediaWiki\Session entry point
   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 MediaWiki\MediaWikiServices;
  27 use MWException;
  28 use Psr\Log\LoggerInterface;
  29 use BagOStuff;
  30 use CachedBagOStuff;
  31 use Config;
  32 use FauxRequest;
  33 use User;
  34 use WebRequest;
  35 use Wikimedia\ObjectFactory;
  36
  37 /**
  38  * This serves as the entry point to the MediaWiki session handling system.
  39  *
  40  * Most methods here are for internal use by session handling code. Other callers
  41  * should only use getGlobalSession and the methods of SessionManagerInterface;
  42  * the rest of the functionality is exposed via MediaWiki\Session\Session methods.
  43  *
  44  * To provide custom session handling, implement a MediaWiki\Session\SessionProvider.
  45  *
  46  * @ingroup Session
  47  * @since 1.27
  48  * @see https://www.mediawiki.org/wiki/Manual:SessionManager_and_AuthManager
  49  */
  50 final class SessionManager implements SessionManagerInterface {
  51         /** @var SessionManager|null */
  52         private static $instance = null;
  53
  54         /** @var Session|null */
  55         private static $globalSession = null;
  56
  57         /** @var WebRequest|null */
  58         private static $globalSessionRequest = null;
  59
  60         /** @var LoggerInterface */
  61         private $logger;
  62
  63         /** @var Config */
  64         private $config;
  65
  66         /** @var CachedBagOStuff|null */
  67         private $store;
  68
  69         /** @var SessionProvider[] */
  70         private $sessionProviders = null;
  71
  72         /** @var string[] */
  73         private $varyCookies = null;
  74
  75         /** @var array */
  76         private $varyHeaders = null;
  77
  78         /** @var SessionBackend[] */
  79         private $allSessionBackends = [];
  80
  81         /** @var SessionId[] */
  82         private $allSessionIds = [];
  83
  84         /** @var string[] */
  85         private $preventUsers = [];
  86
  87         /**
  88          * Get the global SessionManager
  89          * @return self
  90          */
  91         public static function singleton() {
  92                 if ( self::$instance === null ) {
  93                         self::$instance = new self();
  94                 }
  95                 return self::$instance;
  96         }
  97
  98         /**
  99          * Get the "global" session
 100          *
 101          * If PHP's session_id() has been set, returns that session. Otherwise
 102          * returns the session for RequestContext::getMain()->getRequest().
 103          *
 104          * @return Session
 105          */
 106         public static function getGlobalSession() {
 107                 if ( !PHPSessionHandler::isEnabled() ) {
 108                         $id = '';
 109                 } else {
 110                         $id = session_id();
 111                 }
 112
 113                 $request = \RequestContext::getMain()->getRequest();
 114                 if (
 115                         !self::$globalSession // No global session is set up yet
 116                         || self::$globalSessionRequest !== $request // The global WebRequest changed
 117                         || $id !== '' && self::$globalSession->getId() !== $id // Someone messed with session_id()
 118                 ) {
 119                         self::$globalSessionRequest = $request;
 120                         if ( $id === '' ) {
 121                                 // session_id() wasn't used, so fetch the Session from the WebRequest.
 122                                 // We use $request->getSession() instead of $singleton->getSessionForRequest()
 123                                 // because doing the latter would require a public
 124                                 // "$request->getSessionId()" method that would confuse end
 125                                 // users by returning SessionId|null where they'd expect it to
 126                                 // be short for $request->getSession()->getId(), and would
 127                                 // wind up being a duplicate of the code in
 128                                 // $request->getSession() anyway.
 129                                 self::$globalSession = $request->getSession();
 130                         } else {
 131                                 // Someone used session_id(), so we need to follow suit.
 132                                 // Note this overwrites whatever session might already be
 133                                 // associated with $request with the one for $id.
 134                                 self::$globalSession = self::singleton()->getSessionById( $id, true, $request )
 135                                         ?: $request->getSession();
 136                         }
 137                 }
 138                 return self::$globalSession;
 139         }
 140
 141         /**
 142          * @param array $options
 143          *  - config: Config to fetch configuration from. Defaults to the default 'main' config.
 144          *  - logger: LoggerInterface to use for logging. Defaults to the 'session' channel.
 145          *  - store: BagOStuff to store session data in.
 146          */
 147         public function __construct( $options = [] ) {
 148                 if ( isset( $options['config'] ) ) {
 149                         $this->config = $options['config'];
 150                         if ( !$this->config instanceof Config ) {
 151                                 throw new \InvalidArgumentException(
 152                                         '$options[\'config\'] must be an instance of Config'
 153                                 );
 154                         }
 155                 } else {
 156                         $this->config = MediaWikiServices::getInstance()->getMainConfig();
 157                 }
 158
 159                 if ( isset( $options['logger'] ) ) {
 160                         if ( !$options['logger'] instanceof LoggerInterface ) {
 161                                 throw new \InvalidArgumentException(
 162                                         '$options[\'logger\'] must be an instance of LoggerInterface'
 163                                 );
 164                         }
 165                         $this->setLogger( $options['logger'] );
 166                 } else {
 167                         $this->setLogger( \MediaWiki\Logger\LoggerFactory::getInstance( 'session' ) );
 168                 }
 169
 170                 if ( isset( $options['store'] ) ) {
 171                         if ( !$options['store'] instanceof BagOStuff ) {
 172                                 throw new \InvalidArgumentException(
 173                                         '$options[\'store\'] must be an instance of BagOStuff'
 174                                 );
 175                         }
 176                         $store = $options['store'];
 177                 } else {
 178                         $store = \ObjectCache::getInstance( $this->config->get( 'SessionCacheType' ) );
 179                 }
 180                 $this->store = $store instanceof CachedBagOStuff ? $store : new CachedBagOStuff( $store );
 181
 182                 register_shutdown_function( [ $this, 'shutdown' ] );
 183         }
 184
 185         public function setLogger( LoggerInterface $logger ) {
 186                 $this->logger = $logger;
 187         }
 188
 189         public function getSessionForRequest( WebRequest $request ) {
 190                 $info = $this->getSessionInfoForRequest( $request );
 191
 192                 if ( !$info ) {
 193                         $session = $this->getEmptySession( $request );
 194                 } else {
 195                         $session = $this->getSessionFromInfo( $info, $request );
 196                 }
 197                 return $session;
 198         }
 199
 200         public function getSessionById( $id, $create = false, WebRequest $request = null ) {
 201                 if ( !self::validateSessionId( $id ) ) {
 202                         throw new \InvalidArgumentException( 'Invalid session ID' );
 203                 }
 204                 if ( !$request ) {
 205                         $request = new FauxRequest;
 206                 }
 207
 208                 $session = null;
 209                 $info = new SessionInfo( SessionInfo::MIN_PRIORITY, [ 'id' => $id, 'idIsSafe' => true ] );
 210
 211                 // If we already have the backend loaded, use it directly
 212                 if ( isset( $this->allSessionBackends[$id] ) ) {
 213                         return $this->getSessionFromInfo( $info, $request );
 214                 }
 215
 216                 // Test if the session is in storage, and if so try to load it.
 217                 $key = $this->store->makeKey( 'MWSession', $id );
 218                 if ( is_array( $this->store->get( $key ) ) ) {
 219                         $create = false; // If loading fails, don't bother creating because it probably will fail too.
 220                         if ( $this->loadSessionInfoFromStore( $info, $request ) ) {
 221                                 $session = $this->getSessionFromInfo( $info, $request );
 222                         }
 223                 }
 224
 225                 if ( $create && $session === null ) {
 226                         $ex = null;
 227                         try {
 228                                 $session = $this->getEmptySessionInternal( $request, $id );
 229                         } catch ( \Exception $ex ) {
 230                                 $this->logger->error( 'Failed to create empty session: {exception}',
 231                                         [
 232                                                 'method' => __METHOD__,
 233                                                 'exception' => $ex,
 234                                 ] );
 235                                 $session = null;
 236                         }
 237                 }
 238
 239                 return $session;
 240         }
 241
 242         public function getEmptySession( WebRequest $request = null ) {
 243                 return $this->getEmptySessionInternal( $request );
 244         }
 245
 246         /**
 247          * @see SessionManagerInterface::getEmptySession
 248          * @param WebRequest|null $request
 249          * @param string|null $id ID to force on the new session
 250          * @return Session
 251          */
 252         private function getEmptySessionInternal( WebRequest $request = null, $id = null ) {
 253                 if ( $id !== null ) {
 254                         if ( !self::validateSessionId( $id ) ) {
 255                                 throw new \InvalidArgumentException( 'Invalid session ID' );
 256                         }
 257
 258                         $key = $this->store->makeKey( 'MWSession', $id );
 259                         if ( is_array( $this->store->get( $key ) ) ) {
 260                                 throw new \InvalidArgumentException( 'Session ID already exists' );
 261                         }
 262                 }
 263                 if ( !$request ) {
 264                         $request = new FauxRequest;
 265                 }
 266
 267                 $infos = [];
 268                 foreach ( $this->getProviders() as $provider ) {
 269                         $info = $provider->newSessionInfo( $id );
 270                         if ( !$info ) {
 271                                 continue;
 272                         }
 273                         if ( $info->getProvider() !== $provider ) {
 274                                 throw new \UnexpectedValueException(
 275                                         "$provider returned an empty session info for a different provider: $info"
 276                                 );
 277                         }
 278                         if ( $id !== null && $info->getId() !== $id ) {
 279                                 throw new \UnexpectedValueException(
 280                                         "$provider returned empty session info with a wrong id: " .
 281                                                 $info->getId() . ' != ' . $id
 282                                 );
 283                         }
 284                         if ( !$info->isIdSafe() ) {
 285                                 throw new \UnexpectedValueException(
 286                                         "$provider returned empty session info with id flagged unsafe"
 287                                 );
 288                         }
 289                         $compare = $infos ? SessionInfo::compare( $infos[0], $info ) : -1;
 290                         if ( $compare > 0 ) {
 291                                 continue;
 292                         }
 293                         if ( $compare === 0 ) {
 294                                 $infos[] = $info;
 295                         } else {
 296                                 $infos = [ $info ];
 297                         }
 298                 }
 299
 300                 // Make sure there's exactly one
 301                 if ( count( $infos ) > 1 ) {
 302                         throw new \UnexpectedValueException(
 303                                 'Multiple empty sessions tied for top priority: ' . implode( ', ', $infos )
 304                         );
 305                 } elseif ( count( $infos ) < 1 ) {
 306                         throw new \UnexpectedValueException( 'No provider could provide an empty session!' );
 307                 }
 308
 309                 return $this->getSessionFromInfo( $infos[0], $request );
 310         }
 311
 312         public function invalidateSessionsForUser( User $user ) {
 313                 $user->setToken();
 314                 $user->saveSettings();
 315
 316                 foreach ( $this->getProviders() as $provider ) {
 317                         $provider->invalidateSessionsForUser( $user );
 318                 }
 319         }
 320
 321         public function getVaryHeaders() {
 322                 // @codeCoverageIgnoreStart
 323                 // @phan-suppress-next-line PhanUndeclaredConstant
 324                 if ( defined( 'MW_NO_SESSION' ) && MW_NO_SESSION !== 'warn' ) {
 325                         return [];
 326                 }
 327                 // @codeCoverageIgnoreEnd
 328                 if ( $this->varyHeaders === null ) {
 329                         $headers = [];
 330                         foreach ( $this->getProviders() as $provider ) {
 331                                 foreach ( $provider->getVaryHeaders() as $header => $options ) {
 332                                         # Note that the $options value returned has been deprecated
 333                                         # and is ignored.
 334                                         $headers[$header] = null;
 335                                 }
 336                         }
 337                         $this->varyHeaders = $headers;
 338                 }
 339                 return $this->varyHeaders;
 340         }
 341
 342         public function getVaryCookies() {
 343                 // @codeCoverageIgnoreStart
 344                 // @phan-suppress-next-line PhanUndeclaredConstant
 345                 if ( defined( 'MW_NO_SESSION' ) && MW_NO_SESSION !== 'warn' ) {
 346                         return [];
 347                 }
 348                 // @codeCoverageIgnoreEnd
 349                 if ( $this->varyCookies === null ) {
 350                         $cookies = [];
 351                         foreach ( $this->getProviders() as $provider ) {
 352                                 $cookies = array_merge( $cookies, $provider->getVaryCookies() );
 353                         }
 354                         $this->varyCookies = array_values( array_unique( $cookies ) );
 355                 }
 356                 return $this->varyCookies;
 357         }
 358
 359         /**
 360          * Validate a session ID
 361          * @param string $id
 362          * @return bool
 363          */
 364         public static function validateSessionId( $id ) {
 365                 return is_string( $id ) && preg_match( '/^[a-zA-Z0-9_-]{32,}$/', $id );
 366         }
 367
 368         /**
 369          * @name Internal methods
 370          * @{
 371          */
 372
 373         /**
 374          * Prevent future sessions for the user
 375          *
 376          * The intention is that the named account will never again be usable for
 377          * normal login (i.e. there is no way to undo the prevention of access).
 378          *
 379          * @private For use from \User::newSystemUser only
 380          * @param string $username
 381          */
 382         public function preventSessionsForUser( $username ) {
 383                 $this->preventUsers[$username] = true;
 384
 385                 // Instruct the session providers to kill any other sessions too.
 386                 foreach ( $this->getProviders() as $provider ) {
 387                         $provider->preventSessionsForUser( $username );
 388                 }
 389         }
 390
 391         /**
 392          * Test if a user is prevented
 393          * @private For use from SessionBackend only
 394          * @param string $username
 395          * @return bool
 396          */
 397         public function isUserSessionPrevented( $username ) {
 398                 return !empty( $this->preventUsers[$username] );
 399         }
 400
 401         /**
 402          * Get the available SessionProviders
 403          * @return SessionProvider[]
 404          */
 405         protected function getProviders() {
 406                 if ( $this->sessionProviders === null ) {
 407                         $this->sessionProviders = [];
 408                         foreach ( $this->config->get( 'SessionProviders' ) as $spec ) {
 409                                 $provider = ObjectFactory::getObjectFromSpec( $spec );
 410                                 $provider->setLogger( $this->logger );
 411                                 $provider->setConfig( $this->config );
 412                                 $provider->setManager( $this );
 413                                 if ( isset( $this->sessionProviders[(string)$provider] ) ) {
 414                                         // @phan-suppress-next-line PhanTypeSuspiciousStringExpression
 415                                         throw new \UnexpectedValueException( "Duplicate provider name \"$provider\"" );
 416                                 }
 417                                 $this->sessionProviders[(string)$provider] = $provider;
 418                         }
 419                 }
 420                 return $this->sessionProviders;
 421         }
 422
 423         /**
 424          * Get a session provider by name
 425          *
 426          * Generally, this will only be used by internal implementation of some
 427          * special session-providing mechanism. General purpose code, if it needs
 428          * to access a SessionProvider at all, will use Session::getProvider().
 429          *
 430          * @param string $name
 431          * @return SessionProvider|null
 432          */
 433         public function getProvider( $name ) {
 434                 $providers = $this->getProviders();
 435                 return $providers[$name] ?? null;
 436         }
 437
 438         /**
 439          * Save all active sessions on shutdown
 440          * @private For internal use with register_shutdown_function()
 441          */
 442         public function shutdown() {
 443                 if ( $this->allSessionBackends ) {
 444                         $this->logger->debug( 'Saving all sessions on shutdown' );
 445                         if ( session_id() !== '' ) {
 446                                 // @codeCoverageIgnoreStart
 447                                 session_write_close();
 448                         }
 449                         // @codeCoverageIgnoreEnd
 450                         foreach ( $this->allSessionBackends as $backend ) {
 451                                 $backend->shutdown();
 452                         }
 453                 }
 454         }
 455
 456         /**
 457          * Fetch the SessionInfo(s) for a request
 458          * @param WebRequest $request
 459          * @return SessionInfo|null
 460          */
 461         private function getSessionInfoForRequest( WebRequest $request ) {
 462                 // Call all providers to fetch "the" session
 463                 $infos = [];
 464                 foreach ( $this->getProviders() as $provider ) {
 465                         $info = $provider->provideSessionInfo( $request );
 466                         if ( !$info ) {
 467                                 continue;
 468                         }
 469                         if ( $info->getProvider() !== $provider ) {
 470                                 throw new \UnexpectedValueException(
 471                                         "$provider returned session info for a different provider: $info"
 472                                 );
 473                         }
 474                         $infos[] = $info;
 475                 }
 476
 477                 // Sort the SessionInfos. Then find the first one that can be
 478                 // successfully loaded, and then all the ones after it with the same
 479                 // priority.
 480                 usort( $infos, 'MediaWiki\\Session\\SessionInfo::compare' );
 481                 $retInfos = [];
 482                 while ( $infos ) {
 483                         $info = array_pop( $infos );
 484                         if ( $this->loadSessionInfoFromStore( $info, $request ) ) {
 485                                 $retInfos[] = $info;
 486                                 while ( $infos ) {
 487                                         $info = array_pop( $infos );
 488                                         if ( SessionInfo::compare( $retInfos[0], $info ) ) {
 489                                                 // We hit a lower priority, stop checking.
 490                                                 break;
 491                                         }
 492                                         if ( $this->loadSessionInfoFromStore( $info, $request ) ) {
 493                                                 // This is going to error out below, but we want to
 494                                                 // provide a complete list.
 495                                                 $retInfos[] = $info;
 496                                         } else {
 497                                                 // Session load failed, so unpersist it from this request
 498                                                 $info->getProvider()->unpersistSession( $request );
 499                                         }
 500                                 }
 501                         } else {
 502                                 // Session load failed, so unpersist it from this request
 503                                 $info->getProvider()->unpersistSession( $request );
 504                         }
 505                 }
 506
 507                 if ( count( $retInfos ) > 1 ) {
 508                         $ex = new \OverflowException(
 509                                 'Multiple sessions for this request tied for top priority: ' . implode( ', ', $retInfos )
 510                         );
 511                         $ex->sessionInfos = $retInfos;
 512                         throw $ex;
 513                 }
 514
 515                 return $retInfos ? $retInfos[0] : null;
 516         }
 517
 518         /**
 519          * Load and verify the session info against the store
 520          *
 521          * @param SessionInfo &$info Will likely be replaced with an updated SessionInfo instance
 522          * @param WebRequest $request
 523          * @return bool Whether the session info matches the stored data (if any)
 524          */
 525         private function loadSessionInfoFromStore( SessionInfo &$info, WebRequest $request ) {
 526                 $key = $this->store->makeKey( 'MWSession', $info->getId() );
 527                 $blob = $this->store->get( $key );
 528
 529                 // If we got data from the store and the SessionInfo says to force use,
 530                 // "fail" means to delete the data from the store and retry. Otherwise,
 531                 // "fail" is just return false.
 532                 if ( $info->forceUse() && $blob !== false ) {
 533                         $failHandler = function () use ( $key, &$info, $request ) {
 534                                 $this->store->delete( $key );
 535                                 return $this->loadSessionInfoFromStore( $info, $request );
 536                         };
 537                 } else {
 538                         $failHandler = function () {
 539                                 return false;
 540                         };
 541                 }
 542
 543                 $newParams = [];
 544
 545                 if ( $blob !== false ) {
 546                         // Sanity check: blob must be an array, if it's saved at all
 547                         if ( !is_array( $blob ) ) {
 548                                 $this->logger->warning( 'Session "{session}": Bad data', [
 549                                         'session' => $info,
 550                                 ] );
 551                                 $this->store->delete( $key );
 552                                 return $failHandler();
 553                         }
 554
 555                         // Sanity check: blob has data and metadata arrays
 556                         if ( !isset( $blob['data'] ) || !is_array( $blob['data'] ) ||
 557                                 !isset( $blob['metadata'] ) || !is_array( $blob['metadata'] )
 558                         ) {
 559                                 $this->logger->warning( 'Session "{session}": Bad data structure', [
 560                                         'session' => $info,
 561                                 ] );
 562                                 $this->store->delete( $key );
 563                                 return $failHandler();
 564                         }
 565
 566                         $data = $blob['data'];
 567                         $metadata = $blob['metadata'];
 568
 569                         // Sanity check: metadata must be an array and must contain certain
 570                         // keys, if it's saved at all
 571                         if ( !array_key_exists( 'userId', $metadata ) ||
 572                                 !array_key_exists( 'userName', $metadata ) ||
 573                                 !array_key_exists( 'userToken', $metadata ) ||
 574                                 !array_key_exists( 'provider', $metadata )
 575                         ) {
 576                                 $this->logger->warning( 'Session "{session}": Bad metadata', [
 577                                         'session' => $info,
 578                                 ] );
 579                                 $this->store->delete( $key );
 580                                 return $failHandler();
 581                         }
 582
 583                         // First, load the provider from metadata, or validate it against the metadata.
 584                         $provider = $info->getProvider();
 585                         if ( $provider === null ) {
 586                                 $newParams['provider'] = $provider = $this->getProvider( $metadata['provider'] );
 587                                 if ( !$provider ) {
 588                                         $this->logger->warning(
 589                                                 'Session "{session}": Unknown provider ' . $metadata['provider'],
 590                                                 [
 591                                                         'session' => $info,
 592                                                 ]
 593                                         );
 594                                         $this->store->delete( $key );
 595                                         return $failHandler();
 596                                 }
 597                         } elseif ( $metadata['provider'] !== (string)$provider ) {
 598                                 $this->logger->warning( 'Session "{session}": Wrong provider ' .
 599                                         $metadata['provider'] . ' !== ' . $provider,
 600                                         [
 601                                                 'session' => $info,
 602                                 ] );
 603                                 return $failHandler();
 604                         }
 605
 606                         // Load provider metadata from metadata, or validate it against the metadata
 607                         $providerMetadata = $info->getProviderMetadata();
 608                         if ( isset( $metadata['providerMetadata'] ) ) {
 609                                 if ( $providerMetadata === null ) {
 610                                         $newParams['metadata'] = $metadata['providerMetadata'];
 611                                 } else {
 612                                         try {
 613                                                 $newProviderMetadata = $provider->mergeMetadata(
 614                                                         $metadata['providerMetadata'], $providerMetadata
 615                                                 );
 616                                                 if ( $newProviderMetadata !== $providerMetadata ) {
 617                                                         $newParams['metadata'] = $newProviderMetadata;
 618                                                 }
 619                                         } catch ( MetadataMergeException $ex ) {
 620                                                 $this->logger->warning(
 621                                                         'Session "{session}": Metadata merge failed: {exception}',
 622                                                         [
 623                                                                 'session' => $info,
 624                                                                 'exception' => $ex,
 625                                                         ] + $ex->getContext()
 626                                                 );
 627                                                 return $failHandler();
 628                                         }
 629                                 }
 630                         }
 631
 632                         // Next, load the user from metadata, or validate it against the metadata.
 633                         $userInfo = $info->getUserInfo();
 634                         if ( !$userInfo ) {
 635                                 // For loading, id is preferred to name.
 636                                 try {
 637                                         if ( $metadata['userId'] ) {
 638                                                 $userInfo = UserInfo::newFromId( $metadata['userId'] );
 639                                         } elseif ( $metadata['userName'] !== null ) { // Shouldn't happen, but just in case
 640                                                 $userInfo = UserInfo::newFromName( $metadata['userName'] );
 641                                         } else {
 642                                                 $userInfo = UserInfo::newAnonymous();
 643                                         }
 644                                 } catch ( \InvalidArgumentException $ex ) {
 645                                         $this->logger->error( 'Session "{session}": {exception}', [
 646                                                 'session' => $info,
 647                                                 'exception' => $ex,
 648                                         ] );
 649                                         return $failHandler();
 650                                 }
 651                                 $newParams['userInfo'] = $userInfo;
 652                         } else {
 653                                 // User validation passes if user ID matches, or if there
 654                                 // is no saved ID and the names match.
 655                                 if ( $metadata['userId'] ) {
 656                                         if ( $metadata['userId'] !== $userInfo->getId() ) {
 657                                                 $this->logger->warning(
 658                                                         'Session "{session}": User ID mismatch, {uid_a} !== {uid_b}',
 659                                                         [
 660                                                                 'session' => $info,
 661                                                                 'uid_a' => $metadata['userId'],
 662                                                                 'uid_b' => $userInfo->getId(),
 663                                                 ] );
 664                                                 return $failHandler();
 665                                         }
 666
 667                                         // If the user was renamed, probably best to fail here.
 668                                         if ( $metadata['userName'] !== null &&
 669                                                 $userInfo->getName() !== $metadata['userName']
 670                                         ) {
 671                                                 $this->logger->warning(
 672                                                         'Session "{session}": User ID matched but name didn\'t (rename?), {uname_a} !== {uname_b}',
 673                                                         [
 674                                                                 'session' => $info,
 675                                                                 'uname_a' => $metadata['userName'],
 676                                                                 'uname_b' => $userInfo->getName(),
 677                                                 ] );
 678                                                 return $failHandler();
 679                                         }
 680
 681                                 } elseif ( $metadata['userName'] !== null ) { // Shouldn't happen, but just in case
 682                                         if ( $metadata['userName'] !== $userInfo->getName() ) {
 683                                                 $this->logger->warning(
 684                                                         'Session "{session}": User name mismatch, {uname_a} !== {uname_b}',
 685                                                         [
 686                                                                 'session' => $info,
 687                                                                 'uname_a' => $metadata['userName'],
 688                                                                 'uname_b' => $userInfo->getName(),
 689                                                 ] );
 690                                                 return $failHandler();
 691                                         }
 692                                 } elseif ( !$userInfo->isAnon() ) {
 693                                         // Metadata specifies an anonymous user, but the passed-in
 694                                         // user isn't anonymous.
 695                                         $this->logger->warning(
 696                                                 'Session "{session}": Metadata has an anonymous user, but a non-anon user was provided',
 697                                                 [
 698                                                         'session' => $info,
 699                                         ] );
 700                                         return $failHandler();
 701                                 }
 702                         }
 703
 704                         // And if we have a token in the metadata, it must match the loaded/provided user.
 705                         if ( $metadata['userToken'] !== null &&
 706                                 $userInfo->getToken() !== $metadata['userToken']
 707                         ) {
 708                                 $this->logger->warning( 'Session "{session}": User token mismatch', [
 709                                         'session' => $info,
 710                                 ] );
 711                                 return $failHandler();
 712                         }
 713                         if ( !$userInfo->isVerified() ) {
 714                                 $newParams['userInfo'] = $userInfo->verified();
 715                         }
 716
 717                         if ( !empty( $metadata['remember'] ) && !$info->wasRemembered() ) {
 718                                 $newParams['remembered'] = true;
 719                         }
 720                         if ( !empty( $metadata['forceHTTPS'] ) && !$info->forceHTTPS() ) {
 721                                 $newParams['forceHTTPS'] = true;
 722                         }
 723                         if ( !empty( $metadata['persisted'] ) && !$info->wasPersisted() ) {
 724                                 $newParams['persisted'] = true;
 725                         }
 726
 727                         if ( !$info->isIdSafe() ) {
 728                                 $newParams['idIsSafe'] = true;
 729                         }
 730                 } else {
 731                         // No metadata, so we can't load the provider if one wasn't given.
 732                         if ( $info->getProvider() === null ) {
 733                                 $this->logger->warning(
 734                                         'Session "{session}": Null provider and no metadata',
 735                                         [
 736                                                 'session' => $info,
 737                                 ] );
 738                                 return $failHandler();
 739                         }
 740
 741                         // If no user was provided and no metadata, it must be anon.
 742                         if ( !$info->getUserInfo() ) {
 743                                 if ( $info->getProvider()->canChangeUser() ) {
 744                                         $newParams['userInfo'] = UserInfo::newAnonymous();
 745                                 } else {
 746                                         $this->logger->info(
 747                                                 'Session "{session}": No user provided and provider cannot set user',
 748                                                 [
 749                                                         'session' => $info,
 750                                         ] );
 751                                         return $failHandler();
 752                                 }
 753                         } elseif ( !$info->getUserInfo()->isVerified() ) {
 754                                 // probably just a session timeout
 755                                 $this->logger->info(
 756                                         'Session "{session}": Unverified user provided and no metadata to auth it',
 757                                         [
 758                                                 'session' => $info,
 759                                 ] );
 760                                 return $failHandler();
 761                         }
 762
 763                         $data = false;
 764                         $metadata = false;
 765
 766                         if ( !$info->getProvider()->persistsSessionId() && !$info->isIdSafe() ) {
 767                                 // The ID doesn't come from the user, so it should be safe
 768                                 // (and if not, nothing we can do about it anyway)
 769                                 $newParams['idIsSafe'] = true;
 770                         }
 771                 }
 772
 773                 // Construct the replacement SessionInfo, if necessary
 774                 if ( $newParams ) {
 775                         $newParams['copyFrom'] = $info;
 776                         $info = new SessionInfo( $info->getPriority(), $newParams );
 777                 }
 778
 779                 // Allow the provider to check the loaded SessionInfo
 780                 $providerMetadata = $info->getProviderMetadata();
 781                 if ( !$info->getProvider()->refreshSessionInfo( $info, $request, $providerMetadata ) ) {
 782                         return $failHandler();
 783                 }
 784                 if ( $providerMetadata !== $info->getProviderMetadata() ) {
 785                         $info = new SessionInfo( $info->getPriority(), [
 786                                 'metadata' => $providerMetadata,
 787                                 'copyFrom' => $info,
 788                         ] );
 789                 }
 790
 791                 // Give hooks a chance to abort. Combined with the SessionMetadata
 792                 // hook, this can allow for tying a session to an IP address or the
 793                 // like.
 794                 $reason = 'Hook aborted';
 795                 if ( !\Hooks::run(
 796                         'SessionCheckInfo',
 797                         [ &$reason, $info, $request, $metadata, $data ]
 798                 ) ) {
 799                         $this->logger->warning( 'Session "{session}": ' . $reason, [
 800                                 'session' => $info,
 801                         ] );
 802                         return $failHandler();
 803                 }
 804
 805                 return true;
 806         }
 807
 808         /**
 809          * Create a Session corresponding to the passed SessionInfo
 810          * @private For use by a SessionProvider that needs to specially create its
 811          *  own Session. Most session providers won't need this.
 812          * @param SessionInfo $info
 813          * @param WebRequest $request
 814          * @return Session
 815          */
 816         public function getSessionFromInfo( SessionInfo $info, WebRequest $request ) {
 817                 // @codeCoverageIgnoreStart
 818                 if ( defined( 'MW_NO_SESSION' ) ) {
 819                         // @phan-suppress-next-line PhanUndeclaredConstant
 820                         if ( MW_NO_SESSION === 'warn' ) {
 821                                 // Undocumented safety case for converting existing entry points
 822                                 $this->logger->error( 'Sessions are supposed to be disabled for this entry point', [
 823                                         'exception' => new \BadMethodCallException( 'Sessions are disabled for this entry point' ),
 824                                 ] );
 825                         } else {
 826                                 throw new \BadMethodCallException( 'Sessions are disabled for this entry point' );
 827                         }
 828                 }
 829                 // @codeCoverageIgnoreEnd
 830
 831                 $id = $info->getId();
 832
 833                 if ( !isset( $this->allSessionBackends[$id] ) ) {
 834                         if ( !isset( $this->allSessionIds[$id] ) ) {
 835                                 $this->allSessionIds[$id] = new SessionId( $id );
 836                         }
 837                         $backend = new SessionBackend(
 838                                 $this->allSessionIds[$id],
 839                                 $info,
 840                                 $this->store,
 841                                 $this->logger,
 842                                 $this->config->get( 'ObjectCacheSessionExpiry' )
 843                         );
 844                         $this->allSessionBackends[$id] = $backend;
 845                         $delay = $backend->delaySave();
 846                 } else {
 847                         $backend = $this->allSessionBackends[$id];
 848                         $delay = $backend->delaySave();
 849                         if ( $info->wasPersisted() ) {
 850                                 $backend->persist();
 851                         }
 852                         if ( $info->wasRemembered() ) {
 853                                 $backend->setRememberUser( true );
 854                         }
 855                 }
 856
 857                 $request->setSessionId( $backend->getSessionId() );
 858                 $session = $backend->getSession( $request );
 859
 860                 if ( !$info->isIdSafe() ) {
 861                         $session->resetId();
 862                 }
 863
 864                 \Wikimedia\ScopedCallback::consume( $delay );
 865                 return $session;
 866         }
 867
 868         /**
 869          * Deregister a SessionBackend
 870          * @private For use from \MediaWiki\Session\SessionBackend only
 871          * @param SessionBackend $backend
 872          */
 873         public function deregisterSessionBackend( SessionBackend $backend ) {
 874                 $id = $backend->getId();
 875                 if ( !isset( $this->allSessionBackends[$id] ) || !isset( $this->allSessionIds[$id] ) ||
 876                         $this->allSessionBackends[$id] !== $backend ||
 877                         $this->allSessionIds[$id] !== $backend->getSessionId()
 878                 ) {
 879                         throw new \InvalidArgumentException( 'Backend was not registered with this SessionManager' );
 880                 }
 881
 882                 unset( $this->allSessionBackends[$id] );
 883                 // Explicitly do not unset $this->allSessionIds[$id]
 884         }
 885
 886         /**
 887          * Change a SessionBackend's ID
 888          * @private For use from \MediaWiki\Session\SessionBackend only
 889          * @param SessionBackend $backend
 890          */
 891         public function changeBackendId( SessionBackend $backend ) {
 892                 $sessionId = $backend->getSessionId();
 893                 $oldId = (string)$sessionId;
 894                 if ( !isset( $this->allSessionBackends[$oldId] ) || !isset( $this->allSessionIds[$oldId] ) ||
 895                         $this->allSessionBackends[$oldId] !== $backend ||
 896                         $this->allSessionIds[$oldId] !== $sessionId
 897                 ) {
 898                         throw new \InvalidArgumentException( 'Backend was not registered with this SessionManager' );
 899                 }
 900
 901                 $newId = $this->generateSessionId();
 902
 903                 unset( $this->allSessionBackends[$oldId], $this->allSessionIds[$oldId] );
 904                 $sessionId->setId( $newId );
 905                 $this->allSessionBackends[$newId] = $backend;
 906                 $this->allSessionIds[$newId] = $sessionId;
 907         }
 908
 909         /**
 910          * Generate a new random session ID
 911          * @return string
 912          */
 913         public function generateSessionId() {
 914                 do {
 915                         $id = \Wikimedia\base_convert( \MWCryptRand::generateHex( 40 ), 16, 32, 32 );
 916                         $key = $this->store->makeKey( 'MWSession', $id );
 917                 } while ( isset( $this->allSessionIds[$id] ) || is_array( $this->store->get( $key ) ) );
 918                 return $id;
 919         }
 920
 921         /**
 922          * Call setters on a PHPSessionHandler
 923          * @private Use PhpSessionHandler::install()
 924          * @param PHPSessionHandler $handler
 925          */
 926         public function setupPHPSessionHandler( PHPSessionHandler $handler ) {
 927                 $handler->setManager( $this, $this->store, $this->logger );
 928         }
 929
 930         /**
 931          * Reset the internal caching for unit testing
 932          * @protected Unit tests only
 933          */
 934         public static function resetCache() {
 935                 if ( !defined( 'MW_PHPUNIT_TEST' ) ) {
 936                         // @codeCoverageIgnoreStart
 937                         throw new MWException( __METHOD__ . ' may only be called from unit tests!' );
 938                         // @codeCoverageIgnoreEnd
 939                 }
 940
 941                 self::$globalSession = null;
 942                 self::$globalSessionRequest = null;
 943         }
 944
 945         /** @} */
 946
 947 }