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<?php
/**
* Session storage in object cache.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Session
*/
namespace MediaWiki\Session;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use Psr\Log\LoggerInterface;
use Psr\Log\NullLogger;
use SessionHandlerInterface;
use Wikimedia\AtEase\AtEase;
use Wikimedia\ObjectCache\BagOStuff;
use Wikimedia\PhpSessionSerializer;
/**
* Adapter for PHP's session handling
* @ingroup Session
* @since 1.27
*/
class PHPSessionHandler implements SessionHandlerInterface {
/** @var PHPSessionHandler */
protected static $instance = null;
/** @var bool Whether PHP session handling is enabled */
protected $enable = false;
/** @var bool */
protected $warn = true;
protected ?SessionManagerInterface $manager = null;
protected ?BagOStuff $store = null;
protected LoggerInterface $logger;
/** @var array Track original session fields for later modification check */
protected $sessionFieldCache = [];
protected function __construct( SessionManager $manager ) {
$this->setEnableFlags(
MediaWikiServices::getInstance()->getMainConfig()->get( MainConfigNames::PHPSessionHandling )
);
$manager->setupPHPSessionHandler( $this );
}
/**
* Set $this->enable and $this->warn
*
* Separate just because there doesn't seem to be a good way to test it
* otherwise.
*
* @param string $PHPSessionHandling See $wgPHPSessionHandling
*/
private function setEnableFlags( $PHPSessionHandling ) {
switch ( $PHPSessionHandling ) {
case 'enable':
$this->enable = true;
$this->warn = false;
break;
case 'warn':
$this->enable = true;
$this->warn = true;
break;
case 'disable':
$this->enable = false;
$this->warn = false;
break;
}
}
/**
* Test whether the handler is installed
* @return bool
*/
public static function isInstalled() {
return (bool)self::$instance;
}
/**
* Test whether the handler is installed and enabled
* @return bool
*/
public static function isEnabled() {
return self::$instance && self::$instance->enable;
}
/**
* Install a session handler for the current web request
*/
public static function install( SessionManager $manager ) {
if ( self::$instance ) {
$manager->setupPHPSessionHandler( self::$instance );
return;
}
// @codeCoverageIgnoreStart
if ( defined( 'MW_NO_SESSION_HANDLER' ) ) {
throw new \BadMethodCallException( 'MW_NO_SESSION_HANDLER is defined' );
}
// @codeCoverageIgnoreEnd
self::$instance = new self( $manager );
// Close any auto-started session, before we replace it
session_write_close();
try {
AtEase::suppressWarnings();
// Tell PHP not to mess with cookies itself
ini_set( 'session.use_cookies', 0 );
// T124510: Disable automatic PHP session related cache headers.
// MediaWiki adds its own headers and the default PHP behavior may
// set headers such as 'Pragma: no-cache' that cause problems with
// some user agents.
session_cache_limiter( '' );
// Also set a serialization handler
PhpSessionSerializer::setSerializeHandler();
// Register this as the save handler, and register an appropriate
// shutdown function.
session_set_save_handler( self::$instance, true );
} finally {
AtEase::restoreWarnings();
}
}
/**
* Set the manager, store, and logger
* @internal Use self::install().
* @param SessionManagerInterface $manager
* @param BagOStuff $store
* @param LoggerInterface $logger
*/
public function setManager(
SessionManagerInterface $manager, BagOStuff $store, LoggerInterface $logger
) {
if ( $this->manager !== $manager ) {
// Close any existing session before we change stores
if ( $this->manager ) {
session_write_close();
}
$this->manager = $manager;
$this->store = $store;
$this->logger = $logger;
PhpSessionSerializer::setLogger( $this->logger );
}
}
/**
* Initialize the session (handler)
* @internal For internal use only
* @param string $save_path Path used to store session files (ignored)
* @param string $session_name Session name (ignored)
* @return true
*/
#[\ReturnTypeWillChange]
public function open( $save_path, $session_name ) {
if ( self::$instance !== $this ) {
throw new \UnexpectedValueException( __METHOD__ . ': Wrong instance called!' );
}
if ( !$this->enable ) {
throw new \BadMethodCallException( 'Attempt to use PHP session management' );
}
return true;
}
/**
* Close the session (handler)
* @internal For internal use only
* @return true
*/
#[\ReturnTypeWillChange]
public function close() {
if ( self::$instance !== $this ) {
throw new \UnexpectedValueException( __METHOD__ . ': Wrong instance called!' );
}
$this->sessionFieldCache = [];
return true;
}
/**
* Read session data
* @internal For internal use only
* @param string $id Session id
* @return string Session data
*/
#[\ReturnTypeWillChange]
public function read( $id ) {
if ( self::$instance !== $this ) {
throw new \UnexpectedValueException( __METHOD__ . ': Wrong instance called!' );
}
if ( !$this->enable ) {
throw new \BadMethodCallException( 'Attempt to use PHP session management' );
}
$session = $this->manager->getSessionById( $id, false );
if ( !$session ) {
return '';
}
$session->persist();
$data = iterator_to_array( $session );
$this->sessionFieldCache[$id] = $data;
return (string)PhpSessionSerializer::encode( $data );
}
/**
* Write session data
* @internal For internal use only
* @param string $id Session id
* @param string $dataStr Session data. Not that you should ever call this
* directly, but note that this has the same issues with code injection
* via user-controlled data as does PHP's unserialize function.
* @return bool
*/
#[\ReturnTypeWillChange]
public function write( $id, $dataStr ) {
if ( self::$instance !== $this ) {
throw new \UnexpectedValueException( __METHOD__ . ': Wrong instance called!' );
}
if ( !$this->enable ) {
throw new \BadMethodCallException( 'Attempt to use PHP session management' );
}
$session = $this->manager->getSessionById( $id, true );
if ( !$session ) {
// This can happen under normal circumstances, if the session exists but is
// invalid. Let's emit a log warning instead of a PHP warning.
$this->logger->warning(
__METHOD__ . ': Session "{session}" cannot be loaded, skipping write.',
[
'session' => $id,
] );
return true;
}
// First, decode the string PHP handed us
$data = PhpSessionSerializer::decode( $dataStr );
if ( $data === null ) {
// @codeCoverageIgnoreStart
return false;
// @codeCoverageIgnoreEnd
}
// Now merge the data into the Session object.
$changed = false;
$cache = $this->sessionFieldCache[$id] ?? [];
foreach ( $data as $key => $value ) {
if ( !array_key_exists( $key, $cache ) ) {
if ( $session->exists( $key ) ) {
// New in both, so ignore and log
$this->logger->warning(
__METHOD__ . ": Key \"$key\" added in both Session and \$_SESSION!"
);
} else {
// New in $_SESSION, keep it
$session->set( $key, $value );
$changed = true;
}
} elseif ( $cache[$key] === $value ) {
// Unchanged in $_SESSION, so ignore it
} elseif ( !$session->exists( $key ) ) {
// Deleted in Session, keep but log
$this->logger->warning(
__METHOD__ . ": Key \"$key\" deleted in Session and changed in \$_SESSION!"
);
$session->set( $key, $value );
$changed = true;
} elseif ( $cache[$key] === $session->get( $key ) ) {
// Unchanged in Session, so keep it
$session->set( $key, $value );
$changed = true;
} else {
// Changed in both, so ignore and log
$this->logger->warning(
__METHOD__ . ": Key \"$key\" changed in both Session and \$_SESSION!"
);
}
}
// Anything deleted in $_SESSION and unchanged in Session should be deleted too
// (but not if $_SESSION can't represent it at all)
PhpSessionSerializer::setLogger( new NullLogger() );
foreach ( $cache as $key => $value ) {
if ( !array_key_exists( $key, $data ) && $session->exists( $key ) &&
PhpSessionSerializer::encode( [ $key => true ] )
) {
if ( $value === $session->get( $key ) ) {
// Unchanged in Session, delete it
$session->remove( $key );
$changed = true;
} else {
// Changed in Session, ignore deletion and log
$this->logger->warning(
__METHOD__ . ": Key \"$key\" changed in Session and deleted in \$_SESSION!"
);
}
}
}
PhpSessionSerializer::setLogger( $this->logger );
// Save and update cache if anything changed
if ( $changed ) {
if ( $this->warn ) {
wfDeprecated( '$_SESSION', '1.27' );
$this->logger->warning( 'Something wrote to $_SESSION!' );
}
$session->save();
$this->sessionFieldCache[$id] = iterator_to_array( $session );
}
$session->persist();
return true;
}
/**
* Destroy a session
* @internal For internal use only
* @param string $id Session id
* @return true
*/
#[\ReturnTypeWillChange]
public function destroy( $id ) {
if ( self::$instance !== $this ) {
throw new \UnexpectedValueException( __METHOD__ . ': Wrong instance called!' );
}
if ( !$this->enable ) {
throw new \BadMethodCallException( 'Attempt to use PHP session management' );
}
$session = $this->manager->getSessionById( $id, false );
if ( $session ) {
$session->clear();
}
return true;
}
/**
* Execute garbage collection.
* @internal For internal use only
* @param int $maxlifetime Maximum session life time (ignored)
* @return true
* @codeCoverageIgnore See T135576
*/
#[\ReturnTypeWillChange]
public function gc( $maxlifetime ) {
if ( self::$instance !== $this ) {
throw new \UnexpectedValueException( __METHOD__ . ': Wrong instance called!' );
}
$this->store->deleteObjectsExpiringBefore( wfTimestampNow() );
return true;
}
}