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<?php
/**
* MediaWiki cookie-based session provider interface
*
* 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 InvalidArgumentException;
use MediaWiki\MainConfigNames;
use MediaWiki\Request\WebRequest;
use MediaWiki\User\User;
use MediaWiki\User\UserRigorOptions;
/**
* A CookieSessionProvider persists sessions using cookies
*
* @ingroup Session
* @since 1.27
*/
class CookieSessionProvider extends SessionProvider {
/** @var mixed[] */
protected $params = [];
/** @var mixed[] */
protected $cookieOptions = [];
/**
* @param array $params Keys include:
* - priority: (required) Priority of the returned sessions
* - sessionName: Session cookie name. Doesn't honor 'prefix'. Defaults to
* $wgSessionName, or $wgCookiePrefix . '_session' if that is unset.
* - cookieOptions: Options to pass to WebRequest::setCookie():
* - prefix: Cookie prefix, defaults to $wgCookiePrefix
* - path: Cookie path, defaults to $wgCookiePath
* - domain: Cookie domain, defaults to $wgCookieDomain
* - secure: Cookie secure flag, defaults to $wgCookieSecure
* - httpOnly: Cookie httpOnly flag, defaults to $wgCookieHttpOnly
* - sameSite: Cookie SameSite attribute, defaults to $wgCookieSameSite
*/
public function __construct( $params = [] ) {
parent::__construct();
$params += [
'cookieOptions' => [],
// @codeCoverageIgnoreStart
];
// @codeCoverageIgnoreEnd
if ( !isset( $params['priority'] ) ) {
throw new InvalidArgumentException( __METHOD__ . ': priority must be specified' );
}
if ( $params['priority'] < SessionInfo::MIN_PRIORITY ||
$params['priority'] > SessionInfo::MAX_PRIORITY
) {
throw new InvalidArgumentException( __METHOD__ . ': Invalid priority' );
}
if ( !is_array( $params['cookieOptions'] ) ) {
throw new InvalidArgumentException( __METHOD__ . ': cookieOptions must be an array' );
}
$this->priority = $params['priority'];
$this->cookieOptions = $params['cookieOptions'];
$this->params = $params;
unset( $this->params['priority'] );
unset( $this->params['cookieOptions'] );
}
protected function postInitSetup() {
$this->params += [
'sessionName' =>
$this->getConfig()->get( MainConfigNames::SessionName )
?: $this->getConfig()->get( MainConfigNames::CookiePrefix ) . '_session',
];
$sameSite = $this->getConfig()->get( MainConfigNames::CookieSameSite );
// @codeCoverageIgnoreStart
$this->cookieOptions += [
// @codeCoverageIgnoreEnd
'prefix' => $this->getConfig()->get( MainConfigNames::CookiePrefix ),
'path' => $this->getConfig()->get( MainConfigNames::CookiePath ),
'domain' => $this->getConfig()->get( MainConfigNames::CookieDomain ),
'secure' => $this->getConfig()->get( MainConfigNames::CookieSecure )
|| $this->getConfig()->get( MainConfigNames::ForceHTTPS ),
'httpOnly' => $this->getConfig()->get( MainConfigNames::CookieHttpOnly ),
'sameSite' => $sameSite,
];
}
public function provideSessionInfo( WebRequest $request ) {
$sessionId = $this->getCookie( $request, $this->params['sessionName'], '' );
$info = [
'provider' => $this,
'forceHTTPS' => $this->getCookie( $request, 'forceHTTPS', '', false )
];
if ( SessionManager::validateSessionId( $sessionId ) ) {
$info['id'] = $sessionId;
$info['persisted'] = true;
}
[ $userId, $userName, $token ] = $this->getUserInfoFromCookies( $request );
if ( $userId !== null ) {
try {
$userInfo = UserInfo::newFromId( $userId );
} catch ( InvalidArgumentException $ex ) {
return null;
}
if ( $userName !== null && $userInfo->getName() !== $userName ) {
$this->logger->warning(
'Session "{session}" requested with mismatched UserID and UserName cookies.',
[
'session' => $sessionId,
'mismatch' => [
'userid' => $userId,
'cookie_username' => $userName,
'username' => $userInfo->getName(),
],
] );
return null;
}
if ( $token !== null ) {
if ( !hash_equals( $userInfo->getToken(), $token ) ) {
$this->logger->warning(
'Session "{session}" requested with invalid Token cookie.',
[
'session' => $sessionId,
'userid' => $userId,
'username' => $userInfo->getName(),
] );
return null;
}
$info['userInfo'] = $userInfo->verified();
$info['persisted'] = true; // If we have user+token, it should be
} elseif ( isset( $info['id'] ) ) {
$info['userInfo'] = $userInfo;
} else {
// No point in returning, loadSessionInfoFromStore() will
// reject it anyway.
return null;
}
} elseif ( isset( $info['id'] ) ) {
// No UserID cookie, so insist that the session is anonymous.
// Note: this event occurs for several normal activities:
// * anon visits Special:UserLogin
// * anon browsing after seeing Special:UserLogin
// * anon browsing after edit or preview
$this->logger->debug(
'Session "{session}" requested without UserID cookie',
[
'session' => $info['id'],
] );
$info['userInfo'] = UserInfo::newAnonymous();
} else {
// No session ID and no user is the same as an empty session, so
// there's no point.
return null;
}
return new SessionInfo( $this->priority, $info );
}
public function persistsSessionId() {
return true;
}
public function canChangeUser() {
return true;
}
public function persistSession( SessionBackend $session, WebRequest $request ) {
$response = $request->response();
if ( $response->headersSent() ) {
// Can't do anything now
$this->logger->debug( __METHOD__ . ': Headers already sent' );
return;
}
$user = $session->getUser();
$cookies = $this->cookieDataToExport( $user, $session->shouldRememberUser() );
$sessionData = $this->sessionDataToExport( $user );
$options = $this->cookieOptions;
$forceHTTPS = $session->shouldForceHTTPS() || $user->requiresHTTPS();
if ( $forceHTTPS ) {
$options['secure'] = $this->getConfig()->get( MainConfigNames::CookieSecure )
|| $this->getConfig()->get( MainConfigNames::ForceHTTPS );
}
$response->setCookie( $this->params['sessionName'], $session->getId(), null,
[ 'prefix' => '' ] + $options
);
foreach ( $cookies as $key => $value ) {
if ( $value === false ) {
$response->clearCookie( $key, $options );
} else {
$expirationDuration = $this->getLoginCookieExpiration( $key, $session->shouldRememberUser() );
$expiration = $expirationDuration ? $expirationDuration + time() : null;
$response->setCookie( $key, (string)$value, $expiration, $options );
}
}
$this->setForceHTTPSCookie( $forceHTTPS, $session, $request );
$this->setLoggedOutCookie( $session->getLoggedOutTimestamp(), $request );
if ( $sessionData ) {
$session->addData( $sessionData );
}
}
public function unpersistSession( WebRequest $request ) {
$response = $request->response();
if ( $response->headersSent() ) {
// Can't do anything now
$this->logger->debug( __METHOD__ . ': Headers already sent' );
return;
}
$cookies = [
'UserID' => false,
'Token' => false,
];
$response->clearCookie(
$this->params['sessionName'], [ 'prefix' => '' ] + $this->cookieOptions
);
foreach ( $cookies as $key => $value ) {
$response->clearCookie( $key, $this->cookieOptions );
}
$this->setForceHTTPSCookie( false, null, $request );
}
/**
* Set the "forceHTTPS" cookie, unless $wgForceHTTPS prevents it.
*
* @param bool $set Whether the cookie should be set or not
* @param SessionBackend|null $backend
* @param WebRequest $request
*/
protected function setForceHTTPSCookie( $set, ?SessionBackend $backend, WebRequest $request ) {
if ( $this->getConfig()->get( MainConfigNames::ForceHTTPS ) ) {
// No need to send a cookie if the wiki is always HTTPS (T256095)
return;
}
$response = $request->response();
if ( $set ) {
if ( $backend->shouldRememberUser() ) {
$expirationDuration = $this->getLoginCookieExpiration(
'forceHTTPS',
true
);
$expiration = $expirationDuration ? $expirationDuration + time() : null;
} else {
$expiration = null;
}
$response->setCookie( 'forceHTTPS', 'true', $expiration,
[ 'prefix' => '', 'secure' => false ] + $this->cookieOptions );
} else {
$response->clearCookie( 'forceHTTPS',
[ 'prefix' => '', 'secure' => false ] + $this->cookieOptions );
}
}
/**
* @param int $loggedOut timestamp
* @param WebRequest $request
*/
protected function setLoggedOutCookie( $loggedOut, WebRequest $request ) {
if ( $loggedOut + 86400 > time() &&
$loggedOut !== (int)$this->getCookie( $request, 'LoggedOut', $this->cookieOptions['prefix'] )
) {
$request->response()->setCookie( 'LoggedOut', (string)$loggedOut, $loggedOut + 86400,
$this->cookieOptions );
}
}
public function getVaryCookies() {
return [
// Vary on token and session because those are the real authn
// determiners. UserID and UserName don't matter without those.
$this->cookieOptions['prefix'] . 'Token',
$this->cookieOptions['prefix'] . 'LoggedOut',
$this->params['sessionName'],
'forceHTTPS',
];
}
public function suggestLoginUsername( WebRequest $request ) {
$name = $this->getCookie( $request, 'UserName', $this->cookieOptions['prefix'] );
if ( $name !== null ) {
if ( $this->userNameUtils->isTemp( $name ) ) {
$name = false;
} else {
$name = $this->userNameUtils->getCanonical( $name, UserRigorOptions::RIGOR_USABLE );
}
}
return $name === false ? null : $name;
}
/**
* Fetch the user identity from cookies
* @param WebRequest $request
* @return array (string|null $id, string|null $username, string|null $token)
*/
protected function getUserInfoFromCookies( $request ) {
$prefix = $this->cookieOptions['prefix'];
return [
$this->getCookie( $request, 'UserID', $prefix ),
$this->getCookie( $request, 'UserName', $prefix ),
$this->getCookie( $request, 'Token', $prefix ),
];
}
/**
* Get a cookie. Contains an auth-specific hack.
* @param WebRequest $request
* @param string $key
* @param string $prefix
* @param mixed|null $default
* @return mixed
*/
protected function getCookie( $request, $key, $prefix, $default = null ) {
$value = $request->getCookie( $key, $prefix, $default );
if ( $value === 'deleted' ) {
// PHP uses this value when deleting cookies. A legitimate cookie will never have
// this value (usernames start with uppercase, token is longer, other auth cookies
// are booleans or integers). Seeing this means that in a previous request we told the
// client to delete the cookie, but it has poor cookie handling. Pretend the cookie is
// not there to avoid invalidating the session.
return null;
}
return $value;
}
/**
* Return the data to store in cookies
* @param User $user
* @param bool $remember
* @return array $cookies Set value false to unset the cookie
*/
protected function cookieDataToExport( $user, $remember ) {
if ( $user->isAnon() ) {
return [
'UserID' => false,
'Token' => false,
];
} else {
return [
'UserID' => $user->getId(),
'UserName' => $user->getName(),
'Token' => $remember ? (string)$user->getToken() : false,
];
}
}
/**
* Return extra data to store in the session
* @param User $user
* @return array
*/
protected function sessionDataToExport( $user ) {
return [];
}
public function whyNoSession() {
return wfMessage( 'sessionprovider-nocookies' );
}
public function getRememberUserDuration() {
return min( $this->getLoginCookieExpiration( 'UserID', true ),
$this->getLoginCookieExpiration( 'Token', true ) ) ?: null;
}
/**
* Gets the list of cookies that must be set to the 'remember me' duration,
* if $wgExtendedLoginCookieExpiration is in use.
*
* @return string[] Array of unprefixed cookie keys
*/
protected function getExtendedLoginCookies() {
return [ 'UserID', 'UserName', 'Token' ];
}
/**
* Returns the lifespan of the login cookies, in seconds. 0 means until the end of the session.
*
* Cookies that are session-length do not call this function.
*
* @param string $cookieName
* @param bool $shouldRememberUser Whether the user should be remembered
* long-term
* @return int Cookie expiration time in seconds; 0 for session cookies
*/
protected function getLoginCookieExpiration( $cookieName, $shouldRememberUser ) {
$extendedCookies = $this->getExtendedLoginCookies();
$normalExpiration = $this->getConfig()->get( MainConfigNames::CookieExpiration );
if ( $shouldRememberUser && in_array( $cookieName, $extendedCookies, true ) ) {
$extendedExpiration = $this->getConfig()->get( MainConfigNames::ExtendedLoginCookieExpiration );
return ( $extendedExpiration !== null ) ? (int)$extendedExpiration : (int)$normalExpiration;
} else {
return (int)$normalExpiration;
}
}
}