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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\CentralAuth\Hooks\Handlers; |
| 4 | |
| 5 | use MediaWiki\Auth\AuthManager; |
| 6 | use MediaWiki\Config\Config; |
| 7 | use MediaWiki\Extension\CentralAuth\CentralAuthHooks; |
| 8 | use MediaWiki\Extension\CentralAuth\CentralAuthSessionManager; |
| 9 | use MediaWiki\Extension\CentralAuth\CentralAuthUtilityService; |
| 10 | use MediaWiki\Logger\LoggerFactory; |
| 11 | use MediaWiki\SpecialPage\Hook\SpecialPageBeforeExecuteHook; |
| 12 | use MediaWiki\SpecialPage\SpecialPage; |
| 13 | use MediaWiki\Title\Title; |
| 14 | use MediaWiki\WikiMap\WikiMap; |
| 15 | use MobileContext; |
| 16 | use Wikimedia\LightweightObjectStore\ExpirationAwareness; |
| 17 | |
| 18 | /** |
| 19 | * Triggers a server-side (top-level) central autologin attempt on Special:Userlogin. |
| 20 | */ |
| 21 | class SpecialPageBeforeExecuteHookHandler implements SpecialPageBeforeExecuteHook { |
| 22 | |
| 23 | /** |
| 24 | * Name of the cookie that represents that top-level auto-login has been attempted. |
| 25 | * It is set before the initiation of autologin, cleared on success (or via expiry), |
| 26 | * and prevents further (or concurrent) attempts. |
| 27 | * See also ext.centralauth.centralautologin.clearcookie.js. |
| 28 | */ |
| 29 | public const AUTOLOGIN_TRIED_COOKIE = 'CentralAuthAnonTopLevel'; |
| 30 | |
| 31 | /** |
| 32 | * Query parameter that marks that we have just returned from a top-level autologin attempt. |
| 33 | * Used to prevent redirect loops. Normally the cookie would do that, but the client might |
| 34 | * not record the cookie for some reason. |
| 35 | */ |
| 36 | private const AUTOLOGIN_TRIED_QUERY_PARAM = 'centralAuthAutologinTried'; |
| 37 | |
| 38 | /** Query parameter used to return error messages from SpecialCentralAutoLogin. */ |
| 39 | public const AUTOLOGIN_ERROR_QUERY_PARAM = 'centralAuthError'; |
| 40 | |
| 41 | /** @var AuthManager */ |
| 42 | private AuthManager $authManager; |
| 43 | |
| 44 | /** @var Config */ |
| 45 | private Config $config; |
| 46 | |
| 47 | /** @var CentralAuthSessionManager */ |
| 48 | private CentralAuthSessionManager $sessionManager; |
| 49 | |
| 50 | /** @var CentralAuthUtilityService */ |
| 51 | private CentralAuthUtilityService $centralAuthUtilityService; |
| 52 | |
| 53 | /** |
| 54 | * @param AuthManager $authManager |
| 55 | * @param Config $config |
| 56 | * @param CentralAuthSessionManager $sessionManager |
| 57 | * @param CentralAuthUtilityService $centralAuthUtilityService |
| 58 | */ |
| 59 | public function __construct( |
| 60 | AuthManager $authManager, |
| 61 | Config $config, |
| 62 | CentralAuthSessionManager $sessionManager, |
| 63 | CentralAuthUtilityService $centralAuthUtilityService |
| 64 | ) { |
| 65 | $this->authManager = $authManager; |
| 66 | $this->config = $config; |
| 67 | $this->sessionManager = $sessionManager; |
| 68 | $this->centralAuthUtilityService = $centralAuthUtilityService; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Triggers top-level central autologin attempt on Special:Userlogin, and handles the |
| 73 | * outcome of such an attempt at the end of the redirect chain. |
| 74 | * |
| 75 | * @param SpecialPage $special |
| 76 | * @param string|null $subPage |
| 77 | * @return bool |
| 78 | * |
| 79 | * @see SpecialCentralAutoLogin |
| 80 | */ |
| 81 | public function onSpecialPageBeforeExecute( $special, $subPage ) { |
| 82 | $request = $special->getRequest(); |
| 83 | $amKey = 'AuthManagerSpecialPage:return:' . $special->getName(); |
| 84 | |
| 85 | // Only attempt top-level autologin if the user is about to log in, the login isn't |
| 86 | // already in progress, it is a normal login, and there is a central login wiki to use. |
| 87 | // This check will also pass if the user just finished (successfully or not) the autologin. |
| 88 | if ( $special->getName() !== 'Userlogin' |
| 89 | || $request->wasPosted() |
| 90 | || $subPage |
| 91 | // Deal with the edge case where AuthManagerSpecialPage::handleReturnBeforeExecute() |
| 92 | // redirects from Special:Userlogin/return, and the login session is the only thing |
| 93 | // that gives away that we are in the middle of a remote login flow. |
| 94 | || $this->authManager->getAuthenticationSessionData( $amKey ) |
| 95 | // elevated-security reauthentication of already logged-in user |
| 96 | || $request->getBool( 'force' ) |
| 97 | || !$this->config->get( 'CentralAuthLoginWiki' ) |
| 98 | || $this->config->get( 'CentralAuthLoginWiki' ) === WikiMap::getCurrentWikiId() |
| 99 | ) { |
| 100 | return true; |
| 101 | } |
| 102 | |
| 103 | $isMobile = CentralAuthHooks::isMobileDomain(); |
| 104 | |
| 105 | // Do a top-level autologin if the user needs to log in. Use a cookie to prevent |
| 106 | // unnecessary autologin attempts if we already know they will fail, and a query parameter |
| 107 | // (to be set by SpecialCentralAutoLogin) to avoid an infinite loop even if we cannot set |
| 108 | // cookies for some reason. |
| 109 | if ( $special->getUser()->isAnon() |
| 110 | && !$request->getCookie( self::AUTOLOGIN_TRIED_COOKIE, '' ) |
| 111 | && !$request->getCheck( self::AUTOLOGIN_TRIED_QUERY_PARAM ) |
| 112 | ) { |
| 113 | $url = WikiMap::getForeignURL( |
| 114 | $this->config->get( 'CentralAuthLoginWiki' ), |
| 115 | 'Special:CentralAutoLogin/checkLoggedIn' |
| 116 | ); |
| 117 | if ( $url === false ) { |
| 118 | // WikiMap misconfigured? |
| 119 | return true; |
| 120 | } |
| 121 | |
| 122 | $this->log( 'Top-level autologin started', $special, $isMobile ); |
| 123 | |
| 124 | $request->response()->setCookie( |
| 125 | self::AUTOLOGIN_TRIED_COOKIE, |
| 126 | '1', |
| 127 | // use 1 day like anon-set.js |
| 128 | time() + ExpirationAwareness::TTL_DAY, |
| 129 | // match the behavior of the CentralAuthAnon cookie |
| 130 | [ 'prefix' => '', 'httpOnly' => false ] |
| 131 | ); |
| 132 | |
| 133 | $returnUrl = wfAppendQuery( $request->getFullRequestURL(), [ |
| 134 | self::AUTOLOGIN_TRIED_QUERY_PARAM => 1, |
| 135 | ] ); |
| 136 | if ( CentralAuthHooks::isMobileDomain() ) { |
| 137 | // WebRequest::getFullRequestURL() uses $wgServer, not the actual request |
| 138 | // domain, but we do want to preserve that |
| 139 | $returnUrl = MobileContext::singleton()->getMobileUrl( $returnUrl ); |
| 140 | } |
| 141 | $returnUrlToken = $this->centralAuthUtilityService->tokenize( $returnUrl, |
| 142 | 'centralautologin-returnurl', $this->sessionManager ); |
| 143 | $url = wfAppendQuery( $url, [ |
| 144 | 'type' => 'redirect', |
| 145 | 'returnUrlToken' => $returnUrlToken, |
| 146 | 'wikiid' => WikiMap::getCurrentWikiId(), |
| 147 | 'mobile' => $isMobile ? 1 : null, |
| 148 | ] ); |
| 149 | $special->getOutput()->redirect( $url ); |
| 150 | |
| 151 | return false; |
| 152 | } |
| 153 | |
| 154 | // Clean up after successful autologin. |
| 155 | if ( $special->getUser()->isRegistered() |
| 156 | && $request->getCheck( self::AUTOLOGIN_TRIED_QUERY_PARAM ) |
| 157 | ) { |
| 158 | $this->log( 'Top-level autologin succeeded', $special, $isMobile ); |
| 159 | |
| 160 | $request->response()->clearCookie( self::AUTOLOGIN_TRIED_COOKIE, [ 'prefix' => '' ] ); |
| 161 | // If returnto is set, let SpecialUserlogin redirect the user. If it is not set, |
| 162 | // we would just show the login page, which would be confusing, so send the user away. |
| 163 | if ( $request->getCheck( 'returnto' ) ) { |
| 164 | return true; |
| 165 | } else { |
| 166 | $special->getOutput()->redirect( Title::newMainPage( $special->getContext() )->getLocalURL() ); |
| 167 | return false; |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | // Log failed / prevented autologin. |
| 172 | if ( $special->getUser()->isAnon() |
| 173 | && $request->getCheck( self::AUTOLOGIN_TRIED_QUERY_PARAM ) |
| 174 | ) { |
| 175 | $error = $request->getRawVal( self::AUTOLOGIN_ERROR_QUERY_PARAM, 'unknown error' ); |
| 176 | $this->log( "Top-level autologin failed: $error", $special, $isMobile ); |
| 177 | } elseif ( $special->getUser()->isAnon() |
| 178 | && $request->getCookie( self::AUTOLOGIN_TRIED_COOKIE, '' ) |
| 179 | ) { |
| 180 | $this->log( 'Top-level autologin prevented by cookie', $special, $isMobile ); |
| 181 | } |
| 182 | // Else: the user is already logged in and manually visiting the login page, e.g. |
| 183 | // to log in as another user. Nothing to do. |
| 184 | |
| 185 | return true; |
| 186 | } |
| 187 | |
| 188 | private function log( string $message, SpecialPage $special, bool $isMobile ): void { |
| 189 | $request = $special->getRequest(); |
| 190 | LoggerFactory::getInstance( 'CentralAuth' )->debug( $message, [ |
| 191 | 'userAgent' => $request->getHeader( 'User-Agent' ), |
| 192 | 'isMobile' => $isMobile, |
| 193 | 'username' => $special->getUser()->isRegistered() ? $special->getUser()->getName() : '', |
| 194 | 'suggestedLoginUsername' => $request->getSession()->suggestLoginUsername(), |
| 195 | ] ); |
| 196 | } |
| 197 | |
| 198 | } |