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| 1 | <?php |
| 2 | /** |
| 3 | * MediaWiki cookie-based session provider interface |
| 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\MainConfigNames; |
| 27 | use MediaWiki\Request\WebRequest; |
| 28 | use MediaWiki\User\User; |
| 29 | use MediaWiki\User\UserRigorOptions; |
| 30 | |
| 31 | /** |
| 32 | * A CookieSessionProvider persists sessions using cookies |
| 33 | * |
| 34 | * @ingroup Session |
| 35 | * @since 1.27 |
| 36 | */ |
| 37 | class CookieSessionProvider extends SessionProvider { |
| 38 | |
| 39 | /** @var mixed[] */ |
| 40 | protected $params = []; |
| 41 | |
| 42 | /** @var mixed[] */ |
| 43 | protected $cookieOptions = []; |
| 44 | |
| 45 | /** |
| 46 | * @param array $params Keys include: |
| 47 | * - priority: (required) Priority of the returned sessions |
| 48 | * - sessionName: Session cookie name. Doesn't honor 'prefix'. Defaults to |
| 49 | * $wgSessionName, or $wgCookiePrefix . '_session' if that is unset. |
| 50 | * - cookieOptions: Options to pass to WebRequest::setCookie(): |
| 51 | * - prefix: Cookie prefix, defaults to $wgCookiePrefix |
| 52 | * - path: Cookie path, defaults to $wgCookiePath |
| 53 | * - domain: Cookie domain, defaults to $wgCookieDomain |
| 54 | * - secure: Cookie secure flag, defaults to $wgCookieSecure |
| 55 | * - httpOnly: Cookie httpOnly flag, defaults to $wgCookieHttpOnly |
| 56 | * - sameSite: Cookie SameSite attribute, defaults to $wgCookieSameSite |
| 57 | */ |
| 58 | public function __construct( $params = [] ) { |
| 59 | parent::__construct(); |
| 60 | |
| 61 | $params += [ |
| 62 | 'cookieOptions' => [], |
| 63 | // @codeCoverageIgnoreStart |
| 64 | ]; |
| 65 | // @codeCoverageIgnoreEnd |
| 66 | |
| 67 | if ( !isset( $params['priority'] ) ) { |
| 68 | throw new \InvalidArgumentException( __METHOD__ . ': priority must be specified' ); |
| 69 | } |
| 70 | if ( $params['priority'] < SessionInfo::MIN_PRIORITY || |
| 71 | $params['priority'] > SessionInfo::MAX_PRIORITY |
| 72 | ) { |
| 73 | throw new \InvalidArgumentException( __METHOD__ . ': Invalid priority' ); |
| 74 | } |
| 75 | |
| 76 | if ( !is_array( $params['cookieOptions'] ) ) { |
| 77 | throw new \InvalidArgumentException( __METHOD__ . ': cookieOptions must be an array' ); |
| 78 | } |
| 79 | |
| 80 | $this->priority = $params['priority']; |
| 81 | $this->cookieOptions = $params['cookieOptions']; |
| 82 | $this->params = $params; |
| 83 | unset( $this->params['priority'] ); |
| 84 | unset( $this->params['cookieOptions'] ); |
| 85 | } |
| 86 | |
| 87 | protected function postInitSetup() { |
| 88 | $this->params += [ |
| 89 | 'sessionName' => |
| 90 | $this->getConfig()->get( MainConfigNames::SessionName ) |
| 91 | ?: $this->getConfig()->get( MainConfigNames::CookiePrefix ) . '_session', |
| 92 | ]; |
| 93 | |
| 94 | $sameSite = $this->getConfig()->get( MainConfigNames::CookieSameSite ); |
| 95 | |
| 96 | // @codeCoverageIgnoreStart |
| 97 | $this->cookieOptions += [ |
| 98 | // @codeCoverageIgnoreEnd |
| 99 | 'prefix' => $this->getConfig()->get( MainConfigNames::CookiePrefix ), |
| 100 | 'path' => $this->getConfig()->get( MainConfigNames::CookiePath ), |
| 101 | 'domain' => $this->getConfig()->get( MainConfigNames::CookieDomain ), |
| 102 | 'secure' => $this->getConfig()->get( MainConfigNames::CookieSecure ) |
| 103 | || $this->getConfig()->get( MainConfigNames::ForceHTTPS ), |
| 104 | 'httpOnly' => $this->getConfig()->get( MainConfigNames::CookieHttpOnly ), |
| 105 | 'sameSite' => $sameSite, |
| 106 | ]; |
| 107 | } |
| 108 | |
| 109 | public function provideSessionInfo( WebRequest $request ) { |
| 110 | $sessionId = $this->getCookie( $request, $this->params['sessionName'], '' ); |
| 111 | $info = [ |
| 112 | 'provider' => $this, |
| 113 | 'forceHTTPS' => $this->getCookie( $request, 'forceHTTPS', '', false ) |
| 114 | ]; |
| 115 | if ( SessionManager::validateSessionId( $sessionId ) ) { |
| 116 | $info['id'] = $sessionId; |
| 117 | $info['persisted'] = true; |
| 118 | } |
| 119 | |
| 120 | [ $userId, $userName, $token ] = $this->getUserInfoFromCookies( $request ); |
| 121 | if ( $userId !== null ) { |
| 122 | try { |
| 123 | $userInfo = UserInfo::newFromId( $userId ); |
| 124 | } catch ( \InvalidArgumentException $ex ) { |
| 125 | return null; |
| 126 | } |
| 127 | |
| 128 | if ( $userName !== null && $userInfo->getName() !== $userName ) { |
| 129 | $this->logger->warning( |
| 130 | 'Session "{session}" requested with mismatched UserID and UserName cookies.', |
| 131 | [ |
| 132 | 'session' => $sessionId, |
| 133 | 'mismatch' => [ |
| 134 | 'userid' => $userId, |
| 135 | 'cookie_username' => $userName, |
| 136 | 'username' => $userInfo->getName(), |
| 137 | ], |
| 138 | ] ); |
| 139 | return null; |
| 140 | } |
| 141 | |
| 142 | if ( $token !== null ) { |
| 143 | if ( !hash_equals( $userInfo->getToken(), $token ) ) { |
| 144 | $this->logger->warning( |
| 145 | 'Session "{session}" requested with invalid Token cookie.', |
| 146 | [ |
| 147 | 'session' => $sessionId, |
| 148 | 'userid' => $userId, |
| 149 | 'username' => $userInfo->getName(), |
| 150 | ] ); |
| 151 | return null; |
| 152 | } |
| 153 | $info['userInfo'] = $userInfo->verified(); |
| 154 | $info['persisted'] = true; // If we have user+token, it should be |
| 155 | } elseif ( isset( $info['id'] ) ) { |
| 156 | $info['userInfo'] = $userInfo; |
| 157 | } else { |
| 158 | // No point in returning, loadSessionInfoFromStore() will |
| 159 | // reject it anyway. |
| 160 | return null; |
| 161 | } |
| 162 | } elseif ( isset( $info['id'] ) ) { |
| 163 | // No UserID cookie, so insist that the session is anonymous. |
| 164 | // Note: this event occurs for several normal activities: |
| 165 | // * anon visits Special:UserLogin |
| 166 | // * anon browsing after seeing Special:UserLogin |
| 167 | // * anon browsing after edit or preview |
| 168 | $this->logger->debug( |
| 169 | 'Session "{session}" requested without UserID cookie', |
| 170 | [ |
| 171 | 'session' => $info['id'], |
| 172 | ] ); |
| 173 | $info['userInfo'] = UserInfo::newAnonymous(); |
| 174 | } else { |
| 175 | // No session ID and no user is the same as an empty session, so |
| 176 | // there's no point. |
| 177 | return null; |
| 178 | } |
| 179 | |
| 180 | return new SessionInfo( $this->priority, $info ); |
| 181 | } |
| 182 | |
| 183 | public function persistsSessionId() { |
| 184 | return true; |
| 185 | } |
| 186 | |
| 187 | public function canChangeUser() { |
| 188 | return true; |
| 189 | } |
| 190 | |
| 191 | public function persistSession( SessionBackend $session, WebRequest $request ) { |
| 192 | $response = $request->response(); |
| 193 | if ( $response->headersSent() ) { |
| 194 | // Can't do anything now |
| 195 | $this->logger->debug( __METHOD__ . ': Headers already sent' ); |
| 196 | return; |
| 197 | } |
| 198 | |
| 199 | $user = $session->getUser(); |
| 200 | |
| 201 | $cookies = $this->cookieDataToExport( $user, $session->shouldRememberUser() ); |
| 202 | $sessionData = $this->sessionDataToExport( $user ); |
| 203 | |
| 204 | $options = $this->cookieOptions; |
| 205 | |
| 206 | $forceHTTPS = $session->shouldForceHTTPS() || $user->requiresHTTPS(); |
| 207 | if ( $forceHTTPS ) { |
| 208 | $options['secure'] = $this->getConfig()->get( MainConfigNames::CookieSecure ) |
| 209 | || $this->getConfig()->get( MainConfigNames::ForceHTTPS ); |
| 210 | } |
| 211 | |
| 212 | $response->setCookie( $this->params['sessionName'], $session->getId(), null, |
| 213 | [ 'prefix' => '' ] + $options |
| 214 | ); |
| 215 | |
| 216 | foreach ( $cookies as $key => $value ) { |
| 217 | if ( $value === false ) { |
| 218 | $response->clearCookie( $key, $options ); |
| 219 | } else { |
| 220 | $expirationDuration = $this->getLoginCookieExpiration( $key, $session->shouldRememberUser() ); |
| 221 | $expiration = $expirationDuration ? $expirationDuration + time() : null; |
| 222 | $response->setCookie( $key, (string)$value, $expiration, $options ); |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | $this->setForceHTTPSCookie( $forceHTTPS, $session, $request ); |
| 227 | $this->setLoggedOutCookie( $session->getLoggedOutTimestamp(), $request ); |
| 228 | |
| 229 | if ( $sessionData ) { |
| 230 | $session->addData( $sessionData ); |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | public function unpersistSession( WebRequest $request ) { |
| 235 | $response = $request->response(); |
| 236 | if ( $response->headersSent() ) { |
| 237 | // Can't do anything now |
| 238 | $this->logger->debug( __METHOD__ . ': Headers already sent' ); |
| 239 | return; |
| 240 | } |
| 241 | |
| 242 | $cookies = [ |
| 243 | 'UserID' => false, |
| 244 | 'Token' => false, |
| 245 | ]; |
| 246 | |
| 247 | $response->clearCookie( |
| 248 | $this->params['sessionName'], [ 'prefix' => '' ] + $this->cookieOptions |
| 249 | ); |
| 250 | |
| 251 | foreach ( $cookies as $key => $value ) { |
| 252 | $response->clearCookie( $key, $this->cookieOptions ); |
| 253 | } |
| 254 | |
| 255 | $this->setForceHTTPSCookie( false, null, $request ); |
| 256 | } |
| 257 | |
| 258 | /** |
| 259 | * Set the "forceHTTPS" cookie, unless $wgForceHTTPS prevents it. |
| 260 | * |
| 261 | * @param bool $set Whether the cookie should be set or not |
| 262 | * @param SessionBackend|null $backend |
| 263 | * @param WebRequest $request |
| 264 | */ |
| 265 | protected function setForceHTTPSCookie( $set, ?SessionBackend $backend, WebRequest $request ) { |
| 266 | if ( $this->getConfig()->get( MainConfigNames::ForceHTTPS ) ) { |
| 267 | // No need to send a cookie if the wiki is always HTTPS (T256095) |
| 268 | return; |
| 269 | } |
| 270 | $response = $request->response(); |
| 271 | if ( $set ) { |
| 272 | if ( $backend->shouldRememberUser() ) { |
| 273 | $expirationDuration = $this->getLoginCookieExpiration( |
| 274 | 'forceHTTPS', |
| 275 | true |
| 276 | ); |
| 277 | $expiration = $expirationDuration ? $expirationDuration + time() : null; |
| 278 | } else { |
| 279 | $expiration = null; |
| 280 | } |
| 281 | $response->setCookie( 'forceHTTPS', 'true', $expiration, |
| 282 | [ 'prefix' => '', 'secure' => false ] + $this->cookieOptions ); |
| 283 | } else { |
| 284 | $response->clearCookie( 'forceHTTPS', |
| 285 | [ 'prefix' => '', 'secure' => false ] + $this->cookieOptions ); |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * @param int $loggedOut timestamp |
| 291 | * @param WebRequest $request |
| 292 | */ |
| 293 | protected function setLoggedOutCookie( $loggedOut, WebRequest $request ) { |
| 294 | if ( $loggedOut + 86400 > time() && |
| 295 | $loggedOut !== (int)$this->getCookie( $request, 'LoggedOut', $this->cookieOptions['prefix'] ) |
| 296 | ) { |
| 297 | $request->response()->setCookie( 'LoggedOut', (string)$loggedOut, $loggedOut + 86400, |
| 298 | $this->cookieOptions ); |
| 299 | } |
| 300 | } |
| 301 | |
| 302 | public function getVaryCookies() { |
| 303 | return [ |
| 304 | // Vary on token and session because those are the real authn |
| 305 | // determiners. UserID and UserName don't matter without those. |
| 306 | $this->cookieOptions['prefix'] . 'Token', |
| 307 | $this->cookieOptions['prefix'] . 'LoggedOut', |
| 308 | $this->params['sessionName'], |
| 309 | 'forceHTTPS', |
| 310 | ]; |
| 311 | } |
| 312 | |
| 313 | public function suggestLoginUsername( WebRequest $request ) { |
| 314 | $name = $this->getCookie( $request, 'UserName', $this->cookieOptions['prefix'] ); |
| 315 | if ( $name !== null ) { |
| 316 | if ( $this->userNameUtils->isTemp( $name ) ) { |
| 317 | $name = false; |
| 318 | } else { |
| 319 | $name = $this->userNameUtils->getCanonical( $name, UserRigorOptions::RIGOR_USABLE ); |
| 320 | } |
| 321 | } |
| 322 | return $name === false ? null : $name; |
| 323 | } |
| 324 | |
| 325 | /** |
| 326 | * Fetch the user identity from cookies |
| 327 | * @param WebRequest $request |
| 328 | * @return array (string|null $id, string|null $username, string|null $token) |
| 329 | */ |
| 330 | protected function getUserInfoFromCookies( $request ) { |
| 331 | $prefix = $this->cookieOptions['prefix']; |
| 332 | return [ |
| 333 | $this->getCookie( $request, 'UserID', $prefix ), |
| 334 | $this->getCookie( $request, 'UserName', $prefix ), |
| 335 | $this->getCookie( $request, 'Token', $prefix ), |
| 336 | ]; |
| 337 | } |
| 338 | |
| 339 | /** |
| 340 | * Get a cookie. Contains an auth-specific hack. |
| 341 | * @param WebRequest $request |
| 342 | * @param string $key |
| 343 | * @param string $prefix |
| 344 | * @param mixed|null $default |
| 345 | * @return mixed |
| 346 | */ |
| 347 | protected function getCookie( $request, $key, $prefix, $default = null ) { |
| 348 | $value = $request->getCookie( $key, $prefix, $default ); |
| 349 | if ( $value === 'deleted' ) { |
| 350 | // PHP uses this value when deleting cookies. A legitimate cookie will never have |
| 351 | // this value (usernames start with uppercase, token is longer, other auth cookies |
| 352 | // are booleans or integers). Seeing this means that in a previous request we told the |
| 353 | // client to delete the cookie, but it has poor cookie handling. Pretend the cookie is |
| 354 | // not there to avoid invalidating the session. |
| 355 | return null; |
| 356 | } |
| 357 | return $value; |
| 358 | } |
| 359 | |
| 360 | /** |
| 361 | * Return the data to store in cookies |
| 362 | * @param User $user |
| 363 | * @param bool $remember |
| 364 | * @return array $cookies Set value false to unset the cookie |
| 365 | */ |
| 366 | protected function cookieDataToExport( $user, $remember ) { |
| 367 | if ( $user->isAnon() ) { |
| 368 | return [ |
| 369 | 'UserID' => false, |
| 370 | 'Token' => false, |
| 371 | ]; |
| 372 | } else { |
| 373 | return [ |
| 374 | 'UserID' => $user->getId(), |
| 375 | 'UserName' => $user->getName(), |
| 376 | 'Token' => $remember ? (string)$user->getToken() : false, |
| 377 | ]; |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | /** |
| 382 | * Return extra data to store in the session |
| 383 | * @param User $user |
| 384 | * @return array |
| 385 | */ |
| 386 | protected function sessionDataToExport( $user ) { |
| 387 | return []; |
| 388 | } |
| 389 | |
| 390 | public function whyNoSession() { |
| 391 | return wfMessage( 'sessionprovider-nocookies' ); |
| 392 | } |
| 393 | |
| 394 | public function getRememberUserDuration() { |
| 395 | return min( $this->getLoginCookieExpiration( 'UserID', true ), |
| 396 | $this->getLoginCookieExpiration( 'Token', true ) ) ?: null; |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * Gets the list of cookies that must be set to the 'remember me' duration, |
| 401 | * if $wgExtendedLoginCookieExpiration is in use. |
| 402 | * |
| 403 | * @return string[] Array of unprefixed cookie keys |
| 404 | */ |
| 405 | protected function getExtendedLoginCookies() { |
| 406 | return [ 'UserID', 'UserName', 'Token' ]; |
| 407 | } |
| 408 | |
| 409 | /** |
| 410 | * Returns the lifespan of the login cookies, in seconds. 0 means until the end of the session. |
| 411 | * |
| 412 | * Cookies that are session-length do not call this function. |
| 413 | * |
| 414 | * @param string $cookieName |
| 415 | * @param bool $shouldRememberUser Whether the user should be remembered |
| 416 | * long-term |
| 417 | * @return int Cookie expiration time in seconds; 0 for session cookies |
| 418 | */ |
| 419 | protected function getLoginCookieExpiration( $cookieName, $shouldRememberUser ) { |
| 420 | $extendedCookies = $this->getExtendedLoginCookies(); |
| 421 | $normalExpiration = $this->getConfig()->get( MainConfigNames::CookieExpiration ); |
| 422 | |
| 423 | if ( $shouldRememberUser && in_array( $cookieName, $extendedCookies, true ) ) { |
| 424 | $extendedExpiration = $this->getConfig()->get( MainConfigNames::ExtendedLoginCookieExpiration ); |
| 425 | |
| 426 | return ( $extendedExpiration !== null ) ? (int)$extendedExpiration : (int)$normalExpiration; |
| 427 | } else { |
| 428 | return (int)$normalExpiration; |
| 429 | } |
| 430 | } |
| 431 | } |