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| 1 | <?php |
| 2 | /** |
| 3 | * @section LICENSE |
| 4 | * This file is part of the MediaWiki OAuth Client library |
| 5 | * |
| 6 | * The MediaWiki OAuth Client libraryis free software: you can |
| 7 | * redistribute it and/or modify it under the terms of the GNU General Public |
| 8 | * License as published by the Free Software Foundation, either version 3 of |
| 9 | * the License, or (at your option) any later version. |
| 10 | * |
| 11 | * The MediaWiki OAuth Client library is distributed in the hope that it |
| 12 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
| 13 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along |
| 17 | * with the MediaWiki OAuth Client library. If not, see |
| 18 | * <http://www.gnu.org/licenses/>. |
| 19 | * |
| 20 | * @file |
| 21 | * @copyright © 2015 Chris Steipp, Wikimedia Foundation and contributors. |
| 22 | */ |
| 23 | |
| 24 | namespace MediaWiki\OAuthClient; |
| 25 | |
| 26 | use MediaWiki\OAuthClient\SignatureMethod\HmacSha1; |
| 27 | use Psr\Log\LoggerAwareInterface; |
| 28 | use Psr\Log\LoggerInterface; |
| 29 | use Psr\Log\NullLogger; |
| 30 | use stdClass; |
| 31 | |
| 32 | /** |
| 33 | * MediaWiki OAuth client. |
| 34 | */ |
| 35 | class Client implements LoggerAwareInterface { |
| 36 | |
| 37 | /** |
| 38 | * Number of seconds by which IAT (token issue time) can be larger than current time, to account |
| 39 | * for clock drift. |
| 40 | * @var int |
| 41 | */ |
| 42 | public const IAT_TOLERANCE = 2; |
| 43 | |
| 44 | /** |
| 45 | * @var LoggerInterface |
| 46 | */ |
| 47 | protected $logger; |
| 48 | |
| 49 | /** |
| 50 | * @var ClientConfig |
| 51 | */ |
| 52 | private $config; |
| 53 | |
| 54 | /** |
| 55 | * Any extra params in the call that need to be signed |
| 56 | * @var array |
| 57 | */ |
| 58 | private $extraParams = []; |
| 59 | |
| 60 | /** |
| 61 | * url, defaults to oob |
| 62 | * @var string |
| 63 | */ |
| 64 | private $callbackUrl = 'oob'; |
| 65 | |
| 66 | /** |
| 67 | * Track the last random nonce generated by the OAuth lib, used to verify |
| 68 | * /identity response isn't a replay |
| 69 | * @var string |
| 70 | */ |
| 71 | private $lastNonce; |
| 72 | |
| 73 | /** |
| 74 | * @param ClientConfig $config |
| 75 | * @param LoggerInterface|null $logger |
| 76 | */ |
| 77 | public function __construct( |
| 78 | ClientConfig $config, |
| 79 | ?LoggerInterface $logger = null |
| 80 | ) { |
| 81 | $this->config = $config; |
| 82 | $this->logger = $logger ?: new NullLogger(); |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * @inheritDoc |
| 87 | */ |
| 88 | public function setLogger( LoggerInterface $logger ): void { |
| 89 | $this->logger = $logger; |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * @param string $url |
| 94 | * @param string $key |
| 95 | * @param string $secret |
| 96 | * @return Client |
| 97 | */ |
| 98 | public static function newFromKeyAndSecret( $url, $key, $secret ) { |
| 99 | $config = new ClientConfig( $url, true, true ); |
| 100 | $config->setConsumer( new Consumer( $key, $secret ) ); |
| 101 | return new static( $config ); |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Set an extra param in the call that need to be signed. |
| 106 | * This should only be needed for OAuth internals. |
| 107 | * @param string $key |
| 108 | * @param string $value |
| 109 | */ |
| 110 | public function setExtraParam( $key, $value ) { |
| 111 | $this->extraParams[$key] = $value; |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * @param array $params |
| 116 | * @see setExtraParam |
| 117 | */ |
| 118 | public function setExtraParams( array $params ) { |
| 119 | $this->extraParams = $params; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Set callback URL for OAuth handshake |
| 124 | * @param string $url |
| 125 | */ |
| 126 | public function setCallback( $url ) { |
| 127 | $this->callbackUrl = $url; |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * First part of 3-legged OAuth, get the request Token. |
| 132 | * Redirect your authorizing users to the redirect url, and keep |
| 133 | * track of the request token since you need to pass it into complete() |
| 134 | * |
| 135 | * @return array [redirect, request/temp token] |
| 136 | * @throws Exception When the server returns an error or a malformed response |
| 137 | */ |
| 138 | public function initiate() { |
| 139 | $initUrl = $this->config->endpointURL . |
| 140 | '/initiate&format=json&oauth_callback=' . |
| 141 | urlencode( $this->callbackUrl ); |
| 142 | $data = $this->makeOAuthCall( null, $initUrl ); |
| 143 | $return = $this->decodeJson( $data ); |
| 144 | if ( property_exists( $return, 'error' ) ) { |
| 145 | $this->logger->error( |
| 146 | 'OAuth server error {error}: {msg}', |
| 147 | [ 'error' => $return->error, 'msg' => $return->message ] |
| 148 | ); |
| 149 | throw new Exception( "Server returned error: $return->message" ); |
| 150 | } |
| 151 | if ( !property_exists( $return, 'oauth_callback_confirmed' ) || |
| 152 | $return->oauth_callback_confirmed !== 'true' |
| 153 | ) { |
| 154 | throw new Exception( "Callback wasn't confirmed" ); |
| 155 | } |
| 156 | $requestToken = new Token( $return->key, $return->secret ); |
| 157 | $subPage = $this->config->authenticateOnly ? 'authenticate' : 'authorize'; |
| 158 | $url = $this->config->redirURL ?: |
| 159 | ( $this->config->endpointURL . "/" . $subPage . "&" ); |
| 160 | $url .= "oauth_token={$requestToken->key}&oauth_consumer_key={$this->config->consumer->key}"; |
| 161 | return [ $url, $requestToken ]; |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * The final leg of the OAuth handshake. Exchange the request Token from |
| 166 | * initiate() and the verification code that the user submitted back to you |
| 167 | * for an access token, which you'll use for all API calls. |
| 168 | * |
| 169 | * @param Token $requestToken Authorization code sent to the callback url |
| 170 | * @param string $verifyCode Temp/request token obtained from initiate, or null if this |
| 171 | * object was used and the token is already set. |
| 172 | * @return Token The access token |
| 173 | * @throws Exception On failed handshakes |
| 174 | */ |
| 175 | public function complete( Token $requestToken, $verifyCode ) { |
| 176 | $tokenUrl = $this->config->endpointURL . '/token&format=json'; |
| 177 | $this->setExtraParam( 'oauth_verifier', $verifyCode ); |
| 178 | |
| 179 | $data = $this->makeOAuthCall( $requestToken, $tokenUrl ); |
| 180 | $return = $this->decodeJson( $data ); |
| 181 | |
| 182 | if ( property_exists( $return, 'error' ) ) { |
| 183 | $this->logger->error( |
| 184 | 'OAuth server error {error}: {msg}', |
| 185 | [ 'error' => $return->error, 'msg' => $return->message ] |
| 186 | ); |
| 187 | throw new Exception( |
| 188 | "Handshake error: $return->message ($return->error)" |
| 189 | ); |
| 190 | } elseif ( |
| 191 | !property_exists( $return, 'key' ) || |
| 192 | !property_exists( $return, 'secret' ) |
| 193 | ) { |
| 194 | $this->logger->error( |
| 195 | 'Could not parse OAuth server response: {data}', |
| 196 | [ 'data' => $data ] |
| 197 | ); |
| 198 | throw new Exception( |
| 199 | "Server response missing expected values (Raw response: $data)" |
| 200 | ); |
| 201 | } |
| 202 | $accessToken = new Token( $return->key, $return->secret ); |
| 203 | // Cleanup after ourselves |
| 204 | $this->setExtraParams( [] ); |
| 205 | return $accessToken; |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * Optional step. This call the MediaWiki specific /identify method, which |
| 210 | * returns a signed statement of the authorizing user's identity. Use this |
| 211 | * if you are authenticating users in your application, and you need to |
| 212 | * know their username, groups, rights, etc in MediaWiki. |
| 213 | * |
| 214 | * @param Token $accessToken Access token from complete() |
| 215 | * @return stdClass An object containing attributes of the user |
| 216 | * @throws Exception On malformed server response or invalid JWT |
| 217 | */ |
| 218 | public function identify( Token $accessToken ) { |
| 219 | $identifyUrl = $this->config->endpointURL . '/identify'; |
| 220 | $data = $this->makeOAuthCall( $accessToken, $identifyUrl ); |
| 221 | $identity = $this->decodeJWT( $data, $this->config->consumer->secret ); |
| 222 | if ( !$this->validateJWT( |
| 223 | $identity, |
| 224 | $this->config->consumer->key, |
| 225 | $this->config->canonicalServerUrl, |
| 226 | $this->lastNonce |
| 227 | ) ) { |
| 228 | throw new Exception( "JWT didn't validate" ); |
| 229 | } |
| 230 | return $identity; |
| 231 | } |
| 232 | |
| 233 | /** |
| 234 | * Make a signed request to MediaWiki |
| 235 | * |
| 236 | * @param Token $token additional token to use in signature, besides |
| 237 | * the consumer token. In most cases, this will be the access token you |
| 238 | * got from complete(), but we set it to the request token when |
| 239 | * finishing the handshake. |
| 240 | * @param string $url URL to call |
| 241 | * @param bool $isPost true if this should be a POST request |
| 242 | * @param array|null $postFields POST parameters, only if $isPost is also true |
| 243 | * @return string Body from the curl request |
| 244 | * @throws Exception On curl failure |
| 245 | */ |
| 246 | public function makeOAuthCall( |
| 247 | /*Token*/ $token, $url, $isPost = false, ?array $postFields = null |
| 248 | ) { |
| 249 | // Figure out if there is a file in postFields |
| 250 | $hasFile = false; |
| 251 | if ( is_array( $postFields ) ) { |
| 252 | foreach ( $postFields as $field ) { |
| 253 | if ( is_a( $field, 'CurlFile' ) ) { |
| 254 | $hasFile = true; |
| 255 | break; |
| 256 | } |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | $params = []; |
| 261 | // Get any params from the url |
| 262 | if ( strpos( $url, '?' ) ) { |
| 263 | $parsed = parse_url( $url ); |
| 264 | parse_str( $parsed['query'], $params ); |
| 265 | } |
| 266 | $params += $this->extraParams; |
| 267 | if ( $isPost && $postFields && !$hasFile ) { |
| 268 | $params += $postFields; |
| 269 | } |
| 270 | $method = $isPost ? 'POST' : 'GET'; |
| 271 | $req = Request::fromConsumerAndToken( |
| 272 | $this->config->consumer, |
| 273 | $token, |
| 274 | $method, |
| 275 | $url, |
| 276 | $params |
| 277 | ); |
| 278 | $req->signRequest( |
| 279 | new HmacSha1(), |
| 280 | $this->config->consumer, |
| 281 | $token |
| 282 | ); |
| 283 | $this->lastNonce = $req->getParameter( 'oauth_nonce' ); |
| 284 | return $this->makeCurlCall( |
| 285 | $url, |
| 286 | $req->toHeader(), |
| 287 | $isPost, |
| 288 | $postFields, |
| 289 | $hasFile |
| 290 | ); |
| 291 | } |
| 292 | |
| 293 | /** |
| 294 | * @param string $url |
| 295 | * @param array $authorizationHeader |
| 296 | * @param bool $isPost |
| 297 | * @param array|null $postFields |
| 298 | * @param bool $hasFile |
| 299 | * @return string |
| 300 | * @throws Exception On curl failure |
| 301 | */ |
| 302 | private function makeCurlCall( |
| 303 | $url, $authorizationHeader, $isPost, ?array $postFields = null, $hasFile = false |
| 304 | ) { |
| 305 | if ( !$hasFile && $postFields ) { |
| 306 | $postFields = http_build_query( $postFields ); |
| 307 | } |
| 308 | |
| 309 | $ch = curl_init(); |
| 310 | curl_setopt( $ch, CURLOPT_URL, (string)$url ); |
| 311 | curl_setopt( $ch, CURLOPT_HEADER, 0 ); |
| 312 | curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 ); |
| 313 | |
| 314 | $headers = [ |
| 315 | $authorizationHeader |
| 316 | ]; |
| 317 | if ( $this->config->userAgent !== null ) { |
| 318 | $headers[] = 'User-Agent: ' . $this->config->userAgent; |
| 319 | } |
| 320 | curl_setopt( $ch, CURLOPT_HTTPHEADER, $headers ); |
| 321 | |
| 322 | if ( $isPost ) { |
| 323 | curl_setopt( $ch, CURLOPT_POST, true ); |
| 324 | curl_setopt( $ch, CURLOPT_POSTFIELDS, $postFields ); |
| 325 | } |
| 326 | if ( $this->config->useSSL ) { |
| 327 | curl_setopt( $ch, CURLOPT_PORT, 443 ); |
| 328 | } |
| 329 | if ( $this->config->verifySSL ) { |
| 330 | curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, true ); |
| 331 | curl_setopt( $ch, CURLOPT_SSL_VERIFYHOST, 2 ); |
| 332 | } else { |
| 333 | curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, false ); |
| 334 | curl_setopt( $ch, CURLOPT_SSL_VERIFYHOST, 0 ); |
| 335 | } |
| 336 | $data = curl_exec( $ch ); |
| 337 | if ( !$data ) { |
| 338 | if ( curl_errno( $ch ) ) { |
| 339 | throw new Exception( 'Curl error: ' . curl_error( $ch ) ); |
| 340 | } else { |
| 341 | throw new Exception( 'Empty HTTP response! Status: ' |
| 342 | . curl_getinfo( $ch, CURLINFO_HTTP_CODE ) ); |
| 343 | } |
| 344 | } |
| 345 | return $data; |
| 346 | } |
| 347 | |
| 348 | /** |
| 349 | * @param string $JWT Json web token |
| 350 | * @param string $secret |
| 351 | * @return stdClass |
| 352 | * @throws Exception On invalid JWT signature |
| 353 | */ |
| 354 | private function decodeJWT( $JWT, $secret ) { |
| 355 | $jwtParts = explode( '.', $JWT ); |
| 356 | if ( count( $jwtParts ) !== 3 ) { |
| 357 | throw new Exception( "JWT has incorrect format. Received: $JWT" ); |
| 358 | } |
| 359 | [ $headb64, $bodyb64, $sigb64 ] = $jwtParts; |
| 360 | $header = $this->decodeJson( $this->urlsafeB64Decode( $headb64 ) ); |
| 361 | $payload = $this->decodeJson( $this->urlsafeB64Decode( $bodyb64 ) ); |
| 362 | $sig = $this->urlsafeB64Decode( $sigb64 ); |
| 363 | // MediaWiki will only use sha256 hmac (HS256) for now. This check |
| 364 | // makes sure an attacker doesn't return a JWT with 'none' signature |
| 365 | // type. |
| 366 | $expectSig = hash_hmac( |
| 367 | 'sha256', "{$headb64}.{$bodyb64}", $secret, true |
| 368 | ); |
| 369 | if ( $header->alg !== 'HS256' || !$this->compareHash( $sig, $expectSig ) ) { |
| 370 | throw new Exception( "Invalid JWT signature from /identify." ); |
| 371 | } |
| 372 | return $payload; |
| 373 | } |
| 374 | |
| 375 | /** |
| 376 | * @param stdClass $identity |
| 377 | * @param string $consumerKey |
| 378 | * @param string $expectedConnonicalServer |
| 379 | * @param string $nonce |
| 380 | * @return bool |
| 381 | */ |
| 382 | protected function validateJWT( |
| 383 | $identity, $consumerKey, $expectedConnonicalServer, $nonce |
| 384 | ) { |
| 385 | // Verify the issuer is who we expect (server sends $wgCanonicalServer) |
| 386 | if ( $identity->iss !== $expectedConnonicalServer ) { |
| 387 | $this->logger->info( |
| 388 | "Invalid issuer '{$identity->iss}': expected '{$expectedConnonicalServer}'" ); |
| 389 | return false; |
| 390 | } |
| 391 | // Verify we are the intended audience |
| 392 | if ( $identity->aud !== $consumerKey ) { |
| 393 | $this->logger->info( "Invalid audience '{$identity->aud}': expected '{$consumerKey}'" ); |
| 394 | return false; |
| 395 | } |
| 396 | // Verify we are within the time limits of the token. Issued at (iat) |
| 397 | // should be in the past, Expiration (exp) should be in the future. |
| 398 | $now = time(); |
| 399 | if ( $identity->iat > $now + static::IAT_TOLERANCE || $identity->exp < $now ) { |
| 400 | $this->logger->info( |
| 401 | "Invalid times issued='{$identity->iat}', " . |
| 402 | "expires='{$identity->exp}', now='{$now}'" |
| 403 | ); |
| 404 | return false; |
| 405 | } |
| 406 | // Verify we haven't seen this nonce before, which would indicate a replay attack |
| 407 | if ( $identity->nonce !== $nonce ) { |
| 408 | $this->logger->info( "Invalid nonce '{$identity->nonce}': expected '{$nonce}'" ); |
| 409 | return false; |
| 410 | } |
| 411 | return true; |
| 412 | } |
| 413 | |
| 414 | /** |
| 415 | * @param string $input |
| 416 | * @return string |
| 417 | * @throws Exception If the input could not be decoded. |
| 418 | */ |
| 419 | private function urlsafeB64Decode( $input ) { |
| 420 | // Pad the input with equals characters to the right to make it the correct length. |
| 421 | $remainder = strlen( $input ) % 4; |
| 422 | if ( $remainder ) { |
| 423 | $padlen = 4 - $remainder; |
| 424 | $input .= str_repeat( '=', $padlen ); |
| 425 | } |
| 426 | // Decode the string. |
| 427 | $decoded = base64_decode( strtr( $input, '-_', '+/' ), true ); |
| 428 | if ( $decoded === false ) { |
| 429 | throw new Exception( "Unable to decode base64 value: $input" ); |
| 430 | } |
| 431 | return $decoded; |
| 432 | } |
| 433 | |
| 434 | /** |
| 435 | * Constant time comparison |
| 436 | * @param string $hash1 |
| 437 | * @param string $hash2 |
| 438 | * @return bool |
| 439 | */ |
| 440 | private function compareHash( $hash1, $hash2 ) { |
| 441 | $result = strlen( $hash1 ) ^ strlen( $hash2 ); |
| 442 | $len = min( strlen( $hash1 ), strlen( $hash2 ) ) - 1; |
| 443 | for ( $i = 0; $i < $len; $i++ ) { |
| 444 | $result |= ord( $hash1[$i] ) ^ ord( $hash2[$i] ); |
| 445 | } |
| 446 | return $result == 0; |
| 447 | } |
| 448 | |
| 449 | /** |
| 450 | * Like json_decode but with sane error handling. |
| 451 | * Assumes that null is not a valid value for the JSON string. |
| 452 | * @param string $json |
| 453 | * @return mixed |
| 454 | * @throws Exception On invalid JSON |
| 455 | */ |
| 456 | private function decodeJson( $json ) { |
| 457 | $error = $errorMsg = null; |
| 458 | $return = json_decode( $json ); |
| 459 | if ( $return === null && trim( $json ) !== 'null' ) { |
| 460 | $error = json_last_error(); |
| 461 | $errorMsg = json_last_error_msg(); |
| 462 | } elseif ( !$return || !is_object( $return ) ) { |
| 463 | $error = 128; |
| 464 | $errorMsg = 'Response must be an object'; |
| 465 | } |
| 466 | |
| 467 | if ( $error ) { |
| 468 | $this->logger->error( |
| 469 | 'Failed to decode server response as JSON: {message}', |
| 470 | [ |
| 471 | 'response' => $json, |
| 472 | 'code' => json_last_error(), |
| 473 | 'message' => json_last_error_msg(), |
| 474 | ] |
| 475 | ); |
| 476 | throw new Exception( 'Decoding server response failed: ' . json_last_error_msg() |
| 477 | . " (Raw response: $json)" ); |
| 478 | } |
| 479 | return $return; |
| 480 | } |
| 481 | |
| 482 | } |