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<?php /* * Copyright 2019 Google LLC * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. / namespace Google\Site_Kit_Dependencies\Google\Auth; use DateTime; use Exception; use Google\Site_Kit_Dependencies\Firebase\JWT\ExpiredException; use Google\Site_Kit_Dependencies\Firebase\JWT\JWT; use Google\Site_Kit_Dependencies\Firebase\JWT\Key; use Google\Site_Kit_Dependencies\Firebase\JWT\SignatureInvalidException; use Google\Site_Kit_Dependencies\Google\Auth\Cache\MemoryCacheItemPool; use Google\Site_Kit_Dependencies\Google\Auth\HttpHandler\HttpClientCache; use Google\Site_Kit_Dependencies\Google\Auth\HttpHandler\HttpHandlerFactory; use Google\Site_Kit_Dependencies\GuzzleHttp\Psr7\Request; use Google\Site_Kit_Dependencies\GuzzleHttp\Psr7\Utils; use InvalidArgumentException; use Google\Site_Kit_Dependencies\phpseclib\Crypt\RSA; use Google\Site_Kit_Dependencies\phpseclib\Math\BigInteger as BigInteger2; use Google\Site_Kit_Dependencies\phpseclib3\Crypt\PublicKeyLoader; use Google\Site_Kit_Dependencies\phpseclib3\Math\BigInteger as BigInteger3; use Google\Site_Kit_Dependencies\Psr\Cache\CacheItemPoolInterface; use RuntimeException; use Google\Site_Kit_Dependencies\SimpleJWT\InvalidTokenException; use Google\Site_Kit_Dependencies\SimpleJWT\JWT as SimpleJWT; use Google\Site_Kit_Dependencies\SimpleJWT\Keys\KeyFactory; use Google\Site_Kit_Dependencies\SimpleJWT\Keys\KeySet; use UnexpectedValueException; /* * Wrapper around Google Access Tokens which provides convenience functions. * * @experimental / class AccessToken { const FEDERATED_SIGNON_CERT_URL = 'https://www.googleapis.com/oauth2/v3/certs'; const IAP_CERT_URL = 'https://www.gstatic.com/iap/verify/public_key-jwk'; const IAP_ISSUER = 'https://cloud.google.com/iap'; const OAUTH2_ISSUER = 'accounts.google.com'; const OAUTH2_ISSUER_HTTPS = 'https://accounts.google.com'; const OAUTH2_REVOKE_URI = 'https://oauth2.googleapis.com/revoke'; /* * @var callable / private $httpHandler; /* * @var CacheItemPoolInterface / private $cache; /* * @param callable $httpHandler [optional] An HTTP Handler to deliver PSR-7 requests. * @param CacheItemPoolInterface $cache [optional] A PSR-6 compatible cache implementation. / public function __construct(callable $httpHandler = null, \Google\Site_Kit_Dependencies\Psr\Cache\CacheItemPoolInterface $cache = null) { $this->httpHandler = $httpHandler ?: \Google\Site_Kit_Dependencies\Google\Auth\HttpHandler\HttpHandlerFactory::build(\Google\Site_Kit_Dependencies\Google\Auth\HttpHandler\HttpClientCache::getHttpClient()); $this->cache = $cache ?: new \Google\Site_Kit_Dependencies\Google\Auth\Cache\MemoryCacheItemPool(); } /* * Verifies an id token and returns the authenticated apiLoginTicket. * Throws an exception if the id token is not valid. * The audience parameter can be used to control which id tokens are * accepted. By default, the id token must have been issued to this OAuth2 client. * * @param string $token The JSON Web Token to be verified. * @param array<mixed> $options [optional] { * Configuration options. * @type string $audience The indended recipient of the token. * @type string $issuer The intended issuer of the token. * @type string $cacheKey The cache key of the cached certs. Defaults to * the sha1 of $certsLocation if provided, otherwise is set to * "federated_signon_certs_v3". * @type string $certsLocation The location (remote or local) from which * to retrieve certificates, if not cached. This value should only be * provided in limited circumstances in which you are sure of the * behavior. * @type bool $throwException Whether the function should throw an * exception if the verification fails. This is useful for * determining the reason verification failed. * } * @return array<mixed>\|false the token payload, if successful, or false if not. * @throws InvalidArgumentException If certs could not be retrieved from a local file. * @throws InvalidArgumentException If received certs are in an invalid format. * @throws InvalidArgumentException If the cert alg is not supported. * @throws RuntimeException If certs could not be retrieved from a remote location. * @throws UnexpectedValueException If the token issuer does not match. * @throws UnexpectedValueException If the token audience does not match. / public function verify($token, array $options = []) { $audience = isset($options['audience']) ? $options['audience'] : null; $issuer = isset($options['issuer']) ? $options['issuer'] : null; $certsLocation = isset($options['certsLocation']) ? $options['certsLocation'] : self::FEDERATED_SIGNON_CERT_URL; $cacheKey = isset($options['cacheKey']) ? $options['cacheKey'] : $this->getCacheKeyFromCertLocation($certsLocation); $throwException = isset($options['throwException']) ? $options['throwException'] : \false; // for backwards compatibility // Check signature against each available cert. $certs = $this->getCerts($certsLocation, $cacheKey, $options); $alg = $this->determineAlg($certs); if (!\in_array($alg, ['RS256', 'ES256'])) { throw new \InvalidArgumentException('unrecognized "alg" in certs, expected ES256 or RS256'); } try { if ($alg == 'RS256') { return $this->verifyRs256($token, $certs, $audience, $issuer); } return $this->verifyEs256($token, $certs, $audience, $issuer); } catch (\Google\Site_Kit_Dependencies\Firebase\JWT\ExpiredException $e) { // firebase/php-jwt 5+ } catch (\Google\Site_Kit_Dependencies\Firebase\JWT\SignatureInvalidException $e) { // firebase/php-jwt 5+ } catch (\Google\Site_Kit_Dependencies\SimpleJWT\InvalidTokenException $e) { // simplejwt } catch (\InvalidArgumentException $e) { } catch (\UnexpectedValueException $e) { } if ($throwException) { throw $e; } return \false; } /* * Identifies the expected algorithm to verify by looking at the "alg" key * of the provided certs. * * @param array<mixed> $certs Certificate array according to the JWK spec (see * https://tools.ietf.org/html/rfc7517). * @return string The expected algorithm, such as "ES256" or "RS256". / private function determineAlg(array $certs) { $alg = null; foreach ($certs as $cert) { if (empty($cert['alg'])) { throw new \InvalidArgumentException('certs expects "alg" to be set'); } $alg = $alg ?: $cert['alg']; if ($alg != $cert['alg']) { throw new \InvalidArgumentException('More than one alg detected in certs'); } } return $alg; } /* * Verifies an ES256-signed JWT. * * @param string $token The JSON Web Token to be verified. * @param array<mixed> $certs Certificate array according to the JWK spec (see * https://tools.ietf.org/html/rfc7517). * @param string\|null $audience If set, returns false if the provided * audience does not match the "aud" claim on the JWT. * @param string\|null $issuer If set, returns false if the provided * issuer does not match the "iss" claim on the JWT. * @return array<mixed> the token payload, if successful, or false if not. / private function verifyEs256($token, array $certs, $audience = null, $issuer = null) { $this->checkSimpleJwt(); $jwkset = new \Google\Site_Kit_Dependencies\SimpleJWT\Keys\KeySet(); foreach ($certs as $cert) { $jwkset->add(\Google\Site_Kit_Dependencies\SimpleJWT\Keys\KeyFactory::create($cert, 'php')); } // Validate the signature using the key set and ES256 algorithm. $jwt = $this->callSimpleJwtDecode([$token, $jwkset, 'ES256']); $payload = $jwt->getClaims(); if ($audience) { if (!isset($payload['aud']) \|\| $payload['aud'] != $audience) { throw new \UnexpectedValueException('Audience does not match'); } } // @see https://cloud.google.com/iap/docs/signed-headers-howto#verifying_the_jwt_payload $issuer = $issuer ?: self::IAP_ISSUER; if (!isset($payload['iss']) \|\| $payload['iss'] !== $issuer) { throw new \UnexpectedValueException('Issuer does not match'); } return $payload; } /* * Verifies an RS256-signed JWT. * * @param string $token The JSON Web Token to be verified. * @param array<mixed> $certs Certificate array according to the JWK spec (see * https://tools.ietf.org/html/rfc7517). * @param string\|null $audience If set, returns false if the provided * audience does not match the "aud" claim on the JWT. * @param string\|null $issuer If set, returns false if the provided * issuer does not match the "iss" claim on the JWT. * @return array<mixed> the token payload, if successful, or false if not. / private function verifyRs256($token, array $certs, $audience = null, $issuer = null) { $this->checkAndInitializePhpsec(); $keys = []; foreach ($certs as $cert) { if (empty($cert['kid'])) { throw new \InvalidArgumentException('certs expects "kid" to be set'); } if (empty($cert['n']) \|\| empty($cert['e'])) { throw new \InvalidArgumentException('RSA certs expects "n" and "e" to be set'); } $publicKey = $this->loadPhpsecPublicKey($cert['n'], $cert['e']); // create an array of key IDs to certs for the JWT library $keys[$cert['kid']] = new \Google\Site_Kit_Dependencies\Firebase\JWT\Key($publicKey, 'RS256'); } $payload = $this->callJwtStatic('decode', [$token, $keys]); if ($audience) { if (!\property_exists($payload, 'aud') \|\| $payload->aud != $audience) { throw new \UnexpectedValueException('Audience does not match'); } } // support HTTP and HTTPS issuers // @see https://developers.google.com/identity/sign-in/web/backend-auth $issuers = $issuer ? [$issuer] : [self::OAUTH2_ISSUER, self::OAUTH2_ISSUER_HTTPS]; if (!isset($payload->iss) \|\| !\in_array($payload->iss, $issuers)) { throw new \UnexpectedValueException('Issuer does not match'); } return (array) $payload; } /* * Revoke an OAuth2 access token or refresh token. This method will revoke the current access * token, if a token isn't provided. * * @param string\|array<mixed> $token The token (access token or a refresh token) that should be revoked. * @param array<mixed> $options [optional] Configuration options. * @return bool Returns True if the revocation was successful, otherwise False. / public function revoke($token, array $options = []) { if (\is_array($token)) { if (isset($token['refresh_token'])) { $token = $token['refresh_token']; } else { $token = $token['access_token']; } } $body = \Google\Site_Kit_Dependencies\GuzzleHttp\Psr7\Utils::streamFor(\http_build_query(['token' => $token])); $request = new \Google\Site_Kit_Dependencies\GuzzleHttp\Psr7\Request('POST', self::OAUTH2_REVOKE_URI, ['Cache-Control' => 'no-store', 'Content-Type' => 'application/x-www-form-urlencoded'], $body); $httpHandler = $this->httpHandler; $response = $httpHandler($request, $options); return $response->getStatusCode() == 200; } /* * Gets federated sign-on certificates to use for verifying identity tokens. * Returns certs as array structure, where keys are key ids, and values * are PEM encoded certificates. * * @param string $location The location from which to retrieve certs. * @param string $cacheKey The key under which to cache the retrieved certs. * @param array<mixed> $options [optional] Configuration options. * @return array<mixed> * @throws InvalidArgumentException If received certs are in an invalid format. / private function getCerts($location, $cacheKey, array $options = []) { $cacheItem = $this->cache->getItem($cacheKey); $certs = $cacheItem ? $cacheItem->get() : null; $gotNewCerts = \false; if (!$certs) { $certs = $this->retrieveCertsFromLocation($location, $options); $gotNewCerts = \true; } if (!isset($certs['keys'])) { if ($location !== self::IAP_CERT_URL) { throw new \InvalidArgumentException('federated sign-on certs expects "keys" to be set'); } throw new \InvalidArgumentException('certs expects "keys" to be set'); } // Push caching off until after verifying certs are in a valid format. // Don't want to cache bad data. if ($gotNewCerts) { $cacheItem->expiresAt(new \DateTime('+1 hour')); $cacheItem->set($certs); $this->cache->save($cacheItem); } return $certs['keys']; } /* * Retrieve and cache a certificates file. * * @param string $url location * @param array<mixed> $options [optional] Configuration options. * @return array<mixed> certificates * @throws InvalidArgumentException If certs could not be retrieved from a local file. * @throws RuntimeException If certs could not be retrieved from a remote location. / private function retrieveCertsFromLocation($url, array $options = []) { // If we're retrieving a local file, just grab it. if (\strpos($url, 'http') !== 0) { if (!\file_exists($url)) { throw new \InvalidArgumentException(\sprintf('Failed to retrieve verification certificates from path: %s.', $url)); } return \json_decode((string) \file_get_contents($url), \true); } $httpHandler = $this->httpHandler; $response = $httpHandler(new \Google\Site_Kit_Dependencies\GuzzleHttp\Psr7\Request('GET', $url), $options); if ($response->getStatusCode() == 200) { return \json_decode((string) $response->getBody(), \true); } throw new \RuntimeException(\sprintf('Failed to retrieve verification certificates: "%s".', $response->getBody()->getContents()), $response->getStatusCode()); } /* * @return void / private function checkAndInitializePhpsec() { if (!$this->checkAndInitializePhpsec2() && !$this->checkPhpsec3()) { throw new \RuntimeException('Please require phpseclib/phpseclib v2 or v3 to use this utility.'); } } private function loadPhpsecPublicKey(string $modulus, string $exponent) : string { if (\class_exists(\Google\Site_Kit_Dependencies\phpseclib\Crypt\RSA::class) && \class_exists(\Google\Site_Kit_Dependencies\phpseclib\Math\BigInteger::class)) { $key = new \Google\Site_Kit_Dependencies\phpseclib\Crypt\RSA(); $key->loadKey(['n' => new \Google\Site_Kit_Dependencies\phpseclib\Math\BigInteger($this->callJwtStatic('urlsafeB64Decode', [$modulus]), 256), 'e' => new \Google\Site_Kit_Dependencies\phpseclib\Math\BigInteger($this->callJwtStatic('urlsafeB64Decode', [$exponent]), 256)]); return $key->getPublicKey(); } $key = \Google\Site_Kit_Dependencies\phpseclib3\Crypt\PublicKeyLoader::load(['n' => new \Google\Site_Kit_Dependencies\phpseclib3\Math\BigInteger($this->callJwtStatic('urlsafeB64Decode', [$modulus]), 256), 'e' => new \Google\Site_Kit_Dependencies\phpseclib3\Math\BigInteger($this->callJwtStatic('urlsafeB64Decode', [$exponent]), 256)]); return $key->toString('PKCS1'); } /* * @return bool / private function checkAndInitializePhpsec2() : bool { if (!\class_exists('Google\\Site_Kit_Dependencies\\phpseclib\\Crypt\\RSA')) { return \false; } /* * phpseclib calls "phpinfo" by default, which requires special * whitelisting in the AppEngine VM environment. This function * sets constants to bypass the need for phpseclib to check phpinfo * * @see phpseclib/Math/BigInteger * @see https://github.com/GoogleCloudPlatform/getting-started-php/issues/85 * @codeCoverageIgnore / if (\filter_var(\getenv('GAE_VM'), \FILTER_VALIDATE_BOOLEAN)) { if (!\defined('Google\\Site_Kit_Dependencies\\MATH_BIGINTEGER_OPENSSL_ENABLED')) { \define('Google\\Site_Kit_Dependencies\\MATH_BIGINTEGER_OPENSSL_ENABLED', \true); } if (!\defined('Google\\Site_Kit_Dependencies\\CRYPT_RSA_MODE')) { \define('Google\\Site_Kit_Dependencies\\CRYPT_RSA_MODE', \Google\Site_Kit_Dependencies\phpseclib\Crypt\RSA::MODE_OPENSSL); } } return \true; } /* * @return bool / private function checkPhpsec3() : bool { return \class_exists('Google\\Site_Kit_Dependencies\\phpseclib3\\Crypt\\RSA'); } /* * @return void / private function checkSimpleJwt() { // @codeCoverageIgnoreStart if (!\class_exists(\Google\Site_Kit_Dependencies\SimpleJWT\JWT::class)) { throw new \RuntimeException('Please require kelvinmo/simplejwt ^0.2 to use this utility.'); } // @codeCoverageIgnoreEnd } /* * Provide a hook to mock calls to the JWT static methods. * * @param string $method * @param array<mixed> $args * @return mixed / protected function callJwtStatic($method, array $args = []) { return \call_user_func_array([\Google\Site_Kit_Dependencies\Firebase\JWT\JWT::class, $method], $args); // @phpstan-ignore-line } /* * Provide a hook to mock calls to the JWT static methods. * * @param array<mixed> $args * @return mixed / protected function callSimpleJwtDecode(array $args = []) { return \call_user_func_array([\Google\Site_Kit_Dependencies\SimpleJWT\JWT::class, 'decode'], $args); } /* * Generate a cache key based on the cert location using sha1 with the * exception of using "federated_signon_certs_v3" to preserve BC. * * @param string $certsLocation * @return string */ private function getCacheKeyFromCertLocation($certsLocation) { $key = $certsLocation === self::FEDERATED_SIGNON_CERT_URL ? 'federated_signon_certs_v3' : \sha1($certsLocation); return 'google_auth_certs_cache\|' . $key; } }

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