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<?php
/*
* Copyright 2008 Google Inc.
*
* 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\AccessToken;
use DateTime;
use DomainException;
use Exception;
use ExpiredException;
use Firebase\JWT\ExpiredException as ExpiredExceptionV3;
use Firebase\JWT\JWT;
use Firebase\JWT\Key;
use Firebase\JWT\SignatureInvalidException;
use Google\Auth\Cache\MemoryCacheItemPool;
use Google\Exception as GoogleException;
use GuzzleHttp\Client;
use GuzzleHttp\ClientInterface;
use InvalidArgumentException;
use LogicException;
use phpseclib3\Crypt\AES;
use phpseclib3\Crypt\PublicKeyLoader;
use phpseclib3\Math\BigInteger;
use Psr\Cache\CacheItemPoolInterface;
/**
* Wrapper around Google Access Tokens which provides convenience functions
*
*/
class Verify
{
const FEDERATED_SIGNON_CERT_URL = 'https://www.googleapis.com/oauth2/v3/certs';
const OAUTH2_ISSUER = 'accounts.google.com';
const OAUTH2_ISSUER_HTTPS = 'https://accounts.google.com';
/**
* @var ClientInterface The http client
*/
private $http;
/**
* @var CacheItemPoolInterface cache class
*/
private $cache;
/**
* @var \Firebase\JWT\JWT
*/
public $jwt;
/**
* Instantiates the class, but does not initiate the login flow, leaving it
* to the discretion of the caller.
*/
public function __construct(
ClientInterface $http = null,
CacheItemPoolInterface $cache = null,
$jwt = null
) {
if (null === $http) {
$http = new Client();
}
if (null === $cache) {
$cache = new MemoryCacheItemPool();
}
$this->http = $http;
$this->cache = $cache;
$this->jwt = $jwt ?: $this->getJwtService();
}
/**
* 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 $idToken the ID token in JWT format
* @param string $audience Optional. The audience to verify against JWt "aud"
* @return array|false the token payload, if successful
*/
public function verifyIdToken($idToken, $audience = null)
{
if (empty($idToken)) {
throw new LogicException('id_token cannot be null');
}
// set phpseclib constants if applicable
$this->setPhpsecConstants();
// Check signature
$certs = $this->getFederatedSignOnCerts();
foreach ($certs as $cert) {
try {
$args = [$idToken];
$publicKey = $this->getPublicKey($cert);
if (class_exists(Key::class)) {
$args[] = new Key($publicKey, 'RS256');
} else {
$args[] = $publicKey;
$args[] = ['RS256'];
}
$payload = \call_user_func_array([$this->jwt, 'decode'], $args);
if (property_exists($payload, 'aud')) {
if ($audience && $payload->aud != $audience) {
return false;
}
}
// support HTTP and HTTPS issuers
// @see https://developers.google.com/identity/sign-in/web/backend-auth
$issuers = [self::OAUTH2_ISSUER, self::OAUTH2_ISSUER_HTTPS];
if (!isset($payload->iss) || !in_array($payload->iss, $issuers)) {
return false;
}
return (array) $payload;
} catch (ExpiredException $e) { // @phpstan-ignore-line
return false;
} catch (ExpiredExceptionV3 $e) {
return false;
} catch (SignatureInvalidException $e) {
// continue
} catch (DomainException $e) {
// continue
}
}
return false;
}
private function getCache()
{
return $this->cache;
}
/**
* Retrieve and cache a certificates file.
*
* @param string $url location
* @throws \Google\Exception
* @return array certificates
*/
private function retrieveCertsFromLocation($url)
{
// If we're retrieving a local file, just grab it.
if (0 !== strpos($url, 'http')) {
if (!$file = file_get_contents($url)) {
throw new GoogleException(
"Failed to retrieve verification certificates: '" .
$url . "'."
);
}
return json_decode($file, true);
}
// @phpstan-ignore-next-line
$response = $this->http->get($url);
if ($response->getStatusCode() == 200) {
return json_decode((string) $response->getBody(), true);
}
throw new GoogleException(
sprintf(
'Failed to retrieve verification certificates: "%s".',
$response->getBody()->getContents()
),
$response->getStatusCode()
);
}
// 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.
private function getFederatedSignOnCerts()
{
$certs = null;
if ($cache = $this->getCache()) {
$cacheItem = $cache->getItem('federated_signon_certs_v3');
$certs = $cacheItem->get();
}
if (!$certs) {
$certs = $this->retrieveCertsFromLocation(
self::FEDERATED_SIGNON_CERT_URL
);
if ($cache) {
$cacheItem->expiresAt(new DateTime('+1 hour'));
$cacheItem->set($certs);
$cache->save($cacheItem);
}
}
if (!isset($certs['keys'])) {
throw new InvalidArgumentException(
'federated sign-on certs expects "keys" to be set'
);
}
return $certs['keys'];
}
private function getJwtService()
{
$jwt = new JWT();
if ($jwt::$leeway < 1) {
// Ensures JWT leeway is at least 1
// @see https://github.com/google/google-api-php-client/issues/827
$jwt::$leeway = 1;
}
return $jwt;
}
private function getPublicKey($cert)
{
$modulus = new BigInteger($this->jwt->urlsafeB64Decode($cert['n']), 256);
$exponent = new BigInteger($this->jwt->urlsafeB64Decode($cert['e']), 256);
$component = ['n' => $modulus, 'e' => $exponent];
$loader = PublicKeyLoader::load($component);
return $loader->toString('PKCS8');
}
/**
* 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
*/
private function setPhpsecConstants()
{
if (filter_var(getenv('GAE_VM'), FILTER_VALIDATE_BOOLEAN)) {
if (!defined('MATH_BIGINTEGER_OPENSSL_ENABLED')) {
define('MATH_BIGINTEGER_OPENSSL_ENABLED', true);
}
if (!defined('CRYPT_RSA_MODE')) {
define('CRYPT_RSA_MODE', AES::ENGINE_OPENSSL);
}
}
}
}
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