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<?php declare(strict_types=1); namespace Webauthn\AttestationStatement; use function array_key_exists; use function count; use function is_array; use function is_int; use function is_string; use Jose\Component\Core\Algorithm as AlgorithmInterface; use Jose\Component\Core\AlgorithmManager; use Jose\Component\KeyManagement\JWKFactory; use Jose\Component\Signature\Algorithm\EdDSA; use Jose\Component\Signature\Algorithm\ES256; use Jose\Component\Signature\Algorithm\ES384; use Jose\Component\Signature\Algorithm\ES512; use Jose\Component\Signature\Algorithm\PS256; use Jose\Component\Signature\Algorithm\PS384; use Jose\Component\Signature\Algorithm\PS512; use Jose\Component\Signature\Algorithm\RS256; use Jose\Component\Signature\Algorithm\RS384; use Jose\Component\Signature\Algorithm\RS512; use Jose\Component\Signature\JWS; use Jose\Component\Signature\JWSVerifier; use Jose\Component\Signature\Serializer\CompactSerializer; use const JSON_THROW_ON_ERROR; use Psr\EventDispatcher\EventDispatcherInterface; use Psr\Http\Client\ClientInterface; use Psr\Http\Message\RequestFactoryInterface; use Psr\Http\Message\ResponseInterface; use Webauthn\AuthenticatorData; use Webauthn\Event\AttestationStatementLoaded; use Webauthn\Exception\AttestationStatementLoadingException; use Webauthn\Exception\AttestationStatementVerificationException; use Webauthn\Exception\InvalidAttestationStatementException; use Webauthn\Exception\UnsupportedFeatureException; use Webauthn\MetadataService\CertificateChain\CertificateToolbox; use Webauthn\MetadataService\Event\CanDispatchEvents; use Webauthn\MetadataService\Event\NullEventDispatcher; use Webauthn\TrustPath\CertificateTrustPath; final class AndroidSafetyNetAttestationStatementSupport implements AttestationStatementSupport, CanDispatchEvents { private ?string $apiKey = null; private ?ClientInterface $client = null; private readonly CompactSerializer $jwsSerializer; private ?JWSVerifier $jwsVerifier = null; private ?RequestFactoryInterface $requestFactory = null; private int $leeway = 0; private int $maxAge = 60000; private EventDispatcherInterface $dispatcher; public function __construct() { if (! class_exists(RS256::class)) { throw UnsupportedFeatureException::create( 'The algorithm RS256 is missing. Did you forget to install the package web-token/jwt-signature-algorithm-rsa?' ); } if (! class_exists(JWKFactory::class)) { throw UnsupportedFeatureException::create( 'The class Jose\Component\KeyManagement\JWKFactory is missing. Did you forget to install the package web-token/jwt-key-mgmt?' ); } $this->jwsSerializer = new CompactSerializer(); $this->initJwsVerifier(); $this->dispatcher = new NullEventDispatcher(); } public function setEventDispatcher(EventDispatcherInterface $eventDispatcher): void { $this->dispatcher = $eventDispatcher; } public static function create(): self { return new self(); } public function enableApiVerification( ClientInterface $client, string $apiKey, RequestFactoryInterface $requestFactory ): self { $this->apiKey = $apiKey; $this->client = $client; $this->requestFactory = $requestFactory; return $this; } public function setMaxAge(int $maxAge): self { $this->maxAge = $maxAge; return $this; } public function setLeeway(int $leeway): self { $this->leeway = $leeway; return $this; } public function name(): string { return 'android-safetynet'; } /** * @param array<string, mixed> $attestation / public function load(array $attestation): AttestationStatement { array_key_exists('attStmt', $attestation) \|\| throw AttestationStatementLoadingException::create( $attestation, 'Invalid attestation object' ); foreach (['ver', 'response'] as $key) { array_key_exists($key, $attestation['attStmt']) \|\| throw AttestationStatementLoadingException::create( $attestation, sprintf('The attestation statement value "%s" is missing.', $key) ); $attestation['attStmt'][$key] !== '' \|\| throw AttestationStatementLoadingException::create( $attestation, sprintf('The attestation statement value "%s" is empty.', $key) ); } $jws = $this->jwsSerializer->unserialize($attestation['attStmt']['response']); $jwsHeader = $jws->getSignature(0) ->getProtectedHeader(); array_key_exists('x5c', $jwsHeader) \|\| throw AttestationStatementLoadingException::create( $attestation, 'The response in the attestation statement must contain a "x5c" header.' ); (is_countable($jwsHeader['x5c']) ? count( $jwsHeader['x5c'] ) : 0) > 0 \|\| throw AttestationStatementLoadingException::create( $attestation, 'The "x5c" parameter in the attestation statement response must contain at least one certificate.' ); $certificates = $this->convertCertificatesToPem($jwsHeader['x5c']); $attestation['attStmt']['jws'] = $jws; $attestationStatement = AttestationStatement::createBasic( $this->name(), $attestation['attStmt'], new CertificateTrustPath($certificates) ); $this->dispatcher->dispatch(AttestationStatementLoaded::create($attestationStatement)); return $attestationStatement; } public function isValid( string $clientDataJSONHash, AttestationStatement $attestationStatement, AuthenticatorData $authenticatorData ): bool { $trustPath = $attestationStatement->getTrustPath(); $trustPath instanceof CertificateTrustPath \|\| throw InvalidAttestationStatementException::create( $attestationStatement, 'Invalid trust path' ); $certificates = $trustPath->getCertificates(); $firstCertificate = current($certificates); is_string($firstCertificate) \|\| throw InvalidAttestationStatementException::create( $attestationStatement, 'No certificate' ); $parsedCertificate = openssl_x509_parse($firstCertificate); is_array($parsedCertificate) \|\| throw InvalidAttestationStatementException::create( $attestationStatement, 'Invalid attestation object' ); array_key_exists('subject', $parsedCertificate) \|\| throw InvalidAttestationStatementException::create( $attestationStatement, 'Invalid attestation object' ); array_key_exists('CN', $parsedCertificate['subject']) \|\| throw InvalidAttestationStatementException::create( $attestationStatement, 'Invalid attestation object' ); $parsedCertificate['subject']['CN'] === 'attest.android.com' \|\| throw InvalidAttestationStatementException::create( $attestationStatement, 'Invalid attestation object' ); /* @var JWS $jws / $jws = $attestationStatement->get('jws'); $payload = $jws->getPayload(); $this->validatePayload($payload, $clientDataJSONHash, $authenticatorData); //Check the signature $this->validateSignature($jws, $trustPath); //Check against Google service $this->validateUsingGoogleApi($attestationStatement); return true; } private function validatePayload( ?string $payload, string $clientDataJSONHash, AuthenticatorData $authenticatorData ): void { $payload !== null \|\| throw AttestationStatementVerificationException::create('Invalid attestation object'); $payload = json_decode($payload, true, 512, JSON_THROW_ON_ERROR); array_key_exists('nonce', $payload) \|\| throw AttestationStatementVerificationException::create( 'Invalid attestation object. "nonce" is missing.' ); $payload['nonce'] === base64_encode( hash('sha256', $authenticatorData->getAuthData() . $clientDataJSONHash, true) ) \|\| throw AttestationStatementVerificationException::create('Invalid attestation object. Invalid nonce'); array_key_exists('ctsProfileMatch', $payload) \|\| throw AttestationStatementVerificationException::create( 'Invalid attestation object. "ctsProfileMatch" is missing.' ); $payload['ctsProfileMatch'] \|\| throw AttestationStatementVerificationException::create( 'Invalid attestation object. "ctsProfileMatch" value is false.' ); array_key_exists('timestampMs', $payload) \|\| throw AttestationStatementVerificationException::create( 'Invalid attestation object. Timestamp is missing.' ); is_int($payload['timestampMs']) \|\| throw AttestationStatementVerificationException::create( 'Invalid attestation object. Timestamp shall be an integer.' ); $currentTime = time() 1000; $payload['timestampMs'] <= $currentTime + $this->leeway \|\| throw AttestationStatementVerificationException::create( sprintf( 'Invalid attestation object. Issued in the future. Current time: %d. Response time: %d', $currentTime, $payload['timestampMs'] ) ); $currentTime - $payload['timestampMs'] <= $this->maxAge \|\| throw AttestationStatementVerificationException::create( sprintf( 'Invalid attestation object. Too old. Current time: %d. Response time: %d', $currentTime, $payload['timestampMs'] ) ); } private function validateSignature(JWS $jws, CertificateTrustPath $trustPath): void { $jwk = JWKFactory::createFromCertificate($trustPath->getCertificates()[0]); $isValid = $this->jwsVerifier?->verifyWithKey($jws, $jwk, 0); $isValid === true \|\| throw AttestationStatementVerificationException::create('Invalid response signature'); } private function validateUsingGoogleApi(AttestationStatement $attestationStatement): void { if ($this->client === null \|\| $this->apiKey === null \|\| $this->requestFactory === null) { return; } $uri = sprintf( 'https://www.googleapis.com/androidcheck/v1/attestations/verify?key=%s', urlencode($this->apiKey) ); $requestBody = sprintf('{"signedAttestation":"%s"}', $attestationStatement->get('response')); $request = $this->requestFactory->createRequest('POST', $uri); $request = $request->withHeader('content-type', 'application/json'); $request->getBody() ->write($requestBody); $response = $this->client->sendRequest($request); $this->checkGoogleApiResponse($response); $responseBody = $this->getResponseBody($response); $responseBodyJson = json_decode($responseBody, true, 512, JSON_THROW_ON_ERROR); array_key_exists( 'isValidSignature', $responseBodyJson ) \|\| throw AttestationStatementVerificationException::create('Invalid response.'); $responseBodyJson['isValidSignature'] === true \|\| throw AttestationStatementVerificationException::create( 'Invalid response.' ); } private function getResponseBody(ResponseInterface $response): string { $responseBody = ''; $response->getBody() ->rewind(); do { $tmp = $response->getBody() ->read(1024); if ($tmp === '') { break; } $responseBody .= $tmp; } while (true); return $responseBody; } private function checkGoogleApiResponse(ResponseInterface $response): void { $response->getStatusCode() === 200 \|\| throw AttestationStatementVerificationException::create( 'Request did not succeeded' ); $response->hasHeader('content-type') \|\| throw AttestationStatementVerificationException::create( 'Unrecognized response' ); foreach ($response->getHeader('content-type') as $header) { if (mb_strpos($header, 'application/json') === 0) { return; } } throw AttestationStatementVerificationException::create('Unrecognized response'); } /** * @param string[] $certificates * * @return string[] / private function convertCertificatesToPem(array $certificates): array { foreach ($certificates as $k => $v) { $certificates[$k] = CertificateToolbox::fixPEMStructure($v); } return $certificates; } private function initJwsVerifier(): void { $algorithmClasses = [ RS256::class, RS384::class, RS512::class, PS256::class, PS384::class, PS512::class, ES256::class, ES384::class, ES512::class, EdDSA::class, ]; /* @var AlgorithmInterface[] $algorithms / $algorithms = []; foreach ($algorithmClasses as $algorithm) { if (class_exists($algorithm)) { /* @var AlgorithmInterface $algorithm */ $algorithms[] = new $algorithm(); } } $algorithmManager = new AlgorithmManager($algorithms); $this->jwsVerifier = new JWSVerifier($algorithmManager); } }

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