public function __construct(array $options = [], $provider)
{
parent::__construct($options);
if (!empty($options['id_token'])) {
$this->idToken = $options['id_token'];
$keys = $provider->getJwtVerificationKeys();
$idTokenClaims = null;
try {
$tks = explode('.', $this->idToken);
// Check if the id_token contains signature
if (count($tks) == 3 && !empty($tks[2])) {
$idTokenClaims = (array) JWT::decode($this->idToken, $keys, ['RS256']);
} else {
// The id_token is unsigned (coming from v1.0 endpoint) - https://msdn.microsoft.com/en-us/library/azure/dn645542.aspx
// Validate the access_token signature first by parsing it as JWT into claims
$accessTokenClaims = (array) JWT::decode($options['access_token'], $keys, ['RS256']);
// Then parse the idToken claims only without validating the signature
$idTokenClaims = (array) JWT::jsonDecode(JWT::urlsafeB64Decode($tks[1]));
}
} catch (JWT_Exception $e) {
throw new RuntimeException("Unable to parse the id_token!");
}
if ($provider->getClientId() != $idTokenClaims['aud']) {
throw new RuntimeException("The audience is invalid!");
}
if ($idTokenClaims['nbf'] > time() || $idTokenClaims['exp'] < time()) {
// Additional validation is being performed in firebase/JWT itself
throw new RuntimeException("The id_token is invalid!");
}
if ($provider->tenant == "common") {
$provider->tenant = $idTokenClaims['tid'];
$tenant = $provider->getTenantDetails($provider->tenant);
if ($idTokenClaims['iss'] != $tenant['issuer']) {
throw new RuntimeException("Invalid token issuer!");
}
} else {
$tenant = $provider->getTenantDetails($provider->tenant);
if ($idTokenClaims['iss'] != $tenant['issuer']) {
throw new RuntimeException("Invalid token issuer!");
}
}
$this->idTokenClaims = $idTokenClaims;
}
}
/**
* Decodes a JWT string into a PHP object.
*
* @param string $jwt The JWT
* @param string|array|null $key The key, or map of keys.
* If the algorithm used is asymmetric, this is the public key
* @param array $allowed_algs List of supported verification algorithms
* Supported algorithms are 'HS256', 'HS384', 'HS512' and 'RS256'
*
* @return object The JWT's payload as a PHP object
*
* @throws DomainException Algorithm was not provided
* @throws UnexpectedValueException Provided JWT was invalid
* @throws SignatureInvalidException Provided JWT was invalid because the signature verification failed
* @throws BeforeValidException Provided JWT is trying to be used before it's eligible as defined by 'nbf'
* @throws BeforeValidException Provided JWT is trying to be used before it's been created as defined by 'iat'
* @throws ExpiredException Provided JWT has since expired, as defined by the 'exp' claim
*
* @uses jsonDecode
* @uses urlsafeB64Decode
*/
public static function decode($jwt, $key, $allowed_algs = array())
{
if (empty($key)) {
throw new InvalidArgumentException('Key may not be empty');
}
$tks = explode('.', $jwt);
if (count($tks) != 3) {
throw new UnexpectedValueException('Wrong number of segments');
}
list($headb64, $bodyb64, $cryptob64) = $tks;
if (null === ($header = JWT::jsonDecode(JWT::urlsafeB64Decode($headb64)))) {
throw new UnexpectedValueException('Invalid header encoding');
}
if (null === ($payload = JWT::jsonDecode(JWT::urlsafeB64Decode($bodyb64)))) {
throw new UnexpectedValueException('Invalid claims encoding');
}
$sig = JWT::urlsafeB64Decode($cryptob64);
if (empty($header->alg)) {
throw new DomainException('Empty algorithm');
}
if (empty(self::$supported_algs[$header->alg])) {
throw new DomainException('Algorithm not supported');
}
if (!is_array($allowed_algs) || !in_array($header->alg, $allowed_algs)) {
throw new DomainException('Algorithm not allowed');
}
if (is_array($key) || $key instanceof \ArrayAccess) {
if (isset($header->kid)) {
$key = $key[$header->kid];
} else {
throw new DomainException('"kid" empty, unable to lookup correct key');
}
}
// Check the signature
if (!JWT::verify("{$headb64}.{$bodyb64}", $sig, $key, $header->alg)) {
throw new SignatureInvalidException('Signature verification failed');
}
// Check if the nbf if it is defined. This is the time that the
// token can actually be used. If it's not yet that time, abort.
if (isset($payload->nbf) && $payload->nbf > time() + self::$leeway) {
throw new BeforeValidException('Cannot handle token prior to ' . date(DateTime::ISO8601, $payload->nbf));
}
// Check that this token has been created before 'now'. This prevents
// using tokens that have been created for later use (and haven't
// correctly used the nbf claim).
if (isset($payload->iat) && $payload->iat > time() + self::$leeway) {
throw new BeforeValidException('Cannot handle token prior to ' . date(DateTime::ISO8601, $payload->iat));
}
// Check if this token has expired.
if (isset($payload->exp) && time() - self::$leeway >= $payload->exp) {
throw new ExpiredException('Expired token', $payload);
}
return $payload;
}
public function testMalformedJsonThrowsException()
{
$this->setExpectedException('DomainException');
JWT::jsonDecode('this is not valid JSON string');
}
