class wfJWT { private $claims; const JWT_TTL = 600; const ISSUER = 600; public static function extractTokenContents($token) { if (!is_string($token)) { throw new InvalidArgumentException('Token is not a string. ' . gettype($token) . ' given.'); } // Verify the token matches the JWT format. if (!preg_match('/^[a-zA-Z0-9\-_]+?\.[a-zA-Z0-9\-_]+?\.[a-zA-Z0-9\-_]+?$/', $token)) { throw new wfJWTException('Invalid token format.'); } list($header, $body, $signature) = explode('.', $token); // Test that the token is valid and not expired. $decodedHeader = base64_decode($header); if (!(is_string($decodedHeader) && $decodedHeader)) { throw new wfJWTException('Token header is invalid.'); } $header = json_decode($decodedHeader, true); if (!is_array($header)) { throw new wfJWTException('Token header is invalid.'); } $decodedBody = base64_decode($body); if (!(is_string($decodedBody) && $decodedBody)) { throw new wfJWTException('Token body is invalid.'); } $body = json_decode($decodedBody, true); if (!is_array($body)) { throw new wfJWTException('Token body is invalid.'); } return array( 'header' => $header, 'body' => $body, 'signature' => $signature, ); } /** * @param mixed $subject */ public function __construct($subject = null) { $this->claims = $this->getClaimDefaults(); $this->claims['sub'] = $subject; } /** * @return string */ public function encode() { $header = $this->encodeString($this->buildHeader()); $body = $this->encodeString($this->buildBody()); return sprintf('%s.%s.%s', $header, $body, $this->encodeString($this->sign(sprintf('%s.%s', $header, $body)))); } /** * @param string $token * @return array * @throws wfJWTException|InvalidArgumentException */ public function decode($token) { if (!is_string($token)) { throw new InvalidArgumentException('Token is not a string. ' . gettype($token) . ' given.'); } // Verify the token matches the JWT format. if (!preg_match('/^[a-zA-Z0-9\-_]+?\.[a-zA-Z0-9\-_]+?\.[a-zA-Z0-9\-_]+?$/', $token)) { throw new wfJWTException('Invalid token format.'); } list($header, $body, $signature) = explode('.', $token); // Verify signature matches the supplied payload. if (!$this->verifySignature($this->decodeString($signature), sprintf('%s.%s', $header, $body))) { throw new wfJWTException('Invalid signature.'); } // Test that the token is valid and not expired. $decodedHeader = base64_decode($header); if (!(is_string($decodedHeader) && $decodedHeader)) { throw new wfJWTException('Token header is invalid.'); } $header = json_decode($decodedHeader, true); if (!( is_array($header) && array_key_exists('alg', $header) && $header['alg'] === 'HS256' && $header['typ'] === 'JWT' )) { throw new wfJWTException('Token header is invalid.'); } $decodedBody = base64_decode($body); if (!(is_string($decodedBody) && $decodedBody)) { throw new wfJWTException('Token body is invalid.'); } $body = json_decode($decodedBody, true); if (!( is_array($body) && // Check the token not before now timestamp. array_key_exists('nbf', $body) && is_numeric($body['nbf']) && $body['nbf'] <= time() && // Check the token is not expired. array_key_exists('exp', $body) && is_numeric($body['exp']) && $body['exp'] >= time() && // Check the issuer and audience is ours. $body['iss'] === 'Wordfence ' . WORDFENCE_VERSION && $body['aud'] === 'Wordfence Central' )) { throw new wfJWTException('Token is invalid or expired.'); } return array( 'header' => $header, 'body' => $body, ); } /** * @param string $string * @return string */ public function sign($string) { $salt = wp_salt('auth'); return hash_hmac('sha256', $string, $salt, true); } /** * @param string $signature * @param string $message * @return bool */ public function verifySignature($signature, $message) { return hash_equals($this->sign($message), $signature); } /** * @return string */ public function __toString() { return $this->encode(); } /** * @param string $data * @return string */ public function encodeString($data) { return rtrim(strtr(base64_encode($data), '+/', '-_'), '='); } /** * @param string $data * @return bool|string */ public function decodeString($data) { return base64_decode(strtr($data, '-_', '+/')); } /** * @return mixed|string */ protected function buildHeader() { return '{"alg":"HS256","typ":"JWT"}'; } /** * @return mixed|string */ protected function buildBody() { return json_encode($this->getClaims()); } /** * @return array */ protected function getClaimDefaults() { $now = time(); return array( 'iss' => 'Wordfence ' . WORDFENCE_VERSION, 'aud' => 'Wordfence Central', 'nbf' => $now, 'iat' => $now, 'exp' => $now + self::JWT_TTL, ); } /** * @param array $claims */ public function addClaims($claims) { if (!is_array($claims)) { throw new InvalidArgumentException(__METHOD__ . ' expects argument 1 to be array.'); } $this->setClaims(array_merge($this->getClaims(), $claims)); } /** * @return array */ public function getClaims() { return $this->claims; } /** * @param array $claims */ public function setClaims($claims) { $this->claims = $claims; } } class wfJWTException extends Exception { } Survival | Right Tactics
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