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<?php |
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declare(strict_types=1); |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2018 Spomky-Labs |
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* |
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* This software may be modified and distributed under the terms |
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* of the MIT license. See the LICENSE file for details. |
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*/ |
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namespace U2FAuthentication\Fido; |
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use Assert\Assertion; |
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use Base64Url\Base64Url; |
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use U2FAuthentication\CertificateToolbox; |
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class RegistrationResponse |
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{ |
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private const SUPPORTED_PROTOCOL_VERSIONS = ['U2F_V2']; |
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private const PUBLIC_KEY_LENGTH = 65; |
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/** |
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* @var ClientData |
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*/ |
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private $clientData; |
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/** |
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* @var RegisteredKey |
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*/ |
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private $registeredKey; |
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/** |
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* @var string |
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*/ |
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private $signature; |
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public function __construct(array $data) |
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{ |
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Assertion::false(array_key_exists('errorCode', $data) && 0 !== $data['errorCode'], 'Invalid response.'); |
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$this->checkVersion($data); |
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$clientData = $this->retrieveClientData($data); |
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Assertion::eq('navigator.id.finishEnrollment', $clientData->getType(), 'Invalid response.'); |
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list($publicKey, $keyHandle, $pemCert, $signature) = $this->extractKeyData($data); |
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$this->clientData = $clientData; |
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$this->registeredKey = new RegisteredKey($data['version'], $keyHandle, $publicKey, $pemCert); |
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$this->signature = $signature; |
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} |
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public function getClientData(): ClientData |
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{ |
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return $this->clientData; |
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} |
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public function getRegisteredKey(): RegisteredKey |
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{ |
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return $this->registeredKey; |
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} |
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public function getSignature(): string |
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{ |
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return $this->signature; |
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} |
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private function retrieveClientData(array $data): ClientData |
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{ |
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if (!array_key_exists('clientData', $data) || !\is_string($data['clientData'])) { |
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throw new \InvalidArgumentException('Invalid response.'); |
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} |
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return new ClientData($data['clientData']); |
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} |
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private function checkVersion(array $data): void |
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{ |
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Assertion::false(!array_key_exists('version', $data) || !\is_string($data['version']), 'Invalid response.'); |
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Assertion::false(!\in_array($data['version'], self::SUPPORTED_PROTOCOL_VERSIONS, true), 'Unsupported protocol version.'); |
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} |
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private function extractKeyData(array $data): array |
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{ |
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Assertion::false(!array_key_exists('registrationData', $data) || !\is_string($data['registrationData']), 'Invalid response.'); |
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$stream = \Safe\fopen('php://memory', 'r+'); |
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$registrationData = Base64Url::decode($data['registrationData']); |
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\Safe\fwrite($stream, $registrationData); |
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\Safe\rewind($stream); |
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$reservedByte = \Safe\fread($stream, 1); |
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try { |
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// 1 byte reserved with value x05 |
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Assertion::eq("\x05", $reservedByte, 'Bad reserved byte.'); |
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$publicKey = \Safe\fread($stream, self::PUBLIC_KEY_LENGTH); // 65 bytes for the public key |
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Assertion::eq(self::PUBLIC_KEY_LENGTH, mb_strlen($publicKey, '8bit'), 'Bad public key length.'); |
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$keyHandleLength = \Safe\fread($stream, 1); // 1 byte for the key handle length |
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Assertion::notEq(0, \ord($keyHandleLength), 'Bad key handle length.'); |
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$keyHandle = \Safe\fread($stream, \ord($keyHandleLength)); // x bytes for the key handle |
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Assertion::eq(mb_strlen($keyHandle, '8bit'), \ord($keyHandleLength), 'Bad key handle.'); |
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$certHeader = \Safe\fread($stream, 4); // 4 bytes for the certificate header |
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Assertion::eq(4, mb_strlen($certHeader, '8bit'), 'Bad certificate header.'); |
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$highOrder = \ord($certHeader[2]) << 8; |
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$lowOrder = \ord($certHeader[3]); |
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$certLength = $highOrder + $lowOrder; |
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$certBody = \Safe\fread($stream, $certLength); // x bytes for the certificate |
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Assertion::eq(mb_strlen($certBody, '8bit'), $certLength, 'Bad certificate.'); |
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} catch (\Throwable $throwable) { |
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\Safe\fclose($stream); |
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throw $throwable; |
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} |
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$pemCert = CertificateToolbox::convertDERToPEM($certHeader.$certBody); |
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$signature = ''; // The rest is the signature |
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while (!feof($stream)) { |
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$signature .= \Safe\fread($stream, 1024); |
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} |
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\Safe\fclose($stream); |
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return [ |
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new PublicKey($publicKey), |
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new KeyHandler($keyHandle), |
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$pemCert, |
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$signature, |
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]; |
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} |
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public function isValid(RegistrationRequest $challenge): bool |
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{ |
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if (!hash_equals($challenge->getChallenge(), $this->clientData->getChallenge())) { |
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return false; |
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} |
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if (!hash_equals($challenge->getApplicationId(), $this->clientData->getOrigin())) { |
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return false; |
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} |
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$dataToVerify = "\0"; |
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$dataToVerify .= hash('sha256', $this->clientData->getOrigin(), true); |
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$dataToVerify .= hash('sha256', $this->clientData->getRawData(), true); |
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$dataToVerify .= $this->registeredKey->getKeyHandler(); |
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$dataToVerify .= $this->registeredKey->getPublicKey(); |
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return 1 === openssl_verify($dataToVerify, $this->signature, $this->registeredKey->getAttestationCertificate(), OPENSSL_ALGO_SHA256); |
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} |
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} |
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Spomky-Labs /
u2f-php
