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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\Fido2; |
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class AuthenticatorAssertionResponseValidator |
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{ |
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private $credentialRepository; |
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public function __construct(CredentialRepository $credentialRepository) |
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{ |
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$this->credentialRepository = $credentialRepository; |
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} |
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/** |
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* @see https://www.w3.org/TR/webauthn/#registering-a-new-credential |
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*/ |
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public function check(string $credentialId, AuthenticatorAssertionResponse $authenticatorAssertionResponse, PublicKeyCredentialRequestOptions $publicKeyCredentialRequestOptions, ?string $rpId = null): void |
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{ |
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/* @see 7.2.1 */ |
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if (!$this->isCredentialIdAllowed($credentialId, $publicKeyCredentialRequestOptions->getAllowCredentials())) { |
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throw new \InvalidArgumentException('The credential ID is not allowed.'); |
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} |
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/* @see 7.2.2 */ |
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if (null !== $authenticatorAssertionResponse->getUserHandle()) { |
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throw new \RuntimeException('Not supported.'); //TODO: implementation shall be done. |
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} |
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/* @see 7.2.3 */ |
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if (!$this->credentialRepository->hasCredentialPublicKey($credentialId)) { |
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throw new \InvalidArgumentException('No credential public key available for the given credential ID.'); |
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} |
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$credentialPublicKey = $this->credentialRepository->getCredentialPublicKey($credentialId); |
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/** @see 7.2.4 */ |
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/** @see 7.2.5 */ |
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//Nothirg to do. Use of objets directly |
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/** @see 7.2.6 */ |
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$C = $authenticatorAssertionResponse->getClientDataJSON(); |
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/* @see 7.2.7 */ |
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if ('webauthn.get' !== $C->getType()) { |
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throw new \InvalidArgumentException('The client data type is not "webauthn.get".'); |
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} |
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/* @see 7.2.8 */ |
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if (hash_equals($publicKeyCredentialRequestOptions->getChallenge(), $C->getChallenge())) { |
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throw new \InvalidArgumentException('Invalid challenge.'); |
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} |
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/** @see 7.2.9 */ |
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$rpId = $rpId ?? $publicKeyCredentialRequestOptions->getRpId(); |
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if (null === $rpId) { |
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throw new \InvalidArgumentException('No rpId.'); |
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} |
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$parsedRelyingPartyId = parse_url($C->getOrigin()); |
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if (!array_key_exists('host', $parsedRelyingPartyId) || !\is_string($parsedRelyingPartyId['host'])) { |
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throw new \InvalidArgumentException('Invalid origin rpId.'); |
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} |
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if ($parsedRelyingPartyId['host'] !== $rpId) { |
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throw new \InvalidArgumentException('rpId mismatch.'); |
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} |
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/* @see 7.2.10 */ |
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if ($C->getTokenBinding()) { |
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throw new \InvalidArgumentException('Token binding not supported.'); |
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} |
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/** @see 7.2.11 */ |
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$rpIdHash = hash('sha256', $rpId); |
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if (hash_equals($rpIdHash, $authenticatorAssertionResponse->getAuthenticatorData()->getRpIdHash())) { |
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throw new \InvalidArgumentException('rpId hash mismatch.'); |
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} |
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/* @see 7.2.12 */ |
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if (!$authenticatorAssertionResponse->getAuthenticatorData()->isUserPresent()) { |
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throw new \InvalidArgumentException('User was not present'); |
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} |
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/* @see 7.2.13 */ |
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if (AuthenticatorSelectionCriteria::USER_VERIFICATION_REQUIREMENT_REQUIRED === $publicKeyCredentialRequestOptions->getUserVerification() && !$authenticatorAssertionResponse->getAuthenticatorData()->isUserVerified()) { |
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throw new \InvalidArgumentException('User authentication required.'); |
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} |
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/* @see 7.2.14 */ |
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if (0 !== $publicKeyCredentialRequestOptions->getExtensions()->count()) { |
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throw new \InvalidArgumentException('Extensions not supported.'); |
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} |
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/** @see 7.2.15 */ |
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$getClientDataJSONHash = hash('sha256', $authenticatorAssertionResponse->getClientDataJSON()->getRawData()); |
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/* @see 7.2.16 */ |
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//TODO: check signature |
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/* @see 7.2.17 */ |
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//TODO: check counter |
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/* @see 7.2.18 */ |
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//Great! |
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} |
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private function isCredentialIdAllowed(string $credentialId, array $allowedCredentials): bool |
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{ |
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foreach ($allowedCredentials as $allowedCredential) { |
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if (hash_equals($allowedCredential->getId(), $credentialId)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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} |
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Spomky-Labs /
u2f-php
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