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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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use Assert\Assertion; |
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use CBOR\Decoder; |
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use CBOR\StringStream; |
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class AuthenticatorAssertionResponseValidator |
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{ |
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private $credentialRepository; |
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private $decoder; |
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public function __construct(CredentialRepository $credentialRepository, Decoder $decoder) |
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{ |
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$this->credentialRepository = $credentialRepository; |
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$this->decoder = $decoder; |
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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 $rpId = null): void |
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{ |
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/* @see 7.2.1 */ |
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Assertion::true($this->isCredentialIdAllowed($credentialId, $publicKeyCredentialRequestOptions->getAllowCredentials()), 'The credential ID is not allowed.'); |
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/* @see 7.2.2 */ |
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Assertion::null($authenticatorAssertionResponse->getUserHandle(), 'User Handle not supported.'); //TODO: implementation shall be done. |
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/* @see 7.2.3 */ |
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Assertion::true($this->credentialRepository->has($credentialId), 'No credential public key available for the given credential ID.'); |
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$attestedCredentialData = $this->credentialRepository->get($credentialId); |
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$credentialPublicKey = $attestedCredentialData->getCredentialPublicKey(); |
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Assertion::notNull($credentialPublicKey, 'No public key available.'); |
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$credentialPublicKey = $this->decoder->decode( |
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new StringStream($credentialPublicKey) |
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); |
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/** @see 7.2.4 */ |
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/** @see 7.2.5 */ |
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//Nothing 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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Assertion::eq('webauthn.get', $C->getType(), 'The client data type is not "webauthn.get".'); |
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/* @see 7.2.8 */ |
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Assertion::true(hash_equals($publicKeyCredentialRequestOptions->getChallenge(), $C->getChallenge()), 'Invalid challenge.'); |
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/** @see 7.2.9 */ |
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$rpId = $rpId ?? $publicKeyCredentialRequestOptions->getRpId(); |
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Assertion::notNull($rpId, 'No rpId.'); |
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$parsedRelyingPartyId = parse_url($C->getOrigin()); |
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Assertion::true(array_key_exists('host', $parsedRelyingPartyId) && \is_string($parsedRelyingPartyId['host']), 'Invalid origin rpId.'); |
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Assertion::eq($parsedRelyingPartyId['host'], $rpId, 'rpId mismatch.'); |
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/* @see 7.2.10 */ |
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Assertion::null($C->getTokenBinding(), 'Token binding not supported.'); |
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/** @see 7.2.11 */ |
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$rpIdHash = hash('sha256', $rpId, true); |
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Assertion::true(hash_equals($rpIdHash, $authenticatorAssertionResponse->getAuthenticatorData()->getRpIdHash()), 'rpId hash mismatch.'); |
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/* @see 7.2.12 */ |
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Assertion::true($authenticatorAssertionResponse->getAuthenticatorData()->isUserPresent(), 'User was not present'); |
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/* @see 7.2.13 */ |
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Assertion::false(AuthenticatorSelectionCriteria::USER_VERIFICATION_REQUIREMENT_REQUIRED === $publicKeyCredentialRequestOptions->getUserVerification() && !$authenticatorAssertionResponse->getAuthenticatorData()->isUserVerified(), 'User authentication required.'); |
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/* @see 7.2.14 */ |
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Assertion::eq(0, $publicKeyCredentialRequestOptions->getExtensions()->count(), 'Extensions not supported.'); |
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/** @see 7.2.15 */ |
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$getClientDataJSONHash = hash('sha256', $authenticatorAssertionResponse->getClientDataJSON()->getRawData(), true); |
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/* @see 7.2.16 */ |
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$coseKey = $credentialPublicKey->getNormalizedData(); |
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$key = "\04".$coseKey[-2].$coseKey[-3]; |
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Assertion::eq(1, openssl_verify($authenticatorAssertionResponse->getAuthenticatorData()->getAuthData().$getClientDataJSONHash, $authenticatorAssertionResponse->getSignature(), $this->getPublicKeyAsPem($key), OPENSSL_ALGO_SHA256), 'Invalid signature.'); |
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/* @see 7.2.17 */ |
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$storedCounter = $this->credentialRepository->getCounterFor($credentialId); |
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$currentCounter = $authenticatorAssertionResponse->getAuthenticatorData()->getSignCount(); |
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Assertion::greaterThan($currentCounter, $storedCounter, 'Invalid counter.'); |
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$this->credentialRepository->updateCounterFor($credentialId, $currentCounter); |
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/* @see 7.2.18 */ |
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} |
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private function getPublicKeyAsPem(string $key): string |
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{ |
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$der = "\x30\x59\x30\x13\x06\x07\x2a\x86\x48\xce\x3d\x02\x01"; |
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$der .= "\x06\x08\x2a\x86\x48\xce\x3d\x03\x01\x07\x03\x42"; |
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$der .= "\0".$key; |
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$pem = '-----BEGIN PUBLIC KEY-----'.PHP_EOL; |
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$pem .= chunk_split(base64_encode($der), 64, PHP_EOL); |
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$pem .= '-----END PUBLIC KEY-----'.PHP_EOL; |
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return $pem; |
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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
