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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) 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 Base64Url\Base64Url; |
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use CBOR\Decoder; |
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class AuthenticatorAttestationResponseChecker |
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{ |
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private const CERTIFICATES_HASHES = [ |
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'349bca1031f8c82c4ceca38b9cebf1a69df9fb3b94eed99eb3fb9aa3822d26e8', |
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'dd574527df608e47ae45fbba75a2afdd5c20fd94a02419381813cd55a2a3398f', |
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'1d8764f0f7cd1352df6150045c8f638e517270e8b5dda1c63ade9c2280240cae', |
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'd0edc9a91a1677435a953390865d208c55b3183c6759c9b5a7ff494c322558eb', |
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'6073c436dcd064a48127ddbf6032ac1a66fd59a0c24434f070d4e564c124c897', |
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'ca993121846c464d666096d35f13bf44c1b05af205f9b4a1e00cf6cc10c5e511', |
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]; |
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private const FLAG_AT = 0b01000000; |
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private const FLAG_ED = 0b10000000; |
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/** |
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* @var Decoder |
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*/ |
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private $decoder; |
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/** |
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* AttestationObjectParser constructor. |
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* |
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* @param Decoder $decoder |
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*/ |
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public function __construct(Decoder $decoder) |
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{ |
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$this->decoder = $decoder; |
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} |
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/** |
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* @param PublicKeyCredentialCreationOptions $publicKeyCredentialCreationOptions |
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* @param AuthenticatorAttestationResponse $authenticatorAttestationResponse |
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*/ |
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public function check(PublicKeyCredentialCreationOptions $publicKeyCredentialCreationOptions, AuthenticatorAttestationResponse $authenticatorAttestationResponse) |
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{ |
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$this->checkClientData($publicKeyCredentialCreationOptions, $authenticatorAttestationResponse->getClientDataJSON()); |
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} |
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private function checkClientData(PublicKeyCredentialCreationOptions $publicKeyCredentialCreationOptions, string $clientData): void |
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{ |
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$decoded = Base64Url::decode($clientData); |
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$json = json_decode($decoded, true); |
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if (!hash_equals($publicKeyCredentialCreationOptions->getChallenge(), Base64Url::decode($json['challenge']))) { |
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throw new \InvalidArgumentException(); |
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} |
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if ($publicKeyCredentialCreationOptions->getRp()->getId()) { |
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} |
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} |
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/** |
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* @param string $attestationObject |
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* |
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* @return AuthenticatorData |
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*/ |
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public function loadAttestationObject(string $attestationObject): AuthenticatorData |
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{ |
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$decodedAttestationObject = Base64Url::decode($attestationObject); |
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$stream = new StringStream($decodedAttestationObject); |
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$data = $this->decoder->decode($stream); |
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dump($data); |
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$normalized = $data->getNormalizedData(); |
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foreach ($normalized['attStmt']['x5c'] as $cert) { |
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dump($this->getPublicKeyAsPem($cert)); |
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} |
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dump(base64_encode($normalized['attStmt']['sig'])); |
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$authDataStream = new StringStream($normalized['authData']); |
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$rp_id_hash = $authDataStream->read(32); |
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$flags = $authDataStream->read(1); |
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$signCount = $authDataStream->read(4); |
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$signCount = unpack('l', $signCount)[1]; |
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if (ord($flags) & self::FLAG_AT) { |
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$aaguid = $authDataStream->read(16); |
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$credentialLength = $authDataStream->read(2); |
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$credentialLength = unpack('n', $credentialLength)[1]; |
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$credentialId = $authDataStream->read($credentialLength); |
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$credentialPublicKey = $this->decoder->decode($authDataStream); |
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//TODO: should be converted into a COSE Key |
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$attestedCredentialData = new AttestedCredentialData($aaguid, $credentialId, $credentialPublicKey); |
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} else { |
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$attestedCredentialData = null; |
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} |
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if (ord($flags) & self::FLAG_ED) { |
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$extension = $this->decoder->decode($authDataStream); |
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//TODO: should be correctly handled |
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} else { |
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$extension = null; |
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} |
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$authenticatorData = new AuthenticatorData( |
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$rp_id_hash, |
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$flags, |
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$signCount, |
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$attestedCredentialData, |
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$extension |
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); |
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return $authenticatorData; |
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} |
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/** |
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* @param string $publicKey |
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* |
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* @return string |
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*/ |
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private function getPublicKeyAsPem(string $publicKey): string |
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{ |
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$derCertificate = $this->unusedBytesFix($publicKey); |
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$pemCert = '-----BEGIN CERTIFICATE-----'.PHP_EOL; |
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$pemCert .= chunk_split(base64_encode($derCertificate), 64, PHP_EOL); |
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$pemCert .= '-----END CERTIFICATE-----'.PHP_EOL; |
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return $pemCert; |
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} |
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/** |
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* @param string $derCertificate |
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* |
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* @return string |
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*/ |
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private function unusedBytesFix(string $derCertificate): string |
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{ |
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$certificateHash = hash('sha256', $derCertificate); |
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if (in_array($certificateHash, self::CERTIFICATES_HASHES)) { |
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$derCertificate[mb_strlen($derCertificate, '8bit') - 257] = "\0"; |
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} |
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return $derCertificate; |
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} |
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} |
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Spomky-Labs /
u2f-php
