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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\AttestationStatement; |
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use Assert\Assertion; |
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use CBOR\Decoder; |
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use CBOR\MapObject; |
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use CBOR\StringStream; |
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use U2FAuthentication\Fido2\AuthenticatorData; |
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final class FidoU2FAttestationStatementSupport implements AttestationStatementSupport |
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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 $decoder; |
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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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public function name(): string |
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{ |
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return 'fido-u2f'; |
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} |
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public function isValid(string $clientDataJSONHash, AttestationStatement $attestationStatement, AuthenticatorData $authenticatorData): bool |
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{ |
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foreach (['sig', 'x5c'] as $key) { |
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Assertion::true($attestationStatement->has($key), \Safe\sprintf('The attestation statement value "%s" is missing.', $key)); |
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} |
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$certificates = $attestationStatement->get('x5c'); |
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Assertion::isArray($certificates, 'The attestation statement value "x5c" must be a list with one certificate.'); |
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Assertion::count($certificates, 1, 'The attestation statement value "x5c" must be a list with one certificate.'); |
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reset($certificates); |
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$certificate = $this->getCertificateAsPem(current($certificates)); |
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$dataToVerify = "\0"; |
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$dataToVerify .= $authenticatorData->getRpIdHash(); |
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$dataToVerify .= $clientDataJSONHash; |
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$dataToVerify .= $authenticatorData->getAttestedCredentialData()->getCredentialId(); |
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$dataToVerify .= $this->extractPublicKey($authenticatorData->getAttestedCredentialData()->getCredentialPublicKey()); |
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return 1 === openssl_verify($dataToVerify, $attestationStatement->get('sig'), $certificate, OPENSSL_ALGO_SHA256); |
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} |
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private function getCertificateAsPem(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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private function extractPublicKey(?string $publicKey): string |
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{ |
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Assertion::notNull($publicKey, 'The attestated credential data does not contain a valid public key.'); |
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$publicKey = $this->decoder->decode(new StringStream($publicKey)); |
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Assertion::isInstanceOf($publicKey, MapObject::class, 'The attestated credential data does not contain a valid public key.'); |
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$publicKey = $publicKey->getNormalizedData(); |
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Assertion::false(!array_key_exists(-2, $publicKey) || !\is_string($publicKey[-2]) || 32 !== mb_strlen($publicKey[-2], '8bit'), 'The public key of the attestation statement is not valid.'); |
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Assertion::false(!array_key_exists(-3, $publicKey) || !\is_string($publicKey[-3]) || 32 !== mb_strlen($publicKey[-3], '8bit'), 'The public key of the attestation statement is not valid.'); |
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return "\x04".$publicKey[-2].$publicKey[-3]; |
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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, true)) { |
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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
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