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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 U2FAuthentication\Fido2\AuthenticatorData; |
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use U2FAuthentication\Fido2\CertificateChainChecker; |
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final class PackedAttestationStatementSupport implements AttestationStatementSupport |
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{ |
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public function name(): string |
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{ |
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return 'packed'; |
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} |
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public function isValid(string $clientDataJSONHash, AttestationStatement $attestationStatement, AuthenticatorData $authenticatorData): bool |
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{ |
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Assertion::true($attestationStatement->has('sig'), 'The attestation statement value "sig" is missing.'); |
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switch (true) { |
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case $attestationStatement->has('x5c'): |
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return $this->processWithCertificate($clientDataJSONHash, $attestationStatement, $authenticatorData); |
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case $attestationStatement->has('ecdaaKeyId'): |
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return $this->processWithECDAA(); |
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default: |
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return $this->processWithSelfAttestation(); |
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} |
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} |
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private function processWithCertificate(string $clientDataJSONHash, AttestationStatement $attestationStatement, AuthenticatorData $authenticatorData): bool |
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{ |
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$certificates = $attestationStatement->get('x5c'); |
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Assertion::isArray($certificates, 'The attestation statement value "x5c" must be a list with at least one certificate.'); |
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//Check certificate CA chain and returns the Attestation Certificate |
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$attestnCert = CertificateChainChecker::check($certificates); |
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$signedData = $authenticatorData->getAuthData().$clientDataJSONHash; |
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$result = openssl_verify($signedData, $attestationStatement->get('sig'), $attestnCert, OPENSSL_ALGO_SHA256); |
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if (1 !== $result) { |
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return false; |
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} |
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$this->checkCertificate($attestnCert, $authenticatorData); |
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return true; |
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} |
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private function checkCertificate(string $attestnCert, AuthenticatorData $authenticatorData): void |
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{ |
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$parsed = openssl_x509_parse($attestnCert); |
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//Check version |
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Assertion::false(!isset($parsed['version']) || 2 !== $parsed['version'], 'Invalid certificate version'); |
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//Check subject field |
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Assertion::false(!isset($parsed['name']) || false === mb_strpos($parsed['name'], '/OU=Authenticator Attestation'), 'Invalid certificate name. The Subject Organization Unit must be "Authenticator Attestation"'); |
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//Check extensions |
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Assertion::false(!isset($parsed['extensions']) || !\is_array($parsed['extensions']), 'Certificate extensions are missing'); |
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//Check certificate is not a CA cert |
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Assertion::false(!isset($parsed['extensions']['basicConstraints']) || 'CA:FALSE' !== $parsed['extensions']['basicConstraints'], 'The Basic Constraints extension must have the CA component set to false'); |
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// id-fido-gen-ce-aaguid OID check |
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Assertion::false(\in_array('1.3.6.1.4.1.45724.1.1.4', $parsed['extensions'], true) && !hash_equals($authenticatorData->getAttestedCredentialData()->getAaguid(), $parsed['extensions']['1.3.6.1.4.1.45724.1.1.4']), 'The value of the "aaguid" does not match with the certificate'); |
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} |
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private function processWithECDAA(): bool |
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{ |
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throw new \RuntimeException('ECDAA not supported'); |
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} |
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private function processWithSelfAttestation(): bool |
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{ |
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throw new \RuntimeException('Self attestation not supported'); |
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} |
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} |
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Spomky-Labs /
u2f-php
