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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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final class PackedAttestationStatementSupport 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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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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Assertion::notEmpty($certificates, 'The attestation statement value "x5c" must be a list with at least one certificate.'); |
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//Check certificate CA chain and returns the Attestation Certificate |
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$attestnCert = $this->loadFromX5C($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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private function getX509Certificate(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 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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private function loadFromX5C(array $x5c): string |
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{ |
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$certificate = null; |
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$last_issuer = null; |
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$last_subject = null; |
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foreach ($x5c as $cert) { |
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$current_cert = $this->getX509Certificate($cert); |
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$x509 = \Safe\openssl_x509_read($current_cert); |
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if (false === $x509) { |
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$last_issuer = null; |
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$last_subject = null; |
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break; |
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} |
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$parsed = \openssl_x509_parse($x509); |
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\openssl_x509_free($x509); |
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if (false === $parsed) { |
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$last_issuer = null; |
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$last_subject = null; |
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break; |
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} |
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if (null === $last_subject) { |
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$last_subject = $parsed['subject']; |
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$last_issuer = $parsed['issuer']; |
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$certificate = $current_cert; |
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} else { |
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if (\Safe\json_encode($last_issuer) === \Safe\json_encode($parsed['subject'])) { |
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$last_subject = $parsed['subject']; |
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$last_issuer = $parsed['issuer']; |
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} else { |
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$last_issuer = null; |
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$last_subject = null; |
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break; |
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} |
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} |
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} |
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switch (true) { |
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case null !== $certificate && 1 === \count($x5c): |
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return $certificate; |
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case null === $certificate: |
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case \Safe\json_encode($last_issuer) !== \Safe\json_encode($last_subject): |
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throw new \InvalidArgumentException('Invalid certificate chain.'); |
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default: |
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return $certificate; |
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} |
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} |
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} |
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Spomky-Labs /
u2f-php
