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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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class CertificateChainChecker |
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{ |
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public static function check(array $x5c): string |
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{ |
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Assertion::notEmpty($x5c, 'The attestation statement value "x5c" must be a list with at least one certificate.'); |
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reset($x5c); |
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$currentCert = self::getX509Certificate(current($x5c)); |
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if (1 === \count($x5c)) { |
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return $currentCert; |
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} |
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$firstCert = $currentCert; |
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$currentCertParsed = openssl_x509_parse($currentCert); |
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$purpose = X509_PURPOSE_ANY; |
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$file = \Safe\tmpfile(); |
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$path = stream_get_meta_data($file)['uri']; |
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while ($nextCert = next($x5c)) { |
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$currentCertIssuer = \Safe\json_encode($currentCertParsed['issuer']); |
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$nextCertAsPem = self::getX509Certificate($nextCert); |
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$nextCertParsed = openssl_x509_parse($nextCertAsPem); |
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$nextCertAsPemSubject = \Safe\json_encode($nextCertParsed['subject']); |
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Assertion::eq($currentCertIssuer, $nextCertAsPemSubject, 'Invalid certificate chain.'); |
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\Safe\rewind($file); |
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\Safe\fwrite($file, $nextCertAsPem); |
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$result = openssl_x509_checkpurpose($currentCert, $purpose, [$path]); |
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Assertion::eq(1, $result, 'Invalid certificate chain.'); |
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Assertion::keyExists($nextCertParsed, 'extensions', 'Invalid certificate chain.'); |
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Assertion::keyExists($nextCertParsed['extensions'], 'basicConstraints', 'Invalid certificate chain.'); |
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Assertion::startsWith($nextCertParsed['extensions']['basicConstraints'], 'CA:TRUE', 'Invalid certificate chain.'); |
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$purpose = X509_PURPOSE_CRL_SIGN; |
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$currentCert = $nextCertAsPem; |
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$currentCertParsed = $nextCertParsed; |
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} |
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\Safe\fclose($file); |
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//We check the last certificate is a root certificate |
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$currentCertIssuer = \Safe\json_encode($currentCertParsed['issuer']); |
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$currentCertSubject = \Safe\json_encode($currentCertParsed['subject']); |
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Assertion::eq($currentCertIssuer, $currentCertSubject, 'Invalid certificate chain.'); |
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// We check that the last certificate is a CA certificate |
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Assertion::keyExists($currentCertParsed, 'extensions', 'Invalid certificate chain.'); |
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Assertion::keyExists($currentCertParsed['extensions'], 'basicConstraints', 'Invalid certificate chain.'); |
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Assertion::eq($currentCertParsed['extensions']['basicConstraints'], 'CA:TRUE', 'Invalid certificate chain.'); |
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return $firstCert; |
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} |
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private static function getX509Certificate(string $publicKey): string |
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{ |
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$derCertificate = self::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 static 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::getCertificateHashes(), 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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* @return string[] |
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*/ |
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private static function getCertificateHashes(): array |
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{ |
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return [ |
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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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} |
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} |
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Spomky-Labs /
u2f-php
