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<?php |
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namespace MadWizard\WebAuthn\Pki; |
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use DateTimeImmutable; |
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use Exception; |
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use MadWizard\WebAuthn\Cache\CacheProviderInterface; |
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use MadWizard\WebAuthn\Exception\RemoteException; |
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use MadWizard\WebAuthn\Exception\UnsupportedException; |
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use MadWizard\WebAuthn\Exception\VerificationException; |
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use MadWizard\WebAuthn\Exception\WebAuthnException; |
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use MadWizard\WebAuthn\Remote\DownloaderInterface; |
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use Psr\Cache\CacheItemPoolInterface; |
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use Psr\Log\LoggerAwareInterface; |
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use Psr\Log\LoggerInterface; |
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use Psr\Log\NullLogger; |
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use Sop\X509\Certificate\Certificate; |
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/** |
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* @experimental |
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*/ |
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final class CrlCertificateStatusResolver implements CertificateStatusResolverInterface, LoggerAwareInterface |
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{ |
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/** @var CacheItemPoolInterface */ |
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private $cache; |
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/** |
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* @var DownloaderInterface |
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*/ |
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private $downloader; |
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/** |
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* @var LoggerInterface |
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*/ |
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private $logger; |
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/** |
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* @var bool |
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*/ |
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private $silentFailure; |
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/** |
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* @experimental |
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*/ |
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public function __construct(DownloaderInterface $downloader, CacheProviderInterface $cacheProvider, bool $silentFailure = false) |
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{ |
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if (!class_exists(\phpseclib3\File\X509::class)) { |
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throw new UnsupportedException('CRL support is experimental and requires a (not yet stable) phpseclib v3. Use composer require phpseclib/phpseclib 3.0.x-dev.'); |
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} |
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$this->downloader = $downloader; |
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$this->cache = $cacheProvider->getCachePool('crl'); |
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$this->logger = new NullLogger(); |
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$this->silentFailure = $silentFailure; |
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} |
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/** |
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* @experimental |
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*/ |
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public function setLogger(LoggerInterface $logger) |
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{ |
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$this->logger = $logger; |
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} |
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/** |
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* @experimental |
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*/ |
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public function isRevoked(X509Certificate $subject, X509Certificate ...$caCertificates): bool |
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{ |
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try { |
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$cert = Certificate::fromDER($subject->asDer()); |
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$csn = $cert->tbsCertificate()->serialNumber(); |
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} catch (Exception $e) { |
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throw new VerificationException(sprintf('Failed to parse certificate: %s', $e->getMessage()), 0, $e); |
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} |
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try { |
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$urls = $this->getCrlUrlList($cert); |
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} catch (VerificationException $e) { |
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$this->logger->warning( |
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'Failed to get CRL distribution points: {message}', |
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[ |
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'message' => $e->getMessage(), |
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'exception' => $e, |
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] |
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); |
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if ($this->silentFailure) { |
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return false; |
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} |
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throw new VerificationException('Failed to get CRL distribution points: ' . $e->getMessage(), 0, $e); |
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} |
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foreach ($urls as $url) { |
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try { |
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$crl = $this->retrieveCrl($url, ...$caCertificates); |
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if ($crl->isRevoked($csn)) { |
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$this->logger->warning( |
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'Certificate {serial} with subject "{subject}" is revoked.', |
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[ |
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'serial' => $csn, |
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'subject' => $cert->tbsCertificate()->subject(), |
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] |
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); |
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return true; |
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} |
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} catch (WebAuthnException $e) { |
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if ($this->silentFailure) { |
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continue; |
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} |
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throw new VerificationException(sprintf('Failed to retrieve CRL %s:' . PHP_EOL . '%s', $url, $e->getMessage()), 0, $e); |
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} |
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} |
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return false; |
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} |
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private function retrieveCrl(string $url, X509Certificate ...$caCertificates): Crl |
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{ |
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$urlHash = hash('sha256', $url); |
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$item = $this->cache->getItem($urlHash); |
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$crlData = null; |
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if ($item->isHit()) { |
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$data = $item->get(); |
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if ($data['nextUpdate'] > new DateTimeImmutable()) { // TODO: abstract time for unit tests |
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$this->logger->debug('Using CRL from cache {url} (next update {date}).', ['url' => $url, 'date' => $data['nextUpdate']->format('Y-m-d H:i:s')]); |
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$crlData = $data['data']; |
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} |
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} |
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if ($crlData === null) { |
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try { |
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$this->logger->debug('Retrieving CRL from {url}', ['url' => $url]); |
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$crlFile = $this->downloader->downloadFile($url); |
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} catch (RemoteException $e) { |
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$this->logger->warning('Failed to download CRL for certificate from {url}: {error}', |
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['url' => $url, 'error' => $e->getMessage()]); |
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throw new VerificationException(sprintf('Failed to download CRL for certificate from %s: %s', $url, $e->getMessage())); |
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} |
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$crlData = $crlFile->getData(); |
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} |
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$crl = new Crl($crlData, ...$caCertificates); |
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if (!$item->isHit()) { |
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$item->set([ |
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'nextUpdate' => $crl->getNextUpdate(), |
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'data' => $crlData, |
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]); |
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$item->expiresAt($crl->getNextUpdate()); |
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$this->cache->save($item); |
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} |
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return $crl; |
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} |
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/** |
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* @return string[] |
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*/ |
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private function getCrlUrlList(Certificate $subject): array |
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{ |
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try { |
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$urls = []; |
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$extensions = $subject->tbsCertificate()->extensions(); |
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if ($extensions->hasCRLDistributionPoints()) { |
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$crlDists = $extensions->crlDistributionPoints(); |
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foreach ($crlDists->distributionPoints() as $dist) { |
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$url = $dist->fullName()->names()->firstURI(); |
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$scheme = parse_url($url, PHP_URL_SCHEME); |
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if (!in_array($scheme, ['http', 'https'], true)) { |
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$this->logger->warning('Ignoring non-http CRL URI {url}.', ['url' => $url]); |
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continue; |
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} |
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$urls[] = $url; |
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} |
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} |
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return $urls; |
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} catch (Exception $e) { |
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throw new VerificationException('Failed to get CRL distribution points from certificate: ' . $e->getMessage(), 0, $e); |
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} |
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} |
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} |
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madwizard-org /
webauthn-server
