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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** |
| 6 | * SPDX-FileCopyrightText: 2026 LibreCode coop and contributors |
| 7 | * SPDX-License-Identifier: AGPL-3.0-or-later |
| 8 | */ |
| 9 | |
| 10 | namespace OCA\Libresign\Service\Crl; |
| 11 | |
| 12 | use OCA\Libresign\Enum\CrlValidationStatus; |
| 13 | use OCA\Libresign\Exception\CrlGenerationInProgressException; |
| 14 | use OCA\Libresign\Service\Crl\Ldap\LdapCrlDownloader; |
| 15 | use OCA\Libresign\Service\Policy\PolicyService; |
| 16 | use OCA\Libresign\Service\Policy\Provider\CrlValidation\CrlValidationPolicy; |
| 17 | use OCP\ICache; |
| 18 | use OCP\ICacheFactory; |
| 19 | use OCP\IConfig; |
| 20 | use OCP\ITempManager; |
| 21 | use OCP\IURLGenerator; |
| 22 | use Psr\Log\LoggerInterface; |
| 23 | |
| 24 | /** |
| 25 | * Verifies whether a certificate has been revoked by checking its embedded |
| 26 | * CRL Distribution Point URLs. Supports HTTP/HTTPS, LDAP (RFC 4516), and |
| 27 | * local LibreSign-managed CRL endpoints. |
| 28 | */ |
| 29 | class CrlRevocationChecker { |
| 30 | /** Cached result of {@see getLocalCrlPattern()} — built once per request. */ |
| 31 | private ?string $localCrlPattern = null; |
| 32 | |
| 33 | /** @var array<string, string|null> */ |
| 34 | private array $localCrlRequestCache = []; |
| 35 | |
| 36 | /** @var array<string, string|null> */ |
| 37 | private array $parsedCrlTextRequestCache = []; |
| 38 | |
| 39 | /** @var array<string, array{status: CrlValidationStatus, revoked_at?: string}> */ |
| 40 | private array $validationResultRequestCache = []; |
| 41 | |
| 42 | /** Distributed cache for externally downloaded CRL content (TTL: 24 h). */ |
| 43 | private ICache $cache; |
| 44 | |
| 45 | private const BINARY_CACHE_PREFIX = 'base64:'; |
| 46 | private const PARSED_TEXT_CACHE_PREFIX = 'parsed_text:'; |
| 47 | private const PARSED_TEXT_CACHE_TTL = 86400; |
| 48 | |
| 49 | public function __construct( |
| 50 | private IConfig $config, |
| 51 | private PolicyService $policyService, |
| 52 | private IURLGenerator $urlGenerator, |
| 53 | private ITempManager $tempManager, |
| 54 | private LoggerInterface $logger, |
| 55 | ICacheFactory $cacheFactory, |
| 56 | private LdapCrlDownloader $ldapDownloader, |
| 57 | ) { |
| 58 | $this->cache = $cacheFactory->createDistributed('libresign_crl'); |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * Validate a certificate against the CRL Distribution Points found in its |
| 63 | * data. Returns an array with a 'status' key (always {@see CrlValidationStatus}) |
| 64 | * and optionally 'revoked_at' (ISO 8601) when the certificate is revoked. |
| 65 | * |
| 66 | * @param string|null $policyUserId Resolve the CRL policy in the context of this user when provided. |
| 67 | * @return array{status: CrlValidationStatus, revoked_at?: string} |
| 68 | */ |
| 69 | public function validate(array $crlUrls, string $certPem, ?string $policyUserId = null): array { |
| 70 | return $this->validateFromUrlsWithDetails($crlUrls, $certPem, $policyUserId); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Internal validation worker that iterates through CRL distribution points |
| 75 | * and returns the validation status from the first accessible/conclusive point. |
| 76 | * |
| 77 | * @return array{status: CrlValidationStatus, revoked_at?: string} |
| 78 | */ |
| 79 | private function validateFromUrlsWithDetails(array $crlUrls, string $certPem, ?string $policyUserId = null): array { |
| 80 | $normalizedPolicyUserId = is_string($policyUserId) ? trim($policyUserId) : ''; |
| 81 | $externalValidationEnabled = $normalizedPolicyUserId !== '' |
| 82 | ? $this->policyService->resolveForUserId(CrlValidationPolicy::KEY, $normalizedPolicyUserId)->getEffectiveValueAsBool(true) |
| 83 | : $this->policyService->resolve(CrlValidationPolicy::KEY)->getEffectiveValueAsBool(true); |
| 84 | |
| 85 | if (empty($crlUrls)) { |
| 86 | // When external validation is disabled, treat an empty distribution-point |
| 87 | // list the same as if all points were intentionally skipped. |
| 88 | if (!$externalValidationEnabled) { |
| 89 | return ['status' => CrlValidationStatus::DISABLED]; |
| 90 | } |
| 91 | return ['status' => CrlValidationStatus::NO_URLS]; |
| 92 | } |
| 93 | |
| 94 | $accessibleUrls = 0; |
| 95 | $disabledUrls = 0; |
| 96 | $legacyDistributionPoints = 0; |
| 97 | foreach ($crlUrls as $crlUrl) { |
| 98 | try { |
| 99 | $isLocal = $this->isLocalCrlUrl($crlUrl); |
| 100 | if ($isLocal && $this->isLegacyLocalCrlUrl($crlUrl)) { |
| 101 | $legacyDistributionPoints++; |
| 102 | continue; |
| 103 | } |
| 104 | // Skip external CRL validation when disabled by admin, but always |
| 105 | // validate local LibreSign-managed CRLs. |
| 106 | if (!$externalValidationEnabled && !$isLocal) { |
| 107 | $disabledUrls++; |
| 108 | continue; |
| 109 | } |
| 110 | $validationResult = $this->downloadAndValidateWithDetails($crlUrl, $certPem, $isLocal); |
| 111 | if ($validationResult['status'] === CrlValidationStatus::VALID) { |
| 112 | return $validationResult; |
| 113 | } |
| 114 | if ($validationResult['status'] === CrlValidationStatus::REVOKED) { |
| 115 | return $validationResult; |
| 116 | } |
| 117 | // Only count as accessible if we actually reached the server and parsed |
| 118 | // a CRL response – validation_error means the download itself failed. |
| 119 | if ($validationResult['status'] !== CrlValidationStatus::VALIDATION_ERROR) { |
| 120 | $accessibleUrls++; |
| 121 | } |
| 122 | } catch (\Exception) { |
| 123 | continue; |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | if ($legacyDistributionPoints > 0 && $accessibleUrls === 0) { |
| 128 | return ['status' => CrlValidationStatus::LEGACY_DISTRIBUTION_POINT]; |
| 129 | } |
| 130 | |
| 131 | // All distribution points were intentionally skipped because the admin |
| 132 | // disabled external CRL validation. |
| 133 | if ($disabledUrls > 0 && $accessibleUrls === 0) { |
| 134 | return ['status' => CrlValidationStatus::DISABLED]; |
| 135 | } |
| 136 | |
| 137 | if ($accessibleUrls === 0) { |
| 138 | return ['status' => CrlValidationStatus::URLS_INACCESSIBLE]; |
| 139 | } |
| 140 | |
| 141 | return ['status' => CrlValidationStatus::VALIDATION_FAILED]; |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Download and validate CRL content from a single source URL. |
| 146 | * |
| 147 | * @return array{status: CrlValidationStatus, revoked_at?: string} |
| 148 | */ |
| 149 | private function downloadAndValidateWithDetails(string $crlUrl, string $certPem, bool $isLocal): array { |
| 150 | try { |
| 151 | if ($isLocal) { |
| 152 | $crlContent = $this->generateLocalCrl($crlUrl); |
| 153 | } elseif ($this->ldapDownloader->isLdapUrl($crlUrl)) { |
| 154 | $crlContent = $this->ldapDownloader->download($crlUrl); |
| 155 | } else { |
| 156 | $crlContent = $this->downloadCrlContent($crlUrl); |
| 157 | } |
| 158 | |
| 159 | if (!$crlContent) { |
| 160 | throw new \Exception('Failed to get CRL content'); |
| 161 | } |
| 162 | |
| 163 | return $this->checkCertificateInCrlWithDetails($certPem, $crlContent); |
| 164 | } catch (\Exception) { |
| 165 | return ['status' => CrlValidationStatus::VALIDATION_ERROR]; |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | private function isLegacyLocalCrlUrl(string $url): bool { |
| 170 | $path = parse_url($url, PHP_URL_PATH); |
| 171 | if (!is_string($path)) { |
| 172 | return false; |
| 173 | } |
| 174 | |
| 175 | $templateUrl = $this->urlGenerator->linkToRouteAbsolute('libresign.crl.getRevocationList', [ |
| 176 | 'instanceId' => 'INSTANCEID', |
| 177 | 'generation' => 999999, |
| 178 | 'engineType' => 'ENGINETYPE', |
| 179 | ]); |
| 180 | $templatePath = parse_url($templateUrl, PHP_URL_PATH); |
| 181 | if (!is_string($templatePath)) { |
| 182 | return false; |
| 183 | } |
| 184 | |
| 185 | $routePosition = strrpos($templatePath, '/apps/libresign/crl/'); |
| 186 | if ($routePosition === false) { |
| 187 | return false; |
| 188 | } |
| 189 | |
| 190 | $webroot = substr($templatePath, 0, $routePosition); |
| 191 | if (str_ends_with($webroot, '/index.php')) { |
| 192 | $webroot = substr($webroot, 0, -strlen('/index.php')); |
| 193 | } |
| 194 | |
| 195 | $pattern = '#^' . preg_quote($webroot, '#') . '/(?:index\\.php/)?apps/libresign/crl/?$#'; |
| 196 | return preg_match($pattern, $path) === 1; |
| 197 | } |
| 198 | |
| 199 | private function isLocalCrlUrl(string $url): bool { |
| 200 | $host = parse_url($url, PHP_URL_HOST); |
| 201 | if (!$host) { |
| 202 | return false; |
| 203 | } |
| 204 | |
| 205 | $trustedDomains = $this->config->getSystemValue('trusted_domains', []); |
| 206 | |
| 207 | return in_array($host, $trustedDomains, true); |
| 208 | } |
| 209 | |
| 210 | protected function generateLocalCrl(string $crlUrl): ?string { |
| 211 | if (array_key_exists($crlUrl, $this->localCrlRequestCache)) { |
| 212 | return $this->localCrlRequestCache[$crlUrl]; |
| 213 | } |
| 214 | |
| 215 | try { |
| 216 | $pattern = $this->getLocalCrlPattern(); |
| 217 | if (preg_match($pattern, $crlUrl, $matches)) { |
| 218 | $instanceId = $matches[1]; |
| 219 | $generation = (int)$matches[2]; |
| 220 | $engineType = $matches[3]; |
| 221 | |
| 222 | return $this->localCrlRequestCache[$crlUrl] = $this->getCrlService()->generateCrlDer($instanceId, $generation, $engineType); |
| 223 | } |
| 224 | |
| 225 | $this->logger->debug('CRL URL does not match expected pattern', ['url' => $crlUrl, 'pattern' => $pattern]); |
| 226 | return $this->localCrlRequestCache[$crlUrl] = null; |
| 227 | } catch (\Exception $e) { |
| 228 | if ($e instanceof \RuntimeException && str_starts_with($e->getMessage(), 'Config path does not exist for instanceId:')) { |
| 229 | $this->logger->debug('Skipping local CRL generation because source PKI config path is missing', [ |
| 230 | 'reason' => $e->getMessage(), |
| 231 | ]); |
| 232 | } elseif ($e instanceof CrlGenerationInProgressException) { |
| 233 | $this->logger->debug('Local CRL generation is already in progress', [ |
| 234 | 'reason' => $e->getMessage(), |
| 235 | ]); |
| 236 | } else { |
| 237 | $this->logger->warning('Failed to generate local CRL: ' . $e->getMessage()); |
| 238 | } |
| 239 | return $this->localCrlRequestCache[$crlUrl] = null; |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | /** |
| 244 | * Lazy-loaded to avoid a circular dependency: |
| 245 | * CrlService → CertificateEngineFactory → OpenSslHandler → CrlRevocationChecker → CrlService |
| 246 | */ |
| 247 | protected function getCrlService(): CrlService { |
| 248 | /** @var CrlService */ |
| 249 | return \OCP\Server::get(CrlService::class); |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * Builds and memoises the regex pattern used to recognise local LibreSign |
| 254 | * CRL URLs. The pattern is constructed once per request from the configured |
| 255 | * URL generator and then cached in a property to avoid redundant work on |
| 256 | * installations that validate many certificates in a single request. |
| 257 | */ |
| 258 | protected function getLocalCrlPattern(): string { |
| 259 | if ($this->localCrlPattern !== null) { |
| 260 | return $this->localCrlPattern; |
| 261 | } |
| 262 | |
| 263 | $templateUrl = $this->urlGenerator->linkToRouteAbsolute('libresign.crl.getRevocationList', [ |
| 264 | 'instanceId' => 'INSTANCEID', |
| 265 | 'generation' => 999999, |
| 266 | 'engineType' => 'ENGINETYPE', |
| 267 | ]); |
| 268 | |
| 269 | // Match the path only and accept any scheme/host: the CRL DP host is fixed |
| 270 | // at certificate issuance and may differ from the request host (already |
| 271 | // vetted as trusted by isLocalCrlUrl()). |
| 272 | $templatePath = parse_url($templateUrl, PHP_URL_PATH) ?: $templateUrl; |
| 273 | |
| 274 | $patternPath = str_replace('INSTANCEID', '([^/_]+)', $templatePath); |
| 275 | $patternPath = str_replace('999999', '(\d+)', $patternPath); |
| 276 | $patternPath = str_replace('ENGINETYPE', '([^/_]+)', $patternPath); |
| 277 | |
| 278 | $escapedPattern = str_replace([':', '/', '.'], ['\:', '\/', '\.'], $patternPath); |
| 279 | $escapedPattern = str_replace('\/apps\/', '(?:\/index\.php)?\/apps\/', $escapedPattern); |
| 280 | |
| 281 | $this->localCrlPattern = '/^https?\:\/\/[^\/]+' . $escapedPattern . '$/'; |
| 282 | return $this->localCrlPattern; |
| 283 | } |
| 284 | |
| 285 | protected function downloadCrlContent(string $url): ?string { |
| 286 | if (!filter_var($url, FILTER_VALIDATE_URL) || !in_array(parse_url($url, PHP_URL_SCHEME), ['http', 'https'])) { |
| 287 | return null; |
| 288 | } |
| 289 | |
| 290 | $cacheKey = sha1($url); |
| 291 | $cached = $this->cache->get($cacheKey); |
| 292 | if ($cached !== null) { |
| 293 | return is_string($cached) ? $this->decodeCachedBinaryContent($cached) : null; |
| 294 | } |
| 295 | |
| 296 | $context = stream_context_create([ |
| 297 | 'http' => [ |
| 298 | 'timeout' => 30, |
| 299 | 'user_agent' => 'LibreSign/1.0 CRL Validator', |
| 300 | 'follow_location' => 1, |
| 301 | 'max_redirects' => 3, |
| 302 | ] |
| 303 | ]); |
| 304 | |
| 305 | $content = $this->fetchRemoteCrlContent($url, $context); |
| 306 | if ($content === false) { |
| 307 | return null; |
| 308 | } |
| 309 | |
| 310 | $this->cache->set($cacheKey, $this->encodeCacheableBinaryContent($content), 86400); |
| 311 | return $content; |
| 312 | } |
| 313 | |
| 314 | /** |
| 315 | * @param resource $context |
| 316 | */ |
| 317 | protected function fetchRemoteCrlContent(string $url, $context): string|false { |
| 318 | return @file_get_contents($url, false, $context); |
| 319 | } |
| 320 | |
| 321 | private function encodeCacheableBinaryContent(string $content): string { |
| 322 | return self::BINARY_CACHE_PREFIX . base64_encode($content); |
| 323 | } |
| 324 | |
| 325 | private function decodeCachedBinaryContent(string $cachedContent): string { |
| 326 | if (!str_starts_with($cachedContent, self::BINARY_CACHE_PREFIX)) { |
| 327 | return $cachedContent; |
| 328 | } |
| 329 | |
| 330 | $decoded = base64_decode(substr($cachedContent, strlen(self::BINARY_CACHE_PREFIX)), true); |
| 331 | return $decoded === false ? $cachedContent : $decoded; |
| 332 | } |
| 333 | |
| 334 | protected function isSerialNumberInCrl(string $crlText, string $serialNumber): bool { |
| 335 | $normalizedSerial = strtoupper($serialNumber); |
| 336 | $normalizedSerial = ltrim($normalizedSerial, '0') ?: '0'; |
| 337 | |
| 338 | return preg_match('/Serial Number: 0*' . preg_quote($normalizedSerial, '/') . '/', $crlText) === 1; |
| 339 | } |
| 340 | |
| 341 | /** |
| 342 | * Check if certificate serial is revoked in the provided CRL content. |
| 343 | * |
| 344 | * @return array{status: CrlValidationStatus, revoked_at?: string} |
| 345 | */ |
| 346 | private function checkCertificateInCrlWithDetails(string $certPem, string $crlContent): array { |
| 347 | try { |
| 348 | $certResource = openssl_x509_read($certPem); |
| 349 | if (!$certResource) { |
| 350 | return ['status' => CrlValidationStatus::VALIDATION_ERROR]; |
| 351 | } |
| 352 | |
| 353 | $certData = openssl_x509_parse($certResource); |
| 354 | if (!isset($certData['serialNumber'])) { |
| 355 | return ['status' => CrlValidationStatus::VALIDATION_ERROR]; |
| 356 | } |
| 357 | |
| 358 | $serialCandidates = [$certData['serialNumber']]; |
| 359 | if (!empty($certData['serialNumberHex'])) { |
| 360 | $serialCandidates[] = $certData['serialNumberHex']; |
| 361 | } |
| 362 | |
| 363 | $validationCacheKey = $this->buildValidationCacheKey($serialCandidates, $crlContent); |
| 364 | if (array_key_exists($validationCacheKey, $this->validationResultRequestCache)) { |
| 365 | return $this->validationResultRequestCache[$validationCacheKey]; |
| 366 | } |
| 367 | |
| 368 | $crlText = $this->getParsedCrlText($crlContent); |
| 369 | if ($crlText === null) { |
| 370 | return $this->validationResultRequestCache[$validationCacheKey] = ['status' => CrlValidationStatus::VALIDATION_ERROR]; |
| 371 | } |
| 372 | |
| 373 | foreach ($serialCandidates as $serial) { |
| 374 | if ($this->isSerialNumberInCrl($crlText, $serial)) { |
| 375 | $revokedAt = $this->extractRevocationDateFromCrlText($crlText, $serialCandidates); |
| 376 | return $this->validationResultRequestCache[$validationCacheKey] = array_filter([ |
| 377 | 'status' => CrlValidationStatus::REVOKED, |
| 378 | 'revoked_at' => $revokedAt, |
| 379 | ]); |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | return $this->validationResultRequestCache[$validationCacheKey] = ['status' => CrlValidationStatus::VALID]; |
| 384 | } catch (\Exception) { |
| 385 | return ['status' => CrlValidationStatus::VALIDATION_ERROR]; |
| 386 | } |
| 387 | } |
| 388 | |
| 389 | protected function getParsedCrlText(string $crlContent): ?string { |
| 390 | $contentHash = sha1($crlContent); |
| 391 | |
| 392 | if (array_key_exists($contentHash, $this->parsedCrlTextRequestCache)) { |
| 393 | return $this->parsedCrlTextRequestCache[$contentHash]; |
| 394 | } |
| 395 | |
| 396 | $cacheKey = self::PARSED_TEXT_CACHE_PREFIX . $contentHash; |
| 397 | $cached = $this->cache->get($cacheKey); |
| 398 | if ($cached !== null) { |
| 399 | return $this->parsedCrlTextRequestCache[$contentHash] = is_string($cached) ? $cached : null; |
| 400 | } |
| 401 | |
| 402 | $tempFile = $this->tempManager->getTemporaryFile('.der'); |
| 403 | if (!file_put_contents($tempFile, $crlContent)) { |
| 404 | return $this->parsedCrlTextRequestCache[$contentHash] = null; |
| 405 | } |
| 406 | |
| 407 | [$output, $exitCode] = $this->execOpenSslCrl($tempFile); |
| 408 | |
| 409 | if ($exitCode !== 0 || empty($output)) { |
| 410 | return $this->parsedCrlTextRequestCache[$contentHash] = null; |
| 411 | } |
| 412 | |
| 413 | $crlText = implode("\n", $output); |
| 414 | $this->cache->set($cacheKey, $crlText, self::PARSED_TEXT_CACHE_TTL); |
| 415 | return $this->parsedCrlTextRequestCache[$contentHash] = $crlText; |
| 416 | } |
| 417 | |
| 418 | protected function buildValidationCacheKey(array $serialCandidates, string $crlContent): string { |
| 419 | return sha1(implode(',', $serialCandidates) . ':' . sha1($crlContent)); |
| 420 | } |
| 421 | |
| 422 | /** |
| 423 | * Runs `openssl crl -text -noout` on the given DER file and returns |
| 424 | * [output_lines[], exit_code]. Extracted to allow test subclasses to |
| 425 | * override it without executing a real process. |
| 426 | */ |
| 427 | protected function execOpenSslCrl(string $tempCrlFile): array { |
| 428 | $cmd = sprintf( |
| 429 | 'openssl crl -in %s -inform DER -text -noout', |
| 430 | escapeshellarg($tempCrlFile) |
| 431 | ); |
| 432 | exec($cmd, $output, $exitCode); |
| 433 | return [$output, $exitCode]; |
| 434 | } |
| 435 | |
| 436 | protected function extractRevocationDateFromCrlText(string $crlText, array $serialNumbers): ?string { |
| 437 | foreach ($serialNumbers as $serial) { |
| 438 | $normalizedSerial = strtoupper(ltrim((string)$serial, '0')) ?: '0'; |
| 439 | $pattern = '/Serial Number:\s*0*' . preg_quote($normalizedSerial, '/') . '\s*\R\s*Revocation Date:\s*([^\r\n]+)/i'; |
| 440 | if (preg_match($pattern, $crlText, $matches) !== 1) { |
| 441 | continue; |
| 442 | } |
| 443 | $dateText = trim($matches[1]); |
| 444 | try { |
| 445 | $date = new \DateTimeImmutable($dateText, new \DateTimeZone('UTC')); |
| 446 | return $date->setTimezone(new \DateTimeZone('UTC'))->format(\DateTimeInterface::ATOM); |
| 447 | } catch (\Exception) { |
| 448 | continue; |
| 449 | } |
| 450 | } |
| 451 | return null; |
| 452 | } |
| 453 | } |