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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\Module\casserver\Cas; |
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use SimpleSAML\Configuration; |
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use SimpleSAML\Logger; |
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use SimpleSAML\Module\casserver\Codebooks\OverrideConfigPropertiesEnum; |
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/** |
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* Validates if a CAS service can use server |
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* @package SimpleSAML\Module\casserver\Cas |
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*/ |
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class ServiceValidator |
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{ |
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/** |
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* @var \SimpleSAML\Configuration |
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*/ |
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private Configuration $mainConfig; |
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/** |
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* ServiceValidator constructor. |
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* @param Configuration $mainConfig |
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*/ |
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public function __construct(Configuration $mainConfig) |
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{ |
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$this->mainConfig = $mainConfig; |
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} |
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/** |
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* Check that the $service is allowed, and if so return the configuration to use. |
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* |
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* @param string $service The service url. Assume to already be url decoded |
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* |
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* @return Configuration|null Return the configuration to use for this service, or null if service is not allowed |
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* @throws \ErrorException |
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*/ |
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public function checkServiceURL(string $service): ?Configuration |
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{ |
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$isValidService = false; |
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$legalUrl = 'undefined'; |
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$configOverride = null; |
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$legalServiceUrlsConfig = $this->mainConfig->getOptionalArray('legal_service_urls', []); |
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foreach ($legalServiceUrlsConfig as $index => $value) { |
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// Support two styles: 0 => 'https://example' and 'https://example' => [ extra config ] |
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$legalUrl = \is_int($index) ? $value : $index; |
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if (empty($legalUrl)) { |
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Logger::warning("Ignoring empty CAS legal service url '$legalUrl'."); |
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continue; |
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} |
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$configOverride = \is_int($index) ? null : $value; |
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if ($isValidService = $this->validateServiceIsLegal($legalUrl, $service)) { |
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break; |
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} |
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} |
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if (!$isValidService) { |
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return null; |
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} |
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$serviceConfig = $this->mainConfig->toArray(); |
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// Return contextual information about which url rule triggered the validation |
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$serviceConfig['casService'] = [ |
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'matchingUrl' => $legalUrl, |
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'serviceUrl' => $service, |
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]; |
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if ($configOverride !== null) { |
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// We need to remove all the unsupported configuration keys |
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$supportedProperties = array_column(OverrideConfigPropertiesEnum::cases(), 'value'); |
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$configOverride = array_filter( |
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$configOverride, |
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static fn($property) => \in_array($property, $supportedProperties, true), |
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ARRAY_FILTER_USE_KEY, |
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); |
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// Merge the configurations |
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$serviceConfig = array_merge($serviceConfig, $configOverride); |
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} |
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return Configuration::loadFromArray($serviceConfig); |
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} |
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/** |
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* @param string $legalUrl The string or regex to use for comparison |
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* @param string $service The service to compare |
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* |
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* @return bool Whether the service is legal |
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* @throws \ErrorException |
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*/ |
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protected function validateServiceIsLegal(string $legalUrl, string $service): bool |
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{ |
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$isValid = false; |
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if (!ctype_alnum($legalUrl[0])) { |
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// Since "If the regex pattern passed does not compile to a valid regex, an E_WARNING is emitted. " |
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// we will throw an exception if the warning is emitted and use try-catch to handle it |
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set_error_handler(static function ($severity, $message, $file, $line) { |
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throw new \ErrorException($message, $severity, $severity, $file, $line); |
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}, E_WARNING); |
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try { |
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if (preg_match($legalUrl, $service) === 1) { |
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$isValid = true; |
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} |
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} catch (\ErrorException $e) { |
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// do nothing |
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Logger::warning("Invalid CAS legal service url '$legalUrl'. Error " . preg_last_error_msg()); |
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} finally { |
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restore_error_handler(); |
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} |
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} elseif (str_starts_with($service, $legalUrl)) { |
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$isValid = true; |
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} |
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return $isValid; |
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} |
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} |
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simplesamlphp /
simplesamlphp-module-casserver
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