TYPO3 v15 dev-main snapshot ()

Classes/Middleware/ContentSecurityPolicyHeaders.php

@@ -0,0 +1,113 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the TYPO3 CMS project.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+
+namespace TYPO3\CMS\Frontend\Middleware;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
+use TYPO3\CMS\Core\Cache\Frontend\FrontendInterface;
+use TYPO3\CMS\Core\Core\RequestId;
+use TYPO3\CMS\Core\Security\ContentSecurityPolicy\Configuration\CspConfigurationFactory;
+use TYPO3\CMS\Core\Security\ContentSecurityPolicy\DirectiveHashCollection;
+use TYPO3\CMS\Core\Security\ContentSecurityPolicy\Middleware\PolicyBag;
+use TYPO3\CMS\Core\Security\ContentSecurityPolicy\Middleware\ResponseService;
+use TYPO3\CMS\Core\Security\ContentSecurityPolicy\PolicyProvider;
+use TYPO3\CMS\Core\Security\ContentSecurityPolicy\Scope;
+use TYPO3\CMS\Core\Site\Entity\Site;
+
+/**
+ * Adds Content-Security-Policy headers to response.
+ *
+ * @internal
+ */
+final readonly class ContentSecurityPolicyHeaders implements MiddlewareInterface
+{
+    public function __construct(
+        private RequestId $requestId,
+        private LoggerInterface $logger,
+        #[Autowire(service: 'cache.assets')]
+        private FrontendInterface $cache,
+        private PolicyProvider $policyProvider,
+        private CspConfigurationFactory $cspConfigurationFactory,
+        private ResponseService $responseService,
+        private DirectiveHashCollection $directiveHashCollection,
+    ) {}
+
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
+    {
+        return $this->applyContentSecurityPolicy($request, $handler);
+    }
+
+    /**
+     * Apply Content-Security-Policy headers to an error response that bypassed
+     * the normal middleware stack (e.g. responses from ErrorController).
+     */
+    public function applyToResponse(ServerRequestInterface $request, ResponseInterface $response): ResponseInterface
+    {
+        return $this->applyContentSecurityPolicy($request, $response);
+    }
+
+    private function applyContentSecurityPolicy(ServerRequestInterface $request, ResponseInterface|RequestHandlerInterface $subject): ResponseInterface
+    {
+        $site = $request->getAttribute('site');
+        $cspConfiguration = $site instanceof Site ? ($site->getConfiguration()['contentSecurityPolicies'] ?? []) : [];
+        $dispositionMap = $this->cspConfigurationFactory->buildDispositionMap($cspConfiguration);
+        $behavior = $this->cspConfigurationFactory->buildBehavior($cspConfiguration);
+        // return early in case CSP shall not be used
+        if ($dispositionMap->keys() === []) {
+            return $subject instanceof RequestHandlerInterface ? $subject->handle($request) : $subject;
+        }
+        $scope = Scope::frontendSite($site);
+        $nonce = $this->requestId->nonce;
+        $policyBag = new PolicyBag($scope, $dispositionMap, $behavior, $nonce, $this->directiveHashCollection);
+        // make sure, the nonce value is set before processing the remaining components
+        $request = $request
+            ->withAttribute('nonce', $nonce)
+            ->withAttribute('csp.policyBag', $policyBag);
+        $response = $subject instanceof RequestHandlerInterface ? $subject->handle($request) : $subject;
+        if ($response->hasHeader('Content-Security-Policy') || $response->hasHeader('Content-Security-Policy-Report-Only')) {
+            if ($subject instanceof RequestHandlerInterface) {
+                $this->logger->info('Content-Security-Policy not enforced due to existence of custom header', [
+                    'scope' => (string)$scope,
+                    'uri' => (string)$request->getUri(),
+                ]);
+            }
+            return $response;
+        }
+
+        $processedEarlier = $policyBag->hasPolicies();
+        $this->policyProvider->prepare($policyBag, $request, $response);
+        foreach ($dispositionMap as $disposition => $dispositionConfiguration) {
+            $policy = $policyBag->getPolicy($disposition);
+            if ($policy->isEmpty()) {
+                continue;
+            }
+            $response = $response->withHeader(
+                $disposition->getHttpHeaderName(),
+                $policy->compile($policyBag, $this->cache)
+            );
+        }
+        if (!$processedEarlier && $policyBag->behavior->useNonce === false) {
+            $response = $this->responseService->dropNonceFromHtmlResponse($response, $nonce);
+        }
+        return $response;
+    }
+}