| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.wicket.protocol.http; |
| |
| import jakarta.servlet.http.HttpServletRequest; |
| import jakarta.servlet.http.HttpServletResponse; |
| |
| import org.apache.wicket.request.component.IRequestablePage; |
| import org.apache.wicket.util.string.Strings; |
| |
| /** |
| * Default resource isolation policy used in {@link ResourceIsolationRequestCycleListener}, |
| * based on <a href="https://web.dev/fetch-metadata/">https://web.dev/fetch-metadata/</a>. |
| * |
| * @see <a href="https://web.dev/fetch-metadata/">https://web.dev/fetch-metadata/</a> |
| * |
| * @author Santiago Diaz - saldiaz@google.com |
| * @author Ecenaz Jen Ozmen - ecenazo@google.com |
| */ |
| public class FetchMetadataResourceIsolationPolicy implements IResourceIsolationPolicy |
| { |
| |
| public static final String SEC_FETCH_SITE_HEADER = "sec-fetch-site"; |
| public static final String SEC_FETCH_MODE_HEADER = "sec-fetch-mode"; |
| public static final String SEC_FETCH_DEST_HEADER = "sec-fetch-dest"; |
| |
| public static final String SAME_ORIGIN = "same-origin"; |
| public static final String SAME_SITE = "same-site"; |
| public static final String NONE = "none"; |
| public static final String MODE_NAVIGATE = "navigate"; |
| public static final String DEST_OBJECT = "object"; |
| public static final String DEST_EMBED = "embed"; |
| public static final String CROSS_SITE = "cross-site"; |
| public static final String CORS = "cors"; |
| public static final String DEST_SCRIPT = "script"; |
| public static final String DEST_IMAGE = "image"; |
| |
| public static final String VARY_HEADER = "Vary"; |
| |
| private static final String VARY_HEADER_VALUE = SEC_FETCH_DEST_HEADER + ", " |
| + SEC_FETCH_SITE_HEADER + ", " + SEC_FETCH_MODE_HEADER; |
| |
| @Override |
| public ResourceIsolationOutcome isRequestAllowed(HttpServletRequest request, |
| IRequestablePage targetPage) |
| { |
| // request made by a legacy browser with no support for Fetch Metadata |
| String site = request.getHeader(SEC_FETCH_SITE_HEADER); |
| if (Strings.isEmpty(site)) |
| { |
| return ResourceIsolationOutcome.UNKNOWN; |
| } |
| |
| // Allow same-site and browser-initiated requests |
| if (SAME_ORIGIN.equals(site) || SAME_SITE.equals(site) || NONE.equals(site)) |
| { |
| return ResourceIsolationOutcome.ALLOWED; |
| } |
| |
| // Allow simple top-level navigations except <object> and <embed> |
| return isAllowedTopLevelNavigation(request) |
| ? ResourceIsolationOutcome.ALLOWED |
| : ResourceIsolationOutcome.DISALLOWED; |
| } |
| |
| private boolean isAllowedTopLevelNavigation(HttpServletRequest request) |
| { |
| String mode = request.getHeader(SEC_FETCH_MODE_HEADER); |
| String dest = request.getHeader(SEC_FETCH_DEST_HEADER); |
| |
| boolean isSimpleTopLevelNavigation = MODE_NAVIGATE.equals(mode) |
| || "GET".equals(request.getMethod()); |
| boolean isNotObjectOrEmbedRequest = !DEST_EMBED.equals(dest) && !DEST_OBJECT.equals(dest); |
| |
| return isSimpleTopLevelNavigation && isNotObjectOrEmbedRequest; |
| } |
| |
| /** |
| * Set vary headers to avoid caching responses processed by Fetch Metadata. |
| * <p> |
| * Caching these responses may return 403 responses to legitimate requests |
| * defeat the protection. |
| */ |
| @Override |
| public void setHeaders(HttpServletResponse response) |
| { |
| response.addHeader(VARY_HEADER, VARY_HEADER_VALUE); |
| } |
| } |