| /* |
| * 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.knox.gateway; |
| |
| import java.io.IOException; |
| import java.util.Enumeration; |
| import java.util.Iterator; |
| import java.util.Map; |
| import javax.servlet.ServletRequest; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletRequestWrapper; |
| |
| import org.apache.knox.gateway.i18n.messages.MessagesFactory; |
| import org.eclipse.jetty.util.MultiMap; |
| import org.eclipse.jetty.util.UrlEncoded; |
| |
| /** |
| * HttpServletRequest |
| * |
| * In section SRV.3.1.1 of Servlet spec, it has been stated that any access to request parameters |
| * of an "x-www-form-urlencoded" request (e.g. using HttpServletRequest#getParameter()) |
| * can trigger the early consumption of the request InputStream. |
| * |
| * For example: |
| * $ curl -u admin:admin-password -H "X-XSRF-Header: whatever" -k -X POST -d "a=1&b=2" https://localhost:8443/gateway/sandbox/hive?doAs=KNOX |
| * |
| * The getParameter("a") will parse (and CONSUME) request body "a=1&b=2" and return "1". |
| * The request body is treated as it was a query string, even though it is not part of the URL. |
| * The parameters from the body are mixed together with the query string parameters of the URL. |
| * |
| * The problem is that various authentication filters (such as HadoopAuthFilter) check if there is a doAs parameter in request. |
| * This will consume the input stream and the dispatch will forward an empty body to the service. |
| * |
| * To avoid this problem all "x-www-form-urlencoded" requests are wrapped into UrlEncodedFormRequest. |
| * |
| * This class ignores the request body when accessing the parameters (since KNOX as a proxy doesn't care about the payload either), |
| * and it only cares about the query string. |
| * |
| */ |
| public class UrlEncodedFormRequest extends HttpServletRequestWrapper { |
| private static final GatewayMessages LOG = MessagesFactory.get(GatewayMessages.class); |
| private final MultiMap<String> queryParams; |
| |
| public UrlEncodedFormRequest(HttpServletRequest request) throws IOException { |
| super(request); |
| LOG.wrappingRequestToUrlEncodedFormRequest(request.getRequestURI()); |
| this.queryParams = parseQueryString(request.getQueryString()); |
| } |
| |
| public static boolean isUrlEncodedForm(ServletRequest request) { |
| String contentType = request.getContentType(); |
| return contentType != null && contentType.startsWith("application/x-www-form-urlencoded"); |
| } |
| |
| private MultiMap<String> parseQueryString(String queryString) { |
| MultiMap<String> params = new MultiMap<>(); |
| if (queryString != null) { |
| UrlEncoded.decodeTo(queryString, params, getCharacterEncoding()); |
| } |
| return params; |
| } |
| |
| @Override |
| public String getParameter(String name) { |
| return queryParams.getValue(name, 0); |
| } |
| |
| @Override |
| public String[] getParameterValues(String name) { |
| return getParameterMap().get(name); |
| } |
| |
| @Override |
| public Map<String, String[]> getParameterMap() { |
| return queryParams.toStringArrayMap(); |
| } |
| |
| @Override |
| public Enumeration<String> getParameterNames() { |
| final Iterator<String> iterator = queryParams.keySet().iterator(); |
| return new Enumeration<String>() { |
| @Override |
| public boolean hasMoreElements() { |
| return iterator.hasNext(); |
| } |
| |
| @Override |
| public String nextElement() { |
| return iterator.next(); |
| } |
| }; |
| } |
| } |