Parameter.java

/*
 * Copyright 2014 Google Inc. All rights reserved.
 *
 * Licensed 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 com.google.testing.security.firingrange.tests.remoteinclude;

import com.google.common.base.Splitter;
import com.google.common.base.Strings;
import com.google.testing.security.firingrange.utils.Responses;
import com.google.testing.security.firingrange.utils.Templates;

import java.io.IOException;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Handles remote inclusion XSS on parameters.
 */
public class Parameter extends HttpServlet {
  static final String ECHOED_PARAM = "q";

  @Override
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
    String echoedParam = Strings.nullToEmpty(request.getParameter(ECHOED_PARAM));

    String template;
    try {
      template = Templates.getTemplate(request, getClass());
      if (template.contains("$$TYPE$$")) {
        String type = Splitter.on('/').splitToList(request.getPathInfo()).get(2)
            .replace("\"", "").replace("_", "/");
        template = template.replace("$$TYPE$$", type);
      }
    } catch (Exception e) {
      Responses.sendError(response, "Error finding template", 400);
      return;
    }
    echoedParam = echoedParam.replace("\"", """);
    Responses.sendXssed(response, Templates.replacePayload(template, echoedParam));
  }
}