DirectObject1.java

package servlets.module.challenge;

import dbProcs.Database;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Locale;
import java.util.ResourceBundle;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.owasp.encoder.Encode;
import utils.ShepherdLogManager;
import utils.Validate;

/**
 * Insecure Direct Object Challenge Challenge One Does not use user specific key because key is
 * currently hard coded into database schema <br>
 * <br>
 * This file is part of the Security Shepherd Project.
 *
 * <p>The Security Shepherd project is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.<br>
 *
 * <p>The Security Shepherd project is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. See the GNU General Public License for more details.<br>
 *
 * <p>You should have received a copy of the GNU General Public License along with the Security
 * Shepherd project. If not, see <http://www.gnu.org/licenses/>.
 *
 * @author Mark Denihan
 */
public class DirectObject1 extends HttpServlet {

  private static final long serialVersionUID = 1L;
  private static final Logger log = LogManager.getLogger(DirectObject1.class);
  private static String levelName = "Insecure Direct Object Challenge Challenge One";
  public static String levelHash =
      "o9a450a64cc2a196f55878e2bd9a27a72daea0f17017253f87e7ebd98c71c98c";

  /**
   * The user must abuse this functionality to reveal a hidden user. The result key is hidden in
   * this users profile.
   *
   * @param userId To be used in generating the HTML output
   */
  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    // Setting IpAddress To Log and taking header for original IP if forwarded from proxy
    ShepherdLogManager.setRequestIp(request.getRemoteAddr(), request.getHeader("X-Forwarded-For"));

    // Translation Stuff
    Locale locale = new Locale(Validate.validateLanguage(request.getSession()));
    ResourceBundle errors = ResourceBundle.getBundle("i18n.servlets.errors", locale);
    ResourceBundle bundle =
        ResourceBundle.getBundle("i18n.servlets.challenges.directObject.directObjectRef1", locale);

    HttpSession ses = request.getSession(true);
    if (Validate.validateSession(ses)) {
      ShepherdLogManager.setRequestIp(
          request.getRemoteAddr(),
          request.getHeader("X-Forwarded-For"),
          ses.getAttribute("userName").toString());
      log.debug(levelName + " servlet accessed by: " + ses.getAttribute("userName").toString());
      PrintWriter out = response.getWriter();
      out.print(getServletInfo());
      try {
        String userId = request.getParameter("userId[]");
        log.debug("User Submitted - " + userId);
        String ApplicationRoot = getServletContext().getRealPath("");
        log.debug("Servlet root = " + ApplicationRoot);
        String htmlOutput = new String();

        Connection conn =
            Database.getChallengeConnection(ApplicationRoot, "directObjectRefChalOne");
        PreparedStatement prepstmt =
            conn.prepareStatement("SELECT userName, privateMessage FROM users WHERE userId = ?");
        prepstmt.setString(1, userId);
        ResultSet resultSet = prepstmt.executeQuery();
        if (resultSet.next()) {
          log.debug("Found user: " + resultSet.getString(1));
          String userName = resultSet.getString(1);
          String privateMessage = resultSet.getString(2);
          htmlOutput =
              "<h2 class='title'>"
                  + userName
                  + "'s "
                  + bundle.getString("response.message")
                  + "</h2>"
                  + "<p>"
                  + privateMessage
                  + "</p>";
        } else {
          log.debug("No Profile Found");

          htmlOutput =
              "<h2 class='title'>"
                  + bundle.getString("response.notFound")
                  + "</h2><p>"
                  + bundle.getString("response.notFoundMessage.1")
                  + " '"
                  + Encode.forHtml(userId)
                  + "' "
                  + bundle.getString("response.notFoundMessage.2")
                  + "</p>";
        }
        log.debug("Outputting HTML");
        out.write(htmlOutput);
        Database.closeConnection(conn);
      } catch (Exception e) {
        out.write(errors.getString("error.funky"));
        log.fatal(levelName + " - " + e.toString());
      }
    } else {
      log.error(levelName + " servlet accessed with no session");
    }
  }
}