SqlInjectionEscaping.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.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
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;

/**
 * SQL Injection Escape Challenge - Does not use User specific keys <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 SqlInjectionEscaping extends HttpServlet {

  // SQL Escaping Challenge
  private static final long serialVersionUID = 1L;
  private static final Logger log = LogManager.getLogger(SqlInjectionEscaping.class);
  private static String levelName = "SQL Injection Escaping Challenge";
  public static String levelHash =
      "8c3c35c30cdbbb73b7be3a4f8587aa9d88044dc43e248984a252c6e861f673d4";

  // private static String levelResult = ""; //Stored in vulnerable DB. Not user Specific

  /**
   * This SQL Injection Module Class uses a poor escaping method to sanitise user data being sent to
   * a MySQL interpreter
   */
  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"));
    HttpSession ses = request.getSession(true);

    // 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.sqli.sqliEscaping", locale);
    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());
      String htmlOutput = new String();

      try {
        String aUserId = request.getParameter("aUserId");
        log.debug("User Submitted - " + aUserId);
        aUserId = aUserId.replaceAll("'", "\\\\'"); // Replace ' with \'
        log.debug("Escaped to - " + aUserId);
        String ApplicationRoot = getServletContext().getRealPath("");

        log.debug("Getting Connection to Database");
        Connection conn = Database.getChallengeConnection(ApplicationRoot, "SqlChallengeEscape");
        Statement stmt = conn.createStatement();
        log.debug("Gathering result set");
        ResultSet resultSet =
            stmt.executeQuery("SELECT * FROM customers WHERE customerId = '" + aUserId + "'");

        int i = 0;
        htmlOutput = "<h2 class='title'>" + bundle.getString("response.searchResults") + "</h2>";
        htmlOutput +=
            "<table><tr><th>"
                + bundle.getString("response.table.name")
                + "</th><th>"
                + bundle.getString("response.table.address")
                + "</th><th>"
                + bundle.getString("response.table.comment")
                + "</th></tr>";

        log.debug("Opening Result Set from query");
        while (resultSet.next()) {
          log.debug("Adding Customer " + resultSet.getString(2));
          htmlOutput +=
              "<tr><td>"
                  + Encode.forHtml(resultSet.getString(2))
                  + "</td><td>"
                  + Encode.forHtml(resultSet.getString(3))
                  + "</td><td>"
                  + Encode.forHtml(resultSet.getString(4))
                  + "</td></tr>";
          i++;
        }
        htmlOutput += "</table>";
        if (i == 0) {
          htmlOutput = "<p>" + bundle.getString("response.noResults") + "</p>";
        }
      } catch (SQLException e) {
        log.debug("SQL Error caught - " + e.toString());
        htmlOutput +=
            "<p>"
                + errors.getString("error.detected")
                + "</p>"
                + "<p>"
                + Encode.forHtml(e.toString())
                + "</p>";
      } catch (Exception e) {
        out.write(errors.getString("error.funky"));
        log.fatal(levelName + " - " + e.toString());
      }
      log.debug("Outputting HTML");
      out.write(htmlOutput);
    } else {
      log.error(levelName + " servlet accessed with no session");
    }
  }
}