SqlInjection6.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.Hash;
import utils.ShepherdLogManager;
import utils.Validate;

/**
 * Level : SQL Injection 6 <br>
 * <br>
 *
 * <p>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 SqlInjection6 extends HttpServlet {

  private static final String levelName = "SQLi C6";
  // private static String levelSolution =
  // "17f999a8b3fbfde54124d6e94b256a264652e5087b14622e1644c884f8a33f82";
  public static String levelHash =
      "d0e12e91dafdba4825b261ad5221aae15d28c36c7981222eb59f7fc8d8f212a2";
  private static final long serialVersionUID = 1L;
  private static final Logger log = LogManager.getLogger(SqlInjection6.class);

  /**
   * This controller makes an insecure call to a MySQL interpreter. User Input is first filtered for
   * UTF-8 attacks and afterwards is decoded from \xHEX format to UTF-8 before sent to the
   * 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 bundle = ResourceBundle.getBundle("i18n.servlets.challenges.sqli.sqli6", 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();
      String applicationRoot = getServletContext().getRealPath("");

      try {
        String userPin = (String) request.getParameter("pinNumber");
        log.debug("userPin - " + userPin);
        userPin =
            userPin.replaceAll("\\\\", "\\\\\\\\").replaceAll("'", ""); // Escape single quotes
        log.debug("userPin scrubbed - " + userPin);
        userPin =
            java.net.URLDecoder.decode(
                userPin.replaceAll("\\\\\\\\x", "%"), "UTF-8"); // Decode \x encoding
        log.debug("searchTerm decoded to - " + userPin);
        Connection conn = Database.getChallengeConnection(applicationRoot, "SqlChallengeSix");
        log.debug("Looking for users");
        PreparedStatement prepstmt =
            conn.prepareStatement("SELECT userName FROM users WHERE userPin = '" + userPin + "'");
        ResultSet users = prepstmt.executeQuery();
        try {
          if (users.next()) {
            htmlOutput =
                "<h3>"
                    + bundle.getString("response.welcomeBack")
                    + ""
                    + Encode.forHtml(users.getString(1))
                    + "</h3>"
                    + "<p>"
                    + bundle.getString("response.authNumber")
                    + ""
                    + Encode.forHtml(Hash.randomString())
                    + "</p>";
          } else {
            htmlOutput =
                "<h3>"
                    + bundle.getString("response.incorrectCreds")
                    + "</h3><p>"
                    + bundle.getString("response.carefulNow")
                    + "</p>";
          }
        } catch (Exception e) {
          htmlOutput =
              "<h3>"
                  + bundle.getString("response.incorrectCreds")
                  + "</h3><p>"
                  + bundle.getString("response.carefulNow")
                  + "</p>";
          log.debug("Could Not Find User: " + e.toString());
          try {
            Thread.sleep(1000);
          } catch (Exception e1) {
            log.error("Failed to Pause: " + e1.toString());
          }
        }
        conn.close();
      } catch (Exception e) {
        log.debug("Could not Search for User: " + e.toString());
        htmlOutput += "<p>" + bundle.getString("response.badRequest") + "</p>";
        try {
          Thread.sleep(1000);
        } catch (Exception e2) {
          log.error("Failed to Pause: " + e2.toString());
        }
      }
      log.debug("*** SQLi C6 End ***");
      out.write(htmlOutput);
    } else {
      log.error(levelName + " servlet accessed with no session");
    }
  }
}