SqlInjection5CouponCheck.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;

/**
 * Level : SQL Injection Challenge 5 <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 SqlInjection5CouponCheck extends HttpServlet {

  private static final String levelName = "SQLi C5 CouponCheck";
  private static final long serialVersionUID = 1L;
  private static final Logger log = LogManager.getLogger(SqlInjection5CouponCheck.class);

  /** //TODO - JavaDoc */
  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.sqli5", 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 couponCode = request.getParameter("couponCode");
        log.debug("couponCode - " + couponCode);
        if (couponCode == null || couponCode.isEmpty()) {
          couponCode = new String();
        }

        htmlOutput = new String("");
        Connection conn =
            Database.getChallengeConnection(applicationRoot, "SqlInjectionChallenge5ShopCoupon");
        log.debug("Looking for Coupons Insecurely");
        PreparedStatement prepstmt =
            conn.prepareStatement(
                "SELECT itemId, perCentOff, itemName FROM coupons JOIN items USING (itemId) WHERE"
                    + " couponCode = '"
                    + couponCode
                    + "';");
        ResultSet coupons = prepstmt.executeQuery();
        try {
          if (coupons.next()) {
            htmlOutput = new String("Valid Coupon for ");
            log.debug("Found coupon for %" + coupons.getInt(2));
            log.debug("For Item Name " + coupons.getString(3));
            htmlOutput +=
                ""
                    + bundle.getString("response.percent")
                    + ""
                    + coupons.getInt(2)
                    + " "
                    + bundle.getString("response.off")
                    + " "
                    + Encode.forHtml(coupons.getString(3))
                    + " "
                    + bundle.getString("response.items")
                    + "";
          } else {
            htmlOutput = "" + bundle.getString("response.noCoupon") + "";
          }
        } catch (Exception e) {
          log.debug("Could Not Find Coupon: " + e.toString());
        }
        conn.close();
      } catch (Exception e) {
        log.debug("Did complete Check: " + e.toString());
        htmlOutput = "" + bundle.getString("errors.Occurred") + "" + Encode.forHtml(e.toString());
      }
      try {
        Thread.sleep(1000);
      } catch (Exception e) {
        log.error("Failed to Pause: " + e.toString());
      }
      out.write(htmlOutput);
    } else {
      log.error(levelName + " servlet accessed with no session");
    }
  }
}