SessionManagement6.java

package servlets.module.challenge;

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 javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.log4j.Logger;
import org.owasp.esapi.ESAPI;
import org.owasp.esapi.Encoder;

import utils.Hash;
import utils.ShepherdLogManager;
import utils.Validate;
import dbProcs.Database;
import dbProcs.Getter;

/**
 * Session Management Challenge Six
 * <br/><br/>
 * This file is part of the Security Shepherd Project.
 * 
 * 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/>
 * 
 * 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/>
 * 
 * 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 SessionManagement6 extends HttpServlet
{
	private static final long serialVersionUID = 1L;
	private static org.apache.log4j.Logger log = Logger.getLogger(SessionManagement6.class);
	private static String levelName = "Session Management Challenge Six";
	public static String levelHash = "b5e1020e3742cf2c0880d4098146c4dde25ebd8ceab51807bad88ff47c316ece";
	/**
	 * Users must use this functionality to sign in as an administrator to retrieve the result key.
	 * @param userName Sub schema user name
	 * @param password Sub schema user password
	 */
	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.sessionManagement.sessionManagement6", 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());
			Encoder encoder = ESAPI.encoder();
			String htmlOutput = new String();
			log.debug(levelName + " Servlet Accessed");
			try
			{
				log.debug("Getting Cookies");
				Cookie userCookies[] = request.getCookies();
				int i = 0;
				Cookie theCookie = null;
				for(i = 0; i < userCookies.length; i++)
				{
					if(userCookies[i].getName().compareTo("ac") == 0)
					{
						theCookie = userCookies[i];
						break; //End Loop, because we found the token
					}
				}
				if(theCookie != null)
				{
					log.debug("Cookie value: " + theCookie.getValue());
					
					if(theCookie.getValue().equals("ZG9Ob3RSZXR1cm5BbnN3ZXJz")) //Untampered Cookie
					{
						log.debug("Getting Challenge Parameters");
						Object nameObj = request.getParameter("subName");
						Object passObj = request.getParameter("subPassword");
						String subName = new String();
						String subPass = new String();
						String userAddress = new String();
						if(nameObj != null)
							subName = (String) nameObj;
						if(passObj != null)
							subPass = (String) passObj;
						log.debug("subName = " + subName);
						log.debug("subPass = " + subPass);
						
						log.debug("Getting ApplicationRoot");
						String ApplicationRoot = getServletContext().getRealPath("");
						
						Connection conn = Database.getChallengeConnection(ApplicationRoot, "BrokenAuthAndSessMangChalSix");
						log.debug("Checking credentials");
						PreparedStatement callstmt;
						
						log.debug("Committing changes made to database");
						callstmt = conn.prepareStatement("COMMIT");
						callstmt.execute();
						log.debug("Changes committed.");
						
						//Filtering password for !, so that it is impossible for users to sign in
						subPass = subPass.replaceAll("!", "");
						
						callstmt = conn.prepareStatement("SELECT userName, userAddress FROM users WHERE userName = ? AND userPassword = SHA(?)");
						callstmt.setString(1, subName);
						callstmt.setString(2, subPass);
						log.debug("Executing authUser");
						ResultSet resultSet = callstmt.executeQuery();
						if(resultSet.next())
						{
							//This should never happen. But just in case;
							log.debug("Successful Login");
							// Get key and add it to the output
							String userKey = Hash.generateUserSolution(Getter.getModuleResultFromHash(ApplicationRoot, levelHash), (String)ses.getAttribute("userName"));
							htmlOutput = "<h2 class='title'>" + bundle.getString("response.welcome") + " " + encoder.encodeForHTML(resultSet.getString(1)) + "</h2>" +
									"<p>" +
									bundle.getString("response.resultKey") + " <a>" + userKey + "</a>" +
									"</p>";
						}
						else
						{
							log.debug("Incorrect credentials, checking if user name correct");
							callstmt = conn.prepareStatement("SELECT userAddress FROM users WHERE userName = ?");
							callstmt.setString(1, subName);
							log.debug("Executing getAddress");
							resultSet = callstmt.executeQuery();
							if(resultSet.next())
							{
								log.debug("User Found");
								userAddress = "" + bundle.getString("response.badPass") + " <a>" + encoder.encodeForHTML(resultSet.getString(1)) + "</a><br/>";
							}
							else
							{
								userAddress = "" + bundle.getString("response.badUser") + "<br/>";
							}
							htmlOutput = makeTable(userAddress, bundle);
						}
						Database.closeConnection(conn);
						log.debug("Outputting HTML");
					}
					else
					{
						log.debug("Tampered cookie detected");
						htmlOutput = new String(bundle.getString("response.configError"));
					}
				}
				else
				{
					log.debug("Tampered cookie detected");
					htmlOutput = new String(bundle.getString("response.configError"));
				}
				out.write(htmlOutput);
			}
			catch(Exception e)
			{
				out.write(errors.getString("error.funky"));
				log.fatal(levelName + " - " + e.toString());
			}
		}
		else
		{
			log.error(levelName + " servlet accessed with no session");
		}
	}
	
	private static String makeTable (String userAddress, ResourceBundle bundle)
	{
		return "<table>" + userAddress + "<tr><td>" + bundle.getString("form.userName") + "</td><td><input type='text' id='subName'/></td></tr>" +
				"<tr><td>" + bundle.getString("form.password") + "</td><td><input type='password' id='subPassword'/></td></tr>" +
				"<tr><td colspan='2'><div id='submitButton'><input type='submit' value='" + bundle.getString("form.signIn") + "'/>" +
				"</div></td></tr>" +
				"</table>";
	}
}