SessionManagement3ChangePassword.java

package servlets.module.challenge;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.sql.Connection;
import java.sql.PreparedStatement;
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.apache.commons.codec.binary.Base64;

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

/**
 * Session Management Challenge Three - Change Password
 * This is a level function - DOES NOT RETURN KEY
 * <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 SessionManagement3ChangePassword extends HttpServlet
{

	private static final long serialVersionUID = 1L;
	private static org.apache.log4j.Logger log = Logger.getLogger(SessionManagement3ChangePassword.class);
	private static String levelName = "Session Management Challenge Three (Change Password)";
	public static String levelHash = "b467dbe3cd61babc0ec599fd0c67e359e6fe04e8cdc618d537808cbb693fee8a";
	// private static String levelResult = ""; //This Servlet does not return a result
	/**
	 * Function used by Session Management Challenge Three to change the password of the submitted user name specified in the "Current" cookie
	 * @param current User cookie used to store the current user (encoded twice with base64)
	 * @param newPassword the password which to use to update an accounts 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.sessionManagement3", 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();
			log.debug(levelName + " - Change Password - Servlet");
			try
			{
				log.debug("Getting Challenge Parameters");
				Cookie userCookies[] = request.getCookies();
				int i = 0;
				Cookie theCookie = null;
				for(i = 0; i < userCookies.length; i++)
				{
					if(userCookies[i].getName().compareTo("current") == 0)
					{
						theCookie = userCookies[i];
						break; //End Loop, because we found the token
					}
				}
				Object passNewObj = request.getParameter("newPassword");
				String subName = new String();
				String subNewPass = new String();
				if(theCookie != null)
					subName = theCookie.getValue();
				if(passNewObj != null)
					subNewPass = (String) passNewObj;
				log.debug("subName = " + subName);
				//Base 64 Decode
				try
				{
					byte[] decodedName = Base64.decodeBase64(subName);
					subName = new String(decodedName, "UTF-8");
					decodedName = Base64.decodeBase64(subName);
					subName = new String(decodedName, "UTF-8");
				}
				catch (UnsupportedEncodingException e)
				{
					log.debug("Could not decode username");
					subName = new String();
				}
				log.debug("subName Decoded = " + subName);
				log.debug("subPass = " + subNewPass);
				
				if(subNewPass.length() >= 6)
				{
					log.debug("Getting ApplicationRoot");
					String ApplicationRoot = getServletContext().getRealPath("");
					
					Connection conn = Database.getChallengeConnection(ApplicationRoot, "BrokenAuthAndSessMangChalThree");
					log.debug("Changing password for user: " + subName);
					log.debug("Changing password to: " + subNewPass);
					PreparedStatement callstmt;
					
					callstmt = conn.prepareStatement("UPDATE users SET userPassword = SHA(?) WHERE userName = ?");
					callstmt.setString(1, subNewPass);
					callstmt.setString(2, subName);
					log.debug("Executing changePassword");
					callstmt.execute();
					
					log.debug("Committing changes made to database");
					callstmt = conn.prepareStatement("COMMIT");
					callstmt.execute();
					log.debug("Changes committed.");
					
					htmlOutput = "<p>" + bundle.getString("reset.password") + "</p>";
				}
				else
				{
					log.debug("invalid password submitted: " + subNewPass);
					htmlOutput = "<p>" + bundle.getString("reset.failed") + "</p>";
				}
				log.debug("Outputting HTML");
				out.write(htmlOutput);
			}
			catch(Exception e)
			{
				out.write(errors.getString("error.funky"));
				log.fatal(levelName + " - Change Password - " + e.toString());
			}
		}
		else
		{
			log.error(levelName + " servlet accessed with no session");
		}
	}
	
}