SessionManagement5ChangePassword.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.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.ResourceBundle;

import javax.servlet.ServletException;
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 Five - 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 SessionManagement5ChangePassword extends HttpServlet
{

	private static final long serialVersionUID = 1L;
	private static org.apache.log4j.Logger log = Logger.getLogger(SessionManagement5ChangePassword.class);
	private static String levelName = "Session Management Challenge Five (Change Password)";
	// private static String levelResult = ""; //This Servlet does not return a result
	/**
	 * Function used by Session Management Challenge Five to change the password of the submitted user name. The function requires a valid token which is a base64'd timestamp. If the current time is within 10 minutes of the token, the function will execute 
	 * @param userName User cookie used to store the user password to be reset
	 * @param newPassword the password which to use to update an accounts password
	 * @param resetPasswordToken Base64'd time stamp
	 */
	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.sessionManagement5", 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 errorMessage = new String();
			int tokenLife = 11;
			try
			{
				log.debug("Getting Challenge Parameters");
				Object passNewObj = request.getParameter("newPassword");
				Object userNewObj = request.getParameter("userName");
				Object tokenObj = request.getParameter("resetPasswordToken");
				String userName = new String();
				String newPass = new String();
				String token = new String();
				if(passNewObj != null)
					newPass = (String) passNewObj;
				if(userNewObj != null)
					userName = (String) userNewObj;
				if(tokenObj != null)
					token = (String) tokenObj;
				log.debug("userName = " + userName);
				log.debug("newPass = " + newPass);
				log.debug("token = " + token);
				String tokenTime = new String();
				try
				{
					byte[] decodedToken = Base64.decodeBase64(token);
					tokenTime = new String(decodedToken, "UTF-8");
				}
				catch (UnsupportedEncodingException e)
				{
					log.debug("Could not decode password token");
					errorMessage += "<p>" + bundle.getString("changePass.noDecode") + "</p>";
				}
				if(tokenTime.isEmpty())
				{
					log.debug("Could not decode token. Ending Servlet.");
					out.write(errorMessage);
				}
				else
				{
					log.debug("Decoded Token = " + tokenTime);
					
					//Get Time from Token and see if it is inside the last 10 minutes
					SimpleDateFormat simpleDateFormat = new SimpleDateFormat("EEE MMM d HH:mm:ss Z yyyy");
					try 
					{
						Date tokenDateTime = simpleDateFormat.parse(tokenTime);
						Date currentDateTime = new Date();
						//Get difference in minutes
						tokenLife = (int)((currentDateTime.getTime()/60000) - (tokenDateTime.getTime()/60000));
						log.debug("Token life = " + tokenLife);
					} 
					catch (ParseException e) 
					{
						log.error("Date Parsing Error: " + e.toString());
						errorMessage += bundle.getString("changePass.badTokenData") + ": " + e.toString();
					}
					
					if(tokenLife < 10 && tokenLife >= 0)
					{
						if(newPass.length() >= 12)
						{
							log.debug("Getting ApplicationRoot");
							String ApplicationRoot = getServletContext().getRealPath("");
							log.debug("Servlet root = " + ApplicationRoot );
							
							Connection conn = Database.getChallengeConnection(ApplicationRoot, "BrokenAuthAndSessMangChalFive");
							log.debug("Changing password for user: " + userName);
							log.debug("Changing password to: " + newPass);
							PreparedStatement callstmt;
							
							callstmt = conn.prepareStatement("UPDATE users SET userPassword = SHA(?) WHERE userName = ?");
							
							callstmt.setString(1, newPass); 
							callstmt.setString(2, userName);
							
							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("changePass.success") + "</p>";
						}
						else
						{
							log.debug("Invalid password submitted: " + newPass);
							htmlOutput = "<p>" + bundle.getString("changePass.failure") + "</p>";
						}
					}
					else
					{
						if(!errorMessage.isEmpty())
						{
							htmlOutput = "<p><font colour='red'><b>" + errorMessage + "</b></font</p>";
						}
						else if(tokenLife >= 10)
						{
							log.debug("Token too old");
							htmlOutput = "<p>" + bundle.getString("changePass.oldToken") + "</p>";
						}
						else if (tokenLife < 0)
						{
							log.debug("Token to young");
							htmlOutput = "<p>" + bundle.getString("changePass.youngToken") + "</p>";
						}
						else
						{
							log.error("Token to Strange: Unexpected Error");
							htmlOutput = "<p>" + bundle.getString("changePass.funkyToken") + "</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");
		}
	}
	
}