package org.owasp.webgoat.lessons;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import org.apache.ecs.Element;
import org.apache.ecs.ElementContainer;
import org.apache.ecs.StringElement;
import org.apache.ecs.html.A;
import org.apache.ecs.html.B;
import org.apache.ecs.html.Div;
import org.apache.ecs.html.Form;
import org.apache.ecs.html.H2;
import org.apache.ecs.html.Input;
import org.apache.ecs.html.TD;
import org.apache.ecs.html.TR;
import org.apache.ecs.html.Table;
import org.apache.ecs.html.TextArea;
import org.apache.ecs.xhtml.style;
import org.owasp.webgoat.session.DatabaseUtilities;
import org.owasp.webgoat.session.WebSession;


/***************************************************************************************************
 * 
 * 
 * This file is part of WebGoat, an Open Web Application Security Project utility. For details,
 * please see http://www.owasp.org/
 * 
 * Copyright (c) 2002 - 2007 Bruce Mayhew
 * 
 * This program 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 2 of the
 * License, or (at your option) any later version.
 * 
 * This program 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.
 * 
 * You should have received a copy of the GNU General Public License along with this program; if
 * not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 * 
 * Getting Source ==============
 * 
 * Source for this application is maintained at code.google.com, a repository for free software
 * projects.
 * 
 * 
 * For details, please see http://code.google.com/p/webgoat/
 * 
 * @author Reto Lippuner, Marcel Wirth
 * @created April 8, 2008
 */

public class SessionFixation extends SequentialLessonAdapter
{

	private final String mailTo = "jane.plane@owasp.org";
	private final String mailFrom = "admin@webgoatfinancial.com";
	private final String mailTitel = "Check your account";
	private final String MAILCONTENTNAME = "mailContent";

	private final static String USER = "user3";
	private final static String PASSWORD = "pass3";
	private final static String LOGGEDIN = "loggedin3";
	private final static String LOGGEDINUSER = "loggedInUser3";
	private final static Random random = new Random(System.currentTimeMillis());
	private String sid = "";

	/**
	 * Creates Staged WebContent
	 * 
	 * @param s
	 */
	protected Element createContent(WebSession s)
	{
		if(sid.equals("") && getLessonTracker(s).getStage() > 2 )
		{
			getLessonTracker(s).setStage(1);
		}
		String sid = s.getParser().getStringParameter("SID","");
		if (!sid.equals(""))
		{
			this.sid = sid;
		}
		if(!s.getParser().getStringParameter("Restart", "").equals(""))
		{
			s.add(LOGGEDIN, "false");
			s.add("SID","");
			this.sid = "";
		}
		if (getLessonTracker(s).getStage() == 3)
		{
			s.add("SID", sid);
			if (!sid.equals(""))
			{
				s.add("SID", sid);
			}
			else
			{
				String randomSid = randomSIDGenerator();
				s.add("SID", randomSid);
				this.sid = randomSid;
				System.out.println("RANDOMSID " + randomSid);
			}
			
			String name = s.getParser().getStringParameter(USER, "");
			String password = s.getParser().getStringParameter(PASSWORD, "");
			if(correctLogin(name, password, s))
			{
				getLessonTracker(s).setStage(4);
				sid="";
				s.add(LOGGEDIN, "true");
				s.add(LOGGEDINUSER, name);
				s.setMessage("You completed stage 3!");
			}
			
		}
		if(getLessonTracker(s).getStage() == 4)
		{

			if (sid.equals("NOVALIDSESSION"))
			{
				System.out.println("STAGE 5");
				getLessonTracker(s).setStage(5);
			}
					
		}

		if (getLessonTracker(s).getStage() == 2)
		{
			if (!sid.equals(""))
			{
				s.add("SID", sid);
				getLessonTracker(s).setStage(3);
				s.setMessage("You completed stage 2!");
			}
		}

		String mailContent = s.getParser().getRawParameter(MAILCONTENTNAME, "");
		if (!mailContent.equals(""))
		{
			s.add(MAILCONTENTNAME, mailContent);
		}
		if ((mailContent.contains("&SID=") || mailContent.contains("?SID=")) && getLessonTracker(s).getStage() == 1)
		{
			getLessonTracker(s).setStage(2);
			s.setMessage("You completed stage 1!");
		}

		return super.createStagedContent(s);
	}

	/**
	 * Gets the category attribute of the RoleBasedAccessControl object
	 * 
	 * @return The category value
	 */
	protected ElementContainer doStage1(WebSession s)
	{

		ElementContainer ec = new ElementContainer();
		ec.addElement(createStage1Content(s));
		return ec;

	}

	@Override
	protected Element doStage2(WebSession s) throws Exception
	{
		ElementContainer ec = new ElementContainer();
		ec.addElement(createStage2Content(s));
		return ec;
	}

	private Element createStage2Content(WebSession s)
	{
		ElementContainer ec = new ElementContainer();
		String mailHeader = "<b>Mail From:</b> &nbsp;&nbsp;admin@webgoatfinancial.com<br><br>";
		String mailContent = (String) s.get(MAILCONTENTNAME);
		
		//Reset Lesson if server was shut down
		if(mailContent == null)
		{
			getLessonTracker(s).setStage(1);
			return createStage1Content(s);
		}
		
		ec.addElement(mailHeader + mailContent);

		return ec;

	}

	@Override
	protected Element doStage3(WebSession s) throws Exception
	{
		return createStage3Content(s);
	}
	
	@Override
	protected Element doStage4(WebSession s) throws Exception
	{
		return createStage4Content(s);
	}
	
	@Override
	protected Element doStage5(WebSession s) throws Exception
	{
		System.out.println("Doing stage 5");
		return createStage5Content(s);
	}
	
	private Element createStage5Content(WebSession s)
	{
		
		return createMainLoginContent(s);
	}

	private Element createStage3Content(WebSession s)
	{
		
		return createMainLoginContent(s);
	}
	
	private Element createStage4Content(WebSession s)
	{
		ElementContainer ec = new ElementContainer();
		ec.addElement("<h2>Jane has logged into her account. Go and grab her session!" +
				" Use Following link to reach the login screen of the bank:</h2><br><br>" +
				"<a href=" + super.getLink() +"&SID=NOVALIDSESSION><center> Goat Hills Financial </center></a><br><br><br><br>");
		return ec;
		//return createMainLoginContent(s);
	}

	private Element createStage1Content(WebSession s)
	{

		String link = getLink();
		String mailText = "<b>Dear MS. Plane</b> <br><br>"
				+ "During the last week we had a few problems with our database. "
				+ "A lot of people complained that there account details are wrong. "
				+ "That is why we kindly ask you to use following link to verify your "
				+ "data:<br><br><center><a href=http://localhost/WebGoat/"
				+ link
				+ "> Goat Hills Financial</a></center><br><br>"
				+ "We are sorry for the caused inconvenience and thank you for your cooparation.<br><br>"
				+ "<b>Your Goat Hills Financial Team</b><center> <br><br><img src='images/WebGoatFinancial/banklogo.jpg'></center>";

		ElementContainer ec = new ElementContainer();
		Table table = new Table();
		TR tr1 = new TR();
		TD td1 = new TD();
		TD td2 = new TD();

		TR tr2 = new TR();
		TD td3 = new TD();
		TD td4 = new TD();

		TR tr3 = new TR();
		TD td5 = new TD();
		TD td6 = new TD();

		TR tr4 = new TR();
		TD td7 = new TD();
		td7.addAttribute("colspan", 2);

		TR tr5 = new TR();
		TD td8 = new TD();
		td8.addAttribute("colspan", 2);
		td8.addAttribute("align", "center");

		table.addElement(tr1);
		table.addElement(tr2);
		table.addElement(tr3);
		table.addElement(tr4);
		table.addElement(tr5);

		tr1.addElement(td1);
		tr1.addElement(td2);
		tr2.addElement(td3);
		tr2.addElement(td4);
		tr3.addElement(td5);
		tr3.addElement(td6);
		tr4.addElement(td7);
		tr5.addElement(td8);

		ec.addElement(table);

		B b = new B();
		b.addElement("Mail To: ");
		td1.addElement(b);
		td2.addElement(mailTo);

		b = new B();
		b.addElement("Mail From: ");
		td3.addElement(b);
		td4.addElement(mailFrom);

		b = new B();
		b.addElement("Title: ");
		td5.addElement(b);
		Input titleField = new Input();
		titleField.setValue(mailTitel);
		titleField.addAttribute("size", 30);
		td6.addElement(titleField);

		TextArea mailContent = new TextArea();
		mailContent.addAttribute("cols", 67);
		mailContent.addAttribute("rows", 8);
		mailContent.addElement(mailText);
		mailContent.setName(MAILCONTENTNAME);
		td7.addElement(mailContent);

		td8.addElement(new Input(Input.SUBMIT, "SendMail", "Send Mail"));

		return ec;
	}

	/**
	 * Creation of the main content
	 * 
	 * @param s
	 * @return Element
	 */
	protected Element createMainLoginContent(WebSession s)
	{
		ElementContainer ec = new ElementContainer();
		try
		{
			style sty = new style();

			sty
					.addElement("#lesson_wrapper {height: 435px;width: "
							+ "500px;}#lesson_header {background-image: "
							+ "url(lessons/DBSQLInjection/images/lesson1_header.jpg);width:"
							+ " 490px;padding-right: 10px;padding-top: 60px;background-repeat: no-repeat;}.lesson_workspace "
							+ "{background-image: url(lessons/DBSQLInjection/images/lesson1_workspace.jpg);width: 489px;height: "
							+ "325px;padding-left: 10px;padding-top: 10px;background-repeat: no-repeat;}		"
							+ ".lesson_text {height: 240px;width: 460px;padding-top: 5px;}			"
							+ "#lesson_buttons_bottom {height: 20px;width: 460px;}			"
							+ "#lesson_b_b_left {width: 300px;float: left;}			"
							+ "#lesson_b_b_right input {width: 100px;float: right;}			"
							+ ".lesson_title_box {height: 20px;width: 420px;padding-left: 30px;}			"
							+ ".lesson_workspace { }			"
							+ ".lesson_txt_10 {font-family: Arial, Helvetica, sans-serif;font-size: 10px;}			"
							+ ".lesson_text_db {color: #0066FF}			"
							+ "#lesson_login {background-image: url(lessons/DBSQLInjection/images/lesson1_loginWindow.jpg);height: "
							+ "124px;width: 311px;background-repeat: no-repeat;padding-top: 30px;margin-left: 80px;margin-top:"
							+ " 50px;text-align: center;}			#lesson_login_txt {font-family: Arial, Helvetica, sans-serif;font-size: "
							+ "12px;text-align: center;}			#lesson_search {background-image: "
							+ "url(lessons/DBSQLInjection/images/lesson1_SearchWindow.jpg);height: 124px;width: 311px;background-repeat: "
							+ "no-repeat;padding-top: 30px;margin-left: 80px;margin-top: 50px;text-align: center;}");
			ec.addElement(sty);

			Div wrapperDiv = new Div();
			wrapperDiv.setID("lesson_wrapper");

			Div headerDiv = new Div();
			headerDiv.setID("lesson_header");

			Div workspaceDiv = new Div();
			workspaceDiv.setClass("lesson_workspace");

			wrapperDiv.addElement(headerDiv);
			wrapperDiv.addElement(workspaceDiv);

			ec.addElement(wrapperDiv);

			workspaceDiv.addElement(createWorkspaceContent(s));

		} catch (Exception e)
		{
			s.setMessage("Error generating " + this.getClass().getName());
			e.printStackTrace();
		}

		return (ec);

	}

	/**
	 * Creation of the content of the workspace
	 * 
	 * @param s
	 * @return Element
	 */
	private Element createWorkspaceContent(WebSession s)
	{
		ElementContainer ec = new ElementContainer();
		String name = s.getParser().getStringParameter(USER, "");
		String password = s.getParser().getStringParameter(PASSWORD, "");
		
		try
		{
			// Logout Button is pressed
			if (s.getParser().getRawParameter("logout", "").equals("true"))
			{
				s.add(LOGGEDIN, "false");
				s.add("SID","");
				this.sid = "";

			}
			if (correctLogin(name, password, s))
			{
				s.add(LOGGEDINUSER, name);
				s.add(LOGGEDIN, "true");
				createSuccessfulLoginContent(s, ec);
			}
			else if (sid.equals(s.get("SID")) && s.get(LOGGEDIN).equals("true"))
			{
				makeSuccess(s);
				createSuccessfulLoginContent(s, ec);
			}
			else
			{
				if((name+password).equals(""))
				{
					createLogInContent(ec, "");

				}
				else
				{
					createLogInContent(ec, "Login Failed! Make sure user name and password is correct!");

				}
			}
		} catch (Exception e)
		{
			if((name+password).equals(""))
			{
				createLogInContent(ec, "");

			}
			else
			{
				createLogInContent(ec, "Login Failed! Make sure user name and password is correct!");
			}
		}

		return ec;
	}


	/**
	 * See if the password and corresponding user is valid
	 * 
	 * @param userName
	 * @param password
	 * @param s
	 * @return true if the password was correct
	 */
	private boolean correctLogin(String userName, String password, WebSession s)
	{
		Connection connection = null;
		try
		{
			connection = DatabaseUtilities.getConnection(s);
			String query = "SELECT * FROM user_data_tan WHERE first_name = ? AND password = ?";
			PreparedStatement prepStatement = connection.prepareStatement(query, ResultSet.TYPE_SCROLL_INSENSITIVE,
																			ResultSet.CONCUR_READ_ONLY);
			prepStatement.setString(1, userName);
			prepStatement.setString(2, password);

			ResultSet results = prepStatement.executeQuery();

			if ((results != null) && (results.first() == true)) {

			return true;

			}

		} catch (Exception e)
		{
			e.printStackTrace();
		}
		finally
		{
			try
			{
				if (connection != null)
				{
					connection.close();
				}
			}
			catch (Exception e)
			{
				e.printStackTrace();
			}
		}
		

		return false;

	}

	/**
	 * Create content for logging in
	 * 
	 * @param ec
	 */
	private void createLogInContent(ElementContainer ec, String errorMessage)
	{
		Div loginDiv = new Div();
		loginDiv.setID("lesson_login");

		Table table = new Table();
		// table.setStyle(tableStyle);
		table.addAttribute("align='center'", 0);
		TR tr1 = new TR();
		TD td1 = new TD();
		TD td2 = new TD();
		td1.addElement(new StringElement("Enter your name: "));
		td2.addElement(new Input(Input.TEXT, USER));
		tr1.addElement(td1);
		tr1.addElement(td2);

		TR tr2 = new TR();
		TD td3 = new TD();
		TD td4 = new TD();
		td3.addElement(new StringElement("Enter your password: "));
		td4.addElement(new Input(Input.PASSWORD, PASSWORD));
		tr2.addElement(td3);
		tr2.addElement(td4);

		TR tr3 = new TR();
		TD td5 = new TD();
		td5.setColSpan(2);
		td5.setAlign("center");

		td5.addElement(new Input(Input.SUBMIT, "Submit", "Login"));
		tr3.addElement(td5);

		table.addElement(tr1);
		table.addElement(tr2);
		table.addElement(tr3);
		loginDiv.addElement(table);
		ec.addElement(loginDiv);
		
		H2 errorTag = new H2(errorMessage);
		errorTag.addAttribute("align", "center");
		errorTag.addAttribute("class", "info");
		ec.addElement(errorTag);

	}

	/**
	 * Create content after a successful login
	 * 
	 * @param s
	 * @param ec
	 */
	private void createSuccessfulLoginContent(WebSession s, ElementContainer ec)
	{
		String userDataStyle = "margin-top:50px;";

		Div userDataDiv = new Div();
		userDataDiv.setStyle(userDataStyle);
		userDataDiv.addAttribute("align", "center");
		Table table = new Table();
		table.addAttribute("cellspacing", 10);
		table.addAttribute("cellpadding", 5);

		table.addAttribute("align", "center");
		TR tr1 = new TR();
		TR tr2 = new TR();
		TR tr3 = new TR();
		TR tr4 = new TR();
		tr1.addElement(new TD("<b>Firstname:</b>"));
		tr1.addElement(new TD(getLoggedInUser(s)));

		try
		{
			ResultSet results = getUser(getLoggedInUser(s), s);
			results.first();

			tr2.addElement(new TD("<b>Lastname:</b>"));
			tr2.addElement(new TD(results.getString("last_name")));

			tr3.addElement(new TD("<b>Credit Card Type:</b>"));
			tr3.addElement(new TD(results.getString("cc_type")));

			tr4.addElement(new TD("<b>Credit Card Number:</b>"));
			tr4.addElement(new TD(results.getString("cc_number")));

		}

		catch (Exception e)
		{
			e.printStackTrace();
		}
		table.addElement(tr1);
		table.addElement(tr2);
		table.addElement(tr3);
		table.addElement(tr4);

		userDataDiv.addElement(table);
		ec.addElement(userDataDiv);
		ec.addElement(createLogoutLink());
		
	}

	/**
	 * Create a link for logging out
	 * 
	 * @return Element
	 */
	private Element createLogoutLink()
	{
		A logoutLink = new A();
		logoutLink.addAttribute("href", getLink() + "&logout=true");
		logoutLink.addElement("Logout");

		String logoutStyle = "margin-right:50px; mrgin-top:30px";
		Div logoutDiv = new Div();
		logoutDiv.addAttribute("align", "right");
		logoutDiv.addElement(logoutLink);
		logoutDiv.setStyle(logoutStyle);

		return logoutDiv;
	}

	/**
	 * Get a user by its name
	 * 
	 * @param user
	 * @param s
	 * @return ResultSet containing the user
	 */
	private ResultSet getUser(String user, WebSession s)
	{
		Connection connection = null;
		try
		{
			connection = DatabaseUtilities.getConnection(s);
			String query = "SELECT * FROM user_data_tan WHERE first_name = ? ";
			PreparedStatement prepStatement = connection.prepareStatement(query, ResultSet.TYPE_SCROLL_INSENSITIVE,
																			ResultSet.CONCUR_READ_ONLY);
			prepStatement.setString(1, user);

			ResultSet results = prepStatement.executeQuery();

			return results;

		} catch (Exception e)
		{
			e.printStackTrace();
		}
		finally
		{
			try
			{
				if (connection != null)
				{
					connection.close();
				}
			}
			catch (Exception e)
			{
				e.printStackTrace();
			}
		}
		return null;

	}

	/**
	 * Get the logged in user
	 * 
	 * @param s
	 * @return the logged in user
	 */
	private String getLoggedInUser(WebSession s)
	{
		try
		{
			String user = (String) s.get(LOGGEDINUSER);
			return user;
		} catch (Exception e)
		{
			return "";
		}
	}

	/**
	 * Get the category
	 * 
	 * @return the category
	 */
	protected Category getDefaultCategory()
	{
		return Category.SESSION_MANAGEMENT;
	}

	/**
	 * Gets the hints attribute of the RoleBasedAccessControl object
	 * 
	 * @return The hints value
	 */
	public List<String> getHints(WebSession s)
	{
		List<String> hints = new ArrayList<String>();

		hints.add("Stage 1: Where is the link in the mail?");
		hints.add("Stage 1: Add a SID to the link");
		hints.add("Stage 1: A SID could looke something like this: SID=Whatever");
		hints.add("Stage 1: Alter the link in the mail to: href=" + getLink() + "&SID=Whatever");
		hints.add("Stage 2: Click on the link!");
		hints.add("Stage 3: Log in as Jane with user name jane and password tarzan.");
		hints.add("Stage 4: Click on the link provided");
		hints.add("Stage 4: What is your actual SID?");
		hints.add("Stage 4: Change the SID (NOVALIDSESSION) to the choosen one in the mail");
		


		return hints;

	}

	/**
	 * Get the instructions for the user
	 */
	public String getInstructions(WebSession s)
	{
		int stage = getLessonTracker(s).getStage();
		if (stage > 4)
		{
			stage = 4;
		}
		String instructions = "STAGE " +stage+": ";
		if(stage == 1)
		{
			instructions += "You are Hacker Joe and " +
					"you want to steal the session from Jane. " +
					"That is why you have to send a prepared mail " +
					"which looks like an official mail from the bank" +
					"to her. The mail is already prepared. Only " +
					"thing missing is a Session ID (SID) in the Link. Alter " +
					"the link to include a SID.<br><br><b>You are: Hacker Joe</b>";
		}
		else if (stage == 2)
		{
			instructions += "Now you are the victim Jane who received the mail you see. " +
					"If you point on the link with your mouse you will see that there is a SID included." +
					"Click on it to see what happens.<br><br><b>You are: Victim Jane</b> ";
		}
		else if (stage == 3)
		{
			instructions += "As the bank kindly asked to verfy your data you have to log in to see if your details are "  +
					"correct ;). Your user name is <b>Jane</b> and your password is <b>tarzan</b>. <br><br><b>You are: Victim Jane</b> ";
		}
		else if (stage == 4)
		{
			instructions += "It is time to steal the session now. Use following link to reach Goat Hills " +
					"Financial.<br><br><b>You are: Hacker Joe</b> ";
		}


		return (instructions);
	}

	private final static Integer DEFAULT_RANKING = new Integer(222);

	/**
	 * Get the ranking for the hirarchy of lessons
	 */
	protected Integer getDefaultRanking()
	{
		return DEFAULT_RANKING;
	}

	/**
	 * Get the title of the Lesson
	 */
	public String getTitle()
	{
		return ("Session Fixation");
	}
	
	@Override
	public void handleRequest(WebSession s)
	{
		Form form = new Form();
		form.addElement(createContent(s));
		form.setAction(getFormAction());
		form.setMethod(Form.POST);
		form.setName("form");
		form.setEncType("");
		setContent(form);
	}
	
	@Override
	public String getLink()
	{
		
		if(sid.equals(""))
		{
			return super.getLink();
		}
		return super.getLink() + "&SID=" + sid;
	}
	

	private String randomSIDGenerator()
	{
		String sid = "";

		sid = String.valueOf(Math.abs(random.nextInt()%100000));
		return sid;
	}
	
	public Element getCredits()
	{
		return super.getCustomCredits("Created by: Reto Lippuner, Marcel Wirth", new StringElement(""));
	}

}