package org.owasp.webgoat.lessons;

import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import org.apache.ecs.Element;
import org.apache.ecs.ElementContainer;
import org.apache.ecs.StringElement;
import org.apache.ecs.html.BR;
import org.apache.ecs.html.H1;
import org.apache.ecs.html.IMG;
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.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 Sherif Koussa <a href="http://www.macadamian.com">Macadamian Technologies.</a>
 * @created October 28, 2006
 */

public class DOMInjection extends LessonAdapter
{

	private final static Integer DEFAULT_RANKING = new Integer(10);

	private final static String KEY = "key";

	private final static IMG MAC_LOGO = new IMG("images/logos/macadamian.gif").setAlt("Macadamian Technologies")
			.setBorder(0).setHspace(0).setVspace(0);

	protected Element createContent(WebSession s)
	{

		String key = "K1JFWP8BSO8HI52LNPQS8F5L01N";
		ElementContainer ec = new ElementContainer();

		try
		{
			String userKey = s.getParser().getRawParameter(KEY, "");
			String fromAJAX = s.getParser().getRawParameter("from", "");
			if (fromAJAX.equalsIgnoreCase("ajax") && userKey.length() != 0 && userKey.equals(key))
			{
				s.getResponse().setContentType("text/html");
				s.getResponse().setHeader("Cache-Control", "no-cache");
				PrintWriter out = new PrintWriter(s.getResponse().getOutputStream());
				out.print("document.forms[0].SUBMIT.disabled = false;");
				out.flush();
				out.close();
				return ec;
			}
			if (s.getRequest().getMethod().equalsIgnoreCase("POST"))
			{
				makeSuccess(s);
			}
		} catch (Exception e)
		{
			s.setMessage("Error generating " + this.getClass().getName());
			e.printStackTrace();
		}

		String lineSep = System.getProperty("line.separator");
		String script = "<script>" + lineSep + "function validate() {" + lineSep
				+ "var keyField = document.getElementById('key');" + lineSep + "var url = '" + getLink()
				+ "&from=ajax&key=' + encodeURIComponent(keyField.value);" + lineSep
				+ "if (typeof XMLHttpRequest != 'undefined') {" + lineSep + "req = new XMLHttpRequest();" + lineSep
				+ "} else if (window.ActiveXObject) {" + lineSep + "req = new ActiveXObject('Microsoft.XMLHTTP');"
				+ lineSep + "   }" + lineSep + "   req.open('GET', url, true);" + lineSep
				+ "   req.onreadystatechange = callback;" + lineSep + "   req.send(null);" + lineSep + "}" + lineSep
				+ "function callback() {" + lineSep + "    if (req.readyState == 4) { " + lineSep
				+ "        if (req.status == 200) { " + lineSep + "            var message = req.responseText;"
				+ lineSep + "			 eval(message);" + lineSep + "        }}}" + lineSep + "</script>" + lineSep;

		ec.addElement(new StringElement(script));
		ec.addElement(new BR().addElement(new H1().addElement("Welcome to WebGoat Registration Page:")));
		ec.addElement(new BR()
				.addElement("Please enter the license key that was emailed to you to start using the application."));
		ec.addElement(new BR());
		ec.addElement(new BR());
		Table t1 = new Table().setCellSpacing(0).setCellPadding(0).setBorder(0).setWidth("70%").setAlign("center");

		TR tr = new TR();
		tr.addElement(new TD(new StringElement("License Key: ")));

		Input input1 = new Input(Input.TEXT, KEY, "");
		input1.addAttribute("onkeyup", "validate();");
		tr.addElement(new TD(input1));
		t1.addElement(tr);

		tr = new TR();
		tr.addElement(new TD("&nbsp;").setColSpan(2));

		t1.addElement(tr);

		tr = new TR();
		Input b = new Input();
		b.setType(Input.SUBMIT);
		b.setValue("Activate!");
		b.setName("SUBMIT");
		b.setDisabled(true);
		tr.addElement(new TD("&nbsp;"));
		tr.addElement(new TD(b));

		t1.addElement(tr);
		ec.addElement(t1);

		return ec;
	}

	public Element getCredits()
	{
		return super.getCustomCredits("Created by Sherif Koussa ", MAC_LOGO);
	}

	protected Category getDefaultCategory()
	{

		return Category.AJAX_SECURITY;
	}

	protected Integer getDefaultRanking()
	{

		return DEFAULT_RANKING;
	}

	protected List<String> getHints(WebSession s)
	{

		List<String> hints = new ArrayList<String>();
		hints.add("This page is using XMLHTTP to comunicate with the server.");
		hints.add("Try to find a way to inject the DOM to enable the Activate button.");
		hints.add("Intercept the reply and replace the body with document.forms[0].SUBMIT.disabled = false;");
		return hints;
	}

	public String getTitle()
	{
		return "DOM Injection";
	}

}