/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE643_Xpath_Injection__getQueryString_Servlet_42.java
Label Definition File: CWE643_Xpath_Injection.label.xml
Template File: sources-sinks-42.tmpl.java
*/
/*
 * @description
 * CWE: 643 Xpath Injection
 * BadSource: getQueryString_Servlet Parse id param out of the URL query string (without using getParameter())
 * GoodSource: A hardcoded string
 * Sinks:
 *    GoodSink: validate input through StringEscapeUtils
 *    BadSink : user input is used without validate
 * Flow Variant: 42 Data flow: data returned from one method to another in the same class
 *
 * */





import javax.servlet.http.*;

import java.util.StringTokenizer;

import javax.xml.xpath.*;

import org.xml.sax.InputSource;

import org.apache.commons.lang.StringEscapeUtils;

public class CWE643_Xpath_Injection__getQueryString_Servlet_42 extends AbstractTestCaseServlet
{
    private String badSource(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        data = ""; /* initialize data in case id is not in query string */

        /* POTENTIAL FLAW: Parse id param out of the URL querystring (without using getParameter()) */
        {
            StringTokenizer tokenizer = new StringTokenizer(request.getQueryString(), "&");
            while (tokenizer.hasMoreTokens())
            {
                String token = tokenizer.nextToken(); /* a token will be like "id=foo" */
                if(token.startsWith("id=")) /* check if we have the "id" parameter" */
                {
                    data = token.substring(3); /* set data to "foo" */
                    break; /* exit while loop */
                }
            }
        }

        return data;
    }

    public void bad(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data = badSource(request, response);

        String xmlFile = null;
        if(System.getProperty("os.name").toLowerCase().indexOf("win") >= 0)
        {
            /* running on Windows */
            xmlFile = "\\src\\testcases\\CWE643_Xpath Injection\\CWE643_Xpath_Injection__Helper.xml";
        }
        else
        {
            /* running on non-Windows */
            xmlFile = "./src/testcases/CWE643_Xpath Injection/CWE643_Xpath_Injection__Helper.xml";
        }

        if (data != null)
        {
            /* assume username||password as source */
            String [] tokens = data.split("||");
            if (tokens.length < 2)
            {
                return;
            }
            String username = tokens[0];
            String password = tokens[1];
            /* build xpath */
            XPath xPath = XPathFactory.newInstance().newXPath();
            InputSource inputXml = new InputSource(xmlFile);
            /* INCIDENTAL: CWE180 Incorrect Behavior Order: Validate Before Canonicalize
             *     The user input should be canonicalized before validation. */
            /* POTENTIAL FLAW: user input is used without validate */
            String query = "//users/user[name/text()='" + username +
                           "' and pass/text()='" + password + "']" +
                           "/secret/text()";
            String secret = (String)xPath.evaluate(query, inputXml, XPathConstants.STRING);
        }

    }

    /* goodG2B() - use goodsource and badsink */
    private String goodG2BSource(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        /* FIX: Use a hardcoded string */
        data = "foo";

        return data;
    }

    private void goodG2B(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data = goodG2BSource(request, response);

        String xmlFile = null;
        if(System.getProperty("os.name").toLowerCase().indexOf("win") >= 0)
        {
            /* running on Windows */
            xmlFile = "\\src\\testcases\\CWE643_Xpath Injection\\CWE643_Xpath_Injection__Helper.xml";
        }
        else
        {
            /* running on non-Windows */
            xmlFile = "./src/testcases/CWE643_Xpath Injection/CWE643_Xpath_Injection__Helper.xml";
        }

        if (data != null)
        {
            /* assume username||password as source */
            String [] tokens = data.split("||");
            if (tokens.length < 2)
            {
                return;
            }
            String username = tokens[0];
            String password = tokens[1];
            /* build xpath */
            XPath xPath = XPathFactory.newInstance().newXPath();
            InputSource inputXml = new InputSource(xmlFile);
            /* INCIDENTAL: CWE180 Incorrect Behavior Order: Validate Before Canonicalize
             *     The user input should be canonicalized before validation. */
            /* POTENTIAL FLAW: user input is used without validate */
            String query = "//users/user[name/text()='" + username +
                           "' and pass/text()='" + password + "']" +
                           "/secret/text()";
            String secret = (String)xPath.evaluate(query, inputXml, XPathConstants.STRING);
        }

    }

    /* goodB2G() - use badsource and goodsink */
    private String goodB2GSource(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        data = ""; /* initialize data in case id is not in query string */

        /* POTENTIAL FLAW: Parse id param out of the URL querystring (without using getParameter()) */
        {
            StringTokenizer tokenizer = new StringTokenizer(request.getQueryString(), "&");
            while (tokenizer.hasMoreTokens())
            {
                String token = tokenizer.nextToken(); /* a token will be like "id=foo" */
                if(token.startsWith("id=")) /* check if we have the "id" parameter" */
                {
                    data = token.substring(3); /* set data to "foo" */
                    break; /* exit while loop */
                }
            }
        }

        return data;
    }

    private void goodB2G(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data = goodB2GSource(request, response);

        String xmlFile = null;
        if(System.getProperty("os.name").toLowerCase().indexOf("win") >= 0)
        {
            /* running on Windows */
            xmlFile = "\\src\\testcases\\CWE643_Xpath Injection\\CWE643_Xpath_Injection__Helper.xml";
        }
        else
        {
            /* running on non-Windows */
            xmlFile = "./src/testcases/CWE643_Xpath Injection/CWE643_Xpath_Injection__Helper.xml";
        }

        if (data != null)
        {
            /* assume username||password as source */
            String [] tokens = data.split("||");
            if( tokens.length < 2 )
            {
                return;
            }
            /* FIX: validate input using StringEscapeUtils */
            String username = StringEscapeUtils.escapeXml(tokens[0]);
            String password = StringEscapeUtils.escapeXml(tokens[1]);
            /* build xpath */
            XPath xPath = XPathFactory.newInstance().newXPath();
            InputSource inputXml = new InputSource(xmlFile);
            String query = "//users/user[name/text()='" + username +
                           "' and pass/text()='" + password + "']" +
                           "/secret/text()";
            String secret = (String)xPath.evaluate(query, inputXml, XPathConstants.STRING);
        }

    }

    public void good(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        goodG2B(request, response);
        goodB2G(request, response);
    }

    /* Below is the main(). It is only used when building this testcase on
     * its own for testing or for building a binary to use in testing binary
     * analysis tools. It is not used when compiling all the testcases as one
     * application, which is how source code analysis tools are tested.
     */
    public static void main(String[] args) throws ClassNotFoundException,
           InstantiationException, IllegalAccessException
    {
        mainFromParent(args);
    }
}
