/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE113_HTTP_Response_Splitting__Property_addCookieServlet_21.java
Label Definition File: CWE113_HTTP_Response_Splitting.label.xml
Template File: sources-sinks-21.tmpl.java
*/
/*
 * @description
 * CWE: 113 HTTP Response Splitting
 * BadSource: Property Read data from a system property
 * GoodSource: A hardcoded string
 * Sinks: addCookieServlet
 *    GoodSink: URLEncode input
 *    BadSink : querystring to addCookie()
 * Flow Variant: 21 Control flow: Flow controlled by value of a private variable. All functions contained in one file.
 *
 * */




import javax.servlet.http.*;

import java.net.URLEncoder;

public class CWE113_HTTP_Response_Splitting__Property_addCookieServlet_21 extends AbstractTestCaseServlet
{
    /* The variable below is used to drive control flow in the sink function */
    private boolean badPrivate = false;

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

        /* get system property user.home */
        /* POTENTIAL FLAW: Read data from a system property */
        data = System.getProperty("user.home");

        badPrivate = true;
        badSink(data , request, response);
    }

    private void badSink(String data , HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        if (badPrivate)
        {
            if (data != null)
            {
                Cookie cookieSink = new Cookie("lang", data);
                /* POTENTIAL FLAW: Input not verified before inclusion in the cookie */
                response.addCookie(cookieSink);
            }
        }
    }

    /* The variables below are used to drive control flow in the sink functions. */
    private boolean goodB2G1Private = false;
    private boolean goodB2G2Private = false;
    private boolean goodG2BPrivate = false;

    public void good(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        goodB2G1(request, response);
        goodB2G2(request, response);
        goodG2B(request, response);
    }

    /* goodB2G1() - use BadSource and GoodSink by setting the variable to false instead of true */
    private void goodB2G1(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        /* get system property user.home */
        /* POTENTIAL FLAW: Read data from a system property */
        data = System.getProperty("user.home");

        goodB2G1Private = false;
        goodB2G1Sink(data , request, response);
    }

    private void goodB2G1Sink(String data , HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        if (goodB2G1Private)
        {
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
            IO.writeLine("Benign, fixed string");
        }
        else
        {

            if (data != null)
            {
                Cookie cookieSink = new Cookie("lang", URLEncoder.encode(data, "UTF-8"));
                /* FIX: use URLEncoder.encode to hex-encode non-alphanumerics */
                response.addCookie(cookieSink);
            }

        }
    }

    /* goodB2G2() - use BadSource and GoodSink by reversing the blocks in the if in the sink function */
    private void goodB2G2(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

        /* get system property user.home */
        /* POTENTIAL FLAW: Read data from a system property */
        data = System.getProperty("user.home");

        goodB2G2Private = true;
        goodB2G2Sink(data , request, response);
    }

    private void goodB2G2Sink(String data , HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        if (goodB2G2Private)
        {
            if (data != null)
            {
                Cookie cookieSink = new Cookie("lang", URLEncoder.encode(data, "UTF-8"));
                /* FIX: use URLEncoder.encode to hex-encode non-alphanumerics */
                response.addCookie(cookieSink);
            }
        }
    }

    /* goodG2B() - use GoodSource and BadSink */
    private void goodG2B(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        String data;

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

        goodG2BPrivate = true;
        goodG2BSink(data , request, response);
    }

    private void goodG2BSink(String data , HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        if (goodG2BPrivate)
        {
            if (data != null)
            {
                Cookie cookieSink = new Cookie("lang", data);
                /* POTENTIAL FLAW: Input not verified before inclusion in the cookie */
                response.addCookie(cookieSink);
            }
        }
    }

    /* 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);
    }
}
