/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE113_HTTP_Response_Splitting__File_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: File Read data from file (named c:\data.txt)
 * 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.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.FileInputStream;
import java.io.File;
import java.io.IOException;

import java.util.logging.Level;

import java.net.URLEncoder;

public class CWE113_HTTP_Response_Splitting__File_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;

        data = ""; /* Initialize data */
        {
            File file = new File("C:\\data.txt");
            FileInputStream streamFileInput = null;
            InputStreamReader readerInputStream = null;
            BufferedReader readerBuffered = null;

            try
            {
                /* read string from file into data */
                streamFileInput = new FileInputStream(file);
                readerInputStream = new InputStreamReader(streamFileInput, "UTF-8");
                readerBuffered = new BufferedReader(readerInputStream);

                /* POTENTIAL FLAW: Read data from a file */
                /* This will be reading the first "line" of the file, which
                 * could be very long if there are little or no newlines in the file */
                data = readerBuffered.readLine();
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error with stream reading", exceptIO);
            }
            finally
            {
                /* Close stream reading objects */
                try
                {
                    if (readerBuffered != null)
                    {
                        readerBuffered.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing BufferedReader", exceptIO);
                }

                try
                {
                    if (readerInputStream != null)
                    {
                        readerInputStream.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing InputStreamReader", exceptIO);
                }

                try
                {
                    if (streamFileInput != null)
                    {
                        streamFileInput.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing FileInputStream", exceptIO);
                }
            }
        }

        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;

        data = ""; /* Initialize data */
        {
            File file = new File("C:\\data.txt");
            FileInputStream streamFileInput = null;
            InputStreamReader readerInputStream = null;
            BufferedReader readerBuffered = null;

            try
            {
                /* read string from file into data */
                streamFileInput = new FileInputStream(file);
                readerInputStream = new InputStreamReader(streamFileInput, "UTF-8");
                readerBuffered = new BufferedReader(readerInputStream);

                /* POTENTIAL FLAW: Read data from a file */
                /* This will be reading the first "line" of the file, which
                 * could be very long if there are little or no newlines in the file */
                data = readerBuffered.readLine();
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error with stream reading", exceptIO);
            }
            finally
            {
                /* Close stream reading objects */
                try
                {
                    if (readerBuffered != null)
                    {
                        readerBuffered.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing BufferedReader", exceptIO);
                }

                try
                {
                    if (readerInputStream != null)
                    {
                        readerInputStream.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing InputStreamReader", exceptIO);
                }

                try
                {
                    if (streamFileInput != null)
                    {
                        streamFileInput.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing FileInputStream", exceptIO);
                }
            }
        }

        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;

        data = ""; /* Initialize data */
        {
            File file = new File("C:\\data.txt");
            FileInputStream streamFileInput = null;
            InputStreamReader readerInputStream = null;
            BufferedReader readerBuffered = null;

            try
            {
                /* read string from file into data */
                streamFileInput = new FileInputStream(file);
                readerInputStream = new InputStreamReader(streamFileInput, "UTF-8");
                readerBuffered = new BufferedReader(readerInputStream);

                /* POTENTIAL FLAW: Read data from a file */
                /* This will be reading the first "line" of the file, which
                 * could be very long if there are little or no newlines in the file */
                data = readerBuffered.readLine();
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error with stream reading", exceptIO);
            }
            finally
            {
                /* Close stream reading objects */
                try
                {
                    if (readerBuffered != null)
                    {
                        readerBuffered.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing BufferedReader", exceptIO);
                }

                try
                {
                    if (readerInputStream != null)
                    {
                        readerInputStream.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing InputStreamReader", exceptIO);
                }

                try
                {
                    if (streamFileInput != null)
                    {
                        streamFileInput.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing FileInputStream", exceptIO);
                }
            }
        }

        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);
    }
}
