/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE89_SQL_Injection__getQueryString_Servlet_executeQuery_42.java
Label Definition File: CWE89_SQL_Injection.label.xml
Template File: sources-sinks-42.tmpl.java
*/
/*
 * @description
 * CWE: 89 SQL Injection
 * BadSource: getQueryString_Servlet Parse id param out of the URL query string (without using getParameter())
 * GoodSource: A hardcoded string
 * Sinks: executeQuery
 *    GoodSink: Use prepared statement and executeQuery (properly)
 *    BadSink : data concatenated into SQL statement used in executeQuery(), which could result in SQL Injection
 * 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 java.sql.*;

import java.util.logging.Level;

public class CWE89_SQL_Injection__getQueryString_Servlet_executeQuery_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);

        Connection dbConnection = null;
        Statement sqlStatement = null;
        ResultSet resultSet = null;

        try
        {
            dbConnection = IO.getDBConnection();
            sqlStatement = dbConnection.createStatement();

            /* POTENTIAL FLAW: data concatenated into SQL statement used in executeQuery(), which could result in SQL Injection */
            resultSet = sqlStatement.executeQuery("select * from users where name='"+data+"'");

            IO.writeLine(resultSet.getRow()); /* Use ResultSet in some way */
        }
        catch (SQLException exceptSql)
        {
            IO.logger.log(Level.WARNING, "Error getting database connection", exceptSql);
        }
        finally
        {
            try
            {
                if (resultSet != null)
                {
                    resultSet.close();
                }
            }
            catch (SQLException exceptSql)
            {
                IO.logger.log(Level.WARNING, "Error closing ResultSet", exceptSql);
            }

            try
            {
                if (sqlStatement != null)
                {
                    sqlStatement.close();
                }
            }
            catch (SQLException exceptSql)
            {
                IO.logger.log(Level.WARNING, "Error closing Statement", exceptSql);
            }

            try
            {
                if (dbConnection != null)
                {
                    dbConnection.close();
                }
            }
            catch (SQLException exceptSql)
            {
                IO.logger.log(Level.WARNING, "Error closing Connection", exceptSql);
            }
        }

    }

    /* 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);

        Connection dbConnection = null;
        Statement sqlStatement = null;
        ResultSet resultSet = null;

        try
        {
            dbConnection = IO.getDBConnection();
            sqlStatement = dbConnection.createStatement();

            /* POTENTIAL FLAW: data concatenated into SQL statement used in executeQuery(), which could result in SQL Injection */
            resultSet = sqlStatement.executeQuery("select * from users where name='"+data+"'");

            IO.writeLine(resultSet.getRow()); /* Use ResultSet in some way */
        }
        catch (SQLException exceptSql)
        {
            IO.logger.log(Level.WARNING, "Error getting database connection", exceptSql);
        }
        finally
        {
            try
            {
                if (resultSet != null)
                {
                    resultSet.close();
                }
            }
            catch (SQLException exceptSql)
            {
                IO.logger.log(Level.WARNING, "Error closing ResultSet", exceptSql);
            }

            try
            {
                if (sqlStatement != null)
                {
                    sqlStatement.close();
                }
            }
            catch (SQLException exceptSql)
            {
                IO.logger.log(Level.WARNING, "Error closing Statement", exceptSql);
            }

            try
            {
                if (dbConnection != null)
                {
                    dbConnection.close();
                }
            }
            catch (SQLException exceptSql)
            {
                IO.logger.log(Level.WARNING, "Error closing Connection", exceptSql);
            }
        }

    }

    /* 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);

        Connection dbConnection = null;
        PreparedStatement sqlStatement = null;
        ResultSet resultSet = null;

        try
        {
            /* FIX: Use prepared statement and executeQuery (properly) */
            dbConnection = IO.getDBConnection();
            sqlStatement = dbConnection.prepareStatement("select * from users where name=?");
            sqlStatement.setString(1, data);

            resultSet = sqlStatement.executeQuery();

            IO.writeLine(resultSet.getRow()); /* Use ResultSet in some way */
        }
        catch (SQLException exceptSql)
        {
            IO.logger.log(Level.WARNING, "Error getting database connection", exceptSql);
        }
        finally
        {
            try
            {
                if (resultSet != null)
                {
                    resultSet.close();
                }
            }
            catch (SQLException exceptSql)
            {
                IO.logger.log(Level.WARNING, "Error closing ResultSet", exceptSql);
            }

            try
            {
                if (sqlStatement != null)
                {
                    sqlStatement.close();
                }
            }
            catch (SQLException exceptSql)
            {
                IO.logger.log(Level.WARNING, "Error closing PreparedStatement", exceptSql);
            }

            try
            {
                if (dbConnection != null)
                {
                    dbConnection.close();
                }
            }
            catch (SQLException exceptSql)
            {
                IO.logger.log(Level.WARNING, "Error closing Connection", exceptSql);
            }
        }

    }

    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);
    }
}
