dialogsecuritywrapper.java

First of all, the Applet-phone is a SIP User-Agent with audio and text messaging capabilities. But

/*
 * SecurityWrapperTest.java
 *
 * Created on June 17, 2003, 9:09 AM
 */

package gov.nist.security.bcs.wrapper;

import java.util.*;

import javax.sip.message.*;
import javax.sip.header.*;


/**
 * Class that will be called from the bytecode. Each method will do a particular check
 * @author  DERUELLE Jean
 */
public class DialogSecurityWrapper { 
    /**list keeping all the active dialogs of the service*/
    Hashtable dialogList=null;
    /** Creates a new instance of SecurityWrapper */
    public DialogSecurityWrapper() {
        dialogList=new Hashtable();
    }
    
    
    /** A method to check if the service tries to fork too much.
     * @param request - the request from which the service create the dialog
     */    
    public void checkDialog(Request request){
        //Get the caller address from the request
        String caller=(request.getHeader(FromHeader.NAME)).toString();
        int indexOpeningParenthesisCaller=caller.indexOf("<");
        int indexClosingParenthesisCaller=caller.indexOf(">"); 
        caller=caller.substring(indexOpeningParenthesisCaller+1,indexClosingParenthesisCaller);               
        caller=caller.substring("sip:".length());        
        //Get the callee address from the request
        //String callee=(request.getHeader(ToHeader.NAME)).toString();
        javax.sip.address.URI calleeURI=request.getRequestURI();        
        String callee=calleeURI.toString();
        //int indexOpeningParenthesisCallee=callee.indexOf("<");
        //int indexClosingParenthesisCallee=callee.indexOf(">"); 
        //callee=callee.substring(indexOpeningParenthesisCallee+1,indexClosingParenthesisCallee);       
        callee=callee.substring("sip:".length());        
        //System.out.println(callee);   
        //System.out.println(caller);           
        Object correspondingCallee=dialogList.get(caller); 
        ForkAssociation fork=(ForkAssociation)correspondingCallee;
        if(correspondingCallee==null){            
            fork=new ForkAssociation(callee);
            dialogList.put(caller,fork);
        }
        else{
            if(!fork.findCallee(callee))
                fork.addFork(callee);
        }
        String numberOfForking=Integer.toString(fork.getNumberOfFork());
        
        try{
            java.security.AccessControlContext context=null;
            SecurityManager securityManager=System.getSecurityManager();
            if (securityManager != null) 
                context = (java.security.AccessControlContext) securityManager.getSecurityContext();          

            gov.nist.security.permissions.SipDialogPermission sipDialogPermission=new gov.nist.security.permissions.SipDialogPermission(numberOfForking,"create");
            //System.out.println("Checking in your group policy file for the following DIALOG PERMISSION : "+ sipDialogPermission);
            context.checkPermission(sipDialogPermission);  
            //System.out.println("Dialog created");               
        }
        catch(Exception e){
            //e.printStackTrace();
            System.out.println("You have already created "+ numberOfForking + " dialog(s), you cannot do more.");   
            
            System.exit(1);
        }
        //return true;        
    }
    
}