You can extend SeamExtendedManagedPersistencePhaseListener  or 
SeamPhaseListener depending which one you are using.

You can do something like this:
                   if(event.getPhaseId()==PhaseId.RENDER_RESPONSE)
                   {
                       boolean isLoggedIn = 
Contexts.getSessionContext().get("loggedInUser")!=null;
                       if(!isLoggedIn)
                       {
                           FacesContext fc = event.getFacesContext();
                           ViewHandler vh  = 
fc.getApplication().getViewHandler();
                           UIViewRoot newRoot = vh.createView(fc, LOGIN_PAGE);
                           fc.setViewRoot(newRoot);
                                                           
                       }
                       else
                       {
                                // verify authorization
                                        check permission here, set 
isValidPermission.
                                        
                                        if(!isValidPermission)
                                        {
                                                FacesContext fc = 
event.getFacesContext();
                                                ViewHandler vh  = 
fc.getApplication().getViewHandler();
                                                UIViewRoot newRoot = 
vh.createView(fc, AUTHORIZATION_ERROR_PAGE);
                                                fc.setViewRoot(newRoot);
                                        }
                       }
                   }

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