Authentication check for admin website

[eluser]deed02392[/eluser]
Hi guys. I'm creating a web application where every single page load would require the user is authenticated. So far I have just been including an 'is_logged_in' check for every single method of all the controller classes but this seems like madness.

Is there somewhere in the framework which supports authenticating the user on a higher level, such that I can simply assume the user is authenticated if one of my controllers is loaded?

Thanks!