Filter system in 2.0?

[eluser]froginvasion[/eluser]
The authentication needs in our application are quite simple, using another framework for this would be overkill, since we don't need to assign attributes to roles. We just need a very simple system that restricts access by roles.

I thought, well this could be easily implemented using a filter, heck: it would even save me from fiddling in the controller, which is a nasty thing to do really. So when googling I stumbled upon:
http://codeigniter.com/wiki/Filters_system/

Does anybody know if this is still actively used, and does work in Code Ignite 2.0? I've used the wiki and set all the configuration settings, files, etc, but I don't seem to be able to get it to work.

Code:

class Auth_Filter extends Filter {
function before(){
redirect('login/index');
}
}

Code:

$filter['auth'] = array('include', array('*'), array());