[Zope-CMF] Members only CMF?

[Jonathan]

Hi all,

I want to use CMF 1.1 to build an intranet-type application, which 
has little use for publishing to anonymous users; all users have to 
be authenticated first to access content inside the application.

How easy/hard is it to adapt CMF to only cater to members? And 
owners, managers, and reviewers of course. As far as I understand the 
code, CMF borrows its access control from Zope itself, right? Is that 
the part I need to look at?

Thnx!
Jonathan