Thread:Extension talk:Lockdown/Locking everything down completely except reading the Main Namespace

I need some help.

I'd like to lockdown the wiki completely and operate as an internal private wiki, but have the main namespace readable by anyone.

That also means locking down access to view file history, special pages, etc..

Is Lockdown the way to do this.. if so how? And are there any security flaws? I know Mediawiki says it's not designed to be a CMS, but if the only thing outside users can do is read the main namespace, then where are the holes?

Thanks,