[Mediawiki-l] Completly hide login/logout pages and links

[GF]

Hello,
I have a custom AuthPlugin that authenticate the user with some cookies set
from an external web application.
The login/logout on the mediawiki platform will make no sense in this
context and so I would like to completly remove the links to the
login/logout forms.

I have found how to hide wiki page to non-autenticate users, but on the page
in which it says the user can't see the content, mediawiki places a link to
the login form.
I have found also how not to display the user registration form... but still
I have not found any way to disable this login/logout stuff.

Thank you very much for any help.