cron jobs

Hi,
I'm trying to get working a cron job invoked from a web url eg.
example.com/cron.php

Actually I've:
- cloned the webroot/index.php
- initialized Dispatcher with no args
- looped all controller files in controller/*
- App.imported them, $controller->constructClasses,
$controller->startupProcess() (miming the dispatcher work)
- nulled layout
- called $controller->cron method, if exitsts
- die(0) at the end

the missing thing is the Auth check for some controller that kick me to
the login page.. breaking the game :(
Is there a "sudo" way to do this?
(I was thinking to login a virtual user with all permissions, created
on the fly.. but how..)

Thanks in advance,
Luca

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