Protecting access to field, does exist?

Hi!
I am developing my first CakePHP base software, and as i`m very
interesting in building robust applications i mist one thing that i
could`t find anything in anywhere, and someone may know.
Well, what i could`t find in CakePHP, is a way to Protect fields from
others Model.
Eg.:
If you find('all') in a User, you may get it`s friends list, it`s
friend (user) and their password too. And you will get also, all data,
that you don`t wan`t to show people. Like in a XML, or web service...
As my system will have a LOT of XML to interact with others services,
i would like to know, if theres is an component, or if already is
something integrated with cakePHP, to protect things, and make the
system only find, what i let them find, and not everything...
Thanks!
Ivan

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