Squid - Help on proxy authentication

[vulcassio]

Hello.

I set up my squid to ask for authentication when using proxy. Its working fine.  But I want each authenticated user to have different access permitions.
Like this:

user 'admin' has access to everything
user 'general' has access to whitelist, deny all the rest.

Anyone mind helping me doing this?

Thanks :)

[vulcassio]

Anyone?