Using Squid/Squidguard as a whitelist proxy
Is there a way to use squid/squidguard as a complete internet filter?
I am trying to set it up that only a list of approved sites would get through.
I know you can whitelist domains to get through but is it possible to only allow selected sites through, and block the rest?
Yes, you can do that.
If you're a Gold Subscriber we did a video presentation on Squid, Squidguard, and Lightsquid last Friday and it was mentioned how to set that up. It should be up for download soon.
SquidGuard can be set to "deny" by default, add in your own whitelist on top of that and it does what you're wanting. Though it'll be more work than you might initially suspect.