I have a squid proxy on my Debian-Gnu-Linux-laptop configured to block some web sites. I can set a browser to use this proxy, but I can also configure it to not use it. As I am using it to block some sites. I do not wish an application to be able to bypass the proxy. Is it possible to configure a fire wall to black outgoing traffic except if sent by the proxy application or user?
I would like a simple configurator if possible.
Note: I am using a single machine.