I've come back to Linux/Slack after quite a while away using Mac systems. One thing I've become accustomed to is the program "Little Snitch", which is basically an application-level outbound traffic firewall. So if I install some application and it wants to connect out somewhere, Little Snitch pops up a window and asks me if I want to allow that connection or not (and you can set rules based on domains, ports, timeframes, etc). My understanding is that iptables works on a lower level than this, and I've not had any luck finding something comparable to Little Snitch on Linux.

I'm guessing there's no nice GUI app for this, but how would one go about blacklisting applications from connecting to the network in general, and then whitelisting whatever is necessary? Is there anything more straightforward than going full SELinux/AppArmor?

Hi there, a quick search leads here : https://en.wikipedia.org/wiki/Applic...firewall#Linux

And i recall hearing good things for RSBAC (https://www.rsbac.org/) but i'm not sure if it requires kernel patching or not...

Although iptables is the defacto in Slackware, other userspace tools have gone by the wayside as of recent. One application similiar to what you need is called FireStarter. It's a userspace firewall tool that's horribly out of date, but it's close to what you desire, however, I would recommend against using it.

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