Is there a good application firewall for Linux. I want to limit which applications can access the Internet. If it works well with Plasma, that’s a plus.
I am using opensnitch.
I’m investigating that now. Thanks.
Firejail is also able to restrict per-application network access bluntly, alongside sand-boxing the application. Not fine grained like a firewall may be, but a simple “no net for you” style configuration option per-application, if that’s what you’re after.
The downside is Firejail can often be overly effective at locking down applications, requiring some configuration to get it behaving as needed.
I think AppArmor is worth a look, too. https://wiki.archlinux.org/title/AppArmor
Well that was simple and seems to be effective.
One piece of advice is change the default to be permanent. Otherwise you have to change it constantly.
When you first start using it, you are going to get a whole bunch or prompts to work through.
Yeah, you’re not kidding. It’s amazing how many things access the Internet.
…depending on what exactly you’re looking for, note that Little Snitch (a popular macOS app) is now also available for Linux: https://obdev.at/products/littlesnitch-linux/index.html