Hi, On Sun, Apr 25, 2021 at 08:01:55AM -0400, Jeffrey Walton wrote:
On Sun, Apr 25, 2021 at 7:09 AM John Wood <john.wood@gmx.com> wrote:
I'm working in a LSM to detect and mitigate fork brute force attacks against vulnerable userspace applications. Now, to fine tuning the detection I want to detect a network activity. ... How can I detect that an external connection (using a net device) is accepted and avoid internal network communication?
One caveat that may (or may not) apply...
Systemd opens sockets for services even when a service is disabled. It could appear that a system is accepting traffic even when the service is unavailable.
But if the service is unavailable it will not accept connections. I hope. If we use the socket_accept LSM hook it will not be called under this scenario. John Wood