Test if a socket accept is from external network

Jeffrey Walton noloader at gmail.com
Sun Apr 25 08:01:55 EDT 2021

On Sun, Apr 25, 2021 at 7:09 AM John Wood <john.wood at 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.


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