Add fail2ban-server as trusted binary

fail2ban spawns shells to modify iptables

falco-CLA-1.0-signed-off-by: Jonathan Coetzee <[email protected]>

rules/falco_rules.yaml

@@ -282,7 +282,7 @@
 
 - rule: Run shell untrusted
   desc: an attempt to spawn a shell by a non-shell program. Exceptions are made for trusted binaries.
-  condition: spawned_process and not container and shell_procs and proc.pname exists and not proc.pname in (cron_binaries, shell_binaries, sshd, sudo, docker_binaries, k8s_binaries, su, tmux, screen, emacs, systemd, login, flock, fbash, nginx, monit, supervisord, dragent, aws, initdb, docker-compose, make, configure, awk, falco)
+  condition: spawned_process and not container and shell_procs and proc.pname exists and not proc.pname in (cron_binaries, shell_binaries, sshd, sudo, docker_binaries, k8s_binaries, su, tmux, screen, emacs, systemd, login, flock, fbash, nginx, monit, supervisord, dragent, aws, initdb, docker-compose, make, configure, awk, falco, fail2ban-server)
   output: "Shell spawned by untrusted binary (user=%user.name shell=%proc.name parent=%proc.pname cmdline=%proc.cmdline)"
   priority: WARNING