/usr/src/xtables-addons-1.40/pknock/xt_pknock.Kconfig is in xtables-addons-dkms 1.40-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | config NETFILTER_XT_MATCH_PKNOCK
tristate "Port knocking match support"
depends on NETFILTER_XTABLES && CONNECTOR
---help---
pknock match implements so-called Port Knocking, a stealthy system
for network authentication: client sends packets to selected, closed
ports on target machine in a specific sequence. The target machine
(which has pknock match rule set up) then decides whether to
unblock or block (again) its protected port with listening
service. This can be, for instance, used to avoid brute force attacks
on ssh or ftp services.
For more informations go to: http://portknocko.berlios.de/
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