1.0 KiB
1.0 KiB
iblock
iblock is an inetd program adding the client IP to a Packet Filter table.
It is meant to be used to block scanner connecting on unused ports.
How to use
Start inetd service with this in /etc/inetd.conf:
666 stream tcp nowait root /usr/local/bin/iblock iblock
Use this in /etc/pf.conf, choose which ports will trigger the ban from the variable:
# services triggering a block
blocking_tcp="{ 21 23 53 111 135 137:139 445 1433 25565 5432 3389 3306 27019 }"
table <blocked> persist
pass in quick on egress proto tcp to port $blocking_tcp rdr-to 127.0.0.1 port 666
block in quick from <blocked> label iblock
Done! You can see IP banned using pfctl -t blocked -T show and iBlock will log blocking too.
In the example I added a label to the block rule, you can use pfctl -s labels to view statistics from this rule, see documentation for column meaning.
TODO
- make install doing something
- A proper man page
- Support IPv6
- make it work with doas
- pf table as a parameter