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What is it?

This shell-script fetches lists of tor-exit-node IP-addresses, parses and sanitizes them and applies it as an iptables IPv4/IPv6-ruleset, so they are blocked.

Setup

use hourly cronjob as user 'root' for regular updates:

6 * * * * /usr/local/bin/tornodes_block.sh update

Description

IP-lists are fetched from

'https://www.dan.me.uk/torlist/?exit' and
'https://check.torproject.org/cgi-bin/TorBulkExitList.py?ip=1.1.1.1'.

iptables replacement of new rules works nearly atomic.

Layout of iptables rules and logic

# send all incoming traffic to chain 'tor':
Chain INPUT (policy ACCEPT 11031 packets, 6043475 bytes)
    pkts      bytes target     prot opt in     out     source               destination
   11031  6043475 tor        all  --  *      *       0.0.0.0/0            0.0.0.0/0


# everything that matches gets REJECTED here:
Chain tor (1 references)
    pkts      bytes target     prot opt in     out     source               destination
       0        0 REJECT     all  --  *      *       103.15.28.215        0.0.0.0/0      reject-with icmp-port-unreachable
       5     4108 REJECT     all  --  *      *       103.208.220.122      0.0.0.0/0      reject-with icmp-port-unreachable
       0        0 REJECT     all  --  *      *       103.208.220.226      0.0.0.0/0      reject-with icmp-port-unreachable

[...]