Admins eHow

April 27, 2011

Block BitTorrent traffic on your Linux firewall using iptables

Filed under: Debian,linux,Security — Tags: , , , , , — admin @ 7:25 pm

The following script will block and log un-encrypted BitTorrent & DHT traffic on your Linux firewall.
I have personally tested it on debian 5 lenny , but I am almost sure it should work pretty well on any new Linux distros.

iptables -N LOGDROP > /dev/null 2> /dev/null 
iptables -F LOGDROP 
iptables -A LOGDROP -j LOG --log-prefix "LOGDROP " 
iptables -A LOGDROP -j DROP

#Torrent
iptables -A FORWARD -m string --algo bm --string "BitTorrent" -j LOGDROP 
iptables -A FORWARD -m string --algo bm --string "BitTorrent protocol" -j LOGDROP
iptables -A FORWARD -m string --algo bm --string "peer_id=" -j LOGDROP
iptables -A FORWARD -m string --algo bm --string ".torrent" -j LOGDROP
iptables -A FORWARD -m string --algo bm --string "announce.php?passkey=" -j LOGDROP 
iptables -A FORWARD -m string --algo bm --string "torrent" -j LOGDROP
iptables -A FORWARD -m string --algo bm --string "announce" -j LOGDROP
iptables -A FORWARD -m string --algo bm --string "info_hash" -j LOGDROP 

# DHT keyword
iptables -A FORWARD -m string --string "get_peers" --algo bm -j LOGDROP
iptables -A FORWARD -m string --string "announce_peer" --algo bm -j LOGDROP
iptables -A FORWARD -m string --string "find_node" --algo bm -j LOGDROP

Powered by WordPress