Hi Guys,
I am running a VPN server but need to block illegal torrent downloads. The VPN plugin is provided by safesrv.net I have had updated Iptables prepared but I am interested in feedback from anyone who has experience with this.
Our updated iptables are below:
iptables -I INPUT -p udp --dport 1024:1193 -j DROP iptables -I INPUT -p udp --dport 1195:1644 -j DROP iptables -I INPUT -p udp --dport 1647:65534 -j ACCEPT
Allowing all neede ports for OpenVPN L2TP PPTP and RADIUS
iptables -I OUTPUT -p udp --dport 1812 -j ACCEPT iptables -I OUTPUT -p udp --dport 1813 -j ACCEPT iptables -I OUTPUT -p udp --dport 1701 -j ACCEPT iptables -I OUTPUT -p udp --dport 4500 -j ACCEPT iptables -I OUTPUT -p udp --dport 500 -j ACCEPT iptables -I OUTPUT -p udp --dport 443 -j ACCEPT iptables -I OUTPUT -p tcp --dport 1723 -j ACCEPT
Drop torrents
iptables -A OUTPUT -p tcp --dport 6881:6889 -j DROP iptables -A OUTPUT -p udp --dport 1024:65534 -j DROP
Set more radius (alt) ports
iptables -I OUTPUT -p udp --dport 1645 -j ACCEPT iptables -I OUTPUT -p udp --dport 1646 -j ACCEPT
Try torrent name filters
iptables -A FORWARD -m string --algo bm --string “BitTorrent” -j DROP
Trying forward
iptables -A FORWARD -p tcp --dport 6881:6889 -j DROP iptables -A FORWARD -p udp --dport 1024:65534 -j DROP
Found on web
iptables -N LOGDROP > /dev/null 2> /dev/null iptables -F LOGDROP iptables -A LOGDROP -j DROP
#Torrent iptables -D FORWARD -m string --algo bm --string “BitTorrent” -j LOGDROP iptables -D FORWARD -m string --algo bm --string “BitTorrent protocol” -j LOGDROP iptables -D FORWARD -m string --algo bm --string “peer_id=” -j LOGDROP iptables -D FORWARD -m string --algo bm --string “.torrent” -j LOGDROP iptables -D FORWARD -m string --algo bm --string “announce.php?passkey=” -j LOGDROP iptables -D FORWARD -m string --algo bm --string “torrent” -j LOGDROP iptables -D FORWARD -m string --algo bm --string “announce” -j LOGDROP iptables -D FORWARD -m string --algo bm --string “info_hash” -j LOGDROP
DHT keyword
iptables -A FORWARD -m string --string “get_peers” --algo bm -j DROP iptables -A FORWARD -m string --string “announce_peer” --algo bm -j LOGDROP iptables -A FORWARD -m string --string “find_node” --algo bm -j LOGDROP
Modified debia commands
iptables -A FORWARD -p udp -m string --algo bm --string “BitTorrent” -j DROP iptables -A FORWARD -p udp -m string --algo bm --string “BitTorrent protocol” -j DROP iptables -A FORWARD -p udp -m string --algo bm --string “peer_id=” -j DROP iptables -A FORWARD -p udp -m string --algo bm --string “.torrent” -j DROP iptables -A FORWARD -p udp -m string --algo bm --string “announce.php?passkey=” -j DROP iptables -A FORWARD -p udp -m string --algo bm --string “torrent” -j DROP iptables -A FORWARD -p udp -m string --algo bm --string “announce” -j DROP iptables -A FORWARD -p udp -m string --algo bm --string “info_hash” -j DROP iptables -A FORWARD -p udp -m string --algo bm --string “tracker” -j DROP
iptables -A INPUT -p udp -m string --algo bm --string “BitTorrent” -j DROP iptables -A INPUT -p udp -m string --algo bm --string “BitTorrent protocol” -j DROP iptables -A INPUT -p udp -m string --algo bm --string “peer_id=” -j DROP iptables -A INPUT -p udp -m string --algo bm --string “.torrent” -j DROP iptables -A INPUT -p udp -m string --algo bm --string “announce.php?passkey=” -j DROP iptables -A INPUT -p udp -m string --algo bm --string “torrent” -j DROP iptables -A INPUT -p udp -m string --algo bm --string “announce” -j DROP iptables -A INPUT -p udp -m string --algo bm --string “info_hash” -j DROP iptables -A INPUT -p udp -m string --algo bm --string “tracker” -j DROP
iptables -I INPUT -p udp -m string --algo bm --string “BitTorrent” -j DROP iptables -I INPUT -p udp -m string --algo bm --string “BitTorrent protocol” -j DROP iptables -I INPUT -p udp -m string --algo bm --string “peer_id=” -j DROP iptables -I INPUT -p udp -m string --algo bm --string “.torrent” -j DROP iptables -I INPUT -p udp -m string --algo bm --string “announce.php?passkey=” -j DROP iptables -I INPUT -p udp -m string --algo bm --string “torrent” -j DROP iptables -I INPUT -p udp -m string --algo bm --string “announce” -j DROP iptables -I INPUT -p udp -m string --algo bm --string “info_hash” -j DROP iptables -I INPUT -p udp -m string --algo bm --string “tracker” -j DROP
iptables -D INPUT -p udp -m string --algo bm --string “BitTorrent” -j DROP iptables -D INPUT -p udp -m string --algo bm --string “BitTorrent protocol” -j DROP iptables -D INPUT -p udp -m string --algo bm --string “peer_id=” -j DROP iptables -D INPUT -p udp -m string --algo bm --string “.torrent” -j DROP iptables -D INPUT -p udp -m string --algo bm --string “announce.php?passkey=” -j DROP iptables -D INPUT -p udp -m string --algo bm --string “torrent” -j DROP iptables -D INPUT -p udp -m string --algo bm --string “announce” -j DROP iptables -D INPUT -p udp -m string --algo bm --string “info_hash” -j DROP iptables -D INPUT -p udp -m string --algo bm --string “tracker” -j DROP
iptables -I OUTPUT -p udp -m string --algo bm --string “BitTorrent” -j DROP iptables -I OUTPUT -p udp -m string --algo bm --string “BitTorrent protocol” -j DROP iptables -I OUTPUT -p udp -m string --algo bm --string “peer_id=” -j DROP iptables -I OUTPUT -p udp -m string --algo bm --string “.torrent” -j DROP iptables -I OUTPUT -p udp -m string --algo bm --string “announce.php?passkey=” -j DROP iptables -I OUTPUT -p udp -m string --algo bm --string “torrent” -j DROP iptables -I OUTPUT -p udp -m string --algo bm --string “announce” -j DROP iptables -I OUTPUT -p udp -m string --algo bm --string “info_hash” -j DROP iptables -I OUTPUT -p udp -m string --algo bm --string “tracker” -j DROP
Delete
iptables -D INPUT -m string --algo bm --string “BitTorrent” -j DROP iptables -D INPUT -m string --algo bm --string “BitTorrent protocol” -j DROP iptables -D INPUT -m string --algo bm --string “peer_id=” -j DROP iptables -D INPUT -m string --algo bm --string “.torrent” -j DROP iptables -D INPUT -m string --algo bm --string “announce.php?passkey=” -j DROP iptables -D INPUT -m string --algo bm --string “torrent” -j DROP iptables -D INPUT -m string --algo bm --string “announce” -j DROP iptables -D INPUT -m string --algo bm --string “info_hash” -j DROP iptables -D INPUT -m string --algo bm --string “tracker” -j DROP
iptables -D OUTPUT -m string --algo bm --string “BitTorrent” -j DROP iptables -D OUTPUT -m string --algo bm --string “BitTorrent protocol” -j DROP iptables -D OUTPUT -m string --algo bm --string “peer_id=” -j DROP iptables -D OUTPUT -m string --algo bm --string “.torrent” -j DROP iptables -D OUTPUT -m string --algo bm --string “announce.php?passkey=” -j DROP iptables -D OUTPUT -m string --algo bm --string “torrent” -j DROP iptables -D OUTPUT -m string --algo bm --string “announce” -j DROP iptables -D OUTPUT -m string --algo bm --string “info_hash” -j DROP iptables -D OUTPUT -m string --algo bm --string “tracker” -j DROP
iptables -D FORWARD -m string --algo bm --string “BitTorrent” -j DROP iptables -D FORWARD -m string --algo bm --string “BitTorrent protocol” -j DROP iptables -D FORWARD -m string --algo bm --string “peer_id=” -j DROP iptables -D FORWARD -m string --algo bm --string “.torrent” -j DROP iptables -D FORWARD -m string --algo bm --string “announce.php?passkey=” -j DROP iptables -D FORWARD -m string --algo bm --string “torrent” -j DROP iptables -D FORWARD -m string --algo bm --string “announce” -j DROP iptables -D FORWARD -m string --algo bm --string “info_hash” -j DROP iptables -D FORWARD -m string --algo bm --string “tracker” -j DROP
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Tried all the rules with string init, does not work!!!. Can still download the torrents. may block all the all other ports except browsing
Here is my rules, change the chain as your need.
Tested it and it works when you put them in the forward chain. Tested it over the openvpn and putting (for testing!) this rule at the top of the chain. All other networks can pass and only traffic coming from the 10.8.1.0/24 network is not getting any over 443 :
-A FORWARD -s 10.8.1.0/24 -p tcp --dport 443 -j DROP -A FORWARD -i tun+ -j ACCEPT