iankelling.org Git - distro-setup/blob - transmission-firewall/netns.rules

   1 # note, transmission specific thing here is to
   2 # allow one extra port for transmission-remote, but thats no big deal,
   3 # might as well use this in general for openvpn-nn
   4
   5 # format from iptables-save. [0:0] are comments of packet-count/byte-count
   6 # which I removed
   7 *filter
   8 :INPUT DROP
   9 :FORWARD ACCEPT
  10 :OUTPUT DROP
  11 # from ip route, we can deduce that traffic goes to the
  12 # local 10.8.0.x tun0, then to the normal interface.
  13 # For the normal interface, we allow only some ports:
  14 # dns for root user, vpn, and transmission-remote.
  15 # dns is only used to resolve the vpn server ip on initial
  16 # connection.
  17 # rules are mirror on input and output, just for extra safety,
  18 # although just having output should do fine.
  19
  20 # We could also firewall from outside the nat, for example like this,
  21 # but I'm thinking this is simpler.
  22 #-A FORWARD -i brvpn -p udp -m udp --dport 1194:1195 -j ACCEPT
  23 #-A FORWARD -i brvpn -j REJECT
  24
  25 # prevent dns leaks, openvpn runs as root, allow root to
  26 # make non-vpn dns calls, but not transmission which does not run as root.
  27 # openvpn needs this in order to lookup the ip of the vpn server
  28 # before it's connected to it. We could hardcode the vpn ips in the
  29 # config, but our vpn service provider gave us dns, so the ip might change.
  30 -A OUTPUT -p udp -m udp --dport 53 -m owner --uid-owner root -j ACCEPT
  31 -A INPUT -p udp -m udp --sport 53 -j ACCEPT
  32
  33 -A OUTPUT -p tcp -m tcp --dport 53 -m owner --uid-owner root -j ACCEPT
  34 -A INPUT -p tcp -m tcp --sport 53 -j ACCEPT
  35
  36 # transmission-remote
  37 -A OUTPUT -p tcp -m tcp --sport 9091 -j ACCEPT
  38 -A INPUT -p tcp -m tcp --dport 9091 -j ACCEPT
  39
  40 # 1195 is used for the secondary vpn server
  41 # 1198 is another vpn port, simpler syntax just to use range
  42 -A OUTPUT -p udp -m udp --dport 1194:1198 -j ACCEPT
  43 -A INPUT -p udp -m udp --sport 1194:1198 -j ACCEPT
  44
  45 -A OUTPUT -o tun0 -j ACCEPT
  46 -A INPUT -i tun0 -j ACCEPT
  47
  48 # makes debugging things easier
  49 -A INPUT -p icmp -j ACCEPT
  50 -A OUTPUT -p icmp -j ACCEPT
  51 COMMIT