I'm writing a bash script to add simple firewalling for Xen.
Here's the actual firewall configuration :
Chain INPUT (policy ACCEPT)
target prot opt source destination
RH-Firewall-1-INPUT all -- anywhere anywhere
Chain FORWARD (policy ACCEPT)
target prot opt source destination
RH-Firewall-1-INPUT all -- anywhere anywhere
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
Chain RH-Firewall-1-INPUT (2 references)
target prot opt source destination
ACCEPT all -- anywhere anywhere
ACCEPT icmp -- anywhere anywhere icmp any
ACCEPT esp -- anywhere anywhere
ACCEPT ah -- anywhere anywhere
ACCEPT udp -- anywhere 224.0.0.251 udp dpt:mdns
ACCEPT udp -- anywhere anywhere udp dpt:ipp
ACCEPT tcp -- anywhere anywhere tcp dpt:ipp
ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
ACCEPT udp -- anywhere anywhere state NEW udp dpt:ha-cluster
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:http
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:https
REJECT all -- anywhere anywhere reject-with icmp-host-prohibited
I'd like to add a new chain for each of my virtual machines (each of them has a virtual interface called vif1.0, vif2.0, etc). Output interface (bridge) is xenbr0.
Here's what I do (for example to block ping 'in'to domU1, vif1.0) :
iptables -N domUFirewall
iptables -I FORWARD -j domUFirewall
iptables -I INPUT -j domUFirewall
iptables -A domUFirewall -i vif1.0 -p icmp -j DROP
But .. it doesn't work, i'm still able to ping in/out the domU.
Must be something really 'dumb' but I can't find out what's wrong.
Any clues ?
Thx