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firewall.sh
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firewall.sh
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#!/bin/sh
LAN_IF=br-iso1
WAN_IF=br-iso0
# block VM accessing the internet
BLOCK_PORT="22 23 101 107 512 513 992"
BLOCK_NET="192.168.0.0/16 172.0.0.0/8 169.0.0.0/8 127.0.0.0/8 10.0.0.0/8"
# forward host ports to VM's
FORWARD_PORTS="80 443 1024:65535"
PROXY_PORTS="80 443"
patch_legacy(){
iptables-legacy -N ISKVM_FWI && iptables-legacy -A ISKVM_FWI -j ACCEPT && iptables-legacy -A FORWARD -i $WAN_IF -j ISKVM_FWI
iptables-legacy -N ISKVM_FWO && iptables-legacy -A ISKVM_FWO -j ACCEPT && iptables-legacy -A FORWARD -o $WAN_IF -j ISKVM_FWO
return 0
}
unblock(){
local port
iptables -t nat -F ISKVM_FWD
iptables -t nat -A ISKVM_FWD -i $WAN_IF -j RETURN
iptables -t nat -A ISKVM_FWD -i $LAN_IF -j RETURN
iptables -F ISKVM_WEB
# port forward
for port in $FORWARD_PORTS ; do
iptables -t nat -A ISKVM_FWD -p tcp -m tcp --dport $port -j DNAT --to-destination 192.168.100.1:`echo $port | sed 's/:/-/g'`
iptables -t nat -A ISKVM_FWD -p udp -m udp --dport $port -j DNAT --to-destination 192.168.100.1:`echo $port | sed 's/:/-/g'`
done
# proxy by nginx or something
[ -z "$PROXY_PORTS" ] && return 0
for port in $PROXY_PORTS ; do
iptables -A ISKVM_WEB -p tcp -m tcp --dport $port -j ACCEPT
iptables -A ISKVM_WEB -p udp -m udp --dport $port -j ACCEPT
done
}
block(){
local port
iptables -t nat -F ISKVM_FWD
iptables -t nat -A ISKVM_FWD -i $WAN_IF -j RETURN
iptables -t nat -A ISKVM_FWD -i $LAN_IF -j RETURN
iptables -F ISKVM_WEB
[ -z "$PROXY_PORTS" ] && return 0
for port in $PROXY_PORTS ; do
iptables -A ISKVM_WEB -p tcp -m tcp --dport $port -j REJECT --reject-with icmp-port-unreachable
iptables -A ISKVM_WEB -p udp -m udp --dport $port -j REJECT --reject-with icmp-port-unreachable
done
}
start(){
local chain
local port
local net
stop >/dev/null 2>&1
# filter table
for chain in ISKVM_INP ISKVM_FWI ISKVM_FWO ISKVM_FWB ISKVM_OUT ISKVM_WEB ; do
iptables -N $chain
iptables -F $chain
done
iptables -A ISKVM_INP -d 172.11.1.0/24 -p icmp -m icmp --icmp-type 8 -j ACCEPT
iptables -A ISKVM_INP -d 192.168.100.0/24 -p icmp -m icmp --icmp-type 8 -j ACCEPT
iptables -A ISKVM_INP -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -A ISKVM_INP -j REJECT --reject-with icmp-host-prohibited
iptables -A ISKVM_FWI ! -s 172.11.1.0/24 -j DROP
iptables -A ISKVM_FWI -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
# deny accessing local network
for net in $BLOCK_NET ; do
iptables -A ISKVM_FWI -d $net -j REJECT --reject-with icmp-host-prohibited
done
# avoid being zombie
for port in $BLOCK_PORT ; do
iptables -A ISKVM_FWI -p udp -m udp --dport $port -j REJECT --reject-with icmp-port-unreachable
iptables -A ISKVM_FWI -p tcp -m tcp --dport $port -j REJECT --reject-with icmp-port-unreachable
done
iptables -A ISKVM_FWI -m addrtype --dst-type UNICAST -j ACCEPT
iptables -A ISKVM_FWI -j DROP
iptables -A ISKVM_FWO -j ACCEPT
iptables -A ISKVM_FWB -j DROP
iptables -A ISKVM_OUT -j ACCEPT
iptables -I INPUT -j ISKVM_WEB
iptables -I INPUT -i $WAN_IF -j ISKVM_INP
iptables -I INPUT -i $LAN_IF -j ISKVM_INP
iptables -I FORWARD -i $WAN_IF -j ISKVM_FWI
iptables -A FORWARD -o $WAN_IF -j ISKVM_FWO
iptables -I FORWARD -i $LAN_IF -j ISKVM_FWB
iptables -A FORWARD -o $LAN_IF -j ISKVM_FWO
iptables -A OUTPUT -o $LAN_IF -j ISKVM_OUT
iptables -A OUTPUT -o $WAN_IF -j ISKVM_OUT
# nat table, out
iptables -t nat -N ISKVM_INET
iptables -t nat -F ISKVM_INET
# iptables -t nat -A ISKVM_INET -i $WAN_IF ! -o $WAN_IF -j MASQUERADE
iptables -t nat -A ISKVM_INET ! -s 172.11.1.0/24 -j RETURN
for net in $BLOCK_NET ; do
iptables -t nat -A ISKVM_INET -d $net -j ACCEPT
done
iptables -t nat -A ISKVM_INET -d 172.11.1.0/24 -j ACCEPT
iptables -t nat -A ISKVM_INET -j MASQUERADE
iptables -t nat -I POSTROUTING -j ISKVM_INET
# nat table, forward host ports to VM's
iptables -t nat -N ISKVM_FWD
block
iptables -t nat -A PREROUTING -m addrtype --dst-type LOCAL -j ISKVM_FWD
patch_legacy >/dev/null 2>&1
}
unpatch_legacy(){
iptables-legacy -D FORWARD -i $WAN_IF -j ISKVM_FWI
iptables-legacy -D FORWARD -o $WAN_IF -j ISKVM_FWO
iptables-legacy -F ISKVM_FWI
iptables-legacy -X ISKVM_FWI
iptables-legacy -F ISKVM_FWO
iptables-legacy -X ISKVM_FWO
return 0
}
stop(){
local chain
iptables -t nat -D PREROUTING -m addrtype --dst-type LOCAL -j ISKVM_FWD
iptables -t nat -D POSTROUTING -j ISKVM_INET
iptables -D INPUT -j ISKVM_WEB
iptables -D INPUT -i $WAN_IF -j ISKVM_INP
iptables -D INPUT -i $LAN_IF -j ISKVM_INP
iptables -D FORWARD -i $WAN_IF -j ISKVM_FWI
iptables -D FORWARD -o $WAN_IF -j ISKVM_FWO
iptables -D FORWARD -i $LAN_IF -j ISKVM_FWB
iptables -D FORWARD -o $LAN_IF -j ISKVM_FWO
iptables -D OUTPUT -o $LAN_IF -j ISKVM_OUT
iptables -D OUTPUT -o $WAN_IF -j ISKVM_OUT
for chain in ISKVM_INP ISKVM_FWI ISKVM_FWO ISKVM_FWB ISKVM_OUT ISKVM_WEB ; do
iptables -F $chain
iptables -X $chain
done
iptables -t nat -F ISKVM_INET
iptables -t nat -X ISKVM_INET
iptables -t nat -F ISKVM_FWD
iptables -t nat -X ISKVM_FWD
unpatch_legacy >/dev/null 2>&1
}
ACTION=${1}
shift 1
[ -z "${ACTION}" ] && ACTION=help
case ${ACTION} in
"start" | "stop" | "block" | "unblock")
${ACTION}
;;
*)
echo "Unknown Action" >&2
exit 1
;;
esac