80 lines
2.5 KiB
Bash
80 lines
2.5 KiB
Bash
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#!/bin/bash
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#set -x
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netvm_subnet=/24
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undetectable_netvm_ips=1
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netns="${vif}-nat"
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netvm_if="${vif}"
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netns_netvm_if="${vif}-p"
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netns_appvm_if="${vif}"
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function run
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{
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#echo "$@" >> /var/log/qubes-nat.log
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"$@"
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}
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function netns
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{
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run ip netns exec "$netns" "$@"
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}
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run ip addr flush dev "$netns_appvm_if"
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run ip netns delete "$netns" || :
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if test "$command" == online; then
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run ip netns add "$netns"
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run ip link set "$netns_appvm_if" netns "$netns"
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run ip link add "$netns_netvm_if" type veth peer name "$netvm_if"
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run ip link set "$netns_netvm_if" netns "$netns"
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netns ip6tables -t raw -I PREROUTING -j DROP
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netns ip6tables -P INPUT DROP
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netns ip6tables -P FORWARD DROP
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netns ip6tables -P OUTPUT DROP
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netns sh -c 'echo 1 > /proc/sys/net/ipv4/ip_forward'
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netns iptables -t raw -I PREROUTING -i "$netns_appvm_if" ! -s "$appvm_ip" -j DROP
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if test -n "$undetectable_netvm_ips"; then
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# prevent an AppVM connecting to its own ProxyVM IP because that makes the internal IPs detectable even with no firewall rules
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netns iptables -t raw -I PREROUTING -i "$netns_appvm_if" -d "$netvm_ip" -j DROP
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# same for the gateway/DNS IPs
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netns iptables -t raw -I PREROUTING -i "$netns_appvm_if" -d "$netvm_gw_ip" -j DROP
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netns iptables -t raw -I PREROUTING -i "$netns_appvm_if" -d "$netvm_dns2_ip" -j DROP
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fi
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netns iptables -t nat -I PREROUTING -i "$netns_netvm_if" -j DNAT --to-destination "$appvm_ip"
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netns iptables -t nat -I POSTROUTING -o "$netns_netvm_if" -j SNAT --to-source "$netvm_ip"
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netns iptables -t nat -I PREROUTING -i "$netns_appvm_if" -d "$appvm_gw_ip" -j DNAT --to-destination "$netvm_gw_ip"
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netns iptables -t nat -I POSTROUTING -o "$netns_appvm_if" -s "$netvm_gw_ip" -j SNAT --to-source "$appvm_gw_ip"
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if test -n "$appvm_dns2_ip"; then
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netns iptables -t nat -I PREROUTING -i "$netns_appvm_if" -d "$appvm_dns2_ip" -j DNAT --to-destination "$netvm_dns2_ip"
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netns iptables -t nat -I POSTROUTING -o "$netns_appvm_if" -s "$netvm_dns2_ip" -j SNAT --to-source "$appvm_dns2_ip"
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fi
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netns ip addr add "$netvm_ip$netvm_subnet" dev "$netns_netvm_if"
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netns ip addr add "$appvm_gw_ip" dev "$netns_appvm_if"
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netns ip link set "$netns_netvm_if" up
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netns ip link set "$netns_appvm_if" up
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netns ip route add "$appvm_ip" dev "$netns_appvm_if" src "$appvm_gw_ip"
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netns ip route add default via "$netvm_gw_ip" dev "$netns_netvm_if" src "$netvm_ip"
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#run ip addr add "$netvm_gw_ip" dev "$netvm_if"
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#run ip link set "$netvm_if" up
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#run ip route add "$netvm_ip" dev "$netvm_if" src "$netvm_gw_ip"
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fi
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