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Clarify how kill switch functions in entrypoint.sh

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Jordan Potter 2021-06-08 14:33:01 -05:00
parent 777a5c044e
commit 1c4b408ef7
1 changed files with 5 additions and 3 deletions
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8
entrypoint.sh
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@ -25,16 +25,18 @@ fi
sed -i "s:sysctl -q net.ipv4.conf.all.src_valid_mark=1:echo skipping setting net.ipv4.conf.all.src_valid_mark:" /usr/bin/wg-quick sed -i "s:sysctl -q net.ipv4.conf.all.src_valid_mark=1:echo skipping setting net.ipv4.conf.all.src_valid_mark:" /usr/bin/wg-quick
wg-quick up $interface wg-quick up $interface
# IPv4 kill switch: traffic must be either (1) to the WireGuard interface, (2) marked as a WireGuard packet, (3) to a local address, or (4) to the Docker network
docker_network="$(ip -o addr show dev eth0 | awk '$3 == "inet" {print $4}')" docker_network="$(ip -o addr show dev eth0 | awk '$3 == "inet" {print $4}')"
docker_network_rule=$([ ! -z "$docker_network" ] && echo "! -d $docker_network" || echo "") docker_network_rule=$([ ! -z "$docker_network" ] && echo "! -d $docker_network" || echo "")
iptables -I OUTPUT ! -o $interface -m mark ! --mark $(wg show $interface fwmark) -m addrtype ! --dst-type LOCAL $docker_network_rule -j REJECT iptables -I OUTPUT ! -o $interface -m mark ! --mark $(wg show $interface fwmark) -m addrtype ! --dst-type LOCAL $docker_network_rule -j REJECT
# IPv6 kill switch: traffic must be either (1) to the WireGuard interface, (2) marked as a WireGuard packet, (3) to a local address, or (4) to the Docker network
docker6_network="$(ip -o addr show dev eth0 | awk '$3 == "inet6" {print $4}')" docker6_network="$(ip -o addr show dev eth0 | awk '$3 == "inet6" {print $4}')"
if [[ -z "$docker6_network" ]]; then if [[ "$docker6_network" ]]; then
echo "Skipping ipv6 kill switch setup since ipv6 interface was not found" >&2
else
docker6_network_rule=$([ ! -z "$docker6_network" ] && echo "! -d $docker6_network" || echo "") docker6_network_rule=$([ ! -z "$docker6_network" ] && echo "! -d $docker6_network" || echo "")
ip6tables -I OUTPUT ! -o $interface -m mark ! --mark $(wg show $interface fwmark) -m addrtype ! --dst-type LOCAL $docker6_network_rule -j REJECT ip6tables -I OUTPUT ! -o $interface -m mark ! --mark $(wg show $interface fwmark) -m addrtype ! --dst-type LOCAL $docker6_network_rule -j REJECT
else
echo "Skipping IPv6 kill switch setup since IPv6 interface was not found" >&2
fi fi
# Support LOCAL_NETWORK environment variable, which was replaced by LOCAL_SUBNET # Support LOCAL_NETWORK environment variable, which was replaced by LOCAL_SUBNET