61 lines
2.2 KiB
Bash
Executable file
61 lines
2.2 KiB
Bash
Executable file
#!/bin/bash
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set -e
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default_route_ip=$(ip route | grep default | awk '{print $3}')
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if [[ -z "$default_route_ip" ]]; then
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echo "No default route configured" >&2
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exit 1
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fi
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configs=`find /etc/wireguard -type f -printf "%f\n"`
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if [[ -z "$configs" ]]; then
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echo "No configuration files found in /etc/wireguard" >&2
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exit 1
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fi
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config=`echo $configs | head -n 1`
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interface="${config%.*}"
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if [[ "$(cat /proc/sys/net/ipv4/conf/all/src_valid_mark)" != "1" ]]; then
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echo "sysctl net.ipv4.conf.all.src_valid_mark=1 is not set" >&2
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exit 1
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fi
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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
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wg-quick up $interface
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# IPv4 kill switch: traffic must be either (1) to the WireGuard interface, (2) marked as a WireGuard packet, (3) to a local address, or (4) to the Docker network
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docker_network="$(ip -o addr show dev eth0 | awk '$3 == "inet" {print $4}')"
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docker_network_rule=$([ ! -z "$docker_network" ] && echo "! -d $docker_network" || echo "")
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iptables -I OUTPUT ! -o $interface -m mark ! --mark $(wg show $interface fwmark) -m addrtype ! --dst-type LOCAL $docker_network_rule -j REJECT
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# IPv6 kill switch: traffic must be either (1) to the WireGuard interface, (2) marked as a WireGuard packet, (3) to a local address, or (4) to the Docker network
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docker6_network="$(ip -o addr show dev eth0 | awk '$3 == "inet6" {print $4}')"
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if [[ "$docker6_network" ]]; then
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docker6_network_rule=$([ ! -z "$docker6_network" ] && echo "! -d $docker6_network" || echo "")
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ip6tables -I OUTPUT ! -o $interface -m mark ! --mark $(wg show $interface fwmark) -m addrtype ! --dst-type LOCAL $docker6_network_rule -j REJECT
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else
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echo "Skipping IPv6 kill switch setup since IPv6 interface was not found" >&2
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fi
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# Support LOCAL_NETWORK environment variable, which was replaced by LOCAL_SUBNET
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if [[ -z "$LOCAL_SUBNET" && "$LOCAL_NETWORK" ]]; then
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LOCAL_SUBNET=$LOCAL_NETWORK
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fi
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if [[ "$LOCAL_SUBNET" ]]; then
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echo "Allowing traffic to local subnet ${LOCAL_SUBNET}" >&2
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ip route add $LOCAL_SUBNET via $default_route_ip
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iptables -I OUTPUT -d $LOCAL_SUBNET -j ACCEPT
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fi
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shutdown () {
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wg-quick down $interface
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exit 0
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}
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trap shutdown SIGTERM SIGINT SIGQUIT
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sleep infinity &
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wait $!
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