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dotfiles/system/nixos/wireguard-netns.nix

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{ pkgs, config, secret, ... }:
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{
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environment.systemPackages = with pkgs; [ ldns tcpdump wireguard-tools ];
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environment.etc."netns/wg/resolv.conf" = {
mode = "0644";
text = ''
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nameserver ${secret.wireguard.dns}
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'';
};
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environment.etc."netns/wg/nsswitch.conf" = {
mode = "0644";
text = ''
passwd: files systemd
group: files [success=merge] systemd
shadow: files
hosts: files mymachines myhostname dns
networks: files
ethers: files
services: files
protocols: files
rpc: files
'';
};
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systemd.services."netns@" = {
description = "%I network namespace";
before = [ "network.target" ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
ExecStart = "${pkgs.iproute}/bin/ip netns add %I";
ExecStop = "${pkgs.iproute}/bin/ip netns del %I";
};
};
systemd.services.wg = {
description = "wg network interface";
bindsTo = [ "netns@wg.service" ];
requires = [ "network-online.target" ];
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after = [ "netns@wg.service" "run-agenix.d.mount" ];
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serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
ExecStart = with pkgs; writers.writeBash "wg-up" ''
set -e
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echo "Setting lo to up ..."
${iproute}/bin/ip -n wg link set lo up
echo "Creating veth bridge ..."
${iproute}/bin/ip link add name vethwghost0 type veth peer name vethwgns0
${iproute}/bin/ip link set vethwgns0 netns wg
${iproute}/bin/ip address add 192.168.42.1/24 dev vethwghost0
${iproute}/bin/ip -n wg address add 192.168.42.2/24 dev vethwgns0
${iproute}/bin/ip link set vethwghost0 up
${iproute}/bin/ip -n wg link set vethwgns0 up
echo "Creating wg0 interface ..."
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${iproute}/bin/ip link add wg0 type wireguard
${wireguard-tools}/bin/wg setconf wg0 ${config.age.secrets.wireguard-config.path}
${iproute}/bin/ip link set wg0 netns wg
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${iproute}/bin/ip -n wg address add ${secret.wireguard.ipv4} dev wg0
${iproute}/bin/ip -n wg -6 address add ${secret.wireguard.ipv6} dev wg0
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${iproute}/bin/ip -n wg link set wg0 up
${iproute}/bin/ip -n wg route add default dev wg0
${iproute}/bin/ip -n wg -6 route add default dev wg0
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echo "Done!"
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'';
ExecStop = with pkgs; writers.writeBash "wg-down" ''
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echo "Tearing down wg0 ..."
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${iproute}/bin/ip -n wg route del default dev wg0
${iproute}/bin/ip -n wg -6 route del default dev wg0
${iproute}/bin/ip -n wg link del wg0
echo "Tearing down veth bridge ..."
${iproute}/bin/ip -n wg link del vethwgns0
${iproute}/bin/ip link del vethwghost0
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echo "Setting lo to down ..."
${iproute}/bin/ip -n wg link set lo down
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echo "Done!"
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'';
};
};
}