{ config, lib, pkgs, ... }: let cfg = config.local.wireguard; port = 51820; serverAddr = (import ../hosts/canigou/data.secret.nix).addr; # Run `ip route` to show gateway defaultGateway = "192.168.0.1"; in { options.local.wireguard = with lib; { enable = mkEnableOption "Enable wireguard vpn"; ip = mkOption { type = types.str; description = "10.100.0./24"; example = "10.100.0.1/24"; }; privateKeyFile = mkOption { type = types.str; }; }; config = lib.mkIf cfg.enable { networking.firewall = { allowedUDPPorts = [ port ]; # Clients and peers can use the same port, see listenport }; # Enable WireGuard networking.wireguard.interfaces = { # "wg0" is the network interface name. You can name the interface arbitrarily. wg0 = { # Determines the IP address and subnet of the client's end of the tunnel interface. ips = [ cfg.ip ]; listenPort = port; # to match firewall allowedUDPPorts (without this wg uses random port numbers) # Path to the private key file. privateKeyFile = cfg.privateKeyFile; # Add a more specific ip route allowing trafgfic to the VPN via the default gateway # Source: https://discourse.nixos.org/t/route-all-traffic-through-wireguard-interface/1480/18 postSetup = "${pkgs.iproute}/bin/ip route add ${serverAddr} via ${defaultGateway}"; postShutdown = "${pkgs.iproute}/bin/ip route del ${serverAddr} via ${defaultGateway}"; peers = [ # For a client configuration, one peer entry for the server will suffice. { # Public key of the server (not a file path). publicKey = "nFqvL30dkKkhOt+fLJ+EJNmp9GjkXVjmpz1WRI1pG0A="; # Forward all the traffic via VPN. allowedIPs = [ "0.0.0.0/0" ]; # Or forward only particular subnets # allowedIPs = [ "192.168.0.0/24" ]; # Set this to the server IP and port. endpoint = "${serverAddr}:${toString port}"; # Send keepalives every 25 seconds. Important to keep NAT tables alive. persistentKeepalive = 25; dynamicEndpointRefreshRestartSeconds = 5; } ]; }; }; }; }