{ config, lib, pkgs, ... }: {
  environment.systemPackages = [ pkgs.tailscale ];

  services.tailscale.enable = true;

  systemd.services.tailscale-autoconnect = {
    description = "Automatic oneshot connection to tailscale";

    after = [ "network-pre.target" "tailscale.service" ];
    wants = [ "network-pre.target" "tailscale.service" ];
    wantedBy = [ "multi-user.target" ];

    serviceConfig.Type = "oneshot";

    script = with pkgs; ''
      sleep 2

      status="$(${tailscale}/bin/tailscale status -json | ${jq}/bin/jq -r .BackendState)"
      if [ $status = "Running" ]; then # if so, then do nothing
        exit 0
      fi

      ${tailscale}/bin/tailscale up -authkey ${config.age.secrets.tailscale.path}
    '';
  };

  networking.firewall = {
    trustedInterfaces = [ "tailscale0" ];
    allowedUDPPorts = [ config.services.tailscale.port ];
    allowedTCPPorts = [ 22 ];
  };
}