nixos/modules/tailscale.nix

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2023-04-17 21:22:04 +01:00
{ pkgs, lib, config, ... }:
let
cfg = config.custom.tailscale;
in
{
options.custom.tailscale = {
enable = lib.mkEnableOption "tailscale";
preAuthKeyFile = lib.mkOption {
type = lib.types.str;
};
advertiseRoutes = lib.mkOption {
type = with lib.types; listOf str;
default = [ ];
};
advertiseExitNode = lib.mkOption {
type = lib.types.bool;
default = false;
};
};
config = lib.mkIf cfg.enable {
environment.systemPackages = [ pkgs.tailscale ];
services.tailscale.enable = true;
networking.firewall.checkReversePath = lib.mkIf cfg.advertiseExitNode "loose";
systemd.services.tailscale-autoconnect = {
description = "Automatic connection to Tailscale";
# make sure tailscale is running before trying to connect to tailscale
after = [ "network-pre.target" "tailscale.service" ];
wants = [ "network-pre.target" "tailscale.service" ];
wantedBy = [ "multi-user.target" ];
# set this service as a oneshot job
serviceConfig.Type = "oneshot";
# have the job run this shell script
script = with pkgs; ''
# wait for tailscaled to settle
sleep 2
# check if we are already authenticated to tailscale
status="$(${tailscale}/bin/tailscale status -json | ${jq}/bin/jq -r .BackendState)"
if [ $status = "Running" ]; then # if so, then do nothing
exit 0
fi
# otherwise authenticate with tailscale
${tailscale}/bin/tailscale up \
--authkey "$(<${cfg.preAuthKeyFile})" \
--advertise-routes "${lib.concatStringsSep "," cfg.advertiseRoutes}" \
--advertise-exit-node=${if cfg.advertiseExitNode then "true" else "false"}
'';
};
};
}