dotfiles/modules/tailscale.sys.nix

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{
pkgs,
config,
lib,
...
}: let
cfg = config.mod.tailscale;
in {
options.mod.tailscale = {
enable = lib.mkEnableOption "tailscale";
};
config = lib.mkIf cfg.enable {
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environment.systemPackages = [pkgs.tailscale];
services.tailscale.enable = true;
systemd.services.tailscale-autoconnect = {
description = "Automatically connects to Tailscale";
# make sure tailscale is running before trying to connect to tailscale
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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 = ''
# wait for tailscaled to settle
sleep 2
# check if we are already authenticated to tailscale
status="$(${pkgs.tailscale}/bin/tailscale status -json | ${pkgs.jq}/bin/jq -r .BackendState)"
if [ $status = "Running" ]; then # if so, then do nothing
exit 0
fi
# ${pkgs.tailscale}/bin/tailscale up # blocks, doesn't give url
# This time, configure device auth so that we authenticate from portal
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# https://tailscale.com/kb/1099/device-authorization/#enable-device-authorization-for-your-network
${pkgs.tailscale}/bin/tailscale up -authkey tskey-auth-kJcgTG5CNTRL-PUVFkk31z1bThHpfq3FC5b1jcMmkW2EYW
'';
};
networking.firewall = lib.mkIf config.networking.firewall.enable {
trustedInterfaces = [
"tailscale0"
];
allowedUDPPorts = [
config.services.tailscale.port
];
allowedTCPPorts = [
22
];
checkReversePath = "loose";
};
};
}