snowflake/hosts/sora/services/tailscale.nix

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{
config,
lib,
pkgs,
...
}: {
sops.secrets.tsauth-sora = {};
environment.systemPackages = [pkgs.jq pkgs.tailscale];
services.tailscale = {
useRoutingFeatures = lib.mkDefault "server"; # important to make it a server, it sets sysctl for ip forwarding without intervention and reboot
};
networking.firewall.allowedUDPPorts = [config.services.tailscale.port];
networking.firewall.trustedInterfaces = [config.services.tailscale.interfaceName];
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
${tailscale}/bin/tailscale up --authkey file:${config.sops.secrets.tsauth-sora.path} --advertise-exit-node=true --accept-dns=false
'';
};
}