home-server/services/coturn.nix

{ config, pkgs, ... }:

{
  sops.secrets."coturn/auth_secret_vps" = {
    sopsFile = ./secrets/coturn_vps.yaml;
    mode = "0400";
    owner = "turnserver";
    group = "turnserver";
  };

  security.acme.certs."turn.ellie.town" = {
    webroot = "/var/lib/acme/acme-challenges";
  };

  networking.firewall = {
    allowedUDPPorts = [ 5349 ];
    allowedTCPPorts = [ 5349 ];
    allowedUDPPortRanges = [
      {
        from = 50201;
        to = 65535;
      }
    ];
  };

  services.coturn = {
    enable = true;

    realm = "turn.ellie.town";

    use-auth-secret = true;
    static-auth-secret-file = config.sops.secrets."coturn/auth_secret_vps".path;

    cert = "/var/lib/acme/turn.ellie.town/fullchain.pem";
    pkey = "/var/lib/acme/turn.ellie.town/key.pem";

    listening-ips = [
      "0.0.0.0"
      "::"
    ];
    listening-port = 3478;
    tls-listening-port = 5349;

    # Plain TURN disabled; only TURNS on 5349 is reachable.
    no-udp = true;
    no-tcp = true;

    lt-cred-mech = true;
    no-tcp-relay = true;

    # Stay above LiveKit's 50000-50200 UDP range (services/livekit.nix).
    min-port = 50201;
    max-port = 65535;
  };

  services.nginx = {
    virtualHosts."turn.ellie.town" = {
      locations."/.well-known/acme-challenge/" = {
        root = "/var/lib/acme/acme-challenges";
      };
    };
  };
}