infra/nixos/hosts/silver/services/nebula.nix

{config, ...}: let
  netName = "m-infra"; # TODO: hardcoding
  # https://github.com/NixOS/nixpkgs/blob/nixos-24.05/nixos/modules/services/networking/nebula.nix#L12
  userGroup = "nebula-${netName}";
  interface = "nebula.${netName}";
in {
  sops.secrets."svc-nebula-key" = {
    mode = "0440";
    owner = userGroup;
    group = userGroup;
  };

  networking.firewall = {
    trustedInterfaces = [interface];
    allowedUDPPorts = [4242];
  };

  services.nebula.networks.${netName} = {
    ca = ../../../keys/ca.crt;
    cert = ../../../keys/lh-silver.crt;
    key = config.sops.secrets."svc-nebula-key".path;

    isLighthouse = true;
    isRelay = true;

    listen = {
      host = "0.0.0.0";
      port = 4242;
    };

    firewall.outbound = [
      {
        port = "any";
        proto = "any";
        host = "any";
      }
    ];

    firewall.inbound = [
      # Allow pings from anyone
      {
        port = "any";
        proto = "icmp";
        host = "any";
      }
      # Allow anything from `internal` group
      {
        port = "any";
        proto = "any";
        groups = ["internal"];
      }
      # Allow SSH from anyone
      {
        port = 22;
        proto = "tcp";
        host = "any";
      }
    ];
  };
}