os/hosts/frikandel/wireguard.nix

{
  flake,
  config,
  pkgs,
  ...
}: {
  age.secrets.wg-private-key-server.file = "${flake.self}/secrets/wg-private-frikandel-server.age";

  boot.kernel.sysctl = {
    "net.ipv4.ip_forward" = 1;
  };

  networking.nat = {
    enable = true;
    enableIPv6 = true;
    internalInterfaces = [ "wg-server" ];
  };

  networking.firewall.allowedUDPPorts = [ 51899 ];
  networking.firewall.extraForwardRules = [
    "iifname wg0 accept"
    "iifname enp1s0 reject"
  ];

  # Enable WireGuard
  networking.wg-quick.interfaces = {
    wg0 = {
      listenPort = 51899;

      address = [ "10.0.1.7/32" ];

      privateKeyFile = "/run/agenix/wg-private-key-server";

      peers = [
        { # pie
          publicKey = "hPTXEqQ2GYEywdPNdZBacwB9KKcoFZ/heClxnqmizyw=";
          allowedIPs = [ "10.0.1.2/32" ];
          persistentKeepalive = 25;
        }
        { # droppie
          publicKey = "qsnBMoj9Z16D8PJ5ummRtIfT5AiMpoF3SoOCo4sbyiw=";
          allowedIPs = [ "10.0.1.3/32" ];
          persistentKeepalive = 25;
        }
        { # chocolatebar
          publicKey = "nk8EtGE/QsnSEm1lhLS3/w83nOBD2OGYhODIf92G91A=";
          allowedIPs = [ "10.0.1.5/32" ];
          persistentKeepalive = 25;
        }
        { # biolimo
          publicKey = "4ymN7wwBuhF+h+5fFN0TqXmVyOe1AsWiTqRL0jJ3CDc=";
          allowedIPs = [ "10.0.1.6/32" ];
          persistentKeepalive = 25;
        }
      ];
    };
  };
}