dotfiles/systems/ceres/config/wireguard.nix

{ config, flake, ... }:
let
  inherit (flake.config.services.instances) wireGuard web;
  inherit (flake.config.machines.devices) mars;
  service = wireGuard;
in
{
  networking = {
    firewall = {
      allowedUDPPorts = [
        53
        service.ports.port0
      ];
      interfaces.wg0.allowedTCPPorts = [
        80
        443
        8080
      ];
    };

    nat = {
      enable = true;
      enableIPv6 = true;
      externalInterface = "eth0";
      internalInterfaces = [ "wg0" ];
    };

    wireguard.interfaces = {
      wg0 = {
        ips = [ "${web.wireguard.interface0}/24" ];
        listenPort = service.ports.port0;
        privateKeyFile = config.sops.secrets."${service.name}-private".path;
        peers = [
          {
            publicKey = "9zfRPxkxTLHM9tABC8lIaDMrzdjcF2l1mtG82uqGKUQ=";
            allowedIPs = [ "${mars.wireguard.ip0}/32" ];
          }
        ];
      };
    };
  };

  sops.secrets =
    let
      sopsPath = secret: {
        path = "${service.sops.path0}/${service.name}-${secret}";
        owner = "root";
        mode = "600";
      };
    in
    (map
      (secret: {
        name = "${service.name}-${secret}";
        value = sopsPath secret;
      })
      [
        "private"
        "public"
      ]
    );

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