nixos-config/modules/common/network.nix

{ lib, ... }:
with lib;
{
  config = {
    networking.networkmanager.enable = true;
    networking.useDHCP = mkDefault true;
    networking.firewall.enable = true;

    services.openssh = {
      enable = true;
      settings = {
        StrictModes = true;
        PasswordAuthentication = false;
        KbdInteractiveAuthentication = false;
        PermitEmptyPasswords = "no";
      };

      openFirewall = true;

      hostKeys = [
        {
          comment = "Main key";
          path = "/etc/ssh/ssh_host_ed25519_key";
          type = "ed25519";
        }
      ];
    };
  };
}