{
  lib,
  config,
  pkgs,
  ...
}: {
  lyn.sops.enable = true;
  nix.settings.experimental-features = ["nix-command" "flakes"];
  nixpkgs.config.allowUnfree = true;
  nix.package = config.pkgsInstances.unstable.lix;
  environment.variables.EDITOR = "nvim";

  #initialize mesh vpn secret
  lyn.sops.secrets."all/meshnetwork/gossip_secret" = {};

  # TODO
  time.timeZone = "Europe/Berlin";

  # Firewall base config:
  networking.firewall.enable = lib.mkDefault true;
  networking.firewall.allowPing = true;
  # SSH:
  services.openssh = {
    enable = true;
    settings = {
      X11Forwarding = true;
      PermitRootLogin = "yes";
      PasswordAuthentication = false;
      KbdInteractiveAuthentication = false;
    };
    openFirewall = true;
  };

  # Disable password checking for wheel group users so we can rely on ssh keys.
  # WARNING: This has an security impact!
  security.sudo.wheelNeedsPassword = false;

  environment.systemPackages = with pkgs; [
    git
    vim
    neovim
    wget
    curl
    htop
  ];
  # Use encrypted Quad9 DNS
  networking.nameservers = ["127.0.0.1" "::1"];
  services.dnscrypt-proxy2 = {
    enable = true;
    settings = {
      ipv6_servers = true;
      require_dnssec = true;

      sources.public-resolvers = {
        urls = [
          "https://raw.githubusercontent.com/DNSCrypt/dnscrypt-resolvers/master/v3/public-resolvers.md"
          "https://download.dnscrypt.info/resolvers-list/v3/public-resolvers.md"
        ];
        cache_file = "/var/lib/dnscrypt-proxy2/public-resolvers.md";
        minisign_key = "RWQf6LRCGA9i53mlYecO4IzT51TGPpvWucNSCh1CBM0QTaLn73Y7GFO3";
      };

      # You can choose a specific set of servers from https://github.com/DNSCrypt/dnscrypt-resolvers/blob/master/v3/public-resolvers.md
      server_names = ["quad9-dnscrypt-ip4-nofilter-pri" "quad9-dnscrypt-ip6-nofilter-pri"];
    };
  };

  systemd.services.dnscrypt-proxy2.serviceConfig = {
    StateDirectory = "dnscrypt-proxy";
  };

  nix.gc = {
    automatic = true;
    persistent = true;
    options = "--delete-older-than 8d";
  };
}