{
  privateKey,
  publicKey,
  username,
  ...
}:
{
  # default host key location
  environment.etc."ssh/ssh_host_ed25519_key" = {
    text = privateKey;
    mode = "0600";
  };
  environment.etc."ssh/ssh_host_ed25519_key.pub" = {
    text = publicKey;
    mode = "0644";
  };

  services.openssh = {
    enable = true;
    settings = {
      PasswordAuthentication = false;
      PermitRootLogin = "no";
      AllowUsers = [ "${username}" ];
    };
    generateHostKeys = false;
    hostKeys = [
      {
        path = "/etc/ssh/ssh_host_ed25519_key";
        type = "ed25519";
      }
    ];
  };
}