NixOS/hosts/luna/modules/services/openssh.nix

{ ... }:
{
  services.openssh = {
    enable = true;
    settings = {
      PasswordAuthentication = false;
      PermitRootLogin = "prohibit-password";
      KexAlgorithms = [
        "curve25519-sha256"
        "curve25519-sha256@libssh.org"
        "diffie-hellman-group16-sha512"
        "diffie-hellman-group18-sha512"
        "sntrup761x25519-sha512@openssh.com"
      ];
    };
    ports = [
      2200
    ];
  };
}