config/modules/base/sshd/default.nix

{
  config,
  lib,
  myData,
  ...
}:
{
  config = {
    services.openssh = {
      enable = true;
      settings = {
        PasswordAuthentication = false;
        PermitRootLogin = "no";
      };
    };
    programs.mosh.enable = true;
    programs.ssh.knownHosts =
      let
        sshAttrs = lib.genAttrs [
          "extraHostNames"
          "publicKey"
        ] (_: null);
      in
      lib.mapAttrs (_name: builtins.intersectAttrs sshAttrs) myData.hosts;
  };
}