Failing to authenticate should do the trick for all the kinds of possible authentication – login form, xmlrpc, ajax, whatever
Edit: actually realized there is a way to save sending the user related query to the DB
function wpse208677_authenticate($user,$username,$pass) {
remove_filter('authenticate','wp_authenticate_username_password',20,3);
return null;
// if you want to whitelist your ip check for it and return $user
}
add_filter('authenticate','wpse208677_authenticate', 10,3)
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