Does you have any database table which have AD users details. If so, you can use same.
Table will get update automatically when a new user added to your database.
If not, below link might help you
I am not managing my users in any database. It is based on AD groups NTNAME.
My issue is everytime a new user added into NT AD group, i have to update my section access table for that user.
Which i dont want as its a manual work everytime.
So is it possible to do section access based on AD groups only