That would be challenging depending on the number of dynamic pages, how they are created, etc. (Many variables)
Alternatively, if user is logged in you could create a database with ‘permissions’ and if the person has permission to view that page it will allow them to view it otherwise redirect them somewhere else.
Or if person is not logged in, you could have them enter a ‘password’ one time, store it in session / cookies, and then allow them to view “x” pages, etc.
There are many many ways to create a solution for this.
Whatever approach you take — it may be a bit time consuming to create and/or maintain.