how can i response respectively to different users?

How can I use FreeRadius and MySql to response respectively to the different users? I need to give different permissons or rights to the logined uses.ShouldI maintain a table that map detailed permission to different uses? How to write the program which handle the tables? Btw, I want to use AES cryptographic algorithm to encrypt the user's password or ID, and store the encrypted results on the FreeRadius Server machine .How can I give different authorizations to different users according to their AES encypted password? Should I write EAP program? Thanks in advance.