How can I set up secure remote user file access?

I am a network admin for a school system and I want to implement some kind of home user file access for students and teachers. I want the users to go to a webpage with a simple login that will authenticate to AD (maybe using IAS). For whatever user that is logging on to the computer I want their associated user folder to be mapped to the remote computer they are working on. I want to try and achieve this without any client based software. I just want a simple log in, and maybe a small script that runs on the server side to map that drive upon a successful login. Does anyone have any ideas how I could acheive this? IAS, SFTP, FTP SSL?
Thanks.