Apache, MySQL and PHP living with NT

I have an NT domain which houses a user account for each of our users. I am building an intranet server that will run on Red Hat Linux 7 running PHP and MySQL. I would like to put a lot of information on this web server, but some of it needs to be secured. I can easily create a mysql table to hold all of the user accounts and their (hashed) passwords. However, I would like to use the username and password information that is already in the NT domain so the users don't have two different accounts and passwords. Is there any way to have the Apache/MySQL/PHP apps authenticate against an NT4 domain? Is this a good place for Kerberos or is LDAP a better solution? We have an Exchange server.