[Fedora-directory-users] Authentication through Active Directory

Hi all, I'm in an account of a bigger company, which uses Microsoft Active Directory for User Management and Authentication. Now we need to save some additional information for a subset of all employees, but the AD-Administrators do not want to include the required attributes in the company ad. Our plan is now to install "Fedora Directory Server" to hold these additional information. The users, which uses a special application, should now connect to this server to retrieve the necessary information, but the authentication should stay in the AD. Is it possible, and if yes how, to configure "Fedora Directory Server" to pass the authentication information to the AD and only let the specific user bind to the directory server if the AD-Authentication is OK? Thanks in advance Joerg Schoppet