I've created a linux FTP server using the sftp package already on the server. I'm able to add users with passwords and I have the FTP side working fine. I would like to be able to have users login with their Active Directory password (we are on a Windows domain obviously) to connect to the FTP site. The linux server doesn't need to be part of the domain (unless it has to be). Do I use Samba, LDAP? I'm kind of just throwing those words out there, but I'm not sure about any of it.