Vsftpd may work, from the man page :-
Quote:
local_enable
Controls whether local logins are permitted or not. If enabled,
normal user accounts in /etc/passwd (or wherever your PAM config
references) may be used to log in. This must be enable for any
non-anonymous login to work, including virtual users.
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If you configure the system to authenticate users off AD (winbind|ldap/s) then this should work
cheers