Can a rsync server use MySQL for authentication

[Robert Fargher]

Hi folks,

  I'm considering setting up a commercial backup service.  I've already got 
ProFTPd set up to do secure FTP with remote users authenticating via a MySQL 
lookup.

  What I'd like to know is if I can do the same thing with rsync?  
Specifically, can I run rsync as a daemon that permits secure connections and 
encrypted transfers from remote users using the same MySQL database for 
authentication that I'm already using for ftp?

--
Cheers,
Rob Fargher