how to restrict rscync to ONLY use ssh-pubkey transport & auth?

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hi all,

i have two OSX boxes set up for ssh via pubkey auth only.

i'm setting up rsync comms for the first time.

i have rsyncd running on box A.

no-auth rsync from box B to/from box A's rsyncd works as expected.

rsync at B to/from rsyncd at A using pubkey-auth'd-ssh trasport:

	rsync --verbose --stats --recursive -e "ssh -F $MY_SSH_CONF -l $MY_USER" /path_to_src_dir/*
BOX_A_FQDN::targetdir

ALSO works as expected.

i've easily managed to turn connection/sync-ing ON. so, how do i turn specific access types OFF?

specifically, i'd like to limit rsync to ONLY allow the pubkey+ssh transport, and NOT any other
channel?

high odds are that an option in rsyncd.conf already exists ... question is which one/combo?
just not clear 2 me at the moment :-/

thx!

richard
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