I would like to disable password login for a user, say root. But instead of the error message (Public key) I would not like the user notice that the password login is disabled and prompting him for password.

So far I know I can disable password login for all users except one with

PasswordAuthentication no
Match User toto
PasswordAuthentication yes

But attempting to login as root will result an error message from the server, which I do not wish.

Do I need to modify openssh sources to do that? Or is there a configuration option which can do the job?

Edit:

Having two ssh servers running is an option, so killing connections with iptables or via another method (outside ssh configuration) is an option.

Edit 2:

I want to do this as I need two ssh instances, one in the official door to get in and the other is a honeypot. So the bots will give me their password but never letting them in. (nb: this is a personal project I am the only one using the server and not logging colleagues passwords nor other nasty things, I just want to make some stats on bots)

Actually PAM should be enabled, but I will double check it.