Use of ssh certificates in a multi server of different kind environment.

Kevin Denis kevin at
Thu Jul 7 22:44:33 EST 2011


[if I'm not in the right mailing list, please advise it to me]

I'm using ssh certificates for my servers and my users. 
I have questions about it:

I can use the same CA in order to certify all my hosts. Every clients can use it, 
and it's a great setup. But, if I use the same CA for all my clients, it means that 
any clients can log in to any server because hosts trusts my CA. And it's not a 
desired behavior. 

So I made several CAs, one for each type of servers. One for webservers, one 
for svn servers, one for my cluster, end so on.. and it works, but I have to 
manage a lot of keys. And certify each kind of users with the right key.

Is there a way to add in the client certificate the name of the host authorized to 
log in to? With that I could still use only one CA and certify anyone behind it, a 
kind of:
ssh-keygen -s CAKey -I CA -n user1 -O destination_address 

But the destination_address option doesn't exists...

So, am I doing rights with my multiple CA? Or there is a better way?


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