On 07/07/2016 06:07 PM, bruce wrote:
What do I need to add to the local box, or to box1 / box2 to permit
to hop from box1 to box2 without having to add a key from/between box1
You need to install the public key on all five systems.
if ssh forwarding is the soln, what has to be added to which files,
SSH agent forwarding requires that you have an agent. If your
workstation is running GNOME, then you have an SSH agent. Otherwise, you
might need to set one up, and that process depends on what your desktop is.
An SSH agent loads your private keys and performs SSH key authentication
on behalf of your SSH clients. If you use "ssh -A" to connect to a
system (for example, box1), then your shell session on that system will
also have a socket that it connected (forwarded) to the SSH agent on
your workstation. When you make another connection (for example, from
the session on box1 to the host box2), the key authentication traffic is
passed between the new host and your workstation.
Forwarding, then, avoids copying your private key to systems other than
your workstation, reducing the opportunity for theft of the private
key. Forwarding is still vulnerable to misuse if you forward the socket
to a system hat has been compromised, but only for as long as you have
an open SSH connection to that system. Your keys should be generated on
your workstation, and your private key should never be copied to any
So, make sure your public key is installed on all of the systems you
want to use as SSH servers, make sure your workstation has an SSH agent
running, and use "ssh -A" to connect when you are going to hop to