On Wednesday Feb 22, 2006 around 1:37pm, Steve Friedl wrote,
> Hello all,
>
> While trying to convince a customer that he really needs to get away
> from password auth on his SSH servers, I ended up diving in to make
> some detailed notes on how key agents and forwarding work. The outcome
> of this was a new Tech Tip which explains it in some detail:
>
> Unixwiz.net Tech Tip: An Illustrated Guide to SSH Agent Forwarding
> http://www.unixwiz.net/techtips/ssh-agent-forwarding.html
>
> I hope some find this helpful.
>
> Regards,
> Steve
Here's something you missed in the "Cons" section of agent
forwarding:
[EMAIL PROTECTED]: ssh-add
[EMAIL PROTECTED]: (enter key)
[EMAIL PROTECTED]: ssh -A customer
[EMAIL PROTECTED]: ssh remote
[EMAIL PROTECTED]: sleep 86400
And while you are sleeping:
[EMAIL PROTECTED] does this:
export SSH_AUTH_SOCK=`find /tmp -user lala -name 'agent.*' | head -1`
ssh-copy-id [EMAIL PROTECTED]
ssh-copy-id [EMAIL PROTECTED]
ssh-copy-id [EMAIL PROTECTED]
ssh-copy-id [EMAIL PROTECTED]
(Oops) (that's a lot easier than subverting ssh to insert
something evil into the stream that will hack into the remote)
If there are untrusted machines involved you may prefer this:
ssh-add -c
Note that ssh-agent does not identify the origin of requests for
authentication (a bug?), so its confirmation is not fail-safe.
&:-)
--
Leading Edge Business Solutions +27 11 656 0360
Linux Training, Software and Networking http://ledge.co.za/
Linux - laai niks anders
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