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Re: [NSE] find-ssh-hostkey script
From: Toni Ruottu <toni.ruottu () iki fi>
Date: Wed, 9 Mar 2011 16:41:14 +0200

Seems useful, yet I am not sure I fully understand the use case behind
this, and if it would be better to have one script for this, or to
have multiple scripts that can be combined to do the job.

The most obvious use case I can come up for this type of script is one
where I would want to perform a port scan on a host that has a certain
ssh key. I could be the admin of a company that has lots of laptops,
and a dhcp server that assigns IP addresses to those laptops
dynamically. All laptops have an ssh daemon in place for remote
administration. Now the CEO calls me and says there is something wrong
with his laptop. Instead of asking him to figure out the IP address of
his computer, I simply look up a database of ssh keys, and define the
scan target by the ssh key.

nmap -sC --script-args
newtargets,sshtarget=AB:CD:EF:AB:CD:EF:AB:CD:EF:AB:CD:EF:AB:CD:AB:CD

(The script could be in default category, and just do nothing unless
there is an sshtarget specification in the argument list.)

Running the command would use the pre script to locate the machine,
and add it to scan targets. Nmap would then scan the host, and tell me
the ip address of the host and services running on it. Maybe some
script could identify a virus on that machine. If one does not want to
perform full port scan on the host one could set the scan type to ping
scan.

Is this the type of usage you had in mind. This is just the picture I
got. Maybe I misunderstood something.


On Tue, Mar 8, 2011 at 6:45 PM, Nick Nikolaou
<nikolasnikolaou1 () gmail com> wrote:
Hey everyone,

Attached is a script I wrote that attempts to identify a host given its SSH
hostkey as an argument. I got the idea from Fyodor's presentation

-- () usage
-- nmap --script=find-ssh-hostkey --script-args
fingerprint=AB:CD:EF:AB:CD:EF:AB:CD:EF:AB:CD:EF:AB:CD:AB:CD
--
-- () output
-- 22/tcp  open  ssh
-- |_find-ssh-hostkey: Key found.


After (limited) testing it seems to work. I don't have access to many
machines running SSH so I can't test it thoroughly.

The script name can be confusing seems it's very similar to other scripts
that show the host's SSH key so feel free to change it to something more
meaningful.

I hope you find it useful.

Any comments are more than welcome.

Nick

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