Re: Your favorite Ncat/nc/Netcat trick?

[Brandon Enright <bmenrigh () ucsd edu>]

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On Thu, 12 Feb 2009 17:00:09 -0700
David Fifield <david () bamsoftware com> wrote:

> Hello again,
>
> I'd like to have some more examples of fun, useful, or unusual things
> to do with Ncat. I have a few of them, based on my own limited
> experience, at
>
> http://nmap.org/ncat/guide/ncat-tricks.html
> http://nmap.org/ncat/guide/ncat-simple-services.html
>
> What's your favorite Ncat trick? Did it (or nc, etc.) ever get you out
> of a jam? Do you have any experiences that would make good examples
> for the users' guide?
>
> Here are a few web pages that might give you ideas:
> http://nc110.sourceforge.net/
> http://www.softpanorama.org/Net/Netutils/netcat.shtml
>
> My personal favorite trick is the parser-breaking DNS server I used to
> test NSE in http://seclists.org/nmap-dev/2008/q4/0526.html and
> http://seclists.org/nmap-dev/2009/q1/0317.html. I almost included
> that, but then I thought it would require too much explanation.
>
> David Fifield

I often use socat+netcat+perl to unwrap a SSL service and/or modify the
traffic.  For example, to turn IMAPS into IMAP, save the results, and
even mess with what is being sent via a perl script you'd do something
like:

$ mkfifo backpipe
$ while [ 1 == 1 ]; do socat OPENSSL:popmaster.ucsd.edu:993,verify=0 \
STDIO 0<backpipe | nc -l -p 143 | ./filter.pl | tee -a out 1>backpipe; done

Now, I suspect ncat could replace socat for this job.  It certainly
could replace nc.  It could also probably replace the while loop.

Brandon

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