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Re: Nmap NSE: Bad Behaviour
From: "DePriest, Jason R." <jrdepriest () gmail com>
Date: Mon, 9 Jun 2008 22:44:31 +0100

On Sat, May 31, 2008 at 12:41 AM, Fyodor <fyodor () insecure org> wrote:
On Fri, May 30, 2008 at 03:26:45PM +0100, jah wrote:

So first off, my suggestion to change the user-agent to firefox was
tongue-in-cheek - I'm sure that was apparent, but I thought I'd better
emphasise it in case it gets misconstrued.

Heh, well I didn't thing it was a terrible idea :).  Sometimes you
want to be stealthy and blend into the crowd.  But at other times
there is value in being above-board and stating that we're Nmap NSE
and damn proud of it!  Right now I think the our http library user
agent is just "Nmap NSE".  I think we should at least use a more
standard format.  Here is what Yahoo uses:

Mozilla/5.0 (compatible; Yahoo! Slurp/3.0; http://help.yahoo.com/help/us/ysearch/slurp)

We could use something similar:

Mozilla/5.0 (compatible; Nmap Scripting Engine; http://nmap.org/book/nse.html)

Unless someone has a better idea, I'll change it to this for now.  If
a bunch of idiots start misunderstanding and thinking it is me trying
to hack their server just because I host the NSE documentation page,
the URL is going away.  Or maybe I'll just change it to sco.com or
microsoft.com :).

I agree that it would be nice to have an NSE option argument to set
your own user agent.

Cheers,
-F

For lots of examples: http://www.useragentstring.com/pages/useragentstring.php

Shouldn't the user agent string have a version number in it, too?

And it is really Mozilla/5.0 compatible or are you just trying to make
sure it gives up useful information?

That's a thought.  Some websites change their response based on user
agent.  This may have unforeseen consequences.

-Jason

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