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Re: About SSL Support
From: David Fifield <david () bamsoftware com>
Date: Fri, 29 May 2009 15:46:12 -0600

On Fri, May 29, 2009 at 03:28:39PM -0300, Joao Correa wrote:
I´m working on the SSL support for some scripts, making them work
correctly under normal TCP connections or under SSL connections.

I´ve been facing situations where using connect with TCP flag to
estabilish a connection with a SSL service returns true as status, but
the connection itself cannot be handled. In the irc-info script, for
example, I had to first try connect with SSL flag, if the server does
not support SSL it returns false, and so I try connect again with TCP
flag. Doing the other way (TCP first and SSL if false) won´t work,
since connect with TCP returns true.

I have some ideas, but I´m not pretty sure about what is the cause of
this problem. Anyway, since I´ve found a way out I think is isn´t a
big problem (trying SSL fisrt, and TCP second works pretty fine for
all cases).

I´ve been wondering If I should work on a new flag for connect, maybe
TRYSSL, to enable trying SSL first, and if not possible, trying TCP
automatically. I could also try to work on connect function, to return
false if the flag is TCP but the service requires SSL.

Another layer of abstraction sounds like a good idea. You could
"subclass" the type of object returned by nmap.new_socket. It would
default to a plain TCP connect, and essentially just pass on all
function calls to the underlying socket object. But if the very first
send fails, it would reconnect using SSL and try sending again. If a
send fails after that then it will be reported to the caller. You could
also give it a hint to start with SSL if you know it from version
detection.

You could probably implement something like this in pure Lua. Patrick,
what do you think of this idea?

David Fifield

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