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Re: About SSL Support
From: Joao Correa <joao () livewire com br>
Date: Sat, 6 Jun 2009 23:18:53 -0300

Hello Guys,

I've included some new functions to enable transparent tcp/ssl
connection opening on the comm API. I've also used them on
irc-info.nse and http-trace scripts, enabling SSL support on both.

The tries the best protocol option first, based #1 on service version,
#2 on protocol port and name (if the ports matches a port which is
usually used with or without ssl) and, as a last resource, #3 it
attempts tcp first, since it is more usual than ssl.

I'm sending attached a new version of comm.lua, with the new
functions, and also the scripts.

I'm not sure if comm is the best API for holding the functions, I've
used it since it looked as the best one suited. Since it is a new API,
it is not hard to moving it to a different API or even to a new one.

Joao Correa

On Fri, May 29, 2009 at 6:46 PM, David Fifield<david () bamsoftware com> wrote:
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

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

David Fifield

Attachment: comm.lua

Attachment: http-trace.nse

Attachment: irc-info.nse

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