command-line reverse connection tunnel?

From: Nick Jacobsen (nick@ethicsdesign.com)
Date: 12/20/02

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    From: "Nick Jacobsen" <nick@ethicsdesign.com>
To: <pen-test@securityfocus.com>
Date: Thu, 19 Dec 2002 18:07:57 -0800

    As to the subject, I don't know how else to describe what I need in simple
    words :)

    I am hoping one of you might have an idea on how to implement the following,
    keeping in mind that everything MUST be done using a command-line only. I
    have a machine ("SERVER1") behind a firewall that lets in only port 80, on
    which there is an HTTP server, but lets out all traffic. I need to connect
    my machine ("CLIENT") to that server's Remote Desktop, which runs on port
    3389. I have command line access to the remote machine by sending a reverse
    command prompt. So, the question is, what tools are out there that would
    let me create a tunnel as follows:

    SERVER1 ----> CLIENT1(port whatever) <---- CLIENT1(Listener port 3389)
    CLIENT1(RDP client program) -----> CLIENT1(port 3389) <- Existing Pipe ->
    SERVER1(port 3389)

    To explain, I need a program on SERVER1 that creates a connection to
    CLIENT1. the connection that is created to CLIENT1 then needs to listen on
    port 3389. When CLIENT1 recieves a connection, it needs to pass it through
    the existing pipe, and SERVER1 needs to connect to itself on port 3389.

    Sort of confusing, I know, and any other suggestions would be welcome, with
    the stipulation that, again, SERVER1 can only accept outside connections
    from port 80, but can make connection to any computer.

    Thanks,
    Nick Jacobsen
    Ethics Design
    nick@ethicsdesign.com

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