Re: how to re-use existing session?

From: perl coder (perlcdr_at_mail.rumania)
Date: 03/09/04

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    Date: Tue, 09 Mar 2004 16:35:14 GMT

    Darren Tucker said:
    >>[bozo@win98 C:\] ssh -N -L 3333:localhost:22 bozo@linux.box
    >>
    >>Ok now I created a non-interactive session. It's sitting there,
    >>waiting...
    >
    > No, all you did is forward another port to sshd and it gets no free pass.

    Hmm, but I had to authenticate to forward the port. Therefore there is
    a session running, although it's in the background (no shell prompt).
    This can be seen by looking at the network and process info on the client
    and server:

    [client (192.168.1.3)]
    'netstat':
    tcp 0 0 192.168.1.3:33776 192.168.1.101:22 ESTABLISHED
    'ps':
    4556 vc/4 S 0:00 ssh -N -L 3333:localhost:22 bozo@192.168.1.101

    [server (192.168.1.101)]
    'netstat':
    tcp 0 0 192.168.1.101:22 192.168.1.3:33776 ESTABLISHED
    tcp 0 48 192.168.1.101:22 192.168.1.3:33777 ESTABLISHED
    'ps':
    4470 ? S 0:00 /usr/sbin/sshd
    4477 ? S 0:00 /usr/sbin/sshd

    The server shows two running instances because I had to open a second
    session to log in and run 'netstat' and 'ps'. Incidentally, that's
    exactly what I'm trying to avoid having to do. :-) Basically there
    should only be one single port 22 connection between the client and
    server at any given time.

    I can also remove the -N switch to the initial SSH command, and I'll get
    a full-blown login shell, but that doesn't appear to present any
    advantages.

    But forget about the port-forwarding. Let's make it even simpler with
    just this:

    [bozo@win98 C:\] ssh -N bozo@linux.box

    Now there's a session running. I want to re-use that session, and not
    authenticate again. Not even with public keys.
     
    > Download PuTTY and check out the documentation for pagent.

    It looks like pageant is an analogue of ssh-agent, so I don't think
    that'll help much. My private SSH keys don't even have a passphrase on
    them, so I don't have any need to cache the unencrypted version. And
    besides, ssh-agent is used to authenticate. I don't want to
    authenticate again and again (even it it's done automatically). I just
    want to re-use the same session that's open now and remains open.

    But I don't know if that's even possible with SSH... 

    -- 
No crazy stuff in my email. ;-)
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