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Network Security Secure-Shell
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Re: Detecting port forwarding on server-side.

Subject: Re: Detecting port forwarding on server-side.
Date: Fri, 20 Apr 2007 07:11:20 -0700 (PDT)
--- Ben Timby <btimby@gmail.com> wrote:

Hello, I am using openssh 4.5_p1.

Is there a way to detect on an sshd server when a
client has requested
port forwarding?

You can use lsof.  ie:

# lsof -ni |grep ssh

This will return a bunch of processes/ports, including
the destination and source ports being forward, and
who is doing the forwarding.

An example of what might be returned:

sshd    8455 turk182   10u  IPv4 3087293       TCP
10.16.0.11:45052->10.16.0.12:80 (ESTABLISHED)

User turk182 is building a port forward where the
source is 10.16.0.12, port 80.


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