Extra OpenSSH logging for tracing SSH connections and tunnels

[Chris Rapier]

Take a look at ISSHD https://github.com/set-element/openssh-hpn-isshd

It has a lot of logging but it is intrusive. I haven't played with it 
much but I know the dev and I know it's been deployed at the SDSC (sand 
Diego Supercomputing Center). I believe it feeds data directly in bro 
(see https://github.com/set-element/isshd_policy). Note: Scott rolled 
HPN-SSH into it as well and It might be complicated to extract that 
merge. I might be able to do it as I think I have access to an earlier 
version of ISSHD if that's important to you.

This will at least get you to the server side logging. If it doesn't 
instrument the client as well this might give you the basis to do that.

On 4/24/26 10:07, Zoltan Fridrich via openssh-unix-dev wrote:
> Hello
> 
> I have a use-case where I need to be able to trace SSH connections and
> tunnels for traceability and security compliance purposes.
> More specifically, I need to be able to:
> - log every outgoing SSH connection on the client side including user ID
> and command details
> - log every SSH tunnel on the server side including source, target, ports
> and user ID
> 
> Would such extra logging be acceptable for inclusion in the upstream code?
> 
> I have attached a patch that implements this extra logging.
> 
> Regards,
> Zoltan
> 
> 
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