Feature/allow AllowTcpForwarding

[benasse]

Hello shellhub developers,

First of all, thank you for this great project, it answers a real need when you have to connect to various linux machines distributed in non mastered network environment.

A feature that I was missing to be able to use shellhub in my ecosystem is the ability to perform port forwarding.

Other people have reported this need here: #90

I took the time to examine the code and make this feature work.

With this pull request it is possible to connect with ssh to a device and specify a port forwarding like this:

ssh user@<shellhub_device>@<shellhub_host> -L 0.0.0.0:42667:192.168.8.13:443

What do you think of it?

[benasse]

After some testing, this PR would allow this functionality: #513

I don't have a test environment to be sure, but it may have an impact on : #327 and #489

[gustavosbarreto]

@benasse I'm traveling to the GopherCon Brazil right now. I will look into it as soon as possible.

[benasse]

Thanks for the feedback, have a nice trip and a good GopherCon !

[gustavosbarreto]

@benasse Thanks for implementing this. It will be very useful for many use cases.

LGTM

[whyameye]

How can I use this added feature to implement X11 forwarding specifically?

[benasse]

As far as I know, X11 forwarding uses a unix socket, which is not currently supported by shellhub.