Re: Have socks proxy working with libssh

[Alberto Garcia <agarciaillera@xxxxxxxxx>]

Hi,

Let me try to explain:

My code uses libssh to create a client and a server within the same binary.
In machine A I run my tool:
- The client part creates a reverse ssh tunnel against a regular OpenSSH
server in machine B.
- The server part listens in a port (lets say 1234) and the tunnel created
with machine B forwards everything to the server part of my tool (at port
1234).

Basically I just do a reverse tunnel. That works great and at machine A I
can do `ssh -p [binded_port] localhost` and I get a shell in machine B
(just like a regular reverse ssh tunnel).

The problem is that I would like to use dynamic port forwarding so in
machine A I can run  `ssh -p [binded_port] -D 0.0.0.0:11223 localhost` and
creating a SOCKS5 proxy. That is what is not working. A new socket listens
at 0.0.0.0:11223 at machine A but I can't for example browse the internet
using that socket.

My understanding is that a new channel should be created every time that I
try to reach a different IP:PORT using the socks proxy, meaning that if I
use the SOCKS5 proxy to browse the internet I will get a new channel per
every new web site I visit.

Did this further info helped?

Thanks in advance.

On Wed, Jan 23, 2019 at 1:54 PM <g4-lisz@xxxxxxxxxxxx> wrote:

> I don't really understand what you are trying to accomplish. Your libssh
> client/server create a tunnel, and through this you run a another SSH
> tunnel for SOCKS, using an OpenSSH client? Why you don't connect to the
> server directly?
>
> Turn on debugging on both sides and look for socket faillures or similar...
> On 23.01.19 21:01, Alberto Garcia wrote:
>
>
> the problem is that using that tunnel as a SOCKS proxy doing  ssh -p
> [port] -D 0.0.0.0:11223 localhost does not work. It does create a
> listening socket at port 11223 but when I set that port and IP on my
> browser to browse the internet it does not work.
>
>

-- 
Alberto García Illera

GPG Public Key <https://goo.gl/yshdwh>