Python reverse proxy connection

Question

I'm trying to make a HTTP/S proxy server work without having to manually port forward.

Machine A has installed a proxy server
Machine A is behind a NAT (or a router with firewall).
Machine B tries to browse internet through Machine A proxy.
Machine B isn't behind a NAT.
Both machines know each other before any connection is made.
In a full scale, there would be multiple Machine A but only one Machine B.

Machine A shouldn't need to configure anything on the router.

I have thought about using uPnP, as per this answer, but as the title of this question, I wanted to know if it would be possible to invert the roles of the machines.

Instead of Machine B initiating a connection, Machine A will do it. So Machine A would be the client and Machine B would be the server. Remember Machine A knows the IP address of Machine B beforehand.

In this scenario, Machine A would still function as a proxy, but having the role of the client in a standard TCP connection.

I understand this would need a custom-made proxy server, which is no problem since the proxy server is implemented in python and I have access to the source, and can modify it.

Will this be compatible with normal HTTP/S proxy? Specifically I will be using python requests on Machine B.
Does this method have a name? Researching for inverse or reverse lands me on reverse proxy which AFAIK doesn't have anything to do with what I'm trying to accomplish.
Is there something I'm missing? Or an alternative solution? (besides uPnP)

why you want write on your own? there are numbers of proxy choices. — georgexsh
– georgexsh, Commented Sep 30, 2017 at 18:21
I don't want to write my own. If there's a solution that works that's fine with me. — Jorjon
– Jorjon, Commented Sep 30, 2017 at 18:51

georgexsh · Accepted Answer · 2017-10-04 19:12:44Z

1

a simple solution is OpenSSH port forwarding.

first forward port 20000 on "Machine B" to port 10000 on "Machine A" with remote port forwarding:

[A]$ ssh -N -R 20000:localhost:10000 Machine_B

then setup a tunnel on port 10000 on "Machine A" with dynamic port forwarding:

[A]$ ssh -N -D 10000 localhost

now you can use 127.0.0.1:20000 as a SOCKS5 proxy on "Machine B":

[B]$ curl --socks5 127.0.0.1:20000 example.com

edited Oct 4, 2017 at 19:12

answered Oct 3, 2017 at 9:29

georgexsh

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ewwink · Accepted Answer · 2018-07-27 04:17:38Z

0

it called "Reverse", you need shootback to reverse TCP tunnel, it work like OpenSSH port forwarding and Socks5 proxy server like pysocks it better than HTTP/S proxy server.

on MachineB (You)

python3 master.py -m 0.0.0.0:10000 -c 0.0.0.0:10800

on MachineA (Remote)

python socks5.py start --port=1080
python slaver.py -m <MachineA_IP>:10000 -t 127.0.0.1:1080

now on MachineB you can set browser or any app to socks5

localhost:10800

answered Jul 27, 2018 at 4:17

ewwink

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