Hi Jan,

From: Jan Just Keijser [mailto:[email protected]]
Sent: donderdag 19 juni 2014 16:28
To: Witvliet, J, DMO/OPS/I&S/HIN; [email protected]
Subject: Re: [Openvpn-users] http-proxy

Hi Hans,

On 19/06/14 16:07, [email protected]<mailto:[email protected]> wrote:
Hi all,

Just visited another ministerial department, where the also might using or 
openvpn-set-up.
As predictable, a whole new list of challenges ...

One of them is related to the use of http encapsulation:

At the a client you can configure that all traffic should go to 
proxy.company.org,  port 443
And that its content should go to vpn_node_22.company.org, tcp port 5000.

But what if you also want:
Some content should go to vpn_node_22.company.org, tcp port 5010.

So, Is it possible to configure a reversed-proxy like apache or squid to 
support multiple different destinations?
What I've seen so far from the docu, is that they sort-off rewrite the 
http-header

I am not sure if I understand your question:

if a http proxy is used to restrict or redirect client access , then the http 
proxy server can make decisions based on the incoming request, e.g.

1) clientA wants to connect to site 
www.example.com:443<http://www.example.com:443>
2) clientA connects to the proxy first, request a 'CONNECT 
www.example.com<http://www.example.com> 443'
3) http proxy server grants access, or might even direct access to a different 
host
4) clientA talks via the http proxy with (what it think is) the remote server

OpenVPN works at the routing level, so a similar scheme would have to be 
achieved using routing. It is not possible to redirect clients to different 
hosts based on port numbers, but as long as src ip + dest ip are 
distinguishable then you can route traffic any way you like (on the openvpn 
server).

Does this answer your question? if not, then please elaborate.

Partly.....
Imagine two clients, client-A and client-B
They BOTH connect to site www.example.com:443<http://www.example.com:443>
But in the config of client-A it indicates to openvpn server openvn.example.com 
1500 tcp
and in the config of client-B it indicates to openvpn server openvn.example.com 
1510 tcp
So, both users share the same proxy, but should end up on different 
vpn-servers...

Hans


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