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I'd like to set up a tunneling proxy accessible by URL--so, to access bar.com through the tunneling proxy, you'd go to foo.com/bar.com and continue to browse bar.com transparently from there. I can either set up an SSH tunnel or a VPN connection that I'd like to expose. How can I set up squid (or another proxy server) to route requests through an SSH/VPN connection like this?

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2 Answers

First, Setup your ssh tunnel

ssh you@yourproxysever -L8080:localhost:8080

Leave this connection running, this assumes that your proxy server is listening on port 8080.

Second, Setup your web browser to use localhost:8080 as its proxy server

The ssh tunnel will forward packets to your proxy server over ssh.

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Use ssh -fN ... to make it drop into background after connecting. –  grawity Feb 28 '10 at 11:24
    
Ohh, good point, I hadn't used that one. –  Dave Cheney Feb 28 '10 at 20:12
    
Awesome; thanks! How can I use this to expose that publicly? I'm not exactly clear on how I would set up a webserver to receive a request (say, on 80), forward it to the SSH tunnel, and pass the response back. –  aresnick Mar 1 '10 at 15:58
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Not quite clear about what you need. But if you need to route web packets over SSH via a proxy, you can use SSH in SOCKS mode (-D) and use something like Privoxy in SOCKS mode to route it. So the connection would look like this:

[browser]---[privoxy proxy]---[ssh socks]---[remote machine]---[web server]

However, if you want to route traffic to a proxy via a SSH tunnel, you can use SSH in tunnel mode (-L) to route it something like this:

[browser]---[ssh tunnel]---[proxy on remote machine]---[web server]
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So what I'd like to do is something like: [browser]---[my webserver]---[ssh tunnel]---[proxy on remote machine]---[remote web server (whatever resource the user requests] –  aresnick Mar 1 '10 at 16:00
    
To finish that comment: it's not clear to me how to do that =) –  aresnick Mar 1 '10 at 16:00
    
In that case, your webserver would need to function as a reverse proxy with an upstream proxy configuration. You might be able to do it with some squid magic but I have a feeling that you will need to write your own server. –  sybreon Mar 2 '10 at 1:19
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