Hi Mark

In case it is helpful for your situation what we do is as follows:

We use 1 box as a sort of SBC, where we do all our IP authentication and then we route the call through to various call processing boxes using the kamailio dispatcher module.

On our dispatcher box we test the ip and from uri as a pair of the connecting party via the allow_trusted function and then on the callprocessing boxes we make sure the messages are coming from the dispatcher box via the allow_source_address function. user credentials authentication is passed through from the dispatcher to the callprocessing box in our set up.

Using the dispatcher module all our sip traffic first passes through the dispatcher (which sounds similar to what you want to accomplish I believe).

Here are the 2 modules I mentioned above:

http://kamailio.org/docs/modules/3.1.x/modules_k/dispatcher.html

http://kamailio.org/docs/modules/3.0.x/modules_k/permissions.html

This a fairly basic set up we have so hopefully you can put together something similar if it suits your needs.

All the best.

Will Ferrer

On Tue, Dec 10, 2013 at 2:39 AM, Mark D. Montgomery II <techiem2@techiem2.net> wrote:

Here's the issue:
I have a FreePBX server running at a location that
1. Is not directly accessible from all the outside locations I would be at
2. I don't want the SIP ports directly open to it from the whole world anyway for security reasons.

I have a VPS that I am currently using as a pure SIP redirector via firewall rules, and the main location allows connection from the VPS only.

The issue I've run into (which is the same issue as having the main server open to the world), is that I still get a fair number of exploit hits to the server.

What I'd like to do is use Kamailio as an authenticating proxy so I could use fail2ban on the VPS to ban the offenders when they try to exploit the server.
Basically I want Kamailio to handle passing authentication back and forth from the client to the actual server and then handle proxying the full connection when the auth is correct.

Is this doable?
If so, how would I go about setting it up?
It looks like Kamailio should be able to do just about anything, but I don't know where to start.

Thanks.

Mark II

--
Mark D. Montgomery II
http://www.techiem2.net

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