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OpenVPN Security Question

post #1 of 9
Thread Starter 
Hi,

I've got my OpenVPN server up and running and can connect fine from the internet.

The problem is, some of the sites I need to connect from only allow connections from

TCP/80 (HTTP)
TCP/443 (HTTPS)
UDP/53 (DNS)

So I need to change the servers listening port to one of the above, ok no worries, done, I'm using 443 and it works.

Now, my question. From a security perspective, would it be better to run it on 53/UDP?

After all, it's a lot easier to port scan for active TCP services (due to the hand shake) rather than UDP ones.

Also, the stateless nature of UDP should yield better performance too.

Opinions...
    
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post #2 of 9
Quote:
Originally Posted by dushan24 View Post

Hi,

I've got my OpenVPN server up and running and can connect fine from the internet.

The problem is, some of the sites I need to connect from only allow connections from

TCP/80 (HTTP)
TCP/443 (HTTPS)
UDP/53 (DNS)

So I need to change the servers listening port to one of the above, ok no worries, done, I'm using 443 and it works.

Now, my question. From a security perspective, would it be better to run it on 53/UDP?

After all, it's a lot easier to port scan for active TCP services (due to the hand shake) rather than UDP ones.

Also, the stateless nature of UDP should yield better performance too.

Opinions...

What's running your OpenVPN box? You can mitigate port scans fairly easily with iptables or a similar solution.
I believe OpenVPN recommend using UDP - so I'd say use UDP, and switch to TCP if you have any problems.
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post #3 of 9
Thread Starter 
Quote:
Originally Posted by tompsonn View Post

What's running your OpenVPN box? You can mitigate port scans fairly easily with iptables or a similar solution.
I believe OpenVPN recommend using UDP - so I'd say use UDP, and switch to TCP if you have any problems.

It's running on my pfSense box.

I have Snort and pfBlocker working, I'm just paranoid :-)

I'm glad you agree with me about UDP
    
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post #4 of 9
Quote:
Originally Posted by dushan24 View Post

It's running on my pfSense box.

I have Snort and pfBlocker working, I'm just paranoid :-)

I'm glad you agree with me about UDP

I wouldn't worry too much - plenty of much bigger networks out there worth targeting for a port scan (and many are, that don't take measures to prevent it).

Indeed. Well give it a shot. Lucky they're only filtering by port number and not doing packet inspection for the protocol tongue.gif
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post #5 of 9
Thread Starter 
Yeah, if they were doing DPI I'd be in some trouble.
    
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post #6 of 9
Thread Starter 
UPDATE: 53 causes a conflict with the DNS forwarder, so my choices are now narrowed to 80 and 443 (TCP)

I'm gonna just keep using 443 and be done with it

Unless...

Does anyone know how I could get 53 to work.

I've tried port sharing (http://doc.pfsense.org/index.php/Sharing_a_Port_with_OpenVPN_and_a_Web_Server) and that didn't work.
    
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post #7 of 9
Quote:
Originally Posted by dushan24 View Post

UPDATE: 53 causes a conflict with the DNS forwarder, so my choices are now narrowed to 80 and 443 (TCP)

I'm gonna just keep using 443 and be done with it

Unless...

Does anyone know how I could get 53 to work.

I've tried port sharing (http://doc.pfsense.org/index.php/Sharing_a_Port_with_OpenVPN_and_a_Web_Server) and that didn't work.

I don't think you can apply port sharing with UDP redface.gif
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post #8 of 9
Thread Starter 
Quote:
Originally Posted by tompsonn View Post

I don't think you can apply port sharing with UDP redface.gif

Neither do I. I believe it's a TCP thing and it works by keeping track of the various states and where they initiated.

I'm looking for another answer :-)

+REP for effort though
    
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post #9 of 9
Quote:
Originally Posted by dushan24 View Post

Neither do I. I believe it's a TCP thing and it works by keeping track of the various states and where they initiated.

I'm looking for another answer :-)

+REP for effort though

That would sound about right - TCP overhead is good for something huh? tongue.gif
I hope you can figure out how to put it over port 53. If you do, I'd like to know the answer smile.gif
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