Question

How to setup iptables rule to redirect all outbound http/https requesets to Symantec Web Security software operating on another server

Asked by: jrbeac1

How can I setup iptables rule to redirect all outbound http/https requesets to Symantec Web Security software operating on another server? I have a client with two gateways to the Internet. One is a linux box with iptables rules setup. The other is a Windows server. Currently, the former is setup to act as the internal users gateway to the Internet. The latter is setup for roaming users to VPN into the network. The client wants to setup Symantec Web Security software on this Windows server. The documentation for that product indicates that each client must be reconfigured to use the server running Symantec as its gateway. It seems to me that a naughty user could simply reset that and bypass the Security rules. Which leads back to my question, how can I setup the linus box to redirect all outbound http/https traffic to that other Security server?

thanks in asvance,

jack

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Asked On
2006-07-26 at 12:45:58ID21933012
Tags

iptables

,

redirect

,

traffic

,

http

Topic

Linux Network Security

Participating Experts
1
Points
500
Comments
4

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Answers

 

by: slyongPosted on 2006-07-26 at 19:09:09ID: 17189691

Hi Jack,

The information that you need is here (http://www.faqs.org/docs/Linux-mini/TransparentProxy.html#s6).  However, I think you can simply use:

-A MYRULES --dport 80 -j REJECT
-A MYRULES --dport 443 -j REJECT

to stop all users from using the Linux box as gateway, and add exception rules for IPs that you want to allow.

 

by: jrbeac1Posted on 2006-07-27 at 03:59:23ID: 17191531

Slyong,

Thank you.

I won't have an opportunity to test this until next Wednesday, August 2. After I do so I'll reward you points.

Parsing the rule it appears that the traffic will simply halted. Yes? Or can this redirect traffic to server running the Symantec software. I guess I'm looking for something like:

-A MYRULES -dport 80 -j REDIRECT 192.168.1.2 (where REDIRECT is psuedo command I just made up, as is the IP address of the second server)

Thanks for your prompt assistance.

Jack

 

by: slyongPosted on 2006-07-27 at 04:13:02ID: 17191590

Hi Jack,

Something like:

    * iptables -t nat -A PREROUTING -i eth0 -s ! Symantec-box -p tcp --dport 80 -j DNAT --to Symantec-box:80
    * iptables -t nat -A PREROUTING -i eth0 -s ! Symantec-box -p tcp --dport 443 -j DNAT --to Symantec-box:443
    * iptables -t nat -A POSTROUTING -o eth0 -s local-network -d Symantec-box -j SNAT --to iptables-box
    * iptables -A FORWARD -s local-network -d Symantec-box -i eth0 -o eth0 -p tcp --dport 80 -j ACCEPT
    * iptables -A FORWARD -s local-network -d Symantec-box -i eth0 -o eth0 -p tcp --dport 443 -j ACCEPT

is what you are looking for if you want to redirect the traffic.  It is explained in the above url that I gave.

 

by: jrbeac1Posted on 2006-07-27 at 05:25:09ID: 17191984

Slyong,

Thanks again. I'll take your word for it -- as I won't be in a position to try it out until next week.

Thanks,

Jack

20120131-EE-VQP-002

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