Lately I've been looking at scanning web content that passes through my Linux gateway box (SNAT). I'm currently running openSUSE 10.3, using iptables to do the SNAT. I really love iptables and what it is able to do.

But virus scanning... I was thinking about setting up Squid, and then using Virulator to scan proxied data through something like ClamAV (i.e. virulator bridges the gap between Squid (proxy) and the Virus scanner (ClamAV)).

I've looked at some solutions like Untangle or Endian, and considered them, but don't like them. They feel really awkward and clumsy to me (especially Untangle). The other thing is, I am very familiar with SUSE distros, and I know SUSE runs on my hardware. So I'm sorta reluctant to switch.

But one thing that Endian can supposedly do is scan traffic on port 80 without actually setting up a proxy on the gateway machine. So it simply scans content passing through the machine that goes over that port.

So I guess what I'm asking is there something like this (ability to transparently scan web traffic that passes through this box) that can run on a regular distro like openSUSE? If proxy is necessary, is there something better out there than a Squid+Virulator solution?

Why can't you run squid as a transparent proxy and use a squid based solution?

I didn't know Squid could run as a transparent proxy...

To be honest, I've never run Squid. I know it's considered a very high caliber product, and I've been seriously looking at it. I'm simply trying to find the most effective solution that isn't going to be highly difficult to get working that'll be the most seamless solution to the users involved.

But doesn't Squid need a "middle man" to a virus scanner, much like Amavis is to Postfix and ClamAV?

I think do - there are products like squid-clamav around. Do a bit of googling

The 2.9.x.y branch of DansGuardian has built-in virus scanning support.

Also maybe have a look at HAVP, which can be used standalone.