Guide to configure squid, squidguard, https?

Cino

WPAD is the way to go.. There are ways around it but its the easiest to block pages HTTP/HTTPS without setting up MILM and dealing with certs.

KOM

WPAD is the way to go..

Yes, and it's simple. The only thing you have to do on each client is ensure the browser is set to automatic proxy detection, which is already the default on all browsers these days as far as I know. If you have a Windows AD structure then you can push down that setting through group policy if you wish. Configure WPAD, block 80/443 on LAN and then troubleshoot any stray users who suddenly have no web access.

https://doc.pfsense.org/index.php/WPAD_Autoconfigure_for_Squid

asterix

What about non- PC and non-Mac based clients? Like Smart TV, Blu-ray player etc. I use video caching.

KOM

If their network config supports a proxy then you're set. Otherwise, here is what I would do. I already would have blocks on LAN for ports 80 and 443 to force everyone to use the proxy by denying direct access. For the devices that don't support a proxy, I would add a rule just above the block rules allowing those IP addresses to talk directly on ports 80 and 443. So the devices go straight out, all other LAN clients get blocked and the only way they can talk is via the proxy.

marcelloc

@Cino:

WPAD is the way to go.. There are ways around it but its the easiest to block pages HTTP/HTTPS without setting up MILM and dealing with certs.

+1

thecableguy

Thanks for all the suggestions… I will look around for a good guide for WPAD configuration.

:)

KOM

I gave you the link for one in my previous post ;D

thecableguy

@KOM:

I gave you the link for one in my previous post ;D

Thanks, I did see that however I am not an expert like yourself ;), I was looking for a comprehensive guide from A to Z to configure WPAD..

Is this guide correct? :

http://irj972.co.uk/articles/pfSense-WPAD-PAC-configuration

Thanks

KOM

The guide I linked to was much easier for me to understand (I just did this whole exercise two weeks ago!) than the one you provided. Really, it's a lot easier than you think:

1. Login to pfSense via SSH and go to /usr/local/www
2. Create wpad.dat and stuff it with:

function FindProxyForURL(url,host)
{
return "PROXY Your.Proxy.IP.Address:3128";
}

3. Copy wpad.dat to wpad.da and proxy.pac to support other auto-discovery methods
4. Create a DNS entry for wpad and point it to your pfSense LAN IP
5. Create a DHCP Option 252 entry and point it to your pfSense WPAD URL: http://Your_pfSense_LAN_IP:Port/wpad.dat
6. Add LAN rules that block port 80 and port 43

Done.

Cino

Only problem with that setup, pfSense should be using port 443 for the WebGUI which means port 80 isn't listening anymore. I've had look results adding v-host and dropping the wpad files into that folder for hosting.

KOM

pfSense should be using port 443 for the WebGUI which means port 80 isn't listening anymore

And yet it works. It probably listens on both but only serves on the specified port.

Cino

@KOM:

pfSense should be using port 443 for the WebGUI which means port 80 isn't listening anymore

And yet it works. It probably listens on both but only serves on the specified port.

Port 80 is closed when I enabled https and is free for another process to use.

KOM

Actually, I'm a moron. While my test 2.2 box is HTTPS, my 2.1.5 box is HTTP. Yes, if you have WebGUI set for HTTPS then you will need another web server to host the WPAD files.

cwagz

Couple of questions:

So if I put the wpad.dat files on a virtual webserver on my network I could leave pfsense GUI on 443?

and

If Squid is used in normal mode does it filter HTTPS without having to do the man in the middle thing? I am trying to decide how to protect my kids as well…

Thanks
Chad

marcelloc

Chad, if wpad stays out of pfsense box(or at least out of default web server) you can leave it 443.

While using active proxy, you can filter https sites but not https urls without ssl interception.

cwagz

Thanks marcelloc,

I have gotten my setup working with wpad and was pretty happy but then found that minecraft would not use the proxy and failed to launch. I then setup a transparent proxy and everything works good but of course the kids can bypass the filter by going https. I then got https filtering working in transparent mode only to find that Minecraft won't buy my CA and therefore won't download it's package from Amazon.

Is there a way to have traffic out to a specic website not go through the ssl interception?
Anyone have a good solution?

Chad

KOM

When you have your proxy in standard mode (non-transparent), you typically use firewall rules to block access from LAN to ports 80 and 443. In your case, you want to add a rule above the block rule that specifically allows your Minecraft box to talk on 80/443 or whatever Minecraft uses for its updates.

marcelloc

While using transparent proxy, create a host alias with hosts/ips (not domains) you want to bypass the transparent proxy and then put this alias on squid general tab(bypass proxy to these Destination ips).

cwagz

I thought i tried putting s3.amazonaws.com in the bypass proxy to these destinations without affect. Is this the right format for the host alias?

The problem with the firewall rule for standard mode is I would end up bypassing all of my kids computers from being forced through the proxy. I did find something about launching minecraft via a shortcut to define the proxy so I may go back to trying standard mode if i cannot get the launcher to work with ssl interception. So far I have installed my cert on all of our phones and machines and the transparent proxy is working really well. It just seems to be minecraft that is causing problems.

Thanks for the help.

Jambro1964

I used GPO to push the cert to all domain computers, the pain was all the BYODs and had to manually import the cert. I just stuck it on the internal webserver and gave all instructions to get to it and import it. Wasn't that bad.

My problem now is that Squid has problems with https sites that are using TLS 1.2. Any one know how to fix that in the Squid-dev so I can continue to use MitM?

Thanks,

Jim