Guide to filtering web content (http and https) with pfsense 2.3

aGeekhere

Ok done some research squidclamav only supports http not https because it is encrypted.

would you know how to get the below google safesearch info in pfSense BIND DNS?

Not sure you will need to ask that in the proxy forum.

AR15USR

@aGeekHere:

Ok done some research squidclamav only supports http not https because it is encrypted.

I just did a test. Squidclamav will scan https traffic when using Squids MITM option..

asterix

@AR15USR:

@aGeekHere:

Ok done some research squidclamav only supports http not https because it is encrypted.

I just did a test. Squidclamav will scan https traffic when using Squids MITM option..

And that would need certificates have to be installed on the clients..

AR15USR

@Asterix:

@AR15USR:

@aGeekHere:

Ok done some research squidclamav only supports http not https because it is encrypted.

I just did a test. Squidclamav will scan https traffic when using Squids MITM option..

And that would need certificates have to be installed on the clients..

Correct.

aGeekhere

To help stop virus or spywhere we can enable squidguard block list blk_BL_spyware,

johnpoz

What is the point of all the safesearch nonsense and redirecting users to only use your dns.. You do understand when a proxy is being used, the proxy does the query not the client..

phunni

While setting up wpad we'r supposed ot enter the following into /usr/local/www/wpad.da:

function FindProxyForURL(url, host)
{
if (isPlainHostName(host) ||
shExpMatch(host, "*.local") ||
isInNet(dnsResolve(host), "192.168.1.0", "255.255.255.0"))
return "DIRECT";

return "PROXY 192.168.1.1:3128";
}

I've actually changed my pfsense server ip to 192.168.0.1 - do I need to edit both ip addresses listed above?

AR15USR

@johnpoz:

What is the point of all the safesearch nonsense and redirecting users to only use your dns.. You do understand when a proxy is being used, the proxy does the query not the client..

I think the point of the safe search is to stop, say your young kids, from Googling porn images. I'm not sure about the dns redirecting.

aGeekhere

@AR15USR:

@johnpoz:

What is the point of all the safesearch nonsense and redirecting users to only use your dns.. You do understand when a proxy is being used, the proxy does the query not the client..

I think the point of the safe search is to stop, say your young kids, from Googling porn images. I'm not sure about the dns redirecting.

1. What is the point of forcing search engines from using safe search?
Answer: To aid in the filtering of adult content, this is most importantly for google images as squidguard does not block them, if you do not want to filter web content then this guide is not designed for you.

2. What is the point of redirecting users to use THEIR pfsense router as the DNS server.
Answer: There are many advantages not all relating to web filtering however tries and stops the user from bypassing the dns redirect rule.

@phunni:

While setting up wpad we'r supposed ot enter the following into /usr/local/www/wpad.da:

function FindProxyForURL(url, host)
{
if (isPlainHostName(host) ||
shExpMatch(host, "*.local") ||
isInNet(dnsResolve(host), "192.168.1.0", "255.255.255.0"))
return "DIRECT";

return "PROXY 192.168.1.1:3128";
}

I've actually changed my pfsense server ip to 192.168.0.1 - do I need to edit both ip addresses listed above?

Yes, set it to 192.168.0.0

AR15USR

I'm constantly getting these entries in the Squid Real Time log:

01.07.2016 06:06:34	192.168.1.5	TCP_DENIED/403	127.0.0.1:59488	-	-
01.07.2016 06:06:34	192.168.1.5	TCP_DENIED/403	127.0.0.1:55735	-	-
01.07.2016 06:06:34	192.168.1.5	TCP_DENIED/403	127.0.0.1:49806	-	-
01.07.2016 06:06:34	192.168.1.5	TCP_DENIED/403	127.0.0.1:46365	-	-
01.07.2016 06:06:34	192.168.1.5	TCP_DENIED/403	127.0.0.1:38156	-	-
01.07.2016 06:06:34	192.168.1.5	TCP_DENIED/403	127.0.0.1:25012	-	-
01.07.2016 06:06:34	192.168.1.5	TCP_DENIED/403	127.0.0.1:24866	-	-
01.07.2016 06:06:33	192.168.1.5	TCP_DENIED/403	127.0.0.1:14826	-	-
01.07.2016 06:06:33	192.168.1.5	TCP_DENIED/403	127.0.0.1:10196	-	-
01.07.2016 06:06:33	192.168.1.5	TCP_DENIED/403	127.0.0.1:6263	-	-

192.168.1.5 is my local machine. Is this normal?

Update: Resolved this in another thread..

phunni

To stop users from bypassing your proxy setup a new firewall lan rule and block port 80 and 443

Just to clarify - this is to prevent users from bypassing the proxy altogether, rather than just bypassing the autoproxy/wpad stuff?

phunni

The Squid Guard settings aren't working for me. I download the blacklist and then go to Common ACL (I've already completed the target categories step on a previous run through), but the "Target Rules" only contains "^whitelist all" and there are only [whitelist] and Default access [all] options there.

On another point, I don't want to have to set up auto proxy for every device connecting to my network - would it work if I use transparent proxy and then explicitly set the https_proxy on the couple of machines I really need locked down?

aGeekhere

@phunni:

To stop users from bypassing your proxy setup a new firewall lan rule and block port 80 and 443

Just to clarify - this is to prevent users from bypassing the proxy altogether, rather than just bypassing the autoproxy/wpad stuff?

If port 80 and 443 are lefted open then the user can simply untic the auto configure proxy (on their PC, Mac, phone etc) and set the setting to go direct. This will not call for the wpad and the user will go direct and not use the proxy.

@phunni:

The Squid Guard settings aren't working for me. I download the blacklist and then go to Common ACL (I've already completed the target categories step on a previous run through), but the "Target Rules" only contains "^whitelist all" and there are only [whitelist] and Default access [all] options there.

On another point, I don't want to have to set up auto proxy for every device connecting to my network - would it work if I use transparent proxy and then explicitly set the https_proxy on the couple of machines I really need locked down?

1.With squidguard set default access to allow then set the categories you want to deny. Save and then go to squidguard General settings and hit apply. Please read the tip under this section it is very important.
Read this https://doc.pfsense.org/index.php/SquidGuard_package

2. Transperrent proxy does not use a wpad, if you want to use transperrent proxy for http then you need SSL Man In the Middle Filtering for https which must have a certificate installed on evey device.

So you can either set auto configure proxy on all devices or install a certificate on all devices.

You cannot use a transperrent proxy and a wpad at the same time. If you did get a transperrent proxy with SSL mitm working then there is no need for manual proxy mode.

phunni

@aGeekHere:

1.With squidguard set default access to allow then set the categories you want to deny. Save and then go to squidguard General settings and hit apply. Please read the tip under this section it is very important.
Read this https://doc.pfsense.org/index.php/SquidGuard_package

That was the problem - there were no other categories than whitelist and default access. I managed to get the others by enabling "Blackilist" under the general settings of Squid Guard. Forgive me if I just missed it, but I couldn't see that step in the guide.

aGeekhere

I added
In squidguard under General settings
Tic enable
Tic Enable log
Tic Enable log rotation
Tic enable blacklist
Under Blacklist URL add http://www.shallalist.de/Downloads/shallalist.tar.gz
Save
apply (you must always hit apply for any changes you made to squidguard).

aGeekhere

I found this post and I am researching to see how well it will work.

https://forum.pfsense.org/index.php?topic=106016.0

The idea is to use the wpad for https content and have a transperrent proxy for http traffic. This could remove the bypass rules for programs with no proxy settings and need to use port 80.

Update
OK it looks to be working fine, now all the traffic that was block on port 80 is now using the transperrent proxy, you will still need a pass rule for port 443 but not for port 80.

So you can use the wpad for http and https filtering (or for just https) and enable the transperrent proxy to catch the leftovers.

phunni

Just to point out that this approach does not play well with many Roku channels - at least on my Roku 3 anyway.

Forcing youtube to be restricted causes all videos to fail on the Roku app.

The step " Do not allow IP-Addresses in URL" breaks Netflix.

There is also something that breaks the ITV Hub channel - although I haven't figured out what yet. My experiments suggest that it's something to do with Squid, but probably no squid guard.

The Roku remote is also somewhat less reliable in connecting after a reboot of the Roku, although I'm surprised at that, because I thought the Roku used it's own wifi to connect to the remote independently of the main network.

I'm not saying all this because I'm asking for fixes (although any suggestions that might provide fixes would be useful), but as information for anyone setting this up who has a Roku on their network.

I'm still, largely, using this approach, although, obviously, it's somewhat weaker than it would be if I didn't have to make compromises to get my Roku working.

aGeekhere

Bypass the proxy for Roku and Netflix.

wifiuk

So i have got wpad all working fine using some other guides, everything goes via the autodisovery and all is good.

That is except android devices. They are not allowing auto wpad config, and i'm not setting them all up one by one.

If i set a firewall rule to block 80 - 443 on the LAN it works, and all the devices work except the android devices, which is what i expect to happen.

What i want to do is redirect all 80 - 443 requests to the squid port 3128.

But i have read somewhere that as my squid is the same ip as firewall and same subnet as lan it will cause some redirect loops.

Can someone advise me the best way to force all android traffic via squid without manually setting up each device..

aGeekhere

That is except android devices. They are not allowing auto wpad config, and i'm not setting them all up one by one.

Manual setup is the only way I got it to work for android (5.1) and for older versions manual setup is the only option.

Try enabling transperrent proxy with the wpad, this will help with port 80 getting blocked.

But i have read somewhere that as my squid is the same ip as firewall and same subnet as lan it will cause some redirect loops.

I have read that too (never tried) might be your best option.

Or just get your users to setup the proxy?