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

[bwlinux]

Thanks aGeekHere!  This guide encouraged me to revisit HTTPS filtering for several of my sites.

The WPAD options seems great for PCs but didn't work well on Android devices.  Things get really difficult when you have 2 or more network interfaces you want to proxy/filter using WPAD.

In the end, I just set up transparent proxy for both http and https. Creating a CA on the firewall and then assigning that in Squid for the CA along with "Splice All" for SSL/MITM Mode works great!

I think it's been mentioned before but your guide would really benefit from having 2 completely separate sets of instructions for transparent only and WPAD only.

[aGeekhere]

I now recommend that you use both, WPAC as the default and transparent with splice all as backup. So software that has no proxy settings still get redirected to the proxy in stead of getting blocked by the firewall rule 80 443. For android you can manually set the proxy, sometimes splice all can show SSL errors when web browsing. I will clean up the guide when I have time.

[minhgi]

After using the guide and having everything setup correctly, I noticed pfblockerng easy_list stop blocking ads.  Have anyone have this issue and know how to fix it?

[vielfede]

@aGeekHere:

sometimes splice all can show SSL errors when web browsing.

I'd say "often" a  lot of SSL errors!  ;)
In my opinion Splice All is not usable in the way it is now (without WPAD).

[originalsin]

guess it is way too late for asking abbration.

But what does "Tic" stands for?

I can not find out the Tic in Pfsense and can not figure it out.

Plz somebody help me!!!

[aGeekhere]

Tick, select.

[yaska]

I have multiple vlans with different IP addresses

VLAN_50 = 192.168.50.0
VLAN_60 = 192.168.60.0

How do I add all the IPs to the below section

function FindProxyForURL(url, host)
{
    if (isPlainHostName(host) ||
        shExpMatch(host, "*.local") ||
        isInNet(dnsResolve(host), "192.168.60.0",  "255.255.255.0"))
        return "DIRECT";

return "PROXY 192.168.60.1:3128";
}

[shan52]

Why is the difference between Squiguard and OpenDNS?

[vielfede]

Just one thing I can not get working:

Windows 7 updates, W7 detects them, but it's not able to download. I read something about here, but I do not know how to manage it.
https://wiki.squid-cache.org/SquidFaq/WindowsUpdate#Squid_with_SSL-Bump_and_Windows_Updates

Anyone with the same problem?
Solutions? Workarounds?
Thanks in advance

[shan52]

We have lots of laptop and pc, is there an easier way to install the cert for all the devices?

[aGeekhere]

I have multiple vlans with different IP addresses

I do not use vlans so I do not know, sorry

Why is the difference between Squiguard and OpenDNS?

Squiguard block content on rules you set on your router (totally private).
OpenDNS block content on rules you set on their servers (they see all traffic, also can be slower)

Just one thing I can not get working

Windows updates (as well as Mac and linux) should all be working, if it is not that you may have missed a step. Check that the WPAD is working and your pc is set to auto configure.
If it is still not working read though the guide again, it should work.

We have lots of laptop and pc, is there an easier way to install the cert for all the devices?

You only have to create a cert of squid when using splice all not for all devices

Hope this helps

[DerHeldvomErdbeerfeld]

Hi there,

I just read this guide and also tried a little bit an the most I tried worked. Now I just have some
questions for better understanding.

@aGeekHere:

Guide to filtering web content (http and https) with pfsense 2.3 updated 09 June 2017

To stop users from bypassing your proxy setup a new firewall lan rule and block port 80 and 443
IPv4 TCP * * * 80 - 443 * none.
Save

If I set it up like this FROM 80 TO 443 (this is what it mean to me 80-443) didnt I block also all ports
between 80 and 443? Wouldnt it be better to set up two rules or an alias (Firewall/Aliases/Ports)
for the pot 80 and 443 or did I understood it wrong?

I also want to use a dual wan configuration, is there something to take care of?

–-
greets from Germany

DerHeldvomErdbeerfeld

[aGeekhere]

hi
1. I created two rules, one for port 80 and one for 443 (I will update this part of the guide)

2. I do not think squid works on dual wan

[Tecnergy]

Hi, thanks for this guide it has helped me a lot, bear with me pls no bully, I just installed pfsense

"the wpad will be setup to use port 80 and 443. The transperrent proxy is going to catch every thing that the wpad misses, enable transperrent proxy in squid once you have the wpad setup."

shouldn't be "the proxy will be setup…"?

Guide is missing configuration of mime type, I don't know which file to edit. I've read other guides and most of them say something about adding mime types for .da, .dat and .pac (if it's not there already)

Anyways, my problem is that I cannot download the files so no HTTPS filtering for me. I've made a folder inside www called wpad "www/wpad"
I cannot reach wpad.mydomain.local/wpad/wpad.da nor any other. Ping to wpad.mydomain.local responds to firewall IP

It's probably something dumb like a firewall rule but I can't see it.

-I have changed access to GUI to port 9999 and HTTP
-squid and squidguard services up
-with MiTM enabled I can't access HTTPS sites (because no downloading of proxy files I guess)
-Im running pfblocker too
-pfsense is my DHCP and DNS server
-have two WAN (I've read it squid proxy doesn't work with dual wan but it is blocking http OK like this)

Can you help me to realize whats wrong with the downloading of files for wpad?

thanks.

[Tecnergy]

Hi,

I managed to make it work by implementing another recurrent instance of nginx following another guide I found on the internet (I don't know if I'm allowed to post external links so I won't).

it seems to be working so far with 2 WAN's in load balance mode and it is filtering both http and https it seems with out MitM.

Thanks!

[J7529]

Hello,

Just following the Guide, I am getting a issue where when searching on https i get "This site can't be reached" and when browsing on http I get "The requested URL could not be retrieved" I am only trying to get to Google which is let through!

How I am currently setting up is behind a Router/Firewall and we already have a DNS server so I haven't enabled DNS Resolver, would this cause issues?

Thanks!

[MartinN]

@aGeekHere:

Go to Services/DNS/Resolver/General Settings
in custom option enter

server:
include: /var/unbound/forecegoogle.conf

You have mis-spelled the filename here, which prevents it from being saved by pfSense. Please fix it  8)

Thanks for the guide, excellent stuff!

[aGeekhere]

Fixed spelling

[nib01]

@nib01:

I got confused when you say add (blue). Did you mean add (blue) below yellow within the same wpad.da file? or..

"Part 3
Now we are going to set up a wpad read more here about wpad https://doc.pfsense.org/index.php/WPAD_Autoconfigure_for_Squid
ssh in to pfsense
8
cd /
create the wpad.da file
vi /usr/local/www/wpad.da
wq

Create two new symbolic link files
Code: [Select]
ln -s /usr/local/www/wpad.da /usr/local/www/wpad.dat
ln -s /usr/local/www/wpad.da /usr/local/www/proxy.pac

Then go Diagnostics /Edit File
click browse
user
local
www
click wpad.da
add

Code: [Select]
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";
}

save"

[aGeekhere]

You have to create 3 files in /usr/local/www/
wpad.da
wpad.dat
proxy.pac

Each having this code

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";
} 

Instead of maintaining changes for all 3 files you can create a main file e.g. wpad.da and create a symbolic link for the other 2 files, that way all changes from wpad.da are copied over to the other files.

So now you only need to make changes to wpad.da.