Is this possible? A web filter triggering some other stuff

noplan · Apr 17, 2020, 2:18 PM

all possible

use pfblockerNG and a custom block page

the part where the user can klick nevermind is a total other page ...
maybe possible but not out of the box. a blocked page is blocked untill its whitelisted

nevermind squid u do not want to break https traffic ;) use pfblocker based on DNS

the rest is network stuff on your LAN side (AccesPoints ) or on the VPN side

hope it helped

BlueStarry · Apr 17, 2020, 3:48 PM

I thank you all kindy for your support, it is really appreciated i must say.
I undestand that this is very difficult.
Would be any easier to do the "routing" trough the vpn "transparently" without any acknowledgement from the user?

IE: listed website --> trough VPN, good website --> normal traffic, no portals no nothing.

What do you guys think?

thanks

noplan · Apr 17, 2020, 6:08 PM

I don't get it
Maybe lack of sleep and or sugar

A blacklist is a blacklist. (porn)
If u want a client not to get in touch with the whole blacklist you have to bypass it

I m thinking someone is trying to bypass pfB by ip (client)

If u do it by VPN don't enable pfB on that interface

Hope I got it all right

stephenw10 · Apr 17, 2020, 7:04 PM

I'm not sure how you could route traffic to the VPN gateway using pfBlocker. For small sites with a single IP or a few IPs you might be able to use it create an alias but for anything using a CDN it would be patchy at best.

Steve

BlueStarry · Apr 17, 2020, 9:08 PM

Hello kind gentlemens,
i'll try to explain better:
There are certain areas of the interwebs that are better surfed with external VPN service. i want to automate this behaviour, and the discrimination would be a list of websites based on a webfilter.

Hope this clarifies better.

My best and cheerful regards.

akuma1x · Apr 17, 2020, 10:34 PM

I'm thinking it would just be easier to use 2 computers - 1 to always connect to the internet thru a VPN to surf to "certain areas of the interwebs" and another computer to use to NOT do any of that kind of stuff. Easy... got an extra computer?

:)

Jeff

noplan · Apr 18, 2020, 3:54 PM

i still dont get it.

but to be pragmatic

enable a website filter DNS based like pfBlockerNG
use a custom information page when a site is blocked
customize this page as u like (send mail ---> put site on a whitelist after the next reload whatever)
configure a bypass for sites you want to reach only via VPN
configure thaht bypass to get routed through the VPN gateway

nice project have fun ! /me out

stephenw10 · Apr 18, 2020, 9:54 PM

@noplan said in Is this possible? A web filter triggering some other stuff:

configure a bypass for sites you want to reach only via VPN

That's the difficult bit. In Squid you can match the URL against an ACL and use a different outbound interfaces.

In pfBlocker, if you use DNS-BL, there is no alias to use in a policy routing firewall rule. If you use the fqdn directly in an alias it will catch, if you're lucky, some of the traffic for almost all sites you might want to match like Netflix for example.
You can only use an alias pulled from a list that hopes to contains all IPs for that site. You can pull that via AS number for example but that relies on the AS being up to date which they often are not.

Steve

noplan · Apr 19, 2020, 2:22 AM

@stephenw10

Isn't there post around here pretty new about bypassing pfB for a specific IP

If that works that should do the trick

The other thing what Noone told us
What's the mission of pfB in this case
blocking porn?

stephenw10 · Apr 19, 2020, 11:02 AM

Like by-passing DNS-BL? Or by-passing the firewall rules?

Either is possible. Neither will route traffic to a different gateway based on URL.

Creating aliases by AS number is the only way I've seen that get close. That can work well for blocking since if you block 90% of Facebook the remaining 10% isn't much use. But for passing and/or routing it's less effective since 10% missing does not make for a good experience!

Steve

noplan · Apr 19, 2020, 12:32 PM

not gettin deeper into by-passin DNSBL i thought this is what he @BlueStarry was askin for combined with a custom blocked website information page and tipped with a VPN routing i personally dont understand what for

you are right routing based on a url ..... ;)

and yeah content filtering is pretty anoying job if you are not above 128 GB RAM fpr the filters only ;)

stephenw10 · Apr 19, 2020, 9:22 PM

Yeah this is not a road I would ever choose to go down!