Bypassing DNSBL for specific IPs

turbotater19

I pasted my code in and initially it didn't work. Took out the leading spaces on each line and that fixed it, working as I'd hoped!

Overlord

@gertjan
I can't find it? Is it removed?

I'm trying to find a solution to unblock an IP, which is one of my blocklist as false positive.

Gertjan

@overlord said in Bypassing DNSBL for specific IPs:

I can't find it?

Find what ?
The initial - see above - is "how to bypass a specific IP".
Reading the post shows that @Ns8h wanted to exclude a LAN device from being DNSBL'ed by pfBlocker - this was in 2018.

Or do you man : You want to whitelist an IP ( or DNSBL ?) from a list/feed you use ?
In that case, go to Firewall > pfBlockerNG > Alerts and look up the line where the IP was blocked. Example :

if I want to unblock "8.8.8.8" blocked by the firewall rule pfB_DoH_IP_v4 (uses an alais that contains all the IPs from the TheGreatWall_DoH... DNDBL feed, I have to move the mouse to the red padlock, click and follow the instructions.
This measure is temporary - as stated.

Clicking on the black + sign is permanent :

Just follow the instructions.

shon

@gertjan said in Bypassing DNSBL for specific IPs:

Yep, this box should be checked :

This did not work for me at all, and neither using custom unbound views. Not sure where else to look.

Gertjan

@shon

Just checking "Python Group Policy" does nothing.
It's stated that "Enable the Python Group Policy functionality to allow certain Local LAN IPs to bypass DNSBL"

So certain local IPs have to be entered.

Like :

edit :

I didn't have any DNSBIl activated, so I activated one.
This one :

Take a look at the feed text, and you find the last entry :
avsvmcloud.com

On my PC with the IP 192.168.1.2 (on the policy list - see my image above) I could obtain an IP :

Or, on another PC using IP 192.168.1.9, I obtained "0.0.0.0" == DNSBL blocked ( I'm not using the build in pfBlockerNG web server, if I was, I would have received 10.10.10.1 ).

My conclusion : Group policy works.

I did not test IPv6 here. For IPv4 it worked.

shon

@gertjan I added my local IP4 addresses under the group policy as host IP's with no subnet mask range e.g. /32 /24 etc.. I restarted pfsense, unbound, ran , update force, reload and still no dice. I love the way it works but I need to whitelist IP's to get around pfblocker/dnsbl/geoip restrictions I've set already. thanks!

Overlord

@gertjan
As I can see there are no rules under "Deny". I have read there, that this issue could be from the installed version (2.1.4_26). Is this 2x version still in development? Is there a release date for the 3.x devel version? (Devel becomes non devel)

michmoor

@smokinmojoe I was literally saying this out loud to myself. This package has been available for quite some time and the fact that this request which is very reasonable and very obvious that is needed is not implemented really hurts my soul.

Yes, DNS sinkholing is great. You would think along the way someone would've thought to themselves "Gee, what if there's a user that shouldn't be restricted". Pretty much the follow-up to that thought was "ehh that would never happen. what an unlikely thing to think".

Gertjan

@michmoor

Not implemented ?

I just spend looking some time why my DNSBL didn't seem to work. Then I found out out wasn't working for the PC is was using, but it was working, for the PC right next to me.
I recalled : I've added the IPv4 and IPv6 of the PC I'm using on the "Python Group Policy" list.

Btw : Python Group Policy was added to the "pfBlockerNG-devel 3.1.0_1"", not the ancient 'pfBlockerNG 2.1.4_26'.

pftdm007

Unless there's something wrong in my config, I think I found a bug with bypassing DNSBL with the python feature...

For example, that if I add a client to the exclusion list (Python group policy) to bypass DNSBL, almost immediately after, DNSBL starts behaving very weirdly by allowing traffic from the unblocked client as it should, but randomly also from other clients. Sometimes it returns the 1x1 gif thingy, sometimes the webpage with "This website BLABLABLA has been blocked by the Network Administrator!"

(Edited this post after more troubleshooting)

Gertjan

@pftdm007

Your are using the correct IP addresses ? Like :

When you change DNSBL settings :
Do a force realod all for pfBlocker.
Reset for every LAN device the local DNS cache.
Windows will need a

ipconfig /flushdns

@pftdm007 said in Bypassing DNSBL for specific IPs:

Sometimes it returns the 1x1 gif thingy, sometimes the webpage with "This website BLABLABLA has been blocked by the Network Administrator!"

That what's left over from the DNSBL web server that wants to tell you a page has been blocked.
To make a long story short : don't use the DNSBL web server, because (repeat after me) "it is impossible to redirect a https request".

Select :

michmoor

@pftdm007 python mode is very iffy. I have found that using unbound custom dns options works way better to exclude hosts or networks from DNSBL where as python mode only allows /32 exclusions which isn’t very scalable at all. I would highly recommend that over python mode.

pftdm007

@gertjan said in Bypassing DNSBL for specific IPs:

Your are using the correct IP addresses ?

Yes. Client assigned IP's from pfsense's DHCP server.

@gertjan said in Bypassing DNSBL for specific IPs:

When you change DNSBL settings :
Do a force realod all for pfBlocker.
Reset for every LAN device the local DNS cache.

I do a force reload on ALL (pfb and DNSBL). I usually close all browsers on all machines and retry, I haven't reset the local DNS cache per-se but will try. I only use linux boxes.

@gertjan said in Bypassing DNSBL for specific IPs:

don't use the DNSBL web server, because (repeat after me) "it is impossible to redirect a https request".

Okay I had No Global mode set and changed it to Null Block (logging). lets see if DNSBL is more stable and predictable.

shon

@gertjan

Just following up on this -- (Thanks for your help!)

The Python Group Policy action works for whitelisting any clients, per host address e.g. 192.168.1.100 that we do not want DNSBL to filter.

However I have another problem, sort of in the same neighborhood.

I am using GeoIP as well using a domain name white list alias (domain a/s lookup enabled) that I created called "domain_whitelist_v4"

This is the alias URL in the fw:

https://127.0.0.1:443/pfblockerng/pfblockerng.php?pfb=pfB_domain_whitelist_v4

I'm trying to use the same GeoIP alias file " domain_whitelist_v4" in a DNSBL Group Feed source definition to not take action/block on.

The URL I set of the DNSBL group feed source definition is https://127.0.0.1:443/pfblockerng/pfblockerng.php?pfb=pfB_domain_whitelist_v4.txt

I have the action set to "Disabled" instead of Unbound.

I figure that If I update the GeoIP alias "domain_whitelist_v4" section, that I do not have to then also update the DNSBL Whitelist section too since their (DNSBL & GeoIP) are both referencing the same domain name list (domain_whitelist_v4). Instead I have to update in 2 places for domain reachability sometimes depending if its also being blocked via GeoIP

Ideally, I don't want to remove all filtering for some clients, but instead I'd like to update one alias file that covers both DNSBL (permit) and GeoIP (permit)