Creating My Own IP4 Deny List Within PFB

johnpoz

@lpd7yeah if your using some non root account. Like I created a testuser and put them in the admin group, and this does not work. Permission denied, but that is because the permissions are locked to only root being able to access that.

[22.05-RELEASE][testuser@sg4860.local.lan]/var/db/pfblockerng: ls -la
total 124
drwxr-xr-x  11 root  wheel      15 Aug 25 20:14 .
drwxr-xr-x  21 root  wheel      45 Aug 25 18:53 ..
drwxr-xr-x   2 root  wheel       2 Jul 25 08:03 ET
drwxr-xr-x   2 root  wheel       3 Aug 25 15:16 deny
drwxr-xr-x   2 root  wheel       2 Feb 14  2022 dnsbl
drwxr-xr-x   2 root  wheel       2 Feb 14  2022 dnsblalias
drwxr-xr-x   2 root  wheel       2 Feb 14  2022 dnsblorig
-rw-r--r--   1 root  wheel   10001 Aug  4 22:00 geoip.txt
-rw-r--r--   1 root  wheel  143360 Aug 25 20:14 ip_cache.sqlite
-rw-r--r--   1 root  wheel       0 Jul 25 08:03 mastercat
-rw-r--r--   1 root  wheel       0 Jul 25 08:03 masterfile
drwxr-xr-x   2 root  wheel       2 Feb 14  2022 match
drwxr-xr-x   2 root  wheel      10 Aug 25 15:00 native
drwxr-xr-x   2 root  wheel      10 Aug 25 15:00 original
drwxr-xr-x   2 root  wheel       2 Feb 14  2022 permit
[22.05-RELEASE][testuser@sg4860.local.lan]/var/db/pfblockerng:

If you had installed the sudo package you should be able to allow your other user to su up to root.. And then you could do it.

[22.05-RELEASE][testuser@sg4860.local.lan]/var/db/pfblockerng: sudo su

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

Password:
# ls -la
total 247
drwxr-xr-x  11 root  wheel      15 Aug 25 20:14 .
drwxr-xr-x  21 root  wheel      45 Aug 25 18:53 ..
drwxr-xr-x   2 root  wheel       2 Jul 25 08:03 ET
drwxr-xr-x   2 root  wheel       3 Aug 25 15:16 deny
drwxr-xr-x   2 root  wheel       2 Feb 14  2022 dnsbl
drwxr-xr-x   2 root  wheel       2 Feb 14  2022 dnsblalias
drwxr-xr-x   2 root  wheel       2 Feb 14  2022 dnsblorig
-rw-r--r--   1 root  wheel   10001 Aug  4 22:00 geoip.txt
-rw-r--r--   1 root  wheel  143360 Aug 25 20:14 ip_cache.sqlite
-rw-r--r--   1 root  wheel       0 Jul 25 08:03 mastercat
-rw-r--r--   1 root  wheel       0 Jul 25 08:03 masterfile
drwxr-xr-x   2 root  wheel       2 Feb 14  2022 match
drwxr-xr-x   2 root  wheel      10 Aug 25 15:00 native
drwxr-xr-x   2 root  wheel      10 Aug 25 15:00 original
drwxr-xr-x   2 root  wheel       2 Feb 14  2022 permit
# cd deny
# whoami
root
# touch newfile.txt
# ls -la
total 20
drwxr-xr-x   2 root  wheel   4 Aug 25 21:12 .
drwxr-xr-x  11 root  wheel  15 Aug 25 20:14 ..
-rw-r--r--   1 root  wheel   0 Aug 25 15:16 myipblocklist.txt
-rw-r--r--   1 root  wheel   0 Aug 25 21:12 newfile.txt
#

.I will need to deny individual ip's as well as whole networks, does that throw a wrench into my plans?

It would for the way to block domains with unbound options, either directly or loaded by file in the custom options box in unbound. This would only work for actual domains to be prevented from being looked up.

LPD7

@johnpoz
You just id'd my next issue...Sudo is not available and I cant do apt-get or any update. I was trying to use nano to edit the txt file which is how I stumble upon this. Not sure why. I know I did this on my Ubuntu VM instances from the terminal but dont recall installing any packages on the FW outside of what PFS installed when I built it.

How do i crack this nut?

Thinking cap is on tonight.

SteveITS

@lpd7 you’re making it hard. :)

Diagnostics/Edit file.

System/Packages , install sudo package.

pfSense is not Linux, and it isn’t designed to have lots of things installed on it.

johnpoz

@lpd7 @SteveITS is right I think your making this harder than it needs to be, and just install the sudo package via the gui

Also to the linux comment by Steve - while sure there is cmd line, and stuff you can do from that - generally speaking pfsense is meant to be fully managed by the gui. You should really never have to do anything directly from the cmd line.

While you might be used to editing files directly on linux, conf files, and etc - with pfsense your meant to do it via the gui.

Also nano can just be installed with pkg install nano

I have it installed on mine, it is in the pfsense repo

[22.05-RELEASE][admin@sg4860.local.lan]/root: pkg info nano
nano-6.0
Name           : nano
Version        : 6.0
Installed on   : Sat Jul  2 09:25:52 2022 CDT
Origin         : editors/nano
Architecture   : FreeBSD:12:amd64
Prefix         : /usr/local
Categories     : editors
Licenses       : GPLv3
Maintainer     : danilo@FreeBSD.org
WWW            : http://www.nano-editor.org/
Comment        : Nano's ANOther editor, an enhanced free Pico clone
Options        :
        DOCS           : off
        EXAMPLES       : off
        NLS            : on
Shared Libs required:
        libintl.so.8
Annotations    :
        FreeBSD_version: 1203506
        build_timestamp: 2022-06-01T19:10:49+0000
        built_by       : poudriere-git-3.3.99.20211130
        port_checkout_unclean: no
        port_git_hash  : 44b5542e32b4
        ports_top_checkout_unclean: yes
        ports_top_git_hash: eac3af4a7698
        repo_type      : binary
        repository     : pfSense
Flat size      : 2.38MiB
Description    :
nano is a small, free and friendly editor which aims to replace
Pico, the default editor included in the non-free Pine package.
Rather than just copying Pico's look and feel, nano also implements
some missing (or disabled by default) features in Pico, such as
"search and replace" and "goto line number".

WWW: http://www.nano-editor.org/
[22.05-RELEASE][admin@sg4860.local.lan]/root:

If what your looking to do is block IPs and CIDRs - that is just much easier to do with the built in aliases to be honest via gui, you can load in a bunch if you have them already in some other file.

You can then just edit that added to it remove from it via the gui.

stephenw10

Yes, 'big' here would be a list of >10,000 subnets for example.

If you are dealing with, say, <1000 subnets then just use an alias in pfSense directly.

Side note; whilst not as powerful as Nano the Easy Editor ee is included in pfSense by default and is more than enough to edit a few txt files. Also it has almost zero learning curve!

Steve

LPD7

@stephenw10 @johnpoz @SteveITS
All good info, I know that I may be going about this the hard way but thats how I learn that is until my brain overloads and I need to take a twizzler and pepsi break or maybe something stronger like a skittles and red bull. Let me digest this and take some notes and summarize and see if I cant settle on a solution you think would work best. Thank you.

LPD7

@lpd7 said in Creating My Own IP4 Deny List Within PFB:

@stephenw10 @johnpoz @SteveITS

Hello all my apologies for the delay but I can only devote time in chunks, my family wont give me space to play unless its something they want to play. I have to remind myself where I left off but I did enter a bunch of TikTok ip addresses via the bulk import option but yet I can still access the web site, I am going to do a bit more digging to see if I cant locate more addresses to see if there are others that were missed. Since the kids are back to school my oldest is once again "playing silly buggers" so I have to find a way to clamp down or at the very least log with specific detail (url, duration, frequency, etc) what they are up to so we can decide on how best to address or ban the devices all together (now wouldnt that make me popular). I will regroup and see where I had left off (need to take notes) and go from there. Thanks for all of your help.

stephenw10

Something like Tiktok exists over many, many IP addresses. If I was attempting that I would first try using their AS number in an alias via pfBlocker. That usually blocks enough things to make it unusable even if not blocked entirely. Works quite well for Facebook and Netflix. I've never tried it for Tikok.

Steve

LPD7

@stephenw10
Hey Stephen thanks for the recommend, I may give this a whirl. Now the question, how do I find the AS numbers? I did a search for TikTok AS routing and nothing came up, gonna have to do a bit more research. Would they be listed in an internet registry somewhere? Thanks.

johnpoz

@lpd7

its right there built into pfblocker

But there prob way more than that - because I believe lots of it is hosted on other CDNs

stephenw10

Yup. Many, many IPs!
But that's usually enough to break it sufficiently.

LPD7

@johnpoz
Thanks for that John. Just by way of education, how would I find all the numbers associated with a domain? I found https://ipinfo.io which had the AS# you mentioned and seems if I input an IP it will provide the AS# is there a way (hoping) where I can input the domain name and get a complete list?

LPD7

@stephenw10
So if I filter one or two AS's it should be enough to break it to the point where it becomes unusable?

stephenw10

Yup, that has been my experience with other sites like Netflix and Facebook.

johnpoz

@lpd7 said in Creating My Own IP4 Deny List Within PFB:

find all the numbers associated with a domain?

Can entail some detective work to be sure. For example you have www.domain.com, while easy enough to look up that IP.. And from that IP get the ASN that IP is part of, so any other IPs in that ASN.

But what if this company using domain.com also hosts their backend stuff for their services of CDNnetwork, or OtherCompany, etc. etc..

So while you might be able to block some of their front end stuff they host on ASN1, but they could providing their whole software or system using ASN2, and ASNX, etc.

The more global and complex a system might be, the harder it can be to block or find all the possible IPblocks being used to host that system on a global scale. Don't forget IPv6 as well - that would be completely different ASNs

And don't forget if you start blocking CDNnetworkX ASN, you could end up blocking other stuff hosted there that you didn't want to block.

If it was me, I would just block on dns - don't allow clients to use external dns. Blocking doh can come with its own headaches, but easier than trying to block a huge list of IPs service might use, and some of these ip ranges these days quite often shared with other services you might not want to block.. Most everything these days is hosted of very large CDNs (content delivery network)..

Blocking those can be very problematic when comes to stuff you want to work, now not working.

Prob easier to just find the fqdn client is trying to access to get it to said service, and block those via dns.