PfBlockerNG v2.0 w/DNSBL

BBcan177

I am receiving certificate invalid errors after enabling the DNSBL when navigating certain sites - so far the culprit seems to mainly be googleads.g.doubleclick.net when trying to serve content over an HTTPS enabled website.

@Atlan, As indicated in reggie14's post, if you can reply back with the following questions below and we can go from there.

@reggie14:

Can you provide additional information to reproduce this? What browser are you using? What webpage were you accessing? If I can see an example, and maybe inspect a packet capture and page source code may be I can see what's going on.

@shopro:

@shopro:

The dnsbl_error.log seems normal, no errors or anything else like that. The dnsbl.log says "Log file is empty or does not exist." which I assume is because the service isn't started.

Got it working by completely removing the package and settings and reinstalling, removing settings was the key though no idea what was wrong. Now it starts as it should.

If there are errors starting/stopping the DNSBL service, those will be logged to the pfSense System log. The RC file for the DNSBL service is here (/usr/local/etc/rc.d/dnsbl.sh [stop|start|restart])

@shopro:

The dnsbl_error.log seems normal, no errors or anything else like that. The dnsbl.log says "Log file is empty or does not exist." which I assume is because the service isn't started.

The dnsbl_error.log is actually an error log for DNSBL Lighttpd. I will be renaming this file to something else to avoid this confusion. This log is used to collect any HTTPS alerts from the Lighttpd conditional error process (debug.log-condition-handling option).

@AndrewZ:

Upgraded to 2.0, now always see the yellow sign on the status page with the following tooltip:

This warning indicates that the masterfile is out of sync with the files in the /deny folder. This is a new feature that was added to v2.0 to warn users about this issue. Usually running a 'Force Reload' is sufficient to fix that warning; however, clearing out all the files and starting fresh might be needed in certain conditions. If this is still an issue, please review the pfblockerng.log file for other clues.

@doktornotor:

Probably easier to just wipe the lists:
rm -rf /var/db/pfblockerng/
Reinstall the package and run 'Force Update' after that.

Can also just uncheck 'Keep Settings' and Disable 'pfBNG' and 'Save' which will do the same :)

@doktornotor:

@Asterix:

Getting this EasyList error for w/o elements.

[ DNSBL_EasyList - w/o Elements ] Download FAIL
Could not determine IP address of host.
Firewall and/or IDS are not blocking download.

Well, it's not. Also not blocked, otherwise it'd be resolved to the DNSBL VIP.

I will be adding another validation on failed downloads to check if the 'Host Address' returns as the DNSBL VIP address (Meaning DNSBL is blocking the download), and adding that to the Error Response. But yes, if the error is "Could not determine IP address of host.", then there was another issue with the DNS lookup that failed. If DNSBL was blocking this download, that error message would not be displayed.

docjay

@BBcan177

'If there are errors starting/stopping the DNSBL service, those will be logged to the pfSense System log. The RC file for the DNSBL service is here (/usr/local/etc/rc.d/dnsbl.sh [stop|start|restart])'

I didn't see anything logged in my system log to help me identify my problem. Luckily I saw your post - :)

My DNSBL service won't start. When I attempt to start it from command line it comes back with:


[2.2.5-RELEASE][root@cerberus.home]/root: /usr/local/etc/rc.d/dnsbl.sh start
2015-11-22 12:06:31: (network.c.542) SSL: BIO_read_filename('/var/unbound/dnsbl_cert.pem') failed

when I dive into 'var/unbound/' there is no 'dnsbl_cert.pem' file.

I would rather not lose all of my settings to reinstall the package. I've already tried this with the box checked 'keep settings' but it still didn't let the service start. Is there a way to get the file 'dnsbl_cert.pem' or a way to backup my settings and reapply them after I completely wipe the package?

thank you!

;D

BBcan177

@docjay:

Is there a way to get the file 'dnsbl_cert.pem' or a way to backup my settings and reapply them after I completely wipe the package?

If you run 'Force Update' that pem file should be automatically created.

docjay

Just did a 'force update' and it still didn't create the 'dnsbl_cert.pem' file. ..and I do have 'Enable DNSBL' checked.

from the log viewer:

http://pastebin.com/HbA3ZRiK

Thanks

BBcan177

It looks like Cron was running in the background when you pressed "Save"… This was in the log:

** DNSBL Disabled **

Try another 'Force update'. You also have to change the 'State' to 'Flex' for some of those lists that are failing.

Also Toasted Spam has this URL
http://toastedspam.com/deny

Also put 'StopForumSpam' into its own Alias and set the frequency to 'Once per day', as that List is rate-limiting connections.

docjay

Okay - I uncheck the 'enable DNSBL' box, saved it & then rechecked it. Saved it again, all while I made sure CRON was not running.

I also made the changes you suggested, thanks! :D

log: http://pastebin.com/jHQnF1qH

it still tells me

DNSBL Disabled

BBcan177

One of the required DNSBL settings is missing. Do you have the DNS Resolver (Unbound) enabled?

I also fixed an issue with the Download Failure function.
https://github.com/pfsense/pfsense-packages/pull/1192

docjay

I was just replying to you about my mistake! ::)

@BBcan177

Sorry to waste your time. I didn't have the DNS Resolver enabled. I disabled the DNS forwarder, enabled DNS Resolver & did another 'force update' & it built the file and updated the config.

Thanks & again, sorry!

BBcan177

NP. This will probably help someone else who hits the same scenario. Either way, seeing your 'pfblockerng.log' tweaked me to check the code and find a small error with the download failure function. ;)

docjay

You da man - DNSBL is so worth while, thanks for all of your hard work & for the re-write! ;D It makes websites load much faster & I get the screw over the man by not looking at ads.

I will be donating to you if you accept donations.

–** Good Job**--

michaelmullanyza

Hey BB.

I'd just like some clarification as I'm not sure what the differences are.

I'm currently making use of IPv4 lists in PfBlockerNG. For example, I have the "spyware" iblocklist as an alias, and deny outbound.

As you know, this converts the lists into a Firewall IP Alias and denies Outbound on LAN for this Alias.

What's the point in using the DNSBL then? I understand if I want to block the domain "facebook.com" I can do that with DNSBL, but if I'm only really making use of iblocklist.com and your bambenekconsulting lists, there's no need for me to make use of DNSBL correct?

If I haven't understood it correct, please let me know :)

mygeeknc

I'm having the same issue as the other fellow that the dnsbl web server is not starting. I don't see any errors in the System -> General logs either.

ntct

I recommend to use deinstall and install new package, not use reinstall…

Maybe this way will help.

BBcan177

@mygeeknc:

I'm having the same issue as the other fellow that the dnsbl web server is not starting. I don't see any errors in the System -> General logs either.

Checklist:

pfBlockerNG enabled in General Tab
DNSBL enabled in DNSBL Tab
VIP, port and ssl port defined in DNSBL Tab
DNS Resolver enabled

Then run a 'Force Update'. If it still doesn't start, execute the following and see if it shows any additional info:

/usr/local/etc/rc.d/dnsbl.sh start

BBcan177

@michaelmullanyza:

What's the point in using the DNSBL then? I understand if I want to block the domain "facebook.com" I can do that with DNSBL, but if I'm only really making use of iblocklist.com and your bambenekconsulting lists, there's no need for me to make use of DNSBL correct?

There are several other lists the perform better than IBlock lists. They have too many false positives. See the script that I wrote to add over 50+ different blocklists for IP Reputation.

Both IP Reputation and DNSBL achieve two different layer of protection. Not too mention that DNSBL also properly handles ADvert blocking.

Some additional reading:
https://www.sans.org/reading-room/whitepapers/dns/dns-sinkhole-33523

BBcan177

@BBcan177:

I also fixed an issue with the Download Failure function.
https://github.com/pfsense/pfsense-packages/pull/1192

Pull Request has been merged. Latest version is 2.0.1

BBcan177

@docjay:

I will be donating to you if you accept donations.
–** Good Job**--

NP :)

Panja

@BBcan177:

Both IP Reputation and DNSBL achieve two different layer of protection.

What are the differences? I'm just curious.
I love your work btw! Great job.

asterix

@tonymorella:

@doktornotor:
@Asterix:

Getting this EasyList error for w/o elements.

[ DNSBL_EasyList - w/o Elements ] Download FAIL
Could not determine IP address of host.
Firewall and/or IDS are not blocking download.

Well that's not a package error. You need working DNS. :D
$ host easylist-downloads.adblockplus.org
easylist-downloads.adblockplus.org has address 148.251.139.76
easylist-downloads.adblockplus.org has address 144.76.100.145
easylist-downloads.adblockplus.org has IPv6 address 2a01:4f8:200:114f::2
easylist-downloads.adblockplus.org has IPv6 address 2a01:4f8:192:7126::2
Filter out easylist-downloads.adblockplus.org via DNSBL as well as add it to an allow alias and see if this helps. Depending out how you having things setup could be blocking. Host lookup most likely works because it's doing is via unbound. Just a thought let us know :)

Tony M

DNS is working fine. It downloads the "Privacy" list which is just after w/o Elements.

q54e3w

Some additional reading:
https://www.sans.org/reading-room/whitepapers/dns/dns-sinkhole-33523

thanks for that - useful reading for anyone thinking about using DNSBL.