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DNSBL/Open Proxy-Blocking · **Released**: 09-14-2005

History

I've had some problems with abuse via open proxies for a time ago, and when we were banning abusers, they always found a new proxy to use and register new accounts with. Since this forum was a large type we could'nt just ban e-mails etc just like that, because this was leading to a very large amount of other banned users too.

At IRC, in the other hand, we had Open Proxy Monitors, that was banning everything that was blacklisted in some DNSBL-databases. No spammers had a chance to get in there as long they were listed in such database.

This is a plugin that blocks blacklisted hosts from some different DNSBL's. It uses the global_start-hook, a very simple handler for blocking proxies, and a vBphrase called OPM_Deny.

April 2006

The source has been rewritten a bit. The proxychecker is now using a cache that, by default, stores all ip's in a database for 6 hours. It scans some DNSBL's and can be configured to block proxies from bitmasks (defined in the plugin) which makes it a little bit more reliable, because it does'nt block everything it see).

Configuration is made from the plugin (hopefully there will be a nice admin interface in the future). Exceptions (ip's that can pass through this system even if it is a proxy) are also handled differently now.

// CHANGES
//
// 2008-09-20 (2.0.8)
//
// * Changed the routines for how to handle inclusion/exclusions
// * Splitted up plugins for 3.5/3.6 and 3.7
//
// 2007-08-05
//
// * Fixed reported bug, based on resolved hosts ending with 127
// * Changed database-tables to get rid of (hopefully) duplicate keys
// * Added resolver-function
// * Added two new block-methods available at the efnet-rbl
//
// 2006-06-28 (2.0.6/Another fix)
//
// * Proxyinclusions/exclusions didn't work properly
//
// 2006-06-28 (2.0.5/Fix only)
//
// * Fixed a bug in the $block-array that affected some of the blocking results
//
// 2006-06-28 (2.0.4)
//
// * opm.tornevall.org has a new entry for anonymizers, added support for this
// * Default value on "block everything detected" in plugin changed to "no"
//
// 2006-06-26 (2.0.3)
//
// * Created options for admincp (removed plugin-configuration)
// * Fixed a bit-bug for njabl
// * Plugin is now a function (rbl_livecheck) for external lookups
// * Added options for "only block on newuser-registrations"
//
// 2006-06-22 (2.0.3 RC)
//
// * The monitor is now a function
// * Added small compatibility with other plugins (with return)
//
// 2006-05-13
//
// * sorbs zones added (no bitmasking)
// * opm.blitzed.org removed
// * time() changed to TIMENOW
//
// 2006-04-21
// ==========
//
// * proxyinclusions
// quickly add own hosts that should be treated as a proxy
//

How does it work with other vBulletins?

This filter actually works with both 3.5 and 3.6, but for now, they will be separate versions, but for 3.5 and 3.6 you should look here and for 3.7 you should look here.

How to use the compatibility thing

If you have a plugin that you want to use together with the proxy monitor (only returns a value if a an ip-address is registered as a proxy or not) you can call the function rbl_livecheck like this (example):

PHP Code:


			
global $rblInstalled;

if ($rblInstalled) {
$remoteIsProxy = rbl_livecheck(1, $_SERVER['REMOTE_ADDR']);

//
// .. your code here ..
//

}

Report bugs if you find them...

Don't forget to install it

Loony BoB · #**122** 09-15-2006, 09:44 AM

Questions from a techy admin at my forums:

Is there an option to only scan users when logging on/are logged on, to reduce the amount of scanning even further?
Also, can it log anywhere whenever it does detect someone trying to use a proxy in case we need to troubleshoot a false positive or something?
And what sort of error message does someone detected as an open proxy receive?

Chadi · #**123** 09-17-2006, 06:04 PM

Where is "ip-field" to check if its set as key or not? If it is set as key, what should I do then?

TMM-TT · #**124** 09-19-2006, 09:50 AM

Sorry for the delayed answer.. :cry:

Quote:

Originally Posted by chadi

Where is "ip-field" to check if its set as key or not? If it is set as key, what should I do then?

The table is called proxycache and the field 'ip'.

If the key is missing, this command to the sql should fix it:

ALTER TABLE proxycache ADD PRIMARY KEY(`ip`);

Chadi · #**125** 09-19-2006, 08:06 PM

field "ip" is already there..what to do now?

TMM-TT · #**126** 09-19-2006, 08:59 PM

Quote:

Originally Posted by chadi

field "ip" is already there..what to do now?

Can you see if it has a primary key?
If you think it hasn't, try the command I gave before -
ALTER TABLE proxycache ADD PRIMARY KEY(`ip`);

Hopefully, that'll help..If not, you can try to reinstall the product or use...
OPTIMIZE TABLE proxycache
alt.
REPAIR TABLE proxycache

...instead

venomx · #**127** 09-19-2006, 10:17 PM

I would like one like this that used the list from http://www.ahbl.org/docs/ircbl.php

Also would be nice to have one that checked the URLS people put it their posts and blcok them if they are listed on lists we select.

TMM-TT · #**128** 09-20-2006, 08:29 AM

Quote:

Originally Posted by venomx

I would like one like this that used the list from http://www.ahbl.org/docs/ircbl.php

If you want the standard support, just add ircbl.ahbl.org to the DNSBL list in the configuration (attached example). I'll try add specific support for it in the next version.

Quote:

Originally Posted by venomx

Also would be nice to have one that checked the URLS people put it their posts and blcok them if they are listed on lists we select.

Do you mean like if someone posts www.freeporn.com into the forum, that post should be blocked if it's listed in the BL?

Loony BoB · #**129** 09-22-2006, 06:02 AM

Quote:

Originally Posted by Loony BoB

Questions from a techy admin at my forums:

Is there an option to only scan users when logging on/are logged on, to reduce the amount of scanning even further?
Also, can it log anywhere whenever it does detect someone trying to use a proxy in case we need to troubleshoot a false positive or something?
And what sort of error message does someone detected as an open proxy receive?

Any chance of an answer to these questions? I need to know before we can go ahead with implementing this on our forums. Thanks in advance.

TMM-TT · #**130** 09-22-2006, 06:50 AM

Quote:

Originally Posted by Loony BoB

Any chance of an answer to these questions? I need to know before we can go ahead with implementing this on our forums. Thanks in advance.

There is no option for that yet, but can be fixed.

Do you want it to work with the login.php-script only, and if a userid is equal to a logged in user?

Loony BoB · #**131** 09-26-2006, 12:57 PM

That sounds good - If my techy has other thoughts I'll be sure to post them.

Also, is there any chance of knowledge on the second two questions?

Thanks once again for all your help.

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