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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

TMM-TT · #**152** 08-05-2007, 07:31 PM

Just updated my own forum with this one, that hopefully gets rid of a resolver-problem. Please report bugs, if you find them.

// 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

Administered from admin -> options -> DNSBL/Open Proxy monitoring

If you still have problems with duplicate keys, try reinstall the new version from scratch. I've removed the keying, to see if it works better without it. I think I should take care of some other problems reported here too, like the exclusion-part, so admins also can exclude domains (not just IP's) from the checking.. At least try, since I guess extra resolving takes extra time..

dfiedler · #**153** 11-02-2007, 05:46 AM

...then grandly attempted to demonstrate it to my wife by looking up "free web proxy" on Google and connecting with the first thing I saw, which turned out to be a network of web-based proxies at http://www.privax.us

Not only wasn't it blocked by this plugin, but I copy/pasted the entire list of their proxy sites into the proper place in the Admin Control Panel, and it still wasn't blocked!

I am no longer sure this thing is even working...how can I check?

Thanks in advance.

TMM-TT · #**154** 11-02-2007, 06:03 AM

I don't know how other proxy-blockers works, but webproxies are added manually into the dnsbl at tornevall.org (at least for the moment).

You can test ip's by adding them into this url: http://dnsbl.tornevall.org/scan.php?ip=XXXX (where XXXX is the IP)

Like this: http://dnsbl.tornevall.org/scan.php?ip=149.9.0.58

Edit: It seems that all those sites listed at privax is using the same exit...

TMM-TT · #**155** 11-02-2007, 09:12 AM

Quote:

Originally Posted by dfiedler

Not only wasn't it blocked by this plugin, but I copy/pasted the entire list of their proxy sites into the proper place in the Admin Control Panel, and it still wasn't blocked!

I saw that I missed explaining this part so I'll do that too

If you want to block hosts based on webproxys you must add the exit-ip into the controlpanel. Some proxies have different "exits" compared to the website you're testing from.

Anyway, I've added some anonymous webproxies into the dnsbl now, so if you want to test some of them, I think you can do that now.

dfiedler · #**156** 11-02-2007, 09:29 AM

Quote:

Originally Posted by TMM-TT

I saw that I missed explaining this part so I'll do that too

If you want to block hosts based on webproxys you must add the exit-ip into the controlpanel. Some proxies have different "exits" compared to the website you're testing from.

Anyway, I've added some anonymous webproxies into the dnsbl now, so if you want to test some of them, I think you can do that now.

I'm not sure what you mean by "exits", but I did see that the first proxy listed used an address like w2.hidemyass.com when browsing so that's what I put in the control panel.

Anyway thanks for the fast response!

Emarkay · #**157** 12-19-2007, 05:22 PM

Outstanding! Works great.

Any way we can edit the error message? I tried looking around but couldn't come up with how to do it.

TMM-TT · #**158** 12-19-2007, 06:24 PM

Quote:

Originally Posted by Emarkay

Outstanding! Works great.

Any way we can edit the error message? I tried looking around but couldn't come up with how to do it.

Fun to hear that!

The error message is a global phrase called OPM_Deny.

bulbasnore · #**159** 08-07-2008, 07:41 AM

installed

worked on http://hidemyass.com

TMM-TT · #**160** 08-07-2008, 05:53 PM

Quote:

Originally Posted by bulbasnore

installed

worked on http://hidemyass.com

The ip I got from that site when I tried to use it, was added to Tornevall DNSBL at 2007-11-02. Maybe you have the wrong settings for the plugin?

You should enable the option "opm.tornevall.org: Block anonymizers".

Killy01 · #**161** 08-08-2008, 08:15 AM

Thanks for this, good modification should help stop people spamming on proxies.

Cheers

Killy

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