vb.org Archive - Attachment and avatar hotlinking protection (1.0.1)

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- vBulletin 2.x Full Releases (https://vborg.vbsupport.ru/forumdisplay.php?f=4)

- - Attachment and avatar hotlinking protection (1.0.1) (https://vborg.vbsupport.ru/showthread.php?t=47306)

fury	01-02-2003 10:00 PM

Attachment and avatar hotlinking protection (1.0.1)

Support in this thread or by email (preferrably thread)

vBulletin 2.2.x (tested on 2.2.9)

Prevents people from linking to attachments and custom avatars on your forum from other sites.

Example:
Attachment hotlinking protection: Click and watch the redirection message. You are then taken straight to the post containing the attachment.

Custom avatar hotlinking protection: Click and watch the redirection message again. This time you are taken to the user's profile.

When the attachment is linked to via an img tag, it is shown as a red x in IE, or a torn paper in Mozilla.

Modifications:
2 file modifications
/forum/attachment.php
/forum/avatar.php
1 new template
redirect_wrongreferrer

Updates since 1.0:
Added custom avatar hotlinking protection

Modifications since last version:
2 file modifications
/forum/attachment.php
/forum/avatar.php
1 template modification
redirect_wrongreferrer

For upgrade instructions see the text file.

Note for people who have problems getting the avatar hotlinking protection to work: Try this code in the avatar.php modification instead of mine

Mystis

01-03-2003 03:45 AM

Great idea! I might have to install this one.

nuno	01-03-2003 03:50 AM

Yeah, Baby, Yeah!
Great addition
Thx fury :)

[edit]clicks install[/edit]

fury	01-03-2003 03:52 AM

No problem! http://smilies.xibase.com/buttrock.gif Thanks for the installage! :D

Dr Shark

01-03-2003 06:37 AM

This will probably cut down on some bandwidth my forum is useing, nice hack.
*click's install*

Kars10

01-03-2003 07:10 AM

Cool idea!!

[high]* Minifreunde clicks install! ;)[/high]

nuno	01-03-2003 07:21 AM

I swear i saw a post asking the same thing for avatars :wherethehellisit:

Chris M

01-03-2003 08:01 AM

Nice Idea, but I've already got one that protects attachments and avatars:)

Satan

partang2

01-03-2003 10:00 AM

Nice!

*Clicks install*

fury	01-03-2003 12:24 PM

Quote:

Originally posted by nuno
I swear i saw a post asking the same thing for avatars :wherethehellisit:

Me too. :confused:

Schorsch

01-03-2003 02:59 PM

just installed, works fine.

Thanks https://vborg.vbsupport.ru/external/2011/01/19.gif

w596	01-03-2003 03:00 PM

Yes you did see that... I posted the question early this morning but found what I was looking for in another thread, then deleted my post. Sorry about that. lol ;)

N9ne	01-03-2003 03:10 PM

I believe the same code can be used for avatar.php to protect avatars :)

fury	01-03-2003 03:40 PM

Yes, I think I will add that to the hack.

fury	01-03-2003 04:28 PM

Hack has been updated to include custom avatar hotlinking protection. See the first post for info, or grab the text file for upgrade instructions :)

nuno	01-03-2003 04:46 PM

No joy fury
Apache test log file

Code:

[Fri Jan 03 10:43:59 2003] [error] PHP Notice:  Undefined index:  HTTP_REFERER in c:\apache\htdocs\avatar.php on line 6

[Fri Jan 03 10:43:59 2003] [error] PHP Notice:  Use of undefined constant host - assumed 'host' in c:\apache\htdocs\avatar.php on line 8

[Fri Jan 03 10:43:59 2003] [error] PHP Notice:  Undefined index:  host in c:\apache\htdocs\avatar.php on line 8

fury	01-03-2003 04:55 PM

Weird...

Does the attachment hotlinking protection work on the same server?

You got an MSN messenger addy I can contact you at? If not, just send me your avatar.php to dennis@xibase.com and I'll take a look at it

nuno	01-03-2003 04:58 PM

fury, the avatar hotlinking is not working at otcentral as well, after the redirect message you get kicked to profile page and the avatar is broken.
Check your log files. ;)

nuno	01-03-2003 05:03 PM

Attachment hotlinking is working flawlessly, so it went to live forums.
Avatar hotlinking is being tested at localhost.

fury	01-03-2003 05:05 PM

Avatar hotlinking seems to be working fine for me on both localhost and live server... :confused:

Try this: Move this line

Code:

set_magic_quotes_runtime(0);

to just above

Code:

$c_url = parse_url($GLOBALS[HTTP_REFERER]);

Smoothie

01-03-2003 05:19 PM

excuse my ignorance, but how does one link an attachment or avatar via the [ img ] tag?

DrkFusion

01-03-2003 05:21 PM

Let me try and show you

fury	01-03-2003 05:21 PM

Right click on an attachment or avatar at your site. Go to Properties

You will see a URL in the Address (IE) or Location (Mozilla) box. Select it and hit Ctrl+C.

Then place the URL inside [ IMG][/IMG] tags.

DrkFusion

01-03-2003 05:23 PM

http://forum.noxmedia.net/link.html
Right click on the properties and check the url :)

Smoothie

01-03-2003 05:30 PM

If I use that url in the [img tag] it does not display the avatar. here's the url i get:
https://vborg.vbsupport.ru/attachmen...&postid=338025

fury	01-03-2003 05:43 PM

Hmm, weird, guess vBulletin.org doesn't like them

NTLDR

01-03-2003 05:48 PM

I expect vB.org has it set to know to allow dynamic images, ie images with ? in the URL.

nuno	01-03-2003 05:55 PM

Quote:

Originally posted by fury
Avatar hotlinking seems to be working fine for me on both localhost and live server... :confused:

Try this: Move this line

Code:

set_magic_quotes_runtime(0);

to just above

Code:

$c_url = parse_url($GLOBALS[HTTP_REFERER]);

nope :(
I'm running php4.3.0 locally and php4.2.3 at live forums.

nuno	01-03-2003 06:10 PM

hmm
seems to be working now
fix is attached

fury	01-03-2003 06:14 PM

Odd, the one you posted doesn't work on my localhost.

Well, I'll put a link directly to your post in the original post for people who have the same problem as you did. Hopefully either solution will work :)

nuno	01-03-2003 06:29 PM

odd indeed :confused:
Do you get the same error?

fury	01-03-2003 06:31 PM

Nope. It just shows a red x in images and automatically redirects me (even with links from inside the site)

nuno	01-03-2003 06:38 PM

ooh found the mofo
http://www.php.net/manual/en/functio...-reporting.php

nuno	01-03-2003 06:41 PM

Set error_reporting to E_ALL in your php.ini and you will get a PHP error notice message.

fury	01-03-2003 07:30 PM

User error. http://smilies.xibase.com/laugh5.gif

I left **DOMAINNAME** in there when redoing the modifications to avatar.php

C.Birch

01-05-2003 08:40 AM

erm let me see this stop's hotlinking by when someone views the file from out side of the domain there taken back to the profile page or post im i right?

Now lets look at this you got a forum for a group along with other sites about the same group some user's use more then one board.

Now lets say someone upload's a av to my board with this hotlinking code installed then they go to a other sites board and hotlink to the av on my board now whats going happen when that person views there profile of any posts they have made on that other board?

Yes they be taken back to my forums and so will any other person that views a post on that board that person has posted in.

great way to get hits but will not make you many friends.

fury	01-05-2003 08:02 PM

Do you mean when someone enters the URL to the avatar in the custom URL box at another site? It won't even work because the contents of the avatar file will be text (the redirection message). The board (if it's vBulletin, anyway) would give an error message saying it's not a correct file type or something.

If they use an IMG tag to link to it, it will show up as a red X, and when someone drags the link to it into the address bar or puts a URL tag around it, it will link to the redirection notice and the profile page.

I don't see why protecting one's bandwidth from getting stolen without the person viewing the site it's getting stolen from is such a bad thing, unless you have hundreds of gigs to give away, but if it's not for you, then just don't install it. (holy run-on sentence batman!)

You don't have to attack the people that prefer to use it.

fury	01-07-2003 03:23 AM

Damn :(

I had to uninstall this at my own site. It was causing avatars and attachments not to show up for people behind firewalls or using browsers that didn't send referrer info through links. Just letting you know in case any of your members speak up and say they're not seeing avatars or attachments.

KuraFire

01-07-2003 10:56 PM

I wrote a little bit of code that I stuffed at the very very top of avatar.php, attachment.php and journalpic.php (a self-written image send file much like the other two, used for my own Journal System)...

If you paste an avatar/attachment url in your browser directly, it works (which is much nicer for your bandwidth than _redirecting them to threads on your site_ :p), if you use them on other sites however (as part of the HTML page), they won't work and the image you will see there is a fake no-deeplinking-image that you make yourself (mine says "No banana my friend!" :)).

It checks the URL to match your own domain but in a more efficient way (the one from this hack can easily be spoofed, thus, it won't work then)

Notes:
a) the {0,15} at the (relative) start will match for subdomain(s) or lack thereof. If you have a subdomain longer than 15 characters, make the 15 number higher :)
(it also works for http://yourdomain.com, thus, without www. )
b) the path directive is a full path towards the image you'll be serving out, check your own host's settings to see what exactly you need to enter there :)

PHP Code:


		
			
if(isset($_SERVER['HTTP_REFERER'])){

    if(!preg_match("'^(http://).{0,15}(YOURDOMAINHERE.com)'i", $_SERVER['HTTP_REFERER'])){

        $path = "/home/users/yourusername.com/html/YOURDOMAINHERE.com/YOURANTIDEEPLINKINGIMAGE.png";

        $filesize = filesize($path);

        $fp = fopen($path, "r");

        $attachmentinfo['filedata'] = fread($fp, $filesize);

        fclose($fp);

        header("Cache-control: max-age=31536000");

        header("Expires: " . gmdate("D, d M Y H:i:s",time()+31536000) . "GMT");

        header("Content-Length: $filesize");

        header('Content-type: image/png'); // adjust this if you use a .gif or a .jpg (image/gif || image/jpeg)

        echo $attachmentinfo['filedata'];

        exit;

    }

}

If you do it right, you can fully prevent deeplinking with this if you put it at the start of avatar.php & attachment.php (and any other image serving file you may be using) :up:

Any questions? PM me (I doubt I'll ever see this thread again if I don't get pm'd a question... :))

Sia Bani

03-01-2003 12:26 AM

Wow, I'm really impressed with myself right now! I'm such a newbie, its ridiculous!

Here's an error in your attachment code:

"/showthread.php?s=".$session[sessionhash]."&threadid=".$redirectquery[threadid]."#post".$redirectquer

y[postid];
$redirecttype = "post";

The space from $redirectquer to y[postid] had it not working. I fixed that and all is good now!

Well done man!

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