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Acmlm's Board - I3 Archive - Help, Suggestions, Bug Reports - HTML filter thing New poll | |
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Boom.dk









Since: 11-18-05
From: Denmark

Last post: 6315 days
Last view: 6297 days
Skype
Posted on 08-05-06 02:15 PM Link | Quote
function fixhtml($string) {

      $domain = "acmlm\\.org";      // PCRE
      $lookfor = "edit";            // Also PCRE
      $repwith = "images/spacer.gif";

      //
      // Strip <script> tags
      //
      $string = preg_replace("@<script([^>]*?)>@si", "&lt;script\\1&gt;", $string);
      $string = preg_replace("@</script>@si", "&lt;/script&gt;", $string);

      //
      // Kill HTML tags with a missing >
      //
      $string = str_replace("&", "&amp;", $string);
      $string = str_replace("<", "&lt;", $string);
      $string = str_replace(">", "&gt;", $string);
      $string = preg_replace("@&lt;(.+?)&gt;@si", "<\\1>", $string);
      $string = str_replace("&amp;", "&", $string);

      //
      // Filter on*
      //
      while(preg_match("@<[^>]+? on.+?=[^>]*?>@si", $string, $matches)) {
            $string = str_replace($matches[0], preg_replace("@ on.+?=[^>]*?([ >])@si", "\\1", $matches[0]), $string);
      }

      //
      // Filter bogus images/links
      //
      $string = preg_replace("@<([^>]+?) (src|href)=([\"']?[^/>]+?[^:>][^/>]{2}|[\"']?://|[^>]*?".$domain."|[\"']?)[^>]*?".$lookfor."[^>]*?( [^>]*?>|>)@si", "<\\1 \\2=\"".$repwith."\"\\4", $string);

      //
      // Filter javascript in src and href
      //
      $string = preg_replace("@<([^>]+?) (src|href)=[\"']?javascript:[^>]*?( [^>]*?>|>)@si", "<\\1 \\2=\"".$repwith."\"\\3", $string);

      return $string;
}


(edited by Boom.dk on 08-05-06 01:22 PM)
(edited by Boom.dk on 08-05-06 01:22 PM)
KeiiChi Kun

Leever
Learn some manners.
Password changed to gibberish and IP banned.


 





Since: 01-01-06
From: Sushi Bar

Last post: 6310 days
Last view: 6310 days
Posted on 08-05-06 02:17 PM Link | Quote
Wow, looks pretty useful, I'll try and cram it in my board somewhere.

(edited by KeiiChi Kun on 08-05-06 01:18 PM)
Boom.dk









Since: 11-18-05
From: Denmark

Last post: 6315 days
Last view: 6297 days
Skype
Posted on 08-05-06 02:23 PM Link | Quote
*updated

Edit: Also, this was actually thought for help/suggestions, so would somebody please move it there? Thanks.

(edited by Boom.dk on 08-05-06 01:29 PM)
DarkSlaya

930
Gamma Ray








Since: 11-17-05
From: Montreal, Canada

Last post: 6297 days
Last view: 6297 days
Posted on 08-05-06 11:13 PM Link | Quote
Lolmove(tm)
Cellar Dweller +

Red Koopa









Since: 11-18-05
From: Arkansas

Last post: 6306 days
Last view: 6297 days
Posted on 08-07-06 04:57 AM Link | Quote
I've always thought(and still do) that the right way to filter HTML is to parse it and check for illegal tags, improper nesting, missing closing tags, and prohibited attributes. While harder to code, I believe that it would be much stronger against deliberate attempts to inject malicious markup than any regex based method could ever hope to be.

Too bad it is a lot more work.
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