lib/htmlpurifier/library/HTMLPurifier/ConfigSchema/schema/URI.MungeSecretKey.txt

   1 URI.MungeSecretKey
   2 TYPE: string/null
   3 VERSION: 3.1.1
   4 DEFAULT: NULL
   5 --DESCRIPTION--
   6 <p>
   7     This directive enables secure checksum generation along with %URI.Munge.
   8     It should be set to a secure key that is not shared with anyone else.
   9     The checksum can be placed in the URI using %t. Use of this checksum
  10     affords an additional level of protection by allowing a redirector
  11     to check if a URI has passed through HTML Purifier with this line:
  12 </p>
  13
  14 <pre>$checksum === sha1($secret_key . ':' . $url)</pre>
  15
  16 <p>
  17     If the output is TRUE, the redirector script should accept the URI.
  18 </p>
  19
  20 <p>
  21     Please note that it would still be possible for an attacker to procure
  22     secure hashes en-mass by abusing your website's Preview feature or the
  23     like, but this service affords an additional level of protection
  24     that should be combined with website blacklisting.
  25 </p>
  26
  27 <p>
  28     Remember this has no effect if %URI.Munge is not on.
  29 </p>
  30 --# vim: et sw=4 sts=4