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- URI.MungeSecretKey
- TYPE: string/null
- VERSION: 3.1.1
- DEFAULT: NULL
- --DESCRIPTION--
- <p>
- This directive enables secure checksum generation along with %URI.Munge.
- It should be set to a secure key that is not shared with anyone else.
- The checksum can be placed in the URI using %t. Use of this checksum
- affords an additional level of protection by allowing a redirector
- to check if a URI has passed through HTML Purifier with this line:
- </p>
- <pre>$checksum === hash_hmac("sha256", $url, $secret_key)</pre>
- <p>
- If the output is TRUE, the redirector script should accept the URI.
- </p>
- <p>
- Please note that it would still be possible for an attacker to procure
- secure hashes en-mass by abusing your website's Preview feature or the
- like, but this service affords an additional level of protection
- that should be combined with website blacklisting.
- </p>
- <p>
- Remember this has no effect if %URI.Munge is not on.
- </p>
- --# vim: et sw=4 sts=4
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