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2105dc8e57
Closes #1567 The main reason I'm not simply merging Annika's PR is because this way makes it clearer that I'm taking responsibility for all this code, that it's mostly code I wrote, and also because it makes it easier to ensure that none of the files have been changed. (Not that I don't personally trust Annika, but I have something resembling an obligation to users not to expose them to risks based on personal trust.)
31 lines
970 B
Plaintext
31 lines
970 B
Plaintext
URI.MungeSecretKey
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TYPE: string/null
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VERSION: 3.1.1
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DEFAULT: NULL
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--DESCRIPTION--
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<p>
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This directive enables secure checksum generation along with %URI.Munge.
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It should be set to a secure key that is not shared with anyone else.
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The checksum can be placed in the URI using %t. Use of this checksum
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affords an additional level of protection by allowing a redirector
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to check if a URI has passed through HTML Purifier with this line:
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</p>
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<pre>$checksum === sha1($secret_key . ':' . $url)</pre>
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<p>
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If the output is TRUE, the redirector script should accept the URI.
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</p>
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<p>
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Please note that it would still be possible for an attacker to procure
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secure hashes en-mass by abusing your website's Preview feature or the
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like, but this service affords an additional level of protection
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that should be combined with website blacklisting.
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</p>
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<p>
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Remember this has no effect if %URI.Munge is not on.
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</p>
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--# vim: et sw=4 sts=4
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