1126 lines
32 KiB
PHP
1126 lines
32 KiB
PHP
<?php
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/**
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* HTML/XHTML filter that only allows some elements and attributes
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*
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* Added wp_ prefix to avoid conflicts with existing kses users
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*
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* @version 0.2.2
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* @copyright (C) 2002, 2003, 2005
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* @author Ulf Harnhammar <metaur@users.sourceforge.net>
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*
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* @package External
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* @subpackage KSES
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*
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* @internal
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* *** CONTACT INFORMATION ***
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* E-mail: metaur at users dot sourceforge dot net
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* Web page: http://sourceforge.net/projects/kses
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* Paper mail: Ulf Harnhammar
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* Ymergatan 17 C
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* 753 25 Uppsala
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* SWEDEN
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*
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* [kses strips evil scripts!]
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*/
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/**
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* You can override this in your my-hacks.php file You can also override this
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* in a plugin file. The my-hacks.php is deprecated in its usage.
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*
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* @since 1.2.0
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*/
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if (!defined('CUSTOM_TAGS'))
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define('CUSTOM_TAGS', false);
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if (!CUSTOM_TAGS) {
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/**
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* Kses global for default allowable HTML tags.
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*
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* Can be override by using CUSTOM_TAGS constant.
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*
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* @global array $allowedposttags
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* @since 2.0.0
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*/
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$allowedposttags = array(
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'address' => array(),
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'a' => array(
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'class' => array (),
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'href' => array (),
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'id' => array (),
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'title' => array (),
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'rel' => array (),
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'rev' => array (),
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'name' => array (),
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'target' => array()),
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'abbr' => array(
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'class' => array (),
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'title' => array ()),
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'acronym' => array(
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'title' => array ()),
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'b' => array(),
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'big' => array(),
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'blockquote' => array(
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'id' => array (),
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'cite' => array (),
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'class' => array(),
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'lang' => array(),
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'xml:lang' => array()),
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'br' => array (
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'class' => array ()),
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'button' => array(
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'disabled' => array (),
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'name' => array (),
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'type' => array (),
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'value' => array ()),
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'caption' => array(
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'align' => array (),
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'class' => array ()),
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'cite' => array (
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'class' => array(),
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'dir' => array(),
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'lang' => array(),
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'title' => array ()),
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'code' => array (
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'style' => array()),
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'col' => array(
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'align' => array (),
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'char' => array (),
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'charoff' => array (),
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'span' => array (),
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'dir' => array(),
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'style' => array (),
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'valign' => array (),
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'width' => array ()),
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'del' => array(
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'datetime' => array ()),
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'dd' => array(),
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'div' => array(
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'align' => array (),
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'class' => array (),
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'dir' => array (),
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'lang' => array(),
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'style' => array (),
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'xml:lang' => array()),
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'dl' => array(),
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'dt' => array(),
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'em' => array(),
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'fieldset' => array(),
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'font' => array(
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'color' => array (),
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'face' => array (),
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'size' => array ()),
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'form' => array(
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'action' => array (),
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'accept' => array (),
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'accept-charset' => array (),
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'enctype' => array (),
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'method' => array (),
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'name' => array (),
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'target' => array ()),
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'h1' => array(
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'align' => array (),
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'class' => array ()),
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'h2' => array(
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'align' => array (),
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'class' => array ()),
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'h3' => array(
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'align' => array (),
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'class' => array ()),
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'h4' => array(
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'align' => array (),
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'class' => array ()),
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'h5' => array(
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'align' => array (),
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'class' => array ()),
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'h6' => array(
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'align' => array (),
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'class' => array ()),
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'hr' => array(
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'align' => array (),
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'class' => array (),
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'noshade' => array (),
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'size' => array (),
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'width' => array ()),
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'i' => array(),
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'img' => array(
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'alt' => array (),
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'align' => array (),
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'border' => array (),
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'class' => array (),
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'height' => array (),
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'hspace' => array (),
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'longdesc' => array (),
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'vspace' => array (),
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'src' => array (),
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'style' => array (),
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'width' => array ()),
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'ins' => array(
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'datetime' => array (),
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'cite' => array ()),
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'kbd' => array(),
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'label' => array(
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'for' => array ()),
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'legend' => array(
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'align' => array ()),
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'li' => array (
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'align' => array (),
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'class' => array ()),
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'p' => array(
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'class' => array (),
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'align' => array (),
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'dir' => array(),
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'lang' => array(),
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'style' => array (),
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'xml:lang' => array()),
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'pre' => array(
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'style' => array(),
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'width' => array ()),
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'q' => array(
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'cite' => array ()),
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's' => array(),
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'span' => array (
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'class' => array (),
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'dir' => array (),
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'align' => array (),
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'lang' => array (),
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'style' => array (),
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'title' => array (),
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'xml:lang' => array()),
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'strike' => array(),
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'strong' => array(),
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'sub' => array(),
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'sup' => array(),
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'table' => array(
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'align' => array (),
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'bgcolor' => array (),
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'border' => array (),
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'cellpadding' => array (),
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'cellspacing' => array (),
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'class' => array (),
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'dir' => array(),
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'id' => array(),
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'rules' => array (),
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'style' => array (),
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'summary' => array (),
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'width' => array ()),
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'tbody' => array(
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'align' => array (),
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'char' => array (),
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'charoff' => array (),
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'valign' => array ()),
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'td' => array(
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'abbr' => array (),
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'align' => array (),
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'axis' => array (),
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'bgcolor' => array (),
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'char' => array (),
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'charoff' => array (),
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'class' => array (),
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'colspan' => array (),
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'dir' => array(),
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'headers' => array (),
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'height' => array (),
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'nowrap' => array (),
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'rowspan' => array (),
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'scope' => array (),
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'style' => array (),
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'valign' => array (),
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'width' => array ()),
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'textarea' => array(
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'cols' => array (),
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'rows' => array (),
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'disabled' => array (),
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'name' => array (),
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'readonly' => array ()),
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'tfoot' => array(
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'align' => array (),
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'char' => array (),
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'class' => array (),
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'charoff' => array (),
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'valign' => array ()),
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'th' => array(
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'abbr' => array (),
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'align' => array (),
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'axis' => array (),
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'bgcolor' => array (),
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'char' => array (),
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'charoff' => array (),
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'class' => array (),
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'colspan' => array (),
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'headers' => array (),
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'height' => array (),
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'nowrap' => array (),
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'rowspan' => array (),
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'scope' => array (),
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'valign' => array (),
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'width' => array ()),
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'thead' => array(
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'align' => array (),
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'char' => array (),
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'charoff' => array (),
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'class' => array (),
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'valign' => array ()),
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'title' => array(),
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'tr' => array(
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'align' => array (),
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'bgcolor' => array (),
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'char' => array (),
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'charoff' => array (),
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'class' => array (),
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'style' => array (),
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'valign' => array ()),
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'tt' => array(),
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'u' => array(),
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'ul' => array (
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'class' => array (),
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'style' => array (),
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'type' => array ()),
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'ol' => array (
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'class' => array (),
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'start' => array (),
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'style' => array (),
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'type' => array ()),
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'var' => array ());
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/**
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* Kses allowed HTML elements.
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*
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* @global array $allowedtags
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* @since 1.0.0
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*/
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$allowedtags = array(
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'a' => array(
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'href' => array (),
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'title' => array ()),
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'abbr' => array(
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'title' => array ()),
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'acronym' => array(
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'title' => array ()),
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'b' => array(),
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'blockquote' => array(
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'cite' => array ()),
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// 'br' => array(),
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'cite' => array (),
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'code' => array(),
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'del' => array(
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'datetime' => array ()),
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// 'dd' => array(),
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// 'dl' => array(),
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// 'dt' => array(),
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'em' => array (), 'i' => array (),
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// 'ins' => array('datetime' => array(), 'cite' => array()),
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// 'li' => array(),
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// 'ol' => array(),
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// 'p' => array(),
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'q' => array(
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'cite' => array ()),
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'strike' => array(),
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'strong' => array(),
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// 'sub' => array(),
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// 'sup' => array(),
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// 'u' => array(),
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// 'ul' => array(),
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);
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}
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/**
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* Filters content and keeps only allowable HTML elements.
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*
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* This function makes sure that only the allowed HTML element names, attribute
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* names and attribute values plus only sane HTML entities will occur in
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* $string. You have to remove any slashes from PHP's magic quotes before you
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* call this function.
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*
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* The default allowed protocols are 'http', 'https', 'ftp', 'mailto', 'news',
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* 'irc', 'gopher', 'nntp', 'feed', and finally 'telnet. This covers all common
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* link protocols, except for 'javascript' which should not be allowed for
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* untrusted users.
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*
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* @since 1.0.0
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*
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* @param string $string Content to filter through kses
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* @param array $allowed_html List of allowed HTML elements
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* @param array $allowed_protocols Optional. Allowed protocol in links.
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* @return string Filtered content with only allowed HTML elements
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*/
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function wp_kses($string, $allowed_html, $allowed_protocols = array ('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet')) {
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$string = wp_kses_no_null($string);
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$string = wp_kses_js_entities($string);
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$string = wp_kses_normalize_entities($string);
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$allowed_html_fixed = wp_kses_array_lc($allowed_html);
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$string = wp_kses_hook($string, $allowed_html_fixed, $allowed_protocols); // WP changed the order of these funcs and added args to wp_kses_hook
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return wp_kses_split($string, $allowed_html_fixed, $allowed_protocols);
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}
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/**
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* You add any kses hooks here.
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*
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* There is currently only one kses WordPress hook and it is called here. All
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* parameters are passed to the hooks and expected to recieve a string.
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*
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* @since 1.0.0
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*
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* @param string $string Content to filter through kses
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* @param array $allowed_html List of allowed HTML elements
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* @param array $allowed_protocols Allowed protocol in links
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* @return string Filtered content through 'pre_kses' hook
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*/
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function wp_kses_hook($string, $allowed_html, $allowed_protocols) {
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$string = apply_filters('pre_kses', $string, $allowed_html, $allowed_protocols);
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return $string;
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}
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/**
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* This function returns kses' version number.
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*
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* @since 1.0.0
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*
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* @return string KSES Version Number
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*/
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function wp_kses_version() {
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return '0.2.2';
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}
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/**
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* Searches for HTML tags, no matter how malformed.
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*
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* It also matches stray ">" characters.
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*
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* @since 1.0.0
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*
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* @param string $string Content to filter
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* @param array $allowed_html Allowed HTML elements
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* @param array $allowed_protocols Allowed protocols to keep
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* @return string Content with fixed HTML tags
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*/
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function wp_kses_split($string, $allowed_html, $allowed_protocols) {
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global $pass_allowed_html, $pass_allowed_protocols;
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$pass_allowed_html = $allowed_html;
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$pass_allowed_protocols = $allowed_protocols;
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return preg_replace_callback('%((<!--.*?(-->|$))|(<[^>]*(>|$)|>))%',
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create_function('$match', 'global $pass_allowed_html, $pass_allowed_protocols; return wp_kses_split2($match[1], $pass_allowed_html, $pass_allowed_protocols);'), $string);
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}
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/**
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* Callback for wp_kses_split for fixing malformed HTML tags.
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*
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* This function does a lot of work. It rejects some very malformed things like
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* <:::>. It returns an empty string, if the element isn't allowed (look ma, no
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* strip_tags()!). Otherwise it splits the tag into an element and an attribute
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* list.
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*
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* After the tag is split into an element and an attribute list, it is run
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* through another filter which will remove illegal attributes and once that is
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* completed, will be returned.
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*
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* @access private
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* @since 1.0.0
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* @uses wp_kses_esc_attr()
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*
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* @param string $string Content to filter
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* @param array $allowed_html Allowed HTML elements
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* @param array $allowed_protocols Allowed protocols to keep
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* @return string Fixed HTML element
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*/
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function wp_kses_split2($string, $allowed_html, $allowed_protocols) {
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$string = wp_kses_stripslashes($string);
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if (substr($string, 0, 1) != '<')
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return '>';
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# It matched a ">" character
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if (preg_match('%^<!--(.*?)(-->)?$%', $string, $matches)) {
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$string = str_replace(array('<!--', '-->'), '', $matches[1]);
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while ( $string != $newstring = wp_kses($string, $allowed_html, $allowed_protocols) )
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$string = $newstring;
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if ( $string == '' )
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return '';
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// prevent multiple dashes in comments
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$string = preg_replace('/--+/', '-', $string);
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// prevent three dashes closing a comment
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$string = preg_replace('/-$/', '', $string);
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return "<!--{$string}-->";
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}
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# Allow HTML comments
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if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $string, $matches))
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return '';
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# It's seriously malformed
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$slash = trim($matches[1]);
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$elem = $matches[2];
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$attrlist = $matches[3];
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if (!@isset($allowed_html[strtolower($elem)]))
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return '';
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# They are using a not allowed HTML element
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if ($slash != '')
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return "<$slash$elem>";
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# No attributes are allowed for closing elements
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return wp_kses_esc_attr("$slash$elem", $attrlist, $allowed_html, $allowed_protocols);
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}
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/**
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* Removes all attributes, if none are allowed for this element.
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*
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* If some are allowed it calls wp_kses_hair() to split them further, and then
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* it builds up new HTML code from the data that kses_hair() returns. It also
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* removes "<" and ">" characters, if there are any left. One more thing it does
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* is to check if the tag has a closing XHTML slash, and if it does, it puts one
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* in the returned code as well.
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*
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* @since 1.0.0
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*
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* @param string $element HTML element/tag
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* @param string $attr HTML attributes from HTML element to closing HTML element tag
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* @param array $allowed_html Allowed HTML elements
|
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* @param array $allowed_protocols Allowed protocols to keep
|
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* @return string Sanitized HTML element
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*/
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function wp_kses_esc_attr($element, $attr, $allowed_html, $allowed_protocols) {
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# Is there a closing XHTML slash at the end of the attributes?
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$xhtml_slash = '';
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if (preg_match('%\s/\s*$%', $attr))
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$xhtml_slash = ' /';
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# Are any attributes allowed at all for this element?
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if (@ count($allowed_html[strtolower($element)]) == 0)
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return "<$element$xhtml_slash>";
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# Split it
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$attrarr = wp_kses_hair($attr, $allowed_protocols);
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# Go through $attrarr, and save the allowed attributes for this element
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# in $attr2
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$attr2 = '';
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foreach ($attrarr as $arreach) {
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if (!@ isset ($allowed_html[strtolower($element)][strtolower($arreach['name'])]))
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continue; # the attribute is not allowed
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$current = $allowed_html[strtolower($element)][strtolower($arreach['name'])];
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if ($current == '')
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continue; # the attribute is not allowed
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if (!is_array($current))
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$attr2 .= ' '.$arreach['whole'];
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# there are no checks
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else {
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# there are some checks
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$ok = true;
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foreach ($current as $currkey => $currval)
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if (!wp_kses_check_attr_val($arreach['value'], $arreach['vless'], $currkey, $currval)) {
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$ok = false;
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break;
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}
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if ($ok)
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$attr2 .= ' '.$arreach['whole']; # it passed them
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} # if !is_array($current)
|
|
} # foreach
|
|
|
|
# Remove any "<" or ">" characters
|
|
|
|
$attr2 = preg_replace('/[<>]/', '', $attr2);
|
|
|
|
return "<$element$attr2$xhtml_slash>";
|
|
}
|
|
|
|
/**
|
|
* Builds an attribute list from string containing attributes.
|
|
*
|
|
* This function does a lot of work. It parses an attribute list into an array
|
|
* with attribute data, and tries to do the right thing even if it gets weird
|
|
* input. It will add quotes around attribute values that don't have any quotes
|
|
* or apostrophes around them, to make it easier to produce HTML code that will
|
|
* conform to W3C's HTML specification. It will also remove bad URL protocols
|
|
* from attribute values. It also reduces duplicate attributes by using the
|
|
* attribute defined first (foo='bar' foo='baz' will result in foo='bar').
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $attr Attribute list from HTML element to closing HTML element tag
|
|
* @param array $allowed_protocols Allowed protocols to keep
|
|
* @return array List of attributes after parsing
|
|
*/
|
|
function wp_kses_hair($attr, $allowed_protocols) {
|
|
$attrarr = array ();
|
|
$mode = 0;
|
|
$attrname = '';
|
|
$uris = array('xmlns', 'profile', 'href', 'src', 'cite', 'classid', 'codebase', 'data', 'usemap', 'longdesc', 'action');
|
|
|
|
# Loop through the whole attribute list
|
|
|
|
while (strlen($attr) != 0) {
|
|
$working = 0; # Was the last operation successful?
|
|
|
|
switch ($mode) {
|
|
case 0 : # attribute name, href for instance
|
|
|
|
if (preg_match('/^([-a-zA-Z]+)/', $attr, $match)) {
|
|
$attrname = $match[1];
|
|
$working = $mode = 1;
|
|
$attr = preg_replace('/^[-a-zA-Z]+/', '', $attr);
|
|
}
|
|
|
|
break;
|
|
|
|
case 1 : # equals sign or valueless ("selected")
|
|
|
|
if (preg_match('/^\s*=\s*/', $attr)) # equals sign
|
|
{
|
|
$working = 1;
|
|
$mode = 2;
|
|
$attr = preg_replace('/^\s*=\s*/', '', $attr);
|
|
break;
|
|
}
|
|
|
|
if (preg_match('/^\s+/', $attr)) # valueless
|
|
{
|
|
$working = 1;
|
|
$mode = 0;
|
|
if(FALSE === array_key_exists($attrname, $attrarr)) {
|
|
$attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y');
|
|
}
|
|
$attr = preg_replace('/^\s+/', '', $attr);
|
|
}
|
|
|
|
break;
|
|
|
|
case 2 : # attribute value, a URL after href= for instance
|
|
|
|
if (preg_match('/^"([^"]*)"(\s+|$)/', $attr, $match))
|
|
# "value"
|
|
{
|
|
$thisval = $match[1];
|
|
if ( in_array($attrname, $uris) )
|
|
$thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);
|
|
|
|
if(FALSE === array_key_exists($attrname, $attrarr)) {
|
|
$attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n');
|
|
}
|
|
$working = 1;
|
|
$mode = 0;
|
|
$attr = preg_replace('/^"[^"]*"(\s+|$)/', '', $attr);
|
|
break;
|
|
}
|
|
|
|
if (preg_match("/^'([^']*)'(\s+|$)/", $attr, $match))
|
|
# 'value'
|
|
{
|
|
$thisval = $match[1];
|
|
if ( in_array($attrname, $uris) )
|
|
$thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);
|
|
|
|
if(FALSE === array_key_exists($attrname, $attrarr)) {
|
|
$attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname='$thisval'", 'vless' => 'n');
|
|
}
|
|
$working = 1;
|
|
$mode = 0;
|
|
$attr = preg_replace("/^'[^']*'(\s+|$)/", '', $attr);
|
|
break;
|
|
}
|
|
|
|
if (preg_match("%^([^\s\"']+)(\s+|$)%", $attr, $match))
|
|
# value
|
|
{
|
|
$thisval = $match[1];
|
|
if ( in_array($attrname, $uris) )
|
|
$thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);
|
|
|
|
if(FALSE === array_key_exists($attrname, $attrarr)) {
|
|
$attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n');
|
|
}
|
|
# We add quotes to conform to W3C's HTML spec.
|
|
$working = 1;
|
|
$mode = 0;
|
|
$attr = preg_replace("%^[^\s\"']+(\s+|$)%", '', $attr);
|
|
}
|
|
|
|
break;
|
|
} # switch
|
|
|
|
if ($working == 0) # not well formed, remove and try again
|
|
{
|
|
$attr = wp_kses_html_error($attr);
|
|
$mode = 0;
|
|
}
|
|
} # while
|
|
|
|
if ($mode == 1 && FALSE === array_key_exists($attrname, $attrarr))
|
|
# special case, for when the attribute list ends with a valueless
|
|
# attribute like "selected"
|
|
$attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y');
|
|
|
|
return $attrarr;
|
|
}
|
|
|
|
/**
|
|
* Performs different checks for attribute values.
|
|
*
|
|
* The currently implemented checks are "maxlen", "minlen", "maxval", "minval"
|
|
* and "valueless" with even more checks to come soon.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $value Attribute value
|
|
* @param string $vless Whether the value is valueless or not. Use 'y' or 'n'
|
|
* @param string $checkname What $checkvalue is checking for.
|
|
* @param mixed $checkvalue What constraint the value should pass
|
|
* @return bool Whether check passes (true) or not (false)
|
|
*/
|
|
function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue) {
|
|
$ok = true;
|
|
|
|
switch (strtolower($checkname)) {
|
|
case 'maxlen' :
|
|
# The maxlen check makes sure that the attribute value has a length not
|
|
# greater than the given value. This can be used to avoid Buffer Overflows
|
|
# in WWW clients and various Internet servers.
|
|
|
|
if (strlen($value) > $checkvalue)
|
|
$ok = false;
|
|
break;
|
|
|
|
case 'minlen' :
|
|
# The minlen check makes sure that the attribute value has a length not
|
|
# smaller than the given value.
|
|
|
|
if (strlen($value) < $checkvalue)
|
|
$ok = false;
|
|
break;
|
|
|
|
case 'maxval' :
|
|
# The maxval check does two things: it checks that the attribute value is
|
|
# an integer from 0 and up, without an excessive amount of zeroes or
|
|
# whitespace (to avoid Buffer Overflows). It also checks that the attribute
|
|
# value is not greater than the given value.
|
|
# This check can be used to avoid Denial of Service attacks.
|
|
|
|
if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))
|
|
$ok = false;
|
|
if ($value > $checkvalue)
|
|
$ok = false;
|
|
break;
|
|
|
|
case 'minval' :
|
|
# The minval check checks that the attribute value is a positive integer,
|
|
# and that it is not smaller than the given value.
|
|
|
|
if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))
|
|
$ok = false;
|
|
if ($value < $checkvalue)
|
|
$ok = false;
|
|
break;
|
|
|
|
case 'valueless' :
|
|
# The valueless check checks if the attribute has a value
|
|
# (like <a href="blah">) or not (<option selected>). If the given value
|
|
# is a "y" or a "Y", the attribute must not have a value.
|
|
# If the given value is an "n" or an "N", the attribute must have one.
|
|
|
|
if (strtolower($checkvalue) != $vless)
|
|
$ok = false;
|
|
break;
|
|
} # switch
|
|
|
|
return $ok;
|
|
}
|
|
|
|
/**
|
|
* Sanitize string from bad protocols.
|
|
*
|
|
* This function removes all non-allowed protocols from the beginning of
|
|
* $string. It ignores whitespace and the case of the letters, and it does
|
|
* understand HTML entities. It does its work in a while loop, so it won't be
|
|
* fooled by a string like "javascript:javascript:alert(57)".
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $string Content to filter bad protocols from
|
|
* @param array $allowed_protocols Allowed protocols to keep
|
|
* @return string Filtered content
|
|
*/
|
|
function wp_kses_bad_protocol($string, $allowed_protocols) {
|
|
$string = wp_kses_no_null($string);
|
|
$string = preg_replace('/\xad+/', '', $string); # deals with Opera "feature"
|
|
$string2 = $string.'a';
|
|
|
|
while ($string != $string2) {
|
|
$string2 = $string;
|
|
$string = wp_kses_bad_protocol_once($string, $allowed_protocols);
|
|
} # while
|
|
|
|
return $string;
|
|
}
|
|
|
|
/**
|
|
* Removes any NULL characters in $string.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $string
|
|
* @return string
|
|
*/
|
|
function wp_kses_no_null($string) {
|
|
$string = preg_replace('/\0+/', '', $string);
|
|
$string = preg_replace('/(\\\\0)+/', '', $string);
|
|
|
|
return $string;
|
|
}
|
|
|
|
/**
|
|
* Strips slashes from in front of quotes.
|
|
*
|
|
* This function changes the character sequence \" to just ". It leaves all
|
|
* other slashes alone. It's really weird, but the quoting from
|
|
* preg_replace(//e) seems to require this.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $string String to strip slashes
|
|
* @return string Fixed strings with quoted slashes
|
|
*/
|
|
function wp_kses_stripslashes($string) {
|
|
return preg_replace('%\\\\"%', '"', $string);
|
|
}
|
|
|
|
/**
|
|
* Goes through an array and changes the keys to all lower case.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param array $inarray Unfiltered array
|
|
* @return array Fixed array with all lowercase keys
|
|
*/
|
|
function wp_kses_array_lc($inarray) {
|
|
$outarray = array ();
|
|
|
|
foreach ( (array) $inarray as $inkey => $inval) {
|
|
$outkey = strtolower($inkey);
|
|
$outarray[$outkey] = array ();
|
|
|
|
foreach ( (array) $inval as $inkey2 => $inval2) {
|
|
$outkey2 = strtolower($inkey2);
|
|
$outarray[$outkey][$outkey2] = $inval2;
|
|
} # foreach $inval
|
|
} # foreach $inarray
|
|
|
|
return $outarray;
|
|
}
|
|
|
|
/**
|
|
* Removes the HTML JavaScript entities found in early versions of Netscape 4.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $string
|
|
* @return string
|
|
*/
|
|
function wp_kses_js_entities($string) {
|
|
return preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string);
|
|
}
|
|
|
|
/**
|
|
* Handles parsing errors in wp_kses_hair().
|
|
*
|
|
* The general plan is to remove everything to and including some whitespace,
|
|
* but it deals with quotes and apostrophes as well.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $string
|
|
* @return string
|
|
*/
|
|
function wp_kses_html_error($string) {
|
|
return preg_replace('/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string);
|
|
}
|
|
|
|
/**
|
|
* Sanitizes content from bad protocols and other characters.
|
|
*
|
|
* This function searches for URL protocols at the beginning of $string, while
|
|
* handling whitespace and HTML entities.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $string Content to check for bad protocols
|
|
* @param string $allowed_protocols Allowed protocols
|
|
* @return string Sanitized content
|
|
*/
|
|
function wp_kses_bad_protocol_once($string, $allowed_protocols) {
|
|
global $_kses_allowed_protocols;
|
|
$_kses_allowed_protocols = $allowed_protocols;
|
|
|
|
$string2 = preg_split('/:|:|:/i', $string, 2);
|
|
if ( isset($string2[1]) && !preg_match('%/\?%', $string2[0]) )
|
|
$string = wp_kses_bad_protocol_once2($string2[0]) . trim($string2[1]);
|
|
else
|
|
$string = preg_replace_callback('/^((&[^;]*;|[\sA-Za-z0-9])*)'.'(:|:|&#[Xx]3[Aa];)\s*/', 'wp_kses_bad_protocol_once2', $string);
|
|
|
|
return $string;
|
|
}
|
|
|
|
/**
|
|
* Callback for wp_kses_bad_protocol_once() regular expression.
|
|
*
|
|
* This function processes URL protocols, checks to see if they're in the
|
|
* white-list or not, and returns different data depending on the answer.
|
|
*
|
|
* @access private
|
|
* @since 1.0.0
|
|
*
|
|
* @param mixed $matches string or preg_replace_callback() matches array to check for bad protocols
|
|
* @return string Sanitized content
|
|
*/
|
|
function wp_kses_bad_protocol_once2($matches) {
|
|
global $_kses_allowed_protocols;
|
|
|
|
if ( is_array($matches) ) {
|
|
if ( ! isset($matches[1]) || empty($matches[1]) )
|
|
return '';
|
|
|
|
$string = $matches[1];
|
|
} else {
|
|
$string = $matches;
|
|
}
|
|
|
|
$string2 = wp_kses_decode_entities($string);
|
|
$string2 = preg_replace('/\s/', '', $string2);
|
|
$string2 = wp_kses_no_null($string2);
|
|
$string2 = preg_replace('/\xad+/', '', $string2);
|
|
# deals with Opera "feature"
|
|
$string2 = strtolower($string2);
|
|
|
|
$allowed = false;
|
|
foreach ( (array) $_kses_allowed_protocols as $one_protocol)
|
|
if (strtolower($one_protocol) == $string2) {
|
|
$allowed = true;
|
|
break;
|
|
}
|
|
|
|
if ($allowed)
|
|
return "$string2:";
|
|
else
|
|
return '';
|
|
}
|
|
|
|
/**
|
|
* Converts and fixes HTML entities.
|
|
*
|
|
* This function normalizes HTML entities. It will convert "AT&T" to the correct
|
|
* "AT&T", ":" to ":", "&#XYZZY;" to "&#XYZZY;" and so on.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $string Content to normalize entities
|
|
* @return string Content with normalized entities
|
|
*/
|
|
function wp_kses_normalize_entities($string) {
|
|
# Disarm all entities by converting & to &
|
|
|
|
$string = str_replace('&', '&', $string);
|
|
|
|
# Change back the allowed entities in our entity whitelist
|
|
|
|
$string = preg_replace('/&([A-Za-z][A-Za-z0-9]{0,19});/', '&\\1;', $string);
|
|
$string = preg_replace_callback('/&#0*([0-9]{1,5});/', 'wp_kses_normalize_entities2', $string);
|
|
$string = preg_replace_callback('/&#([Xx])0*(([0-9A-Fa-f]{2}){1,2});/', 'wp_kses_normalize_entities3', $string);
|
|
|
|
return $string;
|
|
}
|
|
|
|
/**
|
|
* Callback for wp_kses_normalize_entities() regular expression.
|
|
*
|
|
* This function helps wp_kses_normalize_entities() to only accept 16 bit values
|
|
* and nothing more for &#number; entities.
|
|
*
|
|
* @access private
|
|
* @since 1.0.0
|
|
*
|
|
* @param array $matches preg_replace_callback() matches array
|
|
* @return string Correctly encoded entity
|
|
*/
|
|
function wp_kses_normalize_entities2($matches) {
|
|
if ( ! isset($matches[1]) || empty($matches[1]) )
|
|
return '';
|
|
|
|
$i = $matches[1];
|
|
return ( ( ! valid_unicode($i) ) || ($i > 65535) ? "&#$i;" : "&#$i;" );
|
|
}
|
|
|
|
/**
|
|
* Callback for wp_kses_normalize_entities() for regular expression.
|
|
*
|
|
* This function helps wp_kses_normalize_entities() to only accept valid Unicode
|
|
* numeric entities in hex form.
|
|
*
|
|
* @access private
|
|
*
|
|
* @param array $matches preg_replace_callback() matches array
|
|
* @return string Correctly encoded entity
|
|
*/
|
|
function wp_kses_normalize_entities3($matches) {
|
|
if ( ! isset($matches[2]) || empty($matches[2]) )
|
|
return '';
|
|
|
|
$hexchars = $matches[2];
|
|
return ( ( ! valid_unicode(hexdec($hexchars)) ) ? "&#x$hexchars;" : "&#x$hexchars;" );
|
|
}
|
|
|
|
/**
|
|
* Helper function to determine if a Unicode value is valid.
|
|
*
|
|
* @param int $i Unicode value
|
|
* @return bool true if the value was a valid Unicode number
|
|
*/
|
|
function valid_unicode($i) {
|
|
return ( $i == 0x9 || $i == 0xa || $i == 0xd ||
|
|
($i >= 0x20 && $i <= 0xd7ff) ||
|
|
($i >= 0xe000 && $i <= 0xfffd) ||
|
|
($i >= 0x10000 && $i <= 0x10ffff) );
|
|
}
|
|
|
|
/**
|
|
* Convert all entities to their character counterparts.
|
|
*
|
|
* This function decodes numeric HTML entities (A and A). It doesn't do
|
|
* anything with other entities like ä, but we don't need them in the URL
|
|
* protocol whitelisting system anyway.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $string Content to change entities
|
|
* @return string Content after decoded entities
|
|
*/
|
|
function wp_kses_decode_entities($string) {
|
|
$string = preg_replace_callback('/&#([0-9]+);/', create_function('$match', 'return chr($match[1]);'), $string);
|
|
$string = preg_replace_callback('/&#[Xx]([0-9A-Fa-f]+);/', create_function('$match', 'return chr(hexdec($match[1]));'), $string);
|
|
|
|
return $string;
|
|
}
|
|
|
|
/**
|
|
* Sanitize content with allowed HTML Kses rules.
|
|
*
|
|
* @since 1.0.0
|
|
* @uses $allowedtags
|
|
*
|
|
* @param string $data Content to filter
|
|
* @return string Filtered content
|
|
*/
|
|
function wp_filter_kses($data) {
|
|
global $allowedtags;
|
|
return addslashes( wp_kses(stripslashes( $data ), $allowedtags) );
|
|
}
|
|
|
|
/**
|
|
* Sanitize content for allowed HTML tags for post content.
|
|
*
|
|
* Post content refers to the page contents of the 'post' type and not $_POST
|
|
* data from forms.
|
|
*
|
|
* @since 2.0.0
|
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* @uses $allowedposttags
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*
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* @param string $data Post content to filter
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* @return string Filtered post content with allowed HTML tags and attributes intact.
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*/
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function wp_filter_post_kses($data) {
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global $allowedposttags;
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return addslashes ( wp_kses(stripslashes( $data ), $allowedposttags) );
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}
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/**
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* Strips all of the HTML in the content.
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*
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* @since 2.1.0
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*
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* @param string $data Content to strip all HTML from
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* @return string Filtered content without any HTML
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*/
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function wp_filter_nohtml_kses($data) {
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return addslashes ( wp_kses(stripslashes( $data ), array()) );
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}
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/**
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* Adds all Kses input form content filters.
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*
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* All hooks have default priority. The wp_filter_kses() function is added to
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* the 'pre_comment_content' and 'title_save_pre' hooks.
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*
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* The wp_filter_post_kses() function is added to the 'content_save_pre',
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* 'excerpt_save_pre', and 'content_filtered_save_pre' hooks.
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*
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* @since 2.0.0
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* @uses add_filter() See description for what functions are added to what hooks.
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*/
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function kses_init_filters() {
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// Normal filtering.
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add_filter('pre_comment_content', 'wp_filter_kses');
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add_filter('title_save_pre', 'wp_filter_kses');
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// Post filtering
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add_filter('content_save_pre', 'wp_filter_post_kses');
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add_filter('excerpt_save_pre', 'wp_filter_post_kses');
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add_filter('content_filtered_save_pre', 'wp_filter_post_kses');
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}
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|
|
/**
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* Removes all Kses input form content filters.
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*
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* A quick procedural method to removing all of the filters that kses uses for
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* content in WordPress Loop.
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*
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* Does not remove the kses_init() function from 'init' hook (priority is
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* default). Also does not remove kses_init() function from 'set_current_user'
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* hook (priority is also default).
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*
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* @since 2.0.6
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*/
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function kses_remove_filters() {
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// Normal filtering.
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remove_filter('pre_comment_content', 'wp_filter_kses');
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remove_filter('title_save_pre', 'wp_filter_kses');
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|
|
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// Post filtering
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remove_filter('content_save_pre', 'wp_filter_post_kses');
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remove_filter('excerpt_save_pre', 'wp_filter_post_kses');
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remove_filter('content_filtered_save_pre', 'wp_filter_post_kses');
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}
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|
/**
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|
* Sets up most of the Kses filters for input form content.
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|
*
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* If you remove the kses_init() function from 'init' hook and
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* 'set_current_user' (priority is default), then none of the Kses filter hooks
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* will be added.
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*
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* First removes all of the Kses filters in case the current user does not need
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* to have Kses filter the content. If the user does not have unfiltered html
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* capability, then Kses filters are added.
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*
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* @uses kses_remove_filters() Removes the Kses filters
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|
* @uses kses_init_filters() Adds the Kses filters back if the user
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* does not have unfiltered HTML capability.
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* @since 2.0.0
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*/
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function kses_init() {
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kses_remove_filters();
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if (current_user_can('unfiltered_html') == false)
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kses_init_filters();
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}
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add_action('init', 'kses_init');
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add_action('set_current_user', 'kses_init');
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?>
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