743 lines
24 KiB
PHP
743 lines
24 KiB
PHP
<?php
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// Added wp_ prefix to avoid conflicts with existing kses users
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# kses 0.2.2 - HTML/XHTML filter that only allows some elements and attributes
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# Copyright (C) 2002, 2003, 2005 Ulf Harnhammar
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# *** CONTACT INFORMATION ***
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#
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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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if (!defined('CUSTOM_TAGS'))
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define('CUSTOM_TAGS', false);
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// You can override this in your my-hacks.php file
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if (!CUSTOM_TAGS) {
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$allowedposttags = array(
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'address' => array(),
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'a' => array(
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'href' => array(), 'title' => array(),
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'rel' => array(), 'rev' => array(),
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'name' => array()
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),
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'abbr' => array(
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'title' => array(), 'class' => array()
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),
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'acronym' => array(
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'title' => array()
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),
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'b' => array(),
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'big' => array(),
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'blockquote' => array(
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'cite' => array(), 'xml:lang' => array(),
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'lang' => array()
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),
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'br' => array(),
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'button' => array(
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'disabled' => array(), 'name' => array(),
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'type' => array(), 'value' => array()
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),
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'caption' => array(
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'align' => array()
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),
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'code' => array(),
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'col' => array(
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'align' => array(), 'char' => array(),
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'charoff' => array(), 'span' => array(),
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'valign' => array(), 'width' => array()
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),
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'del' => array(
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'datetime' => array()
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),
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'dd' => array(),
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'div' => array(
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'align' => array(), 'xml:lang' => array(),
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'lang' => array()
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),
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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(), 'face' => array(),
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'size' => array()
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),
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'form' => array(
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'action' => array(), 'accept' => array(),
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'accept-charset' => array(), 'enctype' => array(),
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'method' => array(), 'name' => array(),
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'target' => array()
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),
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'h1' => array(
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'align' => array()
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),
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'h2' => array(
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'align' => array()
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),
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'h3' => array(
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'align' => array()
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),
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'h4' => array(
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'align' => array()
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),
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'h5' => array(
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'align' => array()
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),
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'h6' => array(
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'align' => array()
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),
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'hr' => array(
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'align' => array(), 'noshade' => array(),
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'size' => array(), 'width' => array()
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),
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'i' => array(),
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'img' => array(
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'alt' => array(), 'align' => array(),
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'border' => array(), 'height' => array(),
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'hspace' => array(), 'longdesc' => array(),
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'vspace' => array(), 'src' => array(),
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'width' => array()
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),
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'ins' => array(
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'datetime' => array(), 'cite' => array()
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),
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'kbd' => array(),
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'label' => array(
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'for' => array()
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),
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'legend' => array(
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'align' => array()
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),
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'li' => array(),
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'p' => array(
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'align' => array(), 'xml:lang' => array(),
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'lang' => array()
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),
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'pre' => array(
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'width' => array()
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),
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'q' => array(
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'cite' => array()
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),
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's' => 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(), 'bgcolor' => array(),
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'border' => array(), 'cellpadding' => array(),
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'cellspacing' => array(), 'rules' => array(),
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'summary' => array(), 'width' => array()
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),
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'tbody' => array(
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'align' => array(), 'char' => array(),
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'charoff' => array(), 'valign' => array()
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),
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'td' => array(
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'abbr' => array(), 'align' => array(),
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'axis' => array(), 'bgcolor' => array(),
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'char' => array(), 'charoff' => array(),
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'colspan' => array(), 'headers' => array(),
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'height' => array(), 'nowrap' => array(),
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'rowspan' => array(), 'scope' => array(),
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'valign' => array(), 'width' => array()
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),
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'textarea' => array(
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'cols' => array(), 'rows' => array(),
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'disabled' => array(), 'name' => array(),
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'readonly' => array()
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),
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'tfoot' => array(
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'align' => array(), 'char' => array(),
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'charoff' => array(), 'valign' => array()
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),
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'th' => array(
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'abbr' => array(), 'align' => array(),
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'axis' => array(), 'bgcolor' => array(),
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'char' => array(), 'charoff' => array(),
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'colspan' => array(), 'headers' => array(),
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'height' => array(), 'nowrap' => array(),
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'rowspan' => array(), 'scope' => array(),
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'valign' => array(), 'width' => array()
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),
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'thead' => array(
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'align' => array(), 'char' => array(),
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'charoff' => array(), 'valign' => array()
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),
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'title' => array(),
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'tr' => array(
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'align' => array(), 'bgcolor' => array(),
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'char' => array(), 'charoff' => array(),
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'valign' => array()
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),
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'tt' => array(),
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'u' => array(),
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'ul' => array(),
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'ol' => array(),
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'var' => array()
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);
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$allowedtags = array(
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'a' => array(
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'href' => array(), 'title' => array()
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),
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'abbr' => array(
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'title' => array()
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),
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'acronym' => array(
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'title' => array()
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),
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'b' => array(),
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'blockquote' => array(
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'cite' => array()
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),
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// 'br' => array(),
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'code' => array(),
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// 'del' => array('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(),
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'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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'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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function wp_kses($string, $allowed_html, $allowed_protocols = array ('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet'))
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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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# $string. You have to remove any slashes from PHP's magic quotes before you
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# call this function.
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###############################################################################
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{
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$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, $allowed_protocols);
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} # function wp_kses
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function wp_kses_hook($string, $allowed_html, $allowed_protocols)
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###############################################################################
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# You add any kses hooks here.
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###############################################################################
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{
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$string = apply_filters( 'pre_kses', $string );
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return $string;
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} # function wp_kses_hook
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function wp_kses_version()
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###############################################################################
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# This function returns kses' version number.
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###############################################################################
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{
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return '0.2.2';
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} # function wp_kses_version
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function wp_kses_split($string, $allowed_html, $allowed_protocols)
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###############################################################################
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# This function searches for HTML tags, no matter how malformed. It also
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# matches stray ">" characters.
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###############################################################################
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{
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return preg_replace('%((<!--.*?(-->|$))|(<[^>]*(>|$)|>))%e',
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"wp_kses_split2('\\1', \$allowed_html, ".'$allowed_protocols)', $string);
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} # function wp_kses_split
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function wp_kses_split2($string, $allowed_html, $allowed_protocols)
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###############################################################################
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# This function does a lot of work. It rejects some very malformed things
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# like <:::>. It returns an empty string, if the element isn't allowed (look
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# ma, no strip_tags()!). Otherwise it splits the tag into an element and an
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# attribute list.
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###############################################################################
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{
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$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 ( $string == '' )
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return '';
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return "<!--{$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_attr("$slash$elem", $attrlist, $allowed_html, $allowed_protocols);
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} # function wp_kses_split2
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function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols)
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###############################################################################
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# This function removes all attributes, if none are allowed for this element.
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# If some are allowed it calls wp_kses_hair() to split them further, and then it
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# builds up new HTML code from the data that kses_hair() returns. It also
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# removes "<" and ">" characters, if there are any left. One more thing it
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# does is to check if the tag has a closing XHTML slash, and if it does,
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# it puts one in the returned code as well.
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###############################################################################
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{
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# Is there a closing XHTML slash at the end of the attributes?
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$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)
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} # foreach
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# Remove any "<" or ">" characters
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$attr2 = preg_replace('/[<>]/', '', $attr2);
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return "<$element$attr2$xhtml_slash>";
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} # function wp_kses_attr
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function wp_kses_hair($attr, $allowed_protocols)
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###############################################################################
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# This function does a lot of work. It parses an attribute list into an array
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# with attribute data, and tries to do the right thing even if it gets weird
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# input. It will add quotes around attribute values that don't have any quotes
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# or apostrophes around them, to make it easier to produce HTML code that will
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# conform to W3C's HTML specification. It will also remove bad URL protocols
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# from attribute values.
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###############################################################################
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{
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$attrarr = array ();
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$mode = 0;
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$attrname = '';
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# Loop through the whole attribute list
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while (strlen($attr) != 0) {
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$working = 0; # Was the last operation successful?
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switch ($mode) {
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case 0 : # attribute name, href for instance
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if (preg_match('/^([-a-zA-Z]+)/', $attr, $match)) {
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$attrname = $match[1];
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$working = $mode = 1;
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$attr = preg_replace('/^[-a-zA-Z]+/', '', $attr);
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}
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break;
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case 1 : # equals sign or valueless ("selected")
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if (preg_match('/^\s*=\s*/', $attr)) # equals sign
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{
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$working = 1;
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$mode = 2;
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$attr = preg_replace('/^\s*=\s*/', '', $attr);
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break;
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}
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if (preg_match('/^\s+/', $attr)) # valueless
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{
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$working = 1;
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$mode = 0;
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$attrarr[] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y');
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$attr = preg_replace('/^\s+/', '', $attr);
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}
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break;
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case 2 : # attribute value, a URL after href= for instance
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if (preg_match('/^"([^"]*)"(\s+|$)/', $attr, $match))
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# "value"
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{
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$thisval = wp_kses_bad_protocol($match[1], $allowed_protocols);
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$attrarr[] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n');
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$working = 1;
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$mode = 0;
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$attr = preg_replace('/^"[^"]*"(\s+|$)/', '', $attr);
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break;
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}
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if (preg_match("/^'([^']*)'(\s+|$)/", $attr, $match))
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# 'value'
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{
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$thisval = wp_kses_bad_protocol($match[1], $allowed_protocols);
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$attrarr[] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname='$thisval'", 'vless' => 'n');
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$working = 1;
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$mode = 0;
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$attr = preg_replace("/^'[^']*'(\s+|$)/", '', $attr);
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break;
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}
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if (preg_match("%^([^\s\"']+)(\s+|$)%", $attr, $match))
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# value
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{
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$thisval = wp_kses_bad_protocol($match[1], $allowed_protocols);
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$attrarr[] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n');
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# We add quotes to conform to W3C's HTML spec.
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$working = 1;
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$mode = 0;
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$attr = preg_replace("%^[^\s\"']+(\s+|$)%", '', $attr);
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}
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break;
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} # switch
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if ($working == 0) # not well formed, remove and try again
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{
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$attr = wp_kses_html_error($attr);
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$mode = 0;
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}
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} # while
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if ($mode == 1)
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# special case, for when the attribute list ends with a valueless
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# attribute like "selected"
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$attrarr[] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y');
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return $attrarr;
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} # function wp_kses_hair
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function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue)
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###############################################################################
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# This function performs different checks for attribute values. The currently
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# implemented checks are "maxlen", "minlen", "maxval", "minval" and "valueless"
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# with even more checks to come soon.
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###############################################################################
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{
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$ok = true;
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switch (strtolower($checkname)) {
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case 'maxlen' :
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# The maxlen check makes sure that the attribute value has a length not
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# greater than the given value. This can be used to avoid Buffer Overflows
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# in WWW clients and various Internet servers.
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if (strlen($value) > $checkvalue)
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$ok = false;
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break;
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case 'minlen' :
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# The minlen check makes sure that the attribute value has a length not
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# smaller than the given value.
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if (strlen($value) < $checkvalue)
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$ok = false;
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break;
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case 'maxval' :
|
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# The maxval check does two things: it checks that the attribute value is
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# an integer from 0 and up, without an excessive amount of zeroes or
|
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# whitespace (to avoid Buffer Overflows). It also checks that the attribute
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# value is not greater than the given value.
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# 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 $ok;
|
|
} # function wp_kses_check_attr_val
|
|
|
|
function wp_kses_bad_protocol($string, $allowed_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)".
|
|
###############################################################################
|
|
{
|
|
$string = wp_kses_no_null($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 $string;
|
|
} # function wp_kses_bad_protocol
|
|
|
|
function wp_kses_no_null($string)
|
|
###############################################################################
|
|
# This function removes any NULL characters in $string.
|
|
###############################################################################
|
|
{
|
|
$string = preg_replace('/\0+/', '', $string);
|
|
$string = preg_replace('/(\\\\0)+/', '', $string);
|
|
|
|
return $string;
|
|
} # function wp_kses_no_null
|
|
|
|
function wp_kses_stripslashes($string)
|
|
###############################################################################
|
|
# 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.
|
|
###############################################################################
|
|
{
|
|
return preg_replace('%\\\\"%', '"', $string);
|
|
} # function wp_kses_stripslashes
|
|
|
|
function wp_kses_array_lc($inarray)
|
|
###############################################################################
|
|
# This function goes through an array, and changes the keys to all lower case.
|
|
###############################################################################
|
|
{
|
|
$outarray = array ();
|
|
|
|
foreach ($inarray as $inkey => $inval) {
|
|
$outkey = strtolower($inkey);
|
|
$outarray[$outkey] = array ();
|
|
|
|
foreach ($inval as $inkey2 => $inval2) {
|
|
$outkey2 = strtolower($inkey2);
|
|
$outarray[$outkey][$outkey2] = $inval2;
|
|
} # foreach $inval
|
|
} # foreach $inarray
|
|
|
|
return $outarray;
|
|
} # function wp_kses_array_lc
|
|
|
|
function wp_kses_js_entities($string)
|
|
###############################################################################
|
|
# This function removes the HTML JavaScript entities found in early versions of
|
|
# Netscape 4.
|
|
###############################################################################
|
|
{
|
|
return preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string);
|
|
} # function wp_kses_js_entities
|
|
|
|
function wp_kses_html_error($string)
|
|
###############################################################################
|
|
# This function deals with 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.
|
|
###############################################################################
|
|
{
|
|
return preg_replace('/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string);
|
|
} # function wp_kses_html_error
|
|
|
|
function wp_kses_bad_protocol_once($string, $allowed_protocols)
|
|
###############################################################################
|
|
# This function searches for URL protocols at the beginning of $string, while
|
|
# handling whitespace and HTML entities.
|
|
###############################################################################
|
|
{
|
|
return preg_replace('/^((&[^;]*;|[\sA-Za-z0-9])*)'.'(:|:|&#[Xx]3[Aa];)\s*/e', 'wp_kses_bad_protocol_once2("\\1", $allowed_protocols)', $string);
|
|
} # function wp_kses_bad_protocol_once
|
|
|
|
function wp_kses_bad_protocol_once2($string, $allowed_protocols)
|
|
###############################################################################
|
|
# 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.
|
|
###############################################################################
|
|
{
|
|
$string2 = wp_kses_decode_entities($string);
|
|
$string2 = preg_replace('/\s/', '', $string2);
|
|
$string2 = wp_kses_no_null($string2);
|
|
$string2 = preg_replace('/\xad+/', '', $string2);
|
|
# deals with Opera "feature"
|
|
$string2 = strtolower($string2);
|
|
|
|
$allowed = false;
|
|
foreach ($allowed_protocols as $one_protocol)
|
|
if (strtolower($one_protocol) == $string2) {
|
|
$allowed = true;
|
|
break;
|
|
}
|
|
|
|
if ($allowed)
|
|
return "$string2:";
|
|
else
|
|
return '';
|
|
} # function wp_kses_bad_protocol_once2
|
|
|
|
function wp_kses_normalize_entities($string)
|
|
###############################################################################
|
|
# This function normalizes HTML entities. It will convert "AT&T" to the correct
|
|
# "AT&T", ":" to ":", "&#XYZZY;" to "&#XYZZY;" and so on.
|
|
###############################################################################
|
|
{
|
|
# 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('/&#0*([0-9]{1,5});/e', 'wp_kses_normalize_entities2("\\1")', $string);
|
|
$string = preg_replace('/&#([Xx])0*(([0-9A-Fa-f]{2}){1,2});/', '&#\\1\\2;', $string);
|
|
|
|
return $string;
|
|
} # function wp_kses_normalize_entities
|
|
|
|
function wp_kses_normalize_entities2($i)
|
|
###############################################################################
|
|
# This function helps wp_kses_normalize_entities() to only accept 16 bit values
|
|
# and nothing more for &#number; entities.
|
|
###############################################################################
|
|
{
|
|
return (($i > 65535) ? "&#$i;" : "&#$i;");
|
|
} # function wp_kses_normalize_entities2
|
|
|
|
function wp_kses_decode_entities($string)
|
|
###############################################################################
|
|
# 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.
|
|
###############################################################################
|
|
{
|
|
$string = preg_replace('/&#([0-9]+);/e', 'chr("\\1")', $string);
|
|
$string = preg_replace('/&#[Xx]([0-9A-Fa-f]+);/e', 'chr(hexdec("\\1"))', $string);
|
|
|
|
return $string;
|
|
} # function wp_kses_decode_entities
|
|
|
|
function wp_filter_kses($data) {
|
|
global $allowedtags;
|
|
return addslashes( wp_kses(stripslashes( $data ), $allowedtags) );
|
|
}
|
|
|
|
function wp_filter_post_kses($data) {
|
|
global $allowedposttags;
|
|
return addslashes ( wp_kses(stripslashes( $data ), $allowedposttags) );
|
|
}
|
|
|
|
function wp_filter_nohtml_kses($data) {
|
|
return addslashes ( wp_kses(stripslashes( $data ), array()) );
|
|
}
|
|
|
|
function kses_init_filters() {
|
|
// Normal filtering.
|
|
add_filter('pre_comment_content', 'wp_filter_kses');
|
|
add_filter('title_save_pre', 'wp_filter_kses');
|
|
|
|
// Post filtering
|
|
add_filter('content_save_pre', 'wp_filter_post_kses');
|
|
add_filter('excerpt_save_pre', 'wp_filter_post_kses');
|
|
add_filter('content_filtered_save_pre', 'wp_filter_post_kses');
|
|
}
|
|
|
|
function kses_remove_filters() {
|
|
// Normal filtering.
|
|
remove_filter('pre_comment_content', 'wp_filter_kses');
|
|
remove_filter('title_save_pre', 'wp_filter_kses');
|
|
|
|
// Post filtering
|
|
remove_filter('content_save_pre', 'wp_filter_post_kses');
|
|
remove_filter('excerpt_save_pre', 'wp_filter_post_kses');
|
|
remove_filter('content_filtered_save_pre', 'wp_filter_post_kses');
|
|
}
|
|
|
|
function kses_init() {
|
|
kses_remove_filters();
|
|
|
|
if (current_user_can('unfiltered_html') == false)
|
|
kses_init_filters();
|
|
}
|
|
|
|
add_action('init', 'kses_init');
|
|
add_action('set_current_user', 'kses_init');
|
|
?>
|