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1923 lines
52 KiB
PHP
1923 lines
52 KiB
PHP
<?php
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/**
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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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*
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* This program is free software and open source software; you can redistribute
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* it and/or modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the License,
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* or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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* http://www.gnu.org/licenses/gpl.html
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*
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* [kses strips evil scripts!]
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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 <http://advogato.org/person/metaur/>
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*
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* @package External
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* @subpackage KSES
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*
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*/
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/**
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* You can override this in a plugin.
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*
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* The {@see 'wp_kses_allowed_html'} filter is more powerful and supplies context.
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*
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* `CUSTOM_TAGS` is not recommended and should be considered deprecated.
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*
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* @see wp_kses_allowed_html()
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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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// Ensure that these variables are added to the global namespace
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// (e.g. if using namespaces / autoload in the current PHP environment).
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global $allowedposttags, $allowedtags, $allowedentitynames;
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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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'href' => true,
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'rel' => true,
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'rev' => true,
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'name' => true,
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'target' => true,
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'download' => array(
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'valueless' => 'y',
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),
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),
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'abbr' => array(),
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'acronym' => array(),
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'area' => array(
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'alt' => true,
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'coords' => true,
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'href' => true,
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'nohref' => true,
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'shape' => true,
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'target' => true,
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),
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'article' => array(
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'align' => true,
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'dir' => true,
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'lang' => true,
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'xml:lang' => true,
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),
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'aside' => array(
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'align' => true,
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'dir' => true,
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'lang' => true,
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'xml:lang' => true,
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),
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'audio' => array(
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'autoplay' => true,
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'controls' => true,
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'loop' => true,
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'muted' => true,
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'preload' => true,
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'src' => true,
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),
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'b' => array(),
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'bdo' => array(
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'dir' => true,
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),
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'big' => array(),
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'blockquote' => array(
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'cite' => true,
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'lang' => true,
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'xml:lang' => true,
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),
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'br' => array(),
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'button' => array(
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'disabled' => true,
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'name' => true,
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'type' => true,
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'value' => true,
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),
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'caption' => array(
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'align' => true,
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),
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'cite' => array(
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'dir' => true,
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'lang' => true,
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),
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'code' => array(),
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'col' => array(
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'align' => true,
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'char' => true,
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'charoff' => true,
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'span' => true,
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'dir' => true,
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'valign' => true,
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'width' => true,
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),
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'colgroup' => array(
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'align' => true,
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'char' => true,
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'charoff' => true,
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'span' => true,
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'valign' => true,
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'width' => true,
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),
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'del' => array(
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'datetime' => true,
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),
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'dd' => array(),
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'dfn' => array(),
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'details' => array(
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'align' => true,
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'dir' => true,
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'lang' => true,
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'open' => true,
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'xml:lang' => true,
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),
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'div' => array(
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'align' => true,
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'dir' => true,
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'lang' => true,
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'xml:lang' => true,
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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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'figure' => array(
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'align' => true,
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'dir' => true,
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'lang' => true,
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'xml:lang' => true,
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),
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'figcaption' => array(
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'align' => true,
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'dir' => true,
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'lang' => true,
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'xml:lang' => true,
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),
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'font' => array(
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'color' => true,
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'face' => true,
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'size' => true,
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),
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'footer' => array(
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'align' => true,
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'dir' => true,
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'lang' => true,
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'xml:lang' => true,
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),
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'form' => array(
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'action' => true,
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'accept' => true,
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'accept-charset' => true,
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'enctype' => true,
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'method' => true,
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'name' => true,
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'target' => true,
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),
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'h1' => array(
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'align' => true,
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),
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'h2' => array(
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'align' => true,
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),
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'h3' => array(
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'align' => true,
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),
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'h4' => array(
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'align' => true,
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),
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'h5' => array(
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'align' => true,
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),
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'h6' => array(
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'align' => true,
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),
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'header' => array(
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'align' => true,
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'dir' => true,
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'lang' => true,
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'xml:lang' => true,
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),
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'hgroup' => array(
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'align' => true,
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'dir' => true,
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'lang' => true,
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'xml:lang' => true,
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),
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'hr' => array(
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'align' => true,
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'noshade' => true,
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'size' => true,
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'width' => true,
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),
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'i' => array(),
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'img' => array(
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'alt' => true,
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'align' => true,
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'border' => true,
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'height' => true,
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'hspace' => true,
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'longdesc' => true,
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'vspace' => true,
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'src' => true,
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'usemap' => true,
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'width' => true,
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),
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'ins' => array(
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'datetime' => true,
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'cite' => true,
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),
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'kbd' => array(),
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'label' => array(
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'for' => true,
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),
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'legend' => array(
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'align' => true,
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),
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'li' => array(
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'align' => true,
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'value' => true,
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),
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'map' => array(
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'name' => true,
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),
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'mark' => array(),
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'menu' => array(
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'type' => true,
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),
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'nav' => array(
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'align' => true,
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'dir' => true,
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'lang' => true,
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'xml:lang' => true,
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),
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'p' => array(
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'align' => true,
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'dir' => true,
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'lang' => true,
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'xml:lang' => true,
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),
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'pre' => array(
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'width' => true,
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),
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'q' => array(
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'cite' => true,
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),
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's' => array(),
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'samp' => array(),
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'span' => array(
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'dir' => true,
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'align' => true,
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'lang' => true,
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'xml:lang' => true,
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),
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'section' => array(
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'align' => true,
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'dir' => true,
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'lang' => true,
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'xml:lang' => true,
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),
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'small' => array(),
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'strike' => array(),
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'strong' => array(),
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'sub' => array(),
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'summary' => array(
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'align' => true,
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'dir' => true,
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'lang' => true,
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'xml:lang' => true,
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),
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'sup' => array(),
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'table' => array(
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'align' => true,
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'bgcolor' => true,
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'border' => true,
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'cellpadding' => true,
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'cellspacing' => true,
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'dir' => true,
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'rules' => true,
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'summary' => true,
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'width' => true,
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),
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'tbody' => array(
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'align' => true,
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'char' => true,
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'charoff' => true,
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'valign' => true,
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),
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'td' => array(
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'abbr' => true,
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'align' => true,
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'axis' => true,
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'bgcolor' => true,
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'char' => true,
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'charoff' => true,
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'colspan' => true,
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'dir' => true,
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'headers' => true,
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'height' => true,
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'nowrap' => true,
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'rowspan' => true,
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'scope' => true,
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'valign' => true,
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'width' => true,
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),
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'textarea' => array(
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'cols' => true,
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'rows' => true,
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'disabled' => true,
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'name' => true,
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'readonly' => true,
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),
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'tfoot' => array(
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'align' => true,
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'char' => true,
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'charoff' => true,
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'valign' => true,
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),
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'th' => array(
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'abbr' => true,
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'align' => true,
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'axis' => true,
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'bgcolor' => true,
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'char' => true,
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'charoff' => true,
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'colspan' => true,
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'headers' => true,
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'height' => true,
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'nowrap' => true,
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'rowspan' => true,
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'scope' => true,
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'valign' => true,
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'width' => true,
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),
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'thead' => array(
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'align' => true,
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'char' => true,
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'charoff' => true,
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'valign' => true,
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),
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'title' => array(),
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'tr' => array(
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'align' => true,
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'bgcolor' => true,
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'char' => true,
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'charoff' => true,
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'valign' => true,
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),
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'track' => array(
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'default' => true,
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'kind' => true,
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'label' => true,
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'src' => true,
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'srclang' => true,
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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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'type' => true,
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),
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'ol' => array(
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'start' => true,
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'type' => true,
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'reversed' => true,
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),
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'var' => array(),
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'video' => array(
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'autoplay' => true,
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'controls' => true,
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'height' => true,
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|
'loop' => true,
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'muted' => true,
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'poster' => true,
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'preload' => true,
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'src' => true,
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'width' => true,
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),
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);
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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' => true,
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'title' => true,
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),
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'abbr' => array(
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'title' => true,
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),
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'acronym' => array(
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'title' => true,
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),
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'b' => array(),
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'blockquote' => array(
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'cite' => true,
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),
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'cite' => array(),
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'code' => array(),
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'del' => array(
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'datetime' => true,
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),
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'em' => array(),
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'i' => array(),
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'q' => array(
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'cite' => true,
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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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);
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$allowedentitynames = array(
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'nbsp', 'iexcl', 'cent', 'pound', 'curren', 'yen',
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'brvbar', 'sect', 'uml', 'copy', 'ordf', 'laquo',
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'not', 'shy', 'reg', 'macr', 'deg', 'plusmn',
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'acute', 'micro', 'para', 'middot', 'cedil', 'ordm',
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'raquo', 'iquest', 'Agrave', 'Aacute', 'Acirc', 'Atilde',
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'Auml', 'Aring', 'AElig', 'Ccedil', 'Egrave', 'Eacute',
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'Ecirc', 'Euml', 'Igrave', 'Iacute', 'Icirc', 'Iuml',
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'ETH', 'Ntilde', 'Ograve', 'Oacute', 'Ocirc', 'Otilde',
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'Ouml', 'times', 'Oslash', 'Ugrave', 'Uacute', 'Ucirc',
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'Uuml', 'Yacute', 'THORN', 'szlig', 'agrave', 'aacute',
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'acirc', 'atilde', 'auml', 'aring', 'aelig', 'ccedil',
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'egrave', 'eacute', 'ecirc', 'euml', 'igrave', 'iacute',
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'icirc', 'iuml', 'eth', 'ntilde', 'ograve', 'oacute',
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'ocirc', 'otilde', 'ouml', 'divide', 'oslash', 'ugrave',
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|
'uacute', 'ucirc', 'uuml', 'yacute', 'thorn', 'yuml',
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'quot', 'amp', 'lt', 'gt', 'apos', 'OElig',
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'oelig', 'Scaron', 'scaron', 'Yuml', 'circ', 'tilde',
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'ensp', 'emsp', 'thinsp', 'zwnj', 'zwj', 'lrm',
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'rlm', 'ndash', 'mdash', 'lsquo', 'rsquo', 'sbquo',
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'ldquo', 'rdquo', 'bdquo', 'dagger', 'Dagger', 'permil',
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|
'lsaquo', 'rsaquo', 'euro', 'fnof', 'Alpha', 'Beta',
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'Gamma', 'Delta', 'Epsilon', 'Zeta', 'Eta', 'Theta',
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'Iota', 'Kappa', 'Lambda', 'Mu', 'Nu', 'Xi',
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'Omicron', 'Pi', 'Rho', 'Sigma', 'Tau', 'Upsilon',
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|
'Phi', 'Chi', 'Psi', 'Omega', 'alpha', 'beta',
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|
'gamma', 'delta', 'epsilon', 'zeta', 'eta', 'theta',
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|
'iota', 'kappa', 'lambda', 'mu', 'nu', 'xi',
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|
'omicron', 'pi', 'rho', 'sigmaf', 'sigma', 'tau',
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|
'upsilon', 'phi', 'chi', 'psi', 'omega', 'thetasym',
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|
'upsih', 'piv', 'bull', 'hellip', 'prime', 'Prime',
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|
'oline', 'frasl', 'weierp', 'image', 'real', 'trade',
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|
'alefsym', 'larr', 'uarr', 'rarr', 'darr', 'harr',
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|
'crarr', 'lArr', 'uArr', 'rArr', 'dArr', 'hArr',
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|
'forall', 'part', 'exist', 'empty', 'nabla', 'isin',
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'notin', 'ni', 'prod', 'sum', 'minus', 'lowast',
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'radic', 'prop', 'infin', 'ang', 'and', 'or',
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'cap', 'cup', 'int', 'sim', 'cong', 'asymp',
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'ne', 'equiv', 'le', 'ge', 'sub', 'sup',
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'nsub', 'sube', 'supe', 'oplus', 'otimes', 'perp',
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'sdot', 'lceil', 'rceil', 'lfloor', 'rfloor', 'lang',
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'rang', 'loz', 'spades', 'clubs', 'hearts', 'diams',
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'sup1', 'sup2', 'sup3', 'frac14', 'frac12', 'frac34',
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'there4',
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);
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$allowedposttags = array_map( '_wp_add_global_attributes', $allowedposttags );
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} else {
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$allowedtags = wp_kses_array_lc( $allowedtags );
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$allowedposttags = wp_kses_array_lc( $allowedposttags );
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}
|
|
|
|
/**
|
|
* Filters content and keeps only allowable HTML elements.
|
|
*
|
|
* This function makes sure that only the allowed HTML element names, attribute
|
|
* names and attribute values plus only sane HTML entities will occur in
|
|
* $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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* The default allowed protocols are 'http', 'https', 'ftp', 'mailto', 'news',
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* 'irc', 'gopher', 'nntp', 'feed', 'telnet, 'mms', 'rtsp' and 'svn'. This
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* covers all common link protocols, except for 'javascript' which should not
|
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* be allowed for untrusted users.
|
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*
|
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* @since 1.0.0
|
|
*
|
|
* @param string $string Content to filter through kses
|
|
* @param array $allowed_html List of allowed HTML elements
|
|
* @param array $allowed_protocols Optional. Allowed protocol in links.
|
|
* @return string Filtered content with only allowed HTML elements
|
|
*/
|
|
function wp_kses( $string, $allowed_html, $allowed_protocols = array() ) {
|
|
if ( empty( $allowed_protocols ) )
|
|
$allowed_protocols = wp_allowed_protocols();
|
|
$string = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) );
|
|
$string = wp_kses_normalize_entities($string);
|
|
$string = wp_kses_hook($string, $allowed_html, $allowed_protocols); // WP changed the order of these funcs and added args to wp_kses_hook
|
|
return wp_kses_split($string, $allowed_html, $allowed_protocols);
|
|
}
|
|
|
|
/**
|
|
* Filters one attribute only and ensures its value is allowed.
|
|
*
|
|
* This function has the advantage of being more secure than esc_attr() and can
|
|
* escape data in some situations where wp_kses() must strip the whole attribute.
|
|
*
|
|
* @since 4.2.3
|
|
*
|
|
* @param string $string The 'whole' attribute, including name and value.
|
|
* @param string $element The element name to which the attribute belongs.
|
|
* @return string Filtered attribute.
|
|
*/
|
|
function wp_kses_one_attr( $string, $element ) {
|
|
$uris = array('xmlns', 'profile', 'href', 'src', 'cite', 'classid', 'codebase', 'data', 'usemap', 'longdesc', 'action');
|
|
$allowed_html = wp_kses_allowed_html( 'post' );
|
|
$allowed_protocols = wp_allowed_protocols();
|
|
$string = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) );
|
|
|
|
// Preserve leading and trailing whitespace.
|
|
$matches = array();
|
|
preg_match('/^\s*/', $string, $matches);
|
|
$lead = $matches[0];
|
|
preg_match('/\s*$/', $string, $matches);
|
|
$trail = $matches[0];
|
|
if ( empty( $trail ) ) {
|
|
$string = substr( $string, strlen( $lead ) );
|
|
} else {
|
|
$string = substr( $string, strlen( $lead ), -strlen( $trail ) );
|
|
}
|
|
|
|
// Parse attribute name and value from input.
|
|
$split = preg_split( '/\s*=\s*/', $string, 2 );
|
|
$name = $split[0];
|
|
if ( count( $split ) == 2 ) {
|
|
$value = $split[1];
|
|
|
|
// Remove quotes surrounding $value.
|
|
// Also guarantee correct quoting in $string for this one attribute.
|
|
if ( '' == $value ) {
|
|
$quote = '';
|
|
} else {
|
|
$quote = $value[0];
|
|
}
|
|
if ( '"' == $quote || "'" == $quote ) {
|
|
if ( substr( $value, -1 ) != $quote ) {
|
|
return '';
|
|
}
|
|
$value = substr( $value, 1, -1 );
|
|
} else {
|
|
$quote = '"';
|
|
}
|
|
|
|
// Sanitize quotes, angle braces, and entities.
|
|
$value = esc_attr( $value );
|
|
|
|
// Sanitize URI values.
|
|
if ( in_array( strtolower( $name ), $uris ) ) {
|
|
$value = wp_kses_bad_protocol( $value, $allowed_protocols );
|
|
}
|
|
|
|
$string = "$name=$quote$value$quote";
|
|
$vless = 'n';
|
|
} else {
|
|
$value = '';
|
|
$vless = 'y';
|
|
}
|
|
|
|
// Sanitize attribute by name.
|
|
wp_kses_attr_check( $name, $value, $string, $vless, $element, $allowed_html );
|
|
|
|
// Restore whitespace.
|
|
return $lead . $string . $trail;
|
|
}
|
|
|
|
/**
|
|
* Return a list of allowed tags and attributes for a given context.
|
|
*
|
|
* @since 3.5.0
|
|
*
|
|
* @global array $allowedposttags
|
|
* @global array $allowedtags
|
|
* @global array $allowedentitynames
|
|
*
|
|
* @param string|array $context The context for which to retrieve tags.
|
|
* Allowed values are post, strip, data, entities, or
|
|
* the name of a field filter such as pre_user_description.
|
|
* @return array List of allowed tags and their allowed attributes.
|
|
*/
|
|
function wp_kses_allowed_html( $context = '' ) {
|
|
global $allowedposttags, $allowedtags, $allowedentitynames;
|
|
|
|
if ( is_array( $context ) ) {
|
|
/**
|
|
* Filters HTML elements allowed for a given context.
|
|
*
|
|
* @since 3.5.0
|
|
*
|
|
* @param array $context Context to judge allowed tags by.
|
|
* @param string $context_type Context type (explicit).
|
|
*/
|
|
return apply_filters( 'wp_kses_allowed_html', $context, 'explicit' );
|
|
}
|
|
|
|
switch ( $context ) {
|
|
case 'post':
|
|
/** This filter is documented in wp-includes/kses.php */
|
|
return apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context );
|
|
|
|
case 'user_description':
|
|
case 'pre_user_description':
|
|
$tags = $allowedtags;
|
|
$tags['a']['rel'] = true;
|
|
/** This filter is documented in wp-includes/kses.php */
|
|
return apply_filters( 'wp_kses_allowed_html', $tags, $context );
|
|
|
|
case 'strip':
|
|
/** This filter is documented in wp-includes/kses.php */
|
|
return apply_filters( 'wp_kses_allowed_html', array(), $context );
|
|
|
|
case 'entities':
|
|
/** This filter is documented in wp-includes/kses.php */
|
|
return apply_filters( 'wp_kses_allowed_html', $allowedentitynames, $context);
|
|
|
|
case 'data':
|
|
default:
|
|
/** This filter is documented in wp-includes/kses.php */
|
|
return apply_filters( 'wp_kses_allowed_html', $allowedtags, $context );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* You add any kses hooks here.
|
|
*
|
|
* There is currently only one kses WordPress hook, {@see 'pre_kses'}, and it is called here.
|
|
* All parameters are passed to the hooks and expected to receive a string.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $string Content to filter through kses
|
|
* @param array $allowed_html List of allowed HTML elements
|
|
* @param array $allowed_protocols Allowed protocol in links
|
|
* @return string Filtered content through {@see 'pre_kses'} hook.
|
|
*/
|
|
function wp_kses_hook( $string, $allowed_html, $allowed_protocols ) {
|
|
/**
|
|
* Filters content to be run through kses.
|
|
*
|
|
* @since 2.3.0
|
|
*
|
|
* @param string $string Content to run through kses.
|
|
* @param array $allowed_html Allowed HTML elements.
|
|
* @param array $allowed_protocols Allowed protocol in links.
|
|
*/
|
|
return apply_filters( 'pre_kses', $string, $allowed_html, $allowed_protocols );
|
|
}
|
|
|
|
/**
|
|
* This function returns kses' version number.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @return string KSES Version Number
|
|
*/
|
|
function wp_kses_version() {
|
|
return '0.2.2';
|
|
}
|
|
|
|
/**
|
|
* Searches for HTML tags, no matter how malformed.
|
|
*
|
|
* It also matches stray ">" characters.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @global array $pass_allowed_html
|
|
* @global array $pass_allowed_protocols
|
|
*
|
|
* @param string $string Content to filter
|
|
* @param array $allowed_html Allowed HTML elements
|
|
* @param array $allowed_protocols Allowed protocols to keep
|
|
* @return string Content with fixed HTML tags
|
|
*/
|
|
function wp_kses_split( $string, $allowed_html, $allowed_protocols ) {
|
|
global $pass_allowed_html, $pass_allowed_protocols;
|
|
$pass_allowed_html = $allowed_html;
|
|
$pass_allowed_protocols = $allowed_protocols;
|
|
return preg_replace_callback( '%(<!--.*?(-->|$))|(<[^>]*(>|$)|>)%', '_wp_kses_split_callback', $string );
|
|
}
|
|
|
|
/**
|
|
* Callback for wp_kses_split.
|
|
*
|
|
* @since 3.1.0
|
|
* @access private
|
|
*
|
|
* @global array $pass_allowed_html
|
|
* @global array $pass_allowed_protocols
|
|
*
|
|
* @return string
|
|
*/
|
|
function _wp_kses_split_callback( $match ) {
|
|
global $pass_allowed_html, $pass_allowed_protocols;
|
|
return wp_kses_split2( $match[0], $pass_allowed_html, $pass_allowed_protocols );
|
|
}
|
|
|
|
/**
|
|
* Callback for wp_kses_split for fixing malformed HTML tags.
|
|
*
|
|
* This function does a lot of work. It rejects some very malformed things like
|
|
* <:::>. It returns an empty string, if the element isn't allowed (look ma, no
|
|
* strip_tags()!). Otherwise it splits the tag into an element and an attribute
|
|
* list.
|
|
*
|
|
* After the tag is split into an element and an attribute list, it is run
|
|
* through another filter which will remove illegal attributes and once that is
|
|
* completed, will be returned.
|
|
*
|
|
* @access private
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $string Content to filter
|
|
* @param array $allowed_html Allowed HTML elements
|
|
* @param array $allowed_protocols Allowed protocols to keep
|
|
* @return string Fixed HTML element
|
|
*/
|
|
function wp_kses_split2($string, $allowed_html, $allowed_protocols) {
|
|
$string = wp_kses_stripslashes($string);
|
|
|
|
if (substr($string, 0, 1) != '<')
|
|
return '>';
|
|
// It matched a ">" character
|
|
|
|
if ( '<!--' == substr( $string, 0, 4 ) ) {
|
|
$string = str_replace( array('<!--', '-->'), '', $string );
|
|
while ( $string != ($newstring = wp_kses($string, $allowed_html, $allowed_protocols)) )
|
|
$string = $newstring;
|
|
if ( $string == '' )
|
|
return '';
|
|
// prevent multiple dashes in comments
|
|
$string = preg_replace('/--+/', '-', $string);
|
|
// prevent three dashes closing a comment
|
|
$string = preg_replace('/-$/', '', $string);
|
|
return "<!--{$string}-->";
|
|
}
|
|
// Allow HTML comments
|
|
|
|
if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9-]+)([^>]*)>?$%', $string, $matches))
|
|
return '';
|
|
// It's seriously malformed
|
|
|
|
$slash = trim($matches[1]);
|
|
$elem = $matches[2];
|
|
$attrlist = $matches[3];
|
|
|
|
if ( ! is_array( $allowed_html ) )
|
|
$allowed_html = wp_kses_allowed_html( $allowed_html );
|
|
|
|
if ( ! isset($allowed_html[strtolower($elem)]) )
|
|
return '';
|
|
// They are using a not allowed HTML element
|
|
|
|
if ($slash != '')
|
|
return "</$elem>";
|
|
// No attributes are allowed for closing elements
|
|
|
|
return wp_kses_attr( $elem, $attrlist, $allowed_html, $allowed_protocols );
|
|
}
|
|
|
|
/**
|
|
* Removes all attributes, if none are allowed for this element.
|
|
*
|
|
* If some are allowed it calls wp_kses_hair() to split them further, and then
|
|
* it builds up new HTML code from the data that kses_hair() returns. It also
|
|
* removes "<" and ">" characters, if there are any left. One more thing it does
|
|
* is to check if the tag has a closing XHTML slash, and if it does, it puts one
|
|
* in the returned code as well.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $element HTML element/tag
|
|
* @param string $attr HTML attributes from HTML element to closing HTML element tag
|
|
* @param array $allowed_html Allowed HTML elements
|
|
* @param array $allowed_protocols Allowed protocols to keep
|
|
* @return string Sanitized HTML element
|
|
*/
|
|
function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) {
|
|
if ( ! is_array( $allowed_html ) )
|
|
$allowed_html = wp_kses_allowed_html( $allowed_html );
|
|
|
|
// Is there a closing XHTML slash at the end of the attributes?
|
|
$xhtml_slash = '';
|
|
if (preg_match('%\s*/\s*$%', $attr))
|
|
$xhtml_slash = ' /';
|
|
|
|
// Are any attributes allowed at all for this element?
|
|
$element_low = strtolower( $element );
|
|
if ( empty( $allowed_html[ $element_low ] ) || true === $allowed_html[ $element_low ] ) {
|
|
return "<$element$xhtml_slash>";
|
|
}
|
|
|
|
// Split it
|
|
$attrarr = wp_kses_hair($attr, $allowed_protocols);
|
|
|
|
// Go through $attrarr, and save the allowed attributes for this element
|
|
// in $attr2
|
|
$attr2 = '';
|
|
foreach ( $attrarr as $arreach ) {
|
|
if ( wp_kses_attr_check( $arreach['name'], $arreach['value'], $arreach['whole'], $arreach['vless'], $element, $allowed_html ) ) {
|
|
$attr2 .= ' '.$arreach['whole'];
|
|
}
|
|
}
|
|
|
|
// Remove any "<" or ">" characters
|
|
$attr2 = preg_replace('/[<>]/', '', $attr2);
|
|
|
|
return "<$element$attr2$xhtml_slash>";
|
|
}
|
|
|
|
/**
|
|
* Determine whether an attribute is allowed.
|
|
*
|
|
* @since 4.2.3
|
|
* @since 5.0.0 Add support for `data-*` wildcard attributes.
|
|
*
|
|
* @param string $name The attribute name. Returns empty string when not allowed.
|
|
* @param string $value The attribute value. Returns a filtered value.
|
|
* @param string $whole The name=value input. Returns filtered input.
|
|
* @param string $vless 'y' when attribute like "enabled", otherwise 'n'.
|
|
* @param string $element The name of the element to which this attribute belongs.
|
|
* @param array $allowed_html The full list of allowed elements and attributes.
|
|
* @return bool Is the attribute allowed?
|
|
*/
|
|
function wp_kses_attr_check( &$name, &$value, &$whole, $vless, $element, $allowed_html ) {
|
|
$allowed_attr = $allowed_html[ strtolower( $element ) ];
|
|
|
|
$name_low = strtolower( $name );
|
|
|
|
if ( ! isset( $allowed_attr[$name_low] ) || '' == $allowed_attr[$name_low] ) {
|
|
/*
|
|
* Allow `data-*` attributes.
|
|
*
|
|
* When specifying `$allowed_html`, the attribute name should be set as
|
|
* `data-*` (not to be mixed with the HTML 4.0 `data` attribute, see
|
|
* https://www.w3.org/TR/html40/struct/objects.html#adef-data).
|
|
*
|
|
* Note: the attribute name should only contain `A-Za-z0-9_-` chars,
|
|
* double hyphens `--` are not accepted by WordPress.
|
|
*/
|
|
if ( strpos( $name_low, 'data-' ) === 0 && ! empty( $allowed_attr['data-*'] ) && preg_match( '/^data(?:-[a-z0-9_]+)+$/', $name_low, $match ) ) {
|
|
/*
|
|
* Add the whole attribute name to the allowed attributes and set any restrictions
|
|
* for the `data-*` attribute values for the current element.
|
|
*/
|
|
$allowed_attr[ $match[0] ] = $allowed_attr['data-*'];
|
|
} else {
|
|
$name = $value = $whole = '';
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if ( 'style' == $name_low ) {
|
|
$new_value = safecss_filter_attr( $value );
|
|
|
|
if ( empty( $new_value ) ) {
|
|
$name = $value = $whole = '';
|
|
return false;
|
|
}
|
|
|
|
$whole = str_replace( $value, $new_value, $whole );
|
|
$value = $new_value;
|
|
}
|
|
|
|
if ( is_array( $allowed_attr[ $name_low ] ) ) {
|
|
// there are some checks
|
|
foreach ( $allowed_attr[$name_low] as $currkey => $currval ) {
|
|
if ( ! wp_kses_check_attr_val( $value, $vless, $currkey, $currval ) ) {
|
|
$name = $value = $whole = '';
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* 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 = $match[1];
|
|
if ( in_array(strtolower($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 = $match[1];
|
|
if ( in_array(strtolower($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 = $match[1];
|
|
if ( in_array(strtolower($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;
|
|
}
|
|
|
|
/**
|
|
* Finds all attributes of an HTML element.
|
|
*
|
|
* Does not modify input. May return "evil" output.
|
|
*
|
|
* Based on wp_kses_split2() and wp_kses_attr()
|
|
*
|
|
* @since 4.2.3
|
|
*
|
|
* @param string $element HTML element/tag
|
|
* @return array|bool List of attributes found in $element. Returns false on failure.
|
|
*/
|
|
function wp_kses_attr_parse( $element ) {
|
|
$valid = preg_match('%^(<\s*)(/\s*)?([a-zA-Z0-9]+\s*)([^>]*)(>?)$%', $element, $matches);
|
|
if ( 1 !== $valid ) {
|
|
return false;
|
|
}
|
|
|
|
$begin = $matches[1];
|
|
$slash = $matches[2];
|
|
$elname = $matches[3];
|
|
$attr = $matches[4];
|
|
$end = $matches[5];
|
|
|
|
if ( '' !== $slash ) {
|
|
// Closing elements do not get parsed.
|
|
return false;
|
|
}
|
|
|
|
// Is there a closing XHTML slash at the end of the attributes?
|
|
if ( 1 === preg_match( '%\s*/\s*$%', $attr, $matches ) ) {
|
|
$xhtml_slash = $matches[0];
|
|
$attr = substr( $attr, 0, -strlen( $xhtml_slash ) );
|
|
} else {
|
|
$xhtml_slash = '';
|
|
}
|
|
|
|
// Split it
|
|
$attrarr = wp_kses_hair_parse( $attr );
|
|
if ( false === $attrarr ) {
|
|
return false;
|
|
}
|
|
|
|
// Make sure all input is returned by adding front and back matter.
|
|
array_unshift( $attrarr, $begin . $slash . $elname );
|
|
array_push( $attrarr, $xhtml_slash . $end );
|
|
|
|
return $attrarr;
|
|
}
|
|
|
|
/**
|
|
* Builds an attribute list from string containing attributes.
|
|
*
|
|
* Does not modify input. May return "evil" output.
|
|
* In case of unexpected input, returns false instead of stripping things.
|
|
*
|
|
* Based on wp_kses_hair() but does not return a multi-dimensional array.
|
|
*
|
|
* @since 4.2.3
|
|
*
|
|
* @param string $attr Attribute list from HTML element to closing HTML element tag
|
|
* @return array|bool List of attributes found in $attr. Returns false on failure.
|
|
*/
|
|
function wp_kses_hair_parse( $attr ) {
|
|
if ( '' === $attr ) {
|
|
return array();
|
|
}
|
|
|
|
$regex =
|
|
'(?:'
|
|
. '[-a-zA-Z:]+' // Attribute name.
|
|
. '|'
|
|
. '\[\[?[^\[\]]+\]\]?' // Shortcode in the name position implies unfiltered_html.
|
|
. ')'
|
|
. '(?:' // Attribute value.
|
|
. '\s*=\s*' // All values begin with '='
|
|
. '(?:'
|
|
. '"[^"]*"' // Double-quoted
|
|
. '|'
|
|
. "'[^']*'" // Single-quoted
|
|
. '|'
|
|
. '[^\s"\']+' // Non-quoted
|
|
. '(?:\s|$)' // Must have a space
|
|
. ')'
|
|
. '|'
|
|
. '(?:\s|$)' // If attribute has no value, space is required.
|
|
. ')'
|
|
. '\s*'; // Trailing space is optional except as mentioned above.
|
|
|
|
// Although it is possible to reduce this procedure to a single regexp,
|
|
// we must run that regexp twice to get exactly the expected result.
|
|
|
|
$validation = "%^($regex)+$%";
|
|
$extraction = "%$regex%";
|
|
|
|
if ( 1 === preg_match( $validation, $attr ) ) {
|
|
preg_match_all( $extraction, $attr, $attrarr );
|
|
return $attrarr[0];
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Performs different checks for attribute values.
|
|
*
|
|
* The currently implemented checks are "maxlen", "minlen", "maxval", "minval"
|
|
* and "valueless".
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $value Attribute value
|
|
* @param string $vless Whether the value is valueless. Use 'y' or 'n'
|
|
* @param string $checkname What $checkvalue is checking for.
|
|
* @param mixed $checkvalue What constraint the value should pass
|
|
* @return bool Whether check passes
|
|
*/
|
|
function wp_kses_check_attr_val($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)
|
|
$ok = false;
|
|
break;
|
|
|
|
case 'minval' :
|
|
// The minval check makes sure that the attribute value is a positive integer,
|
|
// and that it is not smaller than the given value.
|
|
|
|
if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))
|
|
$ok = false;
|
|
if ($value < $checkvalue)
|
|
$ok = false;
|
|
break;
|
|
|
|
case 'valueless' :
|
|
// The valueless check makes sure if the attribute has a value
|
|
// (like <a href="blah">) or not (<option selected>). If the given value
|
|
// is a "y" or a "Y", the attribute must not have a value.
|
|
// If the given value is an "n" or an "N", the attribute must have one.
|
|
|
|
if (strtolower($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);
|
|
$iterations = 0;
|
|
|
|
do {
|
|
$original_string = $string;
|
|
$string = wp_kses_bad_protocol_once($string, $allowed_protocols);
|
|
} while ( $original_string != $string && ++$iterations < 6 );
|
|
|
|
if ( $original_string != $string )
|
|
return '';
|
|
|
|
return $string;
|
|
}
|
|
|
|
/**
|
|
* Removes any invalid control characters in $string.
|
|
*
|
|
* Also removes any instance of the '\0' string.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $string
|
|
* @param array $options Set 'slash_zero' => 'keep' when '\0' is allowed. Default is 'remove'.
|
|
* @return string
|
|
*/
|
|
function wp_kses_no_null( $string, $options = null ) {
|
|
if ( ! isset( $options['slash_zero'] ) ) {
|
|
$options = array( 'slash_zero' => 'remove' );
|
|
}
|
|
|
|
$string = preg_replace( '/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '', $string );
|
|
if ( 'remove' == $options['slash_zero'] ) {
|
|
$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 $string String to strip slashes
|
|
* @return string Fixed string with quoted slashes
|
|
*/
|
|
function wp_kses_stripslashes($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;
|
|
}
|
|
|
|
/**
|
|
* 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, $count = 1 ) {
|
|
$string2 = preg_split( '/:|�*58;|�*3a;/i', $string, 2 );
|
|
if ( isset($string2[1]) && ! preg_match('%/\?%', $string2[0]) ) {
|
|
$string = trim( $string2[1] );
|
|
$protocol = wp_kses_bad_protocol_once2( $string2[0], $allowed_protocols );
|
|
if ( 'feed:' == $protocol ) {
|
|
if ( $count > 2 )
|
|
return '';
|
|
$string = wp_kses_bad_protocol_once( $string, $allowed_protocols, ++$count );
|
|
if ( empty( $string ) )
|
|
return $string;
|
|
}
|
|
$string = $protocol . $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
|
|
* whitelist or not, and returns different data depending on the answer.
|
|
*
|
|
* @access private
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $string URI scheme to check against the whitelist
|
|
* @param string $allowed_protocols Allowed protocols
|
|
* @return string Sanitized content
|
|
*/
|
|
function wp_kses_bad_protocol_once2( $string, $allowed_protocols ) {
|
|
$string2 = wp_kses_decode_entities($string);
|
|
$string2 = preg_replace('/\s/', '', $string2);
|
|
$string2 = wp_kses_no_null($string2);
|
|
$string2 = strtolower($string2);
|
|
|
|
$allowed = false;
|
|
foreach ( (array) $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_callback('/&([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_named_entities', $string);
|
|
$string = preg_replace_callback('/&#(0*[0-9]{1,7});/', 'wp_kses_normalize_entities2', $string);
|
|
$string = preg_replace_callback('/&#[Xx](0*[0-9A-Fa-f]{1,6});/', 'wp_kses_normalize_entities3', $string);
|
|
|
|
return $string;
|
|
}
|
|
|
|
/**
|
|
* Callback for wp_kses_normalize_entities() regular expression.
|
|
*
|
|
* This function only accepts valid named entity references, which are finite,
|
|
* case-sensitive, and highly scrutinized by HTML and XML validators.
|
|
*
|
|
* @since 3.0.0
|
|
*
|
|
* @global array $allowedentitynames
|
|
*
|
|
* @param array $matches preg_replace_callback() matches array
|
|
* @return string Correctly encoded entity
|
|
*/
|
|
function wp_kses_named_entities($matches) {
|
|
global $allowedentitynames;
|
|
|
|
if ( empty($matches[1]) )
|
|
return '';
|
|
|
|
$i = $matches[1];
|
|
return ( ! in_array( $i, $allowedentitynames ) ) ? "&$i;" : "&$i;";
|
|
}
|
|
|
|
/**
|
|
* 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 ( empty($matches[1]) )
|
|
return '';
|
|
|
|
$i = $matches[1];
|
|
if (valid_unicode($i)) {
|
|
$i = str_pad(ltrim($i,'0'), 3, '0', STR_PAD_LEFT);
|
|
$i = "&#$i;";
|
|
} else {
|
|
$i = "&#$i;";
|
|
}
|
|
|
|
return $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.
|
|
*
|
|
* @since 2.7.0
|
|
* @access private
|
|
*
|
|
* @param array $matches preg_replace_callback() matches array
|
|
* @return string Correctly encoded entity
|
|
*/
|
|
function wp_kses_normalize_entities3($matches) {
|
|
if ( empty($matches[1]) )
|
|
return '';
|
|
|
|
$hexchars = $matches[1];
|
|
return ( ! valid_unicode( hexdec( $hexchars ) ) ) ? "&#x$hexchars;" : '&#x'.ltrim($hexchars,'0').';';
|
|
}
|
|
|
|
/**
|
|
* Helper function to determine if a Unicode value is valid.
|
|
*
|
|
* @since 2.7.0
|
|
*
|
|
* @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]+);/', '_wp_kses_decode_entities_chr', $string);
|
|
$string = preg_replace_callback('/&#[Xx]([0-9A-Fa-f]+);/', '_wp_kses_decode_entities_chr_hexdec', $string);
|
|
|
|
return $string;
|
|
}
|
|
|
|
/**
|
|
* Regex callback for wp_kses_decode_entities()
|
|
*
|
|
* @since 2.9.0
|
|
*
|
|
* @param array $match preg match
|
|
* @return string
|
|
*/
|
|
function _wp_kses_decode_entities_chr( $match ) {
|
|
return chr( $match[1] );
|
|
}
|
|
|
|
/**
|
|
* Regex callback for wp_kses_decode_entities()
|
|
*
|
|
* @since 2.9.0
|
|
*
|
|
* @param array $match preg match
|
|
* @return string
|
|
*/
|
|
function _wp_kses_decode_entities_chr_hexdec( $match ) {
|
|
return chr( hexdec( $match[1] ) );
|
|
}
|
|
|
|
/**
|
|
* Sanitize content with allowed HTML Kses rules.
|
|
*
|
|
* @since 1.0.0
|
|
*
|
|
* @param string $data Content to filter, expected to be escaped with slashes
|
|
* @return string Filtered content
|
|
*/
|
|
function wp_filter_kses( $data ) {
|
|
return addslashes( wp_kses( stripslashes( $data ), current_filter() ) );
|
|
}
|
|
|
|
/**
|
|
* Sanitize content with allowed HTML Kses rules.
|
|
*
|
|
* @since 2.9.0
|
|
*
|
|
* @param string $data Content to filter, expected to not be escaped
|
|
* @return string Filtered content
|
|
*/
|
|
function wp_kses_data( $data ) {
|
|
return wp_kses( $data, current_filter() );
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*
|
|
* @param string $data Post content to filter, expected to be escaped with slashes
|
|
* @return string Filtered post content with allowed HTML tags and attributes intact.
|
|
*/
|
|
function wp_filter_post_kses( $data ) {
|
|
return addslashes( wp_kses( stripslashes( $data ), 'post' ) );
|
|
}
|
|
|
|
/**
|
|
* 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 2.9.0
|
|
*
|
|
* @param string $data Post content to filter
|
|
* @return string Filtered post content with allowed HTML tags and attributes intact.
|
|
*/
|
|
function wp_kses_post( $data ) {
|
|
return wp_kses( $data, 'post' );
|
|
}
|
|
|
|
/**
|
|
* Navigates through an array, object, or scalar, and sanitizes content for
|
|
* allowed HTML tags for post content.
|
|
*
|
|
* @since 4.4.2
|
|
*
|
|
* @see map_deep()
|
|
*
|
|
* @param mixed $data The array, object, or scalar value to inspect.
|
|
* @return mixed The filtered content.
|
|
*/
|
|
function wp_kses_post_deep( $data ) {
|
|
return map_deep( $data, 'wp_kses_post' );
|
|
}
|
|
|
|
/**
|
|
* Strips all of the HTML in the content.
|
|
*
|
|
* @since 2.1.0
|
|
*
|
|
* @param string $data Content to strip all HTML from
|
|
* @return string Filtered content without any HTML
|
|
*/
|
|
function wp_filter_nohtml_kses( $data ) {
|
|
return addslashes( wp_kses( stripslashes( $data ), 'strip' ) );
|
|
}
|
|
|
|
/**
|
|
* Adds all Kses input form content filters.
|
|
*
|
|
* All hooks have default priority. The wp_filter_kses() function is added to
|
|
* the 'pre_comment_content' and 'title_save_pre' hooks.
|
|
*
|
|
* The wp_filter_post_kses() function is added to the 'content_save_pre',
|
|
* 'excerpt_save_pre', and 'content_filtered_save_pre' hooks.
|
|
*
|
|
* @since 2.0.0
|
|
*/
|
|
function kses_init_filters() {
|
|
// Normal filtering
|
|
add_filter('title_save_pre', 'wp_filter_kses');
|
|
|
|
// Comment filtering
|
|
if ( current_user_can( 'unfiltered_html' ) )
|
|
add_filter( 'pre_comment_content', 'wp_filter_post_kses' );
|
|
else
|
|
add_filter( 'pre_comment_content', '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');
|
|
}
|
|
|
|
/**
|
|
* Removes all Kses input form content filters.
|
|
*
|
|
* A quick procedural method to removing all of the filters that kses uses for
|
|
* content in WordPress Loop.
|
|
*
|
|
* Does not remove the kses_init() function from {@see 'init'} hook (priority is
|
|
* default). Also does not remove kses_init() function from {@see 'set_current_user'}
|
|
* hook (priority is also default).
|
|
*
|
|
* @since 2.0.6
|
|
*/
|
|
function kses_remove_filters() {
|
|
// Normal filtering
|
|
remove_filter('title_save_pre', 'wp_filter_kses');
|
|
|
|
// Comment filtering
|
|
remove_filter( 'pre_comment_content', 'wp_filter_post_kses' );
|
|
remove_filter( 'pre_comment_content', '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');
|
|
}
|
|
|
|
/**
|
|
* Sets up most of the Kses filters for input form content.
|
|
*
|
|
* If you remove the kses_init() function from {@see 'init'} hook and
|
|
* {@see 'set_current_user'} (priority is default), then none of the Kses filter hooks
|
|
* will be added.
|
|
*
|
|
* First removes all of the Kses filters in case the current user does not need
|
|
* to have Kses filter the content. If the user does not have unfiltered_html
|
|
* capability, then Kses filters are added.
|
|
*
|
|
* @since 2.0.0
|
|
*/
|
|
function kses_init() {
|
|
kses_remove_filters();
|
|
|
|
if ( ! current_user_can( 'unfiltered_html' ) ) {
|
|
kses_init_filters();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Inline CSS filter
|
|
*
|
|
* @since 2.8.1
|
|
*
|
|
* @param string $css A string of CSS rules.
|
|
* @param string $deprecated Not used.
|
|
* @return string Filtered string of CSS rules.
|
|
*/
|
|
function safecss_filter_attr( $css, $deprecated = '' ) {
|
|
if ( ! empty( $deprecated ) ) {
|
|
_deprecated_argument( __FUNCTION__, '2.8.1' ); // Never implemented
|
|
}
|
|
|
|
$css = wp_kses_no_null( $css );
|
|
$css = str_replace( array( "\n", "\r", "\t" ), '', $css );
|
|
|
|
$allowed_protocols = wp_allowed_protocols();
|
|
|
|
$css_array = explode( ';', trim( $css ) );
|
|
|
|
/**
|
|
* Filters list of allowed CSS attributes.
|
|
*
|
|
* @since 2.8.1
|
|
* @since 4.4.0 Added support for `min-height`, `max-height`, `min-width`, and `max-width`.
|
|
* @since 4.6.0 Added support for `list-style-type`.
|
|
* @since 5.0.0 Added support for `background-image`.
|
|
*
|
|
* @param array $attr List of allowed CSS attributes.
|
|
*/
|
|
$allowed_attr = apply_filters( 'safe_style_css', array(
|
|
'background',
|
|
'background-color',
|
|
'background-image',
|
|
|
|
'border',
|
|
'border-width',
|
|
'border-color',
|
|
'border-style',
|
|
'border-right',
|
|
'border-right-color',
|
|
'border-right-style',
|
|
'border-right-width',
|
|
'border-bottom',
|
|
'border-bottom-color',
|
|
'border-bottom-style',
|
|
'border-bottom-width',
|
|
'border-left',
|
|
'border-left-color',
|
|
'border-left-style',
|
|
'border-left-width',
|
|
'border-top',
|
|
'border-top-color',
|
|
'border-top-style',
|
|
'border-top-width',
|
|
|
|
'border-spacing',
|
|
'border-collapse',
|
|
'caption-side',
|
|
|
|
'color',
|
|
'font',
|
|
'font-family',
|
|
'font-size',
|
|
'font-style',
|
|
'font-variant',
|
|
'font-weight',
|
|
'letter-spacing',
|
|
'line-height',
|
|
'text-decoration',
|
|
'text-indent',
|
|
'text-align',
|
|
|
|
'height',
|
|
'min-height',
|
|
'max-height',
|
|
|
|
'width',
|
|
'min-width',
|
|
'max-width',
|
|
|
|
'margin',
|
|
'margin-right',
|
|
'margin-bottom',
|
|
'margin-left',
|
|
'margin-top',
|
|
|
|
'padding',
|
|
'padding-right',
|
|
'padding-bottom',
|
|
'padding-left',
|
|
'padding-top',
|
|
|
|
'clear',
|
|
'cursor',
|
|
'direction',
|
|
'float',
|
|
'overflow',
|
|
'vertical-align',
|
|
'list-style-type',
|
|
) );
|
|
|
|
|
|
/*
|
|
* CSS attributes that accept URL data types.
|
|
*
|
|
* This is in accordance to the CSS spec and unrelated to
|
|
* the sub-set of supported attributes above.
|
|
*
|
|
* See: https://developer.mozilla.org/en-US/docs/Web/CSS/url
|
|
*/
|
|
$css_url_data_types = array(
|
|
'background',
|
|
'background-image',
|
|
|
|
'cursor',
|
|
|
|
'list-style',
|
|
'list-style-image',
|
|
);
|
|
|
|
if ( empty( $allowed_attr ) ) {
|
|
return $css;
|
|
}
|
|
|
|
$css = '';
|
|
foreach ( $css_array as $css_item ) {
|
|
if ( $css_item == '' ) {
|
|
continue;
|
|
}
|
|
|
|
$css_item = trim( $css_item );
|
|
$css_test_string = $css_item;
|
|
$found = false;
|
|
$url_attr = false;
|
|
|
|
if ( strpos( $css_item, ':' ) === false ) {
|
|
$found = true;
|
|
} else {
|
|
$parts = explode( ':', $css_item, 2 );
|
|
$css_selector = trim( $parts[0] );
|
|
|
|
if ( in_array( $css_selector, $allowed_attr, true ) ) {
|
|
$found = true;
|
|
$url_attr = in_array( $css_selector, $css_url_data_types, true );
|
|
}
|
|
}
|
|
|
|
if ( $found && $url_attr ) {
|
|
// Simplified: matches the sequence `url(*)`.
|
|
preg_match_all( '/url\([^)]+\)/', $parts[1], $url_matches );
|
|
|
|
foreach ( $url_matches[0] as $url_match ) {
|
|
// Clean up the URL from each of the matches above.
|
|
preg_match( '/^url\(\s*([\'\"]?)(.*)(\g1)\s*\)$/', $url_match, $url_pieces );
|
|
|
|
if ( empty( $url_pieces[2] ) ) {
|
|
$found = false;
|
|
break;
|
|
}
|
|
|
|
$url = trim( $url_pieces[2] );
|
|
|
|
if ( empty( $url ) || $url !== wp_kses_bad_protocol( $url, $allowed_protocols ) ) {
|
|
$found = false;
|
|
break;
|
|
} else {
|
|
// Remove the whole `url(*)` bit that was matched above from the CSS.
|
|
$css_test_string = str_replace( $url_match, '', $css_test_string );
|
|
}
|
|
}
|
|
}
|
|
|
|
// Remove any CSS containing containing \ ( & } = or comments, except for url() useage checked above.
|
|
if ( $found && ! preg_match( '%[\\\(&=}]|/\*%', $css_test_string ) ) {
|
|
if ( $css != '' ) {
|
|
$css .= ';';
|
|
}
|
|
|
|
$css .= $css_item;
|
|
}
|
|
}
|
|
|
|
return $css;
|
|
}
|
|
|
|
/**
|
|
* Helper function to add global attributes to a tag in the allowed html list.
|
|
*
|
|
* @since 3.5.0
|
|
* @since 5.0.0 Add support for `data-*` wildcard attributes.
|
|
* @access private
|
|
*
|
|
* @param array $value An array of attributes.
|
|
* @return array The array of attributes with global attributes added.
|
|
*/
|
|
function _wp_add_global_attributes( $value ) {
|
|
$global_attributes = array(
|
|
'aria-describedby' => true,
|
|
'aria-details' => true,
|
|
'aria-label' => true,
|
|
'aria-labelledby' => true,
|
|
'aria-hidden' => true,
|
|
'class' => true,
|
|
'id' => true,
|
|
'style' => true,
|
|
'title' => true,
|
|
'role' => true,
|
|
'data-*' => true,
|
|
);
|
|
|
|
if ( true === $value )
|
|
$value = array();
|
|
|
|
if ( is_array( $value ) )
|
|
return array_merge( $value, $global_attributes );
|
|
|
|
return $value;
|
|
}
|