mirror of
https://github.com/WordPress/WordPress.git
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aaf99e6913
WordPress' code just... wasn't. This is now dealt with. Props jrf, pento, netweb, GaryJ, jdgrimes, westonruter, Greg Sherwood from PHPCS, and everyone who's ever contributed to WPCS and PHPCS. Fixes #41057. Built from https://develop.svn.wordpress.org/trunk@42343 git-svn-id: http://core.svn.wordpress.org/trunk@42172 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2100 lines
51 KiB
PHP
2100 lines
51 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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* 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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}
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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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),
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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',
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'iexcl',
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'cent',
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'pound',
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'curren',
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'yen',
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'brvbar',
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'sect',
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'uml',
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'copy',
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'ordf',
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'laquo',
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'not',
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'shy',
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'reg',
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'macr',
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'deg',
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'plusmn',
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'acute',
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'micro',
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'para',
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'middot',
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'cedil',
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'ordm',
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'raquo',
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'iquest',
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'Agrave',
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'Aacute',
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'Acirc',
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'Atilde',
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'Auml',
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'Aring',
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'AElig',
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'Ccedil',
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'Egrave',
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'Eacute',
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'Ecirc',
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'Euml',
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'Igrave',
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'Iacute',
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'Icirc',
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'Iuml',
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'ETH',
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'Ntilde',
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'Ograve',
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'Oacute',
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'Ocirc',
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'Otilde',
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'Ouml',
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'times',
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'Oslash',
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'Ugrave',
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'Uacute',
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'Ucirc',
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'Uuml',
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'Yacute',
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'THORN',
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'szlig',
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'agrave',
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'aacute',
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'acirc',
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'atilde',
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'auml',
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'aring',
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'aelig',
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'ccedil',
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'egrave',
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'eacute',
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'ecirc',
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'euml',
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'igrave',
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'iacute',
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'icirc',
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'iuml',
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'eth',
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'ntilde',
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'ograve',
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'oacute',
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'ocirc',
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'otilde',
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'ouml',
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'divide',
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'oslash',
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'ugrave',
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'uacute',
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'ucirc',
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'uuml',
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'yacute',
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'thorn',
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'yuml',
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'quot',
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'amp',
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'lt',
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'gt',
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'apos',
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'OElig',
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'oelig',
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'Scaron',
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'scaron',
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'Yuml',
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'circ',
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'tilde',
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'ensp',
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'emsp',
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'thinsp',
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'zwnj',
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'zwj',
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'lrm',
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'rlm',
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'ndash',
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'mdash',
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'lsquo',
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'rsquo',
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'sbquo',
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'ldquo',
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'rdquo',
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'bdquo',
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'dagger',
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'Dagger',
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'permil',
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'lsaquo',
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'rsaquo',
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'euro',
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'fnof',
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'Alpha',
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'Beta',
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'Gamma',
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'Delta',
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'Epsilon',
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'Zeta',
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'Eta',
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'Theta',
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'Iota',
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'Kappa',
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'Lambda',
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'Mu',
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'Nu',
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'Xi',
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'Omicron',
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'Pi',
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'Rho',
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'Sigma',
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'Tau',
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'Upsilon',
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|
'Phi',
|
|
'Chi',
|
|
'Psi',
|
|
'Omega',
|
|
'alpha',
|
|
'beta',
|
|
'gamma',
|
|
'delta',
|
|
'epsilon',
|
|
'zeta',
|
|
'eta',
|
|
'theta',
|
|
'iota',
|
|
'kappa',
|
|
'lambda',
|
|
'mu',
|
|
'nu',
|
|
'xi',
|
|
'omicron',
|
|
'pi',
|
|
'rho',
|
|
'sigmaf',
|
|
'sigma',
|
|
'tau',
|
|
'upsilon',
|
|
'phi',
|
|
'chi',
|
|
'psi',
|
|
'omega',
|
|
'thetasym',
|
|
'upsih',
|
|
'piv',
|
|
'bull',
|
|
'hellip',
|
|
'prime',
|
|
'Prime',
|
|
'oline',
|
|
'frasl',
|
|
'weierp',
|
|
'image',
|
|
'real',
|
|
'trade',
|
|
'alefsym',
|
|
'larr',
|
|
'uarr',
|
|
'rarr',
|
|
'darr',
|
|
'harr',
|
|
'crarr',
|
|
'lArr',
|
|
'uArr',
|
|
'rArr',
|
|
'dArr',
|
|
'hArr',
|
|
'forall',
|
|
'part',
|
|
'exist',
|
|
'empty',
|
|
'nabla',
|
|
'isin',
|
|
'notin',
|
|
'ni',
|
|
'prod',
|
|
'sum',
|
|
'minus',
|
|
'lowast',
|
|
'radic',
|
|
'prop',
|
|
'infin',
|
|
'ang',
|
|
'and',
|
|
'or',
|
|
'cap',
|
|
'cup',
|
|
'int',
|
|
'sim',
|
|
'cong',
|
|
'asymp',
|
|
'ne',
|
|
'equiv',
|
|
'le',
|
|
'ge',
|
|
'sub',
|
|
'sup',
|
|
'nsub',
|
|
'sube',
|
|
'supe',
|
|
'oplus',
|
|
'otimes',
|
|
'perp',
|
|
'sdot',
|
|
'lceil',
|
|
'rceil',
|
|
'lfloor',
|
|
'rfloor',
|
|
'lang',
|
|
'rang',
|
|
'loz',
|
|
'spades',
|
|
'clubs',
|
|
'hearts',
|
|
'diams',
|
|
'sup1',
|
|
'sup2',
|
|
'sup3',
|
|
'frac14',
|
|
'frac12',
|
|
'frac34',
|
|
'there4',
|
|
);
|
|
|
|
$allowedposttags = array_map( '_wp_add_global_attributes', $allowedposttags );
|
|
} else {
|
|
$allowedtags = wp_kses_array_lc( $allowedtags );
|
|
$allowedposttags = wp_kses_array_lc( $allowedposttags );
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* call this function.
|
|
*
|
|
* The default allowed protocols are 'http', 'https', 'ftp', 'mailto', 'news',
|
|
* 'irc', 'gopher', 'nntp', 'feed', 'telnet, 'mms', 'rtsp' and 'svn'. This
|
|
* covers all common link protocols, except for 'javascript' which should not
|
|
* be allowed for untrusted users.
|
|
*
|
|
* @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?
|
|
if ( ! isset( $allowed_html[ strtolower( $element ) ] ) || true === $allowed_html[ strtolower( $element ) ] || count( $allowed_html[ strtolower( $element ) ] ) == 0 ) {
|
|
return "<$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
|
|
*
|
|
* @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 ] ) {
|
|
$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:
|
|
if ( preg_match( '/^([-a-zA-Z:]+)/', $attr, $match ) ) {
|
|
$attrname = $match[1];
|
|
$working = $mode = 1;
|
|
$attr = preg_replace( '/^[-a-zA-Z:]+/', '', $attr );
|
|
}
|
|
|
|
break;
|
|
|
|
case 1:
|
|
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+/', '', $attr );
|
|
}
|
|
|
|
break;
|
|
|
|
case 2:
|
|
if ( preg_match( '%^"([^"]*)"(\s+|/?$)%', $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();
|
|
}
|
|
|
|
// phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
|
|
$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.
|
|
// phpcs:enable
|
|
|
|
// 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 );
|
|
|
|
if ( preg_match( '%[\\\\(&=}]|/\*%', $css ) ) { // remove any inline css containing \ ( & } = or comments
|
|
return '';
|
|
}
|
|
|
|
$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`.
|
|
*
|
|
* @param array $attr List of allowed CSS attributes.
|
|
*/
|
|
$allowed_attr = apply_filters(
|
|
'safe_style_css', array(
|
|
'background',
|
|
'background-color',
|
|
|
|
'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',
|
|
)
|
|
);
|
|
|
|
if ( empty( $allowed_attr ) ) {
|
|
return $css;
|
|
}
|
|
|
|
$css = '';
|
|
foreach ( $css_array as $css_item ) {
|
|
if ( $css_item == '' ) {
|
|
continue;
|
|
}
|
|
$css_item = trim( $css_item );
|
|
$found = false;
|
|
if ( strpos( $css_item, ':' ) === false ) {
|
|
$found = true;
|
|
} else {
|
|
$parts = explode( ':', $css_item );
|
|
if ( in_array( trim( $parts[0] ), $allowed_attr ) ) {
|
|
$found = true;
|
|
}
|
|
}
|
|
if ( $found ) {
|
|
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
|
|
* @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(
|
|
'class' => true,
|
|
'id' => true,
|
|
'style' => true,
|
|
'title' => true,
|
|
'role' => true,
|
|
);
|
|
|
|
if ( true === $value ) {
|
|
$value = array();
|
|
}
|
|
|
|
if ( is_array( $value ) ) {
|
|
return array_merge( $value, $global_attributes );
|
|
}
|
|
|
|
return $value;
|
|
}
|