2101 lines
51 KiB
PHP
2101 lines
51 KiB
PHP
<?php
|
|
/**
|
|
* kses 0.2.2 - HTML/XHTML filter that only allows some elements and attributes
|
|
* Copyright (C) 2002, 2003, 2005 Ulf Harnhammar
|
|
*
|
|
* This program is free software and open source software; you can redistribute
|
|
* it and/or modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of the License,
|
|
* or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
|
|
* http://www.gnu.org/licenses/gpl.html
|
|
*
|
|
* [kses strips evil scripts!]
|
|
*
|
|
* Added wp_ prefix to avoid conflicts with existing kses users
|
|
*
|
|
* @version 0.2.2
|
|
* @copyright (C) 2002, 2003, 2005
|
|
* @author Ulf Harnhammar <http://advogato.org/person/metaur/>
|
|
*
|
|
* @package External
|
|
* @subpackage KSES
|
|
*/
|
|
|
|
/**
|
|
* You can override this in a plugin.
|
|
*
|
|
* The {@see 'wp_kses_allowed_html'} filter is more powerful and supplies context.
|
|
*
|
|
* `CUSTOM_TAGS` is not recommended and should be considered deprecated.
|
|
*
|
|
* @see wp_kses_allowed_html()
|
|
*
|
|
* @since 1.2.0
|
|
*/
|
|
if ( ! defined( 'CUSTOM_TAGS' ) ) {
|
|
define( 'CUSTOM_TAGS', false );
|
|
}
|
|
|
|
// Ensure that these variables are added to the global namespace
|
|
// (e.g. if using namespaces / autoload in the current PHP environment).
|
|
global $allowedposttags, $allowedtags, $allowedentitynames;
|
|
|
|
if ( ! CUSTOM_TAGS ) {
|
|
/**
|
|
* Kses global for default allowable HTML tags.
|
|
*
|
|
* Can be override by using CUSTOM_TAGS constant.
|
|
*
|
|
* @global array $allowedposttags
|
|
* @since 2.0.0
|
|
*/
|
|
$allowedposttags = array(
|
|
'address' => array(),
|
|
'a' => array(
|
|
'href' => true,
|
|
'rel' => true,
|
|
'rev' => true,
|
|
'name' => true,
|
|
'target' => true,
|
|
),
|
|
'abbr' => array(),
|
|
'acronym' => array(),
|
|
'area' => array(
|
|
'alt' => true,
|
|
'coords' => true,
|
|
'href' => true,
|
|
'nohref' => true,
|
|
'shape' => true,
|
|
'target' => true,
|
|
),
|
|
'article' => array(
|
|
'align' => true,
|
|
'dir' => true,
|
|
'lang' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'aside' => array(
|
|
'align' => true,
|
|
'dir' => true,
|
|
'lang' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'audio' => array(
|
|
'autoplay' => true,
|
|
'controls' => true,
|
|
'loop' => true,
|
|
'muted' => true,
|
|
'preload' => true,
|
|
'src' => true,
|
|
),
|
|
'b' => array(),
|
|
'bdo' => array(
|
|
'dir' => true,
|
|
),
|
|
'big' => array(),
|
|
'blockquote' => array(
|
|
'cite' => true,
|
|
'lang' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'br' => array(),
|
|
'button' => array(
|
|
'disabled' => true,
|
|
'name' => true,
|
|
'type' => true,
|
|
'value' => true,
|
|
),
|
|
'caption' => array(
|
|
'align' => true,
|
|
),
|
|
'cite' => array(
|
|
'dir' => true,
|
|
'lang' => true,
|
|
),
|
|
'code' => array(),
|
|
'col' => array(
|
|
'align' => true,
|
|
'char' => true,
|
|
'charoff' => true,
|
|
'span' => true,
|
|
'dir' => true,
|
|
'valign' => true,
|
|
'width' => true,
|
|
),
|
|
'colgroup' => array(
|
|
'align' => true,
|
|
'char' => true,
|
|
'charoff' => true,
|
|
'span' => true,
|
|
'valign' => true,
|
|
'width' => true,
|
|
),
|
|
'del' => array(
|
|
'datetime' => true,
|
|
),
|
|
'dd' => array(),
|
|
'dfn' => array(),
|
|
'details' => array(
|
|
'align' => true,
|
|
'dir' => true,
|
|
'lang' => true,
|
|
'open' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'div' => array(
|
|
'align' => true,
|
|
'dir' => true,
|
|
'lang' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'dl' => array(),
|
|
'dt' => array(),
|
|
'em' => array(),
|
|
'fieldset' => array(),
|
|
'figure' => array(
|
|
'align' => true,
|
|
'dir' => true,
|
|
'lang' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'figcaption' => array(
|
|
'align' => true,
|
|
'dir' => true,
|
|
'lang' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'font' => array(
|
|
'color' => true,
|
|
'face' => true,
|
|
'size' => true,
|
|
),
|
|
'footer' => array(
|
|
'align' => true,
|
|
'dir' => true,
|
|
'lang' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'form' => array(
|
|
'action' => true,
|
|
'accept' => true,
|
|
'accept-charset' => true,
|
|
'enctype' => true,
|
|
'method' => true,
|
|
'name' => true,
|
|
'target' => true,
|
|
),
|
|
'h1' => array(
|
|
'align' => true,
|
|
),
|
|
'h2' => array(
|
|
'align' => true,
|
|
),
|
|
'h3' => array(
|
|
'align' => true,
|
|
),
|
|
'h4' => array(
|
|
'align' => true,
|
|
),
|
|
'h5' => array(
|
|
'align' => true,
|
|
),
|
|
'h6' => array(
|
|
'align' => true,
|
|
),
|
|
'header' => array(
|
|
'align' => true,
|
|
'dir' => true,
|
|
'lang' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'hgroup' => array(
|
|
'align' => true,
|
|
'dir' => true,
|
|
'lang' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'hr' => array(
|
|
'align' => true,
|
|
'noshade' => true,
|
|
'size' => true,
|
|
'width' => true,
|
|
),
|
|
'i' => array(),
|
|
'img' => array(
|
|
'alt' => true,
|
|
'align' => true,
|
|
'border' => true,
|
|
'height' => true,
|
|
'hspace' => true,
|
|
'longdesc' => true,
|
|
'vspace' => true,
|
|
'src' => true,
|
|
'usemap' => true,
|
|
'width' => true,
|
|
),
|
|
'ins' => array(
|
|
'datetime' => true,
|
|
'cite' => true,
|
|
),
|
|
'kbd' => array(),
|
|
'label' => array(
|
|
'for' => true,
|
|
),
|
|
'legend' => array(
|
|
'align' => true,
|
|
),
|
|
'li' => array(
|
|
'align' => true,
|
|
'value' => true,
|
|
),
|
|
'map' => array(
|
|
'name' => true,
|
|
),
|
|
'mark' => array(),
|
|
'menu' => array(
|
|
'type' => true,
|
|
),
|
|
'nav' => array(
|
|
'align' => true,
|
|
'dir' => true,
|
|
'lang' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'p' => array(
|
|
'align' => true,
|
|
'dir' => true,
|
|
'lang' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'pre' => array(
|
|
'width' => true,
|
|
),
|
|
'q' => array(
|
|
'cite' => true,
|
|
),
|
|
's' => array(),
|
|
'samp' => array(),
|
|
'span' => array(
|
|
'dir' => true,
|
|
'align' => true,
|
|
'lang' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'section' => array(
|
|
'align' => true,
|
|
'dir' => true,
|
|
'lang' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'small' => array(),
|
|
'strike' => array(),
|
|
'strong' => array(),
|
|
'sub' => array(),
|
|
'summary' => array(
|
|
'align' => true,
|
|
'dir' => true,
|
|
'lang' => true,
|
|
'xml:lang' => true,
|
|
),
|
|
'sup' => array(),
|
|
'table' => array(
|
|
'align' => true,
|
|
'bgcolor' => true,
|
|
'border' => true,
|
|
'cellpadding' => true,
|
|
'cellspacing' => true,
|
|
'dir' => true,
|
|
'rules' => true,
|
|
'summary' => true,
|
|
'width' => true,
|
|
),
|
|
'tbody' => array(
|
|
'align' => true,
|
|
'char' => true,
|
|
'charoff' => true,
|
|
'valign' => true,
|
|
),
|
|
'td' => array(
|
|
'abbr' => true,
|
|
'align' => true,
|
|
'axis' => true,
|
|
'bgcolor' => true,
|
|
'char' => true,
|
|
'charoff' => true,
|
|
'colspan' => true,
|
|
'dir' => true,
|
|
'headers' => true,
|
|
'height' => true,
|
|
'nowrap' => true,
|
|
'rowspan' => true,
|
|
'scope' => true,
|
|
'valign' => true,
|
|
'width' => true,
|
|
),
|
|
'textarea' => array(
|
|
'cols' => true,
|
|
'rows' => true,
|
|
'disabled' => true,
|
|
'name' => true,
|
|
'readonly' => true,
|
|
),
|
|
'tfoot' => array(
|
|
'align' => true,
|
|
'char' => true,
|
|
'charoff' => true,
|
|
'valign' => true,
|
|
),
|
|
'th' => array(
|
|
'abbr' => true,
|
|
'align' => true,
|
|
'axis' => true,
|
|
'bgcolor' => true,
|
|
'char' => true,
|
|
'charoff' => true,
|
|
'colspan' => true,
|
|
'headers' => true,
|
|
'height' => true,
|
|
'nowrap' => true,
|
|
'rowspan' => true,
|
|
'scope' => true,
|
|
'valign' => true,
|
|
'width' => true,
|
|
),
|
|
'thead' => array(
|
|
'align' => true,
|
|
'char' => true,
|
|
'charoff' => true,
|
|
'valign' => true,
|
|
),
|
|
'title' => array(),
|
|
'tr' => array(
|
|
'align' => true,
|
|
'bgcolor' => true,
|
|
'char' => true,
|
|
'charoff' => true,
|
|
'valign' => true,
|
|
),
|
|
'track' => array(
|
|
'default' => true,
|
|
'kind' => true,
|
|
'label' => true,
|
|
'src' => true,
|
|
'srclang' => true,
|
|
),
|
|
'tt' => array(),
|
|
'u' => array(),
|
|
'ul' => array(
|
|
'type' => true,
|
|
),
|
|
'ol' => array(
|
|
'start' => true,
|
|
'type' => true,
|
|
'reversed' => true,
|
|
),
|
|
'var' => array(),
|
|
'video' => array(
|
|
'autoplay' => true,
|
|
'controls' => true,
|
|
'height' => true,
|
|
'loop' => true,
|
|
'muted' => true,
|
|
'poster' => true,
|
|
'preload' => true,
|
|
'src' => true,
|
|
'width' => true,
|
|
),
|
|
);
|
|
|
|
/**
|
|
* Kses allowed HTML elements.
|
|
*
|
|
* @global array $allowedtags
|
|
* @since 1.0.0
|
|
*/
|
|
$allowedtags = array(
|
|
'a' => array(
|
|
'href' => true,
|
|
'title' => true,
|
|
),
|
|
'abbr' => array(
|
|
'title' => true,
|
|
),
|
|
'acronym' => array(
|
|
'title' => true,
|
|
),
|
|
'b' => array(),
|
|
'blockquote' => array(
|
|
'cite' => true,
|
|
),
|
|
'cite' => array(),
|
|
'code' => array(),
|
|
'del' => array(
|
|
'datetime' => true,
|
|
),
|
|
'em' => array(),
|
|
'i' => array(),
|
|
'q' => array(
|
|
'cite' => true,
|
|
),
|
|
's' => array(),
|
|
'strike' => array(),
|
|
'strong' => array(),
|
|
);
|
|
|
|
$allowedentitynames = array(
|
|
'nbsp',
|
|
'iexcl',
|
|
'cent',
|
|
'pound',
|
|
'curren',
|
|
'yen',
|
|
'brvbar',
|
|
'sect',
|
|
'uml',
|
|
'copy',
|
|
'ordf',
|
|
'laquo',
|
|
'not',
|
|
'shy',
|
|
'reg',
|
|
'macr',
|
|
'deg',
|
|
'plusmn',
|
|
'acute',
|
|
'micro',
|
|
'para',
|
|
'middot',
|
|
'cedil',
|
|
'ordm',
|
|
'raquo',
|
|
'iquest',
|
|
'Agrave',
|
|
'Aacute',
|
|
'Acirc',
|
|
'Atilde',
|
|
'Auml',
|
|
'Aring',
|
|
'AElig',
|
|
'Ccedil',
|
|
'Egrave',
|
|
'Eacute',
|
|
'Ecirc',
|
|
'Euml',
|
|
'Igrave',
|
|
'Iacute',
|
|
'Icirc',
|
|
'Iuml',
|
|
'ETH',
|
|
'Ntilde',
|
|
'Ograve',
|
|
'Oacute',
|
|
'Ocirc',
|
|
'Otilde',
|
|
'Ouml',
|
|
'times',
|
|
'Oslash',
|
|
'Ugrave',
|
|
'Uacute',
|
|
'Ucirc',
|
|
'Uuml',
|
|
'Yacute',
|
|
'THORN',
|
|
'szlig',
|
|
'agrave',
|
|
'aacute',
|
|
'acirc',
|
|
'atilde',
|
|
'auml',
|
|
'aring',
|
|
'aelig',
|
|
'ccedil',
|
|
'egrave',
|
|
'eacute',
|
|
'ecirc',
|
|
'euml',
|
|
'igrave',
|
|
'iacute',
|
|
'icirc',
|
|
'iuml',
|
|
'eth',
|
|
'ntilde',
|
|
'ograve',
|
|
'oacute',
|
|
'ocirc',
|
|
'otilde',
|
|
'ouml',
|
|
'divide',
|
|
'oslash',
|
|
'ugrave',
|
|
'uacute',
|
|
'ucirc',
|
|
'uuml',
|
|
'yacute',
|
|
'thorn',
|
|
'yuml',
|
|
'quot',
|
|
'amp',
|
|
'lt',
|
|
'gt',
|
|
'apos',
|
|
'OElig',
|
|
'oelig',
|
|
'Scaron',
|
|
'scaron',
|
|
'Yuml',
|
|
'circ',
|
|
'tilde',
|
|
'ensp',
|
|
'emsp',
|
|
'thinsp',
|
|
'zwnj',
|
|
'zwj',
|
|
'lrm',
|
|
'rlm',
|
|
'ndash',
|
|
'mdash',
|
|
'lsquo',
|
|
'rsquo',
|
|
'sbquo',
|
|
'ldquo',
|
|
'rdquo',
|
|
'bdquo',
|
|
'dagger',
|
|
'Dagger',
|
|
'permil',
|
|
'lsaquo',
|
|
'rsaquo',
|
|
'euro',
|
|
'fnof',
|
|
'Alpha',
|
|
'Beta',
|
|
'Gamma',
|
|
'Delta',
|
|
'Epsilon',
|
|
'Zeta',
|
|
'Eta',
|
|
'Theta',
|
|
'Iota',
|
|
'Kappa',
|
|
'Lambda',
|
|
'Mu',
|
|
'Nu',
|
|
'Xi',
|
|
'Omicron',
|
|
'Pi',
|
|
'Rho',
|
|
'Sigma',
|
|
'Tau',
|
|
'Upsilon',
|
|
'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 );
|
|
|
|
// It matched a ">" character.
|
|
if ( substr( $string, 0, 1 ) != '<' ) {
|
|
return '>';
|
|
}
|
|
|
|
// Allow HTML comments.
|
|
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}-->";
|
|
}
|
|
|
|
// It's seriously malformed.
|
|
if ( ! preg_match( '%^<\s*(/\s*)?([a-zA-Z0-9-]+)([^>]*)>?$%', $string, $matches ) ) {
|
|
return '';
|
|
}
|
|
|
|
$slash = trim( $matches[1] );
|
|
$elem = $matches[2];
|
|
$attrlist = $matches[3];
|
|
|
|
if ( ! is_array( $allowed_html ) ) {
|
|
$allowed_html = wp_kses_allowed_html( $allowed_html );
|
|
}
|
|
|
|
// They are using a not allowed HTML element.
|
|
if ( ! isset( $allowed_html[ strtolower( $elem ) ] ) ) {
|
|
return '';
|
|
}
|
|
|
|
// No attributes are allowed for closing elements.
|
|
if ( $slash != '' ) {
|
|
return "</$elem>";
|
|
}
|
|
|
|
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
|
|
*
|
|
* @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;
|
|
}
|