X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/ff81ee6e8304a1982a3ec4f5b134764a29d502cf..53f4633144ed68c8b8fb5861f992b5489894a940:/wp-includes/kses.php diff --git a/wp-includes/kses.php b/wp-includes/kses.php index a0bdf2c8..578c5ba4 100644 --- a/wp-includes/kses.php +++ b/wp-includes/kses.php @@ -1,225 +1,940 @@ + * + * @package External + * @subpackage KSES + * + */ + +/** + * You can override this in a plugin. + * + * The 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(), + '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, + ), + '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(), + ); -// Added wp_ prefix to avoid conflicts with existing kses users -# kses 0.2.1 - HTML/XHTML filter that only allows some elements and attributes -# Copyright (C) 2002, 2003 Ulf Harnhammar -# *** CONTACT INFORMATION *** -# -# E-mail: metaur at users dot sourceforge dot net -# Web page: http://sourceforge.net/projects/kses -# Paper mail: Ulf Harnhammar -# Ymergatan 17 C -# 753 25 Uppsala -# SWEDEN -# -# [kses strips evil scripts!] -if (!defined('CUSTOM_TAGS')) - define('CUSTOM_TAGS', false); - -// You can override this in your my-hacks.php file -if (!CUSTOM_TAGS) { - $allowedposttags = array ('address' => array (), 'a' => array ('href' => array (), 'title' => array (), 'rel' => array (), 'rev' => array (), 'name' => array ()), 'abbr' => array ('title' => array ()), 'acronym' => array ('title' => array ()), 'b' => array (), 'big' => array (), 'blockquote' => array ('cite' => array ()), 'br' => array (), 'button' => array ('disabled' => array (), 'name' => array (), 'type' => array (), 'value' => array ()), 'caption' => array ('align' => array ()), 'code' => array (), 'col' => array ('align' => array (), 'char' => array (), 'charoff' => array (), 'span' => array (), 'valign' => array (), 'width' => array ()), 'del' => array ('datetime' => array ()), 'dd' => array (), 'div' => array ('align' => array ()), 'dl' => array (), 'dt' => array (), 'em' => array (), 'fieldset' => array (), 'font' => array ('color' => array (), 'face' => array (), 'size' => array ()), 'form' => array ('action' => array (), 'accept' => array (), 'accept-charset' => array (), 'enctype' => array (), 'method' => array (), 'name' => array (), 'target' => array ()), 'h1' => array ('align' => array ()), 'h2' => array ('align' => array ()), 'h3' => array ('align' => array ()), 'h4' => array ('align' => array ()), 'h5' => array ('align' => array ()), 'h6' => array ('align' => array ()), 'hr' => array ('align' => array (), 'noshade' => array (), 'size' => array (), 'width' => array ()), 'i' => array (), 'img' => array ('alt' => array (), 'align' => array (), 'border' => array (), 'height' => array (), 'hspace' => array (), 'longdesc' => array (), 'vspace' => array (), 'src' => array (), 'width' => array ()), 'ins' => array ('datetime' => array (), 'cite' => array ()), 'kbd' => array (), 'label' => array ('for' => array ()), 'legend' => array ('align' => array ()), 'li' => array (), 'p' => array ('align' => array ()), 'pre' => array ('width' => array ()), 'q' => array ('cite' => array ()), 's' => array (), 'strike' => array (), 'strong' => array (), 'sub' => array (), 'sup' => array (), 'table' => array ('align' => array (), 'bgcolor' => array (), 'border' => array (), 'cellpadding' => array (), 'cellspacing' => array (), 'rules' => array (), 'summary' => array (), 'width' => array ()), 'tbody' => array ('align' => array (), 'char' => array (), 'charoff' => array (), 'valign' => array ()), 'td' => array ('abbr' => array (), 'align' => array (), 'axis' => array (), 'bgcolor' => array (), 'char' => array (), 'charoff' => array (), 'colspan' => array (), 'headers' => array (), 'height' => array (), 'nowrap' => array (), 'rowspan' => array (), 'scope' => array (), 'valign' => array (), 'width' => array ()), 'textarea' => array ('cols' => array (), 'rows' => array (), 'disabled' => array (), 'name' => array (), 'readonly' => array ()), 'tfoot' => array ('align' => array (), 'char' => array (), 'charoff' => array (), 'valign' => array ()), 'th' => array ('abbr' => array (), 'align' => array (), 'axis' => array (), 'bgcolor' => array (), 'char' => array (), 'charoff' => array (), 'colspan' => array (), 'headers' => array (), 'height' => array (), 'nowrap' => array (), 'rowspan' => array (), 'scope' => array (), 'valign' => array (), 'width' => array ()), 'thead' => array ('align' => array (), 'char' => array (), 'charoff' => array (), 'valign' => array ()), 'title' => array (), 'tr' => array ('align' => array (), 'bgcolor' => array (), 'char' => array (), 'charoff' => array (), 'valign' => array ()), 'tt' => array (), 'u' => array (), 'ul' => array (), 'ol' => array (), 'var' => array () ); - $allowedtags = array ('a' => array ('href' => array (), 'title' => array ()), 'abbr' => array ('title' => array ()), 'acronym' => array ('title' => array ()), 'b' => array (), 'blockquote' => array ('cite' => array ()), - // 'br' => array(), - 'code' => array (), - // 'del' => array('datetime' => array()), - // 'dd' => array(), - // 'dl' => array(), - // 'dt' => array(), - 'em' => array (), 'i' => array (), - // 'ins' => array('datetime' => array(), 'cite' => array()), - // 'li' => array(), - // 'ol' => array(), - // 'p' => array(), - // 'q' => array(), - 'strike' => array (), 'strong' => array (), - // 'sub' => array(), - // 'sup' => array(), - // 'u' => array(), - // 'ul' => 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( $allowedposttags ); } -function wp_kses($string, $allowed_html, $allowed_protocols = array ('http', 'https', 'ftp', 'news', 'nntp', 'telnet', 'feed', 'gopher', 'mailto')) - ############################################################################### - # 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. - ############################################################################### - { - $string = wp_kses_no_null($string); + +/** + * 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' ) ); $string = wp_kses_js_entities($string); $string = wp_kses_normalize_entities($string); - $string = wp_kses_hook($string); - $allowed_html_fixed = wp_kses_array_lc($allowed_html); - return wp_kses_split($string, $allowed_html_fixed, $allowed_protocols); -} # function wp_kses - -function wp_kses_hook($string) -############################################################################### -# You add any kses hooks here. -############################################################################### -{ - return $string; -} # function wp_kses_hook + $string = wp_kses_hook($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' ) ); + $string = wp_kses_js_entities( $string ); + + // 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 $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 ) ) { + /** + * Filter HTML elements allowed for a given context. + * + * @since 3.5.0 + * + * @param string $tags Allowed tags, attributes, and/or entities. + * @param string $context Context to judge allowed tags by. Allowed values are 'post', + * 'data', 'strip', 'entities', 'explicit', or the name of a filter. + */ + 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 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 'pre_kses' hook + */ +function wp_kses_hook( $string, $allowed_html, $allowed_protocols ) { + /** + * Filter 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, $allowed_protocols ); +} -function wp_kses_version() -############################################################################### -# This function returns kses' version number. -############################################################################### -{ +/** + * This function returns kses' version number. + * + * @since 1.0.0 + * + * @return string KSES Version Number + */ +function wp_kses_version() { return '0.2.2'; -} # function wp_kses_version - -function wp_kses_split($string, $allowed_html, $allowed_protocols) -############################################################################### -# This function searches for HTML tags, no matter how malformed. It also -# matches stray ">" characters. -############################################################################### -{ - return preg_replace('%((|$))|(<[^>]*(>|$)|>))%e', - "wp_kses_split2('\\1', \$allowed_html, ".'$allowed_protocols)', $string); -} # function wp_kses_split - -function wp_kses_split2($string, $allowed_html, $allowed_protocols) -############################################################################### -# 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. -############################################################################### -{ +} + +/** + * 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($string, 0, 1) != '<') return '>'; - # It matched a ">" character + // It matched a ">" character - if (preg_match('%^)?$%', $string, $matches)) { - $string = str_replace(array(''), '', $matches[1]); - while ( $string != $newstring = wp_kses($string, $allowed_html, $allowed_protocols) ) + if ( ''), '', $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 + $string = preg_replace('/-$/', '', $string); return ""; } - # Allow HTML comments + // Allow HTML comments if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $string, $matches)) return ''; - # It's seriously malformed + // It's seriously malformed $slash = trim($matches[1]); $elem = $matches[2]; $attrlist = $matches[3]; - if (!@ is_array($allowed_html[strtolower($elem)])) + if ( ! is_array( $allowed_html ) ) + $allowed_html = wp_kses_allowed_html( $allowed_html ); + + if ( ! isset($allowed_html[strtolower($elem)]) ) return ''; - # They are using a not allowed HTML element + // They are using a not allowed HTML element if ($slash != '') - return "<$slash$elem>"; - # No attributes are allowed for closing elements - - return wp_kses_attr("$slash$elem", $attrlist, $allowed_html, $allowed_protocols); -} # function wp_kses_split2 - -function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) -############################################################################### -# This function 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. -############################################################################### -{ - # Is there a closing XHTML slash at the end of the attributes? + return ""; + // 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? $xhtml_slash = ''; - if (preg_match('%\s/\s*$%', $attr)) + if (preg_match('%\s*/\s*$%', $attr)) $xhtml_slash = ' /'; - # Are any attributes allowed at all for this element? - - if (@ count($allowed_html[strtolower($element)]) == 0) + // Are any attributes allowed at all for this element? + if ( ! isset($allowed_html[strtolower($element)]) || count($allowed_html[strtolower($element)]) == 0 ) return "<$element$xhtml_slash>"; - # Split it - + // Split it $attrarr = wp_kses_hair($attr, $allowed_protocols); - # Go through $attrarr, and save the allowed attributes for this element - # in $attr2 - + // 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']; + } + } - foreach ($attrarr as $arreach) { - if (!@ isset ($allowed_html[strtolower($element)][strtolower($arreach['name'])])) - continue; # the attribute is not allowed + // Remove any "<" or ">" characters + $attr2 = preg_replace('/[<>]/', '', $attr2); - $current = $allowed_html[strtolower($element)][strtolower($arreach['name'])]; - if ($current == '') - continue; # the attribute is not allowed + return "<$element$attr2$xhtml_slash>"; +} - if (!is_array($current)) - $attr2 .= ' '.$arreach['whole']; - # there are no checks - - else { - # there are some checks - $ok = true; - foreach ($current as $currkey => $currval) - if (!wp_kses_check_attr_val($arreach['value'], $arreach['vless'], $currkey, $currval)) { - $ok = false; - break; - } +/** + * 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 = $whole = ''; + return false; + } - if ($ok) - $attr2 .= ' '.$arreach['whole']; # it passed them - } # if !is_array($current) - } # foreach + if ( 'style' == $name_low ) { + $new_value = safecss_filter_attr( $value ); - # Remove any "<" or ">" characters + if ( empty( $new_value ) ) { + $name = $value = $whole = ''; + return false; + } - $attr2 = preg_replace('/[<>]/', '', $attr2); + $whole = str_replace( $value, $new_value, $whole ); + $value = $new_value; + } - return "<$element$attr2$xhtml_slash>"; -} # function wp_kses_attr - -function wp_kses_hair($attr, $allowed_protocols) -############################################################################### -# 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. -############################################################################### -{ - $attrarr = array (); + 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 = ''; + $uris = array('xmlns', 'profile', 'href', 'src', 'cite', 'classid', 'codebase', 'data', 'usemap', 'longdesc', 'action'); - # Loop through the whole attribute list + // Loop through the whole attribute list while (strlen($attr) != 0) { - $working = 0; # Was the last operation successful? + $working = 0; // Was the last operation successful? switch ($mode) { - case 0 : # attribute name, href for instance + case 0 : // attribute name, href for instance - if (preg_match('/^([-a-zA-Z]+)/', $attr, $match)) { + if ( preg_match('/^([-a-zA-Z:]+)/', $attr, $match ) ) { $attrname = $match[1]; $working = $mode = 1; - $attr = preg_replace('/^[-a-zA-Z]+/', '', $attr); + $attr = preg_replace( '/^[-a-zA-Z:]+/', '', $attr ); } break; - case 1 : # equals sign or valueless ("selected") + case 1 : // equals sign or valueless ("selected") - if (preg_match('/^\s*=\s*/', $attr)) # equals sign + if (preg_match('/^\s*=\s*/', $attr)) // equals sign { $working = 1; $mode = 2; @@ -227,105 +942,230 @@ function wp_kses_hair($attr, $allowed_protocols) break; } - if (preg_match('/^\s+/', $attr)) # valueless + if (preg_match('/^\s+/', $attr)) // valueless { $working = 1; $mode = 0; - $attrarr[] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y'); + if(false === array_key_exists($attrname, $attrarr)) { + $attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y'); + } $attr = preg_replace('/^\s+/', '', $attr); } break; - case 2 : # attribute value, a URL after href= for instance + case 2 : // attribute value, a URL after href= for instance - if (preg_match('/^"([^"]*)"(\s+|$)/', $attr, $match)) - # "value" + if (preg_match('%^"([^"]*)"(\s+|/?$)%', $attr, $match)) + // "value" { - $thisval = wp_kses_bad_protocol($match[1], $allowed_protocols); + $thisval = $match[1]; + if ( in_array(strtolower($attrname), $uris) ) + $thisval = wp_kses_bad_protocol($thisval, $allowed_protocols); - $attrarr[] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n'); + if(false === array_key_exists($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, $match)) - # 'value' + if (preg_match("%^'([^']*)'(\s+|/?$)%", $attr, $match)) + // 'value' { - $thisval = wp_kses_bad_protocol($match[1], $allowed_protocols); + $thisval = $match[1]; + if ( in_array(strtolower($attrname), $uris) ) + $thisval = wp_kses_bad_protocol($thisval, $allowed_protocols); - $attrarr[] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname='$thisval'", 'vless' => 'n'); + if(false === array_key_exists($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, $match)) - # value + if (preg_match("%^([^\s\"']+)(\s+|/?$)%", $attr, $match)) + // value { - $thisval = wp_kses_bad_protocol($match[1], $allowed_protocols); - - $attrarr[] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n'); - # We add quotes to conform to W3C's HTML spec. + $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; $attr = preg_replace("%^[^\s\"']+(\s+|$)%", '', $attr); } break; - } # switch + } // switch - if ($working == 0) # not well formed, remove and try again - { + if ($working == 0) // not well formed, remove and try again + { $attr = wp_kses_html_error($attr); $mode = 0; } - } # while + } // while - if ($mode == 1) - # special case, for when the attribute list ends with a valueless - # attribute like "selected" - $attrarr[] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y'); + if ($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 $attrarr; -} # function wp_kses_hair - -function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue) -############################################################################### -# This function performs different checks for attribute values. The currently -# implemented checks are "maxlen", "minlen", "maxval", "minval" and "valueless" -# with even more checks to come soon. -############################################################################### -{ +} + +/** + * Finds all attributes of an HTML element. + * + * Does not modify input. May return "evil" output. + * + * Based on wp_kses_split2() and wp_kses_attr() + * + * @since 4.2.3 + * + * @param string $element HTML element/tag + * @return array|bool List of attributes found in $element. Returns false on failure. + */ +function wp_kses_attr_parse( $element ) { + $valid = preg_match('%^(<\s*)(/\s*)?([a-zA-Z0-9]+\s*)([^>]*)(>?)$%', $element, $matches); + if ( 1 !== $valid ) { + return false; + } + + $begin = $matches[1]; + $slash = $matches[2]; + $elname = $matches[3]; + $attr = $matches[4]; + $end = $matches[5]; + + if ( '' !== $slash ) { + // Closing elements do not get parsed. + return false; + } + + // Is there a closing XHTML slash at the end of the attributes? + if ( 1 === preg_match( '%\s*/\s*$%', $attr, $matches ) ) { + $xhtml_slash = $matches[0]; + $attr = substr( $attr, 0, -strlen( $xhtml_slash ) ); + } else { + $xhtml_slash = ''; + } + + // Split it + $attrarr = wp_kses_hair_parse( $attr ); + if ( false === $attrarr ) { + return false; + } + + // Make sure all input is returned by adding front and back matter. + array_unshift( $attrarr, $begin . $slash . $elname ); + array_push( $attrarr, $xhtml_slash . $end ); + + return $attrarr; +} + +/** + * Builds an attribute list from string containing attributes. + * + * Does not modify input. May return "evil" output. + * In case of unexpected input, returns false instead of stripping things. + * + * Based on wp_kses_hair() but does not return a multi-dimensional array. + * + * @since 4.2.3 + * + * @param string $attr Attribute list from HTML element to closing HTML element tag + * @return array|bool List of attributes found in $attr. Returns false on failure. + */ +function wp_kses_hair_parse( $attr ) { + if ( '' === $attr ) { + return array(); + } + + $regex = + '(?:' + . '[-a-zA-Z:]+' // Attribute name. + . '|' + . '\[\[?[^\[\]]+\]\]?' // Shortcode in the name position implies unfiltered_html. + . ')' + . '(?:' // Attribute value. + . '\s*=\s*' // All values begin with '=' + . '(?:' + . '"[^"]*"' // Double-quoted + . '|' + . "'[^']*'" // Single-quoted + . '|' + . '[^\s"\']+' // Non-quoted + . '(?:\s|$)' // Must have a space + . ')' + . '|' + . '(?:\s|$)' // If attribute has no value, space is required. + . ')' + . '\s*'; // Trailing space is optional except as mentioned above. + + // Although it is possible to reduce this procedure to a single regexp, + // we must run that regexp twice to get exactly the expected result. + + $validation = "%^($regex)+$%"; + $extraction = "%$regex%"; + + if ( 1 === preg_match( $validation, $attr ) ) { + preg_match_all( $extraction, $attr, $attrarr ); + return $attrarr[0]; + } else { + return false; + } +} + +/** + * Performs different checks for attribute values. + * + * The currently implemented checks are "maxlen", "minlen", "maxval", "minval" + * and "valueless". + * + * @since 1.0.0 + * + * @param string $value Attribute value + * @param string $vless Whether the value is valueless. Use 'y' or 'n' + * @param string $checkname What $checkvalue is checking for. + * @param mixed $checkvalue What constraint the value should pass + * @return bool Whether check passes + */ +function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue) { $ok = true; switch (strtolower($checkname)) { case 'maxlen' : - # The maxlen check makes sure that the attribute value has a length not - # greater than the given value. This can be used to avoid Buffer Overflows - # in WWW clients and various Internet servers. + // 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) $ok = false; break; case 'minlen' : - # The minlen check makes sure that the attribute value has a length not - # smaller than the given value. + // The minlen check makes sure that the attribute value has a length not + // smaller than the given value. if (strlen($value) < $checkvalue) $ok = false; break; case 'maxval' : - # The maxval check does two things: it checks that the attribute value is - # an integer from 0 and up, without an excessive amount of zeroes or - # whitespace (to avoid Buffer Overflows). It also checks that the attribute - # value is not greater than the given value. - # This check can be used to avoid Denial of Service attacks. + // The maxval check does two things: it checks that the attribute value is + // an integer from 0 and up, without an excessive amount of zeroes or + // whitespace (to avoid Buffer Overflows). It also checks that the attribute + // value is not greater than the given value. + // This check can be used to avoid Denial of Service attacks. if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value)) $ok = false; @@ -334,8 +1174,8 @@ function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue) break; case 'minval' : - # The minval check checks that the attribute value is a positive integer, - # and that it is not smaller than the given value. + // The minval check makes sure that the attribute value is a positive integer, + // and that it is not smaller than the given value. if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value)) $ok = false; @@ -344,121 +1184,191 @@ function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue) break; case 'valueless' : - # The valueless check checks if the attribute has a value - # (like ) or not () or not (