secret
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Attack PHP

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kses-badware.php
PHP
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/**
* 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.
*
* @since 1.2.0
*/
if ( ! defined( 'CUSTOM_TAGS' ) )
define( 'CUSTOM_TAGS', false );
 
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(
'class' => array (),
'href' => array (),
'id' => array (),
'title' => array (),
'rel' => array (),
'rev' => array (),
'name' => array (),
'target' => array()),
'abbr' => array(
'class' => array (),
'title' => array ()),
'acronym' => array(
'title' => array ()),
'article' => array(
'align' => array (),
'class' => array (),
'dir' => array (),
'lang' => array(),
'style' => array (),
'xml:lang' => array(),
),
'aside' => array(
'align' => array (),
'class' => array (),
'dir' => array (),
'lang' => array(),
'style' => array (),
'xml:lang' => array(),
),
'b' => array(),
'big' => array(),
'blockquote' => array(
'id' => array (),
'cite' => array (),
'class' => array(),
'lang' => array(),
'xml:lang' => array()),
'br' => array (
'class' => array ()),
'button' => array(
'disabled' => array (),
'name' => array (),
'type' => array (),
'value' => array ()),
'caption' => array(
'align' => array (),
'class' => array ()),
'cite' => array (
'class' => array(),
'dir' => array(),
'lang' => array(),
'title' => array ()),
'code' => array (
'style' => array()),
'col' => array(
'align' => array (),
'char' => array (),
'charoff' => array (),
'span' => array (),
'dir' => array(),
'style' => array (),
'valign' => array (),
'width' => array ()),
'del' => array(
'datetime' => array ()),
'dd' => array(),
'details' => array(
'align' => array (),
'class' => array (),
'dir' => array (),
'lang' => array(),
'open' => array (),
'style' => array (),
'xml:lang' => array(),
),
'div' => array(
'align' => array (),
'class' => array (),
'dir' => array (),
'lang' => array(),
'style' => array (),
'xml:lang' => array()),
'dl' => array(),
'dt' => array(),
'em' => array(),
'fieldset' => array(),
'figure' => array(
'align' => array (),
'class' => array (),
'dir' => array (),
'lang' => array(),
'style' => array (),
'xml:lang' => array(),
),
'figcaption' => array(
'align' => array (),
'class' => array (),
'dir' => array (),
'lang' => array(),
'style' => array (),
'xml:lang' => array(),
),
'font' => array(
'color' => array (),
'face' => array (),
'size' => array ()),
'footer' => array(
'align' => array (),
'class' => array (),
'dir' => array (),
'lang' => array(),
'style' => array (),
'xml:lang' => array(),
),
'form' => array(
'action' => array (),
'accept' => array (),
'accept-charset' => array (),
'enctype' => array (),
'method' => array (),
'name' => array (),
'target' => array ()),
'h1' => array(
'align' => array (),
'class' => array (),
'id' => array (),
'style' => array ()),
'h2' => array (
'align' => array (),
'class' => array (),
'id' => array (),
'style' => array ()),
'h3' => array (
'align' => array (),
'class' => array (),
'id' => array (),
'style' => array ()),
'h4' => array (
'align' => array (),
'class' => array (),
'id' => array (),
'style' => array ()),
'h5' => array (
'align' => array (),
'class' => array (),
'id' => array (),
'style' => array ()),
'h6' => array (
'align' => array (),
'class' => array (),
'id' => array (),
'style' => array ()),
'header' => array(
'align' => array (),
'class' => array (),
'dir' => array (),
'lang' => array(),
'style' => array (),
'xml:lang' => array(),
),
'hgroup' => array(
'align' => array (),
'class' => array (),
'dir' => array (),
'lang' => array(),
'style' => array (),
'xml:lang' => array(),
),
'hr' => array (
'align' => array (),
'class' => array (),
'noshade' => array (),
'size' => array (),
'width' => array ()),
'i' => array(),
'img' => array(
'alt' => array (),
'align' => array (),
'border' => array (),
'class' => array (),
'height' => array (),
'hspace' => array (),
'longdesc' => array (),
'vspace' => array (),
'src' => array (),
'style' => array (),
'width' => array ()),
'ins' => array(
'datetime' => array (),
'cite' => array ()),
'kbd' => array(),
'label' => array(
'for' => array ()),
'legend' => array(
'align' => array ()),
'li' => array (
'align' => array (),
'class' => array ()),
'menu' => array (
'class' => array (),
'style' => array (),
'type' => array ()),
'nav' => array(
'align' => array (),
'class' => array (),
'dir' => array (),
'lang' => array(),
'style' => array (),
'xml:lang' => array(),
),
'p' => array(
'class' => array (),
'align' => array (),
'dir' => array(),
'lang' => array(),
'style' => array (),
'xml:lang' => array()),
'pre' => array(
'style' => array(),
'width' => array ()),
'q' => array(
'cite' => array ()),
's' => array(),
'span' => array (
'class' => array (),
'dir' => array (),
'align' => array (),
'lang' => array (),
'style' => array (),
'title' => array (),
'xml:lang' => array()),
'section' => array(
'align' => array (),
'class' => array (),
'dir' => array (),
'lang' => array(),
'style' => array (),
'xml:lang' => array(),
),
'strike' => array(),
'strong' => array(),
'sub' => array(),
'summary' => array(
'align' => array (),
'class' => array (),
'dir' => array (),
'lang' => array(),
'style' => array (),
'xml:lang' => array(),
),
'sup' => array(),
'table' => array(
'align' => array (),
'bgcolor' => array (),
'border' => array (),
'cellpadding' => array (),
'cellspacing' => array (),
'class' => array (),
'dir' => array(),
'id' => array(),
'rules' => array (),
'style' => 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 (),
'class' => array (),
'colspan' => array (),
'dir' => array(),
'headers' => array (),
'height' => array (),
'nowrap' => array (),
'rowspan' => array (),
'scope' => array (),
'style' => array (),
'valign' => array (),
'width' => array ()),
'textarea' => array(
'cols' => array (),
'rows' => array (),
'disabled' => array (),
'name' => array (),
'readonly' => array ()),
'tfoot' => array(
'align' => array (),
'char' => array (),
'class' => array (),
'charoff' => array (),
'valign' => array ()),
'th' => array(
'abbr' => array (),
'align' => array (),
'axis' => array (),
'bgcolor' => array (),
'char' => array (),
'charoff' => array (),
'class' => 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 (),
'class' => array (),
'valign' => array ()),
'title' => array(),
'tr' => array(
'align' => array (),
'bgcolor' => array (),
'char' => array (),
'charoff' => array (),
'class' => array (),
'style' => array (),
'valign' => array ()),
'tt' => array(),
'u' => array(),
'ul' => array (
'class' => array (),
'style' => array (),
'type' => array ()),
'ol' => array (
'class' => array (),
'start' => array (),
'style' => array (),
'type' => array ()),
'var' => array ());
 
/**
* Kses allowed HTML elements.
*
* @global array $allowedtags
* @since 1.0.0
*/
$allowedtags = array(
'a' => array(
'href' => array (),
'title' => array ()),
'abbr' => array(
'title' => array ()),
'acronym' => array(
'title' => array ()),
'b' => array(),
'blockquote' => array(
'cite' => array ()),
// 'br' => array(),
'cite' => 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(
'cite' => 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',
);
}
 
/**
* 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);
$string = wp_kses_js_entities($string);
$string = wp_kses_normalize_entities($string);
$allowed_html_fixed = wp_kses_array_lc($allowed_html);
$string = wp_kses_hook($string, $allowed_html_fixed, $allowed_protocols); // WP changed the order of these funcs and added args to wp_kses_hook
return wp_kses_split($string, $allowed_html_fixed, $allowed_protocols);
}
 
/**
* 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) {
$string = apply_filters('pre_kses', $string, $allowed_html, $allowed_protocols);
return $string;
}
 
/**
* 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
*
* @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
*/
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
* @uses wp_kses_attr()
*
* @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 '&gt;';
# It matched a ">" character
 
if ( '<!--' == substr( $string, 0, 4 ) ) {
$string = str_replace( array('<!--', '-->'), '', $string );
while ( $string != ($newstring = wp_kses($string, $allowed_html, $allowed_protocols)) )
$string = $newstring;
if ( $string == '' )
return '';
// prevent multiple dashes in comments
$string = preg_replace('/--+/', '-', $string);
// prevent three dashes closing a comment
$string = preg_replace('/-$/', '', $string);
return "<!--{$string}-->";
}
# Allow HTML comments
 
if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $string, $matches))
return '';
# It's seriously malformed
 
$slash = trim($matches[1]);
$elem = $matches[2];
$attrlist = $matches[3];
 
if ( ! isset($allowed_html[strtolower($elem)]) )
return '';
# They are using a not allowed HTML element
 
if ($slash != '')
return "</$elem>";
# No attributes are allowed for closing elements
 
return wp_kses_attr( $elem, $attrlist, $allowed_html, $allowed_protocols );
}
 
/**
* Removes all attributes, if none are allowed for this element.
*
* If some are allowed it calls wp_kses_hair() to split them further, and then
* it builds up new HTML code from the data that kses_hair() returns. It also
* removes "<" and ">" characters, if there are any left. One more thing it does
* is to check if the tag has a closing XHTML slash, and if it does, it puts one
* in the returned code as well.
*
* @since 1.0.0
*
* @param string $element HTML element/tag
* @param string $attr HTML attributes from HTML element to closing HTML element tag
* @param array $allowed_html Allowed HTML elements
* @param array $allowed_protocols Allowed protocols to keep
* @return string Sanitized HTML element
*/
function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) {
# Is there a closing XHTML slash at the end of the attributes?
 
$xhtml_slash = '';
if (preg_match('%\s*/\s*$%', $attr))
$xhtml_slash = ' /';
 
# Are any attributes allowed at all for this element?
if ( ! isset($allowed_html[strtolower($element)]) || count($allowed_html[strtolower($element)]) == 0 )
return "<$element$xhtml_slash>";
 
# Split it
$attrarr = wp_kses_hair($attr, $allowed_protocols);
 
# Go through $attrarr, and save the allowed attributes for this element
# in $attr2
$attr2 = '';
 
$allowed_attr = $allowed_html[strtolower($element)];
foreach ($attrarr as $arreach) {
if ( ! isset( $allowed_attr[strtolower($arreach['name'])] ) )
continue; # the attribute is not allowed
 
$current = $allowed_attr[strtolower($arreach['name'])];
if ( $current == '' )
continue; # the attribute is not allowed
 
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;
}
}
 
if ( strtolower($arreach['name']) == 'style' ) {
$orig_value = $arreach['value'];
$value = safecss_filter_attr($orig_value);
 
if ( empty($value) )
continue;
 
$arreach['value'] = $value;
$arreach['whole'] = str_replace($orig_value, $value, $arreach['whole']);
}
 
if ($ok)
$attr2 .= ' '.$arreach['whole']; # it passed them
} # if !is_array($current)
} # foreach
 
# Remove any "<" or ">" characters
$attr2 = preg_replace('/[<>]/', '', $attr2);
 
return "<$element$attr2$xhtml_slash>";
}
 
/**
* Builds an attribute list from string containing attributes.
*
* This function does a lot of work. It parses an attribute list into an array
* with attribute data, and tries to do the right thing even if it gets weird
* input. It will add quotes around attribute values that don't have any quotes
* or apostrophes around them, to make it easier to produce HTML code that will
* conform to W3C's HTML specification. It will also remove bad URL protocols
* from attribute values. It also reduces duplicate attributes by using the
* attribute defined first (foo='bar' foo='baz' will result in foo='bar').
*
* @since 1.0.0
*
* @param string $attr Attribute list from HTML element to closing HTML element tag
* @param array $allowed_protocols Allowed protocols to keep
* @return array List of attributes after parsing
*/
function wp_kses_hair($attr, $allowed_protocols) {
$attrarr = array ();
$mode = 0;
$attrname = '';
$uris = array('xmlns', 'profile', 'href', 'src', 'cite', 'classid', 'codebase', 'data', 'usemap', 'longdesc', 'action');
 
# Loop through the whole attribute list
 
while (strlen($attr) != 0) {
$working = 0; # Was the last operation successful?
 
switch ($mode) {
case 0 : # attribute name, href for instance
 
if (preg_match('/^([-a-zA-Z]+)/', $attr, $match)) {
$attrname = $match[1];
$working = $mode = 1;
$attr = preg_replace('/^[-a-zA-Z]+/', '', $attr);
}
 
break;
 
case 1 : # equals sign or valueless ("selected")
 
if (preg_match('/^\s*=\s*/', $attr)) # equals sign
{
$working = 1;
$mode = 2;
$attr = preg_replace('/^\s*=\s*/', '', $attr);
break;
}
 
if (preg_match('/^\s+/', $attr)) # valueless
{
$working = 1;
$mode = 0;
if(FALSE === array_key_exists($attrname, $attrarr)) {
$attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y');
}
$attr = preg_replace('/^\s+/', '', $attr);
}
 
break;
 
case 2 : # attribute value, a URL after href= for instance
 
if (preg_match('%^"([^"]*)"(\s+|/?$)%', $attr, $match))
# "value"
{
$thisval = $match[1];
if ( in_array(strtolower($attrname), $uris) )
$thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);
 
if(FALSE === array_key_exists($attrname, $attrarr)) {
$attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n');
}
$working = 1;
$mode = 0;
$attr = preg_replace('/^"[^"]*"(\s+|$)/', '', $attr);
break;
}
 
if (preg_match("%^'([^']*)'(\s+|/?$)%", $attr, $match))
# 'value'
{
$thisval = $match[1];
if ( in_array(strtolower($attrname), $uris) )
$thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);
 
if(FALSE === array_key_exists($attrname, $attrarr)) {
$attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname='$thisval'", 'vless' => 'n');
}
$working = 1;
$mode = 0;
$attr = preg_replace("/^'[^']*'(\s+|$)/", '', $attr);
break;
}
 
if (preg_match("%^([^\s\"']+)(\s+|/?$)%", $attr, $match))
# value
{
$thisval = $match[1];
if ( in_array(strtolower($attrname), $uris) )
$thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);
 
if(FALSE === array_key_exists($attrname, $attrarr)) {
$attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n');
}
# We add quotes to conform to W3C's HTML spec.
$working = 1;
$mode = 0;
$attr = preg_replace("%^[^\s\"']+(\s+|$)%", '', $attr);
}
 
break;
} # switch
 
if ($working == 0) # not well formed, remove and try again
{
$attr = wp_kses_html_error($attr);
$mode = 0;
}
} # while
 
if ($mode == 1 && FALSE === array_key_exists($attrname, $attrarr))
# special case, for when the attribute list ends with a valueless
# attribute like "selected"
$attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y');
 
return $attrarr;
}
 
/**
* 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 NULL characters in $string.
*
* @since 1.0.0
*
* @param string $string
* @return string
*/
function wp_kses_no_null($string) {
$string = preg_replace('/\0+/', '', $string);
$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;
}
 
/**
* Removes the HTML JavaScript entities found in early versions of Netscape 4.
*
* @since 1.0.0
*
* @param string $string
* @return string
*/
function wp_kses_js_entities($string) {
return preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string);
}
 
/**
* 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( '/:|&#0*58;|&#x0*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&amp;T", "&#00058;" to "&#58;", "&#XYZZY;" to "&amp;#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 &amp;
 
$string = str_replace('&', '&amp;', $string);
 
# Change back the allowed entities in our entity whitelist
 
$string = preg_replace_callback('/&amp;([A-Za-z]{2,8});/', 'wp_kses_named_entities', $string);
$string = preg_replace_callback('/&amp;#(0*[0-9]{1,7});/', 'wp_kses_normalize_entities2', $string);
$string = preg_replace_callback('/&amp;#[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
*
* @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, $allowedentitynames) ) ? "&amp;$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 {
$i = "&amp;#$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.
*
* @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)) ) ? "&amp;#x$hexchars;" : '&#x'.ltrim($hexchars,'0').';' );
}
 
/**
* Helper function to determine if a Unicode value is valid.
*
* @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 (&#65; and &#x41;). It doesn't do
* anything with other entities like &auml;, 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()
*
* @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()
*
* @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
* @uses $allowedtags
*
* @param string $data Content to filter, expected to be escaped with slashes
* @return string Filtered content
*/
function wp_filter_kses($data) {
global $allowedtags;
return addslashes( wp_kses(stripslashes( $data ), $allowedtags) );
}
 
/**
* Sanitize content with allowed HTML Kses rules.
*
* @since 2.9.0
* @uses $allowedtags
*
* @param string $data Content to filter, expected to not be escaped
* @return string Filtered content
*/
function wp_kses_data($data) {
global $allowedtags;
return wp_kses( $data , $allowedtags );
}
 
/**
* 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
* @uses $allowedposttags
*
* @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) {
global $allowedposttags;
return addslashes ( wp_kses(stripslashes( $data ), $allowedposttags) );
}
 
/**
* 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
* @uses $allowedposttags
*
* @param string $data Post content to filter
* @return string Filtered post content with allowed HTML tags and attributes intact.
*/
function wp_kses_post($data) {
global $allowedposttags;
return wp_kses( $data , $allowedposttags );
}
 
/**
* 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 ), array()) );
}
 
/**
* 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
* @uses add_filter() See description for what functions are added to what hooks.
*/
function kses_init_filters() {
// Normal filtering.
add_filter('pre_comment_content', 'wp_filter_kses');
add_filter('title_save_pre', 'wp_filter_kses');
 
// Post filtering
add_filter('content_save_pre', 'wp_filter_post_kses');
add_filter('excerpt_save_pre', 'wp_filter_post_kses');
add_filter('content_filtered_save_pre', 'wp_filter_post_kses');
}
 
/**
* 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 'init' hook (priority is
* default). Also does not remove kses_init() function from 'set_current_user'
* hook (priority is also default).
*
* @since 2.0.6
*/
function kses_remove_filters() {
// Normal filtering.
remove_filter('pre_comment_content', 'wp_filter_kses');
remove_filter('title_save_pre', 'wp_filter_kses');
 
// Post filtering
remove_filter('content_save_pre', 'wp_filter_post_kses');
remove_filter('excerpt_save_pre', 'wp_filter_post_kses');
remove_filter('content_filtered_save_pre', 'wp_filter_post_kses');
}
 
/**
* Sets up most of the Kses filters for input form content.
*
* If you remove the kses_init() function from 'init' hook and
* '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.
*
* @uses kses_remove_filters() Removes the Kses filters
* @uses kses_init_filters() Adds the Kses filters back if the user
* does not have unfiltered HTML capability.
* @since 2.0.0
*/
function kses_init() {
kses_remove_filters();
 
if (current_user_can('unfiltered_html') == false)
kses_init_filters();
}
 
add_action('init', 'kses_init');
add_action('set_current_user', 'kses_init');
 
/**
* Inline CSS filter
*
* @since 2.8.1
*/
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 ) );
$allowed_attr = apply_filters( 'safe_style_css', array( 'text-align', 'margin', 'color', 'float',
'border', 'background', 'background-color', 'border-bottom', 'border-bottom-color',
'border-bottom-style', 'border-bottom-width', 'border-collapse', 'border-color', 'border-left',
'border-left-color', 'border-left-style', 'border-left-width', 'border-right', 'border-right-color',
'border-right-style', 'border-right-width', 'border-spacing', 'border-style', 'border-top',
'border-top-color', 'border-top-style', 'border-top-width', 'border-width', 'caption-side',
'clear', 'cursor', 'direction', 'font', 'font-family', 'font-size', 'font-style',
'font-variant', 'font-weight', 'height', 'letter-spacing', 'line-height', 'margin-bottom',
'margin-left', 'margin-right', 'margin-top', 'overflow', 'padding', 'padding-bottom',
'padding-left', 'padding-right', 'padding-top', 'text-decoration', 'text-indent', 'vertical-align',
'width' ) );
 
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 = split( ':', $css_item );
if ( in_array( trim( $parts[0] ), $allowed_attr ) )
$found = true;
}
if ( $found ) {
if( $css != '' )
$css .= ';';
$css .= $css_item;
}
}
 
return $css;
}

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