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kses - properly escape non-Unicode entities. Fixes #6583. Props schiller. 

git-svn-id: https://develop.svn.wordpress.org/trunk@8386 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Andrew Ozz 2008-07-21 03:21:09 +00:00
parent a9868e9fd5
commit 11bac00854
1 changed files with 30 additions and 4 deletions
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30
wp-includes/kses.php
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@ -911,7 +911,7 @@ function wp_kses_normalize_entities($string) {
$string = preg_replace('/&([A-Za-z][A-Za-z0-9]{0,19});/', '&\\1;', $string); $string = preg_replace('/&([A-Za-z][A-Za-z0-9]{0,19});/', '&\\1;', $string);
$string = preg_replace_callback('/&#0*([0-9]{1,5});/', create_function('$matches', 'return wp_kses_normalize_entities2($matches[1]);'), $string); $string = preg_replace_callback('/&#0*([0-9]{1,5});/', create_function('$matches', 'return wp_kses_normalize_entities2($matches[1]);'), $string);
$string = preg_replace('/&#([Xx])0*(([0-9A-Fa-f]{2}){1,2});/', '&#\\1\\2;', $string); $string = preg_replace_callback('/&#([Xx])0*(([0-9A-Fa-f]{2}){1,2});/', create_function('$matches', 'return wp_kses_normalize_entities3($matches[2]);'), $string);
return $string; return $string;
} }
@ -928,7 +928,33 @@ function wp_kses_normalize_entities($string) {
* @return string Correctly encoded entity * @return string Correctly encoded entity
*/ */
function wp_kses_normalize_entities2($i) { function wp_kses_normalize_entities2($i) {
return (($i > 65535) ? "&#$i;" : "&#$i;"); return ( (!valid_unicode($i)) || ($i > 65535) ? "&#$i;" : "&#$i;");
}
/**
* wp_kses_normalize_entities3() - 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.
*
* @param string $h Hex string of encoded entity
* @return string Correctly encoded entity
*/
function wp_kses_normalize_entities3($hexchars) {
return ( (!valid_unicode(hexdec($hexchars))) ? "&#x$hexchars;" : "&#x$hexchars;");
}
/**
* valid_unicode() - 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) );
} }
/** /**