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Don't strip `\0` (backslash+zero) from post content for users without "unfiltered_html" 

Adds unit tests.

Props miqrogroove.
Fixes #28699.


git-svn-id: https://develop.svn.wordpress.org/trunk@32860 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Scott Taylor 2015-06-19 18:46:11 +00:00
parent bd272f3188
commit a06f5f6d90
2 changed files with 64 additions and 4 deletions
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15
src/wp-includes/kses.php
View File

@ -521,7 +521,7 @@ if ( ! CUSTOM_TAGS ) {
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_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, $allowed_protocols); // WP changed the order of these funcs and added args to wp_kses_hook
@ -1044,11 +1044,18 @@ function wp_kses_bad_protocol($string, $allowed_protocols) {
* @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) {
$string = preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '', $string);
$string = preg_replace('/(\\\\0)+/', '', $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;
}

53
tests/phpunit/tests/kses.php
View File

@ -411,4 +411,57 @@ EOF;
),
);
}
/**
* Test removal of '\0' strings.
*
* @ticket 28699
* @dataProvider data_slash_zero_removal
*/
function test_slash_zero_removal( $input, $output ) {
global $allowedposttags;
return $this->assertEquals( $output, wp_kses( $input, $allowedposttags ) );
}
function data_slash_zero_removal() {
return array(
array(
'This \\0 should be no big deal.',
'This \\0 should be no big deal.',
),
array(
'<div>This \\0 should be no big deal.</div>',
'<div>This \\0 should be no big deal.</div>',
),
array(
'<div align="\\0left">This should be no big deal.</div>',
'<div align="\\0left">This should be no big deal.</div>',
),
array(
'This <div style="float:\\0left"> is more of a concern.',
'This <div style="float:left"> is more of a concern.',
),
array(
'This <div style="float:\\0\\0left"> is more of a concern.',
'This <div style="float:left"> is more of a concern.',
),
array(
'This <div style="float:\\\\00left"> is more of a concern.',
'This <div style="float:left"> is more of a concern.',
),
array(
'This <div style="float:\\\\\\\\0000left"> is more of a concern.',
'This <div style="float:left"> is more of a concern.',
),
array(
'This <div style="float:\\0000left"> is more of a concern.',
'This <div style="float:left"> is more of a concern.',
),
array(
'<style type="text/css">div {background-image:\\0}</style>',
'div {background-image:\\0}',
),
);
}
}