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oEmbed: Add extra hardening around allowed HTML for improved sandboxing. 

Merges [41448] to 4.5 branch.



Built from https://develop.svn.wordpress.org/branches/4.5@41454


git-svn-id: http://core.svn.wordpress.org/branches/4.5@41287 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Aaron Campbell 2017-09-19 13:50:32 +00:00
parent c3844666a2
commit f1c76c5532
1 changed files with 18 additions and 12 deletions
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30
wp-includes/embed.php
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@ -782,24 +782,30 @@ function wp_filter_oembed_result( $result, $data, $url ) {
}
$html = $content[1] . $content[2];
preg_match( '/ src=([\'"])(.*?)\1/', $html, $results );
if ( ! empty( $results ) ) {
$secret = wp_generate_password( 10, false );
$url = esc_url( "{$results[2]}#?secret=$secret" );
$q = $results[1];
$html = str_replace( $results[0], ' src=' . $q . $url . $q . ' data-secret=' . $q . $secret . $q, $html );
$html = str_replace( '<blockquote', "<blockquote data-secret=\"$secret\"", $html );
}
$allowed_html['blockquote']['data-secret'] = true;
$allowed_html['iframe']['data-secret'] = true;
$html = wp_kses( $html, $allowed_html );
if ( ! empty( $content[1] ) ) {
// We have a blockquote to fall back on. Hide the iframe by default.
$html = str_replace( '<iframe', '<iframe style="position: absolute; clip: rect(1px, 1px, 1px, 1px);"', $html );
$html = str_replace( '<blockquote', '<blockquote class="wp-embedded-content"', $html );
}
$html = str_replace( '<iframe', '<iframe class="wp-embedded-content" sandbox="allow-scripts" security="restricted"', $html );
preg_match( '/ src=[\'"]([^\'"]*)[\'"]/', $html, $results );
if ( ! empty( $results ) ) {
$secret = wp_generate_password( 10, false );
$url = esc_url( "{$results[1]}#?secret=$secret" );
$html = str_replace( $results[0], " src=\"$url\" data-secret=\"$secret\"", $html );
$html = str_replace( '<blockquote', "<blockquote data-secret=\"$secret\"", $html );
}
$html = str_ireplace( '<iframe', '<iframe class="wp-embedded-content" sandbox="allow-scripts" security="restricted"', $html );
return $html;
}