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Shortcodes: Improve the reliablity of shortcodes inside HTML tags.

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Props miqrogroove.

See #15694.


Built from https://develop.svn.wordpress.org/trunk@33359


git-svn-id: http://core.svn.wordpress.org/trunk@33331 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Gary Pendergast
2015-07-22 05:15:25 +00:00
parent fe5a844be5
commit c3e0ed7e03
5 changed files with 469 additions and 46 deletions
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270
wp-includes/kses.php
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@@ -528,6 +528,81 @@ function wp_kses( $string, $allowed_html, $allowed_protocols = array() ) {
return wp_kses_split($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 . $trail;
}
/**
* Return a list of allowed tags and attributes for a given context.
*
@@ -741,11 +816,10 @@ function wp_kses_split2($string, $allowed_html, $allowed_protocols) {
* @return string Sanitized HTML element
*/
function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) {
// Is there a closing XHTML slash at the end of the attributes?
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))
$xhtml_slash = ' /';
@@ -760,45 +834,11 @@ function wp_kses_attr($element, $attr, $allowed_html, $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 ( 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, $arreach['whole'] );
}
if ( ! is_array($current) ) {
foreach ( $attrarr as $arreach ) {
if ( wp_kses_attr_check( $arreach['name'], $arreach['value'], $arreach['whole'], $arreach['vless'], $element, $allowed_html ) ) {
$attr2 .= ' '.$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 ( $ok )
$attr2 .= ' '.$arreach['whole']; // it passed them
} // if !is_array($current)
} // foreach
}
}
// Remove any "<" or ">" characters
$attr2 = preg_replace('/[<>]/', '', $attr2);
@@ -806,6 +846,53 @@ function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) {
return "<$element$attr2$xhtml_slash>";
}
/**
* 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 ( 'style' == $name_low ) {
$new_value = safecss_filter_attr( $value );
if ( empty( $new_value ) ) {
$name = $value = $whole = '';
return false;
}
$whole = str_replace( $value, $new_value, $whole );
$value = $new_value;
}
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 = $whole = '';
return false;
}
}
}
return true;
}
/**
* Builds an attribute list from string containing attributes.
*
@@ -935,6 +1022,109 @@ function wp_kses_hair($attr, $allowed_protocols) {
return $attrarr;
}
/**
* 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.
*