Changeset 44156

Timestamp:

12/14/2018 03:27:55 AM (4 years ago)

Author:

pento

Message:

KSES: Allow the download attribute on <a> tags.

To avoid this being a vector for bypassing the filetypes that are allowed to be uploaded, this attribute is only allowed to be added without a value.

Merges [43813] from the 5.0 branch to trunk.

Props kalpshit, arshidkv12, welcher, peterwilsoncc, marina_wp, pento.
Fixes #44724.

Location:

trunk

Files:

• . (modified) (1 prop)
• src/wp-includes/kses.php (modified) (1 diff)
• tests/phpunit/tests/kses.php (modified) (1 diff)

trunk/src/wp-includes/kses.php

@@ -62 +62 @@
         'address'    => array(),
         'a'          => array(
-            'href'   => true,
-            'rel'    => true,
-            'rev'    => true,
-            'name'   => true,
-            'target' => true,
+            'href'     => true,
+            'rel'      => true,
+            'rev'      => true,
+            'name'     => true,
+            'target'   => true,
+            'download' => array(
+                'valueless' => 'y',
+            ),
         ),
         'abbr'       => array(),

trunk/tests/phpunit/tests/kses.php

@@ -38 +38 @@
 
         $attributes = array(
-            'class'  => 'classname',
-            'id'     => 'id',
-            'style'  => 'color: red;',
-            'title'  => 'title',
-            'href'   => 'http://example.com',
-            'rel'    => 'related',
-            'rev'    => 'revision',
-            'name'   => 'name',
-            'target' => '_blank',
+            'class'    => 'classname',
+            'id'       => 'id',
+            'style'    => 'color: red;',
+            'title'    => 'title',
+            'href'     => 'http://example.com',
+            'rel'      => 'related',
+            'rev'      => 'revision',
+            'name'     => 'name',
+            'target'   => '_blank',
+            'download' => '',
         );
 
         foreach ( $attributes as $name => $value ) {
-            $string        = "<a $name='$value'>I link this</a>";
-            $expect_string = "<a $name='" . trim( $value, ';' ) . "'>I link this</a>";
+            if ( $value ) {
+                $attr          = "$name='$value'";
+                $expected_attr = "$name='" . trim( $value, ';' ) . "'";
+            } else {
+                $attr = $expected_attr = $name;
+            }
+            $string        = "<a $attr>I link this</a>";
+            $expect_string = "<a $expected_attr>I link this</a>";
             $this->assertEquals( $expect_string, wp_kses( $string, $allowedposttags ) );
         }