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<title>[14400] trunk/wp-admin/includes/file.php:
Ensure image MIME type matches extension for images.</title>
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<dl>
<dt>Revision</dt> <dd><a href="http://trac.wordpress.org/changeset/14400">14400</a></dd>
<dt>Author</dt> <dd>nacin</dd>
<dt>Date</dt> <dd>2010-05-03 20:17:01 +0000 (Mon, 03 May 2010)</dd>
</dl>
<h3>Log Message</h3>
<pre>Ensure image MIME type matches extension for images. props Viper007Bond, fixes <a href="http://trac.wordpress.org/ticket/11946">#11946</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkwpadminincludesfilephp">trunk/wp-admin/includes/file.php</a></li>
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<h3>Diff</h3>
<a id="trunkwpadminincludesfilephp"></a>
<div class="modfile"><h4>Modified: trunk/wp-admin/includes/file.php (14399 => 14400)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-admin/includes/file.php 2010-05-03 20:10:26 UTC (rev 14399)
+++ trunk/wp-admin/includes/file.php 2010-05-03 20:17:01 UTC (rev 14400)
</span><span class="lines">@@ -420,6 +420,36 @@
</span><span class="cx">
</span><span class="cx"> extract( $wp_filetype );
</span><span class="cx">
</span><ins>+ // If the file claims to be an image, validate it's extension
+ if ( function_exists('getimagesize') && !empty( $type ) && 'image/' == substr( $type, 0, 6 ) && is_uploaded_file( $file['tmp_name'] ) ) {
+ // Attempt to figure out what type of image it really is
+ $imgstats = @getimagesize( $file['tmp_name'] );
+
+ // If getimagesize() knows what kind of image it really is and if the real MIME doesn't match the claimed MIME
+ if ( !empty($imgstats['mime']) && $imgstats['mime'] != $type ) {
+ // This is a simplified array of MIMEs that getimagesize() can detect and their extensions
+ $mime_to_ext = apply_filters( 'getimagesize_mimes_to_exts', array(
+ 'image/jpeg' => 'jpg',
+ 'image/png' => 'png',
+ 'image/gif' => 'gif',
+ 'image/bmp' => 'bmp',
+ 'image/tiff' => 'tif',
+ ) );
+
+ // Replace whatever's after the last period in the filename with the correct extension
+ if ( !empty($mime_to_ext[$imgstats['mime']]) ) {
+ $filename_parts = explode( '.', $file['name'] );
+ array_pop( $filename_parts );
+ $filename_parts[] = $mime_to_ext[$imgstats['mime']];
+ $file['name'] = implode( '.', $filename_parts );
+
+ // Re-validate the extension / MIME
+ $wp_filetype = wp_check_filetype( $file['name'], $mimes );
+ extract( $wp_filetype );
+ }
+ }
+ }
+
</ins><span class="cx"> if ( ( !$type || !$ext ) && !current_user_can( 'unfiltered_upload' ) )
</span><span class="cx"> return $upload_error_handler( $file, __( 'File type does not meet security guidelines. Try another.' ));
</span><span class="cx">
</span></span></pre>
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