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<title>[25541] trunk/src/wp-admin/includes/file.php: When using download_url(), if the resource supplies a Content-MD5 header, verify the downloaded file against it.</title>
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<dt>Revision</dt> <dd><a href="http://core.trac.wordpress.org/changeset/25541">25541</a></dd>
<dt>Author</dt> <dd>dd32</dd>
<dt>Date</dt> <dd>2013-09-21 06:53:50 +0000 (Sat, 21 Sep 2013)</dd>
</dl>
<h3>Log Message</h3>
<pre>When using download_url(), if the resource supplies a Content-MD5 header, verify the downloaded file against it. Fixes <a href="http://core.trac.wordpress.org/ticket/20074">#20074</a></pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpadminincludesfilephp">trunk/src/wp-admin/includes/file.php</a></li>
</ul>
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<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpadminincludesfilephp"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-admin/includes/file.php (25540 => 25541)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-admin/includes/file.php 2013-09-21 06:48:20 UTC (rev 25540)
+++ trunk/src/wp-admin/includes/file.php 2013-09-21 06:53:50 UTC (rev 25541)
</span><span class="lines">@@ -485,10 +485,44 @@
</span><span class="cx"> return new WP_Error( 'http_404', trim( wp_remote_retrieve_response_message( $response ) ) );
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+ $content_md5 = wp_remote_retrieve_header( $response, 'content-md5' );
+ if ( $content_md5 ) {
+ $md5_check = verify_file_md5( $tmpfname, $content_md5 );
+ if ( is_wp_error( $md5_check ) ) {
+ unlink( $tmpfname );
+ return $md5_check;
+ }
+ }
+
</ins><span class="cx"> return $tmpfname;
</span><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> /**
</span><ins>+ * Calculates and compares the MD5 of a file to it's expected value.
+ *
+ * @since 3.7.0
+ *
+ * @param string $filename The filename to check the MD5 of.
+ * @param string $expected_md5 The expected MD5 of the file, either a base64 encoded raw md5, or a hex-encoded md5
+ * @return bool|object WP_Error on failure, true on success, false when the MD5 format is unknown/unexpected
+ */
+function verify_file_md5( $filename, $expected_md5 ) {
+ if ( 32 == strlen( $expected_md5 ) )
+ $expected_raw_md5 = pack( 'H*', $expected_md5 );
+ elseif ( 24 == strlen( $expected_md5 ) )
+ $expected_raw_md5 = base64_decode( $expected_md5 );
+ else
+ return false; // unknown format
+
+ $file_md5 = md5_file( $filename, true );
+
+ if ( $file_md5 === $expected_raw_md5 )
+ return true;
+
+ return new WP_Error( 'md5_mismatch', sprintf( __( 'The checksum of the file (%1$s) does not match the expected checksum value (%2$s).' ), bin2hex( $file_md5 ), bin2hex( $expected_raw_md5 ) ) );
+}
+
+/**
</ins><span class="cx"> * Unzips a specified ZIP file to a location on the Filesystem via the WordPress Filesystem Abstraction.
</span><span class="cx"> * Assumes that WP_Filesystem() has already been called and set up. Does not extract a root-level __MACOSX directory, if present.
</span><span class="cx"> *
</span></span></pre>
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