Changeset 24480 for trunk/wp-includes/http.php

Timestamp:

06/21/2013 06:07:47 AM (12 years ago)

Author:

nacin

Message:

Better validation of the URL used in core HTTP requests.

File:

• trunk/wp-includes/http.php (modified) (1 diff)

trunk/wp-includes/http.php

@@ -331 +331 @@
     return false;
 }
+
+/**
+ * Validate a URL for safe use in the HTTP API.
+ *
+ * @since 3.5.2
+ *
+ * @return mixed URL or false on failure.
+ */
+function wp_http_validate_url( $url ) {
+    $url = esc_url_raw( $url, array( 'http', 'https' ) );
+    if ( ! $url )
+        return false;
+
+    $parsed_url = @parse_url( $url );
+    if ( ! $parsed_url )
+        return false;
+
+    if ( isset( $parsed_url['user'] ) || isset( $parsed_url['pass'] ) )
+        return false;
+
+    if ( false !== strpos( $parsed_url['host'], ':' ) )
+        return false;
+
+    $parsed_home = @parse_url( get_option( 'home' ) );
+
+    $same_host = strtolower( $parsed_home['host'] ) === strtolower( $parsed_url['host'] );
+
+    if ( ! $same_host ) {
+        $host = trim( $parsed_url['host'], '.' );
+        if ( preg_match( '#^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$#', $host ) ) {
+            $ip = $host;
+        } else {
+            $ip = gethostbyname( $host );
+            if ( $ip === $host ) // Error condition for gethostbyname()
+                $ip = false;
+        }
+        if ( $ip ) {
+            if ( '127.0.0.1' === $ip )
+                return false;
+            $parts = array_map( 'intval', explode( '.', $ip ) );
+            if ( 10 === $parts[0] )
+                return false;
+            if ( 172 === $parts[0] && 16 <= $parts[1] && 31 >= $parts[1] )
+                return false;
+            if ( 192 === $parts[0] && 168 === $parts[1] )
+                return false;
+        }
+    }
+
+    if ( empty( $parsed_url['port'] ) )
+        return $url;
+
+    $port = $parsed_url['port'];
+    if ( 80 === $port || 443 === $port || 8080 === $port )
+        return $url;
+
+    if ( $parsed_home && $same_host && $parsed_home['port'] === $port )
+        return $url;
+
+    return false;
+}