X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/6c8f14c09105d0afa4c1574215c59b5021040e76..baca9ce86a38dc54c4574890ee2d352fd81f78b2:/wp-includes/http.php

diff --git a/wp-includes/http.php b/wp-includes/http.php
index 56e4f9ff..a196f688 100644
--- a/wp-includes/http.php
+++ b/wp-includes/http.php
@@ -311,3 +311,64 @@ function send_origin_headers() {
 
 	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;
+}