Better validation of the URL used in core HTTP requests.

git-svn-id: http://core.svn.wordpress.org/trunk@24480 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-importer.php

@@ -183,6 +183,7 @@ class WP_Importer {
 
 		$headers = array();
 		$args = array();
+		$args['reject_unsafe_urls'] = true;
 		if ( true === $head )
 			$args['method'] = 'HEAD';
 		if ( !empty( $username ) && !empty( $password ) )

wp-admin/includes/file.php

@@ -497,7 +497,7 @@ function download_url( $url, $timeout = 300 ) {
 	if ( ! $tmpfname )
 		return new WP_Error('http_no_file', __('Could not create Temporary file.'));
 
-	$response = wp_remote_get( $url, array( 'timeout' => $timeout, 'stream' => true, 'filename' => $tmpfname ) );
+	$response = wp_remote_get( $url, array( 'timeout' => $timeout, 'stream' => true, 'filename' => $tmpfname, 'reject_unsafe_urls' => true ) );
 
 	if ( is_wp_error( $response ) ) {
 		unlink( $tmpfname );

wp-includes/class-feed.php

@@ -66,7 +66,11 @@ class WP_SimplePie_File extends SimplePie_File {
 		$this->method = SIMPLEPIE_FILE_SOURCE_REMOTE;
 
 		if ( preg_match('/^http(s)?:\/\//i', $url) ) {
-			$args = array( 'timeout' => $this->timeout, 'redirection' => $this->redirects);
+			$args = array(
+				'timeout' => $this->timeout,
+				'redirection' => $this->redirects,
+				'reject_unsafe_urls' => true,
+			);
 
 			if ( !empty($this->headers) )
 				$args['headers'] = $this->headers;
@@ -85,12 +89,10 @@ class WP_SimplePie_File extends SimplePie_File {
 				$this->status_code = wp_remote_retrieve_response_code( $res );
 			}
 		} else {
-			if ( ! file_exists($url) || ( ! $this->body = file_get_contents($url) ) ) {
+			$this->error = '';
-				$this->error = 'file_get_contents could not read the file';
 			$this->success = false;
 		}
 	}
-	}
 }
 
 /**

wp-includes/class-http.php

@@ -87,6 +87,7 @@ class WP_Http {
 			'redirection' => apply_filters( 'http_request_redirection_count', 5),
 			'httpversion' => apply_filters( 'http_request_version', '1.0'),
 			'user-agent' => apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' ) ),
+			'reject_unsafe_urls' => apply_filters( 'http_request_reject_unsafe_urls', false ),
 			'blocking' => true,
 			'headers' => array(),
 			'cookies' => array(),
@@ -118,7 +119,11 @@ class WP_Http {
 		if ( false !== $pre )
 			return $pre;
 
-		$arrURL = parse_url( $url );
+		if ( $r['reject_unsafe_urls'] )
+			$url = wp_http_validate_url( $url );
+		$url = wp_kses_bad_protocol( $url, array( 'http', 'https', 'ssl' ) );
+
+		$arrURL = @parse_url( $url );
 
 		if ( empty( $url ) || empty( $arrURL['scheme'] ) )
 			return new WP_Error('http_request_failed', __('A valid URL was not provided.'));
@@ -1146,6 +1151,8 @@ class WP_Http_Curl {
 		// The option doesn't work with safe mode or when open_basedir is set, and there's a
 		// bug #17490 with redirected POST requests, so handle redirections outside Curl.
 		curl_setopt( $handle, CURLOPT_FOLLOWLOCATION, false );
+		if ( defined( 'CURLOPT_PROTOCOLS' ) ) // PHP 5.2.10 / cURL 7.19.4
+			curl_setopt( $handle, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS );
 
 		switch ( $r['method'] ) {
 			case 'HEAD':

wp-includes/class-oembed.php

@@ -113,7 +113,7 @@ class WP_oEmbed {
 		$providers = array();
 
 		// Fetch URL content
-		if ( $html = wp_remote_retrieve_body( wp_remote_get( $url ) ) ) {
+		if ( $html = wp_remote_retrieve_body( wp_remote_get( $url, array( 'reject_unsafe_urls' => true ) ) ) ) {
 
 			// <link> types that contain oEmbed provider URLs
 			$linktypes = apply_filters( 'oembed_linktypes', array(
@@ -195,7 +195,7 @@ class WP_oEmbed {
 	 */
 	function _fetch_with_format( $provider_url_with_args, $format ) {
 		$provider_url_with_args = add_query_arg( 'format', $format, $provider_url_with_args );
-		$response = wp_remote_get( $provider_url_with_args );
+		$response = wp_remote_get( $provider_url_with_args, array( 'reject_unsafe_urls' => true ) );
 		if ( 501 == wp_remote_retrieve_response_code( $response ) )
 			return new WP_Error( 'not-implemented' );
 		if ( ! $body = wp_remote_retrieve_body( $response ) )

wp-includes/class-wp-xmlrpc-server.php

@@ -5396,7 +5396,8 @@ class wp_xmlrpc_server extends IXR_Server {
 		sleep(1);
 
 		// Let's check the remote site
-		$linea = wp_remote_retrieve_body( wp_remote_get( $pagelinkedfrom, array( 'timeout' => 10, 'redirection' => 0 ) ) );
+		$linea = wp_remote_retrieve_body( wp_remote_get( $pagelinkedfrom, array( 'timeout' => 10, 'redirection' => 0, 'reject_unsafe_urls' => true ) ) );
+
 		if ( !$linea )
 	  		return $this->pingback_error( 16, __( 'The source URL does not exist.' ) );
 

wp-includes/comment.php

@@ -1658,7 +1658,7 @@ function discover_pingback_server_uri( $url, $deprecated = '' ) {
 	if ( 0 === strpos($url, $uploads_dir['baseurl']) )
 		return false;
 
-	$response = wp_remote_head( $url, array( 'timeout' => 2, 'httpversion' => '1.0' ) );
+	$response = wp_remote_head( $url, array( 'timeout' => 2, 'httpversion' => '1.0', 'reject_unsafe_urls' => true ) );
 
 	if ( is_wp_error( $response ) )
 		return false;
@@ -1671,7 +1671,7 @@ function discover_pingback_server_uri( $url, $deprecated = '' ) {
 		return false;
 
 	// Now do a GET since we're going to look in the html headers (and we're sure it's not a binary file)
-	$response = wp_remote_get( $url, array( 'timeout' => 2, 'httpversion' => '1.0' ) );
+	$response = wp_remote_get( $url, array( 'timeout' => 2, 'httpversion' => '1.0', 'reject_unsafe_urls' => true ) );
 
 	if ( is_wp_error( $response ) )
 		return false;
@@ -1906,6 +1906,7 @@ function trackback($trackback_url, $title, $excerpt, $ID) {
 
 	$options = array();
 	$options['timeout'] = 4;
+	$options['reject_unsafe_urls'] = true;
 	$options['body'] = array(
 		'title' => $title,
 		'url' => get_permalink($ID),
@@ -1953,62 +1954,13 @@ function weblog_ping($server = '', $path = '') {
  * Default filter attached to pingback_ping_source_uri to validate the pingback's Source URI
  *
  * @since 3.5.1
+ * @see wp_http_validate_url()
  *
  * @param string $source_uri
  * @return string
  */
 function pingback_ping_source_uri( $source_uri ) {
-	$uri = esc_url_raw( $source_uri, array( 'http', 'https' ) );
+	return (string) wp_http_validate_url( $source_uri );
-	if ( ! $uri )
-		return '';
-
-	$parsed_url = @parse_url( $uri );
-	if ( ! $parsed_url )
-		return '';
-
-	if ( isset( $parsed_url['user'] ) || isset( $parsed_url['pass'] ) )
-		return '';
-
-	if ( false !== strpos( $parsed_url['host'], ':' ) )
-		return '';
-
-	$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 '';
-			$parts = array_map( 'intval', explode( '.', $ip ) );
-			if ( 10 === $parts[0] )
-				return '';
-			if ( 172 === $parts[0] && 16 <= $parts[1] && 31 >= $parts[1] )
-				return '';
-			if ( 192 === $parts[0] && 168 === $parts[1] )
-				return '';
-		}
-	}
-
-	if ( empty( $parsed_url['port'] ) )
-		return $uri;
-
-	$port = $parsed_url['port'];
-	if ( 80 === $port || 443 === $port || 8080 === $port )
-		return $uri;
-
-	if ( $parsed_home && $same_host && $parsed_home['port'] === $port )
-		return $uri;
-
-	return '';
 }
 
 /**

wp-includes/functions.php

@@ -496,6 +496,7 @@ function wp_get_http( $url, $file_path = false, $red = 1 ) {
 
 	$options = array();
 	$options['redirection'] = 5;
+	$options['reject_unsafe_urls'] = true;
 
 	if ( false == $file_path )
 		$options['method'] = 'HEAD';
@@ -543,7 +544,7 @@ function wp_get_http_headers( $url, $deprecated = false ) {
 	if ( !empty( $deprecated ) )
 		_deprecated_argument( __FUNCTION__, '2.7' );
 
-	$response = wp_remote_head( $url );
+	$response = wp_remote_head( $url, array( 'reject_unsafe_urls' => true ) );
 
 	if ( is_wp_error( $response ) )
 		return false;
@@ -758,6 +759,7 @@ function wp_remote_fopen( $uri ) {
 
 	$options = array();
 	$options['timeout'] = 10;
+	$options['reject_unsafe_urls'] = true;
 
 	$response = wp_remote_get( $uri, $options );
 

wp-includes/http.php

@@ -330,3 +330,64 @@ 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;
+}

wp-includes/rss.php

@@ -536,7 +536,7 @@ endif;
  * @return Snoopy style response
  */
 function _fetch_remote_file($url, $headers = "" ) {
-	$resp = wp_remote_request($url, array('headers' => $headers, 'timeout' => MAGPIE_FETCH_TIME_OUT));
+	$resp = wp_remote_request($url, array('headers' => $headers, 'timeout' => MAGPIE_FETCH_TIME_OUT, 'reject_unsafe_urls' => true ));
 	if ( is_wp_error($resp) ) {
 		$error = array_shift($resp->errors);