X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/38ca813a0e312e2768e5b9519f0415cd0aa84781..46588ee871246a923d972538dbc93b26f4fda932:/wp-includes/http.php

diff --git a/wp-includes/http.php b/wp-includes/http.php
index a909e001..02b653f5 100644
--- a/wp-includes/http.php
+++ b/wp-includes/http.php
@@ -4,7 +4,7 @@
  *
  * Will eventually replace and standardize the WordPress HTTP requests made.
  *
- * @link http://trac.wordpress.org/ticket/4779 HTTP API Proposal
+ * @link https://core.trac.wordpress.org/ticket/4779 HTTP API Proposal
  *
  * @package WordPress
  * @subpackage HTTP
@@ -19,7 +19,7 @@
  *
  * @return WP_Http HTTP Transport object.
  */
-function &_wp_http_get_object() {
+function _wp_http_get_object() {
 	static $http;
 
 	if ( is_null($http) )
@@ -28,31 +28,124 @@ function &_wp_http_get_object() {
 	return $http;
 }
 
+/**
+ * Retrieve the raw response from a safe HTTP request.
+ *
+ * This function is ideal when the HTTP request is being made to an arbitrary
+ * URL. The URL is validated to avoid redirection and request forgery attacks.
+ *
+ * @since 3.6.0
+ *
+ * @see wp_remote_request() For more information on the response array format.
+ * @see WP_Http::request() For default arguments information.
+ *
+ * @param string $url  Site URL to retrieve.
+ * @param array  $args Optional. Request arguments. Default empty array.
+ * @return WP_Error|array The response or WP_Error on failure.
+ */
+function wp_safe_remote_request( $url, $args = array() ) {
+	$args['reject_unsafe_urls'] = true;
+	$http = _wp_http_get_object();
+	return $http->request( $url, $args );
+}
+
+/**
+ * Retrieve the raw response from a safe HTTP request using the GET method.
+ *
+ * This function is ideal when the HTTP request is being made to an arbitrary
+ * URL. The URL is validated to avoid redirection and request forgery attacks.
+ *
+ * @since 3.6.0
+ *
+ * @see wp_remote_request() For more information on the response array format.
+ * @see WP_Http::request() For default arguments information.
+ *
+ * @param string $url  Site URL to retrieve.
+ * @param array  $args Optional. Request arguments. Default empty array.
+ * @return WP_Error|array The response or WP_Error on failure.
+ */
+function wp_safe_remote_get( $url, $args = array() ) {
+	$args['reject_unsafe_urls'] = true;
+	$http = _wp_http_get_object();
+	return $http->get( $url, $args );
+}
+
+/**
+ * Retrieve the raw response from a safe HTTP request using the POST method.
+ *
+ * This function is ideal when the HTTP request is being made to an arbitrary
+ * URL. The URL is validated to avoid redirection and request forgery attacks.
+ *
+ * @since 3.6.0
+ *
+ * @see wp_remote_request() For more information on the response array format.
+ * @see WP_Http::request() For default arguments information.
+ *
+ * @param string $url  Site URL to retrieve.
+ * @param array  $args Optional. Request arguments. Default empty array.
+ * @return WP_Error|array The response or WP_Error on failure.
+ */
+function wp_safe_remote_post( $url, $args = array() ) {
+	$args['reject_unsafe_urls'] = true;
+	$http = _wp_http_get_object();
+	return $http->post( $url, $args );
+}
+
+/**
+ * Retrieve the raw response from a safe HTTP request using the HEAD method.
+ *
+ * This function is ideal when the HTTP request is being made to an arbitrary
+ * URL. The URL is validated to avoid redirection and request forgery attacks.
+ *
+ * @since 3.6.0
+ *
+ * @see wp_remote_request() For more information on the response array format.
+ * @see WP_Http::request() For default arguments information.
+ *
+ * @param string $url Site URL to retrieve.
+ * @param array $args Optional. Request arguments. Default empty array.
+ * @return WP_Error|array The response or WP_Error on failure.
+ */
+function wp_safe_remote_head( $url, $args = array() ) {
+	$args['reject_unsafe_urls'] = true;
+	$http = _wp_http_get_object();
+	return $http->head( $url, $args );
+}
+
 /**
  * Retrieve the raw response from the HTTP request.
  *
- * The array structure is a little complex.
+ * The array structure is a little complex:
  *
- * <code>
- * $res = array( 'headers' => array(), 'response' => array('code' => int, 'message' => string) );
- * </code>
+ *     $res = array(
+ *         'headers'  => array(),
+ *         'response' => array(
+ *             'code'    => int,
+ *             'message' => string
+ *         )
+ *     );
  *
  * All of the headers in $res['headers'] are with the name as the key and the
  * value as the value. So to get the User-Agent, you would do the following.
  *
- * <code>
- * $user_agent = $res['headers']['user-agent'];
- * </code>
+ *     $user_agent = $res['headers']['user-agent'];
  *
  * The body is the raw response content and can be retrieved from $res['body'].
  *
  * This function is called first to make the request and there are other API
  * functions to abstract out the above convoluted setup.
  *
+ * Request method defaults for helper functions:
+ *  - Default 'GET'  for wp_remote_get()
+ *  - Default 'POST' for wp_remote_post()
+ *  - Default 'HEAD' for wp_remote_head()
+ *
  * @since 2.7.0
  *
- * @param string $url Site URL to retrieve.
- * @param array $args Optional. Override the defaults.
+ * @see WP_Http::request() For additional information on default arguments.
+ *
+ * @param string $url  Site URL to retrieve.
+ * @param array  $args Optional. Request arguments. Default empty array.
  * @return WP_Error|array The response or WP_Error on failure.
  */
 function wp_remote_request($url, $args = array()) {
@@ -63,12 +156,13 @@ function wp_remote_request($url, $args = array()) {
 /**
  * Retrieve the raw response from the HTTP request using the GET method.
  *
- * @see wp_remote_request() For more information on the response array format.
- *
  * @since 2.7.0
  *
- * @param string $url Site URL to retrieve.
- * @param array $args Optional. Override the defaults.
+ * @see wp_remote_request() For more information on the response array format.
+ * @see WP_Http::request() For default arguments information.
+ *
+ * @param string $url  Site URL to retrieve.
+ * @param array  $args Optional. Request arguments. Default empty array.
  * @return WP_Error|array The response or WP_Error on failure.
  */
 function wp_remote_get($url, $args = array()) {
@@ -79,12 +173,13 @@ function wp_remote_get($url, $args = array()) {
 /**
  * Retrieve the raw response from the HTTP request using the POST method.
  *
- * @see wp_remote_request() For more information on the response array format.
- *
  * @since 2.7.0
  *
- * @param string $url Site URL to retrieve.
- * @param array $args Optional. Override the defaults.
+ * @see wp_remote_request() For more information on the response array format.
+ * @see WP_Http::request() For default arguments information.
+ *
+ * @param string $url  Site URL to retrieve.
+ * @param array  $args Optional. Request arguments. Default empty array.
  * @return WP_Error|array The response or WP_Error on failure.
  */
 function wp_remote_post($url, $args = array()) {
@@ -95,12 +190,13 @@ function wp_remote_post($url, $args = array()) {
 /**
  * Retrieve the raw response from the HTTP request using the HEAD method.
  *
- * @see wp_remote_request() For more information on the response array format.
- *
  * @since 2.7.0
  *
- * @param string $url Site URL to retrieve.
- * @param array $args Optional. Override the defaults.
+ * @see wp_remote_request() For more information on the response array format.
+ * @see WP_Http::request() For default arguments information.
+ *
+ * @param string $url  Site URL to retrieve.
+ * @param array  $args Optional. Request arguments. Default empty array.
  * @return WP_Error|array The response or WP_Error on failure.
  */
 function wp_remote_head($url, $args = array()) {
@@ -116,7 +212,7 @@ function wp_remote_head($url, $args = array()) {
  * @param array $response HTTP response.
  * @return array The headers of the response. Empty array if incorrect parameter given.
  */
-function wp_remote_retrieve_headers(&$response) {
+function wp_remote_retrieve_headers( $response ) {
 	if ( is_wp_error($response) || ! isset($response['headers']) || ! is_array($response['headers']))
 		return array();
 
@@ -130,9 +226,9 @@ function wp_remote_retrieve_headers(&$response) {
  *
  * @param array $response
  * @param string $header Header name to retrieve value from.
- * @return string The header value. Empty string on if incorrect parameter given, or if the header doesnt exist.
+ * @return string The header value. Empty string on if incorrect parameter given, or if the header doesn't exist.
  */
-function wp_remote_retrieve_header(&$response, $header) {
+function wp_remote_retrieve_header( $response, $header ) {
 	if ( is_wp_error($response) || ! isset($response['headers']) || ! is_array($response['headers']))
 		return '';
 
@@ -150,9 +246,9 @@ function wp_remote_retrieve_header(&$response, $header) {
  * @since 2.7.0
  *
  * @param array $response HTTP response.
- * @return string the response code. Empty string on incorrect parameter given.
+ * @return int|string The response code as an integer. Empty string on incorrect parameter given.
  */
-function wp_remote_retrieve_response_code(&$response) {
+function wp_remote_retrieve_response_code( $response ) {
 	if ( is_wp_error($response) || ! isset($response['response']) || ! is_array($response['response']))
 		return '';
 
@@ -169,7 +265,7 @@ function wp_remote_retrieve_response_code(&$response) {
  * @param array $response HTTP response.
  * @return string The response message. Empty string on incorrect parameter given.
  */
-function wp_remote_retrieve_response_message(&$response) {
+function wp_remote_retrieve_response_message( $response ) {
 	if ( is_wp_error($response) || ! isset($response['response']) || ! is_array($response['response']))
 		return '';
 
@@ -184,7 +280,7 @@ function wp_remote_retrieve_response_message(&$response) {
  * @param array $response HTTP response.
  * @return string The body of the response. Empty string if no body or incorrect parameter given.
  */
-function wp_remote_retrieve_body(&$response) {
+function wp_remote_retrieve_body( $response ) {
 	if ( is_wp_error($response) || ! isset($response['body']) )
 		return '';
 
@@ -197,7 +293,7 @@ function wp_remote_retrieve_body(&$response) {
  * @since 3.2.0
  *
  * @param array  $capabilities Array of capabilities to test or a wp_remote_request() $args array.
- * @param string $url Optional.  If given, will check if the URL requires SSL and adds that requirement to the capabilities array.
+ * @param string $url Optional. If given, will check if the URL requires SSL and adds that requirement to the capabilities array.
  *
  * @return bool
  */
@@ -222,3 +318,235 @@ function wp_http_supports( $capabilities = array(), $url = null ) {
 
 	return (bool) $objFetchSite->_get_first_available_transport( $capabilities );
 }
+
+/**
+ * Get the HTTP Origin of the current request.
+ *
+ * @since 3.4.0
+ *
+ * @return string URL of the origin. Empty string if no origin.
+ */
+function get_http_origin() {
+	$origin = '';
+	if ( ! empty ( $_SERVER[ 'HTTP_ORIGIN' ] ) )
+		$origin = $_SERVER[ 'HTTP_ORIGIN' ];
+
+	/**
+	 * Change the origin of an HTTP request.
+	 *
+	 * @since 3.4.0
+	 *
+	 * @param string $origin The original origin for the request.
+	 */
+	return apply_filters( 'http_origin', $origin );
+}
+
+/**
+ * Retrieve list of allowed HTTP origins.
+ *
+ * @since 3.4.0
+ *
+ * @return array Array of origin URLs.
+ */
+function get_allowed_http_origins() {
+	$admin_origin = parse_url( admin_url() );
+	$home_origin = parse_url( home_url() );
+
+	// @todo preserve port?
+	$allowed_origins = array_unique( array(
+		'http://' . $admin_origin[ 'host' ],
+		'https://' . $admin_origin[ 'host' ],
+		'http://' . $home_origin[ 'host' ],
+		'https://' . $home_origin[ 'host' ],
+	) );
+
+	/**
+	 * Change the origin types allowed for HTTP requests.
+	 *
+	 * @since 3.4.0
+	 *
+	 * @param array $allowed_origins {
+	 *     Default allowed HTTP origins.
+	 *     @type string Non-secure URL for admin origin.
+	 *     @type string Secure URL for admin origin.
+	 *     @type string Non-secure URL for home origin.
+	 *     @type string Secure URL for home origin.
+	 * }
+	 */
+	return apply_filters( 'allowed_http_origins' , $allowed_origins );
+}
+
+/**
+ * Determines if the HTTP origin is an authorized one.
+ *
+ * @since 3.4.0
+ *
+ * @param null|string $origin Origin URL. If not provided, the value of get_http_origin() is used.
+ * @return bool|null True if the origin is allowed. False otherwise.
+ */
+function is_allowed_http_origin( $origin = null ) {
+	$origin_arg = $origin;
+
+	if ( null === $origin )
+		$origin = get_http_origin();
+
+	if ( $origin && ! in_array( $origin, get_allowed_http_origins() ) )
+		$origin = '';
+
+	/**
+	 * Change the allowed HTTP origin result.
+	 *
+	 * @since 3.4.0
+	 *
+	 * @param string $origin Result of check for allowed origin.
+	 * @param string $origin_arg original origin string passed into is_allowed_http_origin function.
+	 */
+	return apply_filters( 'allowed_http_origin', $origin, $origin_arg );
+}
+
+/**
+ * Send Access-Control-Allow-Origin and related headers if the current request
+ * is from an allowed origin.
+ *
+ * If the request is an OPTIONS request, the script exits with either access
+ * control headers sent, or a 403 response if the origin is not allowed. For
+ * other request methods, you will receive a return value.
+ *
+ * @since 3.4.0
+ *
+ * @return bool|string Returns the origin URL if headers are sent. Returns false
+ * if headers are not sent.
+ */
+function send_origin_headers() {
+	$origin = get_http_origin();
+
+	if ( is_allowed_http_origin( $origin ) ) {
+		@header( 'Access-Control-Allow-Origin: ' .  $origin );
+		@header( 'Access-Control-Allow-Credentials: true' );
+		if ( 'OPTIONS' === $_SERVER['REQUEST_METHOD'] )
+			exit;
+		return $origin;
+	}
+
+	if ( 'OPTIONS' === $_SERVER['REQUEST_METHOD'] ) {
+		status_header( 403 );
+		exit;
+	}
+
+	return false;
+}
+
+/**
+ * Validate a URL for safe use in the HTTP API.
+ *
+ * @since 3.5.2
+ *
+ * @param string $url
+ * @return false|string URL or false on failure.
+ */
+function wp_http_validate_url( $url ) {
+	$original_url = $url;
+	$url = wp_kses_bad_protocol( $url, array( 'http', 'https' ) );
+	if ( ! $url || strtolower( $url ) !== strtolower( $original_url ) )
+		return false;
+
+	$parsed_url = @parse_url( $url );
+	if ( ! $parsed_url || empty( $parsed_url['host'] ) )
+		return false;
+
+	if ( isset( $parsed_url['user'] ) || isset( $parsed_url['pass'] ) )
+		return false;
+
+	if ( false !== strpbrk( $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 ) {
+			$parts = array_map( 'intval', explode( '.', $ip ) );
+			if ( 127 === $parts[0] || 10 === $parts[0]
+				|| ( 172 === $parts[0] && 16 <= $parts[1] && 31 >= $parts[1] )
+				|| ( 192 === $parts[0] && 168 === $parts[1] )
+			) {
+				// If host appears local, reject unless specifically allowed.
+				/**
+				 * Check if HTTP request is external or not.
+				 *
+				 * Allows to change and allow external requests for the HTTP request.
+				 *
+				 * @since 3.6.0
+				 *
+				 * @param bool false Whether HTTP request is external or not.
+				 * @param string $host IP of the requested host.
+				 * @param string $url URL of the requested host.
+				 */
+				if ( ! apply_filters( 'http_request_host_is_external', false, $host, $url ) )
+					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 && isset( $parsed_home['port'] ) && $parsed_home['port'] === $port )
+		return $url;
+
+	return false;
+}
+
+/**
+ * Whitelists allowed redirect hosts for safe HTTP requests as well.
+ *
+ * Attached to the http_request_host_is_external filter.
+ *
+ * @since 3.6.0
+ *
+ * @param bool $is_external
+ * @param string $host
+ * @return bool
+ */
+function allowed_http_request_hosts( $is_external, $host ) {
+	if ( ! $is_external && wp_validate_redirect( 'http://' . $host ) )
+		$is_external = true;
+	return $is_external;
+}
+
+/**
+ * Whitelists any domain in a multisite installation for safe HTTP requests.
+ *
+ * Attached to the http_request_host_is_external filter.
+ *
+ * @since 3.6.0
+ *
+ * @param bool $is_external
+ * @param string $host
+ * @return bool
+ */
+function ms_allowed_http_request_hosts( $is_external, $host ) {
+	global $wpdb;
+	static $queried = array();
+	if ( $is_external )
+		return $is_external;
+	if ( $host === get_current_site()->domain )
+		return true;
+	if ( isset( $queried[ $host ] ) )
+		return $queried[ $host ];
+	$queried[ $host ] = (bool) $wpdb->get_var( $wpdb->prepare( "SELECT domain FROM $wpdb->blogs WHERE domain = %s LIMIT 1", $host ) );
+	return $queried[ $host ];
+}