471 lines
15 KiB
PHP
471 lines
15 KiB
PHP
<?php
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/**
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* HTTP API: WP_Http_Streams class
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*
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* @package WordPress
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* @subpackage HTTP
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* @since 4.4.0
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*/
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/**
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* Core class used to integrate PHP Streams as an HTTP transport.
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*
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* @since 2.7.0
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* @since 3.7.0 Combined with the fsockopen transport and switched to `stream_socket_client()`.
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*/
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class WP_Http_Streams {
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/**
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* Send a HTTP request to a URI using PHP Streams.
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*
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* @see WP_Http::request For default options descriptions.
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*
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* @since 2.7.0
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* @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().
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*
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* @param string $url The request URL.
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* @param string|array $args Optional. Override the defaults.
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* @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
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*/
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public function request( $url, $args = array() ) {
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$defaults = array(
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'method' => 'GET',
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'timeout' => 5,
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'redirection' => 5,
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'httpversion' => '1.0',
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'blocking' => true,
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'headers' => array(),
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'body' => null,
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'cookies' => array(),
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);
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$r = wp_parse_args( $args, $defaults );
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if ( isset( $r['headers']['User-Agent'] ) ) {
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$r['user-agent'] = $r['headers']['User-Agent'];
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unset( $r['headers']['User-Agent'] );
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} elseif ( isset( $r['headers']['user-agent'] ) ) {
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$r['user-agent'] = $r['headers']['user-agent'];
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unset( $r['headers']['user-agent'] );
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}
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// Construct Cookie: header if any cookies are set.
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WP_Http::buildCookieHeader( $r );
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$arrURL = parse_url( $url );
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$connect_host = $arrURL['host'];
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$secure_transport = ( $arrURL['scheme'] == 'ssl' || $arrURL['scheme'] == 'https' );
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if ( ! isset( $arrURL['port'] ) ) {
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if ( $arrURL['scheme'] == 'ssl' || $arrURL['scheme'] == 'https' ) {
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$arrURL['port'] = 443;
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$secure_transport = true;
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} else {
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$arrURL['port'] = 80;
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}
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}
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// Always pass a Path, defaulting to the root in cases such as http://example.com
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if ( ! isset( $arrURL['path'] ) ) {
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$arrURL['path'] = '/';
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}
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if ( isset( $r['headers']['Host'] ) || isset( $r['headers']['host'] ) ) {
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if ( isset( $r['headers']['Host'] ) ) {
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$arrURL['host'] = $r['headers']['Host'];
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} else {
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$arrURL['host'] = $r['headers']['host'];
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}
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unset( $r['headers']['Host'], $r['headers']['host'] );
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}
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/*
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* Certain versions of PHP have issues with 'localhost' and IPv6, It attempts to connect
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* to ::1, which fails when the server is not set up for it. For compatibility, always
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* connect to the IPv4 address.
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*/
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if ( 'localhost' == strtolower( $connect_host ) ) {
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$connect_host = '127.0.0.1';
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}
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$connect_host = $secure_transport ? 'ssl://' . $connect_host : 'tcp://' . $connect_host;
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$is_local = isset( $r['local'] ) && $r['local'];
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$ssl_verify = isset( $r['sslverify'] ) && $r['sslverify'];
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if ( $is_local ) {
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/**
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* Filters whether SSL should be verified for local requests.
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*
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* @since 2.8.0
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* @since 5.1.0 The `$url` parameter was added.
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*
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* @param bool $ssl_verify Whether to verify the SSL connection. Default true.
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* @param string $url The request URL.
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*/
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$ssl_verify = apply_filters( 'https_local_ssl_verify', $ssl_verify, $url );
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} elseif ( ! $is_local ) {
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/** This filter is documented in wp-includes/class-http.php */
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$ssl_verify = apply_filters( 'https_ssl_verify', $ssl_verify, $url );
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}
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$proxy = new WP_HTTP_Proxy();
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$context = stream_context_create(
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array(
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'ssl' => array(
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'verify_peer' => $ssl_verify,
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//'CN_match' => $arrURL['host'], // This is handled by self::verify_ssl_certificate()
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'capture_peer_cert' => $ssl_verify,
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'SNI_enabled' => true,
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'cafile' => $r['sslcertificates'],
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'allow_self_signed' => ! $ssl_verify,
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),
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)
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);
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$timeout = (int) floor( $r['timeout'] );
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$utimeout = $timeout == $r['timeout'] ? 0 : 1000000 * $r['timeout'] % 1000000;
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$connect_timeout = max( $timeout, 1 );
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// Store error number.
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$connection_error = null;
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// Store error string.
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$connection_error_str = null;
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if ( ! WP_DEBUG ) {
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// In the event that the SSL connection fails, silence the many PHP Warnings.
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if ( $secure_transport ) {
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$error_reporting = error_reporting( 0 );
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}
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if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {
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$handle = @stream_socket_client( 'tcp://' . $proxy->host() . ':' . $proxy->port(), $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );
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} else {
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$handle = @stream_socket_client( $connect_host . ':' . $arrURL['port'], $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );
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}
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if ( $secure_transport ) {
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error_reporting( $error_reporting );
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}
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} else {
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if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {
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$handle = stream_socket_client( 'tcp://' . $proxy->host() . ':' . $proxy->port(), $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );
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} else {
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$handle = stream_socket_client( $connect_host . ':' . $arrURL['port'], $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );
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}
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}
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if ( false === $handle ) {
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// SSL connection failed due to expired/invalid cert, or, OpenSSL configuration is broken.
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if ( $secure_transport && 0 === $connection_error && '' === $connection_error_str ) {
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return new WP_Error( 'http_request_failed', __( 'The SSL certificate for the host could not be verified.' ) );
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}
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return new WP_Error( 'http_request_failed', $connection_error . ': ' . $connection_error_str );
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}
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// Verify that the SSL certificate is valid for this request.
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if ( $secure_transport && $ssl_verify && ! $proxy->is_enabled() ) {
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if ( ! self::verify_ssl_certificate( $handle, $arrURL['host'] ) ) {
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return new WP_Error( 'http_request_failed', __( 'The SSL certificate for the host could not be verified.' ) );
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}
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}
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stream_set_timeout( $handle, $timeout, $utimeout );
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if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) { //Some proxies require full URL in this field.
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$requestPath = $url;
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} else {
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$requestPath = $arrURL['path'] . ( isset( $arrURL['query'] ) ? '?' . $arrURL['query'] : '' );
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}
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$strHeaders = strtoupper( $r['method'] ) . ' ' . $requestPath . ' HTTP/' . $r['httpversion'] . "\r\n";
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$include_port_in_host_header = (
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( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) ||
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( 'http' == $arrURL['scheme'] && 80 != $arrURL['port'] ) ||
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( 'https' == $arrURL['scheme'] && 443 != $arrURL['port'] )
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);
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if ( $include_port_in_host_header ) {
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$strHeaders .= 'Host: ' . $arrURL['host'] . ':' . $arrURL['port'] . "\r\n";
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} else {
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$strHeaders .= 'Host: ' . $arrURL['host'] . "\r\n";
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}
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if ( isset( $r['user-agent'] ) ) {
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$strHeaders .= 'User-agent: ' . $r['user-agent'] . "\r\n";
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}
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if ( is_array( $r['headers'] ) ) {
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foreach ( (array) $r['headers'] as $header => $headerValue ) {
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$strHeaders .= $header . ': ' . $headerValue . "\r\n";
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}
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} else {
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$strHeaders .= $r['headers'];
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}
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if ( $proxy->use_authentication() ) {
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$strHeaders .= $proxy->authentication_header() . "\r\n";
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}
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$strHeaders .= "\r\n";
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if ( ! is_null( $r['body'] ) ) {
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$strHeaders .= $r['body'];
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}
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fwrite( $handle, $strHeaders );
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if ( ! $r['blocking'] ) {
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stream_set_blocking( $handle, 0 );
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fclose( $handle );
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return array(
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'headers' => array(),
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'body' => '',
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'response' => array(
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'code' => false,
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'message' => false,
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),
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'cookies' => array(),
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);
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}
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$strResponse = '';
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$bodyStarted = false;
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$keep_reading = true;
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$block_size = 4096;
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if ( isset( $r['limit_response_size'] ) ) {
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$block_size = min( $block_size, $r['limit_response_size'] );
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}
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// If streaming to a file setup the file handle.
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if ( $r['stream'] ) {
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if ( ! WP_DEBUG ) {
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$stream_handle = @fopen( $r['filename'], 'w+' );
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} else {
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$stream_handle = fopen( $r['filename'], 'w+' );
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}
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if ( ! $stream_handle ) {
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return new WP_Error(
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'http_request_failed',
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sprintf(
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/* translators: 1: fopen(), 2: file name */
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__( 'Could not open handle for %1$s to %2$s.' ),
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'fopen()',
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$r['filename']
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)
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);
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}
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$bytes_written = 0;
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while ( ! feof( $handle ) && $keep_reading ) {
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$block = fread( $handle, $block_size );
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if ( ! $bodyStarted ) {
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$strResponse .= $block;
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if ( strpos( $strResponse, "\r\n\r\n" ) ) {
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$process = WP_Http::processResponse( $strResponse );
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$bodyStarted = true;
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$block = $process['body'];
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unset( $strResponse );
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$process['body'] = '';
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}
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}
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$this_block_size = strlen( $block );
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if ( isset( $r['limit_response_size'] ) && ( $bytes_written + $this_block_size ) > $r['limit_response_size'] ) {
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$this_block_size = ( $r['limit_response_size'] - $bytes_written );
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$block = substr( $block, 0, $this_block_size );
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}
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$bytes_written_to_file = fwrite( $stream_handle, $block );
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if ( $bytes_written_to_file != $this_block_size ) {
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fclose( $handle );
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fclose( $stream_handle );
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return new WP_Error( 'http_request_failed', __( 'Failed to write request to temporary file.' ) );
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}
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$bytes_written += $bytes_written_to_file;
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$keep_reading = ! isset( $r['limit_response_size'] ) || $bytes_written < $r['limit_response_size'];
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}
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fclose( $stream_handle );
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} else {
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$header_length = 0;
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while ( ! feof( $handle ) && $keep_reading ) {
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$block = fread( $handle, $block_size );
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$strResponse .= $block;
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if ( ! $bodyStarted && strpos( $strResponse, "\r\n\r\n" ) ) {
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$header_length = strpos( $strResponse, "\r\n\r\n" ) + 4;
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$bodyStarted = true;
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}
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$keep_reading = ( ! $bodyStarted || ! isset( $r['limit_response_size'] ) || strlen( $strResponse ) < ( $header_length + $r['limit_response_size'] ) );
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}
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$process = WP_Http::processResponse( $strResponse );
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unset( $strResponse );
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}
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fclose( $handle );
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$arrHeaders = WP_Http::processHeaders( $process['headers'], $url );
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$response = array(
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'headers' => $arrHeaders['headers'],
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// Not yet processed.
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'body' => null,
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'response' => $arrHeaders['response'],
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'cookies' => $arrHeaders['cookies'],
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'filename' => $r['filename'],
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);
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// Handle redirects.
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if ( false !== ( $redirect_response = WP_Http::handle_redirects( $url, $r, $response ) ) ) {
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return $redirect_response;
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}
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// If the body was chunk encoded, then decode it.
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if ( ! empty( $process['body'] ) && isset( $arrHeaders['headers']['transfer-encoding'] ) && 'chunked' == $arrHeaders['headers']['transfer-encoding'] ) {
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$process['body'] = WP_Http::chunkTransferDecode( $process['body'] );
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}
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if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode( $arrHeaders['headers'] ) ) {
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$process['body'] = WP_Http_Encoding::decompress( $process['body'] );
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}
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if ( isset( $r['limit_response_size'] ) && strlen( $process['body'] ) > $r['limit_response_size'] ) {
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$process['body'] = substr( $process['body'], 0, $r['limit_response_size'] );
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}
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$response['body'] = $process['body'];
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return $response;
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}
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/**
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* Verifies the received SSL certificate against its Common Names and subjectAltName fields.
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*
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* PHP's SSL verifications only verify that it's a valid Certificate, it doesn't verify if
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* the certificate is valid for the hostname which was requested.
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* This function verifies the requested hostname against certificate's subjectAltName field,
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* if that is empty, or contains no DNS entries, a fallback to the Common Name field is used.
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*
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* IP Address support is included if the request is being made to an IP address.
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*
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* @since 3.7.0
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*
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* @param stream $stream The PHP Stream which the SSL request is being made over
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* @param string $host The hostname being requested
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* @return bool If the cerficiate presented in $stream is valid for $host
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*/
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public static function verify_ssl_certificate( $stream, $host ) {
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$context_options = stream_context_get_options( $stream );
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if ( empty( $context_options['ssl']['peer_certificate'] ) ) {
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return false;
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}
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$cert = openssl_x509_parse( $context_options['ssl']['peer_certificate'] );
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if ( ! $cert ) {
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return false;
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}
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/*
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* If the request is being made to an IP address, we'll validate against IP fields
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* in the cert (if they exist)
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*/
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$host_type = ( WP_Http::is_ip_address( $host ) ? 'ip' : 'dns' );
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$certificate_hostnames = array();
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if ( ! empty( $cert['extensions']['subjectAltName'] ) ) {
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$match_against = preg_split( '/,\s*/', $cert['extensions']['subjectAltName'] );
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foreach ( $match_against as $match ) {
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list( $match_type, $match_host ) = explode( ':', $match );
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if ( $host_type == strtolower( trim( $match_type ) ) ) { // IP: or DNS:
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$certificate_hostnames[] = strtolower( trim( $match_host ) );
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}
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}
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} elseif ( ! empty( $cert['subject']['CN'] ) ) {
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// Only use the CN when the certificate includes no subjectAltName extension.
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$certificate_hostnames[] = strtolower( $cert['subject']['CN'] );
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}
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// Exact hostname/IP matches.
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if ( in_array( strtolower( $host ), $certificate_hostnames ) ) {
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return true;
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}
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// IP's can't be wildcards, Stop processing.
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if ( 'ip' == $host_type ) {
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return false;
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}
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// Test to see if the domain is at least 2 deep for wildcard support.
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if ( substr_count( $host, '.' ) < 2 ) {
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return false;
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}
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// Wildcard subdomains certs (*.example.com) are valid for a.example.com but not a.b.example.com.
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$wildcard_host = preg_replace( '/^[^.]+\./', '*.', $host );
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return in_array( strtolower( $wildcard_host ), $certificate_hostnames );
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}
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/**
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* Determines whether this class can be used for retrieving a URL.
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*
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* @since 2.7.0
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* @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().
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*
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* @param array $args Optional. Array of request arguments. Default empty array.
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* @return bool False means this class can not be used, true means it can.
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*/
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public static function test( $args = array() ) {
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if ( ! function_exists( 'stream_socket_client' ) ) {
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return false;
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}
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$is_ssl = isset( $args['ssl'] ) && $args['ssl'];
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if ( $is_ssl ) {
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if ( ! extension_loaded( 'openssl' ) ) {
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return false;
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}
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if ( ! function_exists( 'openssl_x509_parse' ) ) {
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return false;
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}
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}
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/**
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* Filters whether streams can be used as a transport for retrieving a URL.
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*
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* @since 2.7.0
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*
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* @param bool $use_class Whether the class can be used. Default true.
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* @param array $args Request arguments.
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*/
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return apply_filters( 'use_streams_transport', true, $args );
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}
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}
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/**
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* Deprecated HTTP Transport method which used fsockopen.
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*
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* This class is not used, and is included for backward compatibility only.
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* All code should make use of WP_Http directly through its API.
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*
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* @see WP_HTTP::request
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*
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* @since 2.7.0
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* @deprecated 3.7.0 Please use WP_HTTP::request() directly
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*/
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class WP_HTTP_Fsockopen extends WP_HTTP_Streams {
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// For backward compatibility for users who are using the class directly.
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}
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