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