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ify 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 * * @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 ( strtolower( trim( $match_type ) ) === $host_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, true ) ) { 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, true ); } /** * Determines whether this class can be used for retrieving a URL. * * @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. } Winkel - Suskes Baby & Kinderproducten