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<?php
/**
* 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 ( $is_local ) {
/**
* Filters whether SSL should be verified for local requests.
*
* @since 2.8.0
* @since 5.1.0 The `$url` parameter was added.
*
* @param bool $ssl_verify Whether to verify the SSL connection. Default true.
* @param string $url The request URL.
*/
$ssl_verify = apply_filters( 'https_local_ssl_verify', $ssl_verify, $url );
} elseif ( ! $is_local ) {
/** This filter is documented in site-inc/class-http.php */
$ssl_verify = apply_filters( 'https_ssl_verify', $ssl_verify, $url );
}
$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
*
* @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.
*
* @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.
}
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