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class.jetpack-client.php (1 issue)

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<?php
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class Jetpack_Client {
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	const WPCOM_JSON_API_VERSION = '1.1';
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	/**
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	 * Makes an authorized remote request using Jetpack_Signature
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	 *
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	 * @return array|WP_Error WP HTTP response on success
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	 */
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	public static function remote_request( $args, $body = null ) {
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		$defaults = array(
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			'url' => '',
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			'user_id' => 0,
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			'blog_id' => 0,
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			'auth_location' => JETPACK_CLIENT__AUTH_LOCATION,
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			'method' => 'POST',
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			'timeout' => 10,
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			'redirection' => 0,
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			'headers' => array(),
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			'stream' => false,
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			'filename' => null,
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			'sslverify' => true,
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		);
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		$args = wp_parse_args( $args, $defaults );
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		$args['blog_id'] = (int) $args['blog_id'];
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		if ( 'header' != $args['auth_location'] ) {
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			$args['auth_location'] = 'query_string';
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		}
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		$token = Jetpack_Data::get_access_token( $args['user_id'] );
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		if ( !$token ) {
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			return new Jetpack_Error( 'missing_token' );
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		}
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		$method = strtoupper( $args['method'] );
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		$timeout = intval( $args['timeout'] );
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		$redirection = $args['redirection'];
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		$stream = $args['stream'];
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		$filename = $args['filename'];
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		$sslverify = $args['sslverify'];
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		$request = compact( 'method', 'body', 'timeout', 'redirection', 'stream', 'filename', 'sslverify' );
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		@list( $token_key, $secret ) = explode( '.', $token->secret );
0 ignored issues
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Security Best Practice introduced by
It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended.

If you suppress an error, we recommend checking for the error condition explicitly:

// For example instead of
@mkdir($dir);

// Better use
if (@mkdir($dir) === false) {
    throw new \RuntimeException('The directory '.$dir.' could not be created.');
}
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		if ( empty( $token ) || empty( $secret ) ) {
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			return new Jetpack_Error( 'malformed_token' );
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		}
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		$token_key = sprintf( '%s:%d:%d', $token_key, JETPACK__API_VERSION, $token->external_user_id );
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		require_once JETPACK__PLUGIN_DIR . 'class.jetpack-signature.php';
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		$time_diff = (int) Jetpack_Options::get_option( 'time_diff' );
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		$jetpack_signature = new Jetpack_Signature( $token->secret, $time_diff );
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		$timestamp = time() + $time_diff;
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		if( function_exists( 'wp_generate_password' ) ) {
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			$nonce = wp_generate_password( 10, false );
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		} else {
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			$nonce = substr( sha1( rand( 0, 1000000 ) ), 0, 10);
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		}
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		// Kind of annoying.  Maybe refactor Jetpack_Signature to handle body-hashing
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		if ( is_null( $body ) ) {
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			$body_hash = '';
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		} else {
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			// Allow arrays to be used in passing data.
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			$body_to_hash = $body;
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			if ( is_array( $body ) ) {
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				// We cast this to a new variable, because the array form of $body needs to be
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				// maintained so it can be passed into the request later on in the code.
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				if ( count( $body ) > 0 ) {
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					$body_to_hash = json_encode( self::_stringify_data( $body ) );
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				} else {
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					$body_to_hash = '';
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				}
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			}
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			if ( ! is_string( $body_to_hash ) ) {
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				return new Jetpack_Error( 'invalid_body', 'Body is malformed.' );
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			}
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			$body_hash = jetpack_sha1_base64( $body_to_hash );
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		}
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		$auth = array(
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			'token' => $token_key,
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			'timestamp' => $timestamp,
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			'nonce' => $nonce,
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			'body-hash' => $body_hash,
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		);
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		if ( false !== strpos( $args['url'], 'xmlrpc.php' ) ) {
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			$url_args = array(
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				'for'           => 'jetpack',
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				'wpcom_blog_id' => Jetpack_Options::get_option( 'id' ),
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			);
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		} else {
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			$url_args = array();
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		}
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		if ( 'header' != $args['auth_location'] ) {
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			$url_args += $auth;
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		}
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		$url = add_query_arg( urlencode_deep( $url_args ), $args['url'] );
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		$url = Jetpack::fix_url_for_bad_hosts( $url );
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		$signature = $jetpack_signature->sign_request( $token_key, $timestamp, $nonce, $body_hash, $method, $url, $body, false );
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		if ( !$signature || is_wp_error( $signature ) ) {
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			return $signature;
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		}
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		// Send an Authorization header so various caches/proxies do the right thing
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		$auth['signature'] = $signature;
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		$auth['version'] = JETPACK__VERSION;
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		$header_pieces = array();
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		foreach ( $auth as $key => $value ) {
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			$header_pieces[] = sprintf( '%s="%s"', $key, $value );
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		}
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		$request['headers'] = array_merge( $args['headers'], array(
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			'Authorization' => "X_JETPACK " . join( ' ', $header_pieces ),
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		) );
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		$host = parse_url( $url, PHP_URL_HOST );
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		// If we have a JETPACK__WPCOM_JSON_API_HOST_HEADER set, then let's use
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		// that, otherwise, let's fallback to the standard.
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		if ( defined( 'JETPACK__WPCOM_JSON_API_HOST_HEADER' ) && JETPACK__WPCOM_JSON_API_HOST_HEADER ) {
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			$request['headers']['Host'] = JETPACK__WPCOM_JSON_API_HOST_HEADER;
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		} elseif ( $host === JETPACK__WPCOM_JSON_API_HOST ) {
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			$request['headers']['Host'] = 'public-api.wordpress.com';
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		}
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		if ( 'header' != $args['auth_location'] ) {
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			$url = add_query_arg( 'signature', urlencode( $signature ), $url );
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		}
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		return Jetpack_Client::_wp_remote_request( $url, $request );
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	}
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	/**
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	 * Wrapper for wp_remote_request().  Turns off SSL verification for certain SSL errors.
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	 * This is lame, but many, many, many hosts have misconfigured SSL.
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	 *
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	 * When Jetpack is registered, the jetpack_fallback_no_verify_ssl_certs option is set to the current time if:
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	 * 1. a certificate error is found AND
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	 * 2. not verifying the certificate works around the problem.
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	 *
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	 * The option is checked on each request.
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	 *
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	 * @internal
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	 * @see Jetpack::fix_url_for_bad_hosts()
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	 *
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	 * @return array|WP_Error WP HTTP response on success
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	 */
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	public static function _wp_remote_request( $url, $args, $set_fallback = false ) {
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		/**
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		 * SSL verification (`sslverify`) for the JetpackClient remote request
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		 * defaults to off, use this filter to force it on.
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		 *
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		 * Return `true` to ENABLE SSL verification, return `false`
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		 * to DISABLE SSL verification.
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		 *
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		 * @since 3.6.0
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		 *
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		 * @param bool Whether to force `sslverify` or not.
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		 */
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		if ( apply_filters( 'jetpack_client_verify_ssl_certs', false ) ) {
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			return wp_remote_request( $url, $args );
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		}
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		$fallback = Jetpack_Options::get_option( 'fallback_no_verify_ssl_certs' );
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		if ( false === $fallback ) {
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			Jetpack_Options::update_option( 'fallback_no_verify_ssl_certs', 0 );
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		}
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		if ( (int) $fallback ) {
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			// We're flagged to fallback
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			$args['sslverify'] = false;
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		}
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		$response = wp_remote_request( $url, $args );
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		if (
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			!$set_fallback                                     // We're not allowed to set the flag on this request, so whatever happens happens
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		||
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			isset( $args['sslverify'] ) && !$args['sslverify'] // No verification - no point in doing it again
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		||
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			!is_wp_error( $response )                          // Let it ride
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		) {
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			Jetpack_Client::set_time_diff( $response, $set_fallback );
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			return $response;
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		}
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		// At this point, we're not flagged to fallback and we are allowed to set the flag on this request.
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		$message = $response->get_error_message();
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		// Is it an SSL Certificate verification error?
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		if (
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			false === strpos( $message, '14090086' ) // OpenSSL SSL3 certificate error
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		&&
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			false === strpos( $message, '1407E086' ) // OpenSSL SSL2 certificate error
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		&&
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			false === strpos( $message, 'error setting certificate verify locations' ) // cURL CA bundle not found
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		&&
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			false === strpos( $message, 'Peer certificate cannot be authenticated with' ) // cURL CURLE_SSL_CACERT: CA bundle found, but not helpful
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			                                                                              // different versions of curl have different error messages
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			                                                                              // this string should catch them all
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		&&
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			false === strpos( $message, 'Problem with the SSL CA cert' ) // cURL CURLE_SSL_CACERT_BADFILE: probably access rights
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		) {
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			// No, it is not.
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			return $response;
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		}
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		// Redo the request without SSL certificate verification.
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		$args['sslverify'] = false;
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		$response = wp_remote_request( $url, $args );
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		if ( !is_wp_error( $response ) ) {
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			// The request went through this time, flag for future fallbacks
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			Jetpack_Options::update_option( 'fallback_no_verify_ssl_certs', time() );
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			Jetpack_Client::set_time_diff( $response, $set_fallback );
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		}
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		return $response;
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	}
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	public static function set_time_diff( &$response, $force_set = false ) {
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		$code = wp_remote_retrieve_response_code( $response );
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		// Only trust the Date header on some responses
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		if ( 200 != $code && 304 != $code && 400 != $code && 401 != $code ) {
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			return;
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		}
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		if ( !$date = wp_remote_retrieve_header( $response, 'date' ) ) {
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			return;
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		}
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		if ( 0 >= $time = (int) strtotime( $date ) ) {
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			return;
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		}
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		$time_diff = $time - time();
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		if ( $force_set ) { // during register
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			Jetpack_Options::update_option( 'time_diff', $time_diff );
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		} else { // otherwise
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			$old_diff = Jetpack_Options::get_option( 'time_diff' );
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			if ( false === $old_diff || abs( $time_diff - (int) $old_diff ) > 10 ) {
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				Jetpack_Options::update_option( 'time_diff', $time_diff );
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			}
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		}
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	}
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	/**
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	 * Query the WordPress.com REST API using the blog token
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	 *
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	 * @param string  $path
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	 * @param string  $version
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	 * @param array   $args
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	 * @param string  $body
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	 * @return array|WP_Error $response Data.
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	 */
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	static function wpcom_json_api_request_as_blog( $path, $version = self::WPCOM_JSON_API_VERSION, $args = array(), $body = null ) {
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		$filtered_args = array_intersect_key( $args, array(
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			'method'      => 'string',
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			'timeout'     => 'int',
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			'redirection' => 'int',
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			'stream'      => 'boolean',
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			'filename'    => 'string',
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			'sslverify'   => 'boolean',
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		) );
288
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		/**
290
		 * Determines whether Jetpack can send outbound https requests to the WPCOM api.
291
		 *
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		 * @since 3.6.0
293
		 *
294
		 * @param bool $proto Defaults to true.
295
		 */
296
		$proto = apply_filters( 'jetpack_can_make_outbound_https', true ) ? 'https' : 'http';
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		// unprecedingslashit
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		$_path = preg_replace( '/^\//', '', $path );
300
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		// Use GET by default whereas `remote_request` uses POST
302
		$request_method = ( isset( $filtered_args['method'] ) ) ? $filtered_args['method'] : 'GET';
303
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		$validated_args = array_merge( $filtered_args, array(
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			'url'     => sprintf( '%s://%s/rest/v%s/%s', $proto, JETPACK__WPCOM_JSON_API_HOST, $version, $_path ),
306
			'blog_id' => (int) Jetpack_Options::get_option( 'id' ),
307
			'method'  => $request_method,
308
		) );
309
310
		return Jetpack_Client::remote_request( $validated_args, $body );
311
	}
312
313
	/**
314
	 * Takes an array or similar structure and recursively turns all values into strings. This is used to
315
	 * make sure that body hashes are made ith the string version, which is what will be seen after a
316
	 * server pulls up the data in the $_POST array.
317
	 *
318
	 * @param array|mixed $data
319
	 *
320
	 * @return array|string
321
	 */
322
	public static function _stringify_data( $data ) {
323
324
		// Booleans are special, lets just makes them and explicit 1/0 instead of the 0 being an empty string.
325
		if ( is_bool( $data ) ) {
326
			return $data ? "1" : "0";
327
		}
328
329
		// Cast objects into arrays.
330
		if ( is_object( $data ) ) {
331
			$data = (array) $data;
332
		}
333
334
		// Non arrays at this point should be just converted to strings.
335
		if ( ! is_array( $data ) ) {
336
			return (string)$data;
337
		}
338
339
		foreach ( $data as $key => &$value ) {
340
			$value = self::_stringify_data( $value );
341
		}
342
343
		return $data;
344
	}
345
}
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