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wp-content/plugins/jetpack/vendor/automattic/jetpack-connection/legacy/class.jetpack-signature.php
vendored
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267
wp-content/plugins/jetpack/vendor/automattic/jetpack-connection/legacy/class.jetpack-signature.php
vendored
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<?php
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use \Automattic\Jetpack\Connection\Manager as Connection_Manager;
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class Jetpack_Signature {
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public $token;
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public $secret;
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public $current_request_url;
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function __construct( $access_token, $time_diff = 0 ) {
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$secret = explode( '.', $access_token );
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if ( 2 != count( $secret ) ) {
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return;
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}
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$this->token = $secret[0];
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$this->secret = $secret[1];
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$this->time_diff = $time_diff;
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}
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function sign_current_request( $override = array() ) {
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if ( isset( $override['scheme'] ) ) {
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$scheme = $override['scheme'];
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if ( ! in_array( $scheme, array( 'http', 'https' ) ) ) {
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return new WP_Error( 'invalid_scheme', 'Invalid URL scheme' );
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}
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} else {
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if ( is_ssl() ) {
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$scheme = 'https';
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} else {
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$scheme = 'http';
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}
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}
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$host_port = isset( $_SERVER['HTTP_X_FORWARDED_PORT'] ) ? $_SERVER['HTTP_X_FORWARDED_PORT'] : $_SERVER['SERVER_PORT'];
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$connection = new Connection_Manager();
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/**
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* Note: This port logic is tested in the Jetpack_Cxn_Tests->test__server_port_value() test.
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* Please update the test if any changes are made in this logic.
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*/
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if ( is_ssl() ) {
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// 443: Standard Port
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// 80: Assume we're behind a proxy without X-Forwarded-Port. Hardcoding "80" here means most sites
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// with SSL termination proxies (self-served, Cloudflare, etc.) don't need to fiddle with
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// the JETPACK_SIGNATURE__HTTPS_PORT constant. The code also implies we can't talk to a
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// site at https://example.com:80/ (which would be a strange configuration).
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// JETPACK_SIGNATURE__HTTPS_PORT: Set this constant in wp-config.php to the back end webserver's port
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// if the site is behind a proxy running on port 443 without
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// X-Forwarded-Port and the back end's port is *not* 80. It's better,
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// though, to configure the proxy to send X-Forwarded-Port.
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$https_port = defined( 'JETPACK_SIGNATURE__HTTPS_PORT' ) ? JETPACK_SIGNATURE__HTTPS_PORT : 443;
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$port = in_array( $host_port, array( 443, 80, $https_port ) ) ? '' : $host_port;
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} else {
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// 80: Standard Port
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// JETPACK_SIGNATURE__HTTPS_PORT: Set this constant in wp-config.php to the back end webserver's port
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// if the site is behind a proxy running on port 80 without
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// X-Forwarded-Port. It's better, though, to configure the proxy to
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// send X-Forwarded-Port.
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$http_port = defined( 'JETPACK_SIGNATURE__HTTP_PORT' ) ? JETPACK_SIGNATURE__HTTP_PORT : 80;
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$port = in_array( $host_port, array( 80, $http_port ) ) ? '' : $host_port;
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}
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$this->current_request_url = "{$scheme}://{$_SERVER['HTTP_HOST']}:{$port}" . stripslashes( $_SERVER['REQUEST_URI'] );
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if ( array_key_exists( 'body', $override ) && ! empty( $override['body'] ) ) {
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$body = $override['body'];
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} elseif ( 'POST' == strtoupper( $_SERVER['REQUEST_METHOD'] ) ) {
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$body = isset( $GLOBALS['HTTP_RAW_POST_DATA'] ) ? $GLOBALS['HTTP_RAW_POST_DATA'] : null;
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// Convert the $_POST to the body, if the body was empty. This is how arrays are hashed
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// and encoded on the Jetpack side.
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if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) {
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if ( empty( $body ) && is_array( $_POST ) && count( $_POST ) > 0 ) {
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$body = $_POST;
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}
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}
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} elseif ( 'PUT' == strtoupper( $_SERVER['REQUEST_METHOD'] ) ) {
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// This is a little strange-looking, but there doesn't seem to be another way to get the PUT body
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$raw_put_data = file_get_contents( 'php://input' );
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parse_str( $raw_put_data, $body );
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if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) {
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$put_data = json_decode( $raw_put_data, true );
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if ( is_array( $put_data ) && count( $put_data ) > 0 ) {
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$body = $put_data;
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}
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}
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} else {
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$body = null;
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}
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if ( empty( $body ) ) {
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$body = null;
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}
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$a = array();
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foreach ( array( 'token', 'timestamp', 'nonce', 'body-hash' ) as $parameter ) {
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if ( isset( $override[ $parameter ] ) ) {
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$a[ $parameter ] = $override[ $parameter ];
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} else {
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$a[ $parameter ] = isset( $_GET[ $parameter ] ) ? stripslashes( $_GET[ $parameter ] ) : '';
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}
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}
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$method = isset( $override['method'] ) ? $override['method'] : $_SERVER['REQUEST_METHOD'];
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return $this->sign_request( $a['token'], $a['timestamp'], $a['nonce'], $a['body-hash'], $method, $this->current_request_url, $body, true );
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}
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// body_hash v. body-hash is annoying. Refactor to accept an array?
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function sign_request( $token = '', $timestamp = 0, $nonce = '', $body_hash = '', $method = '', $url = '', $body = null, $verify_body_hash = true ) {
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if ( ! $this->secret ) {
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return new WP_Error( 'invalid_secret', 'Invalid secret' );
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}
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if ( ! $this->token ) {
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return new WP_Error( 'invalid_token', 'Invalid token' );
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}
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list( $token ) = explode( '.', $token );
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$signature_details = compact( 'token', 'timestamp', 'nonce', 'body_hash', 'method', 'url' );
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if ( 0 !== strpos( $token, "$this->token:" ) ) {
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return new WP_Error( 'token_mismatch', 'Incorrect token', compact( 'signature_details' ) );
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}
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// If we got an array at this point, let's encode it, so we can see what it looks like as a string.
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if ( is_array( $body ) ) {
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if ( count( $body ) > 0 ) {
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$body = json_encode( $body );
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} else {
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$body = '';
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}
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}
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$required_parameters = array( 'token', 'timestamp', 'nonce', 'method', 'url' );
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if ( ! is_null( $body ) ) {
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$required_parameters[] = 'body_hash';
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if ( ! is_string( $body ) ) {
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return new WP_Error( 'invalid_body', 'Body is malformed.', compact( 'signature_details' ) );
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}
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}
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foreach ( $required_parameters as $required ) {
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if ( ! is_scalar( $$required ) ) {
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return new WP_Error( 'invalid_signature', sprintf( 'The required "%s" parameter is malformed.', str_replace( '_', '-', $required ) ), compact( 'signature_details' ) );
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}
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if ( ! strlen( $$required ) ) {
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return new WP_Error( 'invalid_signature', sprintf( 'The required "%s" parameter is missing.', str_replace( '_', '-', $required ) ), compact( 'signature_details' ) );
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}
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}
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if ( empty( $body ) ) {
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if ( $body_hash ) {
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return new WP_Error( 'invalid_body_hash', 'Invalid body hash for empty body.', compact( 'signature_details' ) );
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}
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} else {
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$connection = new Connection_Manager();
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if ( $verify_body_hash && $connection->sha1_base64( $body ) !== $body_hash ) {
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return new WP_Error( 'invalid_body_hash', 'The body hash does not match.', compact( 'signature_details' ) );
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}
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}
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$parsed = parse_url( $url );
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if ( ! isset( $parsed['host'] ) ) {
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return new WP_Error( 'invalid_signature', sprintf( 'The required "%s" parameter is malformed.', 'url' ), compact( 'signature_details' ) );
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}
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if ( ! empty( $parsed['port'] ) ) {
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$port = $parsed['port'];
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} else {
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if ( 'http' == $parsed['scheme'] ) {
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$port = 80;
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} elseif ( 'https' == $parsed['scheme'] ) {
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$port = 443;
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} else {
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return new WP_Error( 'unknown_scheme_port', "The scheme's port is unknown", compact( 'signature_details' ) );
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}
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}
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if ( ! ctype_digit( "$timestamp" ) || 10 < strlen( $timestamp ) ) { // If Jetpack is around in 275 years, you can blame mdawaffe for the bug.
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return new WP_Error( 'invalid_signature', sprintf( 'The required "%s" parameter is malformed.', 'timestamp' ), compact( 'signature_details' ) );
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}
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$local_time = $timestamp - $this->time_diff;
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if ( $local_time < time() - 600 || $local_time > time() + 300 ) {
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return new WP_Error( 'invalid_signature', 'The timestamp is too old.', compact( 'signature_details' ) );
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}
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if ( 12 < strlen( $nonce ) || preg_match( '/[^a-zA-Z0-9]/', $nonce ) ) {
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return new WP_Error( 'invalid_signature', sprintf( 'The required "%s" parameter is malformed.', 'nonce' ), compact( 'signature_details' ) );
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}
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$normalized_request_pieces = array(
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$token,
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$timestamp,
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$nonce,
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$body_hash,
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strtoupper( $method ),
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strtolower( $parsed['host'] ),
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$port,
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$parsed['path'],
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// Normalized Query String
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);
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$normalized_request_pieces = array_merge( $normalized_request_pieces, $this->normalized_query_parameters( isset( $parsed['query'] ) ? $parsed['query'] : '' ) );
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$flat_normalized_request_pieces = array();
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foreach ( $normalized_request_pieces as $piece ) {
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if ( is_array( $piece ) ) {
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foreach ( $piece as $subpiece ) {
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$flat_normalized_request_pieces[] = $subpiece;
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}
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} else {
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$flat_normalized_request_pieces[] = $piece;
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}
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}
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$normalized_request_pieces = $flat_normalized_request_pieces;
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$normalized_request_string = join( "\n", $normalized_request_pieces ) . "\n";
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return base64_encode( hash_hmac( 'sha1', $normalized_request_string, $this->secret, true ) );
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}
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function normalized_query_parameters( $query_string ) {
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parse_str( $query_string, $array );
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if ( get_magic_quotes_gpc() ) {
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$array = stripslashes_deep( $array );
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}
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unset( $array['signature'] );
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$names = array_keys( $array );
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$values = array_values( $array );
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$names = array_map( array( $this, 'encode_3986' ), $names );
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$values = array_map( array( $this, 'encode_3986' ), $values );
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$pairs = array_map( array( $this, 'join_with_equal_sign' ), $names, $values );
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sort( $pairs );
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return $pairs;
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}
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function encode_3986( $string_or_array ) {
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if ( is_array( $string_or_array ) ) {
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return array_map( array( $this, 'encode_3986' ), $string_or_array );
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}
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$string_or_array = rawurlencode( $string_or_array );
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return str_replace( '%7E', '~', $string_or_array ); // prior to PHP 5.3, rawurlencode was RFC 1738
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}
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function join_with_equal_sign( $name, $value ) {
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if ( is_array( $value ) ) {
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$result = array();
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foreach ( $value as $array_key => $array_value ) {
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$result[] = $name . '[' . $array_key . ']' . '=' . $array_value;
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}
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return $result;
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}
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return "{$name}={$value}";
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}
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}
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