550 lines
17 KiB
PHP
550 lines
17 KiB
PHP
<?php
|
|
/**
|
|
* REST API Authentication
|
|
*
|
|
* @author WooThemes
|
|
* @category API
|
|
* @package WooCommerce/API
|
|
* @since 2.6.0
|
|
*/
|
|
|
|
if ( ! defined( 'ABSPATH' ) ) {
|
|
exit;
|
|
}
|
|
|
|
class WC_REST_Authentication {
|
|
|
|
/**
|
|
* Initialize authentication actions.
|
|
*/
|
|
public function __construct() {
|
|
add_filter( 'determine_current_user', array( $this, 'authenticate' ), 15 );
|
|
add_filter( 'rest_authentication_errors', array( $this, 'check_authentication_error' ) );
|
|
add_filter( 'rest_post_dispatch', array( $this, 'send_unauthorized_headers' ), 50 );
|
|
}
|
|
|
|
/**
|
|
* Check if is request to our REST API.
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function is_request_to_rest_api() {
|
|
if ( empty( $_SERVER['REQUEST_URI'] ) ) {
|
|
return false;
|
|
}
|
|
|
|
$rest_prefix = trailingslashit( rest_get_url_prefix() );
|
|
|
|
// Check if our endpoint.
|
|
$woocommerce = ( false !== strpos( $_SERVER['REQUEST_URI'], $rest_prefix . 'wc/' ) );
|
|
|
|
// Allow third party plugins use our authentication methods.
|
|
$third_party = ( false !== strpos( $_SERVER['REQUEST_URI'], $rest_prefix . 'wc-' ) );
|
|
|
|
return apply_filters( 'woocommerce_rest_is_request_to_rest_api', $woocommerce || $third_party );
|
|
}
|
|
|
|
/**
|
|
* Authenticate user.
|
|
*
|
|
* @param int|false $user_id User ID if one has been determined, false otherwise.
|
|
* @return int|false
|
|
*/
|
|
public function authenticate( $user_id ) {
|
|
// Do not authenticate twice and check if is a request to our endpoint in the WP REST API.
|
|
if ( ! empty( $user_id ) || ! $this->is_request_to_rest_api() ) {
|
|
return $user_id;
|
|
}
|
|
|
|
if ( is_ssl() ) {
|
|
return $this->perform_basic_authentication();
|
|
} else {
|
|
return $this->perform_oauth_authentication();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check for authentication error.
|
|
*
|
|
* @param WP_Error|null|bool $error
|
|
* @return WP_Error|null|bool
|
|
*/
|
|
public function check_authentication_error( $error ) {
|
|
global $wc_rest_authentication_error;
|
|
|
|
// Passthrough other errors.
|
|
if ( ! empty( $error ) ) {
|
|
return $error;
|
|
}
|
|
|
|
return $wc_rest_authentication_error;
|
|
}
|
|
|
|
/**
|
|
* Basic Authentication.
|
|
*
|
|
* SSL-encrypted requests are not subject to sniffing or man-in-the-middle
|
|
* attacks, so the request can be authenticated by simply looking up the user
|
|
* associated with the given consumer key and confirming the consumer secret
|
|
* provided is valid.
|
|
*
|
|
* @return int|bool
|
|
*/
|
|
private function perform_basic_authentication() {
|
|
global $wc_rest_authentication_error;
|
|
|
|
$consumer_key = '';
|
|
$consumer_secret = '';
|
|
|
|
// If the $_GET parameters are present, use those first.
|
|
if ( ! empty( $_GET['consumer_key'] ) && ! empty( $_GET['consumer_secret'] ) ) {
|
|
$consumer_key = $_GET['consumer_key'];
|
|
$consumer_secret = $_GET['consumer_secret'];
|
|
}
|
|
|
|
// If the above is not present, we will do full basic auth.
|
|
if ( ! $consumer_key && ! empty( $_SERVER['PHP_AUTH_USER'] ) && ! empty( $_SERVER['PHP_AUTH_PW'] ) ) {
|
|
$consumer_key = $_SERVER['PHP_AUTH_USER'];
|
|
$consumer_secret = $_SERVER['PHP_AUTH_PW'];
|
|
}
|
|
|
|
// Stop if don't have any key.
|
|
if ( ! $consumer_key || ! $consumer_secret ) {
|
|
return false;
|
|
}
|
|
|
|
// Get user data.
|
|
$user = $this->get_user_data_by_consumer_key( $consumer_key );
|
|
if ( empty( $user ) ) {
|
|
return false;
|
|
}
|
|
|
|
// Validate user secret.
|
|
if ( ! hash_equals( $user->consumer_secret, $consumer_secret ) ) {
|
|
$wc_rest_authentication_error = new WP_Error( 'woocommerce_rest_authentication_error', __( 'Consumer secret is invalid.', 'woocommerce' ), array( 'status' => 401 ) );
|
|
|
|
return false;
|
|
}
|
|
|
|
// Check API Key permissions.
|
|
if ( ! $this->check_permissions( $user->permissions ) ) {
|
|
return false;
|
|
}
|
|
|
|
// Update last access.
|
|
$this->update_last_access( $user->key_id );
|
|
|
|
return $user->user_id;
|
|
}
|
|
|
|
/**
|
|
* Parse the Authorization header into parameters.
|
|
*
|
|
* @since 2.7.0
|
|
*
|
|
* @param string $header Authorization header value (not including "Authorization: " prefix).
|
|
*
|
|
* @return array Map of parameter values.
|
|
*/
|
|
public function parse_header( $header ) {
|
|
if ( 'OAuth ' !== substr( $header, 0, 6 ) ) {
|
|
return array();
|
|
}
|
|
|
|
// From OAuth PHP library, used under MIT license.
|
|
$params = array();
|
|
if ( preg_match_all( '/(oauth_[a-z_-]*)=(:?"([^"]*)"|([^,]*))/', $header, $matches ) ) {
|
|
foreach ( $matches[1] as $i => $h ) {
|
|
$params[ $h ] = urldecode( empty( $matches[3][ $i ] ) ? $matches[4][ $i ] : $matches[3][ $i ] );
|
|
}
|
|
if ( isset( $params['realm'] ) ) {
|
|
unset( $params['realm'] );
|
|
}
|
|
}
|
|
|
|
return $params;
|
|
}
|
|
|
|
/**
|
|
* Get the authorization header.
|
|
*
|
|
* On certain systems and configurations, the Authorization header will be
|
|
* stripped out by the server or PHP. Typically this is then used to
|
|
* generate `PHP_AUTH_USER`/`PHP_AUTH_PASS` but not passed on. We use
|
|
* `getallheaders` here to try and grab it out instead.
|
|
*
|
|
* @since 2.7.0
|
|
*
|
|
* @return string Authorization header if set.
|
|
*/
|
|
public function get_authorization_header() {
|
|
if ( ! empty( $_SERVER['HTTP_AUTHORIZATION'] ) ) {
|
|
return wp_unslash( $_SERVER['HTTP_AUTHORIZATION'] );
|
|
}
|
|
|
|
if ( function_exists( 'getallheaders' ) ) {
|
|
$headers = getallheaders();
|
|
// Check for the authoization header case-insensitively.
|
|
foreach ( $headers as $key => $value ) {
|
|
if ( 'authorization' === strtolower( $key ) ) {
|
|
return $value;
|
|
}
|
|
}
|
|
}
|
|
|
|
return '';
|
|
}
|
|
|
|
/**
|
|
* Get oAuth parameters from $_GET, $_POST or request header.
|
|
*
|
|
* @since 2.7.0
|
|
*
|
|
* @return array|WP_Error
|
|
*/
|
|
public function get_oauth_parameters() {
|
|
global $wc_rest_authentication_error;
|
|
|
|
$params = array_merge( $_GET, $_POST );
|
|
$params = wp_unslash( $params );
|
|
$header = $this->get_authorization_header();
|
|
|
|
if ( ! empty( $header ) ) {
|
|
// Trim leading spaces.
|
|
$header = trim( $header );
|
|
$header_params = $this->parse_header( $header );
|
|
|
|
if ( ! empty( $header_params ) ) {
|
|
$params = array_merge( $params, $header_params );
|
|
}
|
|
}
|
|
|
|
$param_names = array(
|
|
'oauth_consumer_key',
|
|
'oauth_timestamp',
|
|
'oauth_nonce',
|
|
'oauth_signature',
|
|
'oauth_signature_method',
|
|
);
|
|
|
|
$errors = array();
|
|
$have_one = false;
|
|
|
|
// Check for required OAuth parameters.
|
|
foreach ( $param_names as $param_name ) {
|
|
if ( empty( $params[ $param_name ] ) ) {
|
|
$errors[] = $param_name;
|
|
} else {
|
|
$have_one = true;
|
|
}
|
|
}
|
|
|
|
// All keys are missing, so we're probably not even trying to use OAuth.
|
|
if ( ! $have_one ) {
|
|
return array();
|
|
}
|
|
|
|
// If we have at least one supplied piece of data, and we have an error,
|
|
// then it's a failed authentication.
|
|
if ( ! empty( $errors ) ) {
|
|
$message = sprintf(
|
|
_n( 'Missing OAuth parameter %s', 'Missing OAuth parameters %s', count( $errors ), 'woocommerce' ),
|
|
implode( ', ', $errors )
|
|
);
|
|
|
|
$wc_rest_authentication_error = new WP_Error( 'woocommerce_rest_authentication_missing_parameter', $message, array( 'status' => 401 ) );
|
|
|
|
return array();
|
|
}
|
|
|
|
return $params;
|
|
}
|
|
|
|
/**
|
|
* Perform OAuth 1.0a "one-legged" (http://oauthbible.com/#oauth-10a-one-legged) authentication for non-SSL requests.
|
|
*
|
|
* This is required so API credentials cannot be sniffed or intercepted when making API requests over plain HTTP.
|
|
*
|
|
* This follows the spec for simple OAuth 1.0a authentication (RFC 5849) as closely as possible, with two exceptions:
|
|
*
|
|
* 1) There is no token associated with request/responses, only consumer keys/secrets are used.
|
|
*
|
|
* 2) The OAuth parameters are included as part of the request query string instead of part of the Authorization header,
|
|
* This is because there is no cross-OS function within PHP to get the raw Authorization header.
|
|
*
|
|
* @link http://tools.ietf.org/html/rfc5849 for the full spec.
|
|
*
|
|
* @return int|bool
|
|
*/
|
|
private function perform_oauth_authentication() {
|
|
global $wc_rest_authentication_error;
|
|
|
|
$params = $this->get_oauth_parameters();
|
|
if ( empty( $params ) ) {
|
|
return false;
|
|
}
|
|
|
|
// Fetch WP user by consumer key.
|
|
$user = $this->get_user_data_by_consumer_key( $params['oauth_consumer_key'] );
|
|
|
|
if ( empty( $user ) ) {
|
|
$wc_rest_authentication_error = new WP_Error( 'woocommerce_rest_authentication_error', __( 'Consumer key is invalid.', 'woocommerce' ), array( 'status' => 401 ) );
|
|
|
|
return false;
|
|
}
|
|
|
|
// Perform OAuth validation.
|
|
$wc_rest_authentication_error = $this->check_oauth_signature( $user, $params );
|
|
if ( is_wp_error( $wc_rest_authentication_error ) ) {
|
|
return false;
|
|
}
|
|
|
|
$wc_rest_authentication_error = $this->check_oauth_timestamp_and_nonce( $user, $params['oauth_timestamp'], $params['oauth_nonce'] );
|
|
if ( is_wp_error( $wc_rest_authentication_error ) ) {
|
|
return false;
|
|
}
|
|
|
|
// Check API Key permissions.
|
|
if ( ! $this->check_permissions( $user->permissions ) ) {
|
|
return false;
|
|
}
|
|
|
|
// Update last access.
|
|
$this->update_last_access( $user->key_id );
|
|
|
|
return $user->user_id;
|
|
}
|
|
|
|
/**
|
|
* Verify that the consumer-provided request signature matches our generated signature,
|
|
* this ensures the consumer has a valid key/secret.
|
|
*
|
|
* @param stdClass $user
|
|
* @param array $params The request parameters.
|
|
* @return null|WP_Error
|
|
*/
|
|
private function check_oauth_signature( $user, $params ) {
|
|
$http_method = strtoupper( $_SERVER['REQUEST_METHOD'] );
|
|
$request_path = parse_url( $_SERVER['REQUEST_URI'], PHP_URL_PATH );
|
|
$wp_base = get_home_url( null, '/', 'relative' );
|
|
if ( substr( $request_path, 0, strlen( $wp_base ) ) === $wp_base ) {
|
|
$request_path = substr( $request_path, strlen( $wp_base ) );
|
|
}
|
|
$base_request_uri = rawurlencode( get_home_url( null, $request_path ) );
|
|
|
|
// Get the signature provided by the consumer and remove it from the parameters prior to checking the signature.
|
|
$consumer_signature = rawurldecode( $params['oauth_signature'] );
|
|
unset( $params['oauth_signature'] );
|
|
|
|
// Sort parameters.
|
|
if ( ! uksort( $params, 'strcmp' ) ) {
|
|
return new WP_Error( 'woocommerce_rest_authentication_error', __( 'Invalid signature - failed to sort parameters.', 'woocommerce' ), array( 'status' => 401 ) );
|
|
}
|
|
|
|
// Normalize parameter key/values.
|
|
$params = $this->normalize_parameters( $params );
|
|
$query_parameters = array();
|
|
foreach ( $params as $param_key => $param_value ) {
|
|
if ( is_array( $param_value ) ) {
|
|
foreach ( $param_value as $param_key_inner => $param_value_inner ) {
|
|
$query_parameters[] = $param_key . '%255B' . $param_key_inner . '%255D%3D' . $param_value_inner;
|
|
}
|
|
} else {
|
|
$query_parameters[] = $param_key . '%3D' . $param_value; // Join with equals sign.
|
|
}
|
|
}
|
|
$query_string = implode( '%26', $query_parameters ); // Join with ampersand.
|
|
$string_to_sign = $http_method . '&' . $base_request_uri . '&' . $query_string;
|
|
|
|
if ( 'HMAC-SHA1' !== $params['oauth_signature_method'] && 'HMAC-SHA256' !== $params['oauth_signature_method'] ) {
|
|
return new WP_Error( 'woocommerce_rest_authentication_error', __( 'Invalid signature - signature method is invalid.', 'woocommerce' ), array( 'status' => 401 ) );
|
|
}
|
|
|
|
$hash_algorithm = strtolower( str_replace( 'HMAC-', '', $params['oauth_signature_method'] ) );
|
|
$secret = $user->consumer_secret . '&';
|
|
$signature = base64_encode( hash_hmac( $hash_algorithm, $string_to_sign, $secret, true ) );
|
|
|
|
if ( ! hash_equals( $signature, $consumer_signature ) ) {
|
|
return new WP_Error( 'woocommerce_rest_authentication_error', __( 'Invalid signature - provided signature does not match.', 'woocommerce' ), array( 'status' => 401 ) );
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Normalize each parameter by assuming each parameter may have already been
|
|
* encoded, so attempt to decode, and then re-encode according to RFC 3986.
|
|
*
|
|
* Note both the key and value is normalized so a filter param like:
|
|
*
|
|
* 'filter[period]' => 'week'
|
|
*
|
|
* is encoded to:
|
|
*
|
|
* 'filter%5Bperiod%5D' => 'week'
|
|
*
|
|
* This conforms to the OAuth 1.0a spec which indicates the entire query string
|
|
* should be URL encoded.
|
|
*
|
|
* @see rawurlencode()
|
|
* @param array $parameters Un-normalized pararmeters.
|
|
* @return array Normalized parameters.
|
|
*/
|
|
private function normalize_parameters( $parameters ) {
|
|
$keys = wc_rest_urlencode_rfc3986( array_keys( $parameters ) );
|
|
$values = wc_rest_urlencode_rfc3986( array_values( $parameters ) );
|
|
$parameters = array_combine( $keys, $values );
|
|
|
|
return $parameters;
|
|
}
|
|
|
|
/**
|
|
* Verify that the timestamp and nonce provided with the request are valid. This prevents replay attacks where
|
|
* an attacker could attempt to re-send an intercepted request at a later time.
|
|
*
|
|
* - A timestamp is valid if it is within 15 minutes of now.
|
|
* - A nonce is valid if it has not been used within the last 15 minutes.
|
|
*
|
|
* @param stdClass $user
|
|
* @param int $timestamp the unix timestamp for when the request was made
|
|
* @param string $nonce a unique (for the given user) 32 alphanumeric string, consumer-generated
|
|
* @return bool|WP_Error
|
|
*/
|
|
private function check_oauth_timestamp_and_nonce( $user, $timestamp, $nonce ) {
|
|
global $wpdb;
|
|
|
|
$valid_window = 15 * 60; // 15 minute window.
|
|
|
|
if ( ( $timestamp < time() - $valid_window ) || ( $timestamp > time() + $valid_window ) ) {
|
|
return new WP_Error( 'woocommerce_rest_authentication_error', __( 'Invalid timestamp.', 'woocommerce' ), array( 'status' => 401 ) );
|
|
}
|
|
|
|
$used_nonces = maybe_unserialize( $user->nonces );
|
|
|
|
if ( empty( $used_nonces ) ) {
|
|
$used_nonces = array();
|
|
}
|
|
|
|
if ( in_array( $nonce, $used_nonces ) ) {
|
|
return new WP_Error( 'woocommerce_rest_authentication_error', __( 'Invalid nonce - nonce has already been used.', 'woocommerce' ), array( 'status' => 401 ) );
|
|
}
|
|
|
|
$used_nonces[ $timestamp ] = $nonce;
|
|
|
|
// Remove expired nonces.
|
|
foreach ( $used_nonces as $nonce_timestamp => $nonce ) {
|
|
if ( $nonce_timestamp < ( time() - $valid_window ) ) {
|
|
unset( $used_nonces[ $nonce_timestamp ] );
|
|
}
|
|
}
|
|
|
|
$used_nonces = maybe_serialize( $used_nonces );
|
|
|
|
$wpdb->update(
|
|
$wpdb->prefix . 'woocommerce_api_keys',
|
|
array( 'nonces' => $used_nonces ),
|
|
array( 'key_id' => $user->key_id ),
|
|
array( '%s' ),
|
|
array( '%d' )
|
|
);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Return the user data for the given consumer_key.
|
|
*
|
|
* @param string $consumer_key
|
|
* @return array
|
|
*/
|
|
private function get_user_data_by_consumer_key( $consumer_key ) {
|
|
global $wpdb;
|
|
|
|
$consumer_key = wc_api_hash( sanitize_text_field( $consumer_key ) );
|
|
$user = $wpdb->get_row( $wpdb->prepare( "
|
|
SELECT key_id, user_id, permissions, consumer_key, consumer_secret, nonces
|
|
FROM {$wpdb->prefix}woocommerce_api_keys
|
|
WHERE consumer_key = %s
|
|
", $consumer_key ) );
|
|
|
|
return $user;
|
|
}
|
|
|
|
/**
|
|
* Check that the API keys provided have the proper key-specific permissions to either read or write API resources.
|
|
*
|
|
* @param string $permissions
|
|
* @return bool
|
|
*/
|
|
private function check_permissions( $permissions ) {
|
|
global $wc_rest_authentication_error;
|
|
|
|
$valid = true;
|
|
|
|
if ( ! isset( $_SERVER['REQUEST_METHOD'] ) ) {
|
|
return false;
|
|
}
|
|
|
|
switch ( $_SERVER['REQUEST_METHOD'] ) {
|
|
|
|
case 'HEAD' :
|
|
case 'GET' :
|
|
if ( 'read' !== $permissions && 'read_write' !== $permissions ) {
|
|
$wc_rest_authentication_error = new WP_Error( 'woocommerce_rest_authentication_error', __( 'The API key provided does not have read permissions.', 'woocommerce' ), array( 'status' => 401 ) );
|
|
$valid = false;
|
|
}
|
|
break;
|
|
|
|
case 'POST' :
|
|
case 'PUT' :
|
|
case 'PATCH' :
|
|
case 'DELETE' :
|
|
if ( 'write' !== $permissions && 'read_write' !== $permissions ) {
|
|
$wc_rest_authentication_error = new WP_Error( 'woocommerce_rest_authentication_error', __( 'The API key provided does not have write permissions.', 'woocommerce' ), array( 'status' => 401 ) );
|
|
$valid = false;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return $valid;
|
|
}
|
|
|
|
/**
|
|
* Updated API Key last access datetime.
|
|
*
|
|
* @param int $key_id
|
|
*/
|
|
private function update_last_access( $key_id ) {
|
|
global $wpdb;
|
|
|
|
$wpdb->update(
|
|
$wpdb->prefix . 'woocommerce_api_keys',
|
|
array( 'last_access' => current_time( 'mysql' ) ),
|
|
array( 'key_id' => $key_id ),
|
|
array( '%s' ),
|
|
array( '%d' )
|
|
);
|
|
}
|
|
|
|
/**
|
|
* If the consumer_key and consumer_secret $_GET parameters are NOT provided
|
|
* and the Basic auth headers are either not present or the consumer secret does not match the consumer
|
|
* key provided, then return the correct Basic headers and an error message.
|
|
*
|
|
* @param WP_REST_Response $response Current response being served.
|
|
* @return WP_REST_Response
|
|
*/
|
|
public function send_unauthorized_headers( $response ) {
|
|
global $wc_rest_authentication_error;
|
|
|
|
if ( is_wp_error( $wc_rest_authentication_error ) && is_ssl() ) {
|
|
$auth_message = __( 'WooCommerce API. Use a consumer key in the username field and a consumer secret in the password field.', 'woocommerce' );
|
|
$response->header( 'WWW-Authenticate', 'Basic realm="' . $auth_message . '"', true );
|
|
}
|
|
|
|
return $response;
|
|
}
|
|
}
|
|
|
|
new WC_REST_Authentication();
|