411 lines
12 KiB
PHP
411 lines
12 KiB
PHP
<?php
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/**
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* WooCommerce API Authentication Class
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*
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* @author WooThemes
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* @category API
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* @package WooCommerce/API
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* @since 2.1.0
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* @version 2.4.0
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*/
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if ( ! defined( 'ABSPATH' ) ) {
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exit; // Exit if accessed directly
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}
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class WC_API_Authentication {
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/**
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* Setup class
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*
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* @since 2.1
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*/
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public function __construct() {
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// To disable authentication, hook into this filter at a later priority and return a valid WP_User
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add_filter( 'woocommerce_api_check_authentication', array( $this, 'authenticate' ), 0 );
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}
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/**
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* Authenticate the request. The authentication method varies based on whether the request was made over SSL or not.
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*
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* @since 2.1
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* @param WP_User $user
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* @return null|WP_Error|WP_User
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*/
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public function authenticate( $user ) {
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// Allow access to the index by default
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if ( '/' === WC()->api->server->path ) {
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return new WP_User( 0 );
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}
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try {
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if ( is_ssl() ) {
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$keys = $this->perform_ssl_authentication();
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} else {
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$keys = $this->perform_oauth_authentication();
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}
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// Check API key-specific permission
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$this->check_api_key_permissions( $keys['permissions'] );
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$user = $this->get_user_by_id( $keys['user_id'] );
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$this->update_api_key_last_access( $keys['key_id'] );
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} catch ( Exception $e ) {
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$user = new WP_Error( 'woocommerce_api_authentication_error', $e->getMessage(), array( 'status' => $e->getCode() ) );
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}
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return $user;
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}
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/**
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* SSL-encrypted requests are not subject to sniffing or man-in-the-middle
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* attacks, so the request can be authenticated by simply looking up the user
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* associated with the given consumer key and confirming the consumer secret
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* provided is valid
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*
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* @since 2.1
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* @return array
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* @throws Exception
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*/
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private function perform_ssl_authentication() {
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$params = WC()->api->server->params['GET'];
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// Get consumer key
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if ( ! empty( $_SERVER['PHP_AUTH_USER'] ) ) {
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// Should be in HTTP Auth header by default
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$consumer_key = $_SERVER['PHP_AUTH_USER'];
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} elseif ( ! empty( $params['consumer_key'] ) ) {
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// Allow a query string parameter as a fallback
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$consumer_key = $params['consumer_key'];
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} else {
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throw new Exception( __( 'Consumer key is missing.', 'woocommerce' ), 404 );
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}
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// Get consumer secret
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if ( ! empty( $_SERVER['PHP_AUTH_PW'] ) ) {
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// Should be in HTTP Auth header by default
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$consumer_secret = $_SERVER['PHP_AUTH_PW'];
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} elseif ( ! empty( $params['consumer_secret'] ) ) {
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// Allow a query string parameter as a fallback
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$consumer_secret = $params['consumer_secret'];
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} else {
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throw new Exception( __( 'Consumer secret is missing.', 'woocommerce' ), 404 );
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}
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$keys = $this->get_keys_by_consumer_key( $consumer_key );
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if ( ! $this->is_consumer_secret_valid( $keys['consumer_secret'], $consumer_secret ) ) {
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throw new Exception( __( 'Consumer secret is invalid.', 'woocommerce' ), 401 );
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}
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return $keys;
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}
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/**
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* Perform OAuth 1.0a "one-legged" (http://oauthbible.com/#oauth-10a-one-legged) authentication for non-SSL requests
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*
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* This is required so API credentials cannot be sniffed or intercepted when making API requests over plain HTTP
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*
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* This follows the spec for simple OAuth 1.0a authentication (RFC 5849) as closely as possible, with two exceptions:
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*
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* 1) There is no token associated with request/responses, only consumer keys/secrets are used
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*
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* 2) The OAuth parameters are included as part of the request query string instead of part of the Authorization header,
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* This is because there is no cross-OS function within PHP to get the raw Authorization header
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*
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* @link http://tools.ietf.org/html/rfc5849 for the full spec
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* @since 2.1
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* @return array
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* @throws Exception
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*/
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private function perform_oauth_authentication() {
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$params = WC()->api->server->params['GET'];
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$param_names = array( 'oauth_consumer_key', 'oauth_timestamp', 'oauth_nonce', 'oauth_signature', 'oauth_signature_method' );
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// Check for required OAuth parameters
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foreach ( $param_names as $param_name ) {
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if ( empty( $params[ $param_name ] ) ) {
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/* translators: %s: parameter name */
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throw new Exception( sprintf( __( '%s parameter is missing', 'woocommerce' ), $param_name ), 404 );
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}
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}
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// Fetch WP user by consumer key
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$keys = $this->get_keys_by_consumer_key( $params['oauth_consumer_key'] );
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// Perform OAuth validation
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$this->check_oauth_signature( $keys, $params );
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$this->check_oauth_timestamp_and_nonce( $keys, $params['oauth_timestamp'], $params['oauth_nonce'] );
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// Authentication successful, return user
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return $keys;
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}
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/**
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* Return the keys for the given consumer key
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*
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* @since 2.4.0
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* @param string $consumer_key
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* @return array
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* @throws Exception
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*/
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private function get_keys_by_consumer_key( $consumer_key ) {
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global $wpdb;
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$consumer_key = wc_api_hash( sanitize_text_field( $consumer_key ) );
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$keys = $wpdb->get_row( $wpdb->prepare( "
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SELECT key_id, user_id, permissions, consumer_key, consumer_secret, nonces
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FROM {$wpdb->prefix}woocommerce_api_keys
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WHERE consumer_key = '%s'
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", $consumer_key ), ARRAY_A );
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if ( empty( $keys ) ) {
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throw new Exception( __( 'Consumer key is invalid.', 'woocommerce' ), 401 );
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}
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return $keys;
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}
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/**
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* Get user by ID
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*
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* @since 2.4.0
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* @param int $user_id
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* @return WP_User
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*
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* @throws Exception
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*/
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private function get_user_by_id( $user_id ) {
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$user = get_user_by( 'id', $user_id );
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if ( ! $user ) {
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throw new Exception( __( 'API user is invalid', 'woocommerce' ), 401 );
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}
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return $user;
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}
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/**
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* Check if the consumer secret provided for the given user is valid
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*
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* @since 2.1
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* @param string $keys_consumer_secret
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* @param string $consumer_secret
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* @return bool
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*/
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private function is_consumer_secret_valid( $keys_consumer_secret, $consumer_secret ) {
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return hash_equals( $keys_consumer_secret, $consumer_secret );
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}
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/**
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* Verify that the consumer-provided request signature matches our generated signature, this ensures the consumer
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* has a valid key/secret
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*
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* @param array $keys
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* @param array $params the request parameters
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* @throws Exception
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*/
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private function check_oauth_signature( $keys, $params ) {
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$http_method = strtoupper( WC()->api->server->method );
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$base_request_uri = rawurlencode( untrailingslashit( get_woocommerce_api_url( '' ) ) . WC()->api->server->path );
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// Get the signature provided by the consumer and remove it from the parameters prior to checking the signature
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$consumer_signature = rawurldecode( str_replace( ' ', '+', $params['oauth_signature'] ) );
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unset( $params['oauth_signature'] );
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// Remove filters and convert them from array to strings to void normalize issues
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if ( isset( $params['filter'] ) ) {
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$filters = $params['filter'];
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unset( $params['filter'] );
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foreach ( $filters as $filter => $filter_value ) {
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$params[ 'filter[' . $filter . ']' ] = $filter_value;
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}
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}
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// Normalize parameter key/values
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$params = $this->normalize_parameters( $params );
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// Sort parameters
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if ( ! uksort( $params, 'strcmp' ) ) {
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throw new Exception( __( 'Invalid signature - failed to sort parameters.', 'woocommerce' ), 401 );
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}
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// Form query string
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$query_params = array();
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foreach ( $params as $param_key => $param_value ) {
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$query_params[] = $param_key . '%3D' . $param_value; // join with equals sign
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}
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$query_string = implode( '%26', $query_params ); // join with ampersand
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$string_to_sign = $http_method . '&' . $base_request_uri . '&' . $query_string;
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if ( 'HMAC-SHA1' !== $params['oauth_signature_method'] && 'HMAC-SHA256' !== $params['oauth_signature_method'] ) {
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throw new Exception( __( 'Invalid signature - signature method is invalid.', 'woocommerce' ), 401 );
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}
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$hash_algorithm = strtolower( str_replace( 'HMAC-', '', $params['oauth_signature_method'] ) );
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$signature = base64_encode( hash_hmac( $hash_algorithm, $string_to_sign, $keys['consumer_secret'], true ) );
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if ( ! hash_equals( $signature, $consumer_signature ) ) {
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throw new Exception( __( 'Invalid signature - provided signature does not match.', 'woocommerce' ), 401 );
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}
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}
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/**
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* Normalize each parameter by assuming each parameter may have already been
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* encoded, so attempt to decode, and then re-encode according to RFC 3986
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*
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* Note both the key and value is normalized so a filter param like:
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*
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* 'filter[period]' => 'week'
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*
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* is encoded to:
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*
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* 'filter%5Bperiod%5D' => 'week'
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*
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* This conforms to the OAuth 1.0a spec which indicates the entire query string
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* should be URL encoded
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*
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* @since 2.1
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* @see rawurlencode()
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* @param array $parameters un-normalized parameters
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* @return array normalized parameters
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*/
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private function normalize_parameters( $parameters ) {
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$normalized_parameters = array();
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foreach ( $parameters as $key => $value ) {
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// Percent symbols (%) must be double-encoded
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$key = str_replace( '%', '%25', rawurlencode( rawurldecode( $key ) ) );
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$value = str_replace( '%', '%25', rawurlencode( rawurldecode( $value ) ) );
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$normalized_parameters[ $key ] = $value;
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}
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return $normalized_parameters;
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}
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/**
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* Verify that the timestamp and nonce provided with the request are valid. This prevents replay attacks where
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* an attacker could attempt to re-send an intercepted request at a later time.
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*
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* - A timestamp is valid if it is within 15 minutes of now
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* - A nonce is valid if it has not been used within the last 15 minutes
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*
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* @param array $keys
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* @param int $timestamp the unix timestamp for when the request was made
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* @param string $nonce a unique (for the given user) 32 alphanumeric string, consumer-generated
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* @throws Exception
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*/
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private function check_oauth_timestamp_and_nonce( $keys, $timestamp, $nonce ) {
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global $wpdb;
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$valid_window = 15 * 60; // 15 minute window
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if ( ( $timestamp < time() - $valid_window ) || ( $timestamp > time() + $valid_window ) ) {
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throw new Exception( __( 'Invalid timestamp.', 'woocommerce' ) );
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}
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$used_nonces = maybe_unserialize( $keys['nonces'] );
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if ( empty( $used_nonces ) ) {
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$used_nonces = array();
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}
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if ( in_array( $nonce, $used_nonces ) ) {
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throw new Exception( __( 'Invalid nonce - nonce has already been used.', 'woocommerce' ), 401 );
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}
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$used_nonces[ $timestamp ] = $nonce;
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// Remove expired nonces
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foreach ( $used_nonces as $nonce_timestamp => $nonce ) {
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if ( $nonce_timestamp < ( time() - $valid_window ) ) {
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unset( $used_nonces[ $nonce_timestamp ] );
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}
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}
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$used_nonces = maybe_serialize( $used_nonces );
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$wpdb->update(
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$wpdb->prefix . 'woocommerce_api_keys',
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array( 'nonces' => $used_nonces ),
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array( 'key_id' => $keys['key_id'] ),
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array( '%s' ),
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array( '%d' )
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);
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}
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/**
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* Check that the API keys provided have the proper key-specific permissions to either read or write API resources
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*
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* @param string $key_permissions
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* @throws Exception if the permission check fails
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*/
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public function check_api_key_permissions( $key_permissions ) {
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switch ( WC()->api->server->method ) {
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case 'HEAD':
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case 'GET':
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if ( 'read' !== $key_permissions && 'read_write' !== $key_permissions ) {
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throw new Exception( __( 'The API key provided does not have read permissions.', 'woocommerce' ), 401 );
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}
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break;
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case 'POST':
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case 'PUT':
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case 'PATCH':
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case 'DELETE':
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if ( 'write' !== $key_permissions && 'read_write' !== $key_permissions ) {
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throw new Exception( __( 'The API key provided does not have write permissions.', 'woocommerce' ), 401 );
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}
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break;
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}
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}
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/**
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* Updated API Key last access datetime
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*
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* @since 2.4.0
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*
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* @param int $key_id
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*/
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private function update_api_key_last_access( $key_id ) {
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global $wpdb;
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$wpdb->update(
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$wpdb->prefix . 'woocommerce_api_keys',
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array( 'last_access' => current_time( 'mysql' ) ),
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array( 'key_id' => $key_id ),
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array( '%s' ),
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array( '%d' )
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);
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}
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}
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