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| 1 | <?php |
| 2 | /** |
| 3 | * The Jetpack Connection Rest Authentication file. |
| 4 | * |
| 5 | * @package automattic/jetpack-connection |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Connection; |
| 9 | |
| 10 | use WP_Error; |
| 11 | |
| 12 | /** |
| 13 | * The Jetpack Connection Rest Authentication class. |
| 14 | */ |
| 15 | class Rest_Authentication { |
| 16 | |
| 17 | /** |
| 18 | * The rest authentication status. |
| 19 | * |
| 20 | * @since 1.17.0 |
| 21 | * @var boolean |
| 22 | */ |
| 23 | private $rest_authentication_status = null; |
| 24 | |
| 25 | /** |
| 26 | * The rest authentication type. |
| 27 | * Can be either 'user' or 'blog' depending on whether the request |
| 28 | * is signed with a user or a blog token. |
| 29 | * |
| 30 | * @since 1.29.0 |
| 31 | * @var string |
| 32 | */ |
| 33 | private $rest_authentication_type = null; |
| 34 | |
| 35 | /** |
| 36 | * The Manager object. |
| 37 | * |
| 38 | * @since 1.17.0 |
| 39 | * @var Object |
| 40 | */ |
| 41 | private $connection_manager = null; |
| 42 | |
| 43 | /** |
| 44 | * Holds the singleton instance of this class |
| 45 | * |
| 46 | * @since 1.17.0 |
| 47 | * @var Object |
| 48 | */ |
| 49 | private static $instance = false; |
| 50 | |
| 51 | /** |
| 52 | * Flag used to avoid determine_current_user filter to enter an infinite loop |
| 53 | * |
| 54 | * @since 1.26.0 |
| 55 | * @var boolean |
| 56 | */ |
| 57 | private $doing_determine_current_user_filter = false; |
| 58 | |
| 59 | /** |
| 60 | * The constructor. |
| 61 | */ |
| 62 | private function __construct() { |
| 63 | $this->connection_manager = new Manager(); |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * Controls the single instance of this class. |
| 68 | * |
| 69 | * @static |
| 70 | */ |
| 71 | public static function init() { |
| 72 | if ( ! self::$instance ) { |
| 73 | self::$instance = new self(); |
| 74 | |
| 75 | add_filter( 'determine_current_user', array( self::$instance, 'wp_rest_authenticate' ) ); |
| 76 | add_filter( 'rest_authentication_errors', array( self::$instance, 'wp_rest_authentication_errors' ) ); |
| 77 | } |
| 78 | |
| 79 | return self::$instance; |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Authenticates requests from Jetpack server to WP REST API endpoints. |
| 84 | * Uses the existing XMLRPC request signing implementation. |
| 85 | * |
| 86 | * @param int|bool $user User ID if one has been determined, false otherwise. |
| 87 | * |
| 88 | * @return int|null The user id or null if the request was authenticated via blog token, or not authenticated at all. |
| 89 | */ |
| 90 | public function wp_rest_authenticate( $user ) { |
| 91 | if ( $this->doing_determine_current_user_filter ) { |
| 92 | return $user; |
| 93 | } |
| 94 | |
| 95 | $this->doing_determine_current_user_filter = true; |
| 96 | |
| 97 | try { |
| 98 | if ( ! empty( $user ) ) { |
| 99 | // Another authentication method is in effect. |
| 100 | return $user; |
| 101 | } |
| 102 | |
| 103 | add_filter( |
| 104 | 'jetpack_constant_default_value', |
| 105 | __NAMESPACE__ . '\Utils::jetpack_api_constant_filter', |
| 106 | 10, |
| 107 | 2 |
| 108 | ); |
| 109 | |
| 110 | // phpcs:ignore WordPress.Security.NonceVerification.Recommended |
| 111 | if ( ! isset( $_GET['_for'] ) || 'jetpack' !== $_GET['_for'] ) { |
| 112 | // Nothing to do for this authentication method. |
| 113 | return null; |
| 114 | } |
| 115 | |
| 116 | // phpcs:ignore WordPress.Security.NonceVerification.Recommended |
| 117 | if ( ! isset( $_GET['token'] ) && ! isset( $_GET['signature'] ) ) { |
| 118 | // Nothing to do for this authentication method. |
| 119 | return null; |
| 120 | } |
| 121 | |
| 122 | if ( ! isset( $_SERVER['REQUEST_METHOD'] ) ) { |
| 123 | $this->rest_authentication_status = new WP_Error( |
| 124 | 'rest_invalid_request', |
| 125 | __( 'The request method is missing.', 'jetpack-connection' ), |
| 126 | array( 'status' => 400 ) |
| 127 | ); |
| 128 | return null; |
| 129 | } |
| 130 | |
| 131 | // Only support specific request parameters that have been tested and |
| 132 | // are known to work with signature verification. A different method |
| 133 | // can be passed to the WP REST API via the '?_method=' parameter if |
| 134 | // needed. |
| 135 | if ( 'GET' !== $_SERVER['REQUEST_METHOD'] && 'POST' !== $_SERVER['REQUEST_METHOD'] ) { |
| 136 | $this->rest_authentication_status = new WP_Error( |
| 137 | 'rest_invalid_request', |
| 138 | __( 'This request method is not supported.', 'jetpack-connection' ), |
| 139 | array( 'status' => 400 ) |
| 140 | ); |
| 141 | return null; |
| 142 | } |
| 143 | if ( 'POST' !== $_SERVER['REQUEST_METHOD'] && ! empty( file_get_contents( 'php://input' ) ) ) { |
| 144 | $this->rest_authentication_status = new WP_Error( |
| 145 | 'rest_invalid_request', |
| 146 | __( 'This request method does not support body parameters.', 'jetpack-connection' ), |
| 147 | array( 'status' => 400 ) |
| 148 | ); |
| 149 | return null; |
| 150 | } |
| 151 | |
| 152 | $verified = $this->connection_manager->verify_xml_rpc_signature(); |
| 153 | |
| 154 | if ( |
| 155 | $verified && |
| 156 | isset( $verified['type'] ) && |
| 157 | 'blog' === $verified['type'] |
| 158 | ) { |
| 159 | // Site-level authentication successful. |
| 160 | $this->rest_authentication_status = true; |
| 161 | $this->rest_authentication_type = 'blog'; |
| 162 | return null; |
| 163 | } |
| 164 | |
| 165 | if ( |
| 166 | $verified && |
| 167 | isset( $verified['type'] ) && |
| 168 | 'user' === $verified['type'] && |
| 169 | ! empty( $verified['user_id'] ) |
| 170 | ) { |
| 171 | // User-level authentication successful. |
| 172 | $this->rest_authentication_status = true; |
| 173 | $this->rest_authentication_type = 'user'; |
| 174 | return $verified['user_id']; |
| 175 | } |
| 176 | |
| 177 | // Something else went wrong. Probably a signature error. |
| 178 | $this->rest_authentication_status = new WP_Error( |
| 179 | 'rest_invalid_signature', |
| 180 | __( 'The request is not signed correctly.', 'jetpack-connection' ), |
| 181 | array( 'status' => 400 ) |
| 182 | ); |
| 183 | return null; |
| 184 | } finally { |
| 185 | $this->doing_determine_current_user_filter = false; |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * Report authentication status to the WP REST API. |
| 191 | * |
| 192 | * @param WP_Error|mixed $value Error from another authentication handler, null if we should handle it, or another value if not. |
| 193 | * @return WP_Error|boolean|null {@see WP_JSON_Server::check_authentication} |
| 194 | */ |
| 195 | public function wp_rest_authentication_errors( $value ) { |
| 196 | if ( null !== $value ) { |
| 197 | return $value; |
| 198 | } |
| 199 | return $this->rest_authentication_status; |
| 200 | } |
| 201 | |
| 202 | /** |
| 203 | * Resets the saved authentication state in between testing requests. |
| 204 | */ |
| 205 | public function reset_saved_auth_state() { |
| 206 | $this->rest_authentication_status = null; |
| 207 | $this->connection_manager->reset_saved_auth_state(); |
| 208 | } |
| 209 | |
| 210 | /** |
| 211 | * Whether the request was signed with a blog token. |
| 212 | * |
| 213 | * @since 1.29.0 |
| 214 | * |
| 215 | * @return bool True if the request was signed with a valid blog token, false otherwise. |
| 216 | */ |
| 217 | public static function is_signed_with_blog_token() { |
| 218 | $instance = self::init(); |
| 219 | |
| 220 | return true === $instance->rest_authentication_status && 'blog' === $instance->rest_authentication_type; |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * Whether the request was signed with a user token. |
| 225 | * |
| 226 | * @since 6.7.0 |
| 227 | * |
| 228 | * @return bool True if the request was signed with a valid user token, false otherwise. |
| 229 | */ |
| 230 | public static function is_signed_with_user_token() { |
| 231 | $instance = self::init(); |
| 232 | |
| 233 | return true === $instance->rest_authentication_status && 'user' === $instance->rest_authentication_type; |
| 234 | } |
| 235 | } |