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| 1 | <?php |
| 2 | /** |
| 3 | * The Jetpack Connection Secrets class file. |
| 4 | * |
| 5 | * @package automattic/jetpack-connection |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\Connection; |
| 9 | |
| 10 | use Jetpack_Options; |
| 11 | use WP_Error; |
| 12 | |
| 13 | /** |
| 14 | * The Jetpack Connection Secrets class that is used to manage secrets. |
| 15 | */ |
| 16 | class Secrets { |
| 17 | |
| 18 | const SECRETS_MISSING = 'secrets_missing'; |
| 19 | const SECRETS_EXPIRED = 'secrets_expired'; |
| 20 | const LEGACY_SECRETS_OPTION_NAME = 'jetpack_secrets'; |
| 21 | |
| 22 | /** |
| 23 | * Deletes all connection secrets from the local Jetpack site. |
| 24 | */ |
| 25 | public function delete_all() { |
| 26 | Jetpack_Options::delete_raw_option( 'jetpack_secrets' ); |
| 27 | } |
| 28 | |
| 29 | /** |
| 30 | * Runs the wp_generate_password function with the required parameters. This is the |
| 31 | * default implementation of the secret callable, can be overridden using the |
| 32 | * jetpack_connection_secret_generator filter. |
| 33 | * |
| 34 | * @return String $secret value. |
| 35 | */ |
| 36 | private function secret_callable_method() { |
| 37 | $secret = wp_generate_password( 32, false ); |
| 38 | |
| 39 | // Some sites may hook into the random_password filter and make the password shorter, let's make sure our secret has the required length. |
| 40 | $attempts = 1; |
| 41 | $secret_length = strlen( $secret ); |
| 42 | while ( $secret_length < 32 && $attempts < 32 ) { |
| 43 | ++$attempts; |
| 44 | $secret .= wp_generate_password( 32, false ); |
| 45 | $secret_length = strlen( $secret ); |
| 46 | } |
| 47 | return (string) substr( $secret, 0, 32 ); |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Generates two secret tokens and the end of life timestamp for them. |
| 52 | * |
| 53 | * @param String $action The action name. |
| 54 | * @param Integer|bool $user_id The user identifier. Defaults to `false`. |
| 55 | * @param Integer $exp Expiration time in seconds. |
| 56 | */ |
| 57 | public function generate( $action, $user_id = false, $exp = 600 ) { |
| 58 | if ( false === $user_id ) { |
| 59 | $user_id = get_current_user_id(); |
| 60 | } |
| 61 | |
| 62 | $callable = apply_filters( 'jetpack_connection_secret_generator', array( static::class, 'secret_callable_method' ) ); |
| 63 | |
| 64 | $secrets = Jetpack_Options::get_raw_option( |
| 65 | self::LEGACY_SECRETS_OPTION_NAME, |
| 66 | array() |
| 67 | ); |
| 68 | |
| 69 | $secret_name = 'jetpack_' . $action . '_' . $user_id; |
| 70 | |
| 71 | if ( |
| 72 | isset( $secrets[ $secret_name ] ) && |
| 73 | $secrets[ $secret_name ]['exp'] > time() |
| 74 | ) { |
| 75 | return $secrets[ $secret_name ]; |
| 76 | } |
| 77 | |
| 78 | $secret_value = array( |
| 79 | 'secret_1' => call_user_func( $callable ), |
| 80 | 'secret_2' => call_user_func( $callable ), |
| 81 | 'exp' => time() + $exp, |
| 82 | ); |
| 83 | |
| 84 | $secrets[ $secret_name ] = $secret_value; |
| 85 | |
| 86 | $res = Jetpack_Options::update_raw_option( self::LEGACY_SECRETS_OPTION_NAME, $secrets ); |
| 87 | return $res ? $secrets[ $secret_name ] : false; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Returns two secret tokens and the end of life timestamp for them. |
| 92 | * |
| 93 | * @param String $action The action name. |
| 94 | * @param Integer $user_id The user identifier. |
| 95 | * @return string|array an array of secrets or an error string. |
| 96 | * @phan-return string|array{secret_1:string,secret_2:string,exp:int} |
| 97 | */ |
| 98 | public function get( $action, $user_id ) { |
| 99 | $secret_name = 'jetpack_' . $action . '_' . $user_id; |
| 100 | $secrets = Jetpack_Options::get_raw_option( |
| 101 | self::LEGACY_SECRETS_OPTION_NAME, |
| 102 | array() |
| 103 | ); |
| 104 | |
| 105 | if ( ! isset( $secrets[ $secret_name ] ) ) { |
| 106 | return self::SECRETS_MISSING; |
| 107 | } |
| 108 | |
| 109 | if ( $secrets[ $secret_name ]['exp'] < time() ) { |
| 110 | $this->delete( $action, $user_id ); |
| 111 | return self::SECRETS_EXPIRED; |
| 112 | } |
| 113 | |
| 114 | return $secrets[ $secret_name ]; |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * Deletes secret tokens in case they, for example, have expired. |
| 119 | * |
| 120 | * @param String $action The action name. |
| 121 | * @param Integer $user_id The user identifier. |
| 122 | */ |
| 123 | public function delete( $action, $user_id ) { |
| 124 | $secret_name = 'jetpack_' . $action . '_' . $user_id; |
| 125 | $secrets = Jetpack_Options::get_raw_option( |
| 126 | self::LEGACY_SECRETS_OPTION_NAME, |
| 127 | array() |
| 128 | ); |
| 129 | if ( isset( $secrets[ $secret_name ] ) ) { |
| 130 | unset( $secrets[ $secret_name ] ); |
| 131 | Jetpack_Options::update_raw_option( self::LEGACY_SECRETS_OPTION_NAME, $secrets ); |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Verify a Previously Generated Secret. |
| 137 | * |
| 138 | * @param string $action The type of secret to verify. |
| 139 | * @param string $secret_1 The secret string to compare to what is stored. |
| 140 | * @param int $user_id The user ID of the owner of the secret. |
| 141 | * @return WP_Error|string WP_Error on failure, secret_2 on success. |
| 142 | */ |
| 143 | public function verify( $action, $secret_1, $user_id ) { |
| 144 | $allowed_actions = array( 'register', 'authorize', 'publicize' ); |
| 145 | if ( ! in_array( $action, $allowed_actions, true ) ) { |
| 146 | return new WP_Error( 'unknown_verification_action', 'Unknown Verification Action', 400 ); |
| 147 | } |
| 148 | |
| 149 | $user = get_user_by( 'id', $user_id ); |
| 150 | |
| 151 | /** |
| 152 | * We've begun verifying the previously generated secret. |
| 153 | * |
| 154 | * @since 1.7.0 |
| 155 | * @since-jetpack 7.5.0 |
| 156 | * |
| 157 | * @param string $action The type of secret to verify. |
| 158 | * @param \WP_User $user The user object. |
| 159 | */ |
| 160 | do_action( 'jetpack_verify_secrets_begin', $action, $user ); |
| 161 | |
| 162 | /** Closure to run the 'fail' action and return an error. */ |
| 163 | $return_error = function ( WP_Error $error ) use ( $action, $user ) { |
| 164 | /** |
| 165 | * Verifying of the previously generated secret has failed. |
| 166 | * |
| 167 | * @since 1.7.0 |
| 168 | * @since-jetpack 7.5.0 |
| 169 | * |
| 170 | * @param string $action The type of secret to verify. |
| 171 | * @param \WP_User $user The user object. |
| 172 | * @param WP_Error $error The error object. |
| 173 | */ |
| 174 | do_action( 'jetpack_verify_secrets_fail', $action, $user, $error ); |
| 175 | |
| 176 | return $error; |
| 177 | }; |
| 178 | |
| 179 | $stored_secrets = $this->get( $action, $user_id ); |
| 180 | $this->delete( $action, $user_id ); |
| 181 | |
| 182 | $error = null; |
| 183 | if ( empty( $secret_1 ) ) { |
| 184 | $error = $return_error( |
| 185 | new WP_Error( |
| 186 | 'verify_secret_1_missing', |
| 187 | /* translators: "%s" is the name of a paramter. It can be either "secret_1" or "state". */ |
| 188 | sprintf( __( 'The required "%s" parameter is missing.', 'jetpack-connection' ), 'secret_1' ), |
| 189 | 400 |
| 190 | ) |
| 191 | ); |
| 192 | } elseif ( ! is_string( $secret_1 ) ) { |
| 193 | $error = $return_error( |
| 194 | new WP_Error( |
| 195 | 'verify_secret_1_malformed', |
| 196 | /* translators: "%s" is the name of a paramter. It can be either "secret_1" or "state". */ |
| 197 | sprintf( __( 'The required "%s" parameter is malformed.', 'jetpack-connection' ), 'secret_1' ), |
| 198 | 400 |
| 199 | ) |
| 200 | ); |
| 201 | } elseif ( empty( $user_id ) ) { |
| 202 | // $user_id is passed around during registration as "state". |
| 203 | $error = $return_error( |
| 204 | new WP_Error( |
| 205 | 'state_missing', |
| 206 | /* translators: "%s" is the name of a paramter. It can be either "secret_1" or "state". */ |
| 207 | sprintf( __( 'The required "%s" parameter is missing.', 'jetpack-connection' ), 'state' ), |
| 208 | 400 |
| 209 | ) |
| 210 | ); |
| 211 | } elseif ( ! ctype_digit( (string) $user_id ) ) { |
| 212 | $error = $return_error( |
| 213 | new WP_Error( |
| 214 | 'state_malformed', |
| 215 | /* translators: "%s" is the name of a paramter. It can be either "secret_1" or "state". */ |
| 216 | sprintf( __( 'The required "%s" parameter is malformed.', 'jetpack-connection' ), 'state' ), |
| 217 | 400 |
| 218 | ) |
| 219 | ); |
| 220 | } elseif ( self::SECRETS_MISSING === $stored_secrets ) { |
| 221 | $error = $return_error( |
| 222 | new WP_Error( |
| 223 | 'verify_secrets_missing', |
| 224 | __( 'Verification secrets not found', 'jetpack-connection' ), |
| 225 | 400 |
| 226 | ) |
| 227 | ); |
| 228 | } elseif ( self::SECRETS_EXPIRED === $stored_secrets ) { |
| 229 | $error = $return_error( |
| 230 | new WP_Error( |
| 231 | 'verify_secrets_expired', |
| 232 | __( 'Verification took too long', 'jetpack-connection' ), |
| 233 | 400 |
| 234 | ) |
| 235 | ); |
| 236 | } elseif ( ! $stored_secrets ) { |
| 237 | $error = $return_error( |
| 238 | new WP_Error( |
| 239 | 'verify_secrets_empty', |
| 240 | __( 'Verification secrets are empty', 'jetpack-connection' ), |
| 241 | 400 |
| 242 | ) |
| 243 | ); |
| 244 | } elseif ( is_wp_error( $stored_secrets ) ) { |
| 245 | $stored_secrets->add_data( 400 ); |
| 246 | $error = $return_error( $stored_secrets ); |
| 247 | } elseif ( empty( $stored_secrets['secret_1'] ) || empty( $stored_secrets['secret_2'] ) || empty( $stored_secrets['exp'] ) ) { |
| 248 | $error = $return_error( |
| 249 | new WP_Error( |
| 250 | 'verify_secrets_incomplete', |
| 251 | __( 'Verification secrets are incomplete', 'jetpack-connection' ), |
| 252 | 400 |
| 253 | ) |
| 254 | ); |
| 255 | } elseif ( ! hash_equals( $secret_1, $stored_secrets['secret_1'] ) ) { |
| 256 | $error = $return_error( |
| 257 | new WP_Error( |
| 258 | 'verify_secrets_mismatch', |
| 259 | __( 'Secret mismatch', 'jetpack-connection' ), |
| 260 | 400 |
| 261 | ) |
| 262 | ); |
| 263 | } |
| 264 | |
| 265 | // Something went wrong during the checks, returning the error. |
| 266 | if ( ! empty( $error ) ) { |
| 267 | return $error; |
| 268 | } |
| 269 | |
| 270 | /** |
| 271 | * We've succeeded at verifying the previously generated secret. |
| 272 | * |
| 273 | * @since 1.7.0 |
| 274 | * @since-jetpack 7.5.0 |
| 275 | * |
| 276 | * @param string $action The type of secret to verify. |
| 277 | * @param \WP_User $user The user object. |
| 278 | */ |
| 279 | do_action( 'jetpack_verify_secrets_success', $action, $user ); |
| 280 | |
| 281 | return $stored_secrets['secret_2']; |
| 282 | } |
| 283 | } |