769 lines
22 KiB
PHP
769 lines
22 KiB
PHP
<?php
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/**
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* Class for creating a Time Based One-Time Password provider.
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*
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* @package Two_Factor
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*/
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/**
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* Class Two_Factor_Totp
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*/
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class Two_Factor_Totp extends Two_Factor_Provider {
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/**
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* The user meta key for the TOTP Secret key.
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*
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* @var string
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*/
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const SECRET_META_KEY = '_two_factor_totp_key';
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/**
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* The user meta key for the last successful TOTP token timestamp logged in with.
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*
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* @var string
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*/
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const LAST_SUCCESSFUL_LOGIN_META_KEY = '_two_factor_totp_last_successful_login';
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const DEFAULT_KEY_BIT_SIZE = 160;
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const DEFAULT_CRYPTO = 'sha1';
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const DEFAULT_DIGIT_COUNT = 6;
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const DEFAULT_TIME_STEP_SEC = 30;
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const DEFAULT_TIME_STEP_ALLOWANCE = 4;
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/**
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* Characters used in base32 encoding.
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*
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* @var string
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*/
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private static $base_32_chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567';
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/**
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* Ensures only one instance of this class exists in memory at any one time.
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*
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* @codeCoverageIgnore
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*/
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public static function get_instance() {
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static $instance;
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if ( ! isset( $instance ) ) {
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$instance = new self();
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}
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return $instance;
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}
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/**
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* Class constructor. Sets up hooks, etc.
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*
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* @codeCoverageIgnore
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*/
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protected function __construct() {
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add_action( 'rest_api_init', array( $this, 'register_rest_routes' ) );
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add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_assets' ) );
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add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_assets' ) );
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add_action( 'two_factor_user_options_' . __CLASS__, array( $this, 'user_two_factor_options' ) );
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return parent::__construct();
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}
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/**
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* Register the rest-api endpoints required for this provider.
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*
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* @codeCoverageIgnore
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*/
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public function register_rest_routes() {
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register_rest_route(
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Two_Factor_Core::REST_NAMESPACE,
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'/totp',
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array(
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array(
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'methods' => WP_REST_Server::DELETABLE,
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'callback' => array( $this, 'rest_delete_totp' ),
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'permission_callback' => function( $request ) {
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return current_user_can( 'edit_user', $request['user_id'] );
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},
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'args' => array(
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'user_id' => array(
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'required' => true,
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'type' => 'number',
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),
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),
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),
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array(
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'methods' => WP_REST_Server::CREATABLE,
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'callback' => array( $this, 'rest_setup_totp' ),
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'permission_callback' => function( $request ) {
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return current_user_can( 'edit_user', $request['user_id'] );
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},
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'args' => array(
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'user_id' => array(
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'required' => true,
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'type' => 'number',
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),
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'key' => array(
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'type' => 'string',
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'default' => '',
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'validate_callback' => null, // Note: validation handled in ::rest_setup_totp().
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),
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'code' => array(
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'type' => 'string',
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'default' => '',
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'validate_callback' => null, // Note: validation handled in ::rest_setup_totp().
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),
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'enable_provider' => array(
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'required' => false,
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'type' => 'boolean',
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'default' => false,
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),
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),
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),
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)
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);
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}
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/**
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* Returns the name of the provider.
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*/
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public function get_label() {
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return _x( 'Time Based One-Time Password (TOTP)', 'Provider Label', 'two-factor' );
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}
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/**
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* Enqueue scripts
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*
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* @codeCoverageIgnore
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*/
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public function enqueue_assets( $hook_suffix ) {
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$environment_prefix = file_exists( TWO_FACTOR_DIR . '/dist' ) ? '/dist' : '';
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wp_register_script(
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'two-factor-qr-code-generator',
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plugins_url( $environment_prefix . '/includes/qrcode-generator/qrcode.js', __DIR__ ),
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array(),
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TWO_FACTOR_VERSION,
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true
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);
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}
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/**
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* Rest API endpoint for handling deactivation of TOTP.
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*
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* @param WP_Rest_Request $request The Rest Request object.
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* @return array Success array.
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*/
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public function rest_delete_totp( $request ) {
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$user_id = $request['user_id'];
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$user = get_user_by( 'id', $user_id );
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$this->delete_user_totp_key( $user_id );
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ob_start();
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$this->user_two_factor_options( $user );
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$html = ob_get_clean();
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return [
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'success' => true,
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'html' => $html,
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];
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}
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/**
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* REST API endpoint for setting up TOTP.
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*
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* @param WP_Rest_Request $request The Rest Request object.
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* @return WP_Error|array Array of data on success, WP_Error on error.
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*/
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public function rest_setup_totp( $request ) {
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$user_id = $request['user_id'];
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$user = get_user_by( 'id', $user_id );
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$key = $request['key'];
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$code = preg_replace( '/\s+/', '', $request['code'] );
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if ( ! $this->is_valid_key( $key ) ) {
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return new WP_Error( 'invalid_key', __( 'Invalid Two Factor Authentication secret key.', 'two-factor' ), array( 'status' => 400 ) );
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}
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if ( ! $this->is_valid_authcode( $key, $code ) ) {
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return new WP_Error( 'invalid_key_code', __( 'Invalid Two Factor Authentication code.', 'two-factor' ), array( 'status' => 400 ) );
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}
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if ( ! $this->set_user_totp_key( $user_id, $key ) ) {
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return new WP_Error( 'db_error', __( 'Unable to save Two Factor Authentication code. Please re-scan the QR code and enter the code provided by your application.', 'two-factor' ), array( 'status' => 500 ) );
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}
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if ( $request->get_param( 'enable_provider' ) && ! Two_Factor_Core::enable_provider_for_user( $user_id, 'Two_Factor_Totp' ) ) {
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return new WP_Error( 'db_error', __( 'Unable to enable TOTP provider for this user.', 'two-factor' ), array( 'status' => 500 ) );
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}
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ob_start();
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$this->user_two_factor_options( $user );
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$html = ob_get_clean();
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return [
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'success' => true,
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'html' => $html,
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];
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}
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/**
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* Generates a URL that can be used to create a QR code.
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*
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* @param WP_User $user The user to generate a URL for.
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* @param string $key The secret key.
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*
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* @return string
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*/
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public static function generate_qr_code_url( $user, $secret_key ) {
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$issuer = get_bloginfo( 'name', 'display' );
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/**
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* Filter the Issuer for the TOTP.
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*
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* Must follow the TOTP format for a "issuer". Do not URL Encode.
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*
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* @see https://github.com/google/google-authenticator/wiki/Key-Uri-Format#issuer
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* @param string $issuer The issuer for TOTP.
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*/
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$issuer = apply_filters( 'two_factor_totp_issuer', $issuer );
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/**
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* Filter the Label for the TOTP.
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*
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* Must follow the TOTP format for a "label". Do not URL Encode.
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*
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* @see https://github.com/google/google-authenticator/wiki/Key-Uri-Format#label
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* @param string $totp_title The label for the TOTP.
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* @param WP_User $user The User object.
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* @param string $issuer The issuer of the TOTP. This should be the prefix of the result.
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*/
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$totp_title = apply_filters( 'two_factor_totp_title', $issuer . ':' . $user->user_login, $user, $issuer );
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$totp_url = add_query_arg(
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array(
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'secret' => rawurlencode( $secret_key ),
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'issuer' => rawurlencode( $issuer ),
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),
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'otpauth://totp/' . rawurlencode( $totp_title )
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);
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/**
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* Filter the TOTP generated URL.
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*
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* Must follow the TOTP format. Do not URL Encode.
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*
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* @see https://github.com/google/google-authenticator/wiki/Key-Uri-Format
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* @param string $totp_url The TOTP URL.
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* @param WP_User $user The user object.
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*/
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$totp_url = apply_filters( 'two_factor_totp_url', $totp_url, $user );
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$totp_url = esc_url( $totp_url, array( 'otpauth' ) );
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return $totp_url;
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}
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/**
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* Display TOTP options on the user settings page.
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*
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* @param WP_User $user The current user being edited.
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* @return false
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*
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* @codeCoverageIgnore
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*/
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public function user_two_factor_options( $user ) {
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if ( ! isset( $user->ID ) ) {
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return false;
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}
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$key = $this->get_user_totp_key( $user->ID );
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wp_enqueue_script( 'two-factor-qr-code-generator' );
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?>
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<div id="two-factor-totp-options">
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<?php
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if ( empty( $key ) ) :
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$key = $this->generate_key();
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$totp_url = $this->generate_qr_code_url( $user, $key );
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?>
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<p>
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<?php esc_html_e( 'Please scan the QR code or manually enter the key, then enter an authentication code from your app in order to complete setup.', 'two-factor' ); ?>
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</p>
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<p id="two-factor-qr-code">
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<a href="<?php echo $totp_url; ?>">
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Loading...
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<img src="<?php echo esc_url( admin_url( 'images/spinner.gif' ) ); ?>" alt="" />
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</a>
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</p>
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<style>
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#two-factor-qr-code {
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/* The size of the image will change based on the length of the URL inside it. */
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min-width: 205px;
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min-height: 205px;
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}
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</style>
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<script>
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(function(){
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var qr_generator = function() {
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/*
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* 0 = Automatically select the version, to avoid going over the limit of URL
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* length.
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* L = Least amount of error correction, because it's not needed when scanning
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* on a monitor, and it lowers the image size.
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*/
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var qr = qrcode( 0, 'L' );
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qr.addData( <?php echo wp_json_encode( $totp_url ); ?> );
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qr.make();
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document.querySelector( '#two-factor-qr-code a' ).innerHTML = qr.createSvgTag( 5 );
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};
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// Run now if the document is loaded, otherwise on DOMContentLoaded.
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if ( document.readyState === 'complete' ) {
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qr_generator();
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} else {
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window.addEventListener( 'DOMContentLoaded', qr_generator );
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}
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})();
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</script>
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<p>
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<code><?php echo esc_html( $key ); ?></code>
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</p>
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<p>
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<input type="hidden" id="two-factor-totp-key" name="two-factor-totp-key" value="<?php echo esc_attr( $key ); ?>" />
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<label for="two-factor-totp-authcode">
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<?php esc_html_e( 'Authentication Code:', 'two-factor' ); ?>
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<?php
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/* translators: Example auth code. */
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$placeholder = sprintf( __( 'eg. %s', 'two-factor' ), '123456' );
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?>
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<input type="tel" name="two-factor-totp-authcode" id="two-factor-totp-authcode" class="input" value="" size="20" pattern="[0-9 ]*" placeholder="<?php echo esc_attr( $placeholder ); ?>" />
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</label>
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<input type="submit" class="button totp-submit" name="two-factor-totp-submit" value="<?php esc_attr_e( 'Submit', 'two-factor' ); ?>" />
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</p>
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<script>
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(function($){
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$('.totp-submit').click( function( e ) {
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e.preventDefault();
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var key = $('#two-factor-totp-key').val(),
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code = $('#two-factor-totp-authcode').val();
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wp.apiRequest( {
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method: 'POST',
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path: <?php echo wp_json_encode( Two_Factor_Core::REST_NAMESPACE . '/totp' ); ?>,
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data: {
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user_id: <?php echo wp_json_encode( $user->ID ); ?>,
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key: key,
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code: code,
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}
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} ).fail( function( response, status ) {
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var errorMessage = response.responseJSON.message || status,
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$error = $( '#totp-setup-error' );
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if ( ! $error.length ) {
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$error = $('<div class="error" id="totp-setup-error"><p></p></div>').insertAfter( $('.totp-submit') );
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}
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$error.find('p').text( errorMessage );
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$('#two-factor-totp-authcode').val('');
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} ).then( function( response ) {
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$( '#two-factor-totp-options' ).html( response.html );
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} );
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} );
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})(jQuery);
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</script>
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<?php else : ?>
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<p class="success">
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<?php esc_html_e( 'Secret key is configured and registered. It is not possible to view it again for security reasons.', 'two-factor' ); ?>
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</p>
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<p>
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<a class="button reset-totp-key" href="#"><?php esc_html_e( 'Reset Key', 'two-factor' ); ?></a>
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<em class="description">
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<?php esc_html_e( 'You will have to re-scan the QR code on all devices as the previous codes will stop working.', 'two-factor' ); ?>
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</em>
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<script>
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( function( $ ) {
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$( 'a.reset-totp-key' ).click( function( e ) {
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e.preventDefault();
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wp.apiRequest( {
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method: 'DELETE',
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path: <?php echo wp_json_encode( Two_Factor_Core::REST_NAMESPACE . '/totp' ); ?>,
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data: {
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user_id: <?php echo wp_json_encode( $user->ID ); ?>,
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}
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} ).then( function( response ) {
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$( '#two-factor-totp-options' ).html( response.html );
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} );
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} );
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} )( jQuery );
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</script>
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</p>
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<?php endif; ?>
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</div>
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<?php
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}
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/**
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* Get the TOTP secret key for a user.
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*
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* @param int $user_id User ID.
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*
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* @return string
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*/
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public function get_user_totp_key( $user_id ) {
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return (string) get_user_meta( $user_id, self::SECRET_META_KEY, true );
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}
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/**
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* Set the TOTP secret key for a user.
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*
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* @param int $user_id User ID.
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* @param string $key TOTP secret key.
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*
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* @return boolean If the key was stored successfully.
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*/
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public function set_user_totp_key( $user_id, $key ) {
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return update_user_meta( $user_id, self::SECRET_META_KEY, $key );
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}
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|
|
/**
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* Delete the TOTP secret key for a user.
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*
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* @param int $user_id User ID.
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*
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* @return boolean If the key was deleted successfully.
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*/
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public function delete_user_totp_key( $user_id ) {
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delete_user_meta( $user_id, self::LAST_SUCCESSFUL_LOGIN_META_KEY );
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return delete_user_meta( $user_id, self::SECRET_META_KEY );
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}
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|
|
/**
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* Check if the TOTP secret key has a proper format.
|
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*
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* @param string $key TOTP secret key.
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*
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* @return boolean
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*/
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public function is_valid_key( $key ) {
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$check = sprintf( '/^[%s]+$/', self::$base_32_chars );
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if ( 1 === preg_match( $check, $key ) ) {
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return true;
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}
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return false;
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}
|
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|
|
/**
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* Validates authentication.
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*
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* @param WP_User $user WP_User object of the logged-in user.
|
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*
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* @return bool Whether the user gave a valid code
|
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*/
|
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public function validate_authentication( $user ) {
|
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$code = $this->sanitize_code_from_request( 'authcode', self::DEFAULT_DIGIT_COUNT );
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if ( ! $code ) {
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return false;
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}
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return $this->validate_code_for_user( $user, $code );
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}
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|
|
/**
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* Validates an authentication code for a given user, preventing re-use and older TOTP keys.
|
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*
|
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* @param WP_User $user WP_User object of the logged-in user.
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* @param int $code The TOTP token to validate.
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*
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* @return bool Whether the code is valid for the user and a newer code has not been used.
|
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*/
|
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public function validate_code_for_user( $user, $code ) {
|
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$valid_timestamp = $this->get_authcode_valid_ticktime(
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$this->get_user_totp_key( $user->ID ),
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$code
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);
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|
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if ( ! $valid_timestamp ) {
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return false;
|
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}
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|
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$last_totp_login = (int) get_user_meta( $user->ID, self::LAST_SUCCESSFUL_LOGIN_META_KEY, true );
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|
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// The TOTP authentication is not valid, if we've seen the same or newer code.
|
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if ( $last_totp_login && $last_totp_login >= $valid_timestamp ) {
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return false;
|
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}
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|
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update_user_meta( $user->ID, self::LAST_SUCCESSFUL_LOGIN_META_KEY, $valid_timestamp );
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return true;
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}
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|
|
|
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/**
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* Checks if a given code is valid for a given key, allowing for a certain amount of time drift.
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*
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* @param string $key The share secret key to use.
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* @param string $authcode The code to test.
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*
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* @return bool Whether the code is valid within the time frame.
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*/
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public static function is_valid_authcode( $key, $authcode ) {
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return (bool) self::get_authcode_valid_ticktime( $key, $authcode );
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}
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/**
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* Checks if a given code is valid for a given key, allowing for a certain amount of time drift.
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*
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* @param string $key The share secret key to use.
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* @param string $authcode The code to test.
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*
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* @return false|int Returns the timestamp of the authcode on success, False otherwise.
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*/
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public static function get_authcode_valid_ticktime( $key, $authcode ) {
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/**
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* Filter the maximum ticks to allow when checking valid codes.
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*
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* Ticks are the allowed offset from the correct time in 30 second increments,
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* so the default of 4 allows codes that are two minutes to either side of server time
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*
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* @deprecated 0.7.0 Use {@see 'two_factor_totp_time_step_allowance'} instead.
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* @param int $max_ticks Max ticks of time correction to allow. Default 4.
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*/
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$max_ticks = apply_filters_deprecated( 'two-factor-totp-time-step-allowance', array( self::DEFAULT_TIME_STEP_ALLOWANCE ), '0.7.0', 'two_factor_totp_time_step_allowance' );
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$max_ticks = apply_filters( 'two_factor_totp_time_step_allowance', self::DEFAULT_TIME_STEP_ALLOWANCE );
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// Array of all ticks to allow, sorted using absolute value to test closest match first.
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$ticks = range( - $max_ticks, $max_ticks );
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usort( $ticks, array( __CLASS__, 'abssort' ) );
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$time = floor( time() / self::DEFAULT_TIME_STEP_SEC );
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foreach ( $ticks as $offset ) {
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$log_time = $time + $offset;
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if ( hash_equals( self::calc_totp( $key, $log_time ), $authcode ) ) {
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// Return the tick timestamp.
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return $log_time * self::DEFAULT_TIME_STEP_SEC;
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}
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}
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return false;
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}
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/**
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* Generates key
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*
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* @param int $bitsize Nume of bits to use for key.
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*
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* @return string $bitsize long string composed of available base32 chars.
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*/
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public static function generate_key( $bitsize = self::DEFAULT_KEY_BIT_SIZE ) {
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$bytes = ceil( $bitsize / 8 );
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$secret = wp_generate_password( $bytes, true, true );
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return self::base32_encode( $secret );
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}
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/**
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* Pack stuff
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*
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* @param string $value The value to be packed.
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*
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* @return string Binary packed string.
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*/
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public static function pack64( $value ) {
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// 64bit mode (PHP_INT_SIZE == 8).
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if ( PHP_INT_SIZE >= 8 ) {
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// If we're on PHP 5.6.3+ we can use the new 64bit pack functionality.
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if ( version_compare( PHP_VERSION, '5.6.3', '>=' ) && PHP_INT_SIZE >= 8 ) {
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return pack( 'J', $value ); // phpcs:ignore PHPCompatibility.ParameterValues.NewPackFormat.NewFormatFound
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}
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$highmap = 0xffffffff << 32;
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$higher = ( $value & $highmap ) >> 32;
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} else {
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/*
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* 32bit PHP can't shift 32 bits like that, so we have to assume 0 for the higher
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* and not pack anything beyond it's limits.
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*/
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$higher = 0;
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}
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$lowmap = 0xffffffff;
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$lower = $value & $lowmap;
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return pack( 'NN', $higher, $lower );
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}
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/**
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* Calculate a valid code given the shared secret key
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*
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* @param string $key The shared secret key to use for calculating code.
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* @param mixed $step_count The time step used to calculate the code, which is the floor of time() divided by step size.
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* @param int $digits The number of digits in the returned code.
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* @param string $hash The hash used to calculate the code.
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* @param int $time_step The size of the time step.
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*
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* @return string The totp code
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*/
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public static function calc_totp( $key, $step_count = false, $digits = self::DEFAULT_DIGIT_COUNT, $hash = self::DEFAULT_CRYPTO, $time_step = self::DEFAULT_TIME_STEP_SEC ) {
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$secret = self::base32_decode( $key );
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if ( false === $step_count ) {
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$step_count = floor( time() / $time_step );
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}
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$timestamp = self::pack64( $step_count );
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$hash = hash_hmac( $hash, $timestamp, $secret, true );
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$offset = ord( $hash[19] ) & 0xf;
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$code = (
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( ( ord( $hash[ $offset + 0 ] ) & 0x7f ) << 24 ) |
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( ( ord( $hash[ $offset + 1 ] ) & 0xff ) << 16 ) |
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( ( ord( $hash[ $offset + 2 ] ) & 0xff ) << 8 ) |
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( ord( $hash[ $offset + 3 ] ) & 0xff )
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) % pow( 10, $digits );
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return str_pad( $code, $digits, '0', STR_PAD_LEFT );
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}
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/**
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* Whether this Two Factor provider is configured and available for the user specified.
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*
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* @param WP_User $user WP_User object of the logged-in user.
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*
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* @return boolean
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*/
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public function is_available_for_user( $user ) {
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// Only available if the secret key has been saved for the user.
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$key = $this->get_user_totp_key( $user->ID );
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return ! empty( $key );
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}
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/**
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* Prints the form that prompts the user to authenticate.
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*
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* @param WP_User $user WP_User object of the logged-in user.
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*
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* @codeCoverageIgnore
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*/
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public function authentication_page( $user ) {
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require_once ABSPATH . '/wp-admin/includes/template.php';
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?>
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<p class="two-factor-prompt">
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<?php esc_html_e( 'Please enter the code generated by your authenticator app.', 'two-factor' ); ?>
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</p>
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<p>
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<label for="authcode"><?php esc_html_e( 'Authentication Code:', 'two-factor' ); ?></label>
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<input type="text" inputmode="numeric" autocomplete="one-time-code" name="authcode" id="authcode" class="input authcode" value="" size="20" pattern="[0-9 ]*" placeholder="123 456" data-digits="<?php echo esc_attr( self::DEFAULT_DIGIT_COUNT ); ?>" />
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</p>
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<script type="text/javascript">
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setTimeout( function(){
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var d;
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try{
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d = document.getElementById('authcode');
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d.focus();
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} catch(e){}
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}, 200);
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</script>
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<?php
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submit_button( __( 'Authenticate', 'two-factor' ) );
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}
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/**
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* Returns a base32 encoded string.
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*
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* @param string $string String to be encoded using base32.
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*
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* @return string base32 encoded string without padding.
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*/
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public static function base32_encode( $string ) {
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if ( empty( $string ) ) {
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return '';
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}
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$binary_string = '';
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foreach ( str_split( $string ) as $character ) {
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$binary_string .= str_pad( base_convert( ord( $character ), 10, 2 ), 8, '0', STR_PAD_LEFT );
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}
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$five_bit_sections = str_split( $binary_string, 5 );
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$base32_string = '';
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foreach ( $five_bit_sections as $five_bit_section ) {
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$base32_string .= self::$base_32_chars[ base_convert( str_pad( $five_bit_section, 5, '0' ), 2, 10 ) ];
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}
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return $base32_string;
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}
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/**
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* Decode a base32 string and return a binary representation
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*
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* @param string $base32_string The base 32 string to decode.
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*
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* @throws Exception If string contains non-base32 characters.
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*
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* @return string Binary representation of decoded string
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*/
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public static function base32_decode( $base32_string ) {
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$base32_string = strtoupper( $base32_string );
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if ( ! preg_match( '/^[' . self::$base_32_chars . ']+$/', $base32_string, $match ) ) {
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throw new Exception( 'Invalid characters in the base32 string.' );
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}
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$l = strlen( $base32_string );
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$n = 0;
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$j = 0;
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$binary = '';
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for ( $i = 0; $i < $l; $i++ ) {
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$n = $n << 5; // Move buffer left by 5 to make room.
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$n = $n + strpos( self::$base_32_chars, $base32_string[ $i ] ); // Add value into buffer.
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$j += 5; // Keep track of number of bits in buffer.
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if ( $j >= 8 ) {
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$j -= 8;
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$binary .= chr( ( $n & ( 0xFF << $j ) ) >> $j );
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}
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}
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return $binary;
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}
|
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|
|
/**
|
|
* Used with usort to sort an array by distance from 0
|
|
*
|
|
* @param int $a First array element.
|
|
* @param int $b Second array element.
|
|
*
|
|
* @return int -1, 0, or 1 as needed by usort
|
|
*/
|
|
private static function abssort( $a, $b ) {
|
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$a = abs( $a );
|
|
$b = abs( $b );
|
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if ( $a === $b ) {
|
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return 0;
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}
|
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return ( $a < $b ) ? -1 : 1;
|
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}
|
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}
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