laipower/wp-content/plugins/two-factor/providers/class-two-factor-totp.php

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