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<?php
namespace Bitrix\Main\Security\Mfa;
use Bitrix\Main\Config\Option;
use Bitrix\Main\ArgumentOutOfRangeException;
use Bitrix\Main\Security\OtpException;
use Bitrix\Main\Localization\Loc;
Loc::loadMessages(__FILE__);
class TotpAlgorithm extends OtpAlgorithm
{
const SYNC_WINDOW = 180;
protected static $type = 'totp';
protected $interval = 30;
// ToDo: option here! May be just merge with HOTP window?
protected $window = 2;
protected $requireTwoCode = false;
public function __construct()
{
$interval = (int) Option::get('security', 'totp_interval');
if ($interval && $interval > 0)
$this->interval = $interval;
}
/**
* @inheritDoc
*/
public function verify($input, $params = null, $time = null)
{
$input = (string) $input;
if($params === null)
{
$params = '0:0';
}
if (!preg_match('#^\d+$#D', $input))
throw new ArgumentOutOfRangeException('input', 'string with numbers');
list($userOffset, $lastTimeCode) = explode(':', $params);
$userOffset = (int) $userOffset;
$lastTimeCode = (int) $lastTimeCode;
if ($time === null)
$timeCode = $this->timecode(time());
else
$timeCode = $this->timecode((int) $time);
$checkOffsets = array();
// First of all we must check input for provided offset
$checkOffsets[] = $userOffset;
if ($userOffset)
{
// If we failed on previous step and have user offset - try current time, may be user syncing time on device
$checkOffsets[] = 0;
}
if ($this->window)
{
// Otherwise, try deal with clock drifting
$checkOffsets = array_merge(
$checkOffsets,
range($userOffset - $this->window, $userOffset + $this->window)
);
}
$isSuccess = false;
$resultOffset = 0;
$resultTimeCode = 0;
foreach($checkOffsets as $offset)
{
$code = $timeCode + $offset;
// Disallow authorization in the past. Must prevent replay attacks.
if ($lastTimeCode && $code <= $lastTimeCode)
continue;
if ($this->isStringsEqual($input, $this->generateOTP($code)))
{
$isSuccess = true;
$resultOffset = $offset;
$resultTimeCode = $code;
break;
}
}
if ($isSuccess === true)
return array($isSuccess, sprintf('%d:%d', $resultOffset, $resultTimeCode));
return array($isSuccess, null);
}
/**
* @inheritDoc
*/
public function generateUri($label, array $opts = array())
{
$opts += array('period' => $this->getInterval());
return parent::generateUri($label, $opts);
}
/**
* Make OTP counter from provided timestamp
*
* @param int $timestamp Timestamp.
* @return int
*/
public function timecode($timestamp)
{
return (int) ( (((int) $timestamp * 1000) / ($this->getInterval() * 1000)));
}
/**
* @param int $interval
* @return $this
*/
public function setInterval($interval)
{
$this->interval = (int)$interval;
return $this;
}
/**
* Return used interval in counter generation
*
* @return int
*/
protected function getInterval()
{
return $this->interval;
}
/**
* @param int $window
* @return $this
*/
public function setWindow($window)
{
$this->window = (int)$window;
return $this;
}
/**
* @inheritDoc
*/
public function getSyncParameters($inputA, $inputB)
{
$offset = 0;
$this->window = 0;
$isSuccess = false;
if (!$isSuccess)
{
// Before detect clock drift we must check current time :-)
list($isSuccess,) = $this->verify($inputA, $offset);
}
if (!$isSuccess)
{
// Otherwise try to calculate resynchronization
$offset = -self::SYNC_WINDOW;
for($i = $offset; $i < self::SYNC_WINDOW; $i++)
{
list($isSuccess,) = $this->verify($inputA, $offset);
if ($isSuccess)
{
break;
}
$offset++;
}
}
if ($offset === self::SYNC_WINDOW)
throw new OtpException('Cannot synchronize this secret key with the provided password values.');
return sprintf('%d:%d', $offset, 0);
}
}