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<?php
/**
 * @package     Joomla.Plugin
 * @subpackage  Authentication.joomla
 *
 * @copyright   (C) 2006 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

use Joomla\CMS\Authentication\Authentication;
use Joomla\CMS\Helper\AuthenticationHelper;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Plugin\CMSPlugin;
use Joomla\CMS\Plugin\PluginHelper;
use Joomla\CMS\User\User;
use Joomla\CMS\User\UserHelper;

/**
 * Joomla Authentication plugin
 *
 * @since  1.5
 */
class PlgAuthenticationJoomla extends CMSPlugin
{
	/**
	 * Application object
	 *
	 * @var    \Joomla\CMS\Application\CMSApplication
	 * @since  4.0.0
	 */
	protected $app;

/**
	 * Database object
	 *
	 * @var    \Joomla\Database\DatabaseDriver
	 * @since  4.0.0
	 */
	protected $db;

/**
	 * This method should handle any authentication and report back to the subject
	 *
	 * @param   array   $credentials  Array holding the user credentials
	 * @param   array   $options      Array of extra options
	 * @param   object  &$response    Authentication response object
	 *
	 * @return  void
	 *
	 * @since   1.5
	 */
	public function onUserAuthenticate($credentials, $options, &$response)
	{
		$response->type = 'Joomla';

// Joomla does not like blank passwords
		if (empty($credentials['password']))
		{
			$response->status        = Authentication::STATUS_FAILURE;
			$response->error_message = Text::_('JGLOBAL_AUTH_EMPTY_PASS_NOT_ALLOWED');

return;
		}

$db    = $this->db;
		$query = $db->getQuery(true)
			->select($db->quoteName(['id', 'password']))
			->from($db->quoteName('#__users'))
			->where($db->quoteName('username') . ' = :username')
			->bind(':username', $credentials['username']);

$db->setQuery($query);
		$result = $db->loadObject();

if ($result)
		{
			$match = UserHelper::verifyPassword($credentials['password'], $result->password, $result->id);

if ($match === true)
			{
				// Bring this in line with the rest of the system
				$user               = User::getInstance($result->id);
				$response->email    = $user->email;
				$response->fullname = $user->name;

if ($this->app->isClient('administrator'))
				{
					$response->language = $user->getParam('admin_language');
				}
				else
				{
					$response->language = $user->getParam('language');
				}

$response->status        = Authentication::STATUS_SUCCESS;
				$response->error_message = '';
			}
			else
			{
				// Invalid password
				$response->status        = Authentication::STATUS_FAILURE;
				$response->error_message = Text::_('JGLOBAL_AUTH_INVALID_PASS');
			}
		}
		else
		{
			// Let's hash the entered password even if we don't have a matching user for some extra response time
			// By doing so, we mitigate side channel user enumeration attacks
			UserHelper::hashPassword($credentials['password']);

// Invalid user
			$response->status        = Authentication::STATUS_FAILURE;
			$response->error_message = Text::_('JGLOBAL_AUTH_NO_USER');
		}

// Check the two factor authentication
		if ($response->status === Authentication::STATUS_SUCCESS)
		{
			$methods = AuthenticationHelper::getTwoFactorMethods();

if (count($methods) <= 1)
			{
				// No two factor authentication method is enabled
				return;
			}

$model = $this->app->bootComponent('com_users')->getMVCFactory()->createModel('User', 'Administrator', ['ignore_request' => true]);

// Load the user's OTP (one time password, a.k.a. two factor auth) configuration
			if (!array_key_exists('otp_config', $options))
			{
				$otpConfig             = $model->getOtpConfig($result->id);
				$options['otp_config'] = $otpConfig;
			}
			else
			{
				$otpConfig = $options['otp_config'];
			}

// Check if the user has enabled two factor authentication
			if (empty($otpConfig->method) || ($otpConfig->method === 'none'))
			{
				// Warn the user if they are using a secret code but they have not
				// enabled two factor auth in their account.
				if (!empty($credentials['secretkey']))
				{
					try
					{
						$this->loadLanguage();

$this->app->enqueueMessage(Text::_('PLG_AUTHENTICATION_JOOMLA_ERR_SECRET_CODE_WITHOUT_TFA'), 'warning');
					}
					catch (Exception $exc)
					{
						// This happens when we are in CLI mode. In this case
						// no warning is issued
						return;
					}
				}

return;
			}

// Try to validate the OTP
			PluginHelper::importPlugin('twofactorauth');

$otpAuthReplies = $this->app->triggerEvent('onUserTwofactorAuthenticate', array($credentials, $options));

$check = false;

/*
			 * This looks like noob code but DO NOT TOUCH IT and do not convert
			 * to in_array(). During testing in_array() inexplicably returned
			 * null when the OTEP begins with a zero! o_O
			 */
			if (!empty($otpAuthReplies))
			{
				foreach ($otpAuthReplies as $authReply)
				{
					$check = $check || $authReply;
				}
			}

// Fall back to one time emergency passwords
			if (!$check)
			{
				// Did the user use an OTEP instead?
				if (empty($otpConfig->otep))
				{
					if (empty($otpConfig->method) || ($otpConfig->method === 'none'))
					{
						// Two factor authentication is not enabled on this account.
						// Any string is assumed to be a valid OTEP.

return;
					}
					else
					{
						/*
						 * Two factor authentication enabled and no OTEPs defined. The
						 * user has used them all up. Therefore anything they enter is
						 * an invalid OTEP.
						 */
						$response->status        = Authentication::STATUS_FAILURE;
						$response->error_message = Text::_('JGLOBAL_AUTH_INVALID_SECRETKEY');

return;
					}
				}

// Clean up the OTEP (remove dashes, spaces and other funny stuff
				// our beloved users may have unwittingly stuffed in it)
				$otep  = $credentials['secretkey'];
				$otep  = filter_var($otep, FILTER_SANITIZE_NUMBER_INT);
				$otep  = str_replace('-', '', $otep);
				$check = false;

// Did we find a valid OTEP?
				if (in_array($otep, $otpConfig->otep))
				{
					// Remove the OTEP from the array
					$otpConfig->otep = array_diff($otpConfig->otep, array($otep));

$model->setOtpConfig($result->id, $otpConfig);

// Return true; the OTEP was a valid one
					$check = true;
				}
			}

if (!$check)
			{
				$response->status        = Authentication::STATUS_FAILURE;
				$response->error_message = Text::_('JGLOBAL_AUTH_INVALID_SECRETKEY');
			}
		}
	}
}