Login.php

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<?php
namespace Magento\Backend\Controller\Adminhtml\Auth;

use Magento\Framework\App\Action\HttpGetActionInterface as HttpGet;
use Magento\Framework\App\Action\HttpPostActionInterface as HttpPost;

class Login extends \Magento\Backend\Controller\Adminhtml\Auth implements HttpGet, HttpPost
{
    protected $resultPageFactory;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory
    ) {
        $this->resultPageFactory = $resultPageFactory;
        parent::__construct($context);
    }

    public function execute()
    {
        if ($this->_auth->isLoggedIn()) {
            if ($this->_auth->getAuthStorage()->isFirstPageAfterLogin()) {
                $this->_auth->getAuthStorage()->setIsFirstPageAfterLogin(true);
            }
            return $this->getRedirect($this->_backendUrl->getStartupPageUrl());
        }

        $requestUrl = $this->getRequest()->getUri();
        $backendUrl = $this->getUrl('*');
        // redirect according to rewrite rule
        if ($requestUrl != $backendUrl) {
            return $this->getRedirect($backendUrl);
        }
        return $this->resultPageFactory->create();
    }

    private function getRedirect($path)
    {
        $resultRedirect = $this->resultRedirectFactory->create();
        $resultRedirect->setPath($path);
        return $resultRedirect;
    }
}