WebUser.php

<?php
class WebUser extends CWebUser
{
    protected function afterLogin($fromCookie)
    {
        $model = User::model()->findByPk(Yii::app()->user->id);
        $model->last_ip = Yii::app()->request->userHostAddress;
        $model->last_login = new CDbExpression('NOW()');
        $model->save(true, array('last_ip', 'last_login'));
    }
    ...