UserIdentity.php

<?php
class UserIdentity extends CUserIdentity
{
    private $id;
    
    public function authenticate()
    {
        $model = User::model()->findByAttributes(array(
            'username' => $this->username,
        ));
        
        $ph = new PasswordHash(
            Yii::app()->params['iteration_count_log2'],
            Yii::app()->params['portable_hashes']
        );
        
        if (!$model) {
            $this->errorCode = self::ERROR_USERNAME_INVALID;

        } else if (!$ph->CheckPassword($this->password, $model->password)) {
            $this->errorCode = self::ERROR_PASSWORD_INVALID;

        } else {
            $this->id = $model->id;
            $this->errorCode = self::ERROR_NONE;
        }
        
        return !$this->errorCode;
    }
    
    public function getId()
    {
        return $this->id;
    }
}