Login

#db
CREATE TABLE IF NOT EXISTS users (
  id int(11) NOT NULL AUTO_INCREMENT,
  username varchar(50) NOT NULL,
  password varchar(50) NOT NULL,
  salt varchar(50) NOT NULL,
  role varchar(50) NOT NULL,
  date_created datetime NOT NULL,
  PRIMARY KEY (id)
)
INSERT INTO users (username, password, salt, role, date_created)
VALUES ('admin', SHA1('passwordce8d96d579d389e783f95b3772785783ea1a9854'),
	'ce8d96d579d389e783f95b3772785783ea1a9854', 'administrator', NOW());
//to improve security, we are using a "salt" value with the password that the user uses to log in with


#Application/modules/user/controllers/AuthController.php
<?php
class User_AuthController extends Zend_Controller_Action {

	public function indexAction() {
		
		$form = new Forms_Login();

		$request = $this->getRequest();
		
		if ($request->isPost()) {
			
			if ($form->isValid($request->getPost())) {
				
				$data = $form->getValues();
				
				$db = Zend_Registry::get('dbAdapter');
				$authAdapter = new Zend_Auth_Adapter_DbTable($db);
				$authAdapter->setTableName('user')
							->setIdentityColumn('username')
							->setCredentialColumn('password')
							->setCredentialTreatment('SHA1(CONCAT(?, salt))')
				;
				$authAdapter->setIdentity($data['username']);
				$authAdapter->setCredential($data['password']);

				$result = Zend_Auth::getInstance()->authenticate($authAdapter);

				if ($result) {
					switch($result->getCode()) {
						case Zend_Auth_Result::FAILURE_IDENTITY_NOT_FOUND:
							echo 'identity not found';
							break;
						case Zend_Auth_Result::FAILURE_CREDENTIAL_INVALID:
							echo 'wrong password';
							break;
						case Zend_Auth_Result::SUCCESS:
							$this->_redirect(_APP_URL . '/default/frontend/index');
							break;
						default:
							echo 'auth failed';
							break;
					}
				}
			}
		}
		$this->view->loginForm = $form;
	}
}

#Application/modules/user/Forms/Login.php
<?php
class Forms_Login extends Zend_Form {
	
	public function init()
    {
        $this->setName("login");
        $this->setMethod('post');
             
        $this->addElement('text', 'username', array(
            'filters'    => array('StringTrim', 'StringToLower'),
            'validators' => array(
                array('StringLength', false, array(0, 50)),
            ),
            'required'   => true,
            'label'      => 'Username:',
        ));

        $this->addElement('password', 'password', array(
            'filters'    => array('StringTrim'),
            'validators' => array(
                array('StringLength', false, array(0, 50)),
            ),
            'required'   => true,
            'label'      => 'Password:',
        ));

        $this->addElement('submit', 'login', array(
            'required' => false,
            'ignore'   => true,
            'label'    => 'Login',
        ));        
    }

}

#Application/modules/user/views/scripts/auth/login.phtml
<?php 
echo $this->loginForm;

#login url
http://zfsite/user/auth