global.php

'acl' => array(
    'roles' => array(
        'visitante'   => null,
        'redator'  => 'visitante',
        'admin' => 'redator'
    ),
    'resources' => array(
        'Application\Controller\Index.index',
        'Admin\Controller\Index.save',
        'Admin\Controller\Index.delete',
        'Admin\Controller\Auth.index',
        'Admin\Controller\Auth.login',
        'Admin\Controller\Auth.logout',
    ),
    'privilege' => array(
        'visitante' => array(
            'allow' => array(
                'Application\Controller\Index.index',
                'Admin\Controller\Auth.index',
                'Admin\Controller\Auth.login',
                'Admin\Controller\Auth.logout',
            )
        ),
        'redator' => array(
            'allow' => array(
                'Admin\Controller\Index.save',
            )
        ),
        'admin' => array(
            'allow' => array(
                'Admin\Controller\Index.delete',
            )
        ),
    )
)