Symfony2:如何检查某个操作是否安全？

Question

我想从控制器内部检查它是否是一个安全的页面.这该怎么做 ？

我的用例如下:

• 用户可以注册并登录
• 如果他登录并尝试访问受保护的页面,他将被重定向到"测试版"页面,直到6月底.
• 如果他试图访问普通页面(不安全),他将能够访问它而无需任何重定向.

谢谢你的帮助 !

斯坦

Answer 1

当Symfony2处理请求时,它与url模式匹配,其中定义了每个防火墙app/config/security.yml.当url模式与防火墙模式匹配时,Symfony2会创建一些侦听器对象并调用handle这些对象的方法.如果任何侦听器返回一个Response对象,则循环中断,Symfony2输出响应.身份验证部分在身份验证侦听器中完成.它们是从匹配防火墙中定义的配置创建的,例如form_login,http_basic等等.如果用户未经过身份验证,则经过身份验证的侦听器会创建一个RedirectResponse对象,以将用户重定向到登录页面 对于您的情况,您可以通过创建自定义身份验证侦听器并将其添加到安全页面防火墙中来作弊.样本实施如下,

创建一个Token类,

namespace Your\Namespace;

use Symfony\Component\Security\Core\Authentication\Token\AbstractToken;

class MyToken extends AbstractToken
{
    public function __construct(array $roles = array())
    {
        parent::__construct($roles);
    }

    public function getCredentials()
    {
        return '';
    }
}

创建一个实现的类AuthenticationProviderInterface.对于form_login监听器,它使用给定的身份验证UserProvider.在这种情况下,它什么都不做.

namespace Your\Namespace;

use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
use Symfony\Component\Security\Core\Authentication\Provider\AuthenticationProviderInterface;
use Acme\BaseBundle\Firewall\MyToken;

class MyAuthProvider implements AuthenticationProviderInterface
{

    public function authenticate(TokenInterface $token)
    {
        if (!$this->supports($token)) {
            return null;
        }

        throw new \Exception('you should not get here');
    }

    public function supports(TokenInterface $token)
    {
        return $token instanceof MyToken;
    }

创建入口点类.监听器RedirectResponse将从此类创建一个.

namespace Your\Namespace;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Security\Core\Exception\AuthenticationException;
use Symfony\Component\Security\Http\EntryPoint\AuthenticationEntryPointInterface;
use Symfony\Component\Security\Http\HttpUtils;


class MyAuthenticationEntryPoint implements AuthenticationEntryPointInterface
{
    private $httpUtils;
    private $redirectPath;

    public function __construct(HttpUtils $httpUtils, $redirectPath)
    {
        $this->httpUtils = $httpUtils;
        $this->redirectPath = $redirectPath;
    }

    /**
     * {@inheritdoc}
     */
    public function start(Request $request, AuthenticationException $authException = null)
    {
        //redirect action goes here
        return $this->httpUtils->createRedirectResponse($request, $this->redirectPath);
    }

创建一个监听器类.在这里,您将实现重定向逻辑.

namespace Your\Namespace;

use Symfony\Component\Security\Http\Firewall\ListenerInterface;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\Security\Core\SecurityContextInterface;
use Symfony\Component\Security\Http\EntryPoint\AuthenticationEntryPointInterface;

class MyAuthenticationListener implements ListenerInterface
{
    private $securityContext;
    private $authenticationEntryPoint;


    public function __construct(SecurityContextInterface $securityContext, AuthenticationEntryPointInterface $authenticationEntryPoint)
    {
        $this->securityContext = $securityContext;
        $this->authenticationEntryPoint = $authenticationEntryPoint;
    }

    public function handle(GetResponseEvent $event)
    {
        $token = $this->securityContext->getToken();
        $request = $event->getRequest();
        if($token === null){
            return;
        }

        //add your logic
        $redirect = // boolean value based on your logic

        if($token->isAuthenticated() && $redirect){

            $response = $this->authenticationEntryPoint->start($request);
            $event->setResponse($response);
            return;
        }
    }

}

创建服务.

<?xml version="1.0" ?>
<container xmlns="http://symfony.com/schema/dic/services"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <services>

        <service id="my_firewall.security.authentication.listener"
                 class="Your\Namespace\MyAuthenticationListener"
                 parent="security.authentication.listener.abstract"
                 abstract="true">
            <argument type="service" id="security.context" />
            <argument /> <!-- Entry Point -->
        </service>

        <service id="my_firewall.entry_point" class="Your\Namespace\MyAuthenticationEntryPoint" public="false" ></service>

        <service id="my_firewall.auth_provider" class="Your\Namespace\MyAuthProvider" public="false"></service>
    </services>

</container>

注册听众.创建Security/Factorybundles DependencyInjection文件夹中指定的文件夹.然后创建工厂类.

namespace Your\Bundle\DependencyInjection\Security\Factory;

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Reference;
use Symfony\Component\DependencyInjection\DefinitionDecorator;
use Symfony\Component\DependencyInjection\Definition;
use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\Factory\SecurityFactoryInterface;
use Symfony\Component\Config\Definition\Builder\NodeDefinition;

class MyFirewallFactory implements SecurityFactoryInterface
{

    public function create(ContainerBuilder $container, $id, $config, $userProvider, $defaultEntryPoint)
    {
        $provider = 'my_firewall.auth_provider.'.$id;
        $container->setDefinition($provider, new DefinitionDecorator('my_firewall.auth_provider'));

        // entry point
        $entryPointId = $this->createEntryPoint($container, $id, $config, $defaultEntryPoint);

        // listener
        $listenerId = 'my_firewall.security.authentication.listener'.$id;
        $listener = $container->setDefinition($listenerId, new DefinitionDecorator('my_firewall.security.authentication.listener'));
        $listener->replaceArgument(1, new Reference($entryPointId));
        return array($provider, $listenerId, $entryPointId);
    }

    public function getPosition()
    {
        return 'pre_auth';
    }

    public function getKey()
    {
        return 'my_firewall'; //the listener name
    }

    protected function getListenerId()
    {
        return 'my_firewall.security.authentication.listener';
    }

    public function addConfiguration(NodeDefinition $node)
    {
        $node
            ->children()
                ->scalarNode('redirect_path')->end()
            ->end()
            ;
    }

    protected function createEntryPoint($container, $id, $config, $defaultEntryPointId)
    {
        $entryPointId = 'my_firewall.entry_point'.$id;
        $container
            ->setDefinition($entryPointId, new DefinitionDecorator('my_firewall.entry_point'))
            ->addArgument(new Reference('security.http_utils'))
            ->addArgument($config['redirect_path'])
            ;
        return $entryPointId;
    }

}

然后在您NamespaceBundle.php的bundle文件夹中添加以下代码.

public function build(ContainerBuilder $builder){
    parent::build($builder);
    $extension = $builder->getExtension('security');
    $extension->addSecurityListenerFactory(new Security\Factory\MyFirewallFactory());
}

身份验证监听器已创建,phew :).现在在你app/config/security.yml做以下.

api_area:
  pattern: ^/secured/
  provider: fos_userbundle
  form_login:
    check_path: /login_check
    login_path: /login
    csrf_provider: form.csrf_provider
  my_firewall:
    redirect_path: /beta
  logout: true
  anonymous: true