JekaRu

http://symfony.com/doc/current/cookbook/configuration/override_dir_structure.html#override-the-web-directory

class MyPropertyService{
  private $property1;
  // ....
  public function __construct(EntityManager $em){
    // ваш код  инициализации
    // $this->property1 = ...
  }
//...
}

<service id="my.property.service" class="Acme\SuperBundle\Services\MyPropertyService">
      <argument type="service" id="doctrine.orm.default_entity_manager"/>
</service>

{% if link.sublink is defined and link.sublink|length>0 %}

class AutenticatorListener
{
    private $securityContext;
    private $firewall;

    public function __construct(SecurityContext $securityContext, $firewall)
    {
        $this->securityContext = $securityContext;
        $this->firewall        = $firewall;
    }

    public function checkLogin(GetResponseEvent $event)
    {
        if (HttpKernel::SUB_REQUEST == $event->getRequestType()) {
            return;
        }

        $request = $event->getRequest();
        // ...  ваш код
        //....
        //....

        $token = new UsernamePasswordToken($user, null, $this->firewall, $user->getRoles());
        $this->securityContext->setToken($token);
    }
}