code: def check_all_permissions(sender, **kwargs):
      
      if not is_permissions_app(sender):
          return
  
      config = getattr(settings, 'PERMISSIONS', dict())
  
      # for each of our items
      for natural_key, permissions in config.items():
          # if the natural key '*' then that means add to all objects
          if natural_key == '*':
              # for each of our content types
              for content_type in ContentType.objects.all():
                  for permission in permissions:
                      add_permission(content_type, permission)
  
          # otherwise, this is on a specific content type, add for each of those
          else:
              app, model = natural_key.split('.')
              try:
                  content_type = ContentType.objects.get_by_natural_key(app, model)
              except ContentType.DoesNotExist:
                  continue
  
              # add each permission
              for permission in permissions:
                  add_permission(content_type, permission)
docs: This syncdb checks our PERMISSIONS setting in settings.py and makes sure all those permissions
      actually exit.