form | Python Fiddle

class CustomAdminAuthenticationForm(AuthenticationForm):
    """
    A custom authentication form used in the admin app.

"""
    this_is_the_login_form = forms.BooleanField(widget=forms.HiddenInput, initial=1,
                                                error_messages={'required': LOGIN_SESSION_EXPIRED})

def clean(self):
        username = self.cleaned_data.get('username')
        password = self.cleaned_data.get('password')
        ad_server = settings.AD_SERVER
        message = ERROR_MESSAGE_LOGIN
        params = {'username': self.username_field.verbose_name}
        result = None
        if username and password:
            try:
                active_directory = SimpleLDAP(ad_server, username, password)
                result = active_directory.login()
            except (ValueError, Exception) as e:
                logging.info(e)
            if result:
                if result is -1:
                    logging.info(message)
                else:
                    try:
                        self.user_cache = CustomUser.objects.get(username=username)
                        self.user_cache.backend = 'django.contrib.auth.backends.ModelBackend'
                    except CustomUser.DoesNotExist as e:
                        logging.info(e)
            if not self.user_cache:
                self.user_cache = authenticate(username=username, password=password)
                print self.user_cache
                print self.user_cache.is_active
                print self.user_cache.is_staff
                if self.user_cache is None:
                    raise forms.ValidationError(message, code='invalid', params=params)
                elif not self.user_cache.is_active or not self.user_cache.is_staff:
                    raise forms.ValidationError(message, code='invalid', params=params)
        return self.cleaned_data

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