Expression Policies

The passing of the policy is determined by the return value of the code. Use

return True

to pass a policy and

return False

to fail it.

Available Functions

ak_message(message: str)

Add a message, visible by the end user. This can be used to show the reason why they were denied.

Example:

ak_message("Access denied")
return False

ak_user_has_authenticator(user: User, device_type: Optional[str] = None) -> bool (2021.9+)

Check if a user has any authenticator devices. Only fully validated devices are counted.

Optionally, you can filter a specific device type. The following options are valid:

• totp
• duo
• static
• webauthn

Example:

return ak_user_has_authenticator(request.user)

ak_call_policy(name: str, **kwargs) -> PolicyResult (2021.12+)

Call another policy with the name name. Current request is passed to policy. Key-word arguments can be used to modify the request's context.

Example:

result = ak_call_policy("test-policy")
# result is a PolicyResult object, so you can access `.passing` and `.messages`.
return result.passing

result = ak_call_policy("test-policy-2", foo="bar")
# Inside the `test-policy-2` you can then use `request.context["foo"]`
return result.passing

regex_match(value: Any, regex: str) -> bool

Check if value matches Regular Expression regex.

Example:

return regex_match(request.user.username, '.*admin.*')

regex_replace(value: Any, regex: str, repl: str) -> str

Replace anything matching regex within value with repl and return it.

Example:

user_email_local = regex_replace(request.user.email, '(.+)@.+', '')

list_flatten(value: list[Any] | Any) -> Optional[Any}

Flatten a list by either returning its first element, None if the list is empty, or the passed in object if its not a list.

Example:

user = list_flatten(["foo"])
# user = "foo"

ak_is_group_member(user: User, **group_filters) -> bool

Check if user is member of a group matching **group_filters.

Example:

return ak_is_group_member(request.user, name="test_group")

ak_user_by(**filters) -> Optional[User]

Fetch a user matching **filters.

Returns "None" if no user was found, otherwise User

Example:

other_user = ak_user_by(username="other_user")

Comparing IP Addresses

To compare IP Addresses or check if an IP Address is within a given subnet, you can use the functions ip_address('192.0.2.1') and ip_network('192.0.2.0/24'). With these objects you can do arithmetic operations.

You can also check if an IP Address is within a subnet by writing the following:

ip_address('192.0.2.1') in ip_network('192.0.2.0/24')
# evaluates to True

Variables

• ak_logger: structlog BoundLogger. See (structlog documentation)

  Example:

  ak_logger.debug("This is a test message")
  ak_logger.warning("This will be logged with a warning level")
  ak_logger.info("Passing structured data", request=request)

• requests: requests Session object. See (request documentation)

• request: A PolicyRequest object, which has the following properties:

  • request.user: The current user, against which the policy is applied. See User
  • request.http_request: The Django HTTP Request. See (Django documentation)
  • request.obj: A Django Model instance. This is only set if the policy is ran against an object.
  • request.context: A dictionary with dynamic data. This depends on the origin of the execution.

• geoip: GeoIP object, which is added when GeoIP is enabled. See GeoIP

• ak_is_sso_flow: Boolean which is true if request was initiated by authenticating through an external provider.

• ak_client_ip: Client's IP Address or 255.255.255.255 if no IP Address could be extracted. Can be compared, for example

  return ak_client_ip in ip_network('10.0.0.0/24')
  # or
  return ak_client_ip.is_private

  See also Python documentation

Additionally, when the policy is executed from a flow, every variable from the flow's current context is accessible under the context object.

This includes the following:

• context['prompt_data']: Data which has been saved from a prompt stage or an external source.

• context['application']: The application the user is in the process of authorizing.

• context['pending_user']: The currently pending user, see User

• context['auth_method']: Authentication method set (this value is set by password stages)

  Depending on method, context['auth_method_args'] is also set.

  Can be any of:

  • password: Standard password login

  • app_password: App password (token)

    Sets context['auth_method_args'] to

    {
        "token": {
            "pk": "f6d639aac81940f38dcfdc6e0fe2a786",
            "app": "authentik_core",
            "name": "test (expires=2021-08-23 15:45:54.725880+00:00)",
            "model_name": "token"
        }
    }

  • ldap: LDAP bind authentication

    Sets context['auth_method_args'] to

    {
        "source": {} // Information about the source used
    }