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authentik/website/docs/policies/expression.mdx

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---
title: Expression Policies
---
The passing of the policy is determined by the return value of the code. Use
```python
return True
```
to pass a policy and
```python
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:
```python
ak_message("Access denied")
return False
```
import Functions from '../expressions/_functions.md'
<Functions />
## Variables
import Objects from '../expressions/_objects.md'
<Objects />
- `request`: A PolicyRequest object, which has the following properties:
- `request.user`: The current user, against which the policy is applied. See [User](../expressions/reference/user-object.md)
- `request.http_request`: The Django HTTP Request. See ([Django documentation](https://docs.djangoproject.com/en/3.0/ref/request-response/#httprequest-objects))
- `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](https://geoip2.readthedocs.io/en/latest/#geoip2.models.City)
- `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](#comparing-ip-addresses), for example
```python
return ak_client_ip in ip_network('10.0.0.0/24')
# or
return ak_client_ip.is_private
```
See also [Python documetnation](https://docs.python.org/3/library/ipaddress.html#ipaddress.ip_address)
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:
- `prompt_data`: Data which has been saved from a prompt stage or an external source.
- `application`: The application the user is in the process of authorizing.
- `pending_user`: The currently pending user, see [User](/docs/expressions/reference/user-object)
- `auth_method`: Authentication method set (this value is set by password stages)
Depending on method, `auth_method_args` is also set.
Can be any of:
- `password`: Standard password login
- `app_password`: App passowrd (token)
Sets `auth_method_args` to
```json
{
"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 `auth_method_args` to
```json
{
"source": {} // Information about the source used
}
```