authentik/website/docs/flow/index.md

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title: Overview
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Flows are a method of describing a sequence of stages. A stage represents a single verification or logic step. They are used to authenticate users, enroll them, and more.

For example, a standard login flow would consist of the following stages:

-   Identification, user identifies themselves via a username or email address
-   Password, the user's password is checked against the hash in the database
-   Log the user in

Upon flow execution, a plan containing all stages is generated. This means that all attached policies are evaluated upon execution. This behaviour can be altered by enabling the **Re-evaluate Policies** option on the binding.

To determine which flow is linked, authentik searches all flows with the required designation and chooses the first instance the current user has access to.

## Permissions

Flows can have policies assigned to them. These policies determine if the current user is allowed to see and use this flow.

Keep in mind that in certain circumstances, policies cannot match against users and groups as there is no authenticated user yet.

### Denied action

Configure what happens when access to a flow is denied by a policy. By default, authentik will redirect to a `?next` parameter if set, and otherwise show an error message.

-   `MESSAGE_CONTINUE`: Show a message if no `?next` parameter is set, otherwise redirect.
-   `MESSAGE`: Always show error message.
-   `CONTINUE`: Always redirect, either to `?next` if set, otherwise to the default interface.

## Designation

Flows are designated for a single purpose. This designation changes when a flow is used. The following designations are available:

### Authentication

This is designates a flow to be used for authentication.

The authentication flow should always contain a [**User Login**](stages/user_login.md) stage, which attaches the staged user to the current session.

### Invalidation

This designates a flow to be used to invalidate a session.

This stage should always contain a [**User Logout**](stages/user_logout.md) stage, which resets the current session.

### Enrollment

This designates a flow for enrollment. This flow can contain any amount of verification stages, such as [**email**](stages/email/) or [**captcha**](stages/captcha/). At the end, to create the user, you can use the [**user_write**](stages/user_write.md) stage, which either updates the currently staged user, or if none exists, creates a new one.

### Unenrollment

This designates a flow for unenrollment. This flow can contain any amount of verification stages, such as [**email**](stages/email/) or [**captcha**](stages/captcha/). As a final stage, to delete the account, use the [**user_delete**](stages/user_delete.md) stage.

### Recovery

This designates a flow for recovery. This flow normally contains an [**identification**](stages/identification/) stage to find the user. It can also contain any amount of verification stages, such as [**email**](stages/email/) or [**captcha**](stages/captcha/).
Afterwards, use the [**prompt**](stages/prompt/) stage to ask the user for a new password and the [**user_write**](stages/user_write.md) stage to update the password.

### Stage configuration

This designates a flow for general setup. This designation doesn't have any constraints in what you can do. For example, by default this designation is used to configure Factors, like change a password and setup TOTP.