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stack/docs/plans/authentik-sso-setup.md

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# Authentik SSO Setup
## Create the Authentik application
1. In Authentik, create an OAuth2/OpenID Provider.
2. Create an Application and link it to that provider.
3. Copy the generated client ID and client secret.
## Required environment variables
Set these values for the gateway/auth runtime:
```bash
AUTHENTIK_CLIENT_ID=your-client-id
AUTHENTIK_CLIENT_SECRET=your-client-secret
AUTHENTIK_ISSUER=https://authentik.example.com
```
`AUTHENTIK_ISSUER` should be the Authentik base URL, for example `https://authentik.example.com`.
## Redirect URI
Configure this redirect URI in the Authentik provider/application:
```text
{BETTER_AUTH_URL}/api/auth/callback/authentik
```
Example:
```text
https://mosaic.example.com/api/auth/callback/authentik
```
## Test the flow
1. Start the gateway with `BETTER_AUTH_URL` and the Authentik environment variables set.
2. Open the Mosaic login flow and choose the Authentik provider.
3. Complete the Authentik login.
4. Confirm the browser returns to Mosaic and a session is created successfully.