authelia/docs/content/en/integration/openid-connect/tailscale/index.md

---
title: "Tailscale"
description: "Using Authelia as the Tailscale OpenID Connect Provider."
lead: ""
date: 2023-04-23T10:06:28+10:00
draft: false
images: []
menu:
  integration:
    parent: "openid-connect"
weight: 620
toc: true
community: true
---

## Tested Versions

* [Authelia]
  * [v4.37.5](https://github.com/authelia/authelia/releases/tag/v4.37.5)
* [Tailscale] - **Note:** Version not important, since configuration is via the WebUI
  * [1.38.4](https://github.com/tailscale/tailscale/releases/tag/v1.38.4)

## Before You Begin

{{% oidc-common %}}

### Assumptions

This example makes the following assumptions:

* __Domain Root URL:__ `https://example.com`
* __Authelia Root URL:__ `https://auth.example.com`
* __Authelia Account:__ `user@example.com`
* __Client ID:__ `tailscale`
* __Client Secret:__ `insecure_secret`


## Configuration
The configuration in Authelia is straight forward, Tailscale is just another `identity_provider/oidc` entry.
Tailscale also requires a WebFinger reply for your domain - see the following [Application](#application)
section.


### Application

To configure [Tailscale] to utilize Authelia as a [OpenID Connect 1.0] Provider, you will need a public WebFinger reply
for your domain (see [RFC7033 Section 3.1]) and point it to Authelia. The steps necessary are outlined in the Tailscale
documentation on [Custom OIDC providers KB article]. This WebFinger reply is not generated by Authelia, so your external
webserver hosted at the root of your domain will need to generate the response (Check [See also](#see-also) for example
implementations). The following steps are necessary to get Tailscale working with Authelia:

1. Your domain will need to reply to a WebFinger request for your Authelia account
2. Your domain root is `example.com` and the Authelia account in question is `user@example.com` the WebFinger request
will be: `https://example.com/.well-known/webfinger/?resource=acct:user@example.com the complete request is `https://example.com/.well-known/webfinger?rel=http%3A%2F%2Fopenid.net%2Fspecs%2Fconnect%2F1.0%2Fissuer&resource=acct%3Auser%40example.com`
3. The WebFinger request needs to be answered with the following example reply:
```json
{
  "subject": "acct:user@example.com",
  "links": [{
    "rel": "http://openid.net/specs/connect/1.0/issuer",
    "href": "https://auth.example.com"
  }]
}
```
4. For any other users that you want to add to Tailscale, you will need to provide similar WebFinger replies (e.g. for `user2@example.com` or `user3@example.com`)
5. Once you have the WebFinger reply set up and your [Authelia OpenID Connect Discovery endpoint](https://www.authelia.com/integration/openid-connect/introduction/#well-known-discovery-endpoints) is working (e.g. `https://auth.example.com/.well-known/openid-configuration`), you can sign up for a **new Tailnet** (migration can only be done if the Tailnet is associated with a custom domain) via the link: [Sign up with OIDC](https://login.tailscale.com/start/oidc) where you will see the following screen: \
{{< figure src="tailscale_signup_1.png" alt="Tailscale Signup Screen 1" width="300" >}} \
**Note:** Even though the WebFinger URL displayed is `https://example.com/.well-known/webfinger`, the actual GET request will be including request parameters, most importantly `resource`.
6. After clicking on **Get OIDC Issuer**, Tailscale will fetch the WebFinger reply via `https://example.com/.well-known/webfinger/?resource=acct:user@example.com` and follow the set `href` to `https://auth.example.com/.well-known/openid-configuration`. \
**Note:** Make sure that the `href` URL matches the `issuer` URL returned from the Authelia OIDC discovery endpoint
7. On the next screen you will need to add your client ID & secret configured in Authelia to finish the OIDC provider registration in [Tailscale]. See the following example screenshot: \
{{< figure src="tailscale_signup_2.png" alt="Tailscale Signup Screen 2" width="300" >}}


### Authelia

The following YAML configuration is an example __Authelia__
[client configuration](../../../configuration/identity-providers/open-id-connect.md#clients) for use with [Tailscale] which
will operate with the above example:

```yaml
identity_providers:
  oidc:
    ## The other portions of the mandatory OpenID Connect 1.0 configuration go here.
    ## See: https://www.authelia.com/c/oidc
    clients:
    - id: tailscale
      description: Tailscale SSO
      secret: '$pbkdf2-sha512$310000$c8p78n7pUMln0jzvd4aK4Q$JNRBzwAo0ek5qKn50cFzzvE9RXV88h1wJn5KGiHrD0YKtZaR/nCb2CJPOsKaPK0hjf.9yHxzQGZziziccp6Yng'  # The digest of 'insecure_secret'.
      redirect_uris:
        - https://login.tailscale.com/a/oauth_response
      scopes:
        - openid
        - email
        - profile
```

## See Also

- [Tailscale] [Custom OIDC providers KB article]
- [RFC7033 Section 3.1] _WebFinger: Identity Provider Discovery for OpenID Connect_
- [WebFinger example implementations](https://webfinger.net/code/)

[Authelia]: https://www.authelia.com
[Tailscale]: https://tailscale.com
[Custom OIDC providers KB article]: https://tailscale.com/kb/1240/sso-custom-oidc/
[RFC7033 Section 3.1]: https://datatracker.ietf.org/doc/html/rfc7033#section-3.1
[OpenID Connect 1.0]: ../../openid-connect/introduction.md