Some identity providers (auth0 for example) do not allow to set the
groups claims and administrators must use custom claims names and add
them in the id token.
This commit adds the following configuration options:
- `oidc.groups_claim` to set the groups claim name
- `oidc.email_claim` to set the email claim name
All claims default to the previous values for backwards compatibility.
The groups claim can now also accept `[]string` or `string` as some
providers might return only a string response instead of array.
Previously, Headscale would only use the `email` OIDC
claim to set the Headscale user. In certain cases
(self-hosted SSO), it may be useful to instead use the
`preferred_username` to set the Headscale username.
This also closes #938.
This adds a config setting to use this claim instead.
The OIDC docs have been updated to include this entry as well.
In addition, this adds an Authelia OIDC example to the docs.
Added OIDC claim integration tests.
Updated the MockOIDC wrapper to take an environment variable that
lets you set the username/email claims to return.
Added two integration tests, TestOIDCEmailGrant and
TestOIDCUsernameGrant, which check the username by checking the FQDN of
clients.
Updated the HTML template shown after OIDC login to show whatever
username is used, based on the Headscale settings.
Currently the most "secret" way to specify the oidc client secret is via
an environment variable `OIDC_CLIENT_SECRET`, which is problematic[1].
Lets allow reading oidc client secret from a file. For extra convenience
the path to the secret will resolve the environment variables.
[1]: https://systemd.io/CREDENTIALS/
