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# OAuth2 Authentication

## Introduction

This is only a supplement to the existing account provisioners

Accounts must still be managed via the configured `ACCOUNT_PROVISIONER` (FILE or LDAP).

Reasoning for this can be found in #3480. Future iterations on this feature may allow it to become a full account provisioner.

The present OAuth2 support provides the capability for 3rd-party applications such as Roundcube to authenticate with DMS (dovecot) by using a token obtained from an OAuth2 provider, instead of passing passwords around.

## Example (Authentik & Roundcube)

This example assumes you have:

- A working DMS server set up
- An Authentik server set up (documentation)
- A Roundcube server set up (either docker or bare metal)

Setup Instructions

1. Docker Mailserver2. Authentik3. Roundcube

Edit the following values in `mailserver.env`:

    # -----------------------------------------------
    # --- OAUTH2 Section ----------------------------
    # -----------------------------------------------

    # empty => OAUTH2 authentication is disabled
    # 1 => OAUTH2 authentication is enabled
    ENABLE_OAUTH2=1

    # Specify the user info endpoint URL of the oauth2 provider
    OAUTH2_INTROSPECTION_URL=https://authentik.example.com/application/o/userinfo/

1. Create a new OAuth2 provider
2. Note the client id and client secret
3. Set the allowed redirect url to the equivalent of `https://roundcube.example.com/index.php/login/oauth` for your RoundCube instance.

Add the following to `oauth2.inc.php` (documentation):

    $config['oauth_provider'] = 'generic';
    $config['oauth_provider_name'] = 'Authentik';
    $config['oauth_client_id'] = '<insert client id here>';
    $config['oauth_client_secret'] = '<insert client secret here>';
    $config['oauth_auth_uri'] = 'https://authentik.example.com/application/o/authorize/';
    $config['oauth_token_uri'] = 'https://authentik.example.com/application/o/token/';
    $config['oauth_identity_uri'] = 'https://authentik.example.com/application/o/userinfo/';

    // Optional: disable SSL certificate check on HTTP requests to OAuth server. For possible values, see:
    // http://docs.guzzlephp.org/en/stable/request-options.html#verify
    $config['oauth_verify_peer'] = false;

    $config['oauth_scope'] = 'email openid profile';
    $config['oauth_identity_fields'] = ['email'];

    // Boolean: automatically redirect to OAuth login when opening Roundcube without a valid session
    $config['oauth_login_redirect'] = false;