Nextcloud Oidc Authelia

Assumptions

If you're here, there are some assumptions being made about access and capabilities you have on your system:

1. You have Authelia up and running, understand its functionality, and have read through the documentation.
2. You have LLDAP up and running.
3. You have Nextcloud and LLDAP communicating and without any config errors. See the example config for Nextcloud

Authelia

Set up Authelia according to its documentation, including the OpenID Connect and Nextcloud instructions.

LLDAP

With LLDAP up and running, add a group and note the name you use. For this tutorial, we're using the group nextcloud_users. Create a new user and add it to the nextcloud_users group.

Optional:

Once setup, add an admin or config user and add to the lldap_strict_readonly or lldap_password_manager group. This will be the config account used for Nextcloud to read your groups and users from the server.

Nextcloud

When we get to the OpenID section, we will be using the same defaults as Authelia's documentation. As a reminder, they are:

• Application Root URL: https://nextcloud.example.com
• Authelia Root URL: https://auth.example.com
• Client ID: nextcloud
• Client Secret: nextcloud_client_secret

Login to your Nextcloud instance as an admin. By now, you should have correctly setup Nextcloud and LLDAP to be communicating and working as expected. See assumptions, above

Next, navigate to the Apps section.

Search for the Nextcloud app Social Login. Enable the app.

Once enabled, navigate to Settings > Administration > Social Login.

You'll see many different options for various auth methods, including major 3rd party integrations. For the top section, check off these three options:

• Allow Users to Connect Social Logins with their Account
• Prevent creating an account if the email address exists in another account
• Update user profile every login

You can test out the other options such as preventing users without a group, but I haven't tested all the options. These are just the ones I know that worked so far.

Scroll down and select Custom OpenID Connect. Fill out the following options:

The first two can be any string you'd like to identify the connection with. The Title is the string that will show up on the button at the login screen and the Internal Name will be used in the Redirect uri. See point 3 in the section below.

Field	Value
Internal Name	Authelia
Title	Authelia OpenID
Authorize URL	https://auth.example.com/api/oidc/authorization
Token URL	https://auth.example.com/api/oidc/token
Display Name Claim (Optional)	display_name
User info URL (Optional)
Logout URL (Optional)
Client ID:	nextcloud
Client Secret:	nextcloud_client_secret
Scope:	openid profile email groups
Groups Claim (Optional)
Button Style	None
Default Group	nextcloud_users

Some Notes

• The scope should be the same as the scope that was setup in Authelia's OpenID Integration. Here's an example from Authelia:

• Do not use commas in the Nextcloud Social Login app scope! This caused many issues for me.
• Be sure you update your Authelia configuration.yml. Specifically, the line: redirect_uris. The new URL should be https://nextcloud.example.com/apps/sociallogin/custom_oidc/Authelia, in some cases the URL also contains the index.php file and has to look like this https://nextcloud.example.com/index.php/apps/sociallogin/custom_oidc/Authelia. Check if your nextcloud has index.php in it's URL because if it has this won't work without and if it hasn't the link with index.php won't work.
  • The final field in the URL (Authelia) needs to be the same value you used in the Social Login "Internal Name" field.
• If you've setup LLDAP correctly in nextcloud, the last dropdown for Default Group should show you the nextcloud_users group you setup in LLDAP.

Once you've filled out the fields correctly, scroll to the bottom and hit save and confirm that you don't recieve any errors from Nextcloud.

Config.php

Lastly, we need to add the following line to your config.php file on your Nextcloud Server.

• 'social_login_auto_redirect' => false,

If this is set to false your login screen will show the standard User/Email and Password input fields with an additional button underneath that should say: Login with Authelia OpenID (the name is coming from the Title field in the Social Login options we setup earlier).

If this is set to true then the user flow will skip the login page and automatically bring you to the Authelia Consent Page at https://auth.example.com/consent?consent_id=alphanuber-uuid-string

Conclusion

And that's it! Assuming all the settings that worked for me, work for you, you should be able to login using OpenID Connect via Authelia. If you find any errors, it's a good idea to keep a document of all your settings from Authelia/Nextcloud/LLDAP etc so that you can easily reference and ensure everything lines up.

If you have any issues, please create a discussion or join the Discord.