Allow setting up a password after OIDC account creation. (Same for WebAuthn, which does not work; filed separately)

[Wikinaut]

Feature request

Which Nextcloud Version are you currently using: (see administration page)

• [Nextcloud Hub 9] (30.0.12)
• OpenIDC 7.3.2

Is your feature request related to a problem? Please describe.

• Allow optional setting of password even after account creation by OIDC
• Problem to be solved: OIDC-Accounts do not allow to set up a password, not even by Admins

Describe the solution you'd like
Describe alternatives you've considered

• Several use cases require (now and then) that users can also login with their e-mail and password
• I tested the following is working, but I don't like the workaround:

1. As Admin, add manually an account for a new user X and give the Account name = OIDCLOGINPREFIX-<sub>.
2. For this trick, you as Admin need to know the <sub>.
3. Set up a start password for the new user X
4. When user X sub comes with OIDC, OIDC logs into the correct account.
5. User is now able to login either by OIDC or by e-mail (alternatively OIDCLOGINPREFIX-<sub>) and their password.
6. User is able to change the password

Additional context
I wish the OIDC App to allow setting a password even when no password has been assigned before the first OIDC-account-connect. The described trick works, but is ugly to perform and requires admin work.

[Wikinaut]

See also #1189

[edward-ly]

The workaround does sound ugly, for sure, but I'm not sure if it's a good idea for NC to overwrite a user's credentials from the IdP either. If anything, I think the password should be updated on the IdP side, but perhaps @julien-nc has other ideas.

[Wikinaut]

Just allow, as admin-settable option **), the setup of an optional password. It works perfectly in parallel to OIDC login, then.

In MediaWiki *), we do the same. If enabled, it allows users to login to their accounts, once these are created by initial OIDC login, without OIDC, i.e. on other devices.

*) https://www.mediawiki.org/wiki/Extension:OpenID_Connect

**) option, because this opening of a loophole may not be suited for all NC installations, environments, companies. Personally, I like this way very much and implemented this for wikis with > 1000 users.

[meaglerick]

I would also apprpeciate this option. I have a use case where OIDC is available in one network, but not the other. Having the option to set and then use that password would be most beneficial.