oauth2 login disabled if registration is disabled

[yannick]

• Gitea version (or commit ref):

• Git version: 1.1.0+655-ga257f88a built with: bindata, sqlite

• Operating system: macOS

• Database (use [x]):

  • [ x] SQLite

• Can you reproduce the bug at https://try.gitea.io:

  • Yes (provide example URL)
  • No
  • Not relevant

Description

when i disable registration in config i am not able to login via oauth providers unless the user registerd before.

it should be possible to disable manual registration and only allow oauth2 providers to login/register
also it should be possible to limit e.g. google oauth logins to specific domains only

[gjsman]

Yes, I really want this. I would love if I could use an OAuth Provider (Auth0.com in this case), and turn off the regular login form, allowing only people who sign in successfully through OAuth to register. 👍

[gjsman]

In the settings, there are settings for:

• Disabling Registration
• Enabling OpenID Login
• Enabling OpenID Registration

Obviously, the OAuth thing (when added as an "Authentication" doesn't use the OpenID values). In my opinion, we should have an additional setting, in the Authentication settings, which overrides the "Disable Registration" option specifically for that authentication.