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2FA checks for API workflows

Patricio Cano requested to merge 2fa-api-check into master

What does this MR do?

It adds a check to the API /session endpoint that will deny authentication requests to users that have 2FA enabled. In the error message it will instruct them to use a Personal Access Token instead.

It adds a check to the /oauth/token endpoint, when grant_type: 'password' is used, so that no OAuth2 access token can be generated if the user has 2FA enabled. This endpoint should not be used by OAuth applications, anyway. OAuth apps should follow the flow of redirecting the user to GitLab, where 2FA access restrictions apply and logging them in there. Once successfully authenticated, the OAuth token is passed to the client.

Why was this MR needed?

No 2FA check on API endpoints.

What are the relevant issue numbers?

Fixes #2979 (closed)

Edited by 🤖 GitLab Bot 🤖

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