Claire bddd9ba36d Add OMNIAUTH_ONLY environment variable to enforce externa log-in (#17288) ... * Remove support for OAUTH_REDIRECT_AT_SIGN_IN Fixes #15959 Introduced in #6540, OAUTH_REDIRECT_AT_SIGN_IN allowed skipping the log-in form to instead redirect to the external OmniAuth login provider. However, it did not prevent the log-in form on /about introduced by #10232 from appearing, and completely broke with the introduction of #15228. As I restoring that previous log-in flow without introducing a security vulnerability may require extensive care and knowledge of how OmniAuth works, this commit removes support for OAUTH_REDIRECT_AT_SIGN_IN instead for the time being. * Add OMNIAUTH_ONLY environment variable to enforce external log-in only * Disable user registration when OMNIAUTH_ONLY is set to true * Replace log-in links When OMNIAUTH_ONLY is set with exactly one OmniAuth provider		2022-01-23 15:52:58 +01:00
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