Redmine

I've added this to 7.0.0 for now to discuss it, but I strongly believe we should implement this in some way.

https://github.com/jcatrysse/bless-this-redmine-sso/tree/feature_version_2.0.0

This is what I have been using (I added a version 2.0.0 feature branch).

Yes please. The lack of support for modern auth / Single Sign On (SSO) is really a problem for Redmine to move forward.

The OAuth side of the force is a bit disorderly, with several plugins more or less trying to do the same thing, most of the time confusing OAuth and its subset OpenID Connect. Kontron/redmine_oauth is the only one I was able to use properly.

The SAML side of the force was, until recently, somewhat clearer : a bunch of abandoned plugins, and the last one standing being the one from AlphaNodes : https://github.com/AlphaNodes/redmine_saml. But this last one went in public archive mode on Github this fall, so I think this is not an option anymore.