I know this is a duplicate of #180 , but since that issue has been marked closed without merging into production i'd like to reopen this feature request.
I'm so interested for this support
There was a PR to add shibboleth support that I had closed for a variety of reasons. If you have a customized version of Greenlight, you could try pull the changes and seeing if you're able to use it to configure SAML.
In general, one could think of implementing authentication in the webserver, whereas greenlight does solely authorization.
Servers such as apache2 support a plethora of authentications options, that basically result in having a REMOTE_USER header parameter.
I guess, that evaluating REMOTE_USER for authentication is a rather simple implementation from greenlight鈥檚 point of view, thus keeping the maintaince effort rather low.
Edit: Basically, that's what trac (https://trac.edgewall.org/) was doing about a decade ago.
Just a bump, so interested parties get notified. There's a patch available that implements some kind of SAML in #1334
Going to tag this as won't implement for now. For those looking for SAML auth, we recommend you pull the PR #1334 locally and use that.
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I'm so interested for this support