We haven't tried it ourselves but Feathers just uses passport for auth underneath so any passport auth strategy will work. For SAML, to make it feel "Feathersy" might take a bit more work (ie. wrapping it up as a Service) but definitely open to creating an issue for it and for PRs. A quick and dirty way is to just use it Express style and call the official Feathers auth services from your own Express routes. Feathers really is just Express, so you can use any Express middleware like https://github.com/bergie/passport-saml.