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I am using Sitecore 10.0.1 on the Azure App Services platform. I would like to implement federated authentication using saml. I was only able to find documentation using open id connect. Does Sitecore 10.0.1 support saml?

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Yes, you can have a SAML Federated Authentication implementation with Sitecore 10.0.1. Federated Auth is a bring-your-own-auth framework, and while most examples show OpenID Connect, you can implement whatever OWIN-based authentication that you want.

For a SAML implementation, I would recommend trying Sustainsys.Saml2. There's a good blog post from George Chang which uses exactly that library to implement SAML with Sitecore Federated Authentication.

There's a couple things to take note when doing your own implementation. In order for claims to be transformed, you need to explicitly call it as George does in the AcsCommandResultCreated callback. You can configure SAML using the XML metadata you get from your identity provider by setting the MetadataLocation property as seen in his example. Also, if you need certs for SAML on your application, you can set the cert info in SPOptions.ServiceCertificates with X509Certificate2.

Finally, I don't see it in George's blog post, but I believe you need the following transform in your identity provider config:

<transformation name="Idp Claim" type="Sitecore.Owin.Authentication.Services.SetIdpClaimTransform, Sitecore.Owin.Authentication" />

Hope that helps!

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