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The authentication landscape is changing, and a lot of work has been done in Linux authentication technologies to keep up. Learn how FreeIPA and SSSD have grown support for FIDO2 passkeys and for authenticating users from external OAuth 2.0 identity providers. There will be demos! Authentication is a critical aspect of host, network and organisational security. Identity management systems like FreeIPA centralise your identities and access policies, to help you meet your security and compliance requirements. Historically and up to the present day, passwords were widely used for initial user authentication. But in the current era a healthy security posture often demands 2FA, hardware cryptographic tokens, consumption of identity assertions from third party providers, or some combination of these. Major trends in the web authentication landscape include *Passkeys*, and delegation of authentication to third-parties (sometimes called "Web SSO"). *Passkeys* is a convenient, passwordless, phishing-resistant authentication technology based on FIDO Alliance standards. It uses public key cryptography and the credential can be implemented in software or hardware. *OAuth 2.0* is an access delegation protocol widely used on the web. You have probably seen services that offer "Log in with {popular site}". When you use these options, OAuth 2.0 (or the OpenID Connect protocol which builds upon it) are what happens behind the scenes. OAuth 2.0 also support non-web applications via the *Device authorisation grant* flow. Recent releases of FreeIPA and its client-side companion SSSD added support for both of these authentication technologies. In this presentation I will review how these mechanisms work, and describe what had to be added or changed in FreeIPA and SSSD to support them. Attendees will learn, via practical demonstrations, how to configure their own systems and networks to use these modern, secure authentication mechanisms.