9.12 RP Authentication to an IdP

A federation transaction typically takes place over multiple network calls. Throughout this process, it is important for the IdP and RP to know that they are talking to the same party that they were in the previous step and, ultimately, to the party that they expect to be in the transaction with in the first place.

Different techniques provide different degrees of assurance, depending on the federation protocol in use and the needs of the system. For example, the Authorization Code Flow of [OIDC] allows the RP to register a shared secret or private key with the IdP prior to the transaction, allowing the IdP to strongly authenticate the RP’s request in the back channel to retrieve the assertion. In addition, the Proof Key for Code Exchange protocol in [RFC7636] allows the RP to dynamically create an unguessable secret that is transmitted in hashed form in the front channel and then transmitted in full in the back channel along with the assertion reference. These techniques can be combined for even greater assurance.

Federation authorities can also facilitate the authentication process. If the RP registers its public key and identifier with the federation authority, the IdP only needs to retrieve the appropriate verification keys from the federation authority instead of requiring the RP to register itself ahead of time.

Technical profiles of specific federation protocols are out of the scope of these guidelines, but high-security profiles such as [FAPI] provide extensive guidelines for implementers to deploy secure federation protocols.

1. Panoramica

1.1 Riferimenti

1.2 Requisiti identificati

1.3 Regolamentazioni correlate

2. Requisiti identificati

3. Regolamentazioni correlate

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