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Update section on client authentication #216

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Update section on client authentication #216

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19eb79a
Update section on client authentication
eric-murray Oct 15, 2024
6085f67
Update CAMARA-Security-Interoperability.md
eric-murray Oct 18, 2024
8e13944
Merge branch 'camaraproject:main' into eric-murray-patch-1
eric-murray Oct 23, 2024
bbc9e63
Update CAMARA-Security-Interoperability.md
eric-murray Nov 6, 2024
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5 changes: 3 additions & 2 deletions documentation/CAMARA-Security-Interoperability.md
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Expand Up @@ -255,8 +255,9 @@ This document does not mandate a particular PPID algorithm to be used.

## Client Authentication

This CAMARA document allows **one** client authentication method, `private_key_jwt`, as defined in OIDC
[OIDC Client Authentication](https://openid.net/specs/openid-connect-core-1_0.html#ClientAuthentication)
The API consumer MUST authenticate with the authorisation server using `private_key_jwt`, as specified in [OIDC Client Authentication](https://openid.net/specs/openid-connect-core-1_0.html#ClientAuthentication). In addition to the mandated claims, the signed JWT MUST also include the `iat` (issued at) claim.

The difference between the `exp` (expires at) and `iat` (issued at) claims MUST be no more than 300 seconds. JWTs with a longer lifetime SHALL be rejected by the authorisation server using the `invalid_client` error code as specified in [IETF RFC 6749](https://datatracker.ietf.org/doc/html/rfc6749#section-5.2) for the `/token` endpoint, and as specified in [OIDC CIBA Core](https://openid.net/specs/openid-client-initiated-backchannel-authentication-core-1_0.html#rfc.section.13) for the `/bc-authorize` endpoint.
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This document RECOMMENDS that for [OIDC Authorization Code Flow](https://openid.net/specs/openid-connect-core-1_0.html#CodeFlowAuth) and [OAuth2 Client Credentials Grant](https://datatracker.ietf.org/doc/html/rfc6749#section-4.4) the audience SHOULD be the URL of the Authorization Server's [Token Endpoint](https://openid.net/specs/openid-connect-core-1_0.html#TokenEndpoint).
This document RECOMMENDS that for OIDC CIBA the audience SHOULD be the [Backchannel Authentication Endpoint](https://openid.net/specs/openid-client-initiated-backchannel-authentication-core-1_0.html#auth_backchannel_endpoint).
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