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[OAUTH-WG] audience parameter in client_credentials

Evert Pot <me@evertpot.com> Mon, 17 April 2023 21:57 UTC

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Date: Mon, 17 Apr 2023 17:57:29 -0400
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To: "oauth@ietf.org" <oauth@ietf.org>
From: Evert Pot <me@evertpot.com>
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Subject: [OAUTH-WG] audience parameter in client_credentials
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Hi list,

I'm the author a OAuth2 client library[1]. I received a feature request 
to support the "audience" parameter on client_credentials, as seen on 
the following two server implementations:

  * Auth0:
    https://auth0.com/docs/api/authentication?http#authorization-code-flow-with-pkce45
  * Kinde:
    https://kinde.com/docs/build/get-access-token-for-connecting-securely-to-kindes-api/

Is this parameter based on any standard or draft or are these 
non-standard vendor extensions? I'm hesitant blindly adding support for 
these without understanding the security implications.

Evert

[1]: https://github.com/badgateway/oauth2-client

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