openid / openid/native-sso

[Native SSO] DPoP support

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Description

Originally submitted by Takahiko Kawasaki (Takahiko Kawasaki) on 2025-04-21

OpenID Connect Native SSO for Mobile Apps 1.0 - draft 07, Section 4.4. “Token Exchange Response” requires the token_type to be bearer.

token_type

REQUIRED. The value of this parameter MUST be bearer.

This requirement prevents the specification from being used in conjunction with RFC 9449: OAuth 2.0 Demonstrating Prof of Possesion (DPoP), which uses DPoP as the token_type.

It would be better to adjust the wording of this requirement to allow Native SSO and DPoP to be used together.


Bitbucket status: new

Bitbucket origin: issue 2175

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Read Section 4.4 of the OpenID Connect Native SSO for Mobile Apps draft and RFC 9449 first, focusing on the token exchange response and token_type requirements. Done means proposing and agreeing on specification wording that permits DPoP alongside Native SSO without leaving the response requirement ambiguous.

Written by the indexing model from the issue text.

Assessment

Domain
authentication, security
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
35/100

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