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Re: [OAUTH-WG] DPoP - Downgrades, Transitional Rollout & Mixed Token Type Deployments

Torsten Lodderstedt <torsten@lodderstedt.net> Thu, 11 June 2020 17:51 UTC

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From: Torsten Lodderstedt <torsten@lodderstedt.net>
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Date: Thu, 11 Jun 2020 19:51:16 +0200
In-Reply-To: <CAOW4vyNS1g51vrUPHYyAmma9XjjcwXUyUJPLJ6Artm8MFuxxWw@mail.gmail.com>
Cc: Neil Madden <neil.madden@forgerock.com>, oauth <oauth@ietf.org>
To: Francis Pouatcha <fpo=40adorsys.de@dmarc.ietf.org>
References: <8762DAF0-CA56-407D-9DD9-86809BD844B2@lodderstedt.net> <6473D5F3-7C90-400D-9263-FA5B6082496B@forgerock.com> <CAOW4vyNS1g51vrUPHYyAmma9XjjcwXUyUJPLJ6Artm8MFuxxWw@mail.gmail.com>
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Subject: Re: [OAUTH-WG] DPoP - Downgrades, Transitional Rollout & Mixed Token Type Deployments
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> On 11. Jun 2020, at 19:24, Francis Pouatcha <fpo=40adorsys.de@dmarc.ietf.org> wrote:
> 
> 
> 
> On Thu, Jun 11, 2020 at 3:26 AM Neil Madden <neil.madden@forgerock.com> wrote:
> +1
> 
> > On 11 Jun 2020, at 07:36, Torsten Lodderstedt <torsten=40lodderstedt.net@dmarc.ietf.org> wrote:
> > 
> > I generally agree with the proposal, but I would suggest to limit it to public clients. 
>  
> > 
> > In case of confidential clients, the refresh token is (via the client_id) already bound to the client’s secret(s) and those can be rotated. Additionally binding the refresh token to a DPoP key would limit it’s applicability w/o a benefit. 
> I meant PoP and not DPoP. The client secret is also a variant of PoP. This does not change the value of this sentence: "refresh_token shall always be bound to a PoP".

This means you agree DPoP shall be used for refresh tokens issued to public clients only? As you said, client authentication is a kind of PoP as well, so confidential clients don’t need DPoP protection for refresh tokens. 

> 
> -- 
> Francis Pouatcha
> Co-Founder and Technical Lead at adorys
> https://adorsys-platform.de/solutions/

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