Re: [OAUTH-WG] Comments on ietf-oauth-dpop

2022-03-24 Thread Brian Campbell
Hello Nicolas, The situation you describe of nonce switching with different RSs using the same domain is possible. But I believe in practice it's rather unlikely to occur and is self correcting even if it does occur (though kinda chatty/inefficient). I don't believe it's worthwhile to add stuff to

Re: [OAUTH-WG] Comments on ietf-oauth-dpop

2022-03-24 Thread Brian Campbell
On Wed, Mar 23, 2022 at 5:01 PM Rohan Mahy wrote: > Hi Brian, > > To be clear, for pre-generated proofs, I am not worried about an attack > against the client; I am worried about a malicious client. Imagine a > malicious client which pre-generates proofs during a brief window while it > has acces

Re: [OAUTH-WG] [EXTERNAL] Re: Device Authorization Grant and Illicit Consent Exploits

2022-03-24 Thread Pieter Kasselman
Thanks George, I agree that there are “on behalf-off” authorization use cases where strict proximity enforcement could be problematic. I think of proximity as one of the controls that can be applied and influence the risk assessment. For example, the authorization server may still issue authori

Re: [OAUTH-WG] [EXTERNAL] Re: Device Authorization Grant and Illicit Consent Exploits

2022-03-24 Thread Pieter Kasselman
Hi Brock, one of the options to consider here is just better guidance in terms of implementation, including guidance on selecting protocols. From looking at numerous exploits (not just the authroization grant flow and the social engineering exploits), implementation issues is by far the most pre

Re: [OAUTH-WG] [EXTERNAL] Re: Device Authorization Grant and Illicit Consent Exploits

2022-03-24 Thread Brock Allen
Yep +1 But also... in my experience, FWIW, the dev generally wants to do the right thing and follow the guidance, but then you get the product owner/marketing/sales/UX/designer people who then want to make things as friction-less for the end user/customer (which often translates into revenue).

[OAUTH-WG] draft-bertocci-oauth-step-up-authn-challenge - how can an RS signal re-authenticate user, without concern for ACR?

2022-03-24 Thread Vladimir Dzhuvinov
Given the suggested protocol for step up (I just watched the talk in Vienna, thanks Vittorio & Brian) - how could an RS signal that it simply wants the end-user re-authenticated, without being concerned about the ACR? Vladimir -- Vladimir Dzhuvinov smime.p7s Description: S/MIME Cryptographi

Re: [OAUTH-WG] draft-bertocci-oauth-step-up-authn-challenge - how can an RS signal re-authenticate user, without concern for ACR?

2022-03-24 Thread Filip Skokan
I believe through the use of max_age. - Filip > 24. 3. 2022 v 15:59, Vladimir Dzhuvinov : > > Given the suggested protocol for step up (I just watched the talk in Vienna, > thanks Vittorio & Brian) - how could an RS signal that it simply wants the > end-user re-authenticated, without being co

Re: [OAUTH-WG] Comments on ietf-oauth-dpop

2022-03-24 Thread Rohan Mahy
Hi Brian, 1) Re: requiring a nonce or an expiration time, I'll propose some specific text. Section 4.2 insert after "* iat: Time at which the JWT was created (REQUIRED)." "The DPoP proof MUST include either one or both of the following: * exp: time after which the proof is no longer valid. * non