Re: [OAUTH-WG] I-D Action: draft-ietf-oauth-pop-architecture-06.txt

Justin Richer <jricher@mit.edu> Wed, 25 November 2015 20:21 UTC

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From: Justin Richer <jricher@mit.edu>
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Date: Wed, 25 Nov 2015 15:21:38 -0500
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To: Phil Hunt <phil.hunt@oracle.com>
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Subject: Re: [OAUTH-WG] I-D Action: draft-ietf-oauth-pop-architecture-06.txt
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The only actual requirement is opacity. Section 6 should be more clearly called out as an example instead, which is what it is.

Perhaps we should also re-state that access tokens remain opaque to the client in the introductory text.

 — Justin

> On Nov 25, 2015, at 3:19 PM, Phil Hunt <phil.hunt@oracle.com> wrote:
> 
> Thats not what I am on about. 
> 
> Kathleen objected to the signed requirement in sec 6 without making it clear in sec 5. 
> 
> We can't have it both ways. Be both opaque and signed for the client to verify.  
> 
> If I restore the requirements than the threat mitigation assumption of signed tokens must also be removed. 
> 
> Phil
> 
> On Nov 25, 2015, at 12:02, John Bradley <ve7jtb@ve7jtb.com <mailto:ve7jtb@ve7jtb.com>> wrote:
> 
>> The token is opaque to the client.  It’s format is a matter between the RS and the AS. 
>> 
>> Where do we require the client verify the token?    The RS is the only party that needs to verify the access token.
>> 
>> The information that the client needs about the token is in additional meta-data delivered with but not in the AT.
>> 
>> I agree with Brian that is wrong on two counts.
>> 
>> 1) the token is opaque to the client.
>> 2) one method of delivering the key to the RS is in a signed JWT.  It is however also possible (if not ideal) for the AT to be a reference, and introspected by the RS to get the key.
>> 
>> So 
>> "In contrast to bearer tokens [RFC6750] which call for tokens that are opaque to OAuth 2.0 clients, this specification defines the requirements for proof-of-possession ("PoP") tokens that may are also opaque to OAuth 2.0 clients but may be parsed and verified, or introspected by OAuth 2.0 Resource Servers. When token endpoints issue “PoP” tokens they provide the OAuth Client additional parameters with information on what key material to use for the proof.”
>> 
>> Or given that they are both opaque that part of the statement could be dropped.
>> 
>> John B. 
>> 
>> 
>>> On Nov 25, 2015, at 12:44 PM, Phil Hunt <phil.hunt@oracle.com <mailto:phil.hunt@oracle.com>> wrote:
>>> 
>>> Except that later on we require the token be signed and the client verify that signed token. IOW mutual pop. 
>>> 
>>> Phil
>>> 
>>> On Nov 25, 2015, at 07:30, Brian Campbell <bcampbell@pingidentity.com <mailto:bcampbell@pingidentity.com>> wrote:
>>> 
>>>> Looking at the diff I noticed the following new text, which seems to conflate bearer/PoP and opaqueness to the client. A client demonstrating proof-of-possession of some key is orthogonal to the client being able to parse and understand the access token itself. 
>>>>  
>>>> "In contrast to bearer tokens [RFC6750] which call for tokens that are opaque to OAuth 2.0 clients, this specification defines the requirements for proof-of-possession ("PoP") tokens that may be parsed and verified by OAuth 2.0 clients and relying parties."
>>>> 
>>>> On Tue, Nov 24, 2015 at 1:07 PM, Phil Hunt <phil.hunt@oracle.com <mailto:phil.hunt@oracle.com>> wrote:
>>>> This draft addresses review comments from Kathleen and Erik raised since the last draft.
>>>> 
>>>> It may not include some of the discussion from yesterday/today.  I will add that as the group decides.
>>>> 
>>>> Cheers,
>>>> 
>>>> Phil
>>>> 
>>>> @independentid
>>>> www.independentid.com <http://www.independentid.com/>
>>>> phil.hunt@oracle.com <mailto:phil.hunt@oracle.com>
>>>> 
>>>> > On Nov 24, 2015, at 12:05 PM, internet-drafts@ietf.org <mailto:internet-drafts@ietf.org> wrote:
>>>> >
>>>> >
>>>> > A New Internet-Draft is available from the on-line Internet-Drafts directories.
>>>> > This draft is a work item of the Web Authorization Protocol Working Group of the IETF.
>>>> >
>>>> >        Title           : OAuth 2.0 Proof-of-Possession (PoP) Security Architecture
>>>> >        Authors         : Phil Hunt
>>>> >                          Justin Richer
>>>> >                          William Mills
>>>> >                          Prateek Mishra
>>>> >                          Hannes Tschofenig
>>>> >       Filename        : draft-ietf-oauth-pop-architecture-06.txt
>>>> >       Pages           : 23
>>>> >       Date            : 2015-11-24
>>>> >
>>>> > Abstract:
>>>> >   The OAuth 2.0 bearer token specification, as defined in RFC 6750,
>>>> >   allows any party in possession of a bearer token (a "bearer") to get
>>>> >   access to the associated resources (without demonstrating possession
>>>> >   of a cryptographic key).  To prevent misuse, bearer tokens must be
>>>> >   protected from disclosure in transit and at rest.
>>>> >
>>>> >   Some scenarios demand additional security protection whereby a client
>>>> >   needs to demonstrate possession of cryptographic keying material when
>>>> >   accessing a protected resource.  This document motivates the
>>>> >   development of the OAuth 2.0 proof-of-possession security mechanism.
>>>> >
>>>> >
>>>> > The IETF datatracker status page for this draft is:
>>>> > https://datatracker.ietf.org/doc/draft-ietf-oauth-pop-architecture/ <https://datatracker.ietf.org/doc/draft-ietf-oauth-pop-architecture/>
>>>> >
>>>> > There's also a htmlized version available at:
>>>> > https://tools.ietf.org/html/draft-ietf-oauth-pop-architecture-06 <https://tools.ietf.org/html/draft-ietf-oauth-pop-architecture-06>
>>>> >
>>>> > A diff from the previous version is available at:
>>>> > https://www.ietf.org/rfcdiff?url2=draft-ietf-oauth-pop-architecture-06 <https://www.ietf.org/rfcdiff?url2=draft-ietf-oauth-pop-architecture-06>
>>>> >
>>>> >
>>>> > Please note that it may take a couple of minutes from the time of submission
>>>> > until the htmlized version and diff are available at tools.ietf.org <http://tools.ietf.org/>.
>>>> >
>>>> > Internet-Drafts are also available by anonymous FTP at:
>>>> > ftp://ftp.ietf.org/internet-drafts/ <ftp://ftp.ietf.org/internet-drafts/>
>>>> >
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>>>> 
>>>> 
>>>> -- 
>>>>  <https://www.pingidentity.com/> 				
>>>> Brian Campbell
>>>> Distinguished Engineer
>>>> Ping Identity
>>>> @	bcampbell@pingidentity.com <mailto:bcampbell@pingidentity.com>
>>>> 	+1 720.317.2061
>>>> 	@pingidentity
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