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From: John Bradley <ve7jtb@ve7jtb.com>
In-Reply-To: <54E4D2A5.5030705@gmx.net>
Date: Tue, 24 Feb 2015 20:55:04 -0500
Message-Id: <CB4A9839-31F2-4B15-8E76-BC3623C8B734@ve7jtb.com>
References: <CAHbuEH587HcqaqTMrmLPXQimRAaS2j1Uv+BC-0UHeyBwC8+3Uw@mail.gmail.com>
 <54DC2CB1.8090400@mit.edu> <D3644538-EF35-476B-8158-270C8FC21647@oracle.com>
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 <DC682515-BCFD-42B8-9765-BD8EF32DDBD2@mit.edu> <54E4D2A5.5030705@gmx.net>
To: Hannes Tschofenig <hannes.tschofenig@gmx.net>
Archived-At: <http://mailarchive.ietf.org/arch/msg/oauth/QQzJeCQ0_a9v3KbS5iyMdDtiqiM>
Cc: "oauth@ietf.org" <oauth@ietf.org>
Subject: Re: [OAUTH-WG] AD review of Draft-ietf-dyn-reg
Precedence: list


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Yes but it is authenticating the client to the AS as part of the =
resource owners consent.  =20

Ther eis a one to one mapping of resource owner to client in that case.=20=


The client ID is no more identifying than the refresh token that maps to =
the RO by design.

Yes the grant identifies the RO in some way.  The client_id and secret =
prevent that from being used in a different client if the bearer token =
leaks.

Remember the client_id is going to be different at different AS as each =
will have a separate registration.
If the client_id was fixed across multiple AS then it would be a =
correlation issue, but that is not the case.

Perhaps I am not understanding the concern?

John B.

> On Feb 18, 2015, at 12:57 PM, Hannes Tschofenig =
<hannes.tschofenig@gmx.net> wrote:
>=20
> Hi Justin, Hi John,
>=20
> I believe that provisioning a client with a unique id (which is what a
> client id/client secret is) allows some form of linkability. While it
> may be possible to associate the client to a specific user I could =
very
> well imagine that the correlation between activities from a user and
> those from the client (particularly when the client is running on the
> user's device) is quite possible.
>=20
> Ciao
> Hannes
>=20
> On 02/18/2015 06:37 PM, Justin Richer wrote:
>> I=92ll incorporate this feedback into another draft, to be posted by =
the
>> end of the week. Thanks everyone!
>>=20
>> =97 Justin
>>=20
>>> On Feb 18, 2015, at 10:30 AM, Kathleen Moriarty
>>> <kathleen.moriarty.ietf@gmail.com
>>> <mailto:kathleen.moriarty.ietf@gmail.com>> wrote:
>>>=20
>>>=20
>>>=20
>>> On Wed, Feb 18, 2015 at 10:07 AM, John Bradley <ve7jtb@ve7jtb.com
>>> <mailto:ve7jtb@ve7jtb.com>> wrote:
>>>=20
>>>    snip
>>>>    On Feb 18, 2015, at 6:46 AM, Kathleen Moriarty
>>>>    <kathleen.moriarty.ietf@gmail.com
>>>>    <mailto:kathleen.moriarty.ietf@gmail.com>> wrote:
>>>>=20
>>>>> The client_id *could* be short lived, but they usually aren't. I =
don't see any particular logging or tracking concerns using a dynamic =
OAuth client above using any other piece of software, ever. As such, I =
don't think it requires special calling out here.
>>>>=20
>>>>=20
>>>>    Help me understand why there should not be text that shows this
>>>>    is not an issue or please propose some text.  This is bound to
>>>>    come up in IESG reviews if not addressed up front.=20
>>>>=20
>>>>=20
>>>=20
>>>    The client_id is used to communicate to the Authorization server
>>>    to get a code or refresh token.  Those tokens uniquely identify
>>>    the user from a privacy perspective.=20
>>>    It is the access tokens that are sent to the RS and those can and
>>>    should be rotated, but the client)id is not sent to the RS in
>>>    OAuth as part of the spec.=20
>>>=20
>>>    If you did rotate the client_id then the AS would track it across
>>>    rotations, so it wouldn=92t really achieve anything.
>>>=20
>>>    One thing we don=92t do is allow the client to specify the
>>>    client_id, that could allow correlation of the client across
>>>    multiple AS and that might be a privacy issue, but we don=92t =
allow it.
>>>=20
>>>=20
>>> Thanks, John.  It may be helpful to add in this explanation unless
>>> there is some reason not to?=20
>>>=20
>>>=20
>>>    John B.
>>>=20
>>>=20
>>>=20
>>>=20
>>> --=20
>>>=20
>>> Best regards,
>>> Kathleen
>>> _______________________________________________
>>> OAuth mailing list
>>> OAuth@ietf.org <mailto:OAuth@ietf.org>
>>> https://www.ietf.org/mailman/listinfo/oauth
>>=20
>>=20
>>=20
>> _______________________________________________
>> OAuth mailing list
>> OAuth@ietf.org
>> https://www.ietf.org/mailman/listinfo/oauth
>>=20
>=20
> _______________________________________________
> OAuth mailing list
> OAuth@ietf.org
> https://www.ietf.org/mailman/listinfo/oauth


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