Re: [Unbearable] FWD: Status of draft-ietf-tokbind-https

=JeffH <Jeff.Hodges@KingsMountain.com> Thu, 16 November 2017 02:52 UTC

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To: IETF TokBind WG <unbearable@ietf.org>
From: =JeffH <Jeff.Hodges@KingsMountain.com>
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Date: Thu, 16 Nov 2017 10:51:21 +0800
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Archived-At: <https://mailarchive.ietf.org/arch/msg/unbearable/XMuAumDhLOn2w2_0JF_IBPYuPyc>
Subject: Re: [Unbearable] FWD: Status of draft-ietf-tokbind-https
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From: Andrei Popov <Andrei.Popov@microsoft.com>
Date: Monday, November 13, 2017 at 10:50 PM
To: Eric Rescorla <ekr@rtfm.com>om>, Leif Johansson <leifj@sunet.se>se>, Vinod 
Anupam <vanupam@google.com>
Cc: "draft-ietf-tokbind-https@tools.ietf.org" 
<draft-ietf-tokbind-https@tools.ietf.org>rg>, "tokbind-chairs@ietf.org" 
<tokbind-chairs@ietf.org>
Subject: RE: Status of draft-ietf-tokbind-https
Resent-From: <alias-bounces@ietf.org>rg>, Andrei Popov 
<Andrei.Popov@microsoft.com>
Resent-To: <andreipo@microsoft.com>om>, <mnystrom@microsoft.com>om>, Dirk 
Balfanz <balfanz@google.com>om>, Adam Langley <agl@google.com>om>, 
<nharper@google.com>om>, Jeff Hodges <Jeff.Hodges@PayPal.com>om>, 
<draft-ietf-tokbind-https@ietf.org>
Resent-Date: Tuesday, November 14, 2017 at 12:23 AM

I’m available in the morning; unfortunately, Dirk is not here, but 
Anupam can represent him.

Regarding the attack, it is not quite clear to me:
Even assuming the TP is willing to issue a token for Alice to connect to 
the Attacker (which probably means the Attacker is a server known to the 
TP), this token will be bound to the TB key Alice has created for use 
with the attacker.
So the attacker cannot use this token to impersonate Alice to another 
server (without also stealing the corresponding private key).
Or am I missing something?

What time should we meet tomorrow?

Cheers,

Andrei