Re: [IPsec] Fw: New Version Notification for draft-smyslov-ipsecme-ikev2-null-auth-01.txt

Paul Wouters <paul@cypherpunks.ca> Tue, 04 March 2014 10:06 UTC

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Date: Tue, 4 Mar 2014 05:06:17 -0500 (EST)
From: Paul Wouters <paul@cypherpunks.ca>
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To: Yaron Sheffer <yaronf.ietf@gmail.com>
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Cc: "ipsec@ietf.org WG" <ipsec@ietf.org>, Valery Smyslov <svanru@gmail.com>, Tero Kivinen <kivinen@iki.fi>
Subject: Re: [IPsec] Fw: New Version Notification for draft-smyslov-ipsecme-ikev2-null-auth-01.txt
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On Tue, 4 Mar 2014, Yaron Sheffer wrote:

> Quoting from the abstract: "This method may be used to preserve anonymity or 
> in situations, where no trust relationship exists between the parties." You 
> seem to assume that all clients want to be anonymous. IMHO "unauthenticated" 
> does not necessarily imply "anonymous". When I talk to someone on the plane 
> and they tell me their name, they are not authenticated and they may well be 
> lying. But in general, they are not anonymous either.

I'm really afraid of accidental leakage by implementors or administrators.
In this era, I think we should really make an effort to protect against that.

I really think it is a fundemantal problem if we allow an IPsec entity
to lie about its identity. Right now, an identity is always proven by an
authentication, and I think if there is no authentication, there should
be no identity.

If you want debugging, you can send some kind of implementation specific
custom payload - don't piggyback on auth-none.

Paul