eap Mailing List: Re: Re: Issue 352: Channel Binding Issue

[Yoshihiro Ohba (yohba]

On Sun, May 07, 2006 at 11:43:08AM -0700, Salowey, Joe wrote:
>  
> 
> > > [Joe] I don't see how this text is obsolete.  Channel binding is not
> > > just an EAP-keying concept. 
> > 
> > I'd say the Channel Binding problem description in RFC3748 is valid,
> > but the solution described in RFC 3748 would be a bit obsolete.
> > 
> [Joe] Obsoleted by what?

I'd say by CB with key mixing.

> 
> > > 
> > > > 
> > > > "
> > > > Using such a protected exchange, it is possible to match 
> > the channel
> > > > properties provided by the authenticator via out-of-band 
> > mechanisms
> > > > against those exchanged within the EAP method.  For 
> > example, see the
> > > > discussion in Section 1.4 as well as 
> > [I-D.arkko-eap-service-identity-
> > > > auth].
> > > > "
> > > > 
> > > > According to the the AAA server's requirement on pre-configurating
> > > > Channel Binding parameters, I don't see the usefulness of
> > > > [I-D.arkko-eap-service-identity-auth].  Do we really need this
> > > > paragraph?
> > > > 
> > > [Joe] It still seems useful to me. 
> > 
> > Can you elaborate on how it is useful?
> > 
> [Joe] It allows the back end to validate parameters advertised by the
> authenticator. 

I have a doubt about the usefulness of doing this for Channel Binding
as it requires the additional over-the-air step of exchanging CB data
between the peer and the server.  In key mixing approach, this step is
not needed.

Yoshihiro Ohba


> 
> > Regards,
> > Yoshihiro Ohba
> > 
> > 
> > > 
> > > 
> > > > 
> > > > "
> > > > The main difference between these approaches is that 
> > Channel Binding
> > > > support within an EAP method may require upgrading or changing the
> > > > EAP method, impacting both the peer and the server.   
> > Where Channel
> > > > Bindings are implemented in AAA,  the peer, authenticator and the
> > > > backend server need to be upgraded, but the EAP method need not be
> > > > modified.
> > > > "
> > > > 
> > > > If we have only one Channel Binding method, we don't need this
> > > > comparison.
> > > 
> > > [Joe] I don't think this is the place to define one method.
> > > 
> > > 
> > > > Best regards,
> > > > Yoshihiro Ohba
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> > > 
> > > 
> > 
> 
>