Re: [Reap] [saag] PSA: New list for discussing EAP related methods

Bernard Aboba <bernard.aboba@gmail.com> Fri, 27 October 2017 01:03 UTC

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From: Bernard Aboba <bernard.aboba@gmail.com>
Date: Thu, 26 Oct 2017 18:02:47 -0700
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To: Mohit Sethi <mohit.m.sethi@ericsson.com>
Cc: reap@ietf.org, "saag@ietf.org" <saag@ietf.org>
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Subject: Re: [Reap] [saag] PSA: New list for discussing EAP related methods
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I have nothing against TLS 1.3, but it was not necessary to obsolete RFC
5216 to support TLS 1.2 and there are a number of implementations of TLS
1.3 already in progress with no issues as far as I am aware. So I don't
understand why a new document is needed - and the downside is very
substantial.

Given the prevalence of EAP-TLS in open source, there is great concern over
the introduction of encumbrance into a protocol that is widely required in
high security environments.  Were this to happen, it would in effect impose
a "tax" on each of the 2+ billion devices implementing EAP-TLS.

A cursory search of the IETF IPR database indicates that your draft could
potentially encumber EAP-TLS with a vast number of TLS-related IPR
declarations that would not necessarily apply to an RFC 5216
implementation. While there are  many installations that wish to take on
the costs (and benefits) of TLS 1.3 as well as support for additional
ciphersuites, there are also installations that would not be willing to pay
for the costs of a "forklift" upgrade for every device and server,
particularly if they were forced to migrate off of open-source due to IPR
encumbrance.  Such a migration should be up to the organization deploying
EAP-TLS, not imposed by the IETF without extra-ordinary justification (such
as an unpatcheable vulnerability found in previous versions of TLS).

In addition, the introduction of support for new authentication modes such
as PSK was explicitly rejected by for RFC 5216 in EMU because it
complicated the security analysis and would invalidate existing EAP-TLS
security proofs that were considered critical to deployment in the highest
security installations.  When an organization deploys EAP-TLS today they
know what they are getting - a protocol focused on certificate
authentication that does not attempt to be a "swiss army knife".  Such a
protocol isn't for everyone (indeed, only a small fraction of all EAP
deployments use EAP-TLS), but those that mandate its use have very specific
needs.

On Thu, Oct 26, 2017 at 10:16 AM, Mohit Sethi <mohit.m.sethi@ericsson.com>;
wrote:

> Hi Bernard,
>
> The EAP-TLS 1.3 document is a very rough drafty version that was submitted
> before the cut-off for the last IETF. As you rightly point out, it has the
> skeleton and a lot of material from RFC5216, and still many important
> details are missing.
>
> The purpose of this list is to exactly receive these kind of comments.
> Should RFC5216 be updated or obsoleted by this draft. And it would be great
> if we can have your contributions to the document. We will definitely add
> an acknowledgement section and contact the authors of RFC5216 to see if
> they can contribute and comment. We plan to have more EAP related
> contributions in the near future. We discussed this with the Security ADs
> and thought that a separate list would be appropriate to get
> feedback/criticism and contributions from the folks interested.
>
> --Mohit
>
> On 10/26/2017 06:51 PM, Bernard Aboba wrote:
>
> There are existing functioning IETF mailing lists relating to EAP.
>
> Why are you starting yet another one?
>
> From what I can tell, the EAP-TLS 1.3 draft is merely a copy of RFC 5216
> (with no acknowledgement to the original authors) stating that EAP-TLS
> implementations must support TLS 1.3.
>
> This is ridiculous because there are 1+ Billion existing implementations
> out there that
>
>
> On Thu, Oct 26, 2017 at 6:02 AM, Mohit Sethi <mohit.m.sethi@ericsson.com>;
> wrote:
>
>> Dear all,
>>
>> We have started a mailing list for discussing new EAP related work that
>> currently has no obvious home. The mailing list is called REAP (Renew EAP)
>> reap@ietf.org and you can subscribe here:
>> https://www.ietf.org/mailman/listinfo/reap
>>
>> Recently several new EAP methods have been proposed. These include for
>> example:
>>
>> EAP-TLS 1.3: https://tools.ietf.org/html/draft-mattsson-eap-tls13-00
>>
>> EAP-NOOB: https://tools.ietf.org/html/draft-aura-eap-noob-02
>>
>> EAP-SASL: https://tools.ietf.org/html/draft-vanrein-eap-sasl-00
>>
>> The list serves as a venue for discussion of these and other EAP related
>> drafts that will be submitted in the near future. As courtesy, we will post
>> any new draft to SAAG, but we plan to continue the discussion only on the
>> REAP mailing list. We have also asked for a short presentation slot during
>> SECDISPATCH at IETF 100 in Singapore.
>>
>> Comments, early feedback, and discussion on existing or new work is more
>> than welcome.
>>
>> --Mohit
>>
>> _______________________________________________
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>> saag@ietf.org
>> https://www.ietf.org/mailman/listinfo/saag
>>
>
>
>
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