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Re: [TLS] Eric Rescorla's Discuss on draft-ietf-tls-dnssec-chain-extension-06: (with DISCUSS and COMMENT)

Shumon Huque <shuque@gmail.com> Wed, 21 February 2018 15:57 UTC

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From: Shumon Huque <shuque@gmail.com>
Date: Wed, 21 Feb 2018 10:57:31 -0500
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To: Viktor Dukhovni <ietf-dane@dukhovni.org>
Cc: Eric Rescorla <ekr@rtfm.com>, TLS WG <tls@ietf.org>, draft-ietf-tls-dnssec-chain-extension@ietf.org, The IESG <iesg@ietf.org>, tls-chairs <tls-chairs@ietf.org>
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Subject: Re: [TLS] Eric Rescorla's Discuss on draft-ietf-tls-dnssec-chain-extension-06: (with DISCUSS and COMMENT)
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On Thu, Feb 8, 2018 at 11:35 AM, Viktor Dukhovni <ietf-dane@dukhovni.org>
wrote:
>
>
> Summary as I see it:
>
>   * Mandatory DANE:
>   MUST Refuse absence of TLSA RRs or failure
>     of PKIX-TA(0) and PKIX-EE(1).  Must fail when no TLSA RRs
>     are cache and the server does not present the extension.
>
>   * "Opportunistic DANE": MAY refuse failed PKIX-TA(0) and PKIX(1)
>     if caching replies, and SHOULD attempt to refresh cache before
>     expiration to reduce opportunity for downgrades.  Non-caching
>     clients don't really gain security by refusing valid PKIX on
>     DANE failure, and MAY choose to continue.
>

This seems reasonable to me too.

Shumon

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