Re: [Trans] Relaxing section 5.1

Ben Laurie <benl@google.com> Thu, 03 November 2016 10:31 UTC

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From: Ben Laurie <benl@google.com>
Date: Thu, 03 Nov 2016 10:31:50 +0000
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To: Peter Bowen <pzbowen@gmail.com>
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Cc: Melinda Shore <melinda.shore@gmail.com>, "trans@ietf.org" <trans@ietf.org>
Subject: Re: [Trans] Relaxing section 5.1
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On 2 November 2016 at 14:08, Peter Bowen <pzbowen@gmail.com> wrote:
>
> By requiring all logs MUST accept any certificate that chains to a
> root in the log's root list, 6962bis fails to allow log operators to
> mitigate any Denial of Service attacks mounted by attempting to log
> massive numbers of certificates that are not relevant to the log
> scope.  For example, many existing certification authorities issue
> both server authentication certificates and certificates for personal
> identification.  For some roots, acquiring large numbers of these is
> relatively easy (see discussion of fetching millions of Taiwanese
> Citizen Digital Certificates in
> https://smartfacts.cr.yp.to/smartfacts-20130916.pdf)  As written
> today, a log MUST accept these.  There is no option for a log to
> require that all certificates must meet some usability criteria.

The requirement is to reject certs that don't meet the criteria, not
to accept those that do.