Re: [TLS] Duplicate oid_filters

Ilari Liusvaara <ilariliusvaara@welho.com> Sat, 10 March 2018 15:03 UTC

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Date: Sat, 10 Mar 2018 17:02:50 +0200
From: Ilari Liusvaara <ilariliusvaara@welho.com>
To: Sean Turner <sean@sn3rd.com>
Cc: Benjamin Kaduk <bkaduk@akamai.com>, "<tls@ietf.org>" <tls@ietf.org>
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Subject: Re: [TLS] Duplicate oid_filters
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On Fri, Mar 09, 2018 at 07:35:09PM -0500, Sean Turner wrote:
> 
> > On 03/09/2018 03:35 PM, Eric Rescorla wrote:
> >> 
> >> The current text neither allows nor prohibits the same OID
> >> appearing twice. We should do one or the other.
>
> Okay so the OIDs can’t appear twice in the certificate, because
> certificate extensions are only supposed to appear once so why
> don’t we just follow suit and require no dupes?

Duplicate OIDs do not look to be useful either:

- All of currently defined filters have "all of" behavior.
- Duplicate filters would presumably intersect.
- Thus, one can rewrite a filter that has duplicate OIDs with just
  each OID once.



-Ilari