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Re: [TLS] OCSP stapling problem

Rob Stradling <rob@sectigo.com> Wed, 19 December 2018 11:48 UTC

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From: Rob Stradling <rob@sectigo.com>
To: "Salz, Rich" <rsalz@akamai.com>, "T.Tributh" <tls=40tributh.net@dmarc.ietf.org>, "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] OCSP stapling problem
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Date: Wed, 19 Dec 2018 11:48:38 +0000
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Subject: Re: [TLS] OCSP stapling problem
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On 19/12/2018 01:18, Salz, Rich wrote:
>>     The "exim" server claims to support stapling (for incoming connections)
>    
> Yes, which isn't what I asked.
>    
>>     The Must-Staple belongs to the certificate which was requested
>      including "1.3.6.1.5.5.7.1.24=DER:30:03:02:01:05"
>      in the CSR.
>    
> Does the exim server understand that extension?  If, for example, exim was built with OpenSSL, then it does not handle that extension.  What TLS stack was the server built with?
> 
>>     OCSP Must-Staple certificates are getting more popular.
> 
> FWIW, I have not noticed this, but maybe I'm looking in the wrong places.  On the other hand, nobody has raised the issue, nor made a pull request, with OpenSSL, so it can't be very popular yet.

Rich,

OpenSSL already has some support for Must-Staple:
https://github.com/openssl/openssl/pull/495

(Perhaps I've misunderstood what is "the issue" that "nobody has raised"?)

-- 
Rob Stradling
Senior Research & Development Scientist
Sectigo Limited

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