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[TLS] Re: [lamps] Re: [EXTERNAL] Re: Re: Re: Re: TLS Client Certificates; a survey

Nico Williams <nico@cryptonector.com> Fri, 03 April 2026 16:05 UTC

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Date: Fri, 03 Apr 2026 11:05:06 -0500
From: Nico Williams <nico@cryptonector.com>
To: Peter Gutmann <pgut001@cs.auckland.ac.nz>
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References: <MN2PR17MB40315028C6985BD9F4F0C886CD52A@MN2PR17MB4031.namprd17.prod.outlook.com> <acrfWoDSHUrYj1if@ubby> <CAKZgXHqKBwYqjB3SOexT1B3=P2m83esgQTV74PJtjk+LGwAhcA@mail.gmail.com> <CACf5n7-n6xj35ukPznkes8rDx9-QWi+CDntt2Z5jcM1L+uo1RQ@mail.gmail.com> <MEAPR01MB3654DAD44EEA7037763885D0EE50A@MEAPR01MB3654.ausprd01.prod.outlook.com> <LV0PR21MB66235C39FFCC9E350BC982DA8C50A@LV0PR21MB6623.namprd21.prod.outlook.com> <ac15yB5aylmUnjc6@ubby> <MEAPR01MB3654D313ADD0D83693FB21BCEE51A@MEAPR01MB3654.ausprd01.prod.outlook.com> <ac6iN4Z6UaUsARHt@ubby> <SYCPR01MB3661C72DB9D344C301B787F2EE5EA@SYCPR01MB3661.ausprd01.prod.outlook.com>
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Subject: [TLS] Re: [lamps] Re: [EXTERNAL] Re: Re: Re: Re: TLS Client Certificates; a survey
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On Fri, Apr 03, 2026 at 07:38:21AM +0000, Peter Gutmann wrote:
> Nico Williams <nico@cryptonector.com> writes:
> >Recall that we're talking about constraining client certificate use here to
> >just dNSName SAN certificates.  Since KB5014754 at least the mapping of those
> >to machine accounts from Active Directory should not be trivial to spoof by
> >WebPKI CAs anymore.
> 
> I'm not sure whether proposing AD (or some other equivalent, if there is one)
> as a means of managing certificate access control is going to help or if it'll
> just make things worse.  [...]

I was not proposing any such thing.  I was talking about how client
certs might get mapped to powerful accounts on Windows given that's what
had been mentioned earlier.

Nico
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