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Re: [Emu] Issue 47 Certificate identity checks

Tim Cappalli <Tim.Cappalli@microsoft.com> Mon, 12 April 2021 18:16 UTC

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From: Tim Cappalli <Tim.Cappalli@microsoft.com>
To: "lear=40cisco.com@dmarc.ietf.org" <lear=40cisco.com@dmarc.ietf.org>, "aland@deployingradius.com" <aland@deployingradius.com>
CC: "emu@ietf.org" <emu@ietf.org>
Thread-Topic: [Emu] Issue 47 Certificate identity checks
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Date: Mon, 12 Apr 2021 18:15:50 +0000
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Subject: Re: [Emu] Issue 47 Certificate identity checks
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Pinning the server certificate is unrealistic. A properly configured supplicant with a trusted private root and subject match is adequate and allows good security hygiene with server cert rotation.

I believe the id-kp-eapOverLAN EKU should be a MUST. Public CAs should not be issuing server certificates for EAP in the first place. I feel like this debate comes up every few years. Any public CA-signed TLS web server certificate that is used for EAP can be requested to be revoked for misuse.

If an organization cannot ensure proper configuration of a supplicant, they should not be using EAP.

tim
________________________________
From: Emu <emu-bounces@ietf.org> on behalf of Eliot Lear <lear=40cisco.com@dmarc.ietf.org>
Sent: Monday, April 12, 2021 14:07
To: Alan DeKok <aland@deployingradius.com>
Cc: EMU WG <emu@ietf.org>
Subject: Re: [Emu] Issue 47 Certificate identity checks



> On 12 Apr 2021, at 19:54, Alan DeKok <aland@deployingradius.com> wrote:
>
> On Apr 12, 2021, at 12:22 PM, Joseph Salowey <joe@salowey.net> wrote:
>> [Joe]  without some sort of name matching using certs from a public CA is unwise.
>
>  The only other alternative is to "pin" the server cert.  Many systems support this.  Perhaps mentioning [Trust On] First Use (TOFU) would help here.
>

That won’t work for headless wireless.

Yes, we have kicked that hornet’s nest.  I hope everyone is wearing appropriate netting.

Eliot

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