> So it may be necessary to have the server respond with its own flag to 
> indicate that it really does want client cert auth and isn't just asking for 
> a client cert on autopilot.
An "I really mean it" flag. We can add these for every TLS message, not just 
authentication-related ones. Just to make sure the peer truly is serious about 
the TLS handshake.
😊

-----Original Message-----
From: TLS <tls-boun...@ietf.org> On Behalf Of Peter Gutmann
Sent: Tuesday, October 24, 2023 12:55 AM
To: tls@ietf.org
Subject: Re: [TLS] [EXTERNAL] Re: Request mTLS Flag

Viktor Dukhovni <ietf-d...@dukhovni.org> writes:

>I don't see in your comment anything to suggest that the flag is a no-go.

Oh, it's definitely not a no-go, just pointing out that you shouldn't read too 
much into seeing a cert request from a server.  In other words if the client 
says "I have a cert" and the server responds "please authenticate using the 
cert", that doesn't mean that the server will actually expect client cert auth 
at that point.

So it may be necessary to have the server respond with its own flag to indicate 
that it really does want client cert auth and isn't just asking for a client 
cert on autopilot.

Peter.

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