Re: [TLS] Don't Split HelloRetryRequest
Christopher Patton <cpatton@cloudflare.com> Thu, 01 April 2021 17:30 UTC
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From: Christopher Patton <cpatton@cloudflare.com>
Date: Thu, 01 Apr 2021 10:29:55 -0700
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To: Martin Thomson <mt@lowentropy.net>
Cc: "<tls@ietf.org>" <tls@ietf.org>
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Subject: Re: [TLS] Don't Split HelloRetryRequest
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Hi Martin, would you mind working out a PR? I think being able to compare 407 to a concrete alternative would be helpful. Just so that we're on the same page, here's a quick summary of the issues that 407 is designed to solve. (These may or may not be problems in your view, and I don't claim this list is exhaustive.) - 233: No acceptance signal until after HRR, so the procedure for computing CH2 is underspecified. This can be avoided by advertising the same preferences in CHI/CHO, but the spec doesn't require this. - 373: To fix 3233, can we put an acceptance signal in HRR.random? Probably not, since HRR.random has a value specified in RFC8446. - 358: RFC8446 allows the value of an extension in CH2 to differ from CH1 only if the extension appears in HRR. - 333: "Split mode" is broken, since the client doesn't know who the cookie is for. Best, Chris P.
- [TLS] Don't Split HelloRetryRequest Martin Thomson
- Re: [TLS] Don't Split HelloRetryRequest Stephen Farrell
- Re: [TLS] Don't Split HelloRetryRequest Christopher Patton
- Re: [TLS] Don't Split HelloRetryRequest Stephen Farrell
- Re: [TLS] Don't Split HelloRetryRequest Christopher Patton
- Re: [TLS] Don't Split HelloRetryRequest Christopher Patton
- Re: [TLS] Don't Split HelloRetryRequest Stephen Farrell
- Re: [TLS] Don't Split HelloRetryRequest Carrick Bartle
- Re: [TLS] Don't Split HelloRetryRequest Stephen Farrell
- Re: [TLS] Don't Split HelloRetryRequest David Benjamin
- Re: [TLS] Don't Split HelloRetryRequest Stephen Farrell
- Re: [TLS] Don't Split HelloRetryRequest Martin Thomson
- Re: [TLS] Don't Split HelloRetryRequest Martin Thomson
- Re: [TLS] Don't Split HelloRetryRequest Christopher Patton
- Re: [TLS] Don't Split HelloRetryRequest Martin Thomson