Re: [TLS] Comments on draft-wood-tls-external-psk-importer-01

John Mattsson <john.mattsson@ericsson.com> Mon, 01 April 2019 21:30 UTC

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From: John Mattsson <john.mattsson@ericsson.com>
To: Russ Housley <housley@vigilsec.com>
CC: IETF TLS <TLS@ietf.org>
Thread-Topic: [TLS] Comments on draft-wood-tls-external-psk-importer-01
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Date: Mon, 1 Apr 2019 21:29:53 +0000
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Subject: Re: [TLS] Comments on draft-wood-tls-external-psk-importer-01
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Hi Russ,

I was not talking about certificates at all. My comment was about using both external_identity and one of its derived ImportedIdentity in OfferedPsks

draft-wood-tls-external-psk-importer-01:

     struct {
          opaque external_identity<1...2^16-1>;
          opaque label<0..2^8-1>;
          HashAlgorithm hash;
      } ImportedIdentity;


RFC 8446:

      struct {
          PskIdentity identities<7..2^16-1>;
          PskBinderEntry binders<33..2^16-1>;
      } OfferedPsks;

      struct {
          opaque identity<1..2^16-1>;
          uint32 obfuscated_ticket_age;
      } PskIdentity;

John

From: Russ Housley <housley@vigilsec.com>
Date: Monday, 1 April 2019 at 22:47
To: John Mattsson <john.mattsson@ericsson.com>
Cc: "TLS@ietf.org" <TLS@ietf.org>
Subject: Re: [TLS] Comments on draft-wood-tls-external-psk-importer-01

John:

The draft should make clear if the External PSK and external identity can be used together with the imported identities.

I think that draft-ietf-tls-tls13-cert-with-extern-psk would be needed with TLS 1,3 for the certificate-based authentication to be used with an external PSK.

Russ