Re: [TLS] Proposed Change to Certificate message (#654)
Nick Sullivan <nicholas.sullivan@gmail.com> Fri, 23 September 2016 23:05 UTC
Return-Path: <nicholas.sullivan@gmail.com>
X-Original-To: tls@ietfa.amsl.com
Delivered-To: tls@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F084A12B65D for <tls@ietfa.amsl.com>; Fri, 23 Sep 2016 16:05:25 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.699
X-Spam-Level:
X-Spam-Status: No, score=-2.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vMfdGwHXhuz4 for <tls@ietfa.amsl.com>; Fri, 23 Sep 2016 16:05:23 -0700 (PDT)
Received: from mail-it0-x231.google.com (mail-it0-x231.google.com [IPv6:2607:f8b0:4001:c0b::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 81F2312B5B0 for <TLS@ietf.org>; Fri, 23 Sep 2016 16:05:23 -0700 (PDT)
Received: by mail-it0-x231.google.com with SMTP id r192so28324935ita.0 for <TLS@ietf.org>; Fri, 23 Sep 2016 16:05:23 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=OQm/Qm5nDhyKnfnti2/kZ4tYuW3vAekF1TcBq77o7mI=; b=0B53sA93gEV3dEOn61i+18SIdfbI7OWTQ9CbAMFHDhFJnZIg0UM/X4COfJZj7Wa8Jv 7Lk/WS3XBykp4b1agVsJ1vj3HN6L2BmEXPX7KlHSbZt/mco+DKKdq/4yffYRaQupmCMM 5RcWA3kOGHFJUgMmRURLPrjdypHXWTHAjJp71j1iNRG/2rY9AsuLZFKCDto8TxKUKnNP YcNVcvgHtdxZ8TPNR1dj7S3GK+0snuJvbAoSGDz62cXIffI2dqZ039kv+abvQKOZJ3zz 49bYgkwh/VpjBglpp0Qv+HeCvA6D4rRYaaBManSyxPkgnDNR9IgVCOIIKbAHB8+C9M5q soag==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=OQm/Qm5nDhyKnfnti2/kZ4tYuW3vAekF1TcBq77o7mI=; b=A/JwmEdoP7AWfbD+l+ek5nCr6fXgyx//4GgfG89TZgXeYr8S8OlTU36e5OL6k9kxs5 fNQROsvwoqgea597tHS0YppV2oqGLjxR1BE4giUj//tkhMkrt7WDApS/kVXGd9J+JTKu VJl0vuhySD7KvuKVrW7kBxg4O07d7ht5ncZhcdufAJZg15SV5L1YkqdXPhUiCf1m8fok UdNBtJzx35VIKKHp2ElEtcVmueQSshfpnVwhOUq7DrectYdocD4bLaaHXV3pbFgDyesQ 76Dprd7VsTtO4qPR498BrPOkhu6kxnOndx/vsgKBe6C94/VAzwsXh4ajwqI/v3V02DIe 9Sug==
X-Gm-Message-State: AA6/9RnDsw46ebRrWc/zl2H6pqdUf+jYVtcZuUcreiJUX5Uz2sue64QYcJO2dumE7L0wLmSBF+xIX3EouO+X5Q==
X-Received: by 10.36.47.6 with SMTP id j6mr6097291itj.82.1474671922395; Fri, 23 Sep 2016 16:05:22 -0700 (PDT)
MIME-Version: 1.0
References: <CAOjisRyDx0Wa5tcFT3gN496jhf-AjLfDH4JNN+w70r8jBsxt5g@mail.gmail.com> <CAFewVt4SOTU18xj45i_Eox2g5zaZyTyD6SP86cjBciXpuC+sDw@mail.gmail.com> <CAOjisRwcR3NUCnCsA+kauGNiOz-TAezskYzM8g3V9nxUCFoaWw@mail.gmail.com> <CABcZeBPOsBXv3yCoVrQmfM99JvaD0P=7Wy0EG5wY_d=dTH_Oug@mail.gmail.com> <CAAZdMacihp1pxk76UY2n66ZqDvcOeqS8vm0n3mObkSBVY0PwBg@mail.gmail.com>
In-Reply-To: <CAAZdMacihp1pxk76UY2n66ZqDvcOeqS8vm0n3mObkSBVY0PwBg@mail.gmail.com>
From: Nick Sullivan <nicholas.sullivan@gmail.com>
Date: Fri, 23 Sep 2016 23:05:10 +0000
Message-ID: <CAOjisRwHUSEthSt6Tt6hYRRnhW6snWiZrCS+sN17VnCRz=e5ow@mail.gmail.com>
To: Victor Vasiliev <vasilvv@google.com>, Eric Rescorla <ekr@rtfm.com>
Content-Type: multipart/alternative; boundary="001a1144130c19def2053d34d028"
Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/N-1moFAdKSuOHKpmGNA14lfmBS4>
Cc: "tls@ietf.org" <TLS@ietf.org>
Subject: Re: [TLS] Proposed Change to Certificate message (#654)
X-BeenThere: tls@ietf.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: "This is the mailing list for the Transport Layer Security working group of the IETF." <tls.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/tls>, <mailto:tls-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/tls/>
List-Post: <mailto:tls@ietf.org>
List-Help: <mailto:tls-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tls>, <mailto:tls-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 23 Sep 2016 23:05:26 -0000
Thanks for the suggestions. I've restructured my PR to include an array of SingleCertificate objects in the Certificate structure. Ilari: I agree that the post-hanshake auth mechanism as currently described is a bit lacking, but I'd like to sort this out first. Victor: For cached_info, OCSP responses are relatively long-lived and the server should know whether or not a cached OCSP is close to expiration, so cached_info is still useful, but I agree that this makes it less useful. On Fri, Sep 23, 2016 at 2:53 PM Victor Vasiliev <vasilvv@google.com> wrote: > The version where each certificate gets its own extension sounds like a > step in the right direction. > > One concern I have is the way this would interact with cached_info > extension. Currently, it allows the entire Certificate message to be > cached -- which just meant the entire chain in 1.2. With the suggested > change, this makes less sense: while you still want to cache SCTs, this > might be much less desirable for OCSP responses. > > On Fri, Sep 23, 2016 at 3:49 PM, Eric Rescorla <ekr@rtfm.com> wrote: > >> This seems like a reasonable direction. >> >> -Ekr >> >> >> On Thu, Sep 22, 2016 at 7:26 PM, Nick Sullivan < >> nicholas.sullivan@gmail.com> wrote: >> >>> This suggestion makes sense to me. >>> >>> Both the SCT and OCSP v2 extension allow for multiple objects in order >>> to cover multiple certificates in a chain, but your suggestion makes the >>> grouping much more explicit and obviates the need for OCSPv2. I'd >>> definitely consider a modification like this. >>> >>> Nick >>> >>> On Thu, Sep 22, 2016 at 7:17 PM Brian Smith <brian@briansmith.org> >>> wrote: >>> >>>> Nick Sullivan <nicholas.sullivan@gmail.com> wrote: >>>> >>>>> PR: https://github.com/tlswg/tls13-spec/pull/654 >>>>> >>>> >>>>> This change adds a set of extensions to the Certificate message. With >>>>> this change, the Certificate message can now hold all extension messages >>>>> that are certificate-specific (rather than connection-specific). This >>>>> change also resolves the anomaly of OCSP messages appearing before >>>>> certificates in the handshake. >>>>> >>>> >>>> There are two ways that such a thing could be done. How your proposal >>>> suggests: >>>> >>>> opaque ASN1Cert<1..2^24-1>; >>>> struct { >>>> opaque certificate_request_context<0..2^8-1>; >>>> ASN1Cert certificate_list<0..2^24-1>; >>>> Extension extensions<0..2^16-1>; >>>> } Certificate; >>>> >>>> or: >>>> >>>> opaque ASN1CertData<1..2^24-1>; >>>> struct { >>>> ASN1CertData cert_data; >>>> Extension extensions<0..2^16-1>; >>>> } >>>> >>>> struct { >>>> opaque certificate_request_context<0..2^8-1>; >>>> ASN1Cert certificate_list<0..2^24-1>; >>>> } Certificate; >>>> >>>> I think you are right that the SCT and the OCSP response are >>>> per-certificate. In particular, they are not per-certificate-chain, so to >>>> me the latter form, where each certificate in the chain gets its own >>>> extension list, makes more sense to me. Would you consider changing the >>>> proposal to the second form? >>>> >>>> Cheers, >>>> Brian >>>> -- >>>> https://briansmith.org/ >>>> >>>> >>> _______________________________________________ >>> TLS mailing list >>> TLS@ietf.org >>> https://www.ietf.org/mailman/listinfo/tls >>> >>> >> >> _______________________________________________ >> TLS mailing list >> TLS@ietf.org >> https://www.ietf.org/mailman/listinfo/tls >> >> >
- [TLS] Proposed Change to Certificate message (#65… Nick Sullivan
- Re: [TLS] Proposed Change to Certificate message … Brian Smith
- Re: [TLS] Proposed Change to Certificate message … Nick Sullivan
- Re: [TLS] Proposed Change to Certificate message … Ilari Liusvaara
- Re: [TLS] Proposed Change to Certificate message … Eric Rescorla
- Re: [TLS] Proposed Change to Certificate message … Victor Vasiliev
- Re: [TLS] Proposed Change to Certificate message … Nick Sullivan
- Re: [TLS] Proposed Change to Certificate message … Ilari Liusvaara
- Re: [TLS] Proposed Change to Certificate message … Martin Thomson
- Re: [TLS] Proposed Change to Certificate message … Ilari Liusvaara
- Re: [TLS] Proposed Change to Certificate message … Sean Turner
- Re: [TLS] Proposed Change to Certificate message … Ilari Liusvaara
- Re: [TLS] Proposed Change to Certificate message … Martin Thomson
- Re: [TLS] Proposed Change to Certificate message … Ilari Liusvaara
- Re: [TLS] Proposed Change to Certificate message … Martin Thomson
- Re: [TLS] Proposed Change to Certificate message … Nick Sullivan