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Mon, 31 Oct 2022 15:41:01 +0100 Message-ID: <111cf860-bbda-1c02-a5b7-81c76af7d263@gmx.de> Date: Mon, 31 Oct 2022 15:40:59 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.4.0 To: Justin Richer Cc: HTTP Working Group References: <7A490A89-3B27-4278-9AFA-A5339FF11500@mnot.net> <9feaab79-4da9-cd83-b53e-297fc199624b@gmx.de> <7BE7AA9D-2EFB-44AA-AB56-9C23E0F55AFF@mit.edu> From: Julian Reschke In-Reply-To: <7BE7AA9D-2EFB-44AA-AB56-9C23E0F55AFF@mit.edu> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:MJj04hGYLKHqTdm3sZiiJXo/HRN1v/2ZZ3yjGw9uCvcKXlP9hsI EC35FxHesnFgOQFEu1Z5l2GO05WYgk1PuIU5lEP0obXQcnaZCejPvg63HDboHLM7J6MUFZj yHVQ4xSAXU9Y+8EgrK7aVod1mT1H5BDdpYOp+Ogusm5SWIdpglRn5O8VPSPGkacCmNDfKEU 97H6PqsvSzdwGdca8NYmg== UI-OutboundReport: notjunk:1;M01:P0:IEsnHC5oJpk=;weWoaXAYQrZotRKqiEiqvhK3htJ Jd/g34c/yN4H44KfGw3wji8vCjqsSEE5Pthqc186msRtPiIiRrjrNaWYi1q4d2Fv4N5Ln5cl8 AR1d2S+hM4u1xsqmbAOpXQ4XvdVHdtU/8jEeZ4e24DnmUGvPiwqNqG/6LW4fcZ+2OwecSHxnZ wYLrvpcguf/Yxt27ntHf/zQWvmsALwJbmMdTkNVrzSEXYVW+yKZ6WMKqXnZTWxKHgDRHnO+np xCpei5T+5KN3dtFzNGmjKdb1Qr3SHdXvRLZBsOrAxYAwD4d7h46wtU9sr99U3dgHB2GGGUMpB 2dlePSl75XdEpTpUgb3zhq+L0g8nomECxAK9SNPnjYyjq1X3230nQpkganbzugL8MknTKb428 p36WdWWr4w4pLkCEZDagqwmPqzPNQE8Il8Ti4mepCRexEPROIeLjOEyWmOx4SS/G6DYwSqCTE mEEp2w/sMuN1tYeLOMANX17D5Bdl38CsIylWpvBw8LNffy9nrmo4l1DrvsWDn666Se+Hb08rM FBJh493IpQNGDWO/tS05MNrXt+IwabzRRAqL9OT30JWBudjuBswxsik5SXJHA8eS9v1EM6RzE 0PnFgYZTuJwyZ5Xk8vCPCN5QamqQWDqz8Ly0ZCSDRIyVInEfXFkk21BpqDs5uR9FMsvVk09cB PBGKotmBVc+Gf3miXFE/5v97LOTtmNgAXuzPAaDfXq5968RHCVXFtMbHPrUqreqA+S3ruZmH/ LyBmcvkkcwehIxh7Jpmt0fHqS2gwqLgjHrV89jx/ZJS8XNihh1aNqeOG3CuSwAV5EDR/ZhJY7 Z21PvS3HUwMsTfsuPqMY0HI742zPOkfjxsG4F5w6p2tZfJAF8g/u0GGdIF885f1I8HN6maKqa pqgLggmNiQ0fZJIeADnQA/1G9f/5+khLaZN1g0XC64O1pfcvmZp1U5+vyLjksfyVK1YE3OmUF R0xePkgZxeny2FQJLYbfQcPJLJ4= Received-SPF: pass client-ip=212.227.15.15; envelope-from=julian.reschke@gmx.de; helo=mout.gmx.net X-W3C-Hub-DKIM-Status: validation passed: (address=julian.reschke@gmx.de domain=gmx.de), signature is good X-W3C-Hub-Spam-Status: No, score=-5.8 X-W3C-Hub-Spam-Report: BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, W3C_AA=-1, W3C_IRA=-1, W3C_WL=-1 X-W3C-Scan-Sig: mimas.w3.org 1opVyW-004rD6-OO 30f102d65cb4a089f6d7792aee6ea89e X-Original-To: ietf-http-wg@w3.org Subject: Re: combined field value, Re: Working Group Last Call: draft-ietf-httpbis-message-signatures-13 Archived-At: Resent-From: ietf-http-wg@w3.org X-Mailing-List: archive/latest/40513 X-Loop: ietf-http-wg@w3.org Resent-Sender: ietf-http-wg-request@w3.org Precedence: list List-Id: List-Help: List-Post: List-Unsubscribe: Am 31.10.2022 um 15:33 schrieb Justin Richer: > Hi Julian, thanks for this writeup of this issue. Multiple-valued fields= have been potentially trouble from the start of this work many years ago. > > After re-reading the text in RFC9110 section 5, but especially 5.3, the = normalization rules are consistent with the advice of " For consistency, u= se comma SP=E2=80=9D, but an intermediary could in fact combine field valu= es without spaces on the way through. I think what we want to do is someth= ing like: > > > HTTP fields that are known to be "list-based fields=E2=80=9D by the si= gner or verifier which have multiple values MUST have all values combined = using the delimiter of =E2=80=9Ccomma =E2=80=9D as suggested by RFC911= 0. > > So it=E2=80=99s still the =E2=80=9Ccombined value=E2=80=9D but it=E2=80= =99s got very specific rails around it. What do you think of this approach= ? > > I agree that we might want to revisit this text in the HTTP semantics do= cument, too. In my own limited practical experience, whenever the librarie= s I=E2=80=99ve used offer a pre-combined value, it always does the combina= tion with =E2=80=9Ccomma =E2=80=9D, as shown in both examples and in t= he non-normative recommendations. I think that the fact that the examples = do the same, in spite of the normative text technically allowing other opt= ions, is a practical consideration for implementors. > > =E2=80=94 Justin Well, there's nothing in the spec that guarantees that this (adding the OPTIONAL SP) will happen. I'm not sure it's a good idea to rely on it. A sender can always make things robust by making sure that there's only a single instance of the field... Best regards, Julian