Re: [dns-privacy] ODoH RFC SetupBaseS clarification
Ravi sankar MANTHA <r.mantha@f5.com> Fri, 12 August 2022 17:36 UTC
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From: Ravi sankar MANTHA <r.mantha@f5.com>
To: Tommy Pauly <tpauly=40apple.com@dmarc.ietf.org>, Ravi sankar MANTHA <r.mantha=40f5.com@dmarc.ietf.org>
CC: "dns-privacy@ietf.org" <dns-privacy@ietf.org>
Thread-Topic: [dns-privacy] ODoH RFC SetupBaseS clarification
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dns-privacy/WKZOjd-xM-ZH_9igR_dLlAnLcQI>
Subject: Re: [dns-privacy] ODoH RFC SetupBaseS clarification
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Hi tommy, all, Apologies for the duplicate mail, Yes this was discussed and got clarified. Thanks, Ravi Mantha ________________________________ From: dns-privacy <dns-privacy-bounces@ietf.org> on behalf of Tommy Pauly <tpauly=40apple.com@dmarc.ietf.org> Sent: Friday, August 12, 2022 8:41:54 PM To: Ravi sankar MANTHA <r.mantha=40f5.com@dmarc.ietf.org> Cc: dns-privacy@ietf.org <dns-privacy@ietf.org> Subject: Re: [dns-privacy] ODoH RFC SetupBaseS clarification EXTERNAL MAIL: dns-privacy-bounces@ietf.org Hi Ravi, Seems like this was stuck in your outbox and sent a duplicate email to the one from August 10? Tommy On Aug 10, 2022, at 1:40 AM, Ravi sankar MANTHA <r.mantha=40f5.com@dmarc.ietf.org> wrote: Hi, In Section 6.2 of RFC 9230, its mentioned that SetupBaseS takes only 2 parameters (pkR, "odoh query") However, reference implementations are indeed using a randomiser from client side. enc, ctxI, err := hpke.SetupBaseS(suite, rand.Reader, pkR, []byte(ODOH_LABEL_QUERY)) (https://github.com/cloudflare/odoh-go/blob/7c6d9ff448c53e0e546f2afe915ad9608e11f7bd/odoh.go#L471<https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fcloudflare%2Fodoh-go%2Fblob%2F7c6d9ff448c53e0e546f2afe915ad9608e11f7bd%2Fodoh.go%23L471&data=05%7C01%7Cr.mantha%40f5.com%7C694f7bacfa6247298d4508da7c7566f4%7Cdd3dfd2f6a3b40d19be0bf8327d81c50%7C0%7C0%7C637959140947124907%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=C11E3u8gNDMTJ9rEc1BMRspPv82AoSGvXGnd2jio7mU%3D&reserved=0>) This has an implication on target implementations, If Targets assume the randomizer is not present in shared secret derivation, then Context is unique for Target Public Key and they may choose not to store/derive it per message per Public Key. If random seed is present, then contexts are unique only per message (DSN Query). So, this has an interoperability impact as Encrypt/Decrypt fails for Query Responses if wrong shared key/Context is used on Target side. IMHO, we might need to clarify this in RFC either by updating pseudocode for SetupBaseS or add a note that Target should derive shared secret/Context with every oblivious DNS query. Or its implicit somewhere in the RFC ? Regards, Ravi Mantha _______________________________________________ dns-privacy mailing list dns-privacy@ietf.org<mailto:dns-privacy@ietf.org> https://www.ietf.org/mailman/listinfo/dns-privacy<https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fdns-privacy&data=05%7C01%7Cr.mantha%40f5.com%7C694f7bacfa6247298d4508da7c7566f4%7Cdd3dfd2f6a3b40d19be0bf8327d81c50%7C0%7C0%7C637959140947124907%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Q7IkRtWtX%2BppWg9T47WRemPtBtKHmjAC%2BriX1%2B91bhM%3D&reserved=0>
- [dns-privacy] ODoH RFC SetupBaseS clarification Ravi sankar MANTHA
- Re: [dns-privacy] ODoH RFC SetupBaseS clarificati… Tommy Pauly
- Re: [dns-privacy] ODoH RFC SetupBaseS clarificati… Ravi sankar MANTHA