Re: [Rats] Last Call: <draft-ietf-rats-yang-tpm-charra-12.txt> (A YANG Data Model for Challenge-Response-based Remote Attestation Procedures using TPMs) to Proposed Standard
tom petch <daedulus@btconnect.com> Fri, 25 March 2022 15:36 UTC
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To: "Eric Voit (evoit)" <evoit@cisco.com>, Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
References: <164217699418.11825.9399537345020124861@ietfa.amsl.com> <61E7F4E1.90002@btconnect.com> <BL0PR11MB3122393BC167FDFA512EB43DA1229@BL0PR11MB3122.namprd11.prod.outlook.com> <62063C61.2020008@btconnect.com> <62064DC8.1000505@btconnect.com>
Cc: "rdd@cert.org" <rdd@cert.org>, "rats-chairs@ietf.org" <rats-chairs@ietf.org>, "Nancy Cam-Winget (ncamwing)" <ncamwing@cisco.com>, "rats@ietf.org" <rats@ietf.org>, "nancy.winget@gmail.com" <nancy.winget@gmail.com>, "draft-ietf-rats-yang-tpm-charra@ietf.org" <draft-ietf-rats-yang-tpm-charra@ietf.org>
From: tom petch <daedulus@btconnect.com>
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Date: Fri, 25 Mar 2022 15:36:11 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rats/Z1L9pYQG7_8MX0Q0PNWXT8Ycmkw>
Subject: Re: [Rats] Last Call: <draft-ietf-rats-yang-tpm-charra-12.txt> (A YANG Data Model for Challenge-Response-based Remote Attestation Procedures using TPMs) to Proposed Standard
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On 11/02/2022 11:51, tom petch wrote: > On 11/02/2022 10:37, tom petch wrote: > > Eric Eric Me again. Looking at -18: - the changes from my comment about YANG import needing a Normative Reference hasn't quite had the effect I intended. Yes, as per RFC8407, the Normative Reference is there but the YANG 'reference 'statement is not e.g. from tcpm-yang-tcp import ietf-inet-types { prefix "inet"; reference "RFC 6991: Common YANG Data Types."; } import ietf-netconf-acm { prefix nacm; reference "RFC 8341: Network Configuration Access Control Model"; } Where the reference is to an I-D, the usual practice is still to include a reference e.g. import ietf-tcp-common { prefix "tcpcmn"; reference "I-D.ietf-netconf-tcp-client-server: YANG Groupings for TCP Clients and TCP Servers."; Also I see 'Ref AAAA Appendix B' with no note as to what AAAA is or will be; perhaps an RFC Editor note would clarify Tom Petch > And following up on my other comments > > <CODE BEGINS> file "ietf-tpm-remote-attestation@2022-11-16.yang" > interesting date > > YANG 'import' must have a YANG 'reference' clause > e.g. > import ietf-inet-types { > prefix inet; > reference "RFC6991: Common YANG Data Types"; > > > TLP in the YANG modules is out of date. > > Copyright references 2021 > > >> "Defines a specific instance of an event log entry > >> and corresponding to the information used to > >> extended the PCR"; > > / and corresponding to the information used to > extended the PCR/ corresponding to the information used to extend the PCR/ > perhaps > > My thinking on NACM was that the statement would actually appear in the > YANG as you can see in draft-ietf-tcpm-yang-tcp > > Tom Petch > > >> On 28/01/2022 20:56, Eric Voit (evoit) wrote: >>> Hi Tom, >>> Hi Henk, >>> >>> Tom: from your other thread, the requested references from the YANG >>> model >>> have been updated throughout the document as requested. We will post >>> a new >>> version as soon as the other topics below are covered to your >>> satisfaction. >>> >>> Henk: there is one change I hope you can help with. Search on **Henk. >>> >>>> From: tom petch, January 19, 2022 6:24 AM >>>> >>>> These comments are separate from my previous comments on references >>>> in the >>>> YANG modules. That said, >>>> >>>> 'import' in YANG module must have a YANG reference clause which must >>>> be a >>>> Normative Reference in the I-D Reference. >>> >>> This has been updated as part of references fix from your other >>> email. And >>> new text inserted prior to each YANG model describes the embedded >>> references >>> from the draft's Normative list. >>> >>>> ietf-hardware must has a prefix of 'hw' as per RFC8348 throughout >>>> the I-D >>> >>> Change made. >>> >>>> /http:datatracker/https:/datatracker/ >>>> in both modules >>> >>> Change made. >>> >>>> reference >>>> "draft-ietf-rats-yang-tpm-charra"; >>>> perhaps >>>> reference >>>> "RFC XXXX: A YANG Data Model for Challenge-Response-based >>>> Remote >>>> Attestation Procedures using TPMs"; >>> >>> Change made. >>> >>>> identity attested_event_log_type { >>>> description >>>> "Base identity allowing categorization of the reasons why >>>> and >>> /and/an/ ? >>> >>> Change made. >>> >>>> leaf TPMS_QUOTE_INFO { >>>> most YANG identifiers have been changed to lower case; should this >>>> one be? >>> >>> Multiple review discussions have driven this to be upper case because >>> there >>> is a 1:1 correspondence with an identical object defined by TCG. >>> >>>> grouping boot-event-log { >>>> could do with more explanation and/or references for this. >>> >>> I made the group description: >>> "Defines a specific instance of an event log entry >>> and corresponding to the information used to >>> extended the PCR"; >>> >>> e.g. are there >>>> semantics for the uint32 event-type? >>> >>> ** Henk, can you improve this ietf-tpm-remote-attestation.yang leaf >>> description with a reference: >>> >>> leaf event-type { >>> type uint32; >>> description >>> "log event type"; >>> } >>> >>>> Security Considerations mention the use of NACM; should the RPC have a >>>> default deny-all? >>> >>> Added "with a default setting of deny-all". >>> >>>> leaf physical-index { >>>> should this reference the YANG RFC8348 rather than the SMI equivalent? >>> >>> It could. The initial requirement was driven by someone who wanted to >>> allow >>> operations to make an easy mapping to corresponding Entity MIB data they >>> currently used. In the end the populated info will be the same. >>> >>>> leaf manufacturer { >>>> these are often modelled as Privat Enterprise Numbers as registered >>>> with >>> IANA - >>>> see e.g. draft-ietf-dots-telemetry >>> >>> This could be done. Nobody in the WG suggested a purpose for >>> leveraging a >>> mechanized list of values here. I expect the major use would be for >>> manual >>> debugging / manual checking if something went wrong. Certainly a formal >>> list could be maintained. It just didn't seem important yet. >>> >>>> reference >>>> "RFC XXXX: tbd"; >>>> as above >>> >>> Updated. >>> >>>> identity tpm20 { >>>> if-feature "tpm12"; >>>> looks odd - if correct then worth an explanatory note >>> >>> Fixed. >>> >>> Eric >>> >>>> Tom Petch >>>> >>>> On 14/01/2022 16:16, The IESG wrote: >>>>> >>>>> The IESG has received a request from the Remote ATtestation ProcedureS >>>>> WG >>>>> (rats) to consider the following document: - 'A YANG Data Model for >>>>> Challenge-Response-based Remote Attestation >>>>> Procedures using TPMs' >>>>> <draft-ietf-rats-yang-tpm-charra-12.txt> as Proposed Standard >>>>> >>>>> The IESG plans to make a decision in the next few weeks, and solicits >>>>> final comments on this action. Please send substantive comments to the >>>>> last-call@ietf.org mailing lists by 2022-01-28. Exceptionally, >>>>> comments may be sent to iesg@ietf.org instead. In either case, please >>>>> retain the beginning of the Subject line to allow automated sorting. >>>>> >>>>> Abstract >>>>> >>>>> >>>>> This document defines YANG RPCs and a small number of >>>>> configuration >>>>> nodes required to retrieve attestation evidence about integrity >>>>> measurements from a device, following the operational context >>> defined >>>>> in TPM-based Network Device Remote Integrity Verification. >>>>> Complementary measurement logs are also provided by the YANG >>>>> RPCs, >>>>> originating from one or more roots of trust for measurement >>>>> (RTMs). >>>>> The module defined requires at least one TPM 1.2 or TPM 2.0 as >>>>> well >>>>> as a corresponding TPM Software Stack (TSS), included in the >>>>> device >>>>> components of the composite device the YANG server is running on. >>>>> >>>>> >>>>> >>>>> >>>>> The file can be obtained via >>>>> https://datatracker.ietf.org/doc/draft-ietf-rats-yang-tpm-charra/ >>>>> >>>>> >>>>> >>>>> No IPR declarations have been submitted directly on this I-D. >>>>> >>>>> >>>>> The document contains these normative downward references. >>>>> See RFC 3967 for additional information: >>>>> draft-ietf-rats-tpm-based-network-device-attest: TPM-based >>>>> Network >>>> Device Remote Integrity Verification (None - Internet Engineering Task >>> Force >>>> (IETF)) >>>>> draft-ietf-rats-architecture: Remote Attestation Procedures >>>>> Architecture (None - Internet Engineering Task Force (IETF)) >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> IETF-Announce mailing list >>>>> IETF-Announce@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/ietf-announce >>>>> . >>>>>
- [Rats] Last Call: <draft-ietf-rats-yang-tpm-charr… The IESG
- Re: [Rats] Last Call: <draft-ietf-rats-yang-tpm-c… tom petch
- Re: [Rats] Last Call: <draft-ietf-rats-yang-tpm-c… tom petch
- Re: [Rats] Last Call: <draft-ietf-rats-yang-tpm-c… Eric Voit (evoit)
- Re: [Rats] Last Call: <draft-ietf-rats-yang-tpm-c… tom petch
- Re: [Rats] Last Call: <draft-ietf-rats-yang-tpm-c… tom petch
- Re: [Rats] Last Call: <draft-ietf-rats-yang-tpm-c… Eric Voit (evoit)
- Re: [Rats] Last Call: <draft-ietf-rats-yang-tpm-c… Eric Voit (evoit)
- Re: [Rats] Last Call: <draft-ietf-rats-yang-tpm-c… tom petch