Re: [Insipid] AD Evaluation of draft-ietf-insipid-session-id-22
"Ben Campbell" <ben@nostrum.com> Wed, 25 May 2016 19:57 UTC
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From: Ben Campbell <ben@nostrum.com>
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Date: Wed, 25 May 2016 14:57:28 -0500
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Subject: Re: [Insipid] AD Evaluation of draft-ietf-insipid-session-id-22
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Authors, any thoughts on these? Thanks! Ben. On 14 May 2016, at 19:46, Ben Campbell wrote: > Hi, > > This is my AD Evaluation of draft-ietf-insipid-session-id-22. I have a > number of comments, and think that at least the "substantive" comments > should be addressed prior to IETF last call. > > Thanks! > > Ben. > > ------------- Substantive Comments: > > - Abstract: The abstract makes it sound like the draft is > multi-protocol. It's not, it's SIP specific. I recognize the idea is > that the syntax could be used across signaling protocols, but this > particular draft only defines how to do so for SIP. Please clarify. > > - General > > - 4.1, 2nd paragraph: Why is the requirement for version 4 or 5 UUIDs > only a SHOULD? It seems like we should really avoid any sort of > persistent identifies in the UUID. If we really need the SHOULD, please > describe when it might be reasonable to choose otherwise. > > - 4.2, 2nd paragraph: "such as when a UA first initiates a SIP request," > > Should that be a SIP INVITE request, or SIP dialog-initiating request? > > -- 2nd to last paragraph: Is there a normative statement elsewhere than > devices other than conference-focuses MUST NOT reuse UUIDs? (Also, the > MUST in this paragraph belongs with the section on MDUs. If this text > means to simply point out that the MDU section has this requirement, > then please state it descriptively here.) > > -- last paragraph: I'm a bit uncomfortable with making storage > completely out of scope, due to the potential "information-at-rest" > security or privacy implications. (I note that RFC7206 cites 6872 for > this purpose). > > - 6, paragraph 8: Has the working group discussed the privacy > implications of requiring an endpoint to keep the same UUID after a > redirect, refer, or INVITE-with-replaces? It may be that the peer and > intermediaries already know the source of the 2nd dialog is the same > that of the first, but I think it's a topic that needs some mention in > the text. > > -- paragraph 10: Both the MAY and MUST seem incorrect here. The MAY is a > statement of fact, and the MUST is a description of rules elsewhere in > the draft. I suggest using descriptive language for both. > > -7, first paragraph: Does the assumption of no "special treatment" means > the intermediary passing the session-id unchanged? Removes it? Either? > > -- 4th paragraph: What happens when a B2BUA that does not implement > session-id aggregates responses? If it passes through the peer UUIDs > unchanged, does anything break? Can the UAC be misled about the UUID of > the resulting peer? > > -- 3rd paragraph from end: I'm confused by "A non- redirected or > rejected response", since responses neither get redirected or rejected. > Do you mean a redirection response or a rejection response? (Perhaps > using response code classes would be more clear.) > > "MUST replace its own UUID" - In what message(s)? > > -- 2nd to last paragraph: Why are the SHOULDs not MUSTs? Can you > describe situations in which one might reasonably not follow the > SHOULDs? > > -- last paragraph: The first "MAY" seems like a statement of fact. Is > the 2nd MAY appropriate? That is, intermediary allowed to _not_ do this, > and let endpoints get out of sync? > > -8, last paragraph: Why is the SHOULD not a MUST? When might one > reasonably not follow it? > > -9, 2nd paragraph: Does this assume that the conference is new to each > subsequent MCU? That is, one would never use this approach to bridge two > existing conferences that already have their own UUIDs? > > - 10.3: Why doesn't the b2bua send a re-invite to update the uuid as in > the next example? > > - 10.5: Please don't use the name of a trademarked, commercial service > in an RFC. Can you recast this as a "web-based conference service"? > > Also, this should be clarified to be one of many ways to implement this > use case, not necessarily a preferred way. (For example, endpoints > might initiate the INVITE requests toward the focus.) > > - 10.7, first bullet: It seems highly unlikely that a 3pcc server would > not be dialog stateful. > > - 11: This section creates MUST level requirements for an implementation > to be backwards compatible with a pre-standard, proprietary version. > That seems to be a stretch. Did the working group really intend that an > implementation could not choose not to implement this section? > > -- 4th bullet: Wny isn't the presence or absence of remote-uuid > sufficient for responses? > > -- 5th bullet: This seems out of place; it's about non-compliant > implementations of this document, not about backwards compatibility. > > - 6th bullet: Why would an "old" implementation include "remote-uuid" at > all? > > - 12, first paragraph: The MUST here seems to conflict with the previous > SHOULD about using UUID versions other than 4 or 5. (see previous > comment). > > -- 3rd paragraph: Is there an impact if something tampers with or lies > about session-Id values? > > - 15: Thank you for including this. > > Editorial Comments and Nits: > > -1, first paragraph: Please expand SIP on first mention. > > - 4.2, 4th paragraph: Please expand PBX on first mention. > > -- 2nd to last paragraph: This referes to conference focus, but most of > the relevant section discusses MDUs. Please use consistent terms. > (either may be okay, but "focus" probably better captures the signaling > vs media role.) > > -6, paragraph 9: What is meant by "negatively affect"? Is this allowed > to affect the session in neutral or positive ways? > > -- paragraph 11: Consider s/"MUST take care to ensure"/"MUST ensure". > The "take care" part softens the message. > > -- 2nd to last paragraph: Redundant normative statements. Consider > making the first one descriptive, since the second is the more precise > of the two. (This pattern repeats in section 7 paragraph 7) > > - 7, 2nd paragraph: "which is why intermediaries" I think that's one > reason why. There are likely others. > > -- 7th paragraph: "If an intermediary receives a SIP message without a > Session-ID header field or valid header field value..." > > Does this mean either without session-id, or with session-Id but without > a valid value? (As worded, the second part reads like it means without > any valid header fields, but that doesn't make sense.) > > -8, first paragraph: This seems redundant to previous sections. > > 10.1, paragraph before SIP detail: It's not really complete if you omit > stuff :-) > > 10.3: There's no description of the initial re-invite. > > 11, paragraph 5: It's not clear what "that" refers to. > > > > > > > > > > _______________________________________________ > insipid mailing list > insipid@ietf.org > https://www.ietf.org/mailman/listinfo/insipid
- [Insipid] AD Evaluation of draft-ietf-insipid-ses… Ben Campbell
- Re: [Insipid] AD Evaluation of draft-ietf-insipid… Ben Campbell
- Re: [Insipid] AD Evaluation of draft-ietf-insipid… Paul E. Jones
- Re: [Insipid] AD Evaluation of draft-ietf-insipid… Ben Campbell
- Re: [Insipid] AD Evaluation of draft-ietf-insipid… Paul Giralt (pgiralt)
- Re: [Insipid] AD Evaluation of draft-ietf-insipid… Paul Giralt
- Re: [Insipid] AD Evaluation of draft-ietf-insipid… Ben Campbell
- Re: [Insipid] AD Evaluation of draft-ietf-insipid… Ben Campbell
- Re: [Insipid] AD Evaluation of draft-ietf-insipid… Paul Giralt (pgiralt)