Hi Tom, I added a few PRs to address your review (see https://github.com/tlswg/dtls-conn-id/pulls).
Regarding the zero-length CID I believe the current version in the repo at https://github.com/tlswg/dtls-conn-id might have already address your remark. In general, the zero-length CID in the ClientHello / ServerHello allows us to use CIDs unidirectionally. Ciao Hannes -----Original Message----- From: TLS <tls-boun...@ietf.org> On Behalf Of Thomas Fossati Sent: Friday, March 12, 2021 11:58 AM To: tom petch <daedu...@btconnect.com>; last-c...@ietf.org Cc: tls@ietf.org; tls-cha...@ietf.org; draft-ietf-tls-dtls-connection...@ietf.org Subject: Re: [TLS] Last Call: <draft-ietf-tls-dtls-connection-id-10.txt> (Connection Identifiers for DTLS 1.2) to Proposed Standard Hi Tom, Thanks very much! Your review is tracked in the issues below. On 12/03/2021, 10:39, "tom petch" <daedu...@btconnect.com> wrote: > > Some editorial quirks > > s.2 > lacks the boiler plate of RFC8174 https://github.com/tlswg/dtls-conn-id/issues/88 > s.3 > I found this unclear until I had understood it all (or perhaps I do > not understand it) > > "...or again, alternately, to use a zero-length CID)." > This suggests that a zero length CID is valid in Application Data > which later text seems to contradict; otherwise I cannot see what this is > saying. > > " If DTLS peers have negotiated the use of a CIDs using the > ClientHello and the ServerHello messages " > arguably sending a zero CID and receiving a zero CID is a successful > Hello negotiation perhaps " If DTLS peers have negotiated the use of a > non-zero CID in at least one direction, using the ClientHello and the > ServerHello messages" > > "The DTLS peers determine whether incoming and outgoing messages need.." > seems not to cater for unidirectional CIDs; perhaps "The DTLS peers > determine whether incoming or outgoing, or both, messages need.. " https://github.com/tlswg/dtls-conn-id/issues/89 > s.4 > /always recieve CIDs/always receive CIDs/ > > > s.5.1 > "the with Encrypt-then-MAC processing described in [RFC7366]." > I do not understand why 'with' is needed > > s.5.2 > ditto > > s.8 > /this aspects SHOULD refuse/these aspects SHOULD refuse/ https://github.com/tlswg/dtls-conn-id/issues/90 > s.10 > I would find this clearer as three sections for the three IANA actions > 10.1 new column for ExtensionType > 10.2 new value for ExtensionType > 10.3 new value for ContentType > > " IANA is requested to allocate an entry to the existing TLS > "ExtensionType Values" registry, defined in [RFC5246],.." > well no; whatever you think of RFC8447 the name has changed > " IANA is requested to allocate an entry to the existing "TLS > ExtensionType Values" registry, defined in [RFC5246],.." > or, if you are picky (which I am not), > IANA is requested to allocate an entry to the existing "TLS > "ExtensionType Values" registry, defined in [RFC5246], and > renamed by RFC8447 > > An extra column is added but I cannot see what value should be placed > in that column for existing entries. > > "The tls12_cid ContentType is only applicable to DTLS 1.2." > Good information but I struggle to see what IANA will do with it; I > see nowhere for it to go. https://github.com/tlswg/dtls-conn-id/issues/91 cheers, t > Tom Petch > > > On 08/03/2021 11:19, The IESG wrote: > > > > > > The IESG has received a request from the Transport Layer Security WG > > (tls) to consider the following document: - 'Connection Identifiers for > > DTLS 1.2' > > <draft-ietf-tls-dtls-connection-id-10.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-c...@ietf.org mailing lists by 2021-03-28. > > Exceptionally, comments may be sent to i...@ietf.org instead. In > > either case, please retain the beginning of the Subject line to allow > > automated sorting. > > > > Abstract > > > > > > This document specifies the Connection ID (CID) construct for the > > Datagram Transport Layer Security (DTLS) protocol version 1.2. > > > > A CID is an identifier carried in the record layer header that gives > > the recipient additional information for selecting the appropriate > > security association. In "classical" DTLS, selecting a security > > association of an incoming DTLS record is accomplished with the help > > of the 5-tuple. If the source IP address and/or source port changes > > during the lifetime of an ongoing DTLS session then the receiver will > > be unable to locate the correct security context. > > > > > > > > > > The file can be obtained via > > https://datatracker.ietf.org/doc/draft-ietf-tls-dtls-connection-id/ > > > > > > > > No IPR declarations have been submitted directly on this I-D. > > > > > > > > > > > > _______________________________________________ > > IETF-Announce mailing list > > ietf-annou...@ietf.org > > https://www.ietf.org/mailman/listinfo/ietf-announce > > . > > > IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. _______________________________________________ TLS mailing list TLS@ietf.org https://www.ietf.org/mailman/listinfo/tls IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. _______________________________________________ TLS mailing list TLS@ietf.org https://www.ietf.org/mailman/listinfo/tls
