Re: [sipcore] Alexey Melnikov's No Objection on draft-ietf-sipcore-digest-scheme-12: (with COMMENT)
Rifaat Shekh-Yusef <rifaat.ietf@gmail.com> Thu, 31 October 2019 13:47 UTC
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From: Rifaat Shekh-Yusef <rifaat.ietf@gmail.com>
Date: Thu, 31 Oct 2019 09:47:23 -0400
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To: Christer Holmberg <christer.holmberg@ericsson.com>
Cc: Alexey Melnikov <aamelnikov@fastmail.fm>, "sipcore-chairs@ietf.org" <sipcore-chairs@ietf.org>, "draft-ietf-sipcore-digest-scheme@ietf.org" <draft-ietf-sipcore-digest-scheme@ietf.org>, The IESG <iesg@ietf.org>, SIPCORE <sipcore@ietf.org>
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Subject: Re: [sipcore] Alexey Melnikov's No Objection on draft-ietf-sipcore-digest-scheme-12: (with COMMENT)
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Christer, This IMS behavior would have been in violation of RFC3261 which specified exactly 32 Hex characters. So, this change should not make much of a difference in this case. Regards, Rifaat On Thu, Oct 31, 2019 at 9:37 AM Christer Holmberg < christer.holmberg@ericsson.com> wrote: > > > Hi, > > > > The reason for the empty value comes from IMS and AKA, where you need to > include the user id already in the initial REGISTER request (this seems to > be missing from RFC 3310, but that’s a separate topic) in order for the > server to create the challenge, meaning that in the initial REGISTER > request you include an Authorization header field with the username > parameter carrying the IMS private user identity, the realm parameter and > the uri parameter. At this point you obviously don’t yet have the response, > so in IMS it is specified that the response parameter is inserted with an > empty value. > > > > WHY it was specified that way (instead of simply not including the > response parameter) I don’t know, but I do know that it has been > implemented and deployed that way for many years. > > > > Regards, > > > > Christer > > > > > > *From: *sipcore <sipcore-bounces@ietf.org> on behalf of Rifaat > Shekh-Yusef <rifaat.ietf@gmail.com> > *Date: *Thursday, 31 October 2019 at 15.20 > *To: *Alexey Melnikov <aamelnikov@fastmail.fm> > *Cc: *"sipcore-chairs@ietf.org" <sipcore-chairs@ietf.org>, " > draft-ietf-sipcore-digest-scheme@ietf.org" < > draft-ietf-sipcore-digest-scheme@ietf.org>, "iesg@ietf.org" <iesg@ietf.org>, > "sipcore@ietf.org" <sipcore@ietf.org> > *Subject: *Re: [sipcore] Alexey Melnikov's No Objection on > draft-ietf-sipcore-digest-scheme-12: (with COMMENT) > > > > Done. > > > > On Thu, Oct 31, 2019 at 9:13 AM Alexey Melnikov <aamelnikov@fastmail.fm> > wrote: > > On Thu, Oct 31, 2019, at 1:11 PM, Rifaat Shekh-Yusef wrote: > > Hi Alexey, > > > > I am fine with Paul's suggestion. > > Are you ok with "32*LHEX"? > > Yes! > > > > Thank you, > > Alexey > > > > Regards, > > Rfaat > > > > > > On Thu, Oct 31, 2019 at 7:22 AM Alexey Melnikov <aamelnikov@fastmail.fm> > wrote: > > > > Hi Rifaat, > > > > On Wed, Oct 30, 2019, at 9:50 PM, Rifaat Shekh-Yusef wrote: > > Thanks Alexey! > > > > I am fine with the first two comments, and will fix these in the coming > version of the document. > > > > I am not sure I follow the 3rd one. Why do you see the need for a minimum > number of hex digits? > > You do say that the number of hex digits match the hash lenght, so it is > probably Ok. However empty value is never valid (and I am worried it might > hit some boundary condition bug in implementations), so prohibiting it in > ABNF would be the best. > > > > Best Regards, > > Alexey > > > > Regards, > > Rifaat > > > > > > > > On Wed, Oct 30, 2019 at 1:16 PM Alexey Melnikov via Datatracker < > noreply@ietf.org> wrote: > > Alexey Melnikov has entered the following ballot position for > > draft-ietf-sipcore-digest-scheme-12: No Objection > > > > When responding, please keep the subject line intact and reply to all > > email addresses included in the To and CC lines. (Feel free to cut this > > introductory paragraph, however.) > > > > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > > for more information about IESG DISCUSS and COMMENT positions. > > > > > > The document, along with other ballot positions, can be found here: > > https://datatracker.ietf.org/doc/draft-ietf-sipcore-digest-scheme/ > > > > > > > > ---------------------------------------------------------------------- > > COMMENT: > > ---------------------------------------------------------------------- > > > > I am agreeing with Alissa's DISCUSS. > > > > Also, I have a few comments of my own: > > > > 1) Last para of Section 2.1: > > > > 2.1. Hash Algorithms > > > > A UAS prioritizes which algorithm to use based on the ordering of the > > challenge header fields in the response it is preparing. > > > > This looks either wrong or confusing to me. I think you are just saying > here > > that the order is decided by the server at this point. > > > > That > > process is specified in section 2.3 and parallels the process used in > > HTTP specified by [RFC7616]. > > > > So based on the above, my suggested replacement for both sentences: > > > > A UAS prioritizes which algorithm to use based on its policy, > > which is specified in section 2.3 and parallels the process used in > > HTTP specified by [RFC7616]. > > > > 2) Last para of Section 2.4: > > > > If the UAC cannot respond to any of the challenges in the response, > > then it SHOULD abandon attempts to send the request unless a local > > policy dictates otherwise. > > > > Is trying other non Digest algorithms covered by "SHOULD abandon"? > > If yes, maybe you should make this clearer. > > > > For example, if the UAC does not have > > credentials or has stale credentials for any of the realms, the UAC > > will abandon the request. > > > > 3) In Section 2.7: > > > > request-digest = LDQUOT *LHEX RDQUOT > > > > This now allows empty value. I suggest you specify a minimum number of hex > > digits allowed in the ABNF. Or at least change "*LHEX" to "2*LHEX". > > > > > > > > > >
- [sipcore] Alexey Melnikov's No Objection on draft… Alexey Melnikov via Datatracker
- Re: [sipcore] Alexey Melnikov's No Objection on d… Rifaat Shekh-Yusef
- Re: [sipcore] Alexey Melnikov's No Objection on d… Paul Kyzivat
- Re: [sipcore] Alexey Melnikov's No Objection on d… Alexey Melnikov
- Re: [sipcore] Alexey Melnikov's No Objection on d… Rifaat Shekh-Yusef
- Re: [sipcore] Alexey Melnikov's No Objection on d… Alexey Melnikov
- Re: [sipcore] Alexey Melnikov's No Objection on d… Rifaat Shekh-Yusef
- Re: [sipcore] Alexey Melnikov's No Objection on d… Christer Holmberg
- Re: [sipcore] Alexey Melnikov's No Objection on d… Rifaat Shekh-Yusef
- Re: [sipcore] Alexey Melnikov's No Objection on d… Christer Holmberg
- Re: [sipcore] Alexey Melnikov's No Objection on d… Christer Holmberg
- Re: [sipcore] Alexey Melnikov's No Objection on d… Rifaat Shekh-Yusef
- Re: [sipcore] Alexey Melnikov's No Objection on d… Christer Holmberg
- Re: [sipcore] Alexey Melnikov's No Objection on d… Rifaat Shekh-Yusef
- Re: [sipcore] Alexey Melnikov's No Objection on d… Christer Holmberg
- Re: [sipcore] Alexey Melnikov's No Objection on d… Alexey Melnikov
- Re: [sipcore] Alexey Melnikov's No Objection on d… Christer Holmberg
- Re: [sipcore] Alexey Melnikov's No Objection on d… Rifaat Shekh-Yusef
- Re: [sipcore] Alexey Melnikov's No Objection on d… Christer Holmberg
- Re: [sipcore] Alexey Melnikov's No Objection on d… Rifaat Shekh-Yusef
- Re: [sipcore] Alexey Melnikov's No Objection on d… Christer Holmberg
- Re: [sipcore] Alexey Melnikov's No Objection on d… Rifaat Shekh-Yusef
- Re: [sipcore] Alexey Melnikov's No Objection on d… Paul Kyzivat
- Re: [sipcore] Alexey Melnikov's No Objection on d… Christer Holmberg