Re: [alto] Roman Danyliw's Discuss on draft-ietf-alto-new-transport-17: (with DISCUSS and COMMENT)

[[e-mail]]

Hi Roman, 

This is a nudge to check whether the revised spec and the clarification provided by kai addressed your concerns.

For convenience, the changes made since your review can be tracked here: https://author-tools.ietf.org/iddiff?url1=draft-ietf-alto-new-transport-17&url2=draft-ietf-alto-new-transport-21&difftype=--html

Thank you

Med (Doc Shepherd)

> -----Message d'origine-----
> De : alto <[e-mail]> De la part de [e-mail]
> Envoyé : dimanche 29 octobre 2023 13:27
> À : Roman Danyliw <[e-mail]>
> Cc : The IESG <[e-mail]>; [e-mail]; draft-ietf-alto-
> [e-mail]; [e-mail]
> Objet : Re: [alto] Roman Danyliw's Discuss on draft-ietf-alto-new-
> transport-17: (with DISCUSS and COMMENT)
> 
> Hi Roman,
> 
> I hope you are OK with our responses to your DISCUSS points. This is
> the follow-up update regarding your comments.
> 
> First, for the comment on Digest authentication, we agree that this is
> a fair request as RFC 7285 says Digest authentication is mandatory. An
> example using Digest authentication is added in Sec 6.3.
> 
> For the comment on mandating RFC 9325, I am a bit hesitated to do so.
> First, this seems a bit repetitive as Section 15.1.2 in RFC 7285
> already says
> 
>   "Software engineers developing and service providers deploying ALTO
>    should make themselves familiar with possibly updated standards
>    documents as well as up-to-date Best Current Practices on
> configuring
>    HTTP over TLS."
> 
> Second, RFC 9325 seems to be applicable to any protocol building on
> top of TLS, not specific to ALTO. It is also applicable to any
> extension to ALTO. It feels a bit weird to add something that is
> broader than the scope of the extension specified in the document,
> especially when it does not require specific attentions to the TLS
> layer.
> 
> We could certainly add a sentence saying that developers of this
> extensions should follow RFC 9325 if you think this is really
> important. Otherwise we intend to not include the discussion on TLS.
> 
> Best,
> Kai
> 
> > -----Original Messages-----
> > From: [e-mail]
> > Send time:Wednesday, 10/25/2023 17:57:00
> > To: "Roman Danyliw" <[e-mail]>
> > Cc: "The IESG" <[e-mail]>, [e-mail],
> > [e-mail], [e-mail]
> > Subject: Re: [alto] Roman Danyliw's Discuss on
> > draft-ietf-alto-new-transport-17: (with DISCUSS and COMMENT)
> >
> > Hi Roman,
> >
> > Thanks for the review. Please see inline.
> >
> > Best,
> > Kai
> >
> >
> > > -----Original Messages-----
> > > From: "Roman Danyliw via Datatracker" <[e-mail]> Send
> > > time:Tuesday, 10/24/2023 10:40:46
> > > To: "The IESG" <[e-mail]>
> > > Cc: [e-mail], [e-mail],
> > > [e-mail]
> > > Subject: [alto] Roman Danyliw's Discuss on
> > > draft-ietf-alto-new-transport-17: (with DISCUSS and COMMENT)
> > >
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> > > draft-ietf-alto-new-transport-17: Discuss
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> > >
> > >
> > > ------------------------------------------------------------------
> --
> > > --
> > > DISCUSS:
> > > ------------------------------------------------------------------
> --
> > > --
> > >
> > > ** Section 6.2.  Construction of the "tips-view-uri".
> > >
> > > -- Under what circumstances would it be appropriate to use http
> > > (instead of
> > > https) for the tips-view-uri for this new protocol mechanism?  Why
> > > is http needed?  Could https be the only option?  I appreciate
> that
> > > there is history of an http URL from RFC7285 published in 2014,
> but
> > > has field experience continue to dictate a need for this insecure
> > > approach for an entirely new service?  If it is needed would there
> be a away to express a preference for secure transport?
> > >
> >
> > [KAI] One reason I can think of to keep http is to allow caching of
> > incremental updates (whose uri is based on the tips-view-uir) for a
> > given resource whose content is intended to be publicly accessible,
> > which could happen if the server is hosted by the ISP and a cost map
> > is intended to be accessible by all its users. How about we add the
> following sentence in sec 6.2:
> >
> >   An ALTO server SHOULD always use "https" unless the ALTO resource
> is intended to
> >   be publicly accessible and does not raise any security concerns.
> >
> > > -- Is there any underlying assumption in how "tips-view-path" is
> > > constructed? I asked because Section 9.3 says "An outside party
> that
> > > can read the TIPS response or that can observe TIPS requests can
> > > obtain the TIPS view URI and use that to send fraudulent 'DELETE'
> > > requests thus disabling the service for the valid ALTO client.
> This
> > > can be avoided by encrypting the requests and responses (Section
> 15
> > > of [RFC7285])."  Observing the tips-view-uri is one way to spoof
> the
> > > URI, but what if it could be guessed?  Is there an assumption that
> a
> > > unguessable random string is part of the path?  As far as I can
> > > find, no text explicitly says that, although the examples imply
> it.
> > > If the string is guessable being encrypted doesn't help but using
> some kind of authentication would.
> > >
> > >
> >
> > [KAI] In -17, the fraudulent 'DELETE' issue no long exists as we now
> > require the server to close of TIPS views, as suggested by the
> HTTPDIR
> > reviewer and the AD. I think that would address this issue.
> >
> > > ------------------------------------------------------------------
> --
> > > --
> > > COMMENT:
> > > ------------------------------------------------------------------
> --
> > > --
> > >
> > > Thank you to Donald Eastlake for the SECDIR review.
> > >
> > > ** Section 6.3.  The example in Figure 10 describes Basic Auth.
> > > Section 8.3.5 of RFC7295 notes that Digest Auth is MTI.  Recommend
> using that instead.
> > >
> > > ** Section 9.
> > >    The security considerations (Section 15 of [RFC7285]) of the
> base
> > >    protocol fully apply to this extension.  For example, the same
> > >    authenticity and integrity considerations (Section 15.1 of
> [RFC7285])
> > >    still fully apply;
> > >
> > > Since ALTO TIPS is a new protocol mechanism is it possible to
> > > improve on the TLS guidance in Section 8.3.5 of RFC7295 (from
> circa
> > > 2014)?  Specifically, can
> > > RFC9325 be mandated?
> > >
> > >
> > >
> > > _______________________________________________
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