Re: [secdir] Secdir review of draft-ietf-multi-cost
"Randriamasy, Sabine (Nokia - FR/Nozay)" <sabine.randriamasy@nokia-bell-labs.com> Mon, 27 March 2017 23:36 UTC
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From: "Randriamasy, Sabine (Nokia - FR/Nozay)" <sabine.randriamasy@nokia-bell-labs.com>
To: Magnus Nyström <magnusn@gmail.com>, "secdir@ietf.org" <secdir@ietf.org>, "draft-ietf-alto-multi-cost@ietf.org" <draft-ietf-alto-multi-cost@ietf.org>
Thread-Topic: Secdir review of draft-ietf-multi-cost
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Date: Mon, 27 Mar 2017 23:36:01 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdir/IeteBTg_rl9JNarNecvNAgjocZo>
Subject: Re: [secdir] Secdir review of draft-ietf-multi-cost
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Hello Magnus, Thank you very much for your review and feedback. To answer your questions: - we believe that this proposal does not cause any additional security issues compared to the base protocol specified in RFC7285. The Multi-Cost optimization even tends to reduce the on the wire data exchange volume compared to multiple single cost ALTO transactions. Likewise, the risk related to massive multi-cost request is moderated by the fact that Multi-Cost constraints further filters ALTO Server responses and thus their volume. - Indeed the formulation "legacy" needs be updated as you suggest. We will track similar examples and post a revision. Best regards, Sabine >>-----Original Message----- >>From: Magnus Nyström [mailto:magnusn@gmail.com] >>Sent: lundi 27 mars 2017 05:51 >>To: secdir@ietf.org; draft-ietf-alto-multi-cost@ietf.org >>Subject: Secdir review of draft-ietf-multi-cost >> >>I have reviewed this document as part of the security directorate's ongoing >>effort to review all IETF documents being processed by the IESG. These >>comments were written primarily for the benefit of the security area >>directors. Document editors and WG chairs should treat these comments just >>like any other last call comments. >> >>This document describes extensions to the ALTO (Application Layer Traffic >>Optimization) protocol that allows for more efficient information exchanges >>between an ALTO client and an ALTO server. >>Specifically, it allows a client to query for multiple metrics in one request. >> >>The security considerations section correctly refers to the basic ALTO >>protocol I only have one additional consideration (and I don't even know if it >>applies ...): With the existing ALTO protocol, a server could defend against >>dDOS by not throttling requests. However, each accepted request is simple >>in that it only deals with one metric. With this document, a malicious client >>could send a highly complicated query to the server, which may cause >>significant resources to be used on the server end and without an ability to >>throttle. Is that a risk? >> >>Other than that, the document may benefit from a language/grammar >>review. Example: >>"Hence a legacy may send a request with a constraint test on any of the cost >>types listed in "cost-type-name" - should likely be "legacy client". There are >>more such examples. >> >>Thanks, >>-- Magnus
- [secdir] Secdir review of draft-ietf-multi-cost Magnus Nyström
- Re: [secdir] Secdir review of draft-ietf-multi-co… Randriamasy, Sabine (Nokia - FR/Nozay)