Re: [secdir] Early secdir review of c-02 (draft-ietf-netconf-yang-push-00)
Benoit Claise <bclaise@cisco.com> Fri, 30 October 2015 05:33 UTC
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To: Takeshi Takahashi <takeshi_takahashi@nict.go.jp>, draft-ietf-netconf-yang-push.all@tools.ietf.org
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From: Benoit Claise <bclaise@cisco.com>
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Date: Fri, 30 Oct 2015 14:33:04 +0900
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Cc: NETCONF <netconf@ietf.org>, netconf-chairs@tools.ietf.org, secdir@ietf.org
Subject: Re: [secdir] Early secdir review of c-02 (draft-ietf-netconf-yang-push-00)
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Thanks Take, [bcc'ed the IESG, which was in the initial distribution] I would like this discussion to take place on the NETCONF mailing list, which I added. Note also that this draft is now a WG document: draft-ietf-netconf-yang-push Regards, Benoit > Hello, > > 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. > > [overall feeling on this draft] > > As an early review, this document is fine. > I believe the topic is very important. > > [overview] > > This draft deals with the push mechanism of the YANG datastore's updats. > The usability of push mechanism is obvious. > The draft elaborates parameters needed for the mechanism, including filters > and subscription-config. > > [questions] > > It was fun to read the article, though I am not that familiar with this > area. > > Here are several clarification questions. > I would appreciate if you could answer them to deepen my understanding. > > 1. > Let me assue that I send a create-subscription message with the period=500 > parameter. If the server can only send updates with period=1000, what will > happen? > Is the subscription declined? Or is the subscription accepted with > period=1000? > > If it is declined, how can I know the supported period value? > I guess the error response message does not explain the minimum value for > the period. > > 2. > I guess arbitrary value can be set for stop-time. > Then, the updates will be sent periodically for very long time, once the > subscription is accepted. > I am wondering if we need to check whether the subscriber is still alive > (whether the subscriber is still the authorized one). > Would you have any means to check the subscriber status ? (I guess no) > Or, do we need to specify stop-time that is not that far from now to avoid > any accident? > > I am not sure how sensitive the update information is, so it could be a > nonsense question... > > 3. > Are you going to use the IANA tables for the values, such as the "encoding" > field? > > 4. > Regarding the security consideration, I have got the impression that the > current text focuses on DDoS scenarios. > How about the false update? > Malicious entity may send false update to the subscriber. > The false update may let the subscriber mis-judge the situation and initiate > some operations. > Is it going to be a viable concern? > > > Thanks, and kind regards, > Take > > > > . >
- [secdir] Early secdir review of draft-clemm-netco… Takeshi Takahashi
- Re: [secdir] Early secdir review of c-02 (draft-i… Benoit Claise