Re: [netconf] Roman Danyliw's Discuss on draft-ietf-netconf-netconf-event-notifications-20: (with DISCUSS)

Roman Danyliw <rdd@cert.org> Wed, 15 May 2019 20:36 UTC

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From: Roman Danyliw <rdd@cert.org>
To: "Eric Voit (evoit)" <evoit@cisco.com>, The IESG <iesg@ietf.org>
CC: "draft-ietf-netconf-netconf-event-notifications@ietf.org" <draft-ietf-netconf-netconf-event-notifications@ietf.org>, Kent Watsen <kent+ietf@watsen.net>, "netconf-chairs@ietf.org" <netconf-chairs@ietf.org>, "netconf@ietf.org" <netconf@ietf.org>
Thread-Topic: Roman Danyliw's Discuss on draft-ietf-netconf-netconf-event-notifications-20: (with DISCUSS)
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Date: Wed, 15 May 2019 20:36:37 +0000
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Subject: Re: [netconf] Roman Danyliw's Discuss on draft-ietf-netconf-netconf-event-notifications-20: (with DISCUSS)
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> -----Original Message-----
> From: Eric Voit (evoit) [mailto:evoit@cisco.com]
> Sent: Wednesday, May 15, 2019 4:34 PM
> To: Roman Danyliw <rdd@cert.org>;; The IESG <iesg@ietf.org>;
> Cc: draft-ietf-netconf-netconf-event-notifications@ietf.org; Kent Watsen
> <kent+ietf@watsen.net>;; netconf-chairs@ietf.org; netconf@ietf.org
> Subject: RE: Roman Danyliw's Discuss on draft-ietf-netconf-netconf-event-
> notifications-20: (with DISCUSS)
> 
> Hi Roman,
> 
> Thanks for the review.   A thought in-line...
> 
> > From: Roman Danyliw, May 15, 2019 3:33 PM
> >
> > ----------------------------------------------------------------------
> > DISCUSS:
> > ----------------------------------------------------------------------
> >
> > An easy to fix issue.
> >
> > Section 8.  I agree with the brevity of this section as the more
> > detailed considerations can be found in [draft-ietf-netconf-subscribed-
> notifications].
> > [draft-ietf-netconf-subscribed-notifications] has a similar statement
> > about buggy subscribers, but also makes a SHOULD statement about
> > operators monitoring for odd behavior.  This text doesn’t include this
> > monitoring recommendation but does explicitly discuss terminating
> > sessions.  Could the text in these two sections please be reconciled.
> Perhaps with a reference such as:
> >
> > “This document does not introduce additional Security Considerations
> > for dynamic subscriptions beyond those discussed in
> > [draft-ietf-netconf-subscribed- notifications].  In particular for NETCONF
> subscribers …<use the current text> ”
> 
> I think what you are looking for is something like:
> "This document does not introduce additional Security Considerations for
> dynamic subscriptions beyond those discussed in [draft-ietf-netconf-
> subscribed-notifications].  But there is one consideration worthy of more
> refinement based on the connection oriented nature of the NETCONF
> protocol.  Specifically, if a buggy or compromised NETCONF subscriber sends
> a number of "establish-subscription" requests, then these subscriptions
> accumulate and may use up system resources. In such a situation,
> subscriptions MAY be terminated by terminating the underlying NETCONF
> session... "

Works for me (and better than what I proposed).  Thank you for this new text.

Roman