Re: [Netconf] LC on subscribed-notifications-10
"Eric Voit (evoit)" <evoit@cisco.com> Wed, 14 March 2018 20:11 UTC
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From: "Eric Voit (evoit)" <evoit@cisco.com>
To: Andy Bierman <andy@yumaworks.com>, Martin Bjorklund <mbj@tail-f.com>
CC: "alex@clemm.org" <alex@clemm.org>, "Robert Wilton -X (rwilton - ENSOFT LIMITED at Cisco)" <rwilton@cisco.com>, "kwatsen@juniper.net" <kwatsen@juniper.net>, "netconf@ietf.org" <netconf@ietf.org>, "draft-ietf-netconf-subscribed-notifications@ietf.org" <draft-ietf-netconf-subscribed-notifications@ietf.org>
Thread-Topic: [Netconf] LC on subscribed-notifications-10
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Date: Wed, 14 Mar 2018 20:11:49 +0000
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Subject: Re: [Netconf] LC on subscribed-notifications-10
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Per below, updated text now at: https://github.com/netconf-wg/rfc5277bis/blob/master/draft-ietf-netconf-subscribed-notifications-11.txt Specifically: Section 2.1. Access control permissions may be used to silently exclude event records from within a stream for which the subscriber has no read access. As an example of how this might be accomplished, see [RFC6536bis] section 3.4.6. Note that per Section 2.7 of this document, subscription state change notifications are never filtered out. If no access control permissions are in place for stream content, then a receiver MUST be allowed access to all the event records on the stream. Also I modified the definition of: leaf excluded-notifications { type yang:counter64; config false; description "Operational data which provides the number of event records from a stream explicitly removed either via a stream filter or an access control filter so that they are not passed to a receiver."; } It is likely sufficient to have a single counter here. But if people would prefer independent counters for stream filter exclusions and access control exclusions, that can easily be included. Eric > -----Original Message----- > From: Eric Voit (evoit) > Sent: Wednesday, March 14, 2018 1:14 PM > To: 'Andy Bierman' <andy@yumaworks.com> > Cc: Martin Bjorklund <mbj@tail-f.com>; alex@clemm.org; Robert Wilton -X > (rwilton - ENSOFT LIMITED at Cisco) <rwilton@cisco.com>; > kwatsen@juniper.net; netconf@ietf.org; draft-ietf-netconf-subscribed- > notifications@ietf.org > Subject: RE: [Netconf] LC on subscribed-notifications-10 > > (Look for <Eric2> trying to keep things legible for those using text only email > clients) > > From: Andy Bierman, March 14, 2018 12:53 PM > > On Wed, Mar 14, 2018 at 8:35 AM, Eric Voit (evoit) <mailto:evoit@cisco.com> > wrote: > (reducing to the single open item, and adding Andy + Alex to the "to") > > > From: Martin Bjorklund, March 14, 2018 9:59 AM > > > > Hi, > > > > "Eric Voit (evoit)" <mailto:evoit@cisco.com> wrote: > > > Hi Martin, > > > > > > But for > > > subscription to event streams, it is assumed that any event records > > > placed on a stream permitted for that receiver is authorized content > > > (just like RFC-5277). > > > > Hmm. This is not how it is defined in RFC 5277: > > Agree. I should not have said "just like 5277". More below. > > > After generation of the <notification> element, access control is > > applied by the server. If a session does not have permission to > > receive the <notification>, then it is discarded for that session, > > and processing of the internal event is completed for that session. > > > > Also, NACM is designed to drop notifications that the client doesn't > > have access to. > > A few years ago during early discussions, Alex and I remember Andy asking that > per receiver access control not be applied to traffic coming out of a > stream. We took that to mean that a receiver should get all the event records > on a stream, without any per-notification filtering. This is what drove the > current text. > > Per RFC-6536, section 3.4.6., the outgoing <notification> authorization is able > to look at the notification event type, and if a receiver is authorized to receive > the notification event type, then it is also authorized to receive any data it > contains. > > Reconsidering this, perhaps Alex and I interpreted Andy's intent wrong. And > Andy actually requested the current event type behavior which NACM can > currently perform on the RFC-5277 NETCONF event stream, but no other > filtering of event records beyond that. > > I think the notification event type filtering is still applicable. > > <Eric2> Based on this, I will add the relevant RFC-5277 text into subscribed > notifications. Look for a link to a draft version on github shortly. Will send link > to this thread. > </Eric2> > > I remember some discussions about applying NACM to YANG Push > subscriptions. > Of course the client needs permission to receive <push-update> events. > The issue for YP is that this is the only access control provided. > > In order to support NACM for the contents of <push-update> events, the client > MUST have permission to read every data node specified in the filters for a > subscription. This is checked when the subscription is configured or activated. > If a filter-ref filter is changed so this is no longer true, then the server MUST > suspend or terminate the subscription. > > IMO even this is quite an implementation burden, but less than having the > server check NACM rules for every descendant node of every edited node for > every <push-update>. > > <Eric2> Agree that either is a valid method of achieving the requirements of > yang-push. > </Eric2> > > Eric2 > > If that is the case, and this capability is desired by the WG, Alex and I would be > happy to replicate the relevant text from RFC-5277 section 3.2 to draft-ietf- > netconf-subscribed-notifications to cover this. > > Thanks, > Eric > > Andy > > > > > Effects like this are why the two drafts, as well as the YANG model > > > targets and filters for datastores and to streams have been separated. > > > > > > > Your statement: > > > > > > > > Access control is to the stream rather than the content. > > > > > > > > seems to imply that in order to subscribe to changes to the > > > > datastore, you need full access to all nodes covered by the filter. > > > > > > As a stream and a datastore are different, hopefully my comment > > > above clears this up. > > > > > > Eric > > > > /martin > > > > > > /martin
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] subscribed-notifications-12 Eric Voit (evoit)
- Re: [Netconf] subscribed-notifications-12 Martin Bjorklund
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Xufeng Liu
- Re: [Netconf] LC on subscribed-notifications-10 Jeff Tantsura
- Re: [Netconf] LC on subscribed-notifications-10 Tim Jenkins (timjenki)
- Re: [Netconf] LC on subscribed-notifications-10 Igor Bryskin
- Re: [Netconf] LC on subscribed-notifications-10 Qin Wu
- Re: [Netconf] LC on subscribed-notifications-10 Tianran Zhou
- Re: [Netconf] LC on subscribed-notifications-10 JEFERSON CAMPOS NOBRE
- Re: [Netconf] LC on subscribed-notifications-10 Henk Birkholz
- Re: [Netconf] LC on subscribed-notifications-10 Robert Wilton
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Robert Wilton
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Martin Bjorklund
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Martin Bjorklund
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Andy Bierman
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Qin Wu
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 r… Balazs Lengyel
- Re: [Netconf] LC on subscribed-notifications-10 Rohit R Ranade
- Re: [Netconf] LC on subscribed-notifications-10 Alexander Clemm
- Re: [Netconf] [SPAM?] RE: LC on subscribed-notifi… alex
- Re: [Netconf] [SPAM?] RE: LC on subscribed-notifi… Rohit R Ranade
- Re: [Netconf] [SPAM?] RE: LC on subscribed-notifi… Juergen Schoenwaelder
- Re: [Netconf] [SPAM?] RE: LC on subscribed-notifi… Randy Presuhn
- Re: [Netconf] [SPAM?] RE: LC on subscribed-notifi… Sterne, Jason (Nokia - CA/Ottawa)
- Re: [Netconf] LC on subscribed-notifications-10 r… Eric Voit (evoit)
- Re: [Netconf] [SPAM?] RE: LC on subscribed-notifi… Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 r… Martin Bjorklund
- Re: [Netconf] LC on subscribed-notifications-10 r… Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Alexander Clemm
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- [Netconf] subscribed-notifications-12 t.petch
- Re: [Netconf] subscribed-notifications-12 Eric Voit (evoit)
- Re: [Netconf] subscribed-notifications-12 t.petch
- Re: [Netconf] subscribed-notifications-12 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)