
From nobody Mon Jan  1 16:16:34 2018
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From: Melinda Shore <melinda.shore@gmail.com>
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Subject: [secdir] Secdir last call review of draft-ietf-pim-yang-12
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Reviewer: Melinda Shore
Review result: Ready

This document presents a YANG model for devices that implement protocol
independent multicast (PIM).  The bulk of this document contains data model
definitions for the base model and for PIM YANG models and is beyond the scope
of this review.

The security considerations section appears to be derived directly from
published YANG model RFCs and seems reasonable.  The nits checker picked up
some outdated references and two downrefs (Normative reference to an
Informational RFC: RFC 3569 and Normative reference to an Experimental RFC: RFC
3973) as well as several outdated references, and those will need to be fixed
prior to publication.

Overall, the document quality is good.


From nobody Thu Jan  4 06:20:21 2018
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Review instructions and related resources are at:
http://tools.ietf.org/area/sec/trac/wiki/SecDirReview

For telechat 2018-01-11

Reviewer               LC end     Draft
Shaun Cooley           2018-01-09 draft-ietf-netmod-rfc7223bis-01
Donald Eastlake        2018-01-10 draft-ietf-netmod-revised-datastores-09
Shawn Emery            2018-01-10 draft-ietf-netmod-entity-07
Daniel Franke          2018-01-02 draft-ietf-mpls-flow-ident-06
Daniel Gillmor         2017-12-29 draft-ietf-teas-network-assigned-upstream-label-11
Matthew Miller         2017-12-08 draft-atarius-dispatch-meid-urn-14
Sandra Murphy          2017-11-30 draft-ietf-httpbis-origin-frame-04
Stefan Santesson       2017-12-12 draft-ietf-rtgwg-yang-rip-07
Tina Tsou              2017-12-22 draft-ietf-bess-evpn-overlay-10
Tom Yu                 2017-12-28 draft-ietf-pce-pcep-exp-codepoints-04
Tom Yu                 2017-12-22 draft-ietf-slim-negotiating-human-language-19
Dacheng Zhang          2018-01-09 draft-ietf-netmod-rfc7277bis-01

For telechat 2018-01-25

Reviewer               LC end     Draft
Tim Polk               2018-01-16 draft-ietf-lwig-energy-efficient-08
Vincent Roca           2018-01-16 draft-ietf-intarea-broadcast-consider-05
Kyle Rose              2018-01-24 draft-ietf-dhc-rfc3315bis-10
Sean Turner            2018-01-16 draft-ietf-ospf-link-overload-11
Carl Wallace           2018-01-15 draft-ietf-netmod-rfc8022bis-07
Brian Weis             2018-01-16 draft-ietf-nfsv4-flex-files-15
Paul Wouters           2018-01-16 draft-ietf-lpwan-overview-07
Paul Wouters           2018-01-11 draft-ietf-ospf-ospfv3-lsa-extend-20
Liang Xia              2018-01-10 draft-ietf-pim-source-discovery-bsr-07

Last calls:

Reviewer               LC end     Draft
John Bradley           None       draft-ietf-acme-acme-09
Shaun Cooley           2018-01-11 draft-ietf-grow-bgp-gshut-13
Russ Mundy             2017-09-14 draft-spinosa-urn-lex-12
Tina Tsou             R2017-06-29 draft-ietf-trill-arp-optimization-09

Early review requests:

Reviewer               Due        Draft
Ólafur Guðmundsson     2018-01-09 draft-ietf-opsawg-nat-yang-09

Next in the reviewer rotation:

  Liang Xia
  Tom Yu
  Dacheng Zhang
  Derek Atkins
  John Bradley
  Shaun Cooley
  Alan DeKok
  Donald Eastlake
  Shawn Emery
  Stephen Farrell


From nobody Thu Jan  4 17:44:47 2018
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Reviewer: Sean Turner
Review result: Ready

In reviewing this draft, I was most concerned that this mechanism could be used
by an attacker to push traffic towards or away from a node.  If the messages
are authenticated then I tend to agree with your assessment that this draft
doesn't introduce any new security considerations beyond those in
[RFC2328]/[RFC5340].  If not, well all bets are off.

I did note a couple of editorial nits, but I sent those directly to the authors.


From nobody Fri Jan  5 05:26:14 2018
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Hello,

I have reviewed this document as part of the security directorate=E2=80=99=
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.

Summary: Ready with issues

This document lists recommendations concerning the use of
broadcast/multicast traffic from a privacy point of view, which is
highly valuable. However I have a certain number of comments.
(sorry if my email is a bit long=E2=80=A6)


Main comments:

1) First of all, the focus of this document looks ambiguous.
The title refers to "IP broadcast and multicast protocol designers"
which I can understand as those low level protocols for IP broadcast
and multicast (e.g., IGMP, MLD, and why not various multicast routing
protocols, etc.). On the opposite, the abstract restricts the focus:
"application-layer protocols make use of IP broadcasts or multicast
messages" (1st sentence). Then, when reading the document, I sometimes
understand that it could also consider lower layer protocols. This
should be clarified.

Also, instead of "designers of broadcast/multicast protocols" I'd
rather say "designers of protocols relying (in parts or totally) on
broadcast/multicast traffic". This applies to the title (in a
condensed version) and throughout the core of the document.


2) Another point: I'd like to see the item (b) of introduction
developed as this is the key issue with multicast/broadcast traffic.
Without encryption, application messages are vulnerable to
eavesdropping and all kinds of analyses. A group key could be
negociated and used for encrypting this traffic, but this requires a
more complex setup mechanism (typically a key management system,
probably with re-keying and all the stuff) and requires a preliminary
association of a terminal that is not necessarily compatible with the
application-layer protocol features.
The text could say that if possible, multicast/broadcast traffic
encryption should be used, otherwise risks should be minimised as
discussed in this document. And of course, it's always good to remind
the designers that unicast traffic should be always encrypted since
there's no good reason not to do that.


3) I'd like to suggest another recommendation: when applicable, limit
or avoid user-originated broadcast/multicast messages, preferring
infrastructure originated messages.
An example: in a discovery mechanism, avoid terminal sollicitation as
much as possible and limit oneself to infrastructure announcement
broadcast messages, even if it can include some extra delay (controled
with the announcement frequency). This is exactly what happened in
Wifi AP discovery, where the passive discovery scheme, AP based, is
now prefered to the active scheme.
Said differently, multicast/broadcast is not per se the issue, when
originating from the infrastructure it is generaly safe.


4) A more general comment, related to item (a) of intro:
Broadcast/multicast can simplify user surveillance, I agree. However,
when I'm looking at all the practicies of companies working in the
advertising area (in particular A&A companies, sitting between
smartphone users and advertisers, domain that I know a little bit),
the techniques deployed are incredibly smart, some of them bypassing
technical protections set up by the OS manufacturers, others relying
on hidden technical features. It's impressive how inventive those
companies can be.
My point is that even if traffic is 100% unicast, as long as a
wireless medium is used, anyone wanting to monitor users in order to
profile them will set up the required hardware/software configuration.
This is trivial and extremely cheap nowadays (except perhaps for 4G
connections), and most of the time this is a purely passive
monitoring. The unicast/multicast/broadcast nature of traffic has no
importance as long as you are within wireless network range.


Clarification needed:

** section 4: I cannot understand the meaning of "information" in:
        "* You SHOULD try to design the protocol in a way that the
         information cannot be correlated with other information in
         broadcast/multicast messages"
What does the first instance of "information" refer to?


** Last but one sentence of section 2.2: Why do you say "or at least
much more difficult"? Without encryption, a persistant application
layer identifier voids any lower layer attempt. I'd remove this
comment altogether.


Various:

** the authors use the term "host name" to refer to a higher layer
name of a device. To me this term refers to the DNS notion of
"hostname", i.e. something different, hence confusion. I'd recommend
to use "device name" in order to avoid it.

** section 2.3: instead of:
        "If only a persistent ID is needed, this can be generated
        randomly. =C2=BB
I'd rather say:
        "Persistent identifiers SHOULD be avoided (section 2.2), but
        if one is absolutely needed and if the devide name is not
        required, then the identifier SHOULD be generated randomly."


Typos:

** section 4: s/broad-/broadcast/ in:
        "because of the special nature of broad- and multicast."

** section 5: "are" is missing in:
        ...for another class of attacks that not related to privacy."


Regards,

  Vincent=

--Apple-Mail=_D6A7D508-0DB2-4665-A1BC-9FEE4D090177
Content-Transfer-Encoding: quoted-printable
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<html><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space;" class=3D""><div =
class=3D"">Hello,<br class=3D""><br class=3D"">I have reviewed this =
document as part of the security directorate=E2=80=99s ongoing<br =
class=3D"">effort to review all IETF documents being processed by the =
IESG. These<br class=3D"">comments were written primarily for the =
benefit of the security area<br class=3D"">directors. &nbsp;Document =
editors and WG chairs should treat these comments just<br class=3D"">like =
any other last call comments.<br class=3D""><br class=3D"">Summary: <b =
class=3D"">Ready with issues</b></div><div class=3D""><br =
class=3D""></div><div class=3D"">This document lists recommendations =
concerning the use of</div><div class=3D"">broadcast/multicast traffic =
from a privacy point of view, which is</div><div class=3D"">highly =
valuable. However I have a certain number of comments.</div><div =
class=3D"">(sorry if my email is a bit long=E2=80=A6)</div><div =
class=3D""><br class=3D""></div><div class=3D""><br class=3D""></div><div =
class=3D""><b class=3D"">Main comments:</b></div><div class=3D""><br =
class=3D""></div><div class=3D"">1) First of all, the focus of this =
document looks ambiguous.</div><div class=3D"">The title refers to "IP =
broadcast and multicast protocol designers"</div><div class=3D"">which I =
can understand as those low level protocols for IP broadcast</div><div =
class=3D"">and multicast (e.g., IGMP, MLD, and why not various multicast =
routing</div><div class=3D"">protocols, etc.). On the opposite, the =
abstract restricts the focus:</div><div class=3D"">"application-layer =
protocols make use of IP broadcasts or multicast</div><div =
class=3D"">messages" (1st sentence). Then, when reading the document, I =
sometimes</div><div class=3D"">understand that it could also consider =
lower layer protocols. This</div><div class=3D"">should be =
clarified.</div><div class=3D""><br class=3D""></div><div class=3D"">Also,=
 instead of "designers of broadcast/multicast protocols" I'd</div><div =
class=3D"">rather say "designers of protocols relying (in parts or =
totally) on</div><div class=3D"">broadcast/multicast traffic". This =
applies to the title (in a</div><div class=3D"">condensed version) and =
throughout the core of the document.</div><div class=3D""><br =
class=3D""></div><div class=3D""><br class=3D""></div><div class=3D"">2) =
Another point: I'd like to see the item (b) of introduction</div><div =
class=3D"">developed as this is the key issue with multicast/broadcast =
traffic.</div><div class=3D"">Without encryption, application messages =
are vulnerable to</div><div class=3D"">eavesdropping and all kinds of =
analyses. A group key could be</div><div class=3D"">negociated and used =
for encrypting this traffic, but this requires a</div><div class=3D"">more=
 complex setup mechanism (typically a key management system,</div><div =
class=3D"">probably with re-keying and all the stuff) and requires a =
preliminary</div><div class=3D"">association of a terminal that is not =
necessarily compatible with the</div><div class=3D"">application-layer =
protocol features.</div><div class=3D"">The text could say that if =
possible, multicast/broadcast traffic</div><div class=3D"">encryption =
should be used, otherwise risks should be minimised as</div><div =
class=3D"">discussed in this document. And of course, it's always good =
to remind</div><div class=3D"">the designers that unicast traffic should =
be always encrypted since</div><div class=3D"">there's no good reason =
not to do that.</div><div class=3D""><br class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D"">3) I'd like to suggest =
another recommendation: when applicable, limit</div><div class=3D"">or =
avoid user-originated broadcast/multicast messages, preferring</div><div =
class=3D"">infrastructure originated messages.</div><div class=3D"">An =
example: in a discovery mechanism, avoid terminal sollicitation =
as</div><div class=3D"">much as possible and limit oneself to =
infrastructure announcement</div><div class=3D"">broadcast messages, =
even if it can include some extra delay (controled</div><div =
class=3D"">with the announcement frequency). This is exactly what =
happened in</div><div class=3D"">Wifi AP discovery, where the passive =
discovery scheme, AP based, is</div><div class=3D"">now prefered to the =
active scheme.</div><div class=3D"">Said differently, =
multicast/broadcast is not per se the issue, when</div><div =
class=3D""><div class=3D"">originating from the infrastructure it is =
generaly safe.</div><div class=3D""><br class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D"">4) A more general =
comment, related to item (a) of intro:</div><div =
class=3D"">Broadcast/multicast can simplify user surveillance, I agree. =
However,</div><div class=3D"">when I'm looking at all the practicies of =
companies working in the</div><div class=3D"">advertising area (in =
particular A&amp;A companies, sitting between</div><div =
class=3D"">smartphone users and advertisers, domain that I know a little =
bit),</div><div class=3D"">the techniques deployed are incredibly smart, =
some of them bypassing</div><div class=3D"">technical protections set up =
by the OS manufacturers, others relying</div><div class=3D"">on hidden =
technical features. It's impressive how inventive those</div><div =
class=3D"">companies can be.</div><div class=3D"">My point is that even =
if traffic is 100% unicast, as long as a</div><div class=3D"">wireless =
medium is used, anyone wanting to monitor users in order to</div><div =
class=3D"">profile them will set up the required hardware/software =
configuration.</div><div class=3D"">This is trivial and extremely cheap =
nowadays (except perhaps for 4G</div><div class=3D"">connections), and =
most of the time this is a purely passive</div><div class=3D"">monitoring.=
 The unicast/multicast/broadcast nature of traffic has no</div><div =
class=3D"">importance as long as you are within wireless network =
range.</div><div class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""></div><div class=3D""><b class=3D"">Clarification =
needed:</b></div><div class=3D""><br class=3D""></div><div class=3D"">** =
section 4: I cannot understand the meaning of "information" =
in:</div><div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; "* You SHOULD try =
to design the protocol in a way that the</div><div class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;information cannot be correlated with other =
information in</div><div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;broadcast/multicast messages"</div><div class=3D"">What does the =
first instance of "information" refer to?</div><div class=3D""><br =
class=3D""></div><div class=3D""><br class=3D""></div><div class=3D"">** =
Last but one sentence of section 2.2: Why do you say "or at =
least</div><div class=3D"">much more difficult"? Without encryption, a =
persistant application</div><div class=3D"">layer identifier voids any =
lower layer attempt. I'd remove this</div><div class=3D"">comment =
altogether.</div><div class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""></div><div class=3D""><b class=3D"">Various:</b></div><div =
class=3D""><br class=3D""></div><div class=3D"">** the authors use the =
term "host name" to refer to a higher layer</div><div class=3D"">name of =
a device. To me this term refers to the DNS notion of</div><div =
class=3D"">"hostname", i.e. something different, hence confusion. I'd =
recommend</div><div class=3D"">to use "device name" in order to avoid =
it.</div><div class=3D""><br class=3D""></div><div class=3D"">** section =
2.3: instead of:</div><div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; "If =
only a persistent ID is needed, this can be generated</div><div =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; randomly.&nbsp;=C2=BB</div></div><d=
iv class=3D""><div class=3D"">I'd rather say:</div><div class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; "Persistent identifiers SHOULD be avoided (section =
2.2), but</div><div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; if one is =
absolutely needed and if the devide name is not</div><div =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; required, then the identifier =
SHOULD be generated randomly."</div><div class=3D""><br =
class=3D""></div><div class=3D""><br class=3D""></div><div class=3D""><b =
class=3D"">Typos:</b></div><div class=3D""><br class=3D""></div><div =
class=3D"">** section 4: s/broad-/broadcast/ in:</div><div =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; "because of the special nature of =
broad- and multicast."</div><div class=3D""><br class=3D""></div><div =
class=3D"">** section 5: "are" is missing in:</div><div class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; ...for another class of attacks that not related to =
privacy."</div></div><br class=3D""><br class=3D""><div class=3D"">
<div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;" class=3D""><div style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div style=3D"color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;">Regards,</div><div =
style=3D"color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;"><br class=3D""></div><div style=3D"color:=
 rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: =
0px;">&nbsp; Vincent</div></div></div></div></body></html>=

--Apple-Mail=_D6A7D508-0DB2-4665-A1BC-9FEE4D090177--


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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Sun, 7 Jan 2018 22:52:18 -0500
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Subject: [secdir] SECDIR review of draft-ietf-netmod-revised-datastores-09
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I have reviewed this document as part of the security directorate's
ongoing effort to review all IETF documents being processed by the
IESG.  Document editors and WG chairs should treat these comments just
like any other last call comments.

The summary of the review is Ready.

This draft specifies an elaborated datastore model for YANG based on
experience with the original model in RFC 6241. It is probably
correct, as stated in the Security Considerations, that this model
itself has no security effect.

The Security Considerations refer to the "YANG security module
security guidelines" by that quoted string only. I would assume these
guidelines are in a document somewhere and it would be nice to give a
pointer to that document.

Section 5.1, Page 11, third line up from the 5.1.1 heading, should the
reference to "Section 5" be a reference to "Figure 2"?

Thanks,
Donald
===============================
 Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
 155 Beaver Street, Milford, MA 01757 USA
 d3e3e3@gmail.com


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From: Donald Eastlake <d3e3e3@gmail.com>
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--001a113d56e6b738d005623bd13c
Content-Type: text/plain; charset="UTF-8"

Resent with to address fixed.

Thanks,
Donald
===============================
 Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
 155 Beaver Street, Milford, MA 01757 USA
 d3e3e3@gmail.com

On Sun, Jan 7, 2018 at 10:52 PM, Donald Eastlake <d3e3e3@gmail.com> wrote:

> I have reviewed this document as part of the security directorate's
> ongoing effort to review all IETF documents being processed by the
> IESG.  Document editors and WG chairs should treat these comments just
> like any other last call comments.
>
> The summary of the review is Ready.
>
> This draft specifies an elaborated datastore model for YANG based on
> experience with the original model in RFC 6241. It is probably
> correct, as stated in the Security Considerations, that this model
> itself has no security effect.
>
> The Security Considerations refer to the "YANG security module
> security guidelines" by that quoted string only. I would assume these
> guidelines are in a document somewhere and it would be nice to give a
> pointer to that document.
>
> Section 5.1, Page 11, third line up from the 5.1.1 heading, should the
> reference to "Section 5" be a reference to "Figure 2"?
>
> Thanks,
> Donald
> ===============================
>  Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
>  155 Beaver Street, Milford, MA 01757 USA
>  d3e3e3@gmail.com
>

--001a113d56e6b738d005623bd13c
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Resent with to address fixed.<div><br></div><div class=3D"=
gmail_extra"><div><div class=3D"gmail_signature" data-smartmail=3D"gmail_si=
gnature">Thanks,<br>Donald<br>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>=C2=A0Donald E. Eastlak=
e 3rd =C2=A0 +1-508-333-2270 (cell)<br>=C2=A0155 Beaver Street, Milford, MA=
 01757 USA<br>=C2=A0<a href=3D"mailto:d3e3e3@gmail.com" target=3D"_blank">d=
3e3e3@gmail.com</a></div></div>
<br><div class=3D"gmail_quote">On Sun, Jan 7, 2018 at 10:52 PM, Donald East=
lake <span dir=3D"ltr">&lt;<a href=3D"mailto:d3e3e3@gmail.com" target=3D"_b=
lank">d3e3e3@gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_=
quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1=
ex">I have reviewed this document as part of the security directorate&#39;s=
<br>
ongoing effort to review all IETF documents being processed by the<br>
IESG.=C2=A0 Document editors and WG chairs should treat these comments just=
<br>
like any other last call comments.<br>
<br>
The summary of the review is Ready.<br>
<br>
This draft specifies an elaborated datastore model for YANG based on<br>
experience with the original model in RFC 6241. It is probably<br>
correct, as stated in the Security Considerations, that this model<br>
itself has no security effect.<br>
<br>
The Security Considerations refer to the &quot;YANG security module<br>
security guidelines&quot; by that quoted string only. I would assume these<=
br>
guidelines are in a document somewhere and it would be nice to give a<br>
pointer to that document.<br>
<br>
Section 5.1, Page 11, third line up from the 5.1.1 heading, should the<br>
reference to &quot;Section 5&quot; be a reference to &quot;Figure 2&quot;?<=
br>
<br>
Thanks,<br>
Donald<br>
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D<wbr>=3D<br>
=C2=A0Donald E. Eastlake 3rd=C2=A0 =C2=A0+1-508-333-2270 (cell)<br>
=C2=A0155 Beaver Street, Milford, MA 01757 USA<br>
=C2=A0<a href=3D"mailto:d3e3e3@gmail.com">d3e3e3@gmail.com</a><br>
</blockquote></div><br></div></div>

--001a113d56e6b738d005623bd13c--


From nobody Sun Jan  7 22:22:37 2018
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From: Liang Xia <frank.xialiang@huawei.com>
To: <secdir@ietf.org>
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Subject: [secdir] Secdir last call review of draft-ietf-pim-source-discovery-bsr-07
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Reviewer: Liang Xia
Review result: Has Issues

Nits:
1. In Abstract, the abbreviation is missed when the Term are firstly appeared,
such as: Sparse-Mode, Rendezvous Point; 2. Every word in the section titles
should be in the capital form

Issues:
1. In Security Considerations section,  should one sentence be "even if the
sources are actually not active"? 2. Generally, the peer authentication (by
certificate, shared key...) and the message integration protection are always
helpful to defend against the forged routers and PEM messages, even the
resulted resource consumption. But in current Security Considerations section,
there is nothing discussed about these countermeasures, even in the general
way. Suggest to consider this point personally.


From nobody Mon Jan  8 13:44:44 2018
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From: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
Date: Mon, 8 Jan 2018 16:43:59 -0500
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Subject: [secdir] YANG Reviews
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Hello,

We will be seeing many YANG module reviews come through, please don't
let page counts scare you on these.  One of the main things to look
for is that they used the Security Considerations template and filled
it out, catching any data nodes that need to be enumerated in the
considerations.

Templates like this tend to get updated every time there's a new
SecAD, :-) . As such, it'll likely be updated again in a few months.
Here's the draft with the current template.  Have a look so you know
key things to look for (transport security is called out and
subtrees/data nodes of concern should be listed out).  Sometimes more
is needed specific to the draft, but often times, this covers it.

https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-10#page-52

Thanks again for all your reviews, it is a tremendous help to us!

-- 

Best regards,
Kathleen


From nobody Tue Jan  9 10:46:45 2018
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From: Russ Housley <housley@vigilsec.com>
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For MIB modules, we came up with a short list of things or the SecDir =
Reviewer to do.  This is a quote from an email message in 2007:

> The job of the security reviewers, then, is three-fold: first, to
> verify the existence of the boilerplate; second, to verify the =
adequacy
> of the explanations given for particular items; third -- and this is
> the hardest -- to scan the document to see if other items should have
> been identified as sensitive but aren't.

The real guidance appears here: =
http://www.ops.ietf.org/mib-security.html

It would be very helpful if we can come up with an equivalent =
yang-security.html document.

Russ


> On Jan 8, 2018, at 4:43 PM, Kathleen Moriarty =
<kathleen.moriarty.ietf@gmail.com> wrote:
>=20
> Hello,
>=20
> We will be seeing many YANG module reviews come through, please don't
> let page counts scare you on these.  One of the main things to look
> for is that they used the Security Considerations template and filled
> it out, catching any data nodes that need to be enumerated in the
> considerations.
>=20
> Templates like this tend to get updated every time there's a new
> SecAD, :-) . As such, it'll likely be updated again in a few months.
> Here's the draft with the current template.  Have a look so you know
> key things to look for (transport security is called out and
> subtrees/data nodes of concern should be listed out).  Sometimes more
> is needed specific to the draft, but often times, this covers it.
>=20
> https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-10#page-52
>=20
> Thanks again for all your reviews, it is a tremendous help to us!
>=20
> --=20
>=20
> Best regards,
> Kathleen


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To: Russ Housley <housley@vigilsec.com>
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Hi Russ,

Sent from my mobile device

> On Jan 9, 2018, at 1:46 PM, Russ Housley <housley@vigilsec.com> wrote:
>=20
> For MIB modules, we came up with a short list of things or the SecDir Revi=
ewer to do.  This is a quote from an email message in 2007:
>=20
>> The job of the security reviewers, then, is three-fold: first, to
>> verify the existence of the boilerplate; second, to verify the adequacy
>> of the explanations given for particular items; third -- and this is
>> the hardest -- to scan the document to see if other items should have
>> been identified as sensitive but aren't.

The guidance is very similar.
>=20
> The real guidance appears here: http://www.ops.ietf.org/mib-security.html
>=20
> It would be very helpful if we can come up with an equivalent yang-securit=
y.html document.
>=20
We can work with Benoit &Warren as it=E2=80=99s better for those writing the=
 drafts to see it first, so I think the home should be the same.

Best,
Kathleen=20

> Russ
>=20
>=20
>> On Jan 8, 2018, at 4:43 PM, Kathleen Moriarty <kathleen.moriarty.ietf@gma=
il.com> wrote:
>>=20
>> Hello,
>>=20
>> We will be seeing many YANG module reviews come through, please don't
>> let page counts scare you on these.  One of the main things to look
>> for is that they used the Security Considerations template and filled
>> it out, catching any data nodes that need to be enumerated in the
>> considerations.
>>=20
>> Templates like this tend to get updated every time there's a new
>> SecAD, :-) . As such, it'll likely be updated again in a few months.
>> Here's the draft with the current template.  Have a look so you know
>> key things to look for (transport security is called out and
>> subtrees/data nodes of concern should be listed out).  Sometimes more
>> is needed specific to the draft, but often times, this covers it.
>>=20
>> https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-10#page-52
>>=20
>> Thanks again for all your reviews, it is a tremendous help to us!
>>=20
>> --=20
>>=20
>> Best regards,
>> Kathleen
>=20


From nobody Tue Jan  9 22:48:08 2018
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From: Shawn Emery <shawn.emery@gmail.com>
Date: Tue, 9 Jan 2018 23:48:03 -0700
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--089e08259c40c1a6550562666926
Content-Type: text/plain; charset="UTF-8"

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 draft specifies a YANG data model for server hardware configuration
and status information.

The security considerations section does exist and follows the mib-security
template.  With this, the section defines the nodes that have sensitive
information.  Access controls are provided by the network management
protocol.  I agree with the provided set of nodes considered sensitive,
which covers the majority of them.  The section also states that there is a
MTI for secure transport of the underlying network management protocols
with SSH or TLS.  I believe that the section sufficiently covers the
various security concerns of the draft.

General comments:

None.

Editorial comments:

None.

Shawn.
--

--089e08259c40c1a6550562666926
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><span style=3D"font-size:12.8px">I have reviewed this docu=
ment as part of the security directorate&#39;s</span><br style=3D"font-size=
:12.8px"><span style=3D"font-size:12.8px">ongoing effort to review all=C2=
=A0<span class=3D"gmail-m_-8618428600954061146gmail-m_7708740057377588207m_=
-5546242983760954135gmail-m_4457086233820409101gmail-m_4728537460569717949m=
_1367315294398481242gmail-il">IETF</span>=C2=A0documents being processed by=
 the IESG.</span><br style=3D"font-size:12.8px"><span style=3D"font-size:12=
.8px">These comments were written primarily for the benefit of the security=
</span><br style=3D"font-size:12.8px"><span style=3D"font-size:12.8px">area=
 directors. Document editors and WG chairs should treat these</span><br sty=
le=3D"font-size:12.8px"><span style=3D"font-size:12.8px">comments just like=
 any other last call comments.</span><br><div><span style=3D"font-size:12.8=
px"><br></span></div><div><div style=3D"font-size:12.8px">This draft specif=
ies a YANG data model for server hardware configuration and status informat=
ion.</div><div style=3D"font-size:12.8px"><br></div><div style=3D"font-size=
:12.8px">The security considerations section does exist and follows the mib=
-security template.=C2=A0 With this, the section=C2=A0<span style=3D"font-s=
ize:12.8px">defines=C2=A0</span><span style=3D"font-size:12.8px">the nodes =
that have sensitive information</span><span style=3D"font-size:12.8px">.=C2=
=A0=C2=A0</span><span style=3D"font-size:12.8px">Access controls are provid=
ed by the network management protocol.=C2=A0=C2=A0</span><span style=3D"fon=
t-size:12.8px">I agree with the provided set of nodes considered sensitive,=
 which covers the majority of them.=C2=A0=C2=A0</span><span style=3D"font-s=
ize:12.8px">T</span><span style=3D"font-size:12.8px">he section also states=
 that there is a MTI for secure transport of the underlying network managem=
ent protocols with SSH or TLS.=C2=A0 I believe that the section sufficientl=
y covers the various security concerns of the draft.</span></div><div style=
=3D"font-size:12.8px"><br></div><div style=3D"font-size:12.8px">General com=
ments:</div><div style=3D"font-size:12.8px"><br></div><div style=3D"font-si=
ze:12.8px">None.</div><div style=3D"font-size:12.8px"><br></div><div style=
=3D"font-size:12.8px">Editorial comments:</div><div style=3D"font-size:12.8=
px"><span style=3D"color:rgb(0,0,0);font-size:13.3333px"><br></span></div><=
div><font color=3D"#000000"><span style=3D"font-size:13.3333px">None.</span=
></font></div></div><div><font color=3D"#000000"><span style=3D"font-size:1=
3.3333px"><br></span></font></div><div><span style=3D"color:rgb(0,0,0);font=
-size:13.3333px">Shawn.</span></div><div><span style=3D"color:rgb(0,0,0);fo=
nt-size:13.3333px">--</span></div></div>

--089e08259c40c1a6550562666926--


From nobody Wed Jan 10 13:37:02 2018
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From: Daniel Franke <dafranke@akamai.com>
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Cc: draft-ietf-mpls-flow-ident.all@ietf.org, ietf@ietf.org, mpls@ietf.org
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Subject: [secdir] Secdir last call review of draft-ietf-mpls-flow-ident-06
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Reviewer: Daniel Franke
Review result: Has Nits

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.

I know next to nothing about MPLS. The proposed functionality seems reasonable
and persuasively justified, but it is possible that there are significant
issues I'm overlooking. I have a couple nitpicks about the Security
Considerations section.

The lowercased (i.e., non-RFC-2119) "must"s and "should"s are weasel words when
not connected with a statement of what objective is achieved by following those
recommendations. For example, the sentence "Propagation of identification
information outside the MPLS network imposing it must be disabled by default"
ought to be prefaced or suffixed with something along the lines of "In order to
preserve present assumptions about MPLS privacy properties".

I see a lot of discussion about confidentiality concerns when flow information
is propagated across trust boundaries, but no discussion about the dual
integrity concerns. I suggest including some word of warning that flow
information received from an untrusted LSR cannot be assumed correct, so
caution is advised before relying on it, e.g., to determine for billing
purposes whether SLAs are being met.


From nobody Wed Jan 10 19:27:09 2018
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From: Taylor Yu <tlyu@mit.edu>
To: iesg@ietf.org, secdir@ietf.org, draft-ietf-slim-negotiating-human-language.all@ietf.org
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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.

Summary: ready with minor issues

The security considerations section seems mostly reasonable.  The
emergency services use case vaguely bothered me in ways I couldn't quite
articulate at first, but I think Alissa Cooper's ballot comment about
denying emergency services by manipulating these attributes captures
most of the essence.

I would add for that these new language tags, integrity seems to be a
stronger requirement than confidentiality, at least in the emergency
calling use case.

Best regards,
-Taylor


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From: Taylor Yu <tlyu@mit.edu>
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Subject: [secdir] secdir review of draft-ietf-pce-pcep-exp-codepoints-04
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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.

Summary: ready

The security considerations section seems reasonable.  The warning about
receiving conflicting experimental codepoints from another system seems
a little out of place if this were a protocol exposed to the Internet at
large.  (An implementation should in general handle all unexpected
inputs, accidental or malicious, in a way to avoid harmful
consequences.)  On the other hand, like many routing-related protocols,
PCEP doesn't seem to have very strong integrity or authentication
properties and instead relies on filtering, physical measures, or lower
layers such as TCP-AO.

Best regards,
-Taylor


From nobody Thu Jan 11 07:10:52 2018
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To: Taylor Yu <tlyu@mit.edu>, iesg@ietf.org, secdir@ietf.org, draft-ietf-slim-negotiating-human-language.all@ietf.org
From: Randall Gellens <rg+ietf@randy.pensive.org>
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Subject: Re: [secdir] secdir review of draft-ietf-slim-negotiating-human-language-22
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At 3:26 AM +0000 1/11/18, Taylor Yu wrote:

>  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.
>
>  Summary: ready with minor issues
>
>  The security considerations section seems mostly reasonable.  The
>  emergency services use case vaguely bothered me in ways I couldn't quite
>  articulate at first, but I think Alissa Cooper's ballot comment about
>  denying emergency services by manipulating these attributes captures
>  most of the essence.
>
>  I would add for that these new language tags, integrity seems to be a
>  stronger requirement than confidentiality, at least in the emergency
>  calling use case.

Hi Taylor,

Thanks for your review.  In response to Alissa's comments, I reworded 
the Security Considerations section to read:

    The Security Considerations of BCP 47 [RFC5646] apply here.  An
    attacker with the ability to modify signaling could prevent a call
    from succeeding by altering any of several crucial elements,
    including the 'hlang-send' or 'hlang-recv' values.  RFC 5069
    [RFC5069] discusses such threats.  Use of TLS or IPSec can protect
    against such threats.  Emergency calls are of particular concern; RFC
    6881 [RFC6881], which is specific to emergency calls, mandates use of
    TLS or IPSec (in ED-57/SP-30).

I think this also addresses your concern regarding integrity, as it 
specifically calls out "modification" as a principal threat.

--Randall



-- 
Randall Gellens
Opinions are personal;    facts are suspect;    I speak for myself only
-------------- Randomly selected tag: ---------------
Substitute "damn" every time you're inclined to write "very"; your
editor will delete it and the writing will be just as it should be.
              --William Allen White (famed Kansas newspaper editor)


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From: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
Date: Thu, 11 Jan 2018 11:21:25 -0500
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Subject: Re: [secdir] YANG Reviews
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Hello,

As it turns out, there is a page:

https://www.ietf.org/iesg/directorate/yang-doctors.html

If anyone has comments on the bis draft with current security
considerations template, please provide them to the WG.  Here is the
link again for your convenience:
https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-10#page-52

Thank you!

On Tue, Jan 9, 2018 at 2:15 PM, Kathleen Moriarty
<kathleen.moriarty.ietf@gmail.com> wrote:
> Hi Russ,
>
> Sent from my mobile device
>
>> On Jan 9, 2018, at 1:46 PM, Russ Housley <housley@vigilsec.com> wrote:
>>
>> For MIB modules, we came up with a short list of things or the SecDir Re=
viewer to do.  This is a quote from an email message in 2007:
>>
>>> The job of the security reviewers, then, is three-fold: first, to
>>> verify the existence of the boilerplate; second, to verify the adequacy
>>> of the explanations given for particular items; third -- and this is
>>> the hardest -- to scan the document to see if other items should have
>>> been identified as sensitive but aren't.
>
> The guidance is very similar.
>>
>> The real guidance appears here: http://www.ops.ietf.org/mib-security.htm=
l
>>
>> It would be very helpful if we can come up with an equivalent yang-secur=
ity.html document.
>>
> We can work with Benoit &Warren as it=E2=80=99s better for those writing =
the drafts to see it first, so I think the home should be the same.
>
> Best,
> Kathleen
>
>> Russ
>>
>>
>>> On Jan 8, 2018, at 4:43 PM, Kathleen Moriarty <kathleen.moriarty.ietf@g=
mail.com> wrote:
>>>
>>> Hello,
>>>
>>> We will be seeing many YANG module reviews come through, please don't
>>> let page counts scare you on these.  One of the main things to look
>>> for is that they used the Security Considerations template and filled
>>> it out, catching any data nodes that need to be enumerated in the
>>> considerations.
>>>
>>> Templates like this tend to get updated every time there's a new
>>> SecAD, :-) . As such, it'll likely be updated again in a few months.
>>> Here's the draft with the current template.  Have a look so you know
>>> key things to look for (transport security is called out and
>>> subtrees/data nodes of concern should be listed out).  Sometimes more
>>> is needed specific to the draft, but often times, this covers it.
>>>
>>> https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-10#page-52
>>>
>>> Thanks again for all your reviews, it is a tremendous help to us!
>>>
>>> --
>>>
>>> Best regards,
>>> Kathleen
>>



--=20

Best regards,
Kathleen


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https://trac.ietf.org/trac/ops/wiki/yang-security-guidelines

This is exactly what a SecDir reviewer will need.  Awesome.

Russ


> On Jan 11, 2018, at 11:21 AM, Kathleen Moriarty =
<kathleen.moriarty.ietf@gmail.com> wrote:
>=20
> Hello,
>=20
> As it turns out, there is a page:
>=20
> https://www.ietf.org/iesg/directorate/yang-doctors.html
>=20
> If anyone has comments on the bis draft with current security
> considerations template, please provide them to the WG.  Here is the
> link again for your convenience:
> https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-10#page-52
>=20
> Thank you!
>=20
> On Tue, Jan 9, 2018 at 2:15 PM, Kathleen Moriarty
> <kathleen.moriarty.ietf@gmail.com> wrote:
>> Hi Russ,
>>=20
>> Sent from my mobile device
>>=20
>>> On Jan 9, 2018, at 1:46 PM, Russ Housley <housley@vigilsec.com> =
wrote:
>>>=20
>>> For MIB modules, we came up with a short list of things or the =
SecDir Reviewer to do.  This is a quote from an email message in 2007:
>>>=20
>>>> The job of the security reviewers, then, is three-fold: first, to
>>>> verify the existence of the boilerplate; second, to verify the =
adequacy
>>>> of the explanations given for particular items; third -- and this =
is
>>>> the hardest -- to scan the document to see if other items should =
have
>>>> been identified as sensitive but aren't.
>>=20
>> The guidance is very similar.
>>>=20
>>> The real guidance appears here: =
http://www.ops.ietf.org/mib-security.html
>>>=20
>>> It would be very helpful if we can come up with an equivalent =
yang-security.html document.
>>>=20
>> We can work with Benoit &Warren as it=E2=80=99s better for those =
writing the drafts to see it first, so I think the home should be the =
same.
>>=20
>> Best,
>> Kathleen
>>=20
>>> Russ
>>>=20
>>>=20
>>>> On Jan 8, 2018, at 4:43 PM, Kathleen Moriarty =
<kathleen.moriarty.ietf@gmail.com> wrote:
>>>>=20
>>>> Hello,
>>>>=20
>>>> We will be seeing many YANG module reviews come through, please =
don't
>>>> let page counts scare you on these.  One of the main things to look
>>>> for is that they used the Security Considerations template and =
filled
>>>> it out, catching any data nodes that need to be enumerated in the
>>>> considerations.
>>>>=20
>>>> Templates like this tend to get updated every time there's a new
>>>> SecAD, :-) . As such, it'll likely be updated again in a few =
months.
>>>> Here's the draft with the current template.  Have a look so you =
know
>>>> key things to look for (transport security is called out and
>>>> subtrees/data nodes of concern should be listed out).  Sometimes =
more
>>>> is needed specific to the draft, but often times, this covers it.
>>>>=20
>>>> https://tools.ietf.org/html/draft-ietf-netmod-rfc6087bis-10#page-52
>>>>=20
>>>> Thanks again for all your reviews, it is a tremendous help to us!
>>>>=20
>>>> --
>>>>=20
>>>> Best regards,
>>>> Kathleen
>>>=20
>=20
>=20
>=20
> --=20
>=20
> Best regards,
> Kathleen


From nobody Thu Jan 11 10:42:33 2018
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From: Taylor Yu <tlyu@mit.edu>
To: Randall Gellens <rg+ietf@randy.pensive.org>
Cc: <iesg@ietf.org>, <secdir@ietf.org>, <draft-ietf-slim-negotiating-human-language.all@ietf.org>
References: <p06240600d67d2e5fcbb7@[99.111.97.136]>
Date: Thu, 11 Jan 2018 20:14:28 +0000
In-Reply-To: <p06240600d67d2e5fcbb7@[99.111.97.136]> (Randall Gellens's message of "Thu\, 11 Jan 2018 07\:10\:43 -0800")
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Subject: Re: [secdir] secdir review of draft-ietf-slim-negotiating-human-language-22
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Randall Gellens <rg+ietf@randy.pensive.org> writes:

> Thanks for your review.  In response to Alissa's comments, I reworded
> the Security Considerations section to read:
>
>    The Security Considerations of BCP 47 [RFC5646] apply here.  An
>    attacker with the ability to modify signaling could prevent a call
>    from succeeding by altering any of several crucial elements,
>    including the 'hlang-send' or 'hlang-recv' values.  RFC 5069
>    [RFC5069] discusses such threats.  Use of TLS or IPSec can protect
>    against such threats.  Emergency calls are of particular concern; RFC
>    6881 [RFC6881], which is specific to emergency calls, mandates use of
>    TLS or IPSec (in ED-57/SP-30).
>
> I think this also addresses your concern regarding integrity, as it
> specifically calls out "modification" as a principal threat.

Hi Randall,

Thanks.  This new text seems reasonable.

-Taylor


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Date: Thu, 11 Jan 2018 16:58:56 -0600
From: Benjamin Kaduk <kaduk@mit.edu>
To: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
Cc: Russ Housley <housley@vigilsec.com>, IETF SecDir <secdir@ietf.org>
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Subject: Re: [secdir] YANG Reviews
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On Thu, Jan 11, 2018 at 11:21:25AM -0500, Kathleen Moriarty wrote:
> Hello,
> 
> As it turns out, there is a page:
> 
> https://www.ietf.org/iesg/directorate/yang-doctors.html

Was this a casualty of the "new IETF website broke old links"?
Or was the intended link actually
https://trac.ietf.org/trac/ops/wiki/yang-security-guidelines as
appeared later?

-Ben


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Review instructions and related resources are at:
http://tools.ietf.org/area/sec/trac/wiki/SecDirReview

For telechat 2018-01-11

Reviewer               LC end     Draft
Shaun Cooley           2018-01-09 draft-ietf-netmod-rfc7223bis-03

For telechat 2018-01-25

Reviewer               LC end     Draft
Tim Polk               2018-01-16 draft-ietf-lwig-energy-efficient-08
Kyle Rose              2018-01-24 draft-ietf-dhc-rfc3315bis-10
Carl Wallace           2018-01-15 draft-ietf-netmod-rfc8022bis-08
Brian Weis             2018-01-16 draft-ietf-nfsv4-flex-files-15
Paul Wouters           2018-01-16 draft-ietf-lpwan-overview-07
Paul Wouters           2018-01-11 draft-ietf-ospf-ospfv3-lsa-extend-20

Last calls:

Reviewer               LC end     Draft
John Bradley           None       draft-ietf-acme-acme-09
Shaun Cooley           2018-01-11 draft-ietf-grow-bgp-gshut-13
Russ Mundy             2017-09-14 draft-spinosa-urn-lex-12

Early review requests:

Reviewer               Due        Draft
Ólafur Guðmundsson     2018-01-09 draft-ietf-opsawg-nat-yang-09

Next in the reviewer rotation:

  Liang Xia
  Tom Yu
  Dacheng Zhang
  Derek Atkins
  John Bradley
  Shaun Cooley
  Alan DeKok
  Donald Eastlake
  Shawn Emery
  Stephen Farrell


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Subject: [secdir] Secdir last call review of draft-ietf-nfsv4-flex-files-15
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Reviewer: Brian Weis
Review result: Has Issues

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 defines the Parallel Network File System (pNFS), which allows a
storage system to store the metadata for files onto a metadata server, and data
of that file onto a separate storage device. The document focuses on the
interaction between the two types of servers, and the requirements of clients
using a pNFS system.

The document describes two models by which the metadata server and file storage
server can communicate. One is a “tight coupling model”, in which the two types
of servers directly communicate. In this model the metadata server can ensure
that file access control state is synchronized between the two servers, and I
believe that level of access control is equivalent to NFS v4.x today. From a
security considerations perspective, this is perhaps best summarized in Section
2.2:

  “With tightly coupled storage devices, the metadata server sets the
   user and group owners, mode bits, and ACL of the data file to be the
   same as the metadata file.  And the client must authenticate with the
   storage device and go through the same authorization process it would
   go through via the metadata server.”

The other model is a “loose coupling model”, in which the client is
authenticated and authorized by the metadata server, and is given access to the
file server through the use credentials. However, there is no direct
communications between the metadata server and the file server. The metadata
server does not seem to provide a fine grained access control to files on the
file server, but instead relies upon the client to enforce a less granular
level of access control.

The Security Considerations section is well-written and helpful. I do have some
suggestions for improving it,  and also some questions.

(1) Section 2.2: should the “recommended” in the Note be RECOMMENDED?
Restricting access control to just superuser have access to the storage device
seems like a valuable advice.

(2) Section 2.2: The NOTE probably should provide guidance regarding protecting
the network connections between the metadata server and the file server. For
example, something like: “Communications between the metadata server and file
server need to secured. If there is not adequate physical security (i.e., the
servers are not co-located in a physically secure area), their communications
MUST be protected for confidentiality (e.g., using TLS or IPsec).”

(3) From the description of synthetic uids/gids in Section 2.2, I believe that
the full range of file permissions (e.g., owner r/w/x)  is honored in the
tightly coupled model, but are restricted in the loosely coupled model to
“owner r/w”, “group r”. If that is correct, I think the security considerations
should explicitly mention that the effect of access permissions is reduced on
the file server files.

(4) Section 2.2. In this phrase “it may be assigned some random synthetic
uid/gid to deny access”, would a better word for “random” be “unused” or
“unpredictable”? Also what is the security value intended by the use of a
“random” value for synthetic uids/gids?

(5) In the “loose coupling model” file access actually enforced by the client,
which presumably can be manipulated by an evil user. This is clearly stated n
Section 2.2: “ The client is thus solely responsible for enforcing file
permissions in a loosely coupled model.”  Also, Section 2.2.1 mentions “a
SETATTR would be sent to the storage device to set the owner and group of the
data file”, and since here is no control protocol between the metadata server
and the file server so I assume it is sent by the client.

Put another way, it seems as if any client that has credentials allowing it to
access to the file server can access any file on the file system if it is
chooses to do so (e.g.., if it is a malicious client). Is that correct?

Unless I’m mistaken, this is a serious reduction of actual security from NFS
4.x, and also from the tight coupling model. This should be clearly stated in
the security considerations section, so that protocol adopters and users
understand the additional risks of the loose coupling model. For this  reason,
I've marked the review with "Has Issues" rather than "Has Nits".


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From: Thomas Haynes <loghyr@primarydata.com>
To: Brian Weis <bew@cisco.com>
CC: "secdir@ietf.org" <secdir@ietf.org>, NFSv4 <nfsv4@ietf.org>, "draft-ietf-nfsv4-flex-files.all@ietf.org" <draft-ietf-nfsv4-flex-files.all@ietf.org>
Thread-Topic: [nfsv4] Secdir last call review of draft-ietf-nfsv4-flex-files-15
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Subject: Re: [secdir] [nfsv4] Secdir last call review of draft-ietf-nfsv4-flex-files-15
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From: "Brian Weis (bew)" <bew@cisco.com>
To: Thomas Haynes <loghyr@primarydata.com>
CC: "secdir@ietf.org" <secdir@ietf.org>, NFSv4 <nfsv4@ietf.org>, "draft-ietf-nfsv4-flex-files.all@ietf.org" <draft-ietf-nfsv4-flex-files.all@ietf.org>
Thread-Topic: [nfsv4] Secdir last call review of draft-ietf-nfsv4-flex-files-15
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Subject: Re: [secdir] [nfsv4] Secdir last call review of draft-ietf-nfsv4-flex-files-15
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To: Vincent Roca <vincent.roca@inria.fr>, IESG <iesg@ietf.org>, secdir@ietf.org, draft-ietf-intarea-broadcast-consider.all@ietf.org
References: <383EA7C8-CFF0-48AF-AD0C-840545483E94@inria.fr>
From: Rolf Winter <rolf.winter@hs-augsburg.de>
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Subject: Re: [secdir] Secdir review of draft-ietf-intarea-broadcast-consider-05
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Hi Vincent,

thanks for the detailed review and sorry for the belated reply. We have 
submitted a new version based on these comments and recommendations. 
Please see inline:

Am 05.01.18 um 14:26 schrieb Vincent Roca:
> 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.
> 
> Summary: *Ready with issues*
> 
> This document lists recommendations concerning the use of
> broadcast/multicast traffic from a privacy point of view, which is
> highly valuable. However I have a certain number of comments.
> (sorry if my email is a bit long…)
> 
> 
> *Main comments:*
> 
> 1) First of all, the focus of this document looks ambiguous.
> The title refers to "IP broadcast and multicast protocol designers"
> which I can understand as those low level protocols for IP broadcast
> and multicast (e.g., IGMP, MLD, and why not various multicast routing
> protocols, etc.). On the opposite, the abstract restricts the focus:
> "application-layer protocols make use of IP broadcasts or multicast
> messages" (1st sentence). Then, when reading the document, I sometimes
> understand that it could also consider lower layer protocols. This
> should be clarified.
> 
> Also, instead of "designers of broadcast/multicast protocols" I'd
> rather say "designers of protocols relying (in parts or totally) on
> broadcast/multicast traffic". This applies to the title (in a
> condensed version) and throughout the core of the document.

Makes complete sense. I hope we have spotted all occurences in the main 
text and also changed the title accordingly:

was: "Privacy considerations for IP broadcast and multicast protocol 
designers"

new: "Privacy considerations for protocols relying on IP broadcast and 
multicast"

> 
> 
> 2) Another point: I'd like to see the item (b) of introduction
> developed as this is the key issue with multicast/broadcast traffic.
> Without encryption, application messages are vulnerable to
> eavesdropping and all kinds of analyses. A group key could be
> negociated and used for encrypting this traffic, but this requires a
> more complex setup mechanism (typically a key management system,
> probably with re-keying and all the stuff) and requires a preliminary
> association of a terminal that is not necessarily compatible with the
> application-layer protocol features.
> The text could say that if possible, multicast/broadcast traffic
> encryption should be used, otherwise risks should be minimised as
> discussed in this document. And of course, it's always good to remind
> the designers that unicast traffic should be always encrypted since
> there's no good reason not to do that.
> 


We talk about this in the security considerations section and come to 
the same conclusion as you do:

"It should be noted that certain applications could make use of
    existing mechanisms to protect multicast traffic such as the ones
    defined in [RFC5374].  Examples of such applications can be found in
    Appendix A. of [RFC5374].  Given the required infrastructure and
    assumptions about these applications and the security infrastructure,
    many applications will not be able to make use of such mechanisms."

In which way would you expand on this?

> 
> 3) I'd like to suggest another recommendation: when applicable, limit
> or avoid user-originated broadcast/multicast messages, preferring
> infrastructure originated messages.
> An example: in a discovery mechanism, avoid terminal sollicitation as
> much as possible and limit oneself to infrastructure announcement
> broadcast messages, even if it can include some extra delay (controled
> with the announcement frequency). This is exactly what happened in
> Wifi AP discovery, where the passive discovery scheme, AP based, is
> now prefered to the active scheme.
> Said differently, multicast/broadcast is not per se the issue, when
> originating from the infrastructure it is generaly safe.
> 
> 

I think I disagree somewhat (and it is not a generally applicable use 
case, e.g. if resources on a host are offered there is no general way to 
delegate announcements of these to the infrastructure). Saying that 
infrastructure announcements are generally safe requires that a receiver 
can validate that a message came from the infrastructure which is a 
problem (e.g. rogue DHCP servers). A lot of deployments solve some of 
this through infrastructure means (e.g. DHCP snooping), but we have 
documented that. Also, whatever comes from the infrastructure requires a 
standard so that devices/apps understand it. We have text around that, too.


> 4) A more general comment, related to item (a) of intro:
> Broadcast/multicast can simplify user surveillance, I agree. However,
> when I'm looking at all the practicies of companies working in the
> advertising area (in particular A&A companies, sitting between
> smartphone users and advertisers, domain that I know a little bit),
> the techniques deployed are incredibly smart, some of them bypassing
> technical protections set up by the OS manufacturers, others relying
> on hidden technical features. It's impressive how inventive those
> companies can be.
> My point is that even if traffic is 100% unicast, as long as a
> wireless medium is used, anyone wanting to monitor users in order to
> profile them will set up the required hardware/software configuration.
> This is trivial and extremely cheap nowadays (except perhaps for 4G
> connections), and most of the time this is a purely passive
> monitoring. The unicast/multicast/broadcast nature of traffic has no
> importance as long as you are within wireless network range.


I think there is little that the IETF can do about that. Also "bypassing 
technical protection" and using "hidden technical features" is nothing 
you can protect against in general and I assume is often not by design.

> 
> 
> *Clarification needed:*
> 
> ** section 4: I cannot understand the meaning of "information" in:
>          "* You SHOULD try to design the protocol in a way that the
>           information cannot be correlated with other information in
>           broadcast/multicast messages"
> What does the first instance of "information" refer to?


Clarified.

> 
> 
> ** Last but one sentence of section 2.2: Why do you say "or at least
> much more difficult"? Without encryption, a persistant application
> layer identifier voids any lower layer attempt. I'd remove this
> comment altogether.


Done.


> 
> 
> *Various:*
> 
> ** the authors use the term "host name" to refer to a higher layer
> name of a device. To me this term refers to the DNS notion of
> "hostname", i.e. something different, hence confusion. I'd recommend
> to use "device name" in order to avoid it.

Well, RFC 7719 even admits the term is ill defined and does refer to 
various things. Also, for the protocols we looked at and OS 
configurations, sometimes there are different host namens being used for 
different purposes. We would like to stick with host names (also since 
RFC8117 useses the term which is highly relevant in this context).

> 
> ** section 2.3: instead of:
>          "If only a persistent ID is needed, this can be generated
>          randomly. »
> I'd rather say:
>          "Persistent identifiers SHOULD be avoided (section 2.2), but
>          if one is absolutely needed and if the devide name is not
>          required, then the identifier SHOULD be generated randomly."
> 

That would have not read nicely with the sentence before that. We made 
adjustments to that passage, based on this suggestion.

> 
> *Typos:*
> 
> ** section 4: s/broad-/broadcast/ in:
>          "because of the special nature of broad- and multicast."
> 
> ** section 5: "are" is missing in:
>          ...for another class of attacks that not related to privacy."
> 
> 

Nice catch.


Best,

Rolf

> Regards,
> 
>    Vincent


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class=3D""><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: =
space; line-break: after-white-space;" class=3D"">Hello Rolf,<div =
class=3D""><br class=3D""></div><div class=3D""><div =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">thanks for the detailed review =
and sorry for the belated reply. We have submitted a new version based =
on these comments and recommendations. Please see inline:</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""></div></blockquote><div class=3D""><br class=3D""></div><div =
class=3D"">You=E2=80=99re welcome.</div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><blockquote type=3D"cite" =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" =
class=3D"">2) Another point: I'd like to see the item (b) of =
introduction<br class=3D"">developed as this is the key issue with =
multicast/broadcast traffic.<br class=3D"">Without encryption, =
application messages are vulnerable to<br class=3D"">eavesdropping and =
all kinds of analyses. A group key could be<br class=3D"">negociated and =
used for encrypting this traffic, but this requires a<br class=3D"">more =
complex setup mechanism (typically a key management system,<br =
class=3D"">probably with re-keying and all the stuff) and requires a =
preliminary<br class=3D"">association of a terminal that is not =
necessarily compatible with the<br class=3D"">application-layer protocol =
features.<br class=3D"">The text could say that if possible, =
multicast/broadcast traffic<br class=3D"">encryption should be used, =
otherwise risks should be minimised as<br class=3D"">discussed in this =
document. And of course, it's always good to remind<br class=3D"">the =
designers that unicast traffic should be always encrypted since<br =
class=3D"">there's no good reason not to do that.<br =
class=3D""></blockquote><br style=3D"font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">We talk about this in the =
security considerations section and come to the same conclusion as you =
do:</span><br style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">"It should be noted that certain =
applications could make use of</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">&nbsp;&nbsp;existing mechanisms =
to protect multicast traffic such as the ones</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">&nbsp;&nbsp;defined in [RFC5374]. &nbsp;Examples =
of such applications can be found in</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">&nbsp;&nbsp;Appendix A. of =
[RFC5374]. &nbsp;Given the required infrastructure and</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">&nbsp;&nbsp;assumptions about these applications =
and the security infrastructure,</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">&nbsp;&nbsp;many applications =
will not be able to make use of such mechanisms."</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><br=
 style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">In which way would you expand on this?</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""></div></blockquote><div class=3D""><br class=3D""></div><div =
class=3D"">I=E2=80=99d like you extend a little the the bullet (b) of =
introduction:</div><div class=3D"">(b)  Encryption is more difficult =
when broadcast/multicast messages,</div><div class=3D"">&nbsp;&nbsp; =
&nbsp; &nbsp; &nbsp;leaving content of these messages in the clear and =
making it</div><div class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; &nbsp;easier =
to spoof and replay them.</div><div class=3D""><div class=3D"">It =
suggests that because it=E2=80=99s difficult, it won=E2=80=99t be used. =
This is not the</div><div class=3D"">message the I-D should carry. =
It=E2=80=99s difficult (add a reference here), sure,</div><div =
class=3D"">but not impossible. You can also briefly explain why it=E2=80=99=
s more difficult with</div><div class=3D"">multicast/broadcast.</div><div =
class=3D""><br class=3D""></div></div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><blockquote type=3D"cite" =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" =
class=3D"">3) I'd like to suggest another recommendation: when =
applicable, limit<br class=3D"">or avoid user-originated =
broadcast/multicast messages, preferring<br class=3D"">infrastructure =
originated messages.<br class=3D"">An example: in a discovery mechanism, =
avoid terminal sollicitation as<br class=3D"">much as possible and limit =
oneself to infrastructure announcement<br class=3D"">broadcast messages, =
even if it can include some extra delay (controled<br class=3D"">with =
the announcement frequency). This is exactly what happened in<br =
class=3D"">Wifi AP discovery, where the passive discovery scheme, AP =
based, is<br class=3D"">now prefered to the active scheme.<br =
class=3D"">Said differently, multicast/broadcast is not per se the =
issue, when<br class=3D"">originating from the infrastructure it is =
generaly safe.<br class=3D""></blockquote><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">I think I disagree somewhat (and =
it is not a generally applicable use case, e.g. if resources on a host =
are offered there is no general way to delegate announcements of these =
to the infrastructure). Saying that infrastructure announcements are =
generally safe requires that a receiver can validate that a message came =
from the infrastructure which is a problem (e.g. rogue DHCP servers). A =
lot of deployments solve some of this through infrastructure means (e.g. =
DHCP snooping), but we have documented that. Also, whatever comes from =
the infrastructure requires a standard so that devices/apps understand =
it. We have text around that, too.</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""></div></blockquote><div class=3D""><br class=3D""></div><div =
class=3D"">Let me clarify what I had in mind. A few years ago, discovery =
of a known WiFi AP</div><div class=3D"">from a device was accelerated =
through the use of an active mechanism, with the</div><div =
class=3D"">device sending probes to potentially detects those know WiFi =
APs. That was</div><div class=3D"">awful from a privacy point of view as =
highlighted by researchers. The trend was to</div><div class=3D"">move =
to a passive approach, relying mostly on AP announcements (in addition =
to</div><div class=3D"">MAC address randomisation). The privacy benefits =
while doing so are terrible.</div><div class=3D"">See e.g., my colleague =
Mathieu publication on the topic:&nbsp;<a =
href=3D"https://hal.inria.fr/hal-00747825" =
class=3D"">https://hal.inria.fr/hal-00747825</a></div><div class=3D"">This=
 is perfectly in line with your &nbsp;I-D. How privacy can be =
compromised by using</div><div class=3D"">a broadcast based =
protocol.&nbsp;</div><div class=3D""><br class=3D""></div><div =
class=3D"">Having said that, I agree with you that rogue announcements =
raise security concerns</div><div class=3D"">(but that=E2=80=99s true =
for any message sent), and it does not work for resources offered =
by</div><div class=3D"">a host. I agree, this is not a universal =
approach. I let you judge whether it makes sense</div><div class=3D"">to =
talk about it or not.</div><div class=3D""><br class=3D""></div><div =
class=3D""><br class=3D""></div><blockquote type=3D"cite" class=3D""><div =
class=3D""><blockquote type=3D"cite" style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; =
-webkit-text-stroke-width: 0px;" class=3D"">4) A more general comment, =
related to item (a) of intro:<br class=3D"">Broadcast/multicast can =
simplify user surveillance, I agree. However,<br class=3D"">when I'm =
looking at all the practicies of companies working in the<br =
class=3D"">advertising area (in particular A&amp;A companies, sitting =
between<br class=3D"">smartphone users and advertisers, domain that I =
know a little bit),<br class=3D"">the techniques deployed are incredibly =
smart, some of them bypassing<br class=3D"">technical protections set up =
by the OS manufacturers, others relying<br class=3D"">on hidden =
technical features. It's impressive how inventive those<br =
class=3D"">companies can be.<br class=3D"">My point is that even if =
traffic is 100% unicast, as long as a<br class=3D"">wireless medium is =
used, anyone wanting to monitor users in order to<br class=3D"">profile =
them will set up the required hardware/software configuration.<br =
class=3D"">This is trivial and extremely cheap nowadays (except perhaps =
for 4G<br class=3D"">connections), and most of the time this is a purely =
passive<br class=3D"">monitoring. The unicast/multicast/broadcast nature =
of traffic has no<br class=3D"">importance as long as you are within =
wireless network range.<br class=3D""></blockquote><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><br=
 style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">I think there is little that the IETF can do =
about that. Also "bypassing technical protection" and using "hidden =
technical features" is nothing you can protect against in general and I =
assume is often not by design.</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""></div></blockquote><div class=3D""><br class=3D""></div><div =
class=3D"">I agree and I don=E2=80=99t want to question the importance =
of this I-D here.</div><div class=3D"">But it remains that wireless =
communications are so easy to monitor.</div><div class=3D""><br =
class=3D""></div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><blockquote type=3D"cite" style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; =
-webkit-text-stroke-width: 0px;" class=3D"">*Various:*<br class=3D"">** =
the authors use the term "host name" to refer to a higher layer<br =
class=3D"">name of a device. To me this term refers to the DNS notion =
of<br class=3D"">"hostname", i.e. something different, hence confusion. =
I'd recommend<br class=3D"">to use "device name" in order to avoid =
it.<br class=3D""></blockquote><br style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">Well, RFC 7719 even admits the =
term is ill defined and does refer to various things. Also, for the =
protocols we looked at and OS configurations, sometimes there are =
different host namens being used for different purposes. We would like =
to stick with host names (also since RFC8117 useses the term which is =
highly relevant in this context).</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""></div></blockquote><div class=3D""><br class=3D""></div><div =
class=3D"">I was not aware of those RFCs. Do what you believe is the =
most appropriate.</div></div><div class=3D""><br =
class=3D""></div>Cheers,</div><div class=3D""><br class=3D""></div><div =
class=3D"">&nbsp; =
&nbsp;Vincent</div></div></div></div></div></div></body></html>=


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From: Stig Venaas <stig@venaas.com>
Date: Tue, 16 Jan 2018 09:51:26 -0800
Message-ID: <CAHANBtL8TmOFn1bq5qgCqjaHxHCuSeTDTD_gdwM56R4sJ2yFsQ@mail.gmail.com>
To: Liang Xia <frank.xialiang@huawei.com>
Cc: secdir@ietf.org, draft-ietf-pim-source-discovery-bsr.all@ietf.org,  ietf@ietf.org, pim@ietf.org, The IESG <iesg@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdir/9zFphKTJWbIxV0pux-UDmI33Lvk>
Subject: Re: [secdir] Secdir last call review of draft-ietf-pim-source-discovery-bsr-07
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Thanks for great feedback!

I've tried to address all of your comments. I'm planning to add this
paragraph to the security considerations.

PIM-SM link-local messages can be authenticated using IPsec, see
[RFC7761] section 6.3 and [RFC5796]. Since PFM messages are link-local
messages sent hop by hop, a link-local PFM message can be
authenticated using IPsec such that a router can verify that a message
was sent by a trusted neighbor and has not been modified. However, to
verify that a received message contains correct information announced
by the originator specified in the message, one will have to trust
every router on the path from the originator and that each router has
authenticated the received message.

Let me know if you have any comments on that paragraph.
Thanks,
Stig

On Sun, Jan 7, 2018 at 10:22 PM, Liang Xia <frank.xialiang@huawei.com> wrote:
> Reviewer: Liang Xia
> Review result: Has Issues
>
> Nits:
> 1. In Abstract, the abbreviation is missed when the Term are firstly appeared,
> such as: Sparse-Mode, Rendezvous Point; 2. Every word in the section titles
> should be in the capital form
>
> Issues:
> 1. In Security Considerations section,  should one sentence be "even if the
> sources are actually not active"? 2. Generally, the peer authentication (by
> certificate, shared key...) and the message integration protection are always
> helpful to defend against the forged routers and PEM messages, even the
> resulted resource consumption. But in current Security Considerations section,
> there is nothing discussed about these countermeasures, even in the general
> way. Suggest to consider this point personally.
>


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Subject: Re: [secdir] [nfsv4] Secdir last call review of draft-ietf-nfsv4-flex-files-15
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From: "Xialiang (Frank)" <frank.xialiang@huawei.com>
To: Stig Venaas <stig@venaas.com>
CC: "secdir@ietf.org" <secdir@ietf.org>, "draft-ietf-pim-source-discovery-bsr.all@ietf.org" <draft-ietf-pim-source-discovery-bsr.all@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "pim@ietf.org" <pim@ietf.org>, The IESG <iesg@ietf.org>
Thread-Topic: Secdir last call review of draft-ietf-pim-source-discovery-bsr-07
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From: Kyle Rose <krose@krose.org>
Date: Wed, 17 Jan 2018 16:37:11 -0500
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Subject: [secdir] Secdir last call review of draft-dhcwg-dhc-rfc3315bis-10
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Reviewer: Kyle Rose
Review result: Ready with issues

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.

13.1: "By default, DHCP server implementations SHOULD NOT generate
predictable addresses." The justification for this is not addressed in the
security considerations section, while the privacy considerations section
might be punting this to RFC 7824, though the only mention I can find in a
quick search regards iterative allocation in section 4.3.

20.4.1: RKAP uses HMAC-MD5 for symmetric authentication. As an
informational matter for an existing protocol, this is certainly justified,
but I don't know how the IETF handles obsolete crypto in standards
revisions.

20.4.3: "...the client computes an HMAC-MD5 over the DHCP Reconfigure
message [ADD: with zeroes substituted for the HMAC-MD5 field], using the
Reconfigure Key received from the server"

22. DHCP's security threat model is not clearly stated. For instance, RKAP
provides protection against man-on-the-side reconfiguration attacks, but
DHCP has no ability by itself to protect against a race between legitimate
and rogue DHCP servers: such protection relies on management of multicast
groups at layer 2. This is implied by the paragraph on snooping DHCP
multicast traffic, but nowhere is it specified normatively that restrictive
group management is necessary to eliminate this part of the attack surface.
Similarly, it's not clear to me whether a rogue or misconfigured server
temporarily in the All_DHCP_Servers or All_DHCP_Relay_Agents_and_Servers
multicast group can then hide a client from the official DHCP servers
forever by sending it the unicast option, thus maintaining exclusive access
to certain messages, notabley Request and Renew. The threat model should be
stated clearly in this document, even if the recommended countermeasures
are in some other RFC (such as RFC 7610) because they rely on information
not in this document.

23. Does it make sense to clarify the threat model for privacy? For
instance, this protocol doesn't try to defend clients against tracking
within a LAN that can observe the DHCP traffic. I can guess what the threat
model is, but ISTM that it should be specified explicitly.

--001a1147374669e4890562ffa6af
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Reviewer: Kyle Rose<br></div>Review result: Ready wit=
h issues<br><div><div><br>I have reviewed this document as part of the secu=
rity directorate&#39;s ongoing effort to review all IETF documents being pr=
ocessed by the IESG.=C2=A0 These comments were written primarily for the be=
nefit of the security area directors.=C2=A0 Document editors and WG chairs =
should treat these comments just like any other last call comments.<br><br>=
13.1: &quot;By default, DHCP server implementations SHOULD NOT generate pre=
dictable addresses.&quot; The justification for this is not addressed in th=
e security considerations section, while the privacy considerations section=
 might be punting this to RFC 7824, though the only mention I can find in a=
 quick search regards iterative allocation in section 4.3.<br><br>20.4.1: R=
KAP uses HMAC-MD5 for symmetric authentication. As an informational matter =
for an existing protocol, this is certainly justified, but I don&#39;t know=
 how the IETF handles obsolete crypto in standards revisions.<br><br>20.4.3=
: &quot;...the client computes an HMAC-MD5 over the DHCP Reconfigure messag=
e [ADD: with zeroes substituted for the HMAC-MD5 field], using the Reconfig=
ure Key received from the server&quot;<br><br>22. DHCP&#39;s security threa=
t model is not clearly stated. For instance, RKAP provides protection again=
st man-on-the-side reconfiguration attacks, but DHCP has no ability by itse=
lf to protect against a race between legitimate and rogue DHCP servers: suc=
h protection relies on management of multicast groups at layer 2. This is i=
mplied by the paragraph on snooping DHCP multicast traffic, but nowhere is =
it specified normatively that restrictive group management is necessary to =
eliminate this part of the attack surface. Similarly, it&#39;s not clear to=
 me whether a rogue or misconfigured server temporarily in the All_DHCP_Ser=
vers or All_DHCP_Relay_Agents_and_Servers multicast group can then hide a c=
lient from the official DHCP servers forever by sending it the unicast opti=
on, thus maintaining exclusive access to certain messages, notabley Request=
 and Renew. The threat model should be stated clearly in this document, eve=
n if the recommended countermeasures are in some other RFC (such as RFC 761=
0) because they rely on information not in this document.<br><br>23. Does i=
t make sense to clarify the threat model for privacy? For instance, this pr=
otocol doesn&#39;t try to defend clients against tracking within a LAN that=
 can observe the DHCP traffic. I can guess what the threat model is, but IS=
TM that it should be specified explicitly.<br><br><br></div></div></div>

--001a1147374669e4890562ffa6af--


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From: Kyle Rose <krose@krose.org>
Date: Wed, 17 Jan 2018 16:39:38 -0500
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Subject: [secdir] Secdir last call review of draft-ietf-dhc-rfc3315bis-10
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--001a11482cbe2f2cf80562ffaf14
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Let me try sending this to the right .all address.

Reviewer: Kyle Rose
Review result: Ready with issues

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.

13.1: "By default, DHCP server implementations SHOULD NOT generate
predictable addresses." The justification for this is not addressed in the
security considerations section, while the privacy considerations section
might be punting this to RFC 7824, though the only mention I can find in a
quick search regards iterative allocation in section 4.3.

20.4.1: RKAP uses HMAC-MD5 for symmetric authentication. As an
informational matter for an existing protocol, this is certainly justified,
but I don't know how the IETF handles obsolete crypto in standards
revisions.

20.4.3: "...the client computes an HMAC-MD5 over the DHCP Reconfigure
message [ADD: with zeroes substituted for the HMAC-MD5 field], using the
Reconfigure Key received from the server"

22. DHCP's security threat model is not clearly stated. For instance, RKAP
provides protection against man-on-the-side reconfiguration attacks, but
DHCP has no ability by itself to protect against a race between legitimate
and rogue DHCP servers: such protection relies on management of multicast
groups at layer 2. This is implied by the paragraph on snooping DHCP
multicast traffic, but nowhere is it specified normatively that restrictive
group management is necessary to eliminate this part of the attack surface.
Similarly, it's not clear to me whether a rogue or misconfigured server
temporarily in the All_DHCP_Servers or All_DHCP_Relay_Agents_and_Servers
multicast group can then hide a client from the official DHCP servers
forever by sending it the unicast option, thus maintaining exclusive access
to certain messages, notabley Request and Renew. The threat model should be
stated clearly in this document, even if the recommended countermeasures
are in some other RFC (such as RFC 7610) because they rely on information
not in this document.

23. Does it make sense to clarify the threat model for privacy? For
instance, this protocol doesn't try to defend clients against tracking
within a LAN that can observe the DHCP traffic. I can guess what the threat
model is, but ISTM that it should be specified explicitly.

--001a11482cbe2f2cf80562ffaf14
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Let me try sending this to the right .all address.<br><br>=
<div><div class=3D"gmail_quote">Reviewer: Kyle Rose<br><div dir=3D"ltr">Rev=
iew result: Ready with issues<br><div><div><br>I
 have reviewed this document as part of the security directorate&#39;s=20
ongoing effort to review all IETF documents being processed by the=20
IESG.=C2=A0 These comments were written primarily for the benefit of the=20
security area directors.=C2=A0 Document editors and WG chairs should treat=
=20
these comments just like any other last call comments.<br><br>13.1: &quot;B=
y=20
default, DHCP server implementations SHOULD NOT generate predictable=20
addresses.&quot; The justification for this is not addressed in the securit=
y=20
considerations section, while the privacy considerations section might=20
be punting this to RFC 7824, though the only mention I can find in a=20
quick search regards iterative allocation in section 4.3.<br><br>20.4.1:
 RKAP uses HMAC-MD5 for symmetric authentication. As an informational=20
matter for an existing protocol, this is certainly justified, but I=20
don&#39;t know how the IETF handles obsolete crypto in standards revisions.=
<br><br>20.4.3:
 &quot;...the client computes an HMAC-MD5 over the DHCP Reconfigure message=
=20
[ADD: with zeroes substituted for the HMAC-MD5 field], using the=20
Reconfigure Key received from the server&quot;<br><br>22. DHCP&#39;s securi=
ty=20
threat model is not clearly stated. For instance, RKAP provides=20
protection against man-on-the-side reconfiguration attacks, but DHCP has
 no ability by itself to protect against a race between legitimate and=20
rogue DHCP servers: such protection relies on management of multicast=20
groups at layer 2. This is implied by the paragraph on snooping DHCP=20
multicast traffic, but nowhere is it specified normatively that=20
restrictive group management is necessary to eliminate this part of the=20
attack surface. Similarly, it&#39;s not clear to me whether a rogue or=20
misconfigured server temporarily in the All_DHCP_Servers or=20
All_DHCP_Relay_Agents_and_<wbr>Servers multicast group can then hide a=20
client from the official DHCP servers forever by sending it the unicast=20
option, thus maintaining exclusive access to certain messages, notabley=20
Request and Renew. The threat model should be stated clearly in this=20
document, even if the recommended countermeasures are in some other RFC=20
(such as RFC 7610) because they rely on information not in this=20
document.<br><br>23. Does it make sense to clarify the threat model for=20
privacy? For instance, this protocol doesn&#39;t try to defend clients=20
against tracking within a LAN that can observe the DHCP traffic. I can=20
guess what the threat model is, but ISTM that it should be specified=20
explicitly.<br><br><br></div></div></div>
</div><br></div></div>

--001a11482cbe2f2cf80562ffaf14--


From nobody Thu Jan 18 14:55:10 2018
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Review instructions and related resources are at:
http://tools.ietf.org/area/sec/trac/wiki/SecDirReview

For telechat 2018-01-25

Reviewer               LC end     Draft
Tim Polk               2018-01-16 draft-ietf-lwig-energy-efficient-08
Vincent Roca          R2018-01-16 draft-ietf-intarea-broadcast-consider-06
Carl Wallace           2018-01-15 draft-ietf-netmod-rfc8022bis-09
Paul Wouters           2018-01-16 draft-ietf-lpwan-overview-07
Paul Wouters           2018-01-11 draft-ietf-ospf-ospfv3-lsa-extend-20

For telechat 2018-02-08

Reviewer               LC end     Draft
Derek Atkins           2018-01-31 draft-ietf-bier-mvpn-09
Donald Eastlake        2018-01-31 draft-farrel-sfc-convent-05
Brian Weis            R2018-01-26 draft-ietf-idr-bgp-prefix-sid-10
Liang Xia              2018-01-31 draft-ietf-rtgwg-ni-model-06
Taylor Yu              2018-01-31 draft-ietf-rtgwg-lne-model-05
Dacheng Zhang          2018-01-31 draft-ietf-mtgvenue-iaoc-venue-selection-process-11

Last calls:

Reviewer               LC end     Draft
John Bradley           None       draft-ietf-acme-acme-09
Shawn Emery            2018-01-26 draft-ietf-mmusic-trickle-ice-sip-12
Stephen Farrell        2018-01-26 draft-ietf-ice-rfc5245bis-16
Russ Mundy             2017-09-14 draft-spinosa-urn-lex-12

Early review requests:

Reviewer               Due        Draft
Daniel Franke          2018-01-31 draft-ietf-intarea-provisioning-domains-00
Ólafur Guðmundsson     2018-01-09 draft-ietf-opsawg-nat-yang-09

Next in the reviewer rotation:

  Daniel Gillmor
  Tobias Gondrom
  Ólafur Guðmundsson
  Phillip Hallam-Baker
  Steve Hanna
  Dan Harkins
  Paul Hoffman
  Russ Housley
  Christian Huitema
  Leif Johansson


From nobody Fri Jan 19 01:24:07 2018
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Date: Fri, 19 Jan 2018 01:23:56 -0800
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Subject: [secdir] Secdir last call review of draft-ietf-rtgwg-ni-model-06
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Reviewer: Liang Xia
Review result: Has Issues

For the section of Security Considerations:
1. you may refer to templete in
https://trac.ietf.org/trac/ops/wiki/yang-security-guidelines to add some
required general security considerations;

2. According to the above templete, [RFC5246], [RFC6241], [RFC6242], [RFC6536],
and [RFC8040] must be "normative references";

3. I don't see the security consideration content about the readable data
nodes. Is it missed, or there are not such readable date nodes need to be
considered?


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From: "Bernie Volz (volz)" <volz@cisco.com>
To: Kyle Rose <krose@krose.org>
CC: The IESG <iesg@ietf.org>, "secdir@ietf.org" <secdir@ietf.org>, "draft-ietf-dhc-rfc3315bis.all@ietf.org" <draft-ietf-dhc-rfc3315bis.all@ietf.org>
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From: Vincent Roca <vincent.roca@inria.fr>
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This is a re-review. My answer below, sent on Jan. 16th,  also applies =
to version -07.

Summary: Almost ready

Most of my initial comments have been addressed by the authors.

I made a few suggestions/clarifications (below), in addition to my =
initial review.

I would insist on implementing the first one, 2), beginning with:
	"I=E2=80=99d like you extend a little the the bullet (b) of =
introduction: =E2=80=A6 =C2=BB

but let the authors judge what they prefer to do for the next ones.

Regards,

  Vincent



> Le 16 janv. 2018 =C3=A0 09:50, Vincent Roca <vincent.roca@inria.fr> a =
=C3=A9crit :
>=20
> Hello Rolf,
>=20
>> thanks for the detailed review and sorry for the belated reply. We =
have submitted a new version based on these comments and =
recommendations. Please see inline:
>=20
> You=E2=80=99re welcome.
>=20
>>> 2) Another point: I'd like to see the item (b) of introduction
>>> developed as this is the key issue with multicast/broadcast traffic.
>>> Without encryption, application messages are vulnerable to
>>> eavesdropping and all kinds of analyses. A group key could be
>>> negociated and used for encrypting this traffic, but this requires a
>>> more complex setup mechanism (typically a key management system,
>>> probably with re-keying and all the stuff) and requires a =
preliminary
>>> association of a terminal that is not necessarily compatible with =
the
>>> application-layer protocol features.
>>> The text could say that if possible, multicast/broadcast traffic
>>> encryption should be used, otherwise risks should be minimised as
>>> discussed in this document. And of course, it's always good to =
remind
>>> the designers that unicast traffic should be always encrypted since
>>> there's no good reason not to do that.
>>=20
>>=20
>> We talk about this in the security considerations section and come to =
the same conclusion as you do:
>>=20
>> "It should be noted that certain applications could make use of
>>   existing mechanisms to protect multicast traffic such as the ones
>>   defined in [RFC5374].  Examples of such applications can be found =
in
>>   Appendix A. of [RFC5374].  Given the required infrastructure and
>>   assumptions about these applications and the security =
infrastructure,
>>   many applications will not be able to make use of such mechanisms."
>>=20
>> In which way would you expand on this?
>=20
> I=E2=80=99d like you extend a little the the bullet (b) of =
introduction:
> (b) Encryption is more difficult when broadcast/multicast messages,
>         leaving content of these messages in the clear and making it
>         easier to spoof and replay them.
> It suggests that because it=E2=80=99s difficult, it won=E2=80=99t be =
used. This is not the
> message the I-D should carry. It=E2=80=99s difficult (add a reference =
here), sure,
> but not impossible. You can also briefly explain why it=E2=80=99s more =
difficult with
> multicast/broadcast.
>=20
>=20
>>> 3) I'd like to suggest another recommendation: when applicable, =
limit
>>> or avoid user-originated broadcast/multicast messages, preferring
>>> infrastructure originated messages.
>>> An example: in a discovery mechanism, avoid terminal sollicitation =
as
>>> much as possible and limit oneself to infrastructure announcement
>>> broadcast messages, even if it can include some extra delay =
(controled
>>> with the announcement frequency). This is exactly what happened in
>>> Wifi AP discovery, where the passive discovery scheme, AP based, is
>>> now prefered to the active scheme.
>>> Said differently, multicast/broadcast is not per se the issue, when
>>> originating from the infrastructure it is generaly safe.
>>=20
>> I think I disagree somewhat (and it is not a generally applicable use =
case, e.g. if resources on a host are offered there is no general way to =
delegate announcements of these to the infrastructure). Saying that =
infrastructure announcements are generally safe requires that a receiver =
can validate that a message came from the infrastructure which is a =
problem (e.g. rogue DHCP servers). A lot of deployments solve some of =
this through infrastructure means (e.g. DHCP snooping), but we have =
documented that. Also, whatever comes from the infrastructure requires a =
standard so that devices/apps understand it. We have text around that, =
too.
>=20
> Let me clarify what I had in mind. A few years ago, discovery of a =
known WiFi AP
> from a device was accelerated through the use of an active mechanism, =
with the
> device sending probes to potentially detects those know WiFi APs. That =
was
> awful from a privacy point of view as highlighted by researchers. The =
trend was to
> move to a passive approach, relying mostly on AP announcements (in =
addition to
> MAC address randomisation). The privacy benefits while doing so are =
terrible.
> See e.g., my colleague Mathieu publication on the topic: =
https://hal.inria.fr/hal-00747825 <https://hal.inria.fr/hal-00747825>
> This is perfectly in line with your  I-D. How privacy can be =
compromised by using
> a broadcast based protocol.=20
>=20
> Having said that, I agree with you that rogue announcements raise =
security concerns
> (but that=E2=80=99s true for any message sent), and it does not work =
for resources offered by
> a host. I agree, this is not a universal approach. I let you judge =
whether it makes sense
> to talk about it or not.
>=20
>=20
>>> 4) A more general comment, related to item (a) of intro:
>>> Broadcast/multicast can simplify user surveillance, I agree. =
However,
>>> when I'm looking at all the practicies of companies working in the
>>> advertising area (in particular A&A companies, sitting between
>>> smartphone users and advertisers, domain that I know a little bit),
>>> the techniques deployed are incredibly smart, some of them bypassing
>>> technical protections set up by the OS manufacturers, others relying
>>> on hidden technical features. It's impressive how inventive those
>>> companies can be.
>>> My point is that even if traffic is 100% unicast, as long as a
>>> wireless medium is used, anyone wanting to monitor users in order to
>>> profile them will set up the required hardware/software =
configuration.
>>> This is trivial and extremely cheap nowadays (except perhaps for 4G
>>> connections), and most of the time this is a purely passive
>>> monitoring. The unicast/multicast/broadcast nature of traffic has no
>>> importance as long as you are within wireless network range.
>>=20
>>=20
>> I think there is little that the IETF can do about that. Also =
"bypassing technical protection" and using "hidden technical features" =
is nothing you can protect against in general and I assume is often not =
by design.
>=20
> I agree and I don=E2=80=99t want to question the importance of this =
I-D here.
> But it remains that wireless communications are so easy to monitor.
>=20
>=20
>>> *Various:*
>>> ** the authors use the term "host name" to refer to a higher layer
>>> name of a device. To me this term refers to the DNS notion of
>>> "hostname", i.e. something different, hence confusion. I'd recommend
>>> to use "device name" in order to avoid it.
>>=20
>> Well, RFC 7719 even admits the term is ill defined and does refer to =
various things. Also, for the protocols we looked at and OS =
configurations, sometimes there are different host namens being used for =
different purposes. We would like to stick with host names (also since =
RFC8117 useses the term which is highly relevant in this context).
>=20
> I was not aware of those RFCs. Do what you believe is the most =
appropriate.
>=20
> Cheers,
>=20
>    Vincent


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><div =
class=3D"">This is a re-review. My answer below, sent on Jan. 16th, =
&nbsp;also applies to version -07.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Summary: <b class=3D"">Almost r</b><b =
class=3D"">eady</b></div><div class=3D""><br class=3D""></div><div =
class=3D"">Most of my initial comments have been addressed by the =
authors.</div><div class=3D""><br class=3D""></div><div class=3D"">I =
made a few suggestions/clarifications (below), in addition to my initial =
review.</div><div class=3D""><br class=3D""></div><div class=3D"">I =
would insist on implementing the first one, 2), beginning =
with:</div><div class=3D""><span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span>"I=E2=80=99d like you extend a =
little the the bullet (b) of introduction: =E2=80=A6&nbsp;=C2=BB</div><div=
 class=3D""><br class=3D""></div><div class=3D"">but let the authors =
judge what they prefer to do for the next ones.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Regards,</div><div class=3D""><br =
class=3D""></div><div class=3D"">&nbsp; Vincent</div><div class=3D""><br =
class=3D""></div><br class=3D""><div class=3D"">
<div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;" class=3D""><div style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div style=3D"color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br =
class=3D""></div></div></div></div><div><blockquote type=3D"cite" =
class=3D""><div class=3D"">Le 16 janv. 2018 =C3=A0 09:50, Vincent Roca =
&lt;<a href=3D"mailto:vincent.roca@inria.fr" =
class=3D"">vincent.roca@inria.fr</a>&gt; a =C3=A9crit :</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div dir=3D"auto" =
style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; line-break: =
after-white-space;" class=3D""><meta http-equiv=3D"Content-Type" =
content=3D"text/html; charset=3Dutf-8" class=3D""><div style=3D"word-wrap:=
 break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" =
class=3D""><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8" class=3D""><div style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><meta=
 http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8" =
class=3D""><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: =
space; line-break: after-white-space;" class=3D""><meta =
http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8" =
class=3D""><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: =
space; line-break: after-white-space;" class=3D""><meta =
http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8" =
class=3D""><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: =
space; line-break: after-white-space;" class=3D"">Hello Rolf,<div =
class=3D""><br class=3D""></div><div class=3D""><div =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">thanks for the detailed review =
and sorry for the belated reply. We have submitted a new version based =
on these comments and recommendations. Please see inline:</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""></div></blockquote><div class=3D""><br class=3D""></div><div =
class=3D"">You=E2=80=99re welcome.</div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><blockquote type=3D"cite" =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" =
class=3D"">2) Another point: I'd like to see the item (b) of =
introduction<br class=3D"">developed as this is the key issue with =
multicast/broadcast traffic.<br class=3D"">Without encryption, =
application messages are vulnerable to<br class=3D"">eavesdropping and =
all kinds of analyses. A group key could be<br class=3D"">negociated and =
used for encrypting this traffic, but this requires a<br class=3D"">more =
complex setup mechanism (typically a key management system,<br =
class=3D"">probably with re-keying and all the stuff) and requires a =
preliminary<br class=3D"">association of a terminal that is not =
necessarily compatible with the<br class=3D"">application-layer protocol =
features.<br class=3D"">The text could say that if possible, =
multicast/broadcast traffic<br class=3D"">encryption should be used, =
otherwise risks should be minimised as<br class=3D"">discussed in this =
document. And of course, it's always good to remind<br class=3D"">the =
designers that unicast traffic should be always encrypted since<br =
class=3D"">there's no good reason not to do that.<br =
class=3D""></blockquote><br style=3D"font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">We talk about this in the =
security considerations section and come to the same conclusion as you =
do:</span><br style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">"It should be noted that certain =
applications could make use of</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">&nbsp;&nbsp;existing mechanisms =
to protect multicast traffic such as the ones</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">&nbsp;&nbsp;defined in [RFC5374]. &nbsp;Examples =
of such applications can be found in</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">&nbsp;&nbsp;Appendix A. of =
[RFC5374]. &nbsp;Given the required infrastructure and</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">&nbsp;&nbsp;assumptions about these applications =
and the security infrastructure,</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">&nbsp;&nbsp;many applications =
will not be able to make use of such mechanisms."</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><br=
 style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">In which way would you expand on this?</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""></div></blockquote><div class=3D""><br class=3D""></div><div =
class=3D"">I=E2=80=99d like you extend a little the the bullet (b) of =
introduction:</div><div class=3D"">(b)  Encryption is more difficult =
when broadcast/multicast messages,</div><div class=3D"">&nbsp;&nbsp; =
&nbsp; &nbsp; &nbsp;leaving content of these messages in the clear and =
making it</div><div class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; &nbsp;easier =
to spoof and replay them.</div><div class=3D""><div class=3D"">It =
suggests that because it=E2=80=99s difficult, it won=E2=80=99t be used. =
This is not the</div><div class=3D"">message the I-D should carry. =
It=E2=80=99s difficult (add a reference here), sure,</div><div =
class=3D"">but not impossible. You can also briefly explain why it=E2=80=99=
s more difficult with</div><div class=3D"">multicast/broadcast.</div><div =
class=3D""><br class=3D""></div></div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><blockquote type=3D"cite" =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" =
class=3D"">3) I'd like to suggest another recommendation: when =
applicable, limit<br class=3D"">or avoid user-originated =
broadcast/multicast messages, preferring<br class=3D"">infrastructure =
originated messages.<br class=3D"">An example: in a discovery mechanism, =
avoid terminal sollicitation as<br class=3D"">much as possible and limit =
oneself to infrastructure announcement<br class=3D"">broadcast messages, =
even if it can include some extra delay (controled<br class=3D"">with =
the announcement frequency). This is exactly what happened in<br =
class=3D"">Wifi AP discovery, where the passive discovery scheme, AP =
based, is<br class=3D"">now prefered to the active scheme.<br =
class=3D"">Said differently, multicast/broadcast is not per se the =
issue, when<br class=3D"">originating from the infrastructure it is =
generaly safe.<br class=3D""></blockquote><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">I think I disagree somewhat (and =
it is not a generally applicable use case, e.g. if resources on a host =
are offered there is no general way to delegate announcements of these =
to the infrastructure). Saying that infrastructure announcements are =
generally safe requires that a receiver can validate that a message came =
from the infrastructure which is a problem (e.g. rogue DHCP servers). A =
lot of deployments solve some of this through infrastructure means (e.g. =
DHCP snooping), but we have documented that. Also, whatever comes from =
the infrastructure requires a standard so that devices/apps understand =
it. We have text around that, too.</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""></div></blockquote><div class=3D""><br class=3D""></div><div =
class=3D"">Let me clarify what I had in mind. A few years ago, discovery =
of a known WiFi AP</div><div class=3D"">from a device was accelerated =
through the use of an active mechanism, with the</div><div =
class=3D"">device sending probes to potentially detects those know WiFi =
APs. That was</div><div class=3D"">awful from a privacy point of view as =
highlighted by researchers. The trend was to</div><div class=3D"">move =
to a passive approach, relying mostly on AP announcements (in addition =
to</div><div class=3D"">MAC address randomisation). The privacy benefits =
while doing so are terrible.</div><div class=3D"">See e.g., my colleague =
Mathieu publication on the topic:&nbsp;<a =
href=3D"https://hal.inria.fr/hal-00747825" =
class=3D"">https://hal.inria.fr/hal-00747825</a></div><div class=3D"">This=
 is perfectly in line with your &nbsp;I-D. How privacy can be =
compromised by using</div><div class=3D"">a broadcast based =
protocol.&nbsp;</div><div class=3D""><br class=3D""></div><div =
class=3D"">Having said that, I agree with you that rogue announcements =
raise security concerns</div><div class=3D"">(but that=E2=80=99s true =
for any message sent), and it does not work for resources offered =
by</div><div class=3D"">a host. I agree, this is not a universal =
approach. I let you judge whether it makes sense</div><div class=3D"">to =
talk about it or not.</div><div class=3D""><br class=3D""></div><div =
class=3D""><br class=3D""></div><blockquote type=3D"cite" class=3D""><div =
class=3D""><blockquote type=3D"cite" style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; =
-webkit-text-stroke-width: 0px;" class=3D"">4) A more general comment, =
related to item (a) of intro:<br class=3D"">Broadcast/multicast can =
simplify user surveillance, I agree. However,<br class=3D"">when I'm =
looking at all the practicies of companies working in the<br =
class=3D"">advertising area (in particular A&amp;A companies, sitting =
between<br class=3D"">smartphone users and advertisers, domain that I =
know a little bit),<br class=3D"">the techniques deployed are incredibly =
smart, some of them bypassing<br class=3D"">technical protections set up =
by the OS manufacturers, others relying<br class=3D"">on hidden =
technical features. It's impressive how inventive those<br =
class=3D"">companies can be.<br class=3D"">My point is that even if =
traffic is 100% unicast, as long as a<br class=3D"">wireless medium is =
used, anyone wanting to monitor users in order to<br class=3D"">profile =
them will set up the required hardware/software configuration.<br =
class=3D"">This is trivial and extremely cheap nowadays (except perhaps =
for 4G<br class=3D"">connections), and most of the time this is a purely =
passive<br class=3D"">monitoring. The unicast/multicast/broadcast nature =
of traffic has no<br class=3D"">importance as long as you are within =
wireless network range.<br class=3D""></blockquote><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><br=
 style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">I think there is little that the IETF can do =
about that. Also "bypassing technical protection" and using "hidden =
technical features" is nothing you can protect against in general and I =
assume is often not by design.</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""></div></blockquote><div class=3D""><br class=3D""></div><div =
class=3D"">I agree and I don=E2=80=99t want to question the importance =
of this I-D here.</div><div class=3D"">But it remains that wireless =
communications are so easy to monitor.</div><div class=3D""><br =
class=3D""></div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><blockquote type=3D"cite" style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; =
-webkit-text-stroke-width: 0px;" class=3D"">*Various:*<br class=3D"">** =
the authors use the term "host name" to refer to a higher layer<br =
class=3D"">name of a device. To me this term refers to the DNS notion =
of<br class=3D"">"hostname", i.e. something different, hence confusion. =
I'd recommend<br class=3D"">to use "device name" in order to avoid =
it.<br class=3D""></blockquote><br style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">Well, RFC 7719 even admits the =
term is ill defined and does refer to various things. Also, for the =
protocols we looked at and OS configurations, sometimes there are =
different host namens being used for different purposes. We would like =
to stick with host names (also since RFC8117 useses the term which is =
highly relevant in this context).</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""></div></blockquote><div class=3D""><br class=3D""></div><div =
class=3D"">I was not aware of those RFCs. Do what you believe is the =
most appropriate.</div></div><div class=3D""><br =
class=3D""></div>Cheers,</div><div class=3D""><br class=3D""></div><div =
class=3D"">&nbsp; =
&nbsp;Vincent</div></div></div></div></div></div></div></div></blockquote>=
</div><br class=3D""></body></html>=

--Apple-Mail=_351A80C2-6966-4850-A879-A327113FB7FF--


From nobody Fri Jan 19 07:20:15 2018
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To: Vincent Roca <vincent.roca@inria.fr>, IESG <iesg@ietf.org>, secdir@ietf.org, draft-ietf-intarea-broadcast-consider.all@ietf.org
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From: Rolf Winter <rolf.winter@hs-augsburg.de>
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Date: Fri, 19 Jan 2018 16:20:01 +0100
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdir/f3Bcz1yKlE-g9awhfHSjKvMWOR8>
Subject: Re: [secdir] Secdir review of draft-ietf-intarea-broadcast-consider-07
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Hi Vincent,

we have not forgotten about this point. You say about the text that:

"It suggests that because it’s difficult, it won’t be used. This is not 
the message the I-D should carry."

The reality today is, that it is not used, even for IETF-specified 
protocols it is mostly not specified. We still think about a good way to 
phrase it without making a point about this and then having to admit 
that the IETF itself has failed at doing it, which would be hypocitical.

Best,

Rolf

Am 19.01.18 um 16:10 schrieb Vincent Roca:
> This is a re-review. My answer below, sent on Jan. 16th,  also applies 
> to version -07.
> 
> Summary: *Almost r**eady*
> 
> Most of my initial comments have been addressed by the authors.
> 
> I made a few suggestions/clarifications (below), in addition to my 
> initial review.
> 
> I would insist on implementing the first one, 2), beginning with:
> "I’d like you extend a little the the bullet (b) of introduction: … »
> 
> but let the authors judge what they prefer to do for the next ones.
> 
> Regards,
> 
>    Vincent
> 
> 
> 
>> Le 16 janv. 2018 à 09:50, Vincent Roca <vincent.roca@inria.fr 
>> <mailto:vincent.roca@inria.fr>> a écrit :
>>
>> Hello Rolf,
>>
>>> thanks for the detailed review and sorry for the belated reply. We 
>>> have submitted a new version based on these comments and 
>>> recommendations. Please see inline:
>>
>> You’re welcome.
>>
>>>> 2) Another point: I'd like to see the item (b) of introduction
>>>> developed as this is the key issue with multicast/broadcast traffic.
>>>> Without encryption, application messages are vulnerable to
>>>> eavesdropping and all kinds of analyses. A group key could be
>>>> negociated and used for encrypting this traffic, but this requires a
>>>> more complex setup mechanism (typically a key management system,
>>>> probably with re-keying and all the stuff) and requires a preliminary
>>>> association of a terminal that is not necessarily compatible with the
>>>> application-layer protocol features.
>>>> The text could say that if possible, multicast/broadcast traffic
>>>> encryption should be used, otherwise risks should be minimised as
>>>> discussed in this document. And of course, it's always good to remind
>>>> the designers that unicast traffic should be always encrypted since
>>>> there's no good reason not to do that.
>>>
>>>
>>> We talk about this in the security considerations section and come to 
>>> the same conclusion as you do:
>>>
>>> "It should be noted that certain applications could make use of
>>>   existing mechanisms to protect multicast traffic such as the ones
>>>   defined in [RFC5374].  Examples of such applications can be found in
>>>   Appendix A. of [RFC5374].  Given the required infrastructure and
>>>   assumptions about these applications and the security infrastructure,
>>>   many applications will not be able to make use of such mechanisms."
>>>
>>> In which way would you expand on this?
>>
>> I’d like you extend a little the the bullet (b) of introduction:
>> (b) Encryption is more difficult when broadcast/multicast messages,
>>         leaving content of these messages in the clear and making it
>>         easier to spoof and replay them.
>> It suggests that because it’s difficult, it won’t be used. This is not the
>> message the I-D should carry. It’s difficult (add a reference here), sure,
>> but not impossible. You can also briefly explain why it’s more 
>> difficult with
>> multicast/broadcast.
>>
>>
>>>> 3) I'd like to suggest another recommendation: when applicable, limit
>>>> or avoid user-originated broadcast/multicast messages, preferring
>>>> infrastructure originated messages.
>>>> An example: in a discovery mechanism, avoid terminal sollicitation as
>>>> much as possible and limit oneself to infrastructure announcement
>>>> broadcast messages, even if it can include some extra delay (controled
>>>> with the announcement frequency). This is exactly what happened in
>>>> Wifi AP discovery, where the passive discovery scheme, AP based, is
>>>> now prefered to the active scheme.
>>>> Said differently, multicast/broadcast is not per se the issue, when
>>>> originating from the infrastructure it is generaly safe.
>>>
>>> I think I disagree somewhat (and it is not a generally applicable use 
>>> case, e.g. if resources on a host are offered there is no general way 
>>> to delegate announcements of these to the infrastructure). Saying 
>>> that infrastructure announcements are generally safe requires that a 
>>> receiver can validate that a message came from the infrastructure 
>>> which is a problem (e.g. rogue DHCP servers). A lot of deployments 
>>> solve some of this through infrastructure means (e.g. DHCP snooping), 
>>> but we have documented that. Also, whatever comes from the 
>>> infrastructure requires a standard so that devices/apps understand 
>>> it. We have text around that, too.
>>
>> Let me clarify what I had in mind. A few years ago, discovery of a 
>> known WiFi AP
>> from a device was accelerated through the use of an active mechanism, 
>> with the
>> device sending probes to potentially detects those know WiFi APs. That was
>> awful from a privacy point of view as highlighted by researchers. The 
>> trend was to
>> move to a passive approach, relying mostly on AP announcements (in 
>> addition to
>> MAC address randomisation). The privacy benefits while doing so are 
>> terrible.
>> See e.g., my colleague Mathieu publication on the topic: 
>> https://hal.inria.fr/hal-00747825
>> This is perfectly in line with your  I-D. How privacy can be 
>> compromised by using
>> a broadcast based protocol.
>>
>> Having said that, I agree with you that rogue announcements raise 
>> security concerns
>> (but that’s true for any message sent), and it does not work for 
>> resources offered by
>> a host. I agree, this is not a universal approach. I let you judge 
>> whether it makes sense
>> to talk about it or not.
>>
>>
>>>> 4) A more general comment, related to item (a) of intro:
>>>> Broadcast/multicast can simplify user surveillance, I agree. However,
>>>> when I'm looking at all the practicies of companies working in the
>>>> advertising area (in particular A&A companies, sitting between
>>>> smartphone users and advertisers, domain that I know a little bit),
>>>> the techniques deployed are incredibly smart, some of them bypassing
>>>> technical protections set up by the OS manufacturers, others relying
>>>> on hidden technical features. It's impressive how inventive those
>>>> companies can be.
>>>> My point is that even if traffic is 100% unicast, as long as a
>>>> wireless medium is used, anyone wanting to monitor users in order to
>>>> profile them will set up the required hardware/software configuration.
>>>> This is trivial and extremely cheap nowadays (except perhaps for 4G
>>>> connections), and most of the time this is a purely passive
>>>> monitoring. The unicast/multicast/broadcast nature of traffic has no
>>>> importance as long as you are within wireless network range.
>>>
>>>
>>> I think there is little that the IETF can do about that. Also 
>>> "bypassing technical protection" and using "hidden technical 
>>> features" is nothing you can protect against in general and I assume 
>>> is often not by design.
>>
>> I agree and I don’t want to question the importance of this I-D here.
>> But it remains that wireless communications are so easy to monitor.
>>
>>
>>>> *Various:*
>>>> ** the authors use the term "host name" to refer to a higher layer
>>>> name of a device. To me this term refers to the DNS notion of
>>>> "hostname", i.e. something different, hence confusion. I'd recommend
>>>> to use "device name" in order to avoid it.
>>>
>>> Well, RFC 7719 even admits the term is ill defined and does refer to 
>>> various things. Also, for the protocols we looked at and OS 
>>> configurations, sometimes there are different host namens being used 
>>> for different purposes. We would like to stick with host names (also 
>>> since RFC8117 useses the term which is highly relevant in this context).
>>
>> I was not aware of those RFCs. Do what you believe is the most 
>> appropriate.
>>
>> Cheers,
>>
>>    Vincent
> 


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From: Vincent Roca <vincent.roca@inria.fr>
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Date: Fri, 19 Jan 2018 16:28:00 +0100
Cc: Vincent Roca <vincent.roca@inria.fr>, IESG <iesg@ietf.org>, secdir@ietf.org, draft-ietf-intarea-broadcast-consider.all@ietf.org
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To: Rolf Winter <rolf.winter@hs-augsburg.de>
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Subject: Re: [secdir] Secdir review of draft-ietf-intarea-broadcast-consider-07
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Hi Rolf,

What about:

OLD:

(b)  Encryption is more difficult when broadcast/multicast messages,
        leaving content of these messages in the clear and making it
        easier to spoof and replay them.

NEW:

(b)  Encryption is difficult when broadcast/multicast messages are used,
for instance because a non trivial key management protocol can be =
required.
When encryption is not used, the content of these messages is easily
accessible, making it easier to spoof and replay them.


Cheers,

  Vincent


> Le 19 janv. 2018 =C3=A0 16:20, Rolf Winter =
<rolf.winter@hs-augsburg.de> a =C3=A9crit :
>=20
> Hi Vincent,
>=20
> we have not forgotten about this point. You say about the text that:
>=20
> "It suggests that because it=E2=80=99s difficult, it won=E2=80=99t be =
used. This is not the message the I-D should carry."
>=20
> The reality today is, that it is not used, even for IETF-specified =
protocols it is mostly not specified. We still think about a good way to =
phrase it without making a point about this and then having to admit =
that the IETF itself has failed at doing it, which would be hypocitical.
>=20
> Best,
>=20
> Rolf
>=20
> Am 19.01.18 um 16:10 schrieb Vincent Roca:
>> This is a re-review. My answer below, sent on Jan. 16th,  also =
applies to version -07.
>> Summary: *Almost r**eady*
>> Most of my initial comments have been addressed by the authors.
>> I made a few suggestions/clarifications (below), in addition to my =
initial review.
>> I would insist on implementing the first one, 2), beginning with:
>> "I=E2=80=99d like you extend a little the the bullet (b) of =
introduction: =E2=80=A6 =C2=BB
>> but let the authors judge what they prefer to do for the next ones.
>> Regards,
>>   Vincent
>>> Le 16 janv. 2018 =C3=A0 09:50, Vincent Roca <vincent.roca@inria.fr =
<mailto:vincent.roca@inria.fr>> a =C3=A9crit :
>>>=20
>>> Hello Rolf,
>>>=20
>>>> thanks for the detailed review and sorry for the belated reply. We =
have submitted a new version based on these comments and =
recommendations. Please see inline:
>>>=20
>>> You=E2=80=99re welcome.
>>>=20
>>>>> 2) Another point: I'd like to see the item (b) of introduction
>>>>> developed as this is the key issue with multicast/broadcast =
traffic.
>>>>> Without encryption, application messages are vulnerable to
>>>>> eavesdropping and all kinds of analyses. A group key could be
>>>>> negociated and used for encrypting this traffic, but this requires =
a
>>>>> more complex setup mechanism (typically a key management system,
>>>>> probably with re-keying and all the stuff) and requires a =
preliminary
>>>>> association of a terminal that is not necessarily compatible with =
the
>>>>> application-layer protocol features.
>>>>> The text could say that if possible, multicast/broadcast traffic
>>>>> encryption should be used, otherwise risks should be minimised as
>>>>> discussed in this document. And of course, it's always good to =
remind
>>>>> the designers that unicast traffic should be always encrypted =
since
>>>>> there's no good reason not to do that.
>>>>=20
>>>>=20
>>>> We talk about this in the security considerations section and come =
to the same conclusion as you do:
>>>>=20
>>>> "It should be noted that certain applications could make use of
>>>>   existing mechanisms to protect multicast traffic such as the ones
>>>>   defined in [RFC5374].  Examples of such applications can be found =
in
>>>>   Appendix A. of [RFC5374].  Given the required infrastructure and
>>>>   assumptions about these applications and the security =
infrastructure,
>>>>   many applications will not be able to make use of such =
mechanisms."
>>>>=20
>>>> In which way would you expand on this?
>>>=20
>>> I=E2=80=99d like you extend a little the the bullet (b) of =
introduction:
>>> (b) Encryption is more difficult when broadcast/multicast messages,
>>>         leaving content of these messages in the clear and making it
>>>         easier to spoof and replay them.
>>> It suggests that because it=E2=80=99s difficult, it won=E2=80=99t be =
used. This is not the
>>> message the I-D should carry. It=E2=80=99s difficult (add a =
reference here), sure,
>>> but not impossible. You can also briefly explain why it=E2=80=99s =
more difficult with
>>> multicast/broadcast.
>>>=20
>>>=20
>>>>> 3) I'd like to suggest another recommendation: when applicable, =
limit
>>>>> or avoid user-originated broadcast/multicast messages, preferring
>>>>> infrastructure originated messages.
>>>>> An example: in a discovery mechanism, avoid terminal sollicitation =
as
>>>>> much as possible and limit oneself to infrastructure announcement
>>>>> broadcast messages, even if it can include some extra delay =
(controled
>>>>> with the announcement frequency). This is exactly what happened in
>>>>> Wifi AP discovery, where the passive discovery scheme, AP based, =
is
>>>>> now prefered to the active scheme.
>>>>> Said differently, multicast/broadcast is not per se the issue, =
when
>>>>> originating from the infrastructure it is generaly safe.
>>>>=20
>>>> I think I disagree somewhat (and it is not a generally applicable =
use case, e.g. if resources on a host are offered there is no general =
way to delegate announcements of these to the infrastructure). Saying =
that infrastructure announcements are generally safe requires that a =
receiver can validate that a message came from the infrastructure which =
is a problem (e.g. rogue DHCP servers). A lot of deployments solve some =
of this through infrastructure means (e.g. DHCP snooping), but we have =
documented that. Also, whatever comes from the infrastructure requires a =
standard so that devices/apps understand it. We have text around that, =
too.
>>>=20
>>> Let me clarify what I had in mind. A few years ago, discovery of a =
known WiFi AP
>>> from a device was accelerated through the use of an active =
mechanism, with the
>>> device sending probes to potentially detects those know WiFi APs. =
That was
>>> awful from a privacy point of view as highlighted by researchers. =
The trend was to
>>> move to a passive approach, relying mostly on AP announcements (in =
addition to
>>> MAC address randomisation). The privacy benefits while doing so are =
terrible.
>>> See e.g., my colleague Mathieu publication on the topic: =
https://hal.inria.fr/hal-00747825
>>> This is perfectly in line with your  I-D. How privacy can be =
compromised by using
>>> a broadcast based protocol.
>>>=20
>>> Having said that, I agree with you that rogue announcements raise =
security concerns
>>> (but that=E2=80=99s true for any message sent), and it does not work =
for resources offered by
>>> a host. I agree, this is not a universal approach. I let you judge =
whether it makes sense
>>> to talk about it or not.
>>>=20
>>>=20
>>>>> 4) A more general comment, related to item (a) of intro:
>>>>> Broadcast/multicast can simplify user surveillance, I agree. =
However,
>>>>> when I'm looking at all the practicies of companies working in the
>>>>> advertising area (in particular A&A companies, sitting between
>>>>> smartphone users and advertisers, domain that I know a little =
bit),
>>>>> the techniques deployed are incredibly smart, some of them =
bypassing
>>>>> technical protections set up by the OS manufacturers, others =
relying
>>>>> on hidden technical features. It's impressive how inventive those
>>>>> companies can be.
>>>>> My point is that even if traffic is 100% unicast, as long as a
>>>>> wireless medium is used, anyone wanting to monitor users in order =
to
>>>>> profile them will set up the required hardware/software =
configuration.
>>>>> This is trivial and extremely cheap nowadays (except perhaps for =
4G
>>>>> connections), and most of the time this is a purely passive
>>>>> monitoring. The unicast/multicast/broadcast nature of traffic has =
no
>>>>> importance as long as you are within wireless network range.
>>>>=20
>>>>=20
>>>> I think there is little that the IETF can do about that. Also =
"bypassing technical protection" and using "hidden technical features" =
is nothing you can protect against in general and I assume is often not =
by design.
>>>=20
>>> I agree and I don=E2=80=99t want to question the importance of this =
I-D here.
>>> But it remains that wireless communications are so easy to monitor.
>>>=20
>>>=20
>>>>> *Various:*
>>>>> ** the authors use the term "host name" to refer to a higher layer
>>>>> name of a device. To me this term refers to the DNS notion of
>>>>> "hostname", i.e. something different, hence confusion. I'd =
recommend
>>>>> to use "device name" in order to avoid it.
>>>>=20
>>>> Well, RFC 7719 even admits the term is ill defined and does refer =
to various things. Also, for the protocols we looked at and OS =
configurations, sometimes there are different host namens being used for =
different purposes. We would like to stick with host names (also since =
RFC8117 useses the term which is highly relevant in this context).
>>>=20
>>> I was not aware of those RFCs. Do what you believe is the most =
appropriate.
>>>=20
>>> Cheers,
>>>=20
>>>    Vincent


From nobody Fri Jan 19 07:38:07 2018
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To: Vincent Roca <vincent.roca@inria.fr>
Cc: IESG <iesg@ietf.org>, secdir@ietf.org, draft-ietf-intarea-broadcast-consider.all@ietf.org
References: <383EA7C8-CFF0-48AF-AD0C-840545483E94@inria.fr> <80beb32b-35fe-9a2d-e951-037a34d81a5f@hs-augsburg.de> <50006956-2D5C-49F9-8CA8-ACBEC2B266F1@inria.fr> <1A4312A1-16CA-4BC9-BDEB-FDF0E33CF1FA@inria.fr> <ada774f9-f2d3-938f-5c98-f058074869d6@hs-augsburg.de> <F758BE2D-1DF9-4404-9AE0-56613B32D086@inria.fr>
From: Rolf Winter <rolf.winter@hs-augsburg.de>
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Date: Fri, 19 Jan 2018 16:37:58 +0100
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Subject: Re: [secdir] Secdir review of draft-ietf-intarea-broadcast-consider-07
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Ahh, I though you wanted more than that. A new version with that text 
suggestion has just been upload.

Thanks again,

Rolf

Am 19.01.18 um 16:28 schrieb Vincent Roca:
> Hi Rolf,
> 
> What about:
> 
> OLD:
> 
> (b)  Encryption is more difficult when broadcast/multicast messages,
>          leaving content of these messages in the clear and making it
>          easier to spoof and replay them.
> 
> NEW:
> 
> (b)  Encryption is difficult when broadcast/multicast messages are used,
> for instance because a non trivial key management protocol can be required.
> When encryption is not used, the content of these messages is easily
> accessible, making it easier to spoof and replay them.
> 
> 
> Cheers,
> 
>    Vincent
> 
> 
>> Le 19 janv. 2018 à 16:20, Rolf Winter <rolf.winter@hs-augsburg.de> a écrit :
>>
>> Hi Vincent,
>>
>> we have not forgotten about this point. You say about the text that:
>>
>> "It suggests that because it’s difficult, it won’t be used. This is not the message the I-D should carry."
>>
>> The reality today is, that it is not used, even for IETF-specified protocols it is mostly not specified. We still think about a good way to phrase it without making a point about this and then having to admit that the IETF itself has failed at doing it, which would be hypocitical.
>>
>> Best,
>>
>> Rolf
>>
>> Am 19.01.18 um 16:10 schrieb Vincent Roca:
>>> This is a re-review. My answer below, sent on Jan. 16th,  also applies to version -07.
>>> Summary: *Almost r**eady*
>>> Most of my initial comments have been addressed by the authors.
>>> I made a few suggestions/clarifications (below), in addition to my initial review.
>>> I would insist on implementing the first one, 2), beginning with:
>>> "I’d like you extend a little the the bullet (b) of introduction: … »
>>> but let the authors judge what they prefer to do for the next ones.
>>> Regards,
>>>    Vincent
>>>> Le 16 janv. 2018 à 09:50, Vincent Roca <vincent.roca@inria.fr <mailto:vincent.roca@inria.fr>> a écrit :
>>>>
>>>> Hello Rolf,
>>>>
>>>>> thanks for the detailed review and sorry for the belated reply. We have submitted a new version based on these comments and recommendations. Please see inline:
>>>>
>>>> You’re welcome.
>>>>
>>>>>> 2) Another point: I'd like to see the item (b) of introduction
>>>>>> developed as this is the key issue with multicast/broadcast traffic.
>>>>>> Without encryption, application messages are vulnerable to
>>>>>> eavesdropping and all kinds of analyses. A group key could be
>>>>>> negociated and used for encrypting this traffic, but this requires a
>>>>>> more complex setup mechanism (typically a key management system,
>>>>>> probably with re-keying and all the stuff) and requires a preliminary
>>>>>> association of a terminal that is not necessarily compatible with the
>>>>>> application-layer protocol features.
>>>>>> The text could say that if possible, multicast/broadcast traffic
>>>>>> encryption should be used, otherwise risks should be minimised as
>>>>>> discussed in this document. And of course, it's always good to remind
>>>>>> the designers that unicast traffic should be always encrypted since
>>>>>> there's no good reason not to do that.
>>>>>
>>>>>
>>>>> We talk about this in the security considerations section and come to the same conclusion as you do:
>>>>>
>>>>> "It should be noted that certain applications could make use of
>>>>>    existing mechanisms to protect multicast traffic such as the ones
>>>>>    defined in [RFC5374].  Examples of such applications can be found in
>>>>>    Appendix A. of [RFC5374].  Given the required infrastructure and
>>>>>    assumptions about these applications and the security infrastructure,
>>>>>    many applications will not be able to make use of such mechanisms."
>>>>>
>>>>> In which way would you expand on this?
>>>>
>>>> I’d like you extend a little the the bullet (b) of introduction:
>>>> (b) Encryption is more difficult when broadcast/multicast messages,
>>>>          leaving content of these messages in the clear and making it
>>>>          easier to spoof and replay them.
>>>> It suggests that because it’s difficult, it won’t be used. This is not the
>>>> message the I-D should carry. It’s difficult (add a reference here), sure,
>>>> but not impossible. You can also briefly explain why it’s more difficult with
>>>> multicast/broadcast.
>>>>
>>>>
>>>>>> 3) I'd like to suggest another recommendation: when applicable, limit
>>>>>> or avoid user-originated broadcast/multicast messages, preferring
>>>>>> infrastructure originated messages.
>>>>>> An example: in a discovery mechanism, avoid terminal sollicitation as
>>>>>> much as possible and limit oneself to infrastructure announcement
>>>>>> broadcast messages, even if it can include some extra delay (controled
>>>>>> with the announcement frequency). This is exactly what happened in
>>>>>> Wifi AP discovery, where the passive discovery scheme, AP based, is
>>>>>> now prefered to the active scheme.
>>>>>> Said differently, multicast/broadcast is not per se the issue, when
>>>>>> originating from the infrastructure it is generaly safe.
>>>>>
>>>>> I think I disagree somewhat (and it is not a generally applicable use case, e.g. if resources on a host are offered there is no general way to delegate announcements of these to the infrastructure). Saying that infrastructure announcements are generally safe requires that a receiver can validate that a message came from the infrastructure which is a problem (e.g. rogue DHCP servers). A lot of deployments solve some of this through infrastructure means (e.g. DHCP snooping), but we have documented that. Also, whatever comes from the infrastructure requires a standard so that devices/apps understand it. We have text around that, too.
>>>>
>>>> Let me clarify what I had in mind. A few years ago, discovery of a known WiFi AP
>>>> from a device was accelerated through the use of an active mechanism, with the
>>>> device sending probes to potentially detects those know WiFi APs. That was
>>>> awful from a privacy point of view as highlighted by researchers. The trend was to
>>>> move to a passive approach, relying mostly on AP announcements (in addition to
>>>> MAC address randomisation). The privacy benefits while doing so are terrible.
>>>> See e.g., my colleague Mathieu publication on the topic: https://hal.inria.fr/hal-00747825
>>>> This is perfectly in line with your  I-D. How privacy can be compromised by using
>>>> a broadcast based protocol.
>>>>
>>>> Having said that, I agree with you that rogue announcements raise security concerns
>>>> (but that’s true for any message sent), and it does not work for resources offered by
>>>> a host. I agree, this is not a universal approach. I let you judge whether it makes sense
>>>> to talk about it or not.
>>>>
>>>>
>>>>>> 4) A more general comment, related to item (a) of intro:
>>>>>> Broadcast/multicast can simplify user surveillance, I agree. However,
>>>>>> when I'm looking at all the practicies of companies working in the
>>>>>> advertising area (in particular A&A companies, sitting between
>>>>>> smartphone users and advertisers, domain that I know a little bit),
>>>>>> the techniques deployed are incredibly smart, some of them bypassing
>>>>>> technical protections set up by the OS manufacturers, others relying
>>>>>> on hidden technical features. It's impressive how inventive those
>>>>>> companies can be.
>>>>>> My point is that even if traffic is 100% unicast, as long as a
>>>>>> wireless medium is used, anyone wanting to monitor users in order to
>>>>>> profile them will set up the required hardware/software configuration.
>>>>>> This is trivial and extremely cheap nowadays (except perhaps for 4G
>>>>>> connections), and most of the time this is a purely passive
>>>>>> monitoring. The unicast/multicast/broadcast nature of traffic has no
>>>>>> importance as long as you are within wireless network range.
>>>>>
>>>>>
>>>>> I think there is little that the IETF can do about that. Also "bypassing technical protection" and using "hidden technical features" is nothing you can protect against in general and I assume is often not by design.
>>>>
>>>> I agree and I don’t want to question the importance of this I-D here.
>>>> But it remains that wireless communications are so easy to monitor.
>>>>
>>>>
>>>>>> *Various:*
>>>>>> ** the authors use the term "host name" to refer to a higher layer
>>>>>> name of a device. To me this term refers to the DNS notion of
>>>>>> "hostname", i.e. something different, hence confusion. I'd recommend
>>>>>> to use "device name" in order to avoid it.
>>>>>
>>>>> Well, RFC 7719 even admits the term is ill defined and does refer to various things. Also, for the protocols we looked at and OS configurations, sometimes there are different host namens being used for different purposes. We would like to stick with host names (also since RFC8117 useses the term which is highly relevant in this context).
>>>>
>>>> I was not aware of those RFCs. Do what you believe is the most appropriate.
>>>>
>>>> Cheers,
>>>>
>>>>     Vincent
> 


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Cc: Vincent Roca <vincent.roca@inria.fr>, IESG <iesg@ietf.org>, secdir@ietf.org, draft-ietf-intarea-broadcast-consider.all@ietf.org
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To: Rolf Winter <rolf.winter@hs-augsburg.de>
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Subject: Re: [secdir] Secdir review of draft-ietf-intarea-broadcast-consider-07
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Thanks Rolf. Version -08 answers my main comments then.
Cheers,

  Vincent


> Le 19 janv. 2018 =C3=A0 16:37, Rolf Winter =
<rolf.winter@hs-augsburg.de> a =C3=A9crit :
>=20
> Ahh, I though you wanted more than that. A new version with that text =
suggestion has just been upload.
>=20
> Thanks again,
>=20
> Rolf
>=20
> Am 19.01.18 um 16:28 schrieb Vincent Roca:
>> Hi Rolf,
>> What about:
>> OLD:
>> (b)  Encryption is more difficult when broadcast/multicast messages,
>>         leaving content of these messages in the clear and making it
>>         easier to spoof and replay them.
>> NEW:
>> (b)  Encryption is difficult when broadcast/multicast messages are =
used,
>> for instance because a non trivial key management protocol can be =
required.
>> When encryption is not used, the content of these messages is easily
>> accessible, making it easier to spoof and replay them.
>> Cheers,
>>   Vincent
>>> Le 19 janv. 2018 =C3=A0 16:20, Rolf Winter =
<rolf.winter@hs-augsburg.de> a =C3=A9crit :
>>>=20
>>> Hi Vincent,
>>>=20
>>> we have not forgotten about this point. You say about the text that:
>>>=20
>>> "It suggests that because it=E2=80=99s difficult, it won=E2=80=99t =
be used. This is not the message the I-D should carry."
>>>=20
>>> The reality today is, that it is not used, even for IETF-specified =
protocols it is mostly not specified. We still think about a good way to =
phrase it without making a point about this and then having to admit =
that the IETF itself has failed at doing it, which would be hypocitical.
>>>=20
>>> Best,
>>>=20
>>> Rolf
>>>=20
>>> Am 19.01.18 um 16:10 schrieb Vincent Roca:
>>>> This is a re-review. My answer below, sent on Jan. 16th,  also =
applies to version -07.
>>>> Summary: *Almost r**eady*
>>>> Most of my initial comments have been addressed by the authors.
>>>> I made a few suggestions/clarifications (below), in addition to my =
initial review.
>>>> I would insist on implementing the first one, 2), beginning with:
>>>> "I=E2=80=99d like you extend a little the the bullet (b) of =
introduction: =E2=80=A6 =C2=BB
>>>> but let the authors judge what they prefer to do for the next ones.
>>>> Regards,
>>>>   Vincent
>>>>> Le 16 janv. 2018 =C3=A0 09:50, Vincent Roca <vincent.roca@inria.fr =
<mailto:vincent.roca@inria.fr>> a =C3=A9crit :
>>>>>=20
>>>>> Hello Rolf,
>>>>>=20
>>>>>> thanks for the detailed review and sorry for the belated reply. =
We have submitted a new version based on these comments and =
recommendations. Please see inline:
>>>>>=20
>>>>> You=E2=80=99re welcome.
>>>>>=20
>>>>>>> 2) Another point: I'd like to see the item (b) of introduction
>>>>>>> developed as this is the key issue with multicast/broadcast =
traffic.
>>>>>>> Without encryption, application messages are vulnerable to
>>>>>>> eavesdropping and all kinds of analyses. A group key could be
>>>>>>> negociated and used for encrypting this traffic, but this =
requires a
>>>>>>> more complex setup mechanism (typically a key management system,
>>>>>>> probably with re-keying and all the stuff) and requires a =
preliminary
>>>>>>> association of a terminal that is not necessarily compatible =
with the
>>>>>>> application-layer protocol features.
>>>>>>> The text could say that if possible, multicast/broadcast traffic
>>>>>>> encryption should be used, otherwise risks should be minimised =
as
>>>>>>> discussed in this document. And of course, it's always good to =
remind
>>>>>>> the designers that unicast traffic should be always encrypted =
since
>>>>>>> there's no good reason not to do that.
>>>>>>=20
>>>>>>=20
>>>>>> We talk about this in the security considerations section and =
come to the same conclusion as you do:
>>>>>>=20
>>>>>> "It should be noted that certain applications could make use of
>>>>>>   existing mechanisms to protect multicast traffic such as the =
ones
>>>>>>   defined in [RFC5374].  Examples of such applications can be =
found in
>>>>>>   Appendix A. of [RFC5374].  Given the required infrastructure =
and
>>>>>>   assumptions about these applications and the security =
infrastructure,
>>>>>>   many applications will not be able to make use of such =
mechanisms."
>>>>>>=20
>>>>>> In which way would you expand on this?
>>>>>=20
>>>>> I=E2=80=99d like you extend a little the the bullet (b) of =
introduction:
>>>>> (b) Encryption is more difficult when broadcast/multicast =
messages,
>>>>>         leaving content of these messages in the clear and making =
it
>>>>>         easier to spoof and replay them.
>>>>> It suggests that because it=E2=80=99s difficult, it won=E2=80=99t =
be used. This is not the
>>>>> message the I-D should carry. It=E2=80=99s difficult (add a =
reference here), sure,
>>>>> but not impossible. You can also briefly explain why it=E2=80=99s =
more difficult with
>>>>> multicast/broadcast.
>>>>>=20
>>>>>=20
>>>>>>> 3) I'd like to suggest another recommendation: when applicable, =
limit
>>>>>>> or avoid user-originated broadcast/multicast messages, =
preferring
>>>>>>> infrastructure originated messages.
>>>>>>> An example: in a discovery mechanism, avoid terminal =
sollicitation as
>>>>>>> much as possible and limit oneself to infrastructure =
announcement
>>>>>>> broadcast messages, even if it can include some extra delay =
(controled
>>>>>>> with the announcement frequency). This is exactly what happened =
in
>>>>>>> Wifi AP discovery, where the passive discovery scheme, AP based, =
is
>>>>>>> now prefered to the active scheme.
>>>>>>> Said differently, multicast/broadcast is not per se the issue, =
when
>>>>>>> originating from the infrastructure it is generaly safe.
>>>>>>=20
>>>>>> I think I disagree somewhat (and it is not a generally applicable =
use case, e.g. if resources on a host are offered there is no general =
way to delegate announcements of these to the infrastructure). Saying =
that infrastructure announcements are generally safe requires that a =
receiver can validate that a message came from the infrastructure which =
is a problem (e.g. rogue DHCP servers). A lot of deployments solve some =
of this through infrastructure means (e.g. DHCP snooping), but we have =
documented that. Also, whatever comes from the infrastructure requires a =
standard so that devices/apps understand it. We have text around that, =
too.
>>>>>=20
>>>>> Let me clarify what I had in mind. A few years ago, discovery of a =
known WiFi AP
>>>>> from a device was accelerated through the use of an active =
mechanism, with the
>>>>> device sending probes to potentially detects those know WiFi APs. =
That was
>>>>> awful from a privacy point of view as highlighted by researchers. =
The trend was to
>>>>> move to a passive approach, relying mostly on AP announcements (in =
addition to
>>>>> MAC address randomisation). The privacy benefits while doing so =
are terrible.
>>>>> See e.g., my colleague Mathieu publication on the topic: =
https://hal.inria.fr/hal-00747825
>>>>> This is perfectly in line with your  I-D. How privacy can be =
compromised by using
>>>>> a broadcast based protocol.
>>>>>=20
>>>>> Having said that, I agree with you that rogue announcements raise =
security concerns
>>>>> (but that=E2=80=99s true for any message sent), and it does not =
work for resources offered by
>>>>> a host. I agree, this is not a universal approach. I let you judge =
whether it makes sense
>>>>> to talk about it or not.
>>>>>=20
>>>>>=20
>>>>>>> 4) A more general comment, related to item (a) of intro:
>>>>>>> Broadcast/multicast can simplify user surveillance, I agree. =
However,
>>>>>>> when I'm looking at all the practicies of companies working in =
the
>>>>>>> advertising area (in particular A&A companies, sitting between
>>>>>>> smartphone users and advertisers, domain that I know a little =
bit),
>>>>>>> the techniques deployed are incredibly smart, some of them =
bypassing
>>>>>>> technical protections set up by the OS manufacturers, others =
relying
>>>>>>> on hidden technical features. It's impressive how inventive =
those
>>>>>>> companies can be.
>>>>>>> My point is that even if traffic is 100% unicast, as long as a
>>>>>>> wireless medium is used, anyone wanting to monitor users in =
order to
>>>>>>> profile them will set up the required hardware/software =
configuration.
>>>>>>> This is trivial and extremely cheap nowadays (except perhaps for =
4G
>>>>>>> connections), and most of the time this is a purely passive
>>>>>>> monitoring. The unicast/multicast/broadcast nature of traffic =
has no
>>>>>>> importance as long as you are within wireless network range.
>>>>>>=20
>>>>>>=20
>>>>>> I think there is little that the IETF can do about that. Also =
"bypassing technical protection" and using "hidden technical features" =
is nothing you can protect against in general and I assume is often not =
by design.
>>>>>=20
>>>>> I agree and I don=E2=80=99t want to question the importance of =
this I-D here.
>>>>> But it remains that wireless communications are so easy to =
monitor.
>>>>>=20
>>>>>=20
>>>>>>> *Various:*
>>>>>>> ** the authors use the term "host name" to refer to a higher =
layer
>>>>>>> name of a device. To me this term refers to the DNS notion of
>>>>>>> "hostname", i.e. something different, hence confusion. I'd =
recommend
>>>>>>> to use "device name" in order to avoid it.
>>>>>>=20
>>>>>> Well, RFC 7719 even admits the term is ill defined and does refer =
to various things. Also, for the protocols we looked at and OS =
configurations, sometimes there are different host namens being used for =
different purposes. We would like to stick with host names (also since =
RFC8117 useses the term which is highly relevant in this context).
>>>>>=20
>>>>> I was not aware of those RFCs. Do what you believe is the most =
appropriate.
>>>>>=20
>>>>> Cheers,
>>>>>=20
>>>>>    Vincent


From nobody Mon Jan 22 09:25:33 2018
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From: Kyle Rose <krose@krose.org>
Date: Mon, 22 Jan 2018 12:25:17 -0500
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To: "Bernie Volz (volz)" <volz@cisco.com>
Cc: The IESG <iesg@ietf.org>, "secdir@ietf.org" <secdir@ietf.org>,  "draft-ietf-dhc-rfc3315bis.all@ietf.org" <draft-ietf-dhc-rfc3315bis.all@ietf.org>
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Subject: Re: [secdir] Secdir last call review of draft-ietf-dhc-rfc3315bis-10
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On Fri, Jan 19, 2018 at 9:53 AM, Bernie Volz (volz) <volz@cisco.com> wrote:

> On behalf of the authors of draft-ietf-dhc-rfc3315bis, thanks much for th=
e
> very thorough review (this email and your other email with the nits =E2=
=80=93 most
> of those nits look appropriate to apply).
>

My pleasure. I hope the feedback was helpful.


> Regarding the HMAC-MD5 issue: That was what RFC 3315 specified. Also, the
> AUTH Option (except for use by RKAP) is being deprecated. For RKAP, there
> is also a flaw as there is no means for the client to indicate the
> algorithms it supports and the server generates this key =E2=80=93 so wha=
t it uses
> must be supported by the client for it to work. Therefore, simply changin=
g
> algorithms is not very really possible (likely it would require a NEW
> option to have the client communicate which algorithm(s) it supports).
>
>
Understood. I personally feel that this is not a problem, for three reasons=
:

(1) It's documentation of an existing practice, not a new use of MD5.
(2) AFAIK HMAC-MD5 has not actually been broken.
(3) The protected resource's attack surface has much weaker points in the
real world than attacking the crypto.

That said, I raised it because normatively specifying MD5 in a standard may
not be appropriate for a standard published in 2018. However, going back
through the text right now, it appears to already be worded less as a
normative specification than as an informational description of "this is
how you interoperate with existing deployments", which I think is entirely
appropriate for a proposed standard with legacy components.

It may still be worthwhile to separately pursue a replacement for RKAP that
incorporates algorithmic agility.

Kyle

--001a1145ea1cc8d3d3056360b6aa
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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote">On F=
ri, Jan 19, 2018 at 9:53 AM, Bernie Volz (volz) <span dir=3D"ltr">&lt;<a hr=
ef=3D"mailto:volz@cisco.com" target=3D"_blank">volz@cisco.com</a>&gt;</span=
> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex">





<div link=3D"#0563C1" vlink=3D"#954F72" lang=3D"EN-US">
<div class=3D"m_-1503743319392392059WordSection1"><span style=3D"font-size:=
11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">On behalf =
of the authors of draft-ietf-dhc-rfc3315bis, thanks much for the very thoro=
ugh review (this email and your other email with the nits =E2=80=93 most of=
 those
 nits look appropriate to apply).</span></div></div></blockquote><div><br><=
/div><div>My pleasure. I hope the feedback was helpful.<br></div><div>=C2=
=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;borde=
r-left:1px #ccc solid;padding-left:1ex"><div link=3D"#0563C1" vlink=3D"#954=
F72" lang=3D"EN-US"><div class=3D"m_-1503743319392392059WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Regarding the HMAC-MD5 issue: That wa=
s what RFC 3315 specified. Also, the AUTH Option (except for use by RKAP) i=
s being deprecated. For RKAP, there is also a
 flaw as there is no means for the client to indicate the algorithms it sup=
ports and the server generates this key =E2=80=93 so what it uses must be s=
upported by the client for it to work. Therefore, simply changing algorithm=
s is not very really possible (likely it
 would require a NEW option to have the client communicate which algorithm(=
s) it supports).</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"></span></p></div></div></blockquote><=
div>=C2=A0</div><div>Understood. I personally feel that this is not a probl=
em, for three reasons:</div><div><br></div><div>(1) It&#39;s documentation =
of an existing practice, not a new use of MD5.<br></div><div>(2) AFAIK HMAC=
-MD5 has not actually been broken.</div><div>(3) The protected resource&#39=
;s attack surface has much weaker points in the real world than attacking t=
he crypto.</div><div><br></div><div>That said, I raised it because normativ=
ely specifying MD5 in a standard may not be appropriate for a standard publ=
ished in 2018. However, going back through the text right now, it appears t=
o already be worded less as a normative specification than as an informatio=
nal description of &quot;this is how you interoperate with existing deploym=
ents&quot;, which I think is entirely appropriate for a proposed standard w=
ith legacy components.</div><div><br></div><div>It may still be worthwhile =
to separately pursue a replacement for RKAP that incorporates algorithmic a=
gility.<br></div><div><br></div><div>Kyle<br></div><div><br></div></div></d=
iv></div>

--001a1145ea1cc8d3d3056360b6aa--


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Date: Mon, 22 Jan 2018 14:00:49 -0500
From: Carl Wallace <carl@redhoundsoftware.com>
To: <draft-ietf-netmod-rfc8022bis.all@ietf.org>
CC: <secdir@ietf.org>, <iesg@ietf.org>
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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.

I found no issues with the draft. The security considerations section
references NETCONF and RESTCONF for network security, with SSH and TLS
used. This seems fine but I wonder if some guidance on using these a la
RFC6125 would be helpful for some. One question in the security
consideration section. Twice "/routing/ribs/rib" is referred to a list.
Should this be "/routing/ribs"?



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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Carl Wallace <carl@redhoundsoftware.com>, "draft-ietf-netmod-rfc8022bis.all@ietf.org" <draft-ietf-netmod-rfc8022bis.all@ietf.org>
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Carl Wallace <carl@redhoundsoftware.com>, "draft-ietf-netmod-rfc8022bis.all@ietf.org" <draft-ietf-netmod-rfc8022bis.all@ietf.org>
CC: "secdir@ietf.org" <secdir@ietf.org>, "iesg@ietf.org" <iesg@ietf.org>
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From: Shawn Emery <shawn.emery@gmail.com>
Date: Mon, 22 Jan 2018 17:56:25 -0700
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Subject: [secdir] Review of draft-ietf-mmusic-trickle-ice-sip-12
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--94eb2c05ae482ac9e50563670410
Content-Type: text/plain; charset="UTF-8"

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 draft specifies how the Session Initiation Protocol (SIP) can use the
non-blocking version of the Interactive Connectivity Establishment (ICE)
protocol,
Trickle ICE, and defines a new registry for this usage.

The security considerations section does exist and defers security concerns
to
draft-ietf-mmusic-ice-sip-sdp, RFC 6086, and draft-ietf-ice-trickle.

1. draft-ietf-mmusic-ice-sip-sdp
This will hopefully be available for a secdir review in the near future,
see general
comments concern below.
2. RFC 6086
6086 prescribes S/MIME if the environment requires payloads to be private
and
also suggests a digest-challenge in order to provide integrity protection.
3. draft-ietf-ice-trickle
defers to draft-ietf-ice-rfc5245bis.  ice-sip should reference the 5245bis
draft
directly.  I won't duplicate Stephen's efforts in reviewing 5245bis.

General comments:

I'm concerned about the normative references to ietf-mmusic-ice-sip-sdp.
This draft should progress before or along with any dependents.

Editorial comments:

Some of the abbreviations that are not expanded and are not listed as well
known by the RFC Editor:

SDP
AOR
STUN
TURN
GRUU (needs to be expanded in Section 3.1)

making it cumbersome to follow the specification.

Shawn.
--

--94eb2c05ae482ac9e50563670410
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><span style=3D"font-size:12.8px">I have reviewed this docu=
ment as part of the security directorate&#39;s</span><br style=3D"font-size=
:12.8px"><span style=3D"font-size:12.8px">ongoing effort to review all=C2=
=A0<span class=3D"gmail-m_773398563878481139m_-695948085225974410gmail-m_16=
23746472089625057gmail-m_-8618428600954061146gmail-m_7708740057377588207m_-=
5546242983760954135gmail-m_4457086233820409101gmail-m_4728537460569717949m_=
1367315294398481242gmail-il">IETF</span>=C2=A0documents being processed by =
the IESG.</span><br style=3D"font-size:12.8px"><span style=3D"font-size:12.=
8px">These comments were written primarily for the benefit of the security<=
/span><br style=3D"font-size:12.8px"><span style=3D"font-size:12.8px">area =
directors. Document editors and WG chairs should treat these</span><br styl=
e=3D"font-size:12.8px"><span style=3D"font-size:12.8px">comments just like =
any other last call comments.</span><br style=3D"font-size:12.8px"><div sty=
le=3D"font-size:12.8px"><span style=3D"font-size:12.8px"><br></span></div><=
div><div style=3D"font-size:12.8px">This draft specifies how the Session In=
itiation Protocol (SIP) can use the</div><div style=3D"font-size:12.8px">no=
n-blocking version of the Interactive=C2=A0<span style=3D"font-size:12.8px"=
>Connectivity Establishment (ICE) protocol,</span></div><div style=3D"font-=
size:12.8px"><span style=3D"font-size:12.8px">Trickle ICE, and defines a ne=
w registry for this usage.</span></div><div style=3D"font-size:12.8px"><br>=
</div><div style=3D"font-size:12.8px">The security considerations section d=
oes exist and defers security concerns to</div><div style=3D"font-size:12.8=
px">draft-ietf-mmusic-ice-sip-sdp, RFC 6086, and draft-ietf-ice-trickle.</d=
iv><div style=3D"font-size:12.8px"><br></div><div style=3D"font-size:12.8px=
">1.=C2=A0<span style=3D"font-size:12.8px">draft-ietf-mmusic-ice-sip-sdp</s=
pan></div><div style=3D"font-size:12.8px"><span style=3D"font-size:12.8px">=
This will hopefully be available for a secdir review in the near future, se=
e general</span></div><div style=3D"font-size:12.8px"><span style=3D"font-s=
ize:12.8px">comments concern below.</span></div><div style=3D"font-size:12.=
8px"><span style=3D"font-size:12.8px">2. RFC 6086</span></div><div style=3D=
"font-size:12.8px"><span style=3D"font-size:12.8px">6086 prescribes S/MIME =
if the environment requires payloads to be private and</span></div><div sty=
le=3D"font-size:12.8px"><span style=3D"font-size:12.8px">also suggests a di=
gest-challenge in order to provide integrity protection.</span></div><div s=
tyle=3D"font-size:12.8px">3. draft-ietf-ice-trickle</div><div style=3D"font=
-size:12.8px">defers to draft-ietf-ice-rfc5245bis.=C2=A0 ice-sip should ref=
erence the 5245bis draft</div><div style=3D"font-size:12.8px"><span style=
=3D"font-size:12.8px">directly.=C2=A0 I won&#39;t duplicate Stephen&#39;s e=
fforts in reviewing 5245bis.</span></div><div style=3D"font-size:12.8px"><b=
r></div><div style=3D"font-size:12.8px">General comments:</div><div style=
=3D"font-size:12.8px"><br></div><div style=3D"font-size:12.8px">I&#39;m con=
cerned about the normative references to ietf-mmusic-ice-sip-sdp.</div><div=
 style=3D"font-size:12.8px">This draft should progress before or along with=
 any dependents.</div><div style=3D"font-size:12.8px"><br></div><div style=
=3D"font-size:12.8px">Editorial comments:</div><div style=3D"font-size:12.8=
px"><span style=3D"color:rgb(0,0,0);font-size:13.3333px"><br></span></div><=
div><font color=3D"#000000"><span style=3D"font-size:13.3333px">Some of the=
 abbreviations that are not expanded and are not listed as well</span></fon=
t></div><div><font color=3D"#000000"><span style=3D"font-size:13.3333px">kn=
own by the RFC Editor:</span></font></div><div><font color=3D"#000000"><spa=
n style=3D"font-size:13.3333px"><br></span></font></div><div><font color=3D=
"#000000"><span style=3D"font-size:13.3333px">SDP</span></font></div><div><=
font color=3D"#000000"><span style=3D"font-size:13.3333px">AOR</span></font=
></div><div><font color=3D"#000000"><span style=3D"font-size:13.3333px">STU=
N</span></font></div><div><font color=3D"#000000"><span style=3D"font-size:=
13.3333px">TURN<br></span></font></div><div><font color=3D"#000000"><span s=
tyle=3D"font-size:13.3333px">GRUU (needs to be expanded in Section 3.1)</sp=
an></font></div><div><font color=3D"#000000"><span style=3D"font-size:13.33=
33px"><br></span></font></div><div><font color=3D"#000000"><span style=3D"f=
ont-size:13.3333px">making it cumbersome to follow the specification.</span=
></font></div><div><font color=3D"#000000"><span style=3D"font-size:13.3333=
px"><br></span></font></div><div style=3D"font-size:12.8px"><font color=3D"=
#000000"><span style=3D"font-size:13.3333px">Shawn.</span></font></div><div=
 style=3D"font-size:12.8px"><font color=3D"#000000"><span style=3D"font-siz=
e:13.3333px">--</span></font></div></div></div>

--94eb2c05ae482ac9e50563670410--


From nobody Mon Jan 22 19:41:04 2018
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From: Paul Wouters <paul@nohats.ca>
To: <secdir@ietf.org>
Cc: lp-wan@ietf.org, draft-ietf-lpwan-overview.all@ietf.org, ietf@ietf.org
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Subject: [secdir] Secdir last call review of draft-ietf-lpwan-overview-07
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Reviewer: Paul Wouters
Review result: Ready

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.

The summary of the review is that the document is Ready.

This document is an overview of existing Low Power Wide Area Networks (LPWAN)
technologies. As the review states, no LPWAN devices have IP capabilities at
the moment. It also describes a lot of standards in this area are coming from
outside the IETF.

Nevertheless, a Security Section is included that lists a few of the items of
concern, and how some existing IETF security technologies might not work on
LPWAN.


From nobody Thu Jan 25 10:06:14 2018
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Review instructions and related resources are at:
http://tools.ietf.org/area/sec/trac/wiki/SecDirReview

For telechat 2018-01-25

Reviewer               LC end     Draft
Tim Polk               2018-01-16 draft-ietf-lwig-energy-efficient-08
Paul Wouters           2018-01-11 draft-ietf-ospf-ospfv3-lsa-extend-23

For telechat 2018-02-08

Reviewer               LC end     Draft
Derek Atkins           2018-01-31 draft-ietf-bier-mvpn-09
Donald Eastlake        2018-01-31 draft-farrel-sfc-convent-05
Ólafur Guðmundsson     2018-02-07 draft-ietf-tls-dnssec-chain-extension-06
Phillip Hallam-Baker   2018-02-07 draft-ietf-netmod-yang-tree-diagrams-05
Steve Hanna            2018-02-05 draft-ietf-trill-ecn-support-04
Dan Harkins            2018-02-05 draft-ietf-trill-address-flush-05
Brian Weis            R2018-01-26 draft-ietf-idr-bgp-prefix-sid-10
Taylor Yu              2018-01-31 draft-ietf-rtgwg-lne-model-05
Dacheng Zhang          2018-01-31 draft-ietf-mtgvenue-iaoc-venue-selection-process-11

For telechat 2018-02-22

Reviewer               LC end     Draft
Tobias Gondrom         None       draft-ietf-sacm-nea-swima-patnc-01

For telechat 2018-03-08

Reviewer               LC end     Draft
Daniel Gillmor         None       draft-gutmann-scep-08

Last calls:

Reviewer               LC end     Draft
John Bradley           None       draft-ietf-acme-acme-09
Stephen Farrell        2018-01-26 draft-ietf-ice-rfc5245bis-16
Paul Hoffman           2018-02-02 draft-ietf-bmwg-sdn-controller-benchmark-term-07
Russ Housley           2018-02-02 draft-ietf-bmwg-sdn-controller-benchmark-meth-07
Christian Huitema      None       draft-ietf-bfd-yang-09
Russ Mundy             2017-09-14 draft-spinosa-urn-lex-12

Early review requests:

Reviewer               Due        Draft
Daniel Franke          2018-01-31 draft-ietf-intarea-provisioning-domains-00
Ólafur Guðmundsson     2018-01-09 draft-ietf-opsawg-nat-yang-09

Next in the reviewer rotation:

  Leif Johansson
  Benjamin Kaduk
  Charlie Kaufman
  Scott Kelly
  Stephen Kent
  Tero Kivinen
  Watson Ladd
  Ben Laurie
  Barry Leiba
  Chris Lonvick


From nobody Thu Jan 25 10:44:58 2018
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From: "Brian Weis (bew)" <bew@cisco.com>
To: Thomas Haynes <loghyr@primarydata.com>
CC: "secdir@ietf.org" <secdir@ietf.org>, NFSv4 <nfsv4@ietf.org>, "draft-ietf-nfsv4-flex-files.all@ietf.org" <draft-ietf-nfsv4-flex-files.all@ietf.org>
Thread-Topic: [nfsv4] Secdir last call review of draft-ietf-nfsv4-flex-files-15
Thread-Index: AQHTi9WQTx5RarnLbUyAVOTsrpXN+aNwovgAgACajgCABaIqgIAOdZ0A
Date: Thu, 25 Jan 2018 18:44:48 +0000
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Subject: Re: [secdir] [nfsv4] Secdir last call review of draft-ietf-nfsv4-flex-files-15
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--_000_B541D533FCBA45B08C3576A9FA320074ciscocom_--


From nobody Thu Jan 25 12:36:28 2018
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From: Phillip Hallam-Baker <hallam@gmail.com>
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Date: Thu, 25 Jan 2018 12:35:55 -0800
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Subject: [secdir] Secdir telechat review of draft-ietf-netmod-yang-tree-diagrams-05
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Reviewer: Phillip Hallam-Baker
Review result: Has Nits

I have reviewed the document and it is generally free of security
considerations as claimed. There are some areas of concern however, the
significance of which may become more apparent as such tools find future use.

As described in the document, the tree diagram format is intended to serve as
an output generated by a tool to aid human interpretation. Thus, a potential
ambiguity can arise if the tool used to generate the format is buggy or if the
document contains schema and presentation data compiled from different versions
of the source.

Specifications using this representation need to make clear which
representation is canonical. Otherwise we end up in a situation in which a
document that has an ambiguity being unfixable by means of issuing an errata
because there is no agreement as to whether the change is breaking or not.

Another issue that is of concern is that even though the format is not intended
to be an input format, there can be no guarantee it will not be used as such.
Indeed it could be argued that a spec that makes use of this format should
encourage this approach so as to detect possible ambiguities.


From nobody Thu Jan 25 15:51:00 2018
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Subject: Re: [secdir] [nfsv4] Secdir last call review of draft-ietf-nfsv4-flex-files-15
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From nobody Thu Jan 25 18:36:52 2018
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From: "Paul Hoffman" <paul.hoffman@vpnc.org>
To: secdir <secdir@ietf.org>
Date: Thu, 25 Jan 2018 18:36:44 -0800
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Subject: [secdir] Secdir review of draft-ietf-bmwg-sdn-controller-benchmark-term
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This is a benchmarking terminology document that extends the terminology 
already in RFC 7426. The document, correctly, says "Security issues are 
not discussed in this memo". It's just a small extension for a 
benchmarking protocol.

--Paul Hoffman


From nobody Fri Jan 26 08:49:11 2018
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Reviewer: Stephen Farrell
Review result: Has Issues


(1) I think a bit more work on the security and privacy issues around
ICE would improve the document, and hopefully, ICE implementations.

- There has been (IMO somewhat justified) concern [1] about exposing
all possible addresses, for example where one is from a VPN intended
to preserve privacy, say if a user is aiming to circumvent local
censorship or surveillance.  5.1.1.1 has a SHOULD that, as I read it,
says to always include such addresses.  

   [1] https://www.w3.org/wiki/Privacy/IPAddresses

(Note: I'm not claiming [1] is authoritative, it's just a page I found
that describes the issue reasonably well.)

There is a bit of text about this (1st para in section 19), but IMO
it's a bit weak. 

- Did the WG consider REQUIRING or RECOMMENDING agent implementations
  provide some local interface that allows the host or an application
to say "Don't use <this> interface to generate any candidates until I
tell you otherwise"?  That might be better than having VPN operators
recommending to turn off WebRTC entirely for example. (Note: this is
my main comment, the rest are mostly suggested things to think about,
if you've not already.)

- Even if the text isn't changed, a reference to [2] would I think be
  useful. (Assuming [2] is still being worked on in rtcweb, though
mind you, I don't like how [2] refers to "consent" as I doubt a random
person can really provide meaningful consent for things like this.)

   [2] https://tools.ietf.org/html/draft-ietf-rtcweb-ip-handling-04

- Separately [1] also describes another potential privacy issue with
  STUN urls. I think it'd be worthwhile noting such issues that have
been found with deployments of ICE here, as any protocol using ICE and
accepting non locally configured STUN/TURN URLs may have issues like
that. For example, a recent paper [3] also describes some attacks (in
section 4.2 mostly) that could (I guess) be mounted against any ICE
agent and not only WebRTC clients. That'd be worth a reference and
maybe thinking about which attacks are generic ICE issues and don't
only affect WebRTC.

   [3] https://doi.org/10.1145/3019612.3019844

- I also wondered if I can fingerprint a host based on how it does ICE?  
  I  suspect that might work, but haven't tried to figure out details.

- Could I probe an internal network based on feeding it candidates to
  check? E.g. checking timing of reactions.  If I could that seems
noteworthy.

(2) 5.3: "...MUST contain ... <foo> bits of randomness" Don't you need
to say when these values MUST be different and when they're ok to be
re-used? I forget if STUN/TURN do that. (Also - the phrasing isn't
that great - how do I "contain" randomness? But that's just a nit.)

Nits:

I took at look at the diff [4] between this and 5245, but that wasn't
really that useful, so this review is based on a read of the draft
without comparing it to 5245. Apologies if that causes me to comment
on text that's unchanged - in such cases, I think it's fine to not
heed those particular comments. 

   [4] https://tools.ietf.org/rfcdiff?url1=rfc5245&url2=draft-ietf-ice-rfc5245bis-16.txt

- 2.1: Why "only UDP specified here"? Does that include QUIC which is
  UDP-based, but not UDP? I assume so.

- 2.3: how the controlling/controlled stuff works isn't clear from
  this, nor even (as I was reading it) in section 7.3.1.1 - I wasn't
clear how the tie-breaker value is initialised until I got to 16.1.
In any case I think a bit more explanatory text in 2.3 might be good.
(But if implementers haven't had a problem with this, maybe it's just
me.)

- 5.2: "The procedures in this section is common across the initiating
  and responding agents." s/is/are/ I guess?

- 6.1.1: What is "3PCC"? That note could maybe also do with a
  reference, as I at least don't get what you're trying to tell me. Ah
- it's 3rd party call control (mentioned in 7.3.1.1).

- 16.1: For a given ICE session, are the random numbers in the
  ICE-CONTROLLED and ICE-CONTROLLING attributes sent by the same agent
supposed to have the same value? I wasn't clear. If they are the same,
I understand how tie-breaking happens. If they can differ, I'm not
sure. (But I didn't go back and re-read 7.3.1.1, so it may be ok
either way:-) In any case saying "referred to as the tie-breaker
value" twice seems odd. 

- 16.1: (mega-mega-nit:-) the fact that tie-breaker is split over a
  line-breaker here is why I didn't find this when I was reading
2.3/7.3.1.1 - maybe tweak the words so a grep will find it?)

- 17: "looking to deploy ICE" is a bit confusing - do you mean
  "looking to be nice to ICE"? My assumption is that endpoints deploy
ICE agents but network operators don't, though they might deploy
STUN/TURN servers I guess. But maybe I'm thinking too much about
WebRTC there.

- 18: I wondered if this is still needed, given that 5245 already said
  it (I didn't check if the text has been updated). Saying this once
would seem sufficient to me anyway. I guess leaving it in is the
easier path.

- 19: s/DNS-SEC/DNSSEC/ would be more common

- 19.4.1: 1st sentence if missing a "T" - s/he/The/



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From: Phillip Hallam-Baker <hallam@gmail.com>
Date: Fri, 26 Jan 2018 13:11:27 -0500
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--001a113cd22a41707b0563b1d377
Content-Type: text/plain; charset="UTF-8"

Just saw this didn't get the boilerplate added when posted by the tracker.
Please assume it to be there.

On Thu, Jan 25, 2018 at 3:35 PM, Phillip Hallam-Baker <hallam@gmail.com>
wrote:

> Reviewer: Phillip Hallam-Baker
> Review result: Has Nits
>
> I have reviewed the document and it is generally free of security
> considerations as claimed. There are some areas of concern however, the
> significance of which may become more apparent as such tools find future
> use.
>
> As described in the document, the tree diagram format is intended to serve
> as
> an output generated by a tool to aid human interpretation. Thus, a
> potential
> ambiguity can arise if the tool used to generate the format is buggy or if
> the
> document contains schema and presentation data compiled from different
> versions
> of the source.
>
> Specifications using this representation need to make clear which
> representation is canonical. Otherwise we end up in a situation in which a
> document that has an ambiguity being unfixable by means of issuing an
> errata
> because there is no agreement as to whether the change is breaking or not.
>
> Another issue that is of concern is that even though the format is not
> intended
> to be an input format, there can be no guarantee it will not be used as
> such.
> Indeed it could be argued that a spec that makes use of this format should
> encourage this approach so as to detect possible ambiguities.
>
> _______________________________________________
> secdir mailing list
> secdir@ietf.org
> https://www.ietf.org/mailman/listinfo/secdir
> wiki: http://tools.ietf.org/area/sec/trac/wiki/SecDirReview
>



-- 
Website: http://hallambaker.com/

--001a113cd22a41707b0563b1d377
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small">Jus=
t saw this didn&#39;t get the boilerplate added when posted by the tracker.=
 Please assume it to be there.</div></div><div class=3D"gmail_extra"><br><d=
iv class=3D"gmail_quote">On Thu, Jan 25, 2018 at 3:35 PM, Phillip Hallam-Ba=
ker <span dir=3D"ltr">&lt;<a href=3D"mailto:hallam@gmail.com" target=3D"_bl=
ank">hallam@gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_q=
uote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1e=
x">Reviewer: Phillip Hallam-Baker<br>
Review result: Has Nits<br>
<br>
I have reviewed the document and it is generally free of security<br>
considerations as claimed. There are some areas of concern however, the<br>
significance of which may become more apparent as such tools find future us=
e.<br>
<br>
As described in the document, the tree diagram format is intended to serve =
as<br>
an output generated by a tool to aid human interpretation. Thus, a potentia=
l<br>
ambiguity can arise if the tool used to generate the format is buggy or if =
the<br>
document contains schema and presentation data compiled from different vers=
ions<br>
of the source.<br>
<br>
Specifications using this representation need to make clear which<br>
representation is canonical. Otherwise we end up in a situation in which a<=
br>
document that has an ambiguity being unfixable by means of issuing an errat=
a<br>
because there is no agreement as to whether the change is breaking or not.<=
br>
<br>
Another issue that is of concern is that even though the format is not inte=
nded<br>
to be an input format, there can be no guarantee it will not be used as suc=
h.<br>
Indeed it could be argued that a spec that makes use of this format should<=
br>
encourage this approach so as to detect possible ambiguities.<br>
<br>
______________________________<wbr>_________________<br>
secdir mailing list<br>
<a href=3D"mailto:secdir@ietf.org">secdir@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/secdir" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/secdir</a><br=
>
wiki: <a href=3D"http://tools.ietf.org/area/sec/trac/wiki/SecDirReview" rel=
=3D"noreferrer" target=3D"_blank">http://tools.ietf.org/area/<wbr>sec/trac/=
wiki/SecDirReview</a><br>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div class=
=3D"gmail_signature" data-smartmail=3D"gmail_signature">Website: <a href=3D=
"http://hallambaker.com/" target=3D"_blank">http://hallambaker.com/</a><br>=
</div>
</div>

--001a113cd22a41707b0563b1d377--


From nobody Fri Jan 26 13:04:31 2018
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From: Russ Housley <housley@vigilsec.com>
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Subject: [secdir] Secdir last call review of draft-ietf-bmwg-sdn-controller-benchmark-meth-07
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Reviewer: Russ Housley
Review result: Has Issues

I 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 authors, document editors, and WG chairs should
treat these comments just like any other IETF Last Call comments.

Document: draft-ietf-bmwg-sdn-controller-benchmark-meth-05
Reviewer: Russ Housley
Review Date: 2018-01-26
IETF LC End Date: 2018-02-02
IESG Telechat date: Unknown

Summary: Has (Minor) Issues

Major Concerns

The tests cover encrypted and unencrypted communications, but nothing
is said about the key management.  I recognize that the tests will be
conducted in the lab, but it would be desirable for the key management
to exercise the same interfaces that will be used in a production
setting.


Minor Concerns

Section 1: Please update the first paragraph to reference RFC 8174
in addition to RFC 2119, as follows: 

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

RFC 2119 is missing from the normative references.  If you accept the
above suggestion, RFC 8174 needs to be added as well.


Nits

The term "SDN Controller" is not defined in the companion terminology
document, and a definition does not emerge in this document until
Section 2, where it says:

   ... the SDN controller is a function that manages and
   controls Network Devices. ...

I recognize that this is very basic, but it also seems like very
important information for the Introduction.

Similarly, please explain the difference between a "cluster of
homogeneous controllers" and a "federation of controllers."

The indenting in the document shifts in Section 5.  Some lines
other than Section headers are flush with the left margin.



From nobody Fri Jan 26 13:45:11 2018
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Subject: [secdir] [new-work] WG Review: Routing In Fat Trees (rift)
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A new IETF WG has been proposed in the Routing Area. The IESG has not made
any determination yet. The following draft charter was submitted, and is
provided for informational purposes only. Please send your comments to the
IESG mailing list (iesg@ietf.org) by 2018-02-05.

Routing In Fat Trees (rift)
-----------------------------------------------------------------------
Current status: Proposed WG

Chairs:
  Zhaohui Zhang <zzhang@juniper.net>

Assigned Area Director:
  Alvaro Retana <aretana.ietf@gmail.com>

Routing Area Directors:
  Alia Atlas <akatlas@gmail.com>
  Alvaro Retana <aretana.ietf@gmail.com>
  Deborah Brungard <db3546@att.com>

Mailing list:
  Address: rift@ietf.org
  To subscribe: https://www.ietf.org/mailman/listinfo/rift
  Archive: https://mailarchive.ietf.org/arch/search/?email_list=rift

Group page: https://datatracker.ietf.org/group/rift/

Charter: https://datatracker.ietf.org/doc/charter-ietf-rift/

Data Centers have been steadily growing to commonly host tens of thousands
of end points, or more, in a single network.  Because of their topologies
(traditional and emerging), traffic patterns, need for fast restoration,
and for low human intervention, data center networks have a unique set of
requirements that is resulting in the design of routing solutions specific
to them.  Clos and Fat-Tree topologies have gained popularity in data center
networks as a result of a trend towards centralized data center network
architectures that may deliver computation and storage services.

The Routing in Fat Trees (RIFT) protocol addresses the demands of routing in
Clos and Fat-Tree networks via a mixture of both link-state and
distance-vector techniques colloquially described as 'link-state towards the
spine and distance vector towards the leafs'.  RIFT uses this hybrid approach
to focus on networks with regular topologies with a high degree of
connectivity, a defined directionality, and large scale.

The RIFT Working Group will work on a standards track specification of a
specialized, dynamic routing protocol for Clos and fat-tree network
topologies. The protocol will:

 - deal with automatic construction of fat-tree topologies based on detection
 of links,

 - minimize the amount of routing state held at each topology level,

 - automatically prune topology distribution exchanges to a sufficient subset
 of links,

 - support automatic disaggregation of prefixes on link and node failures to
 prevent black-holing and suboptimal routing,

 - allow traffic steering and re-routing policies,

 - and provide mechanisms to synchronize a limited key-value data-store that
 can be used after protocol convergence.

It is important that nodes participating in the protocol should need only
very light configuration and should be able to join a network as leaf nodes
simply by connecting to the network using default configuration.

The protocol must support IPv6 and should also support IPv4.

The Working Group may establish additional requirements to constrain and
inform their work.

The RIFT Working Group is chartered for the following list of items:

 - A Standards Track specification that will include:
   - an Implementation Status section as described in RFC 7942
   - an Operational Considerations section to explain how the protocol is
   configured, deployed, and diagnosed - Security and Privacy Considerations,
   although this material may refer to a separate Threat Analysis document
   (q.v.)

 - A YANG module focused on configuration and monitoring of protocol instances

 - An Applicability Statement that describes how to deploy and configure the
 protocol in networks with different topologies

 - A Security Threat Analysis document that describes the attack vectors and
 mitigations that shall be sent for publication at the same time as the
 protocol specification

Milestones

Mar 2018 Adopt a protocol specification document
Feb 2019 Submit protocol specification to IESG for publication
Feb 2019 Submit Threat Analysis to IESG for publication
Apr 2019 Submit YANG module to IESG for publication
Apr 2019 Submit Applicability Statement to IESG for publication


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Subject: [secdir] [new-work] WG Review: Service Function Chaining (sfc)
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The Service Function Chaining (sfc) WG in the Routing Area of the IETF is
undergoing rechartering. The IESG has not made any determination yet. The
following draft charter was submitted, and is provided for informational
purposes only. Please send your comments to the IESG mailing list
(iesg@ietf.org) by 2018-02-05.

Service Function Chaining (sfc)
-----------------------------------------------------------------------
Current status: Active WG

Chairs:
  Joel Halpern <jmh@joelhalpern.com>
  Jim Guichard <james.n.guichard@huawei.com>

Secretaries:
  Tal Mizrahi <talmi@marvell.com>

Assigned Area Director:
  Alia Atlas <akatlas@gmail.com>

Routing Area Directors:
  Alia Atlas <akatlas@gmail.com>
  Alvaro Retana <aretana.ietf@gmail.com>
  Deborah Brungard <db3546@att.com>

Mailing list:
  Address: sfc@ietf.org
  To subscribe: https://www.ietf.org/mailman/listinfo/sfc
  Archive: https://mailarchive.ietf.org/arch/browse/sfc/

Group page: https://datatracker.ietf.org/group/sfc/

Charter: https://datatracker.ietf.org/doc/charter-ietf-sfc/

Network operators frequently utilize service functions such as packet
filtering at firewalls, load-balancing and transactional proxies (for example
spam filters) in the delivery of services to end users. Delivery of these
types of services is undergoing significant change with the introduction of
virtualization, network overlays, and orchestration.

The SFC Working Group has developed an Architecture [RFC 7665] and the
Network Service Header [RFC 8300] for service function chaining.

The focus of the SFC working group moving forward is on aspects of the
architecture and/or protocol that need to be addressed to enable effective
deployment and usage of this work. In order to maintain focus, the working
group primarily produces and advances documents on four topics:

1) Metadata - Define the common type-length-value encoded metadata types with
Standards Track RFCs, and produce Informational RFCs to describe common
fixed-length (MD-1) metadata usages.

2) Security and Privacy - Mechanisms and guidance for securing metadata via
authentication, integrity protection, confidentiality, and/or data
minimization are not yet defined.  What can be effectively provided, for
which scenarios, and how those tools can be provided need to be determined
and the tools standardized.

3) OAM and Operations & Management - In order for operators to use these
tools in production networks, they need Operations, Administration, and
Maintenance tools, as well as management mechanisms.  This includes YANG
models, OAM frameworks, and specific OAM mechanisms to address operational
needs.

4) Transport Considerations - This will capture the expectations SFC places
on transport behavior, including dealing with issues such as congestion
indications and responses.  This should define how NSH works on standardized
transports that are expected to see widespread use.

Specifically, the SFC WG is chartered to deliver the following:

1. A Standards Track base set of the metadata MD-2 type codes within the
metadata class reserved for IETF usage, as specified in RFC 8300.

2. Related Metadata drafts that require more explanation than is reasonable
to include in the base MD-2 draft, including MD-1 descriptions and items done
once the base draft is complete.

3. YANG models for the management of SFC Components.

4. One or more security related Standards Track and / or Informational RFCs. 
At least one Standards Track security mechanism RFC is needed.

5. OAM Framework document to provide a common basis for OAM work.  This draft
will include guidance on how active, passive, and hybrid OAM are to be
supported if at all.

6. Specific OAM mechanism documents to provide the tools needed for
operational environments.

7. Transport Considerations RFC to cover the expectations SFC and NSH place
on transport, and the operational constraints transports used by NSH need to
meet.

The SFC WG may work on Informational applicability documents that show how
the technology, meta-data, and associated control-plane mechanisms can be
used in specific use-cases.  The SFC WG may work on Informational documents
that provide operational considerations.

The SFC WG will coordinate with BESS and PCE on the control-plane work
related to SFC.

Milestones:

TBD

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CC: "ietf@ietf.org" <ietf@ietf.org>, "bmwg@ietf.org" <bmwg@ietf.org>, "draft-ietf-bmwg-sdn-controller-benchmark-meth.all@ietf.org" <draft-ietf-bmwg-sdn-controller-benchmark-meth.all@ietf.org>
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, "secdir@ietf.org" <secdir@ietf.org>
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Thread-Topic: Secdir last call review of draft-ietf-ice-rfc5245bis-16
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Subject: Re: [secdir] Secdir last call review of draft-ietf-ice-rfc5245bis-16
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Subject: Re: [secdir] [bmwg] Secdir last call review of draft-ietf-bmwg-sdn-controller-benchmark-meth-07
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Hi Russ,
Thank you for your comments.
I believe adding Al text helps to address your major concerns.=20
Regarding your minor concerns and Nits feedback, we will address and submit=
 the revised drafts.
Best Regards,
Bhuvan

On Sat, Jan 27, 2018 at 05:58 AM, "MORTON, ALFRED C (AL)"  wrote:
Hi Russ,

Major Concerns

The tests cover encrypted and unencrypted communications, but nothing
is said about the key management.  I recognize that the tests will be
conducted in the lab, but it would be desirable for the key management
to exercise the same interfaces that will be used in a production
setting.

Encrypted connections with network devices are mentioned in general,
primarily in Section 4.4, as a possibility that may be tested:
https://tools.ietf.org/html/draft-ietf-bmwg-sdn-controller-benchmark-meth-0=
7#section-4.4 (https://tools.ietf.org/html/draft-ietf-bmwg-sdn-controller-b=
enchmark-meth-07#section-4.4)

It will help if we can iterate on text to satisfy your comment,
such as adding:
4.4. Connection Setup

There may be controller implementations that support unencrypted and
encrypted network connections with Network Devices. Further, the
controller may have backward compatibility with Network Devices
running older versions of southbound protocols. It may be useful to
measure the controller performance with one or more applicable
connection setup methods defined below.
ADD
For cases with encrypted communications between the controller and the=20
switch, key management and key exchange MUST take place before
any performance or benchmark measurements.

just trying to clarify what you want to see added,
Al
doc shepherd

-----Original Message-----
From: Russ Housley [mailto:housley@vigilsec.com (mailto:housley@vigilsec.co=
m)]
Sent: Friday, January 26, 2018 4:04 PM
To: secdir@ietf.org (mailto:secdir@ietf.org)
Cc: ietf@ietf.org (mailto:ietf@ietf.org); bmwg@ietf.org (mailto:bmwg@ietf.o=
rg); draft-ietf-bmwg-sdn-controller-
benchmark-meth.all@ietf.org (mailto:benchmark-meth.all@ietf.org)
Subject: Secdir last call review of draft-ietf-bmwg-sdn-controller-
benchmark-meth-07

Reviewer: Russ Housley
Review result: Has Issues

I 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 authors, document editors, and WG chairs should
treat these comments just like any other IETF Last Call comments.

Document: draft-ietf-bmwg-sdn-controller-benchmark-meth-05
Reviewer: Russ Housley
Review Date: 2018-01-26
IETF LC End Date: 2018-02-02
IESG Telechat date: Unknown

Summary: Has (Minor) Issues

Major Concerns

The tests cover encrypted and unencrypted communications, but nothing
is said about the key management.  I recognize that the tests will be
conducted in the lab, but it would be desirable for the key management
to exercise the same interfaces that will be used in a production
setting.

Minor Concerns

Section 1: Please update the first paragraph to reference RFC 8174
in addition to RFC 2119, as follows:

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.

RFC 2119 is missing from the normative references.  If you accept the
above suggestion, RFC 8174 needs to be added as well.

Nits

The term "SDN Controller" is not defined in the companion terminology
document, and a definition does not emerge in this document until
Section 2, where it says:

... the SDN controller is a function that manages and
controls Network Devices. ...

I recognize that this is very basic, but it also seems like very
important information for the Introduction.

Similarly, please explain the difference between a "cluster of
homogeneous controllers" and a "federation of controllers."

The indenting in the document shifts in Section 5.  Some lines
other than Section headers are flush with the left margin.

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------=_Part_916_174912113.1517210769
Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE html><html><head><meta http-equiv=3D"Content-Type" content=3D"tex=
t/html; charset=3Dutf-8" /></head><body><div data-crea=3D"font-wrapper" sty=
le=3D"font-family: Calibri; font-size: 16px; direction: ltr"><div style=3D"=
font-family: Calibri; font-size: 16px"></div>Hi Russ,<div><br></div><div>Th=
ank you for your comments.<br>I believe adding Al text helps to address you=
r major concerns.=C2=A0</div><div>Regarding your minor concerns and Nits fe=
edback, we will address and submit the revised drafts.</div><div><br></div>=
<div>Best Regards,</div><div>Bhuvan<br><br><div data-anchor=3D"reply-title"=
>On Sat, Jan 27, 2018 at 05:58 AM, "MORTON, ALFRED C (AL)" &lt;acmorton@att=
.com&gt; wrote:</div><blockquote><div>Hi Russ,<br><br><blockquote>Major Con=
cerns<br><br>The tests cover encrypted and unencrypted communications, but =
nothing<br>is said about the key management.=C2=A0=C2=A0I recognize that th=
e tests will be<br>conducted in the lab, but it would be desirable for the =
key management<br>to exercise the same interfaces that will be used in a pr=
oduction<br>setting.</blockquote><br><br>Encrypted connections with network=
 devices are mentioned in general,<br>primarily in Section 4.4, as a possib=
ility that may be tested:<br><a target=3D"_blank" href=3D"https://tools.iet=
f.org/html/draft-ietf-bmwg-sdn-controller-benchmark-meth-07#section-4.4" st=
yle=3D"cursor: inherit;">https://tools.ietf.org/html/draft-ietf-bmwg-sdn-co=
ntroller-benchmark-meth-07#section-4.4</a><br><br>It will help if we can it=
erate on text to satisfy your comment,<br>such as adding:<br>4.4. Connectio=
n Setup<br><br>There may be controller implementations that support unencry=
pted and<br>encrypted network connections with Network Devices. Further, th=
e<br>controller may have backward compatibility with Network Devices<br>run=
ning older versions of southbound protocols. It may be useful to<br>measure=
 the controller performance with one or more applicable<br>connection setup=
 methods defined below.<br>ADD<br>For cases with encrypted communications b=
etween the controller and the <br>switch, key management and key exchange M=
UST take place before<br>any performance or benchmark measurements.<br><br>=
just trying to clarify what you want to see added,<br>Al<br>doc shepherd<br=
><br><blockquote>-----Original Message-----<br>From: Russ Housley [mailto:<=
a target=3D"_blank" href=3D"mailto:housley@vigilsec.com" style=3D"cursor: i=
nherit;">housley@vigilsec.com</a>]<br>Sent: Friday, January 26, 2018 4:04 P=
M<br>To: <a target=3D"_blank" href=3D"mailto:secdir@ietf.org" style=3D"curs=
or: inherit;">secdir@ietf.org</a><br>Cc: <a target=3D"_blank" href=3D"mailt=
o:ietf@ietf.org" style=3D"cursor: inherit;">ietf@ietf.org</a>; <a target=3D=
"_blank" href=3D"mailto:bmwg@ietf.org" style=3D"cursor: inherit;">bmwg@ietf=
.org</a>; draft-ietf-bmwg-sdn-controller-<br><a target=3D"_blank" href=3D"m=
ailto:benchmark-meth.all@ietf.org" style=3D"cursor: inherit;">benchmark-met=
h.all@ietf.org</a><br>Subject: Secdir last call review of draft-ietf-bmwg-s=
dn-controller-<br>benchmark-meth-07<br><br>Reviewer: Russ Housley<br>Review=
 result: Has Issues<br><br>I reviewed this document as part of the Security=
 Directorate's ongoing<br>effort to review all IETF documents being process=
ed by the IESG.=C2=A0=C2=A0These<br>comments were written primarily for the=
 benefit of the Security Area<br>Directors.=C2=A0=C2=A0Document authors, do=
cument editors, and WG chairs should<br>treat these comments just like any =
other IETF Last Call comments.<br><br>Document: draft-ietf-bmwg-sdn-control=
ler-benchmark-meth-05<br>Reviewer: Russ Housley<br>Review Date: 2018-01-26<=
br>IETF LC End Date: 2018-02-02<br>IESG Telechat date: Unknown<br><br>Summa=
ry: Has (Minor) Issues<br><br>Major Concerns<br><br>The tests cover encrypt=
ed and unencrypted communications, but nothing<br>is said about the key man=
agement.=C2=A0=C2=A0I recognize that the tests will be<br>conducted in the =
lab, but it would be desirable for the key management<br>to exercise the sa=
me interfaces that will be used in a production<br>setting.<br><br>Minor Co=
ncerns<br><br>Section 1: Please update the first paragraph to reference RFC=
 8174<br>in addition to RFC 2119, as follows:<br><br>The key words "MUST", =
"MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",<br>"SHOULD", "SHOULD NOT", "R=
ECOMMENDED", "NOT RECOMMENDED", "MAY", and<br>"OPTIONAL" in this document a=
re to be interpreted as described in BCP<br>14 [RFC2119] [RFC8174] when, an=
d only when, they appear in all<br>capitals, as shown here.<br><br>RFC 2119=
 is missing from the normative references.=C2=A0=C2=A0If you accept the<br>=
above suggestion, RFC 8174 needs to be added as well.<br><br>Nits<br><br>Th=
e term "SDN Controller" is not defined in the companion terminology<br>docu=
ment, and a definition does not emerge in this document until<br>Section 2,=
 where it says:<br><br>... the SDN controller is a function that manages an=
d<br>controls Network Devices. ...<br><br>I recognize that this is very bas=
ic, but it also seems like very<br>important information for the Introducti=
on.<br><br>Similarly, please explain the difference between a "cluster of<b=
r>homogeneous controllers" and a "federation of controllers."<br><br>The in=
denting in the document shifts in Section 5.=C2=A0=C2=A0Some lines<br>other=
 than Section headers are flush with the left margin.</blockquote><br><br>_=
______________________________________________<br>bmwg mailing list<br><a t=
arget=3D"_blank" href=3D"mailto:bmwg@ietf.org" style=3D"cursor: inherit;">b=
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an/listinfo/bmwg" style=3D"cursor: inherit;">https://www.ietf.org/mailman/l=
istinfo/bmwg</a></div></blockquote></div></div>DISCLAIMER: Privileged and/o=
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Hiya,

Sorry for the slowish response, more inline...

On 28/01/18 12:57, Christer Holmberg wrote:
> Hi Stephen,
>=20
> Thank You for your review! Please see inline.
>=20
>> Reviewer: Stephen Farrell Review result: Has Issues
>>=20
>> (1) I think a bit more work on the security and privacy issues
>> around ICE would improve >the document, and hopefully, ICE
>> implementations.
>>=20
>> - There has been (IMO somewhat justified) concern [1] about
>> exposing all possible >addresses, for example where one is from a
>> VPN intended to preserve privacy, say if a >user is aiming to
>> circumvent local censorship or surveillance.  5.1.1.1 has a SHOULD
>> that, >as I read it, says to always include such addresses.
>>=20
>> [1] https://www.w3.org/wiki/Privacy/IPAddresses
>>=20
>> (Note: I'm not claiming [1] is authoritative, it's just a page I
>> found that describes the issue reasonably well.)
>>=20
>> There is a bit of text about this (1st para in section 19), but IMO
>> it's a bit weak.
>>=20
>> - Did the WG consider REQUIRING or RECOMMENDING agent
>> implementations provide some local interface that allows the host
>> or an application to say "Don't use <this> interface to generate
>> any candidates until I tell you otherwise"?  That might be better
>> than having VPN operators recommending to turn off WebRTC entirely
>> for example. (Note: this is my main comment, the rest are mostly
>> suggested things to think about, if you've not already.)
>>=20
>> - Even if the text isn't changed, a reference to [2] would I think
>> be useful. (Assuming [2] is still being worked on in rtcweb, though
>> mind you, I don't like how [2] refers to "consent" as I doubt a
>> random person can really provide meaningful consent for things like
>> this.)
>>=20
>> [2] https://tools.ietf.org/html/draft-ietf-rtcweb-ip-handling-04
>=20
> I would not want to REQUIRE implementing a local interface for
> controlling the candidates, as ICE is also used by different types of
> network entities (gateways etc). But, I am ok to RECOMMEND.

Fair enough.

>=20
> What about:
>=20
> OLD:
>=20
> "Individual implementations may also have implementation-specific
> rules for controlling which addresses are revealed."
>=20
> NEW:
>=20
> "Individual implementations may also have implementation-specific
> rules for controlling which addresses are revealed. It is RECOMMENDED
> that applications interacting with human users provide a user
> interfaces that allows the users to control which interfaces are used
> to generate candidates, or when to use candidates generated for the
> interfaces.
>=20
> [REF-to- draft-ietf-rtcweb-ip-handling] provide additional
> information and Requirements regarding the handing of IP addresses
> for WebRTC applications."

That's a fine improvement from my POV, esp if folks will
really provide such interfaces. I'm not sure "interacting
with humans" is quite right though, maybe it'd be better
to add a reference to the problem (via [1] or [rtcweb-ip])
and to then say "Implementations where such issues can
arise are RECOMMENDED to..." I'd also suggest maybe
s/user interface/interface/ there, as e.g. a VPN client
might want to use an API provided by an ICE implementation
so the UI might be part of the VPN client and not the ICE
implementation. So, overall I'd suggest something like
this:

"Individual implementations may also have implementation-specific
rules for controlling which addresses are revealed. For example,
[REF-to- draft-ietf-rtcweb-ip-handling] provides additional
information about the privacy aspects of revealing IP addresses
via ICE for WebRTC applications. ICE implementations where such
issues can arise are RECOMMENDED to provide a programmatic or
user interface that provides control over which network interfaces
are used to generate candidates."

>=20
>> - Separately [1] also describes another potential privacy issue
>> with STUN urls. I think it'd be worthwhile noting such issues that
>> have been found with deployments of ICE here, as any protocol using
>> ICE and accepting non locally configured STUN/TURN URLs may have=20
>> issues like that. For example, a recent paper [3] also describes
>> some attacks (in section 4.2 mostly) that could (I guess) be
>> mounted against any ICE agent and not only WebRTC clients. That'd
>> be worth a reference and maybe thinking about which attacks are
>> generic ICE issues and don't only affect WebRTC.
>>=20
>> [3] https://doi.org/10.1145/3019612.3019844
>=20
> I am struggling to figure out exactly what to do here... I really
> hope we don't have to perfom a study on [3], and see what is general,
> and what is WebRTC-specific. Are we even allowed to reference [3], as
> it's not freely available?

Sure, we can reference academic papers behind paywalls, and
there's often another version available that's not. (Not sure
in this case.)

>=20
> Some help and guidance would be appreciated :)

I guess about as much as can be done with this -bis effort is
to note where any leakages have been found. There's been some
recent traffic on the W3C WebRTC list about that I think, (in
the thread about CSP iirc) so maybe a trawl of that thread
will suggest some text?

>=20
> ---
>=20
>> - I also wondered if I can fingerprint a host based on how it does
>> ICE? I  suspect that might work, but haven't tried to figure out
>> details.
>>=20
>> - Could I probe an internal network based on feeding it candidates
>> to check? E.g. checking timing of reactions.  If I could that seems
>> noteworthy.
>=20
> Something like?
>=20
> "Based on the types of candidates provided by the peer, and the
> results of the connectivity tests performed Against those candidates,
> an agent might be able to determine characteristics of the peer
> network."

Maybe:

"Based on the types of candidates provided by the peer, and the
results of the connectivity tests performed against those candidates,
the peer might be able to determine characteristics of the local
network, e.g. if different timings are apparent to the peer. In
the limit the peer might be able to probe the local network."

That said - I'm not claiming this is possible for-sure, I just
bet it would be:-)


>=20
> ---
>=20
>> (2) 5.3: "...MUST contain ... <foo> bits of randomness" Don't you
>> need to say when these values MUST be different and when they're ok
>> to be re-used? I forget if STUN/TURN do that.
>=20
> Section 7.2.2 says:
>=20
> "A connectivity check Binding request MUST utilize the STUN
> short-term credential mechanism."
>=20
> RFC 5389 (STUN) says:
>=20
> "Short-Term Credential:  A temporary username and associated
> password that represent a shared secret between client and server.
> Short- term credentials are obtained through some kind of protocol=20
> mechanism between the client and server, preceding the STUN exchange.
> A short-term credential has an explicit temporal scope, which may be
> based on a specific amount of time (such as 5 minutes) or on an event
> (such as termination of a SIP dialog). The specific scope of a
> short-term credential is defined by the application usage."
>=20
> If anything extra is needed, I think that should be done as an update
> to STUN.

Not sure I agree - maybe I wasn't clear in my comment though,
so let me try rephrase it.

STUN doesn't define the duration for which short-term creds
are OK to be used. ICE does define a session concept therefore
ICE ought to say if short term STUN creds MUST/MUST-NOT/MAY
(or whatever) be re-used in different ICE sessions. Even
within an ICE session I guess in theory one could require
different short-term STUN credentials every single time, or
not. So I do think there's something to be said here.

>=20
>> (Also - the phrasing isn't that great - how do I "contain"
>> randomness? But that's just a nit.)
>=20
> Do you have a suggestion for a better word?

I think what you want is to say "unguessable, with at
least 128 bits of random number generator output used
to generate each" or something like that? It's a hard
one to get right, but even what you have isn't that
bad (I did say this was a nit:-)

The rest below are all fine,
Thanks,
S.

>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=

>=20
> Nits:
>=20
>> I took a look at the diff [4] between this and 5245, but that
>> wasn't really that useful, so this review is based on a read of the
>> draft without comparing it to 5245. Apologies if that causes me to
>> comment on text that's unchanged - in such cases, I think it's fine
>> to not heed those particular comments.
>>=20
>> [4]
>> https://tools.ietf.org/rfcdiff?url1=3Drfc5245&url2=3Ddraft-ietf-ice-rf=
c5245bis-16.txt
>>
>>
>>=20
- 2.1: Why "only UDP specified here"? Does that include QUIC which is
>> UDP-based, but not UDP? I assume so.
>=20
> There is a separate specification, RFC 6544, for TCP based
> candidates.
>=20
> Regarding QUIC, I don't know. QUIC wasn't discussed during the work,
> but how/if the procedures also apply to QUIC without any
> modifications etc I don't know.
>=20
>> - 2.3: how the controlling/controlled stuff works isn't clear from=20
>> this, nor even (as I was reading it) in section 7.3.1.1 - I wasn't
>> clear how the tie-breaker value is initialised until I got to
>> 16.1. In any case I think a bit more explanatory text in 2.3 might
>> be good. (But if implementers haven't had a problem with this,
>> maybe it's just me.)
>=20
> In general, one of the tasks of the bis work was to *simplify*
> section 2, because the previous version was too detailed for
> non-implementers who just want to figure out what ICE is all about
> (in order to  actually implement ICE, reading section 2 is obviously
> not enough). For that reason, my opinion was that section 2 doesn't
> really need to talk about role conflicts and tie-breaker values, as
> it's not essential for a high-level description of ICE.
>=20
> ---
>=20
>> - 5.2: "The procedures in this section is common across the
>> initiating and responding agents." s/is/are/ I guess?
>=20
> Yes. I will fix as suggested.
>=20
> ---
>=20
>> - 6.1.1: What is "3PCC"? That note could maybe also do with a=20
>> reference, as I at least don't get what you're trying to tell me.
>> Ah - it's 3rd party call control (mentioned in 7.3.1.1).
>=20
> I can use "3PCC (3rd Party Call Control)" in section 6.1.1.
>=20
> As the spec is protocol independent, I don't think there are any
> references that can be added.
>=20
> ---
>=20
>> - 16.1: For a given ICE session, are the random numbers in the=20
>> ICE-CONTROLLED and ICE-CONTROLLING attributes sent by the same
>> agent supposed to have the same value? I wasn't clear. If they are
>> the same, I understand how tie-breaking happens. If they can
>> differ, I'm not sure. (But I didn't go back and re-read 7.3.1.1, so
>> it may be ok either way:-)
>=20
> It is covered in the 2nd paragraph of section 7.2.5.1, which says
> that the agent MAY change the value when it switches role.
>=20
>> In any case saying "referred to as the tie-breaker value" twice
>> seems odd.
>=20
> I'll remove it from the ICE-CONTROLLING definition.
>=20
> ---
>=20
>> - 16.1: (mega-mega-nit:-) the fact that tie-breaker is split over
>> a line-breaker here is why I didn't find this when I was reading=20
>> 2.3/7.3.1.1 - maybe tweak the words so a grep will find it?)
>=20
> Good catch. I'll fix it.
>=20
> It would be really cool if search functions could discard line-breaks
> when searching for strings.
>=20
> ---
>=20
>> - 17: "looking to deploy ICE" is a bit confusing - do you mean=20
>> "looking to be nice to ICE"? My assumption is that endpoints deploy
>> ICE agents but network operators don't, though they might deploy
>> STUN/TURN servers I guess. But maybe I'm thinking too much about
>> WebRTC there.
>=20
> Perhaps something like:
>=20
> "This section discusses issues relevant to operators operating
> networks where ICE will be used by endpoints."
>=20
> ---
>=20
>> - 18: I wondered if this is still needed, given that 5245 already
>> said it (I didn't check if the text has been updated). Saying this
>> once would seem sufficient to me anyway. I guess leaving it in is
>> the easier path.
>=20
> I'll leave it :)
>=20
> ---
>=20
>> - 19: s/DNS-SEC/DNSSEC/ would be more common
>=20
> I will fix as suggested.
>=20
> ---
>=20
>> - 19.4.1: 1st sentence if missing a "T" - s/he/The/
>=20
> I will fix as suggested.
>=20
> ---
>=20
> Regards,
>=20
> Christer
>=20

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From nobody Tue Jan 30 05:54:42 2018
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-ice-rfc5245bis.all@ietf.org" <draft-ietf-ice-rfc5245bis.all@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "ice@ietf.org" <ice@ietf.org>
Thread-Topic: Secdir last call review of draft-ietf-ice-rfc5245bis-16
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Date: Tue, 30 Jan 2018 13:53:47 +0000
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Subject: Re: [secdir] Secdir last call review of draft-ietf-ice-rfc5245bis-16
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Hi,

>>>Reviewer: Stephen Farrell Review result: Has Issues
>>>=20
>>> (1) I think a bit more work on the security and privacy issues
>>> around ICE would improve >the document, and hopefully, ICE
>>> implementations.
>>>=20
>>> - There has been (IMO somewhat justified) concern [1] about
>>> exposing all possible >addresses, for example where one is from a
>>> VPN intended to preserve privacy, say if a >user is aiming to
>>> circumvent local censorship or surveillance.  5.1.1.1 has a SHOULD
>>> that, >as I read it, says to always include such addresses.
>>>=20
>>> [1] https://www.w3.org/wiki/Privacy/IPAddresses
>>>=20
>>> (Note: I'm not claiming [1] is authoritative, it's just a page I
>>> found that describes the issue reasonably well.)
>>>=20
>>> There is a bit of text about this (1st para in section 19), but IMO
>>> it's a bit weak.
>>>=20
>>> - Did the WG consider REQUIRING or RECOMMENDING agent
>>> implementations provide some local interface that allows the host
>>> or an application to say "Don't use <this> interface to generate
>>> any candidates until I tell you otherwise"?  That might be better
>>> than having VPN operators recommending to turn off WebRTC entirely
>>> for example. (Note: this is my main comment, the rest are mostly
>>> suggested things to think about, if you've not already.)
>>>=20
>>> - Even if the text isn't changed, a reference to [2] would I think
>>> be useful. (Assuming [2] is still being worked on in rtcweb, though
>>> mind you, I don't like how [2] refers to "consent" as I doubt a
>>> random person can really provide meaningful consent for things like
>>> this.)
>>>=20
>>> [2] https://tools.ietf.org/html/draft-ietf-rtcweb-ip-handling-04
>>=20
>> I would not want to REQUIRE implementing a local interface for
>> controlling the candidates, as ICE is also used by different types of
>> network entities (gateways etc). But, I am ok to RECOMMEND.
>
>Fair enough.
>
>>=20
>> What about:
>>=20
>> OLD:
>>=20
>> "Individual implementations may also have implementation-specific
>> rules for controlling which addresses are revealed."
>>=20
>> NEW:
>>=20
>> "Individual implementations may also have implementation-specific
>> rules for controlling which addresses are revealed. It is RECOMMENDED
>> that applications interacting with human users provide a user
>> interfaces that allows the users to control which interfaces are used
>> to generate candidates, or when to use candidates generated for the
>> interfaces.
>>=20
>> [REF-to- draft-ietf-rtcweb-ip-handling] provide additional
>> information and Requirements regarding the handing of IP addresses
>> for WebRTC applications."
>
>That's a fine improvement from my POV, esp if folks will
>really provide such interfaces. I'm not sure "interacting
>with humans" is quite right though, maybe it'd be better
>to add a reference to the problem (via [1] or [rtcweb-ip])
>and to then say "Implementations where such issues can
>arise are RECOMMENDED to..." I'd also suggest maybe
>s/user interface/interface/ there, as e.g. a VPN client
>might want to use an API provided by an ICE implementation
>so the UI might be part of the VPN client and not the ICE
>implementation. So, overall I'd suggest something like
>this:
>
>"Individual implementations may also have implementation-specific
>rules for controlling which addresses are revealed. For example,
>[REF-to- draft-ietf-rtcweb-ip-handling] provides additional
>information about the privacy aspects of revealing IP addresses
>via ICE for WebRTC applications. ICE implementations where such
>issues can arise are RECOMMENDED to provide a programmatic or
>user interface that provides control over which network interfaces
>are used to generate candidates."

Looks good :)

---

>>=20
>>> - Separately [1] also describes another potential privacy issue
>>> with STUN urls. I think it'd be worthwhile noting such issues that
>>> have been found with deployments of ICE here, as any protocol using
>>> ICE and accepting non locally configured STUN/TURN URLs may have
>>> issues like that. For example, a recent paper [3] also describes
>>> some attacks (in section 4.2 mostly) that could (I guess) be
>>> mounted against any ICE agent and not only WebRTC clients. That'd
>>> be worth a reference and maybe thinking about which attacks are
>>> generic ICE issues and don't only affect WebRTC.
>>>=20
>>> [3] https://doi.org/10.1145/3019612.3019844
>>=20
>> I am struggling to figure out exactly what to do here... I really
>> hope we don't have to perfom a study on [3], and see what is general,
>> and what is WebRTC-specific. Are we even allowed to reference [3], as
>> it's not freely available?
>
>Sure, we can reference academic papers behind paywalls, and
>there's often another version available that's not. (Not sure
>in this case.)
>
>>=20
>> Some help and guidance would be appreciated :)
>
>I guess about as much as can be done with this -bis effort is
>to note where any leakages have been found. There's been some
>recent traffic on the W3C WebRTC list about that I think, (in
>the thread about CSP iirc) so maybe a trawl of that thread
>will suggest some text?

I did follow that discussion. I will take a second look.

---

>>>- I also wondered if I can fingerprint a host based on how it does
>>> ICE? I  suspect that might work, but haven't tried to figure out
>>> details.
>>>=20
>>> - Could I probe an internal network based on feeding it candidates
>>> to check? E.g. checking timing of reactions.  If I could that seems
>>> noteworthy.
>>=20
>> Something like?
>>=20
>> "Based on the types of candidates provided by the peer, and the
>> results of the connectivity tests performed Against those candidates,
>> an agent might be able to determine characteristics of the peer
>> network."
>
>Maybe:
>
>"Based on the types of candidates provided by the peer, and the
>results of the connectivity tests performed against those candidates,
>the peer might be able to determine characteristics of the local
>network, e.g. if different timings are apparent to the peer. In
>the limit the peer might be able to probe the local network."
>
>That said - I'm not claiming this is possible for-sure, I just
>bet it would be:-)

The text looks good.

---

>>>(2) 5.3: "...MUST contain ... <foo> bits of randomness" Don't you
>>> need to say when these values MUST be different and when they're ok
>>> to be re-used? I forget if STUN/TURN do that.
>>=20
>> Section 7.2.2 says:
>>=20
>> "A connectivity check Binding request MUST utilize the STUN
>> short-term credential mechanism."
>>=20
>> RFC 5389 (STUN) says:
>>=20
>> "Short-Term Credential:  A temporary username and associated
>> password that represent a shared secret between client and server.
>> Short- term credentials are obtained through some kind of protocol
>> mechanism between the client and server, preceding the STUN exchange.
>> A short-term credential has an explicit temporal scope, which may be
>> based on a specific amount of time (such as 5 minutes) or on an event
>> (such as termination of a SIP dialog). The specific scope of a
>> short-term credential is defined by the application usage."
>>=20
>> If anything extra is needed, I think that should be done as an update
>> to STUN.
>
>Not sure I agree - maybe I wasn't clear in my comment though,
>so let me try rephrase it.
>
>STUN doesn't define the duration for which short-term creds
>are OK to be used. ICE does define a session concept therefore
>ICE ought to say if short term STUN creds MUST/MUST-NOT/MAY
>(or whatever) be re-used in different ICE sessions. Even
>within an ICE session I guess in theory one could require
>different short-term STUN credentials every single time, or
>not. So I do think there's something to be said here.

Section 9 says that an agent must create a new username fragment and
password for every new ICE session:

     "To restart ICE, an agent MUST change both the password and the
      username fragment for the data stream(s) being restarted.=B2


Since I also uses the username to identity the ICE session, the values
cannot be changed within a session.

There is no text on when a value can be re-used - apart from the fact that
they cannot be re-used when an ICE restart takes place.

My assumption has been that the randomness criteria are assumed to ensure
that two agents don=B9t choose the same values for the same session, and
that values are unlikely to be re-used within a short period of time.

We could say that agents shall verify that the same value is not re-used
as long as packets from a previous ICE session may still be present in the
network. But, that is not really security related, but more to make sure
ICE works.

---

>>=20
>>> (Also - the phrasing isn't that great - how do I "contain"
>>> randomness? But that's just a nit.)
>>=20
>> Do you have a suggestion for a better word?
>
>I think what you want is to say "unguessable, with at
>least 128 bits of random number generator output used
>to generate each" or something like that? It's a hard
>one to get right, but even what you have isn't that
>bad (I did say this was a nit:-)

What about?

     "Username Fragment and Password:  Values used to perform connectivity
      checks. The values MUST be unguessable, with at least 128 bits of
random=20
      number generator output used to generate the password, and at least
24=20
      bits output to generate the username fragment."


Thanks! :)

Regards,

Christer


>>=20
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>>=20
>> Nits:
>>=20
>>> I took a look at the diff [4] between this and 5245, but that
>>> wasn't really that useful, so this review is based on a read of the
>>> draft without comparing it to 5245. Apologies if that causes me to
>>> comment on text that's unchanged - in such cases, I think it's fine
>>> to not heed those particular comments.
>>>=20
>>> [4]
>>>=20
>>>https://tools.ietf.org/rfcdiff?url1=3Drfc5245&url2=3Ddraft-ietf-ice-rfc5=
245b
>>>is-16.txt
>>>
>>>
>>>=20
>- 2.1: Why "only UDP specified here"? Does that include QUIC which is
>>> UDP-based, but not UDP? I assume so.
>>=20
>> There is a separate specification, RFC 6544, for TCP based
>> candidates.
>>=20
>> Regarding QUIC, I don't know. QUIC wasn't discussed during the work,
>> but how/if the procedures also apply to QUIC without any
>> modifications etc I don't know.
>>=20
>>> - 2.3: how the controlling/controlled stuff works isn't clear from
>>> this, nor even (as I was reading it) in section 7.3.1.1 - I wasn't
>>> clear how the tie-breaker value is initialised until I got to
>>> 16.1. In any case I think a bit more explanatory text in 2.3 might
>>> be good. (But if implementers haven't had a problem with this,
>>> maybe it's just me.)
>>=20
>> In general, one of the tasks of the bis work was to *simplify*
>> section 2, because the previous version was too detailed for
>> non-implementers who just want to figure out what ICE is all about
>> (in order to  actually implement ICE, reading section 2 is obviously
>> not enough). For that reason, my opinion was that section 2 doesn't
>> really need to talk about role conflicts and tie-breaker values, as
>> it's not essential for a high-level description of ICE.
>>=20
>> ---
>>=20
>>> - 5.2: "The procedures in this section is common across the
>>> initiating and responding agents." s/is/are/ I guess?
>>=20
>> Yes. I will fix as suggested.
>>=20
>> ---
>>=20
>>> - 6.1.1: What is "3PCC"? That note could maybe also do with a
>>> reference, as I at least don't get what you're trying to tell me.
>>> Ah - it's 3rd party call control (mentioned in 7.3.1.1).
>>=20
>> I can use "3PCC (3rd Party Call Control)" in section 6.1.1.
>>=20
>> As the spec is protocol independent, I don't think there are any
>> references that can be added.
>>=20
>> ---
>>=20
>>> - 16.1: For a given ICE session, are the random numbers in the
>>> ICE-CONTROLLED and ICE-CONTROLLING attributes sent by the same
>>> agent supposed to have the same value? I wasn't clear. If they are
>>> the same, I understand how tie-breaking happens. If they can
>>> differ, I'm not sure. (But I didn't go back and re-read 7.3.1.1, so
>>> it may be ok either way:-)
>>=20
>> It is covered in the 2nd paragraph of section 7.2.5.1, which says
>> that the agent MAY change the value when it switches role.
>>=20
>>> In any case saying "referred to as the tie-breaker value" twice
>>> seems odd.
>>=20
>> I'll remove it from the ICE-CONTROLLING definition.
>>=20
>> ---
>>=20
>>> - 16.1: (mega-mega-nit:-) the fact that tie-breaker is split over
>>> a line-breaker here is why I didn't find this when I was reading
>>> 2.3/7.3.1.1 - maybe tweak the words so a grep will find it?)
>>=20
>> Good catch. I'll fix it.
>>=20
>> It would be really cool if search functions could discard line-breaks
>> when searching for strings.
>>=20
>> ---
>>=20
>>> - 17: "looking to deploy ICE" is a bit confusing - do you mean
>>> "looking to be nice to ICE"? My assumption is that endpoints deploy
>>> ICE agents but network operators don't, though they might deploy
>>> STUN/TURN servers I guess. But maybe I'm thinking too much about
>>> WebRTC there.
>>=20
>> Perhaps something like:
>>=20
>> "This section discusses issues relevant to operators operating
>> networks where ICE will be used by endpoints."
>>=20
>> ---
>>=20
>>> - 18: I wondered if this is still needed, given that 5245 already
>>> said it (I didn't check if the text has been updated). Saying this
>>> once would seem sufficient to me anyway. I guess leaving it in is
>>> the easier path.
>>=20
>> I'll leave it :)
>>=20
>> ---
>>=20
>>> - 19: s/DNS-SEC/DNSSEC/ would be more common
>>=20
>> I will fix as suggested.
>>=20
>> ---
>>=20
>>> - 19.4.1: 1st sentence if missing a "T" - s/he/The/
>>=20
>> I will fix as suggested.
>>=20
>> ---
>>=20
>> Regards,
>>=20
>> Christer
>>=20
>
>--=20
>PGP key change time for me.
>New-ID 7B172BEA; old-ID 805F8DA2 expires Jan 24 2018.
>NewWithOld sigs in keyservers.
>Sorry if that mucks something up;-)


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Hiya,

Those look close-enough or fine to me. For the
recent WebRTC thread, if you find something, that'll
be a good thing. If not, and nobody suggests some
text, then I guess at least we did try:-) And FWIW I'm
fine with that, as I'm not up to speed on non-WebRTC
uses of ICE, so don't know if the same leakage issues
can arise in reality, outside of WebRTC.

Thanks,
S.

On 30/01/18 13:53, Christer Holmberg wrote:
> Hi,
>=20
>>>> Reviewer: Stephen Farrell Review result: Has Issues
>>>>
>>>> (1) I think a bit more work on the security and privacy issues
>>>> around ICE would improve >the document, and hopefully, ICE
>>>> implementations.
>>>>
>>>> - There has been (IMO somewhat justified) concern [1] about
>>>> exposing all possible >addresses, for example where one is from a
>>>> VPN intended to preserve privacy, say if a >user is aiming to
>>>> circumvent local censorship or surveillance.  5.1.1.1 has a SHOULD
>>>> that, >as I read it, says to always include such addresses.
>>>>
>>>> [1] https://www.w3.org/wiki/Privacy/IPAddresses
>>>>
>>>> (Note: I'm not claiming [1] is authoritative, it's just a page I
>>>> found that describes the issue reasonably well.)
>>>>
>>>> There is a bit of text about this (1st para in section 19), but IMO
>>>> it's a bit weak.
>>>>
>>>> - Did the WG consider REQUIRING or RECOMMENDING agent
>>>> implementations provide some local interface that allows the host
>>>> or an application to say "Don't use <this> interface to generate
>>>> any candidates until I tell you otherwise"?  That might be better
>>>> than having VPN operators recommending to turn off WebRTC entirely
>>>> for example. (Note: this is my main comment, the rest are mostly
>>>> suggested things to think about, if you've not already.)
>>>>
>>>> - Even if the text isn't changed, a reference to [2] would I think
>>>> be useful. (Assuming [2] is still being worked on in rtcweb, though
>>>> mind you, I don't like how [2] refers to "consent" as I doubt a
>>>> random person can really provide meaningful consent for things like
>>>> this.)
>>>>
>>>> [2] https://tools.ietf.org/html/draft-ietf-rtcweb-ip-handling-04
>>>
>>> I would not want to REQUIRE implementing a local interface for
>>> controlling the candidates, as ICE is also used by different types of=

>>> network entities (gateways etc). But, I am ok to RECOMMEND.
>>
>> Fair enough.
>>
>>>
>>> What about:
>>>
>>> OLD:
>>>
>>> "Individual implementations may also have implementation-specific
>>> rules for controlling which addresses are revealed."
>>>
>>> NEW:
>>>
>>> "Individual implementations may also have implementation-specific
>>> rules for controlling which addresses are revealed. It is RECOMMENDED=

>>> that applications interacting with human users provide a user
>>> interfaces that allows the users to control which interfaces are used=

>>> to generate candidates, or when to use candidates generated for the
>>> interfaces.
>>>
>>> [REF-to- draft-ietf-rtcweb-ip-handling] provide additional
>>> information and Requirements regarding the handing of IP addresses
>>> for WebRTC applications."
>>
>> That's a fine improvement from my POV, esp if folks will
>> really provide such interfaces. I'm not sure "interacting
>> with humans" is quite right though, maybe it'd be better
>> to add a reference to the problem (via [1] or [rtcweb-ip])
>> and to then say "Implementations where such issues can
>> arise are RECOMMENDED to..." I'd also suggest maybe
>> s/user interface/interface/ there, as e.g. a VPN client
>> might want to use an API provided by an ICE implementation
>> so the UI might be part of the VPN client and not the ICE
>> implementation. So, overall I'd suggest something like
>> this:
>>
>> "Individual implementations may also have implementation-specific
>> rules for controlling which addresses are revealed. For example,
>> [REF-to- draft-ietf-rtcweb-ip-handling] provides additional
>> information about the privacy aspects of revealing IP addresses
>> via ICE for WebRTC applications. ICE implementations where such
>> issues can arise are RECOMMENDED to provide a programmatic or
>> user interface that provides control over which network interfaces
>> are used to generate candidates."
>=20
> Looks good :)
>=20
> ---
>=20
>>>
>>>> - Separately [1] also describes another potential privacy issue
>>>> with STUN urls. I think it'd be worthwhile noting such issues that
>>>> have been found with deployments of ICE here, as any protocol using
>>>> ICE and accepting non locally configured STUN/TURN URLs may have
>>>> issues like that. For example, a recent paper [3] also describes
>>>> some attacks (in section 4.2 mostly) that could (I guess) be
>>>> mounted against any ICE agent and not only WebRTC clients. That'd
>>>> be worth a reference and maybe thinking about which attacks are
>>>> generic ICE issues and don't only affect WebRTC.
>>>>
>>>> [3] https://doi.org/10.1145/3019612.3019844
>>>
>>> I am struggling to figure out exactly what to do here... I really
>>> hope we don't have to perfom a study on [3], and see what is general,=

>>> and what is WebRTC-specific. Are we even allowed to reference [3], as=

>>> it's not freely available?
>>
>> Sure, we can reference academic papers behind paywalls, and
>> there's often another version available that's not. (Not sure
>> in this case.)
>>
>>>
>>> Some help and guidance would be appreciated :)
>>
>> I guess about as much as can be done with this -bis effort is
>> to note where any leakages have been found. There's been some
>> recent traffic on the W3C WebRTC list about that I think, (in
>> the thread about CSP iirc) so maybe a trawl of that thread
>> will suggest some text?
>=20
> I did follow that discussion. I will take a second look.
>=20
> ---
>=20
>>>> - I also wondered if I can fingerprint a host based on how it does
>>>> ICE? I  suspect that might work, but haven't tried to figure out
>>>> details.
>>>>
>>>> - Could I probe an internal network based on feeding it candidates
>>>> to check? E.g. checking timing of reactions.  If I could that seems
>>>> noteworthy.
>>>
>>> Something like?
>>>
>>> "Based on the types of candidates provided by the peer, and the
>>> results of the connectivity tests performed Against those candidates,=

>>> an agent might be able to determine characteristics of the peer
>>> network."
>>
>> Maybe:
>>
>> "Based on the types of candidates provided by the peer, and the
>> results of the connectivity tests performed against those candidates,
>> the peer might be able to determine characteristics of the local
>> network, e.g. if different timings are apparent to the peer. In
>> the limit the peer might be able to probe the local network."
>>
>> That said - I'm not claiming this is possible for-sure, I just
>> bet it would be:-)
>=20
> The text looks good.
>=20
> ---
>=20
>>>> (2) 5.3: "...MUST contain ... <foo> bits of randomness" Don't you
>>>> need to say when these values MUST be different and when they're ok
>>>> to be re-used? I forget if STUN/TURN do that.
>>>
>>> Section 7.2.2 says:
>>>
>>> "A connectivity check Binding request MUST utilize the STUN
>>> short-term credential mechanism."
>>>
>>> RFC 5389 (STUN) says:
>>>
>>> "Short-Term Credential:  A temporary username and associated
>>> password that represent a shared secret between client and server.
>>> Short- term credentials are obtained through some kind of protocol
>>> mechanism between the client and server, preceding the STUN exchange.=

>>> A short-term credential has an explicit temporal scope, which may be
>>> based on a specific amount of time (such as 5 minutes) or on an event=

>>> (such as termination of a SIP dialog). The specific scope of a
>>> short-term credential is defined by the application usage."
>>>
>>> If anything extra is needed, I think that should be done as an update=

>>> to STUN.
>>
>> Not sure I agree - maybe I wasn't clear in my comment though,
>> so let me try rephrase it.
>>
>> STUN doesn't define the duration for which short-term creds
>> are OK to be used. ICE does define a session concept therefore
>> ICE ought to say if short term STUN creds MUST/MUST-NOT/MAY
>> (or whatever) be re-used in different ICE sessions. Even
>> within an ICE session I guess in theory one could require
>> different short-term STUN credentials every single time, or
>> not. So I do think there's something to be said here.
>=20
> Section 9 says that an agent must create a new username fragment and
> password for every new ICE session:
>=20
>      "To restart ICE, an agent MUST change both the password and the
>       username fragment for the data stream(s) being restarted.=C2=B2
>=20
>=20
> Since I also uses the username to identity the ICE session, the values
> cannot be changed within a session.
>=20
> There is no text on when a value can be re-used - apart from the fact t=
hat
> they cannot be re-used when an ICE restart takes place.
>=20
> My assumption has been that the randomness criteria are assumed to ensu=
re
> that two agents don=C2=B9t choose the same values for the same session,=
 and
> that values are unlikely to be re-used within a short period of time.
>=20
> We could say that agents shall verify that the same value is not re-use=
d
> as long as packets from a previous ICE session may still be present in =
the
> network. But, that is not really security related, but more to make sur=
e
> ICE works.
>=20
> ---
>=20
>>>
>>>> (Also - the phrasing isn't that great - how do I "contain"
>>>> randomness? But that's just a nit.)
>>>
>>> Do you have a suggestion for a better word?
>>
>> I think what you want is to say "unguessable, with at
>> least 128 bits of random number generator output used
>> to generate each" or something like that? It's a hard
>> one to get right, but even what you have isn't that
>> bad (I did say this was a nit:-)
>=20
> What about?
>=20
>      "Username Fragment and Password:  Values used to perform connectiv=
ity
>       checks. The values MUST be unguessable, with at least 128 bits of=

> random=20
>       number generator output used to generate the password, and at lea=
st
> 24=20
>       bits output to generate the username fragment."
>=20
>=20
> Thanks! :)
>=20
> Regards,
>=20
> Christer
>=20
>=20
>>>
>>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D
>>>
>>> Nits:
>>>
>>>> I took a look at the diff [4] between this and 5245, but that
>>>> wasn't really that useful, so this review is based on a read of the
>>>> draft without comparing it to 5245. Apologies if that causes me to
>>>> comment on text that's unchanged - in such cases, I think it's fine
>>>> to not heed those particular comments.
>>>>
>>>> [4]
>>>>
>>>> https://tools.ietf.org/rfcdiff?url1=3Drfc5245&url2=3Ddraft-ietf-ice-=
rfc5245b
>>>> is-16.txt
>>>>
>>>>
>>>>
>> - 2.1: Why "only UDP specified here"? Does that include QUIC which is
>>>> UDP-based, but not UDP? I assume so.
>>>
>>> There is a separate specification, RFC 6544, for TCP based
>>> candidates.
>>>
>>> Regarding QUIC, I don't know. QUIC wasn't discussed during the work,
>>> but how/if the procedures also apply to QUIC without any
>>> modifications etc I don't know.
>>>
>>>> - 2.3: how the controlling/controlled stuff works isn't clear from
>>>> this, nor even (as I was reading it) in section 7.3.1.1 - I wasn't
>>>> clear how the tie-breaker value is initialised until I got to
>>>> 16.1. In any case I think a bit more explanatory text in 2.3 might
>>>> be good. (But if implementers haven't had a problem with this,
>>>> maybe it's just me.)
>>>
>>> In general, one of the tasks of the bis work was to *simplify*
>>> section 2, because the previous version was too detailed for
>>> non-implementers who just want to figure out what ICE is all about
>>> (in order to  actually implement ICE, reading section 2 is obviously
>>> not enough). For that reason, my opinion was that section 2 doesn't
>>> really need to talk about role conflicts and tie-breaker values, as
>>> it's not essential for a high-level description of ICE.
>>>
>>> ---
>>>
>>>> - 5.2: "The procedures in this section is common across the
>>>> initiating and responding agents." s/is/are/ I guess?
>>>
>>> Yes. I will fix as suggested.
>>>
>>> ---
>>>
>>>> - 6.1.1: What is "3PCC"? That note could maybe also do with a
>>>> reference, as I at least don't get what you're trying to tell me.
>>>> Ah - it's 3rd party call control (mentioned in 7.3.1.1).
>>>
>>> I can use "3PCC (3rd Party Call Control)" in section 6.1.1.
>>>
>>> As the spec is protocol independent, I don't think there are any
>>> references that can be added.
>>>
>>> ---
>>>
>>>> - 16.1: For a given ICE session, are the random numbers in the
>>>> ICE-CONTROLLED and ICE-CONTROLLING attributes sent by the same
>>>> agent supposed to have the same value? I wasn't clear. If they are
>>>> the same, I understand how tie-breaking happens. If they can
>>>> differ, I'm not sure. (But I didn't go back and re-read 7.3.1.1, so
>>>> it may be ok either way:-)
>>>
>>> It is covered in the 2nd paragraph of section 7.2.5.1, which says
>>> that the agent MAY change the value when it switches role.
>>>
>>>> In any case saying "referred to as the tie-breaker value" twice
>>>> seems odd.
>>>
>>> I'll remove it from the ICE-CONTROLLING definition.
>>>
>>> ---
>>>
>>>> - 16.1: (mega-mega-nit:-) the fact that tie-breaker is split over
>>>> a line-breaker here is why I didn't find this when I was reading
>>>> 2.3/7.3.1.1 - maybe tweak the words so a grep will find it?)
>>>
>>> Good catch. I'll fix it.
>>>
>>> It would be really cool if search functions could discard line-breaks=

>>> when searching for strings.
>>>
>>> ---
>>>
>>>> - 17: "looking to deploy ICE" is a bit confusing - do you mean
>>>> "looking to be nice to ICE"? My assumption is that endpoints deploy
>>>> ICE agents but network operators don't, though they might deploy
>>>> STUN/TURN servers I guess. But maybe I'm thinking too much about
>>>> WebRTC there.
>>>
>>> Perhaps something like:
>>>
>>> "This section discusses issues relevant to operators operating
>>> networks where ICE will be used by endpoints."
>>>
>>> ---
>>>
>>>> - 18: I wondered if this is still needed, given that 5245 already
>>>> said it (I didn't check if the text has been updated). Saying this
>>>> once would seem sufficient to me anyway. I guess leaving it in is
>>>> the easier path.
>>>
>>> I'll leave it :)
>>>
>>> ---
>>>
>>>> - 19: s/DNS-SEC/DNSSEC/ would be more common
>>>
>>> I will fix as suggested.
>>>
>>> ---
>>>
>>>> - 19.4.1: 1st sentence if missing a "T" - s/he/The/
>>>
>>> I will fix as suggested.
>>>
>>> ---
>>>
>>> Regards,
>>>
>>> Christer
>>>
>>
>> --=20
>> PGP key change time for me.
>> New-ID 7B172BEA; old-ID 805F8DA2 expires Jan 24 2018.
>> NewWithOld sigs in keyservers.
>> Sorry if that mucks something up;-)
>=20
>=20

--=20
PGP key change time for me.
New-ID 7B172BEA; old-ID 805F8DA2 expires Jan 24 2018.
NewWithOld sigs in keyservers.
Sorry if that mucks something up;-)

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Subject: [secdir] Secdir review of draft-ietf-mtgvenue-iaoc-venue-selection-process-11
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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 com=
ments 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 details the IETF's Meeting Venue Selection Process from the p=
erspective of the community's goals, criteria and thought processes. It poi=
nts to additional process documents on the IAOC Web Site that go into furth=
er detail and are subject to change with experience. This note proposes no =
protocols, and therefore no new protocol insecurities.

So, no additional comments.=20

Cheers

Dacheng


From nobody Wed Jan 31 06:42:41 2018
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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-ice-rfc5245bis.all@ietf.org" <draft-ietf-ice-rfc5245bis.all@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "ice@ietf.org" <ice@ietf.org>
Thread-Topic: Secdir last call review of draft-ietf-ice-rfc5245bis-16
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Date: Wed, 31 Jan 2018 14:39:12 +0000
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Subject: Re: [secdir] Secdir last call review of draft-ietf-ice-rfc5245bis-16
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Review instructions and related resources are at:
http://tools.ietf.org/area/sec/trac/wiki/SecDirReview

For telechat 2018-02-08

Reviewer               LC end     Draft
Derek Atkins           2018-01-31 draft-ietf-bier-mvpn-09
Donald Eastlake        2018-01-31 draft-farrel-sfc-convent-05
Ólafur Guðmundsson     2018-02-07 draft-ietf-tls-dnssec-chain-extension-06
Steve Hanna            2018-02-05 draft-ietf-trill-ecn-support-04
Dan Harkins            2018-02-05 draft-ietf-trill-address-flush-05
Brian Weis            R2018-01-26 draft-ietf-idr-bgp-prefix-sid-11
Taylor Yu              2018-01-31 draft-ietf-rtgwg-lne-model-05

For telechat 2018-02-22

Reviewer               LC end     Draft
Tobias Gondrom         None       draft-ietf-sacm-nea-swima-patnc-01
Leif Johansson         None       draft-ietf-nvo3-hpvr2nve-cp-req-13
Benjamin Kaduk         2018-02-14 draft-ietf-rtgwg-backoff-algo-07
Scott Kelly            2018-02-09 draft-ietf-bess-fat-pw-bgp-03
Stephen Kent           2018-02-09 draft-ietf-bess-evpn-usage-07
Tero Kivinen           2018-02-09 draft-ietf-bess-dci-evpn-overlay-07

For telechat 2018-03-08

Reviewer               LC end     Draft
Daniel Gillmor         None       draft-gutmann-scep-08

Last calls:

Reviewer               LC end     Draft
John Bradley           None       draft-ietf-acme-acme-09
Christian Huitema      None       draft-ietf-bfd-yang-09
Charlie Kaufman        2018-02-14 draft-ietf-mmusic-sdp-bundle-negotiation-48
Russ Mundy             2017-09-14 draft-spinosa-urn-lex-12

Early review requests:

Reviewer               Due        Draft
Daniel Franke          2018-01-31 draft-ietf-intarea-provisioning-domains-00
Ólafur Guðmundsson     2018-01-09 draft-ietf-opsawg-nat-yang-09

Next in the reviewer rotation:

  Watson Ladd
  Ben Laurie
  Barry Leiba
  Chris Lonvick
  David Mandelberg
  Catherine Meadows
  Alexey Melnikov
  Daniel Migault
  Matthew Miller
  Adam Montville

