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From: The IESG <iesg-secretary@ietf.org>
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Subject: [straw] EXTENSION of Last Call: <draft-ietf-straw-b2bua-dtls-srtp-08.txt> (DTLS-SRTP Handling in Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)) to Proposed Standard
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The IESG has received a request from the Sip Traversal Required for
Applications to Work WG (straw) to consider the following document:
- 'DTLS-SRTP Handling in Session Initiation Protocol (SIP) Back-to-Back
   User Agents (B2BUAs)'
  <draft-ietf-straw-b2bua-dtls-srtp-08.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2015-11-17.  Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.

Abstract


   Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
   often act on the media plane, rather than just on the signaling path.
   This document describes the behavior such B2BUAs can adhere to when
   acting on the media plane that uses an Secure Real-time Transport
   (SRTP) security context set up with the Datagram Transport Layer
   Security (DTLS) protocol.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-straw-b2bua-dtls-srtp/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-straw-b2bua-dtls-srtp/ballot/


No IPR declarations have been submitted directly on this I-D.



From nobody Tue Nov 17 01:11:00 2015
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Ben Campbell <ben@nostrum.com>, "straw@ietf.org" <straw@ietf.org>, "draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org" <draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org>
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--_003_D270EC57494B9rmohanrciscocom_
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Hi Ben,

Thanks for your feedback. Please see diffs attached. Also see inline



-----Original Message-----
From: Ben Campbell <ben@nostrum.com>
Date: Tuesday, 27 October 2015 at 8:19 AM
To: "straw@ietf.org" <straw@ietf.org>,
"draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org"
<draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org>
Subject: Re: [straw] I-D Action: draft-ietf-straw-b2bua-dtls-srtp-08.txt

>Hi,
>
>This version addresses many of my comments. I'm going to go ahead and
>send start the IETF last call process.  I do have a few new or remaining
>comments, but these can be handled with along with other IETF last call
>comments.
>
>Thanks!
>
>Ben.
>
>- 1.2, last paragraph:
>
>The first sentence still contains a MUST that I thought was going to go
>away. Ram proposed the following, that did not seem to make it into the
>draft:
>
>"The following sections describe the behavior B2BUAs can follow to avoid
>breaking end-to-end DTLS-SRTP sessions. B2BUAs terminating DTLS-SRTP
>session are outside the scope of this document."

Missed to add. Now added this statement.



>
>I like  non-normative explanation of why you normally can't terminate
>DTLS-SRTP. But I note several other places where the draft still says
>that a b2bua MUST NOT terminate dtls-srtp. I don't think the normative
>MUST is necessary, or appropriate, as it basically tries to put
>normative requirements on b2buas that do not implement this draft.

I have removed the other normative references as well. Please have a look
at the diff and let me know if its ok.

>
>- 3.1.1, 2nd paragraph under figure 1: "... advertised to Bob in the
>    SIP offer before it receives a SIP answer from Bob ... "
>
>Should SIP offer and SIP answer be SDP offer and SDP answer?

Yes, I have fixed it now.

>
>- 3.1.1, last paragraph:
>
>Section 5 of RFC4474 and 4474bis are not the same. I _think_ section 5
>is correct for 4474, but the section number seems to be the same as from
>before when the reference was 4474bis. Please confirm the reference
>points to the right section.

Section 5 of RFC 4474 defines the procedures for how a sender (Alice) or a
authentication service in senders domain can sign and generate the
identity header and that is what we intend to refer. So I think this looks
fine.


>
>- 3.1.2: "The identity
>    integrity protection procedures described in Security Considerations
>    section MUST be used by the endpoint or the proxy server in the
>    endpoints network to detect malicious B2BUAs that attempt to
>    terminate the DTLS-SRTP session."
>
>I think this is still not quite right. This draft is not about
>endpoints, and therefore can't really introduce normative requirements
>on the endpoints (except for the case the endpoint is a B2BUA.). To do
>so would require updating 3261 and a bunch of other specs. This needs to
>be stated non-normatively, and the security considerations already do
>that.

Fixed the sentence above in 3.1.2 now.


>
>"...generate the identity..."
>
>I think this should say "generate the signature in the Identity header
>field"

 fixed this now

>
>- 3.1.2.1 and 3.1.2.2
>
>These sections seem to say the same thing with different levels of
>detail, including repetition of the "MUST NOT terminate dtls-srtp" bit.
>Can they be combined?

Prefer to keep them separate as they talk about different classes of B2BUA
(one that inspects at RTP header level and RTCP and one that also inspects
and modifies the headers).
Let me know if you think otherwise.



Regards,
Ram

>
>
>
>On 19 Oct 2015, at 11:09, internet-drafts@ietf.org wrote:
>
>> A New Internet-Draft is available from the on-line Internet-Drafts
>> directories.
>> This draft is a work item of the Sip Traversal Required for
>> Applications to Work Working Group of the IETF.
>>
>>      Title           : DTLS-SRTP Handling in Session Initiation
>> Protocol (SIP) Back-to-Back User Agents (B2BUAs)
>>      Authors         : Ram Mohan Ravindranath
>>                        Tirumaleswar Reddy
>>                        Gonzalo Salgueiro
>>                        Victor Pascual
>>                        Parthasarathi Ravindran
>> 	Filename        : draft-ietf-straw-b2bua-dtls-srtp-08.txt
>> 	Pages           : 12
>> 	Date            : 2015-10-19
>>
>> Abstract:
>> Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
>> often act on the media plane, rather than just on the signaling path.
>> This document describes the behavior such B2BUAs can adhere to when
>> acting on the media plane that uses an Secure Real-time Transport
>> (SRTP) security context set up with the Datagram Transport Layer
>> Security (DTLS) protocol.
>>
>>
>> The IETF datatracker status page for this draft is:
>> https://datatracker.ietf.org/doc/draft-ietf-straw-b2bua-dtls-srtp/
>>
>> There's also a htmlized version available at:
>> https://tools.ietf.org/html/draft-ietf-straw-b2bua-dtls-srtp-08
>>
>> A diff from the previous version is available at:
>> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-straw-b2bua-dtls-srtp-08
>>
>>
>> Please note that it may take a couple of minutes from the time of
>> submission
>> until the htmlized version and diff are available at tools.ietf.org.
>>
>> Internet-Drafts are also available by anonymous FTP at:
>> ftp://ftp.ietf.org/internet-drafts/
>>
>> _______________________________________________
>> straw mailing list
>> straw@ietf.org
>> https://www.ietf.org/mailman/listinfo/straw


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--_003_D270EC57494B9rmohanrciscocom_--


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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: "Vijay K. Gurbani" <vkg@bell-labs.com>, "draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org" <draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org>, "straw@ietf.org" <straw@ietf.org>
Thread-Topic: APPSDIR review of draft-ietf-straw-b2bua-dtls-srtp-08.txt
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Date: Tue, 17 Nov 2015 09:17:19 +0000
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Hi Vijay,

Thanks for your review and feedback. Please see inline

-----Original Message-----
From: "Vijay K. Gurbani" <vkg@bell-labs.com>
Date: Tuesday, 17 November 2015 at 3:01 AM
To: "draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org"
<draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org>
Cc: "apps-discuss@ietf.org" <apps-discuss@ietf.org>, "iesg@ietf.org"
<iesg@ietf.org>
Subject: APPSDIR review of draft-ietf-straw-b2bua-dtls-srtp-08.txt
Resent-From: <vkg@bell-labs.com>
Resent-To: <draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org>
Resent-Date: Tuesday, 17 November 2015 at 3:01 AM

>I have been selected as the Applications Area Directorate early
>reviewer for this draft (for background on appsdir, please see
>http://trac.tools.ietf.org/area/app/trac/wiki/ApplicationsAreaDirectorate)
>.
>
>Please resolve these comments along with any other Last Call comments
>you may receive. Please wait for direction from your document shepherd
>or AD before posting a new version of the draft.
>
>Document: draft-ietf-straw-b2bua-dtls-srtp-08.txt
>Title: DTLS-SRTP Handling in Session Initiation Protocol (SIP)
>        Back-to-Back User Agents (B2BUAs)
>Reviewer: Vijay K. Gurbani
>Review Date: 2015-11-16
>IETF Last Call Date: 2015-11-17
>IESG Telechat Date: 2015-12-03
>
>Summary: This draft has minor issues, and is ready for publication as
>a Proposed Standard once these issues are resolved.
>
>I will also (strongly) suggest that the editors go over the draft for
>grammatical touches to eliminate the sort of issues present in the Nits
>section.  This will make the draft more readable and provide it the
>gravity it needs for a standards track document.
>
>Major: 0
>Minor: 3
>Nits: Many
>
>Minor:
>
>- S3.1.1, second to last paragraph (beginning with "[RFC4474] provides
>  ... the signature."): Isn't this only true if the originating UAC
>  used rfc4474 and inserted the appropriate headers.  Or is the
>  assumption that rfc4474 is always used, and therefore, a media relay
>  B2BUA must be careful and not modify the fingerprints?

Right. This is true only when RFC4474 is used.
We have re-worded the text to say the same. Here is the proposed new text:

NEW:
"When <xref target=3D"RFC4474"/> is used forDTLS-SRTP sessions, the
fingerprint attributes are integrity protected.
Thus, under circumstances when <xref target=3D"RFC4474"/> is used, B2BUAs
cannot terminate the DTLS-SRTP session without invalidating the signature
and
causing the session to fail.


>
>- S3.1.2, first paragraph: "The identity integrity protection
>  procedures described in Security Considerations section..."
>
>  Described in the Security Consideration section of which document?
>  The document under review or some other one (rfc7092)?

Described in section 5 (Security Consideration) of this document. I will
re-word to say the same.

>
>- S3.1.2.2: I am not sure what your takeaway is at the end of this
>  section.  You seem to be making the case that a B2BUA cannot
>  modify the RTP headers and RTCP packets.  But then you go on and
>  say that this can be mitigated by using different keys, and that
>  with "such an approach" (aside: define "such an approach"), the
>  B2BUA is not aware of the keys used to decrypt the media payload.
>  Well, the B2BUA is never aware of such keys, since they are
>  negotiated end-to-end (over the B2BUA), so I am at a loss to see
>  what is the point of this section.

The idea of the section is to highlight that with current mechanisms it is
not possible for B2BUA modify headers with out being a DTLS endpoint.
In future (with PERC) it is possible that a B2BUA can modify the
headers/RTCP packets but still have no access to the RTP payload.


>
>Nits:
>
>- Abstract: s/media plane, rather than/media plane rather than
>
>- Abstract: s/This document describes the behavior such B2BUAs can
>   adhere to/This document describes the behaviour of such B2BUAs/
>
>- S1.1: s/The fingerprint, identifies/The fingerprint identifies
>
>- S3.1.2:
>  s/There are two types of media-aware relay/There are two types of
>  media-aware relays/
>
>- S3.1.2.1: (For readability)
>  s/This kind of media aware relay/A RTP/RTCP aware media relay/
>
>- S4: s/B2BUA replaces the Bob's/B2BUA replaces Bob's/

Thanks. Will fix all the above Nits

Regards,
Ram

>
>  (If you want to retain "the", perhaps you may consider renaming
>  Bob to Donald!  Sorry, bad joke, I know.)
>
>Thanks,
>
>- vijay
>--=20
>Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent
>1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60563 (USA)
>Email: vkg@{bell-labs.com,acm.org} / vijay.gurbani@alcatel-lucent.com
>Web: http://ect.bell-labs.com/who/vkg/  | Calendar: http://goo.gl/x3Ogq


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From: "Romascanu, Dan (Dan)" <dromasca@avaya.com>
To: "ops-dir@ietf.org" <ops-dir@ietf.org>
Thread-Topic: OPS-DIR review of draft-ietf-straw-b2bua-dtls-srtp-08
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Subject: [straw] OPS-DIR review of draft-ietf-straw-b2bua-dtls-srtp-08
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Hi,


I have reviewed draft-ietf-straw-b2bua-dtls-srtp-08 as part of the Operatio=
nal directorate's ongoing effort to review all IETF documents being process=
ed by the IESG.  These comments were written with the intent of improving t=
he operational aspects of the IETF drafts. Comments that are not addressed =
in last call may be included in AD reviews during the IESG review.  Documen=
t editors and WG chairs should treat these comments just like any other las=
t call comments.



I believe the document is 'Ready' for publication.



The document describes the behavior of media plane B2BUAs when using an SRT=
P security context set up with the DTLS protocol. The target audience is ma=
inly the implementers of B2BUAs, and although the document may be an intere=
sting reading for operators deploying B2BUAs, its content has no direct ope=
rational impact. Although not mentioned in this document I assume that aspe=
cts of operation and manageability of B2BUAs are dealt with in other WG doc=
uments which apply here as well.



I have seen a few editorial nits, but I do not believe that it's the role o=
f an OPS-DIR review to raise them. The RFC Editor will certainly catch thes=
e and more. I will just mention one observation about the title. The docume=
nt deals with a subset of the B2BUAs - those who act on the media plane. Wh=
y does not the title mention this (insert 'media') to ease search and make =
the scope more clear?



Regards,



Dan





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<p class=3D"MsoNormal">Hi,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I have reviewed draft-ietf-straw-b2bua-dtls-srtp-=
08 as part of the Operational directorate's ongoing effort to review all IE=
TF documents being processed by the IESG.&nbsp; These comments were written=
 with the intent of improving the operational
 aspects of the IETF drafts. Comments that are not addressed in last call m=
ay be included in AD reviews during the IESG review.&nbsp; Document editors=
 and WG chairs should treat these comments just like any other last call co=
mments.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I believe the document is 'Ready' for publication=
.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">The document describes the behavior of media plan=
e B2BUAs when using an SRTP security context set up with the DTLS protocol.=
 The target audience is mainly the implementers of B2BUAs, and although the=
 document may be an interesting reading
 for operators deploying B2BUAs, its content has no direct operational impa=
ct. Although not mentioned in this document I assume that aspects of operat=
ion and manageability of B2BUAs are dealt with in other WG documents which =
apply here as well.
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I have seen a few editorial nits, but I do not be=
lieve that it&#8217;s the role of an OPS-DIR review to raise them. The RFC =
Editor will certainly catch these and more. I will just mention one observa=
tion about the title. The document deals
 with a subset of the B2BUAs &#8211; those who act on the media plane. Why =
does not the title mention this (insert &#8216;media&#8217;) to ease search=
 and make the scope more clear?
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Dan<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: "Romascanu, Dan (Dan)" <dromasca@avaya.com>, "ops-dir@ietf.org" <ops-dir@ietf.org>
Thread-Topic: OPS-DIR review of draft-ietf-straw-b2bua-dtls-srtp-08
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Subject: Re: [straw] OPS-DIR review of draft-ietf-straw-b2bua-dtls-srtp-08
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Hi Dan,

Thanks for your review and feedback. Regarding changing title I don't have =
any strong opinion. I would prefer to leave it that way it is.

Regards,
Ram

From: "Romascanu, Dan (Dan)" <dromasca@avaya.com<mailto:dromasca@avaya.com>=
>
Date: Tuesday, 17 November 2015 at 6:19 PM
To: "ops-dir@ietf.org<mailto:ops-dir@ietf.org>" <ops-dir@ietf.org<mailto:op=
s-dir@ietf.org>>
Cc: "draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org<mailto:draft-ietf-=
straw-b2bua-dtls-srtp.all@tools.ietf.org>" <draft-ietf-straw-b2bua-dtls-srt=
p.all@tools.ietf.org<mailto:draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf=
.org>>, "straw@ietf.org<mailto:straw@ietf.org>" <straw@ietf.org<mailto:stra=
w@ietf.org>>
Subject: OPS-DIR review of draft-ietf-straw-b2bua-dtls-srtp-08
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Resent-To: <draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org<mailto:draft-ietf=
-straw-b2bua-dtls-srtp.all@ietf.org>>
Resent-Date: Tuesday, 17 November 2015 at 6:20 PM

Hi,


I have reviewed draft-ietf-straw-b2bua-dtls-srtp-08 as part of the Operatio=
nal directorate's ongoing effort to review all IETF documents being process=
ed by the IESG.  These comments were written with the intent of improving t=
he operational aspects of the IETF drafts. Comments that are not addressed =
in last call may be included in AD reviews during the IESG review.  Documen=
t editors and WG chairs should treat these comments just like any other las=
t call comments.



I believe the document is 'Ready' for publication.



The document describes the behavior of media plane B2BUAs when using an SRT=
P security context set up with the DTLS protocol. The target audience is ma=
inly the implementers of B2BUAs, and although the document may be an intere=
sting reading for operators deploying B2BUAs, its content has no direct ope=
rational impact. Although not mentioned in this document I assume that aspe=
cts of operation and manageability of B2BUAs are dealt with in other WG doc=
uments which apply here as well.



I have seen a few editorial nits, but I do not believe that it's the role o=
f an OPS-DIR review to raise them. The RFC Editor will certainly catch thes=
e and more. I will just mention one observation about the title. The docume=
nt deals with a subset of the B2BUAs - those who act on the media plane. Wh=
y does not the title mention this (insert 'media') to ease search and make =
the scope more clear?



Regards,



Dan





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e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami=
ly: Calibri, sans-serif;">
<div>Hi Dan,</div>
<div><br>
</div>
<div>Thanks for your review and feedback. Regarding changing title I don&#8=
217;t have any strong opinion. I would prefer to leave it that way it is.</=
div>
<div><br>
</div>
<div>Regards,</div>
<div>Ram</div>
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<div style=3D"font-family:Calibri; font-size:11pt; text-align:left; color:b=
lack; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM:=
 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid;=
 BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style=3D"font-weight:bold">From: </span>&quot;Romascanu, Dan (Dan)&qu=
ot; &lt;<a href=3D"mailto:dromasca@avaya.com">dromasca@avaya.com</a>&gt;<br=
>
<span style=3D"font-weight:bold">Date: </span>Tuesday, 17 November 2015 at =
6:19 PM<br>
<span style=3D"font-weight:bold">To: </span>&quot;<a href=3D"mailto:ops-dir=
@ietf.org">ops-dir@ietf.org</a>&quot; &lt;<a href=3D"mailto:ops-dir@ietf.or=
g">ops-dir@ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Cc: </span>&quot;<a href=3D"mailto:draft-i=
etf-straw-b2bua-dtls-srtp.all@tools.ietf.org">draft-ietf-straw-b2bua-dtls-s=
rtp.all@tools.ietf.org</a>&quot; &lt;<a href=3D"mailto:draft-ietf-straw-b2b=
ua-dtls-srtp.all@tools.ietf.org">draft-ietf-straw-b2bua-dtls-srtp.all@tools=
.ietf.org</a>&gt;,
 &quot;<a href=3D"mailto:straw@ietf.org">straw@ietf.org</a>&quot; &lt;<a hr=
ef=3D"mailto:straw@ietf.org">straw@ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>OPS-DIR review of draft-ie=
tf-straw-b2bua-dtls-srtp-08<br>
<span style=3D"font-weight:bold">Resent-From: </span>&lt;<a href=3D"mailto:=
dromasca@avaya.com">dromasca@avaya.com</a>&gt;<br>
<span style=3D"font-weight:bold">Resent-To: </span>&lt;<a href=3D"mailto:dr=
aft-ietf-straw-b2bua-dtls-srtp.all@ietf.org">draft-ietf-straw-b2bua-dtls-sr=
tp.all@ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Resent-Date: </span>Tuesday, 17 November 2=
015 at 6:20 PM<br>
</div>
<div><br>
</div>
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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I have reviewed draft-ietf-straw-b2bua-dtls-srtp-=
08 as part of the Operational directorate's ongoing effort to review all IE=
TF documents being processed by the IESG.&nbsp; These comments were written=
 with the intent of improving the operational
 aspects of the IETF drafts. Comments that are not addressed in last call m=
ay be included in AD reviews during the IESG review.&nbsp; Document editors=
 and WG chairs should treat these comments just like any other last call co=
mments.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I believe the document is 'Ready' for publication=
.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">The document describes the behavior of media plan=
e B2BUAs when using an SRTP security context set up with the DTLS protocol.=
 The target audience is mainly the implementers of B2BUAs, and although the=
 document may be an interesting reading
 for operators deploying B2BUAs, its content has no direct operational impa=
ct. Although not mentioned in this document I assume that aspects of operat=
ion and manageability of B2BUAs are dealt with in other WG documents which =
apply here as well.
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I have seen a few editorial nits, but I do not be=
lieve that it&#8217;s the role of an OPS-DIR review to raise them. The RFC =
Editor will certainly catch these and more. I will just mention one observa=
tion about the title. The document deals
 with a subset of the B2BUAs &#8211; those who act on the media plane. Why =
does not the title mention this (insert &#8216;media&#8217;) to ease search=
 and make the scope more clear?
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Dan<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
</div>
</span>
</body>
</html>

--_000_D2723301497BArmohanrciscocom_--


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From: "Romascanu, Dan (Dan)" <dromasca@avaya.com>
To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>, "ops-dir@ietf.org" <ops-dir@ietf.org>
Thread-Topic: OPS-DIR review of draft-ietf-straw-b2bua-dtls-srtp-08
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Subject: Re: [straw] OPS-DIR review of draft-ietf-straw-b2bua-dtls-srtp-08
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Hi Ram,

No strong opinion either about the title. I believe that being more exact i=
s better, but this is certainly not a show stopper and definitely not an op=
erational issue.

Thanks and Regards,

Dan


From: straw [mailto:straw-bounces@ietf.org] On Behalf Of Ram Mohan R (rmoha=
nr)
Sent: Wednesday, November 18, 2015 10:19 AM
To: Romascanu, Dan (Dan); ops-dir@ietf.org
Cc: draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org; straw@ietf.org
Subject: Re: [straw] OPS-DIR review of draft-ietf-straw-b2bua-dtls-srtp-08

Hi Dan,

Thanks for your review and feedback. Regarding changing title I don't have =
any strong opinion. I would prefer to leave it that way it is.

Regards,
Ram

From: "Romascanu, Dan (Dan)" <dromasca@avaya.com<mailto:dromasca@avaya.com>=
>
Date: Tuesday, 17 November 2015 at 6:19 PM
To: "ops-dir@ietf.org<mailto:ops-dir@ietf.org>" <ops-dir@ietf.org<mailto:op=
s-dir@ietf.org>>
Cc: "draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org<mailto:draft-ietf-=
straw-b2bua-dtls-srtp.all@tools.ietf.org>" <draft-ietf-straw-b2bua-dtls-srt=
p.all@tools.ietf.org<mailto:draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf=
.org>>, "straw@ietf.org<mailto:straw@ietf.org>" <straw@ietf.org<mailto:stra=
w@ietf.org>>
Subject: OPS-DIR review of draft-ietf-straw-b2bua-dtls-srtp-08
Resent-From: <dromasca@avaya.com<mailto:dromasca@avaya.com>>
Resent-To: <draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org<mailto:draft-ietf=
-straw-b2bua-dtls-srtp.all@ietf.org>>
Resent-Date: Tuesday, 17 November 2015 at 6:20 PM

Hi,


I have reviewed draft-ietf-straw-b2bua-dtls-srtp-08 as part of the Operatio=
nal directorate's ongoing effort to review all IETF documents being process=
ed by the IESG.  These comments were written with the intent of improving t=
he operational aspects of the IETF drafts. Comments that are not addressed =
in last call may be included in AD reviews during the IESG review.  Documen=
t editors and WG chairs should treat these comments just like any other las=
t call comments.



I believe the document is 'Ready' for publication.



The document describes the behavior of media plane B2BUAs when using an SRT=
P security context set up with the DTLS protocol. The target audience is ma=
inly the implementers of B2BUAs, and although the document may be an intere=
sting reading for operators deploying B2BUAs, its content has no direct ope=
rational impact. Although not mentioned in this document I assume that aspe=
cts of operation and manageability of B2BUAs are dealt with in other WG doc=
uments which apply here as well.



I have seen a few editorial nits, but I do not believe that it's the role o=
f an OPS-DIR review to raise them. The RFC Editor will certainly catch thes=
e and more. I will just mention one observation about the title. The docume=
nt deals with a subset of the B2BUAs - those who act on the media plane. Wh=
y does not the title mention this (insert 'media') to ease search and make =
the scope more clear?



Regards,



Dan





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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Ram,<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">No strong opinion eith=
er about the title. I believe that being more exact is better, but this is =
certainly not a show stopper and definitely not an operational issue.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks and Regards,<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Dan<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> straw [m=
ailto:straw-bounces@ietf.org]
<b>On Behalf Of </b>Ram Mohan R (rmohanr)<br>
<b>Sent:</b> Wednesday, November 18, 2015 10:19 AM<br>
<b>To:</b> Romascanu, Dan (Dan); ops-dir@ietf.org<br>
<b>Cc:</b> draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org; straw@ietf.=
org<br>
<b>Subject:</b> Re: [straw] OPS-DIR review of draft-ietf-straw-b2bua-dtls-s=
rtp-08<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:black">Hi Dan,=
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:black"><o:p>&n=
bsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:black">Thanks =
for your review and feedback. Regarding changing title I don&#8217;t have a=
ny strong opinion. I would prefer to leave it that way it is.<o:p></o:p></s=
pan></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:black"><o:p>&n=
bsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:black">Regards=
,<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:black">Ram<o:p=
></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:black"><o:p>&n=
bsp;</o:p></span></p>
</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"color:black">From: </span></b><spa=
n style=3D"color:black">&quot;Romascanu, Dan (Dan)&quot; &lt;<a href=3D"mai=
lto:dromasca@avaya.com">dromasca@avaya.com</a>&gt;<br>
<b>Date: </b>Tuesday, 17 November 2015 at 6:19 PM<br>
<b>To: </b>&quot;<a href=3D"mailto:ops-dir@ietf.org">ops-dir@ietf.org</a>&q=
uot; &lt;<a href=3D"mailto:ops-dir@ietf.org">ops-dir@ietf.org</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:draft-ietf-straw-b2bua-dtls-srtp.all@too=
ls.ietf.org">draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org</a>&quot; =
&lt;<a href=3D"mailto:draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org">=
draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org</a>&gt;,
 &quot;<a href=3D"mailto:straw@ietf.org">straw@ietf.org</a>&quot; &lt;<a hr=
ef=3D"mailto:straw@ietf.org">straw@ietf.org</a>&gt;<br>
<b>Subject: </b>OPS-DIR review of draft-ietf-straw-b2bua-dtls-srtp-08<br>
<b>Resent-From: </b>&lt;<a href=3D"mailto:dromasca@avaya.com">dromasca@avay=
a.com</a>&gt;<br>
<b>Resent-To: </b>&lt;<a href=3D"mailto:draft-ietf-straw-b2bua-dtls-srtp.al=
l@ietf.org">draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org</a>&gt;<br>
<b>Resent-Date: </b>Tuesday, 17 November 2015 at 6:20 PM<o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:black"><o:p>&n=
bsp;</o:p></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">Hi,<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
<p class=3D"MsoPlainText"><span style=3D"color:black">I have reviewed draft=
-ietf-straw-b2bua-dtls-srtp-08 as part of the Operational directorate's ong=
oing effort to review all IETF documents being processed by the IESG.&nbsp;=
 These comments were written with the intent
 of improving the operational aspects of the IETF drafts. Comments that are=
 not addressed in last call may be included in AD reviews during the IESG r=
eview.&nbsp; Document editors and WG chairs should treat these comments jus=
t like any other last call comments.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">I believe the documen=
t is 'Ready' for publication.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">The document describe=
s the behavior of media plane B2BUAs when using an SRTP security context se=
t up with the DTLS protocol. The target audience is mainly the implementers=
 of B2BUAs, and although the document
 may be an interesting reading for operators deploying B2BUAs, its content =
has no direct operational impact. Although not mentioned in this document I=
 assume that aspects of operation and manageability of B2BUAs are dealt wit=
h in other WG documents which apply
 here as well. <o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">I have seen a few edi=
torial nits, but I do not believe that it&#8217;s the role of an OPS-DIR re=
view to raise them. The RFC Editor will certainly catch these and more. I w=
ill just mention one observation about the
 title. The document deals with a subset of the B2BUAs &#8211; those who ac=
t on the media plane. Why does not the title mention this (insert &#8216;me=
dia&#8217;) to ease search and make the scope more clear?
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">Dan<o:p></o:p></span>=
</p>
<p class=3D"MsoPlainText"><span style=3D"color:black">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
</div>
</div>
</div>
</div>
</body>
</html>

--_000_9904FB1B0159DA42B0B887B7FA8119CA6BE9DE0DAZFFEXMB04globa_--


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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Paul Wouters <paul@nohats.ca>, secdir <secdir@ietf.org>, "iesg@ietf.org" <iesg@ietf.org>, "draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org" <draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org>
Thread-Topic: Review of draft-ietf-straw-b2bua-dtls-srtp
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Date: Fri, 20 Nov 2015 03:37:37 +0000
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Subject: Re: [straw] Review of draft-ietf-straw-b2bua-dtls-srtp
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Hi Paul,

Thanks for your feedback. I will fix the broken link  to RFC7092 in
section 1.2. Thanks for pointing that out.

Regards,
Ram

-----Original Message-----
From: Paul Wouters <paul@nohats.ca>
Date: Friday, 20 November 2015 at 8:05 AM
To: secdir <secdir@ietf.org>, "iesg@ietf.org" <iesg@ietf.org>,
"draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org"
<draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org>
Subject: Review of draft-ietf-straw-b2bua-dtls-srtp
Resent-From: <paul@nohats.ca>
Resent-To: <draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org>
Resent-Date: Friday, 20 November 2015 at 8:05 AM

>
>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.
>
>As far as I understood the document and its dependancies (I'm not very
>familiar with the sip/srtp world), the document is Ready.
>
>One minor nit: Section 1.2 has a broken link for RFC-7092.
>
>This document describes how a "middle man" relaying connections between
>two sip endpoints should behave so it will not break the connection
>between the sip endpoints. The security section clearly lists the
>defenses the sip endpoints should take to ensure this "middle man" is
>not maliciously decrypting/re-encrypting the content of the connection
>it forwards between the endpoints.
>
>Paul


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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: "straw@ietf.org" <straw@ietf.org>, Ben Campbell <ben@nostrum.com>
Thread-Topic: [straw] Review of draft-ietf-straw-b2bua-dtls-srtp
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Subject: Re: [straw] Review of draft-ietf-straw-b2bua-dtls-srtp
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WG,

Please find the draft with comments received so far incorporated.

Regards,
Ram

-----Original Message-----
From: straw <straw-bounces@ietf.org> on behalf of Cisco Employee
<rmohanr@cisco.com>
Date: Friday, 20 November 2015 at 9:07 AM
To: Paul Wouters <paul@nohats.ca>, secdir <secdir@ietf.org>,
"iesg@ietf.org" <iesg@ietf.org>,
"draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org"
<draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org>
Cc: "straw@ietf.org" <straw@ietf.org>
Subject: Re: [straw] Review of draft-ietf-straw-b2bua-dtls-srtp

>Hi Paul,
>
>Thanks for your feedback. I will fix the broken link  to RFC7092 in
>section 1.2. Thanks for pointing that out.
>
>Regards,
>Ram
>
>-----Original Message-----
>From: Paul Wouters <paul@nohats.ca>
>Date: Friday, 20 November 2015 at 8:05 AM
>To: secdir <secdir@ietf.org>, "iesg@ietf.org" <iesg@ietf.org>,
>"draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org"
><draft-ietf-straw-b2bua-dtls-srtp.all@tools.ietf.org>
>Subject: Review of draft-ietf-straw-b2bua-dtls-srtp
>Resent-From: <paul@nohats.ca>
>Resent-To: <draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org>
>Resent-Date: Friday, 20 November 2015 at 8:05 AM
>
>>
>>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.
>>
>>As far as I understood the document and its dependancies (I'm not very
>>familiar with the sip/srtp world), the document is Ready.
>>
>>One minor nit: Section 1.2 has a broken link for RFC-7092.
>>
>>This document describes how a "middle man" relaying connections between
>>two sip endpoints should behave so it will not break the connection
>>between the sip endpoints. The security section clearly lists the
>>defenses the sip endpoints should take to ensure this "middle man" is
>>not maliciously decrypting/re-encrypting the content of the connection
>>it forwards between the endpoints.
>>
>>Paul
>
>_______________________________________________
>straw mailing list
>straw@ietf.org
>https://www.ietf.org/mailman/listinfo/straw


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--_004_D2751C6049C4Brmohanrciscocom_--


From nobody Sun Nov 22 06:41:13 2015
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Sip Traversal Required for Applications to Work Working Group of the IETF.

        Title           : DTLS-SRTP Handling in Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
        Authors         : Ram Mohan Ravindranath
                          Tirumaleswar Reddy
                          Gonzalo Salgueiro
                          Victor Pascual
                          Parthasarathi Ravindran
	Filename        : draft-ietf-straw-b2bua-dtls-srtp-09.txt
	Pages           : 12
	Date            : 2015-11-22

Abstract:
   Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
   often act on the media plane rather than just on the signaling path.
   This document describes the behaviour of such B2BUAs when acting on
   the media plane that uses an Secure Real-time Transport (SRTP)
   security context set up with the Datagram Transport Layer Security
   (DTLS) protocol.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-straw-b2bua-dtls-srtp/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-straw-b2bua-dtls-srtp-09

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-straw-b2bua-dtls-srtp-09


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Sun Nov 22 06:44:47 2015
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: "straw@ietf.org" <straw@ietf.org>
Thread-Topic: [straw] I-D Action: draft-ietf-straw-b2bua-dtls-srtp-09.txt
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FYI

This revision addresses comments from Ben, OPSDIR, APPSDIR, Gen-ART and
Security directorate reviews.

Regards,
Ram

-----Original Message-----
From: straw <straw-bounces@ietf.org> on behalf of
"internet-drafts@ietf.org" <internet-drafts@ietf.org>
Date: Sunday, 22 November 2015 at 8:11 PM
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Cc: "straw@ietf.org" <straw@ietf.org>
Subject: [straw] I-D Action: draft-ietf-straw-b2bua-dtls-srtp-09.txt

>
>A New Internet-Draft is available from the on-line Internet-Drafts
>directories.
> This draft is a work item of the Sip Traversal Required for Applications
>to Work Working Group of the IETF.
>
>        Title           : DTLS-SRTP Handling in Session Initiation
>Protocol (SIP) Back-to-Back User Agents (B2BUAs)
>        Authors         : Ram Mohan Ravindranath
>                          Tirumaleswar Reddy
>                          Gonzalo Salgueiro
>                          Victor Pascual
>                          Parthasarathi Ravindran
>	Filename        : draft-ietf-straw-b2bua-dtls-srtp-09.txt
>	Pages           : 12
>	Date            : 2015-11-22
>
>Abstract:
>   Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
>   often act on the media plane rather than just on the signaling path.
>   This document describes the behaviour of such B2BUAs when acting on
>   the media plane that uses an Secure Real-time Transport (SRTP)
>   security context set up with the Datagram Transport Layer Security
>   (DTLS) protocol.
>
>
>The IETF datatracker status page for this draft is:
>https://datatracker.ietf.org/doc/draft-ietf-straw-b2bua-dtls-srtp/
>
>There's also a htmlized version available at:
>https://tools.ietf.org/html/draft-ietf-straw-b2bua-dtls-srtp-09
>
>A diff from the previous version is available at:
>https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-straw-b2bua-dtls-srtp-09
>
>
>Please note that it may take a couple of minutes from the time of
>submission
>until the htmlized version and diff are available at tools.ietf.org.
>
>Internet-Drafts are also available by anonymous FTP at:
>ftp://ftp.ietf.org/internet-drafts/
>
>_______________________________________________
>straw mailing list
>straw@ietf.org
>https://www.ietf.org/mailman/listinfo/straw


From nobody Mon Nov 30 21:31:32 2015
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Subject: Re: [straw] Alissa Cooper's Discuss on draft-ietf-straw-b2bua-dtls-srtp-09: (with DISCUSS and COMMENT)
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A couple of quick comments on your discuss item 3 below. (I will leave 
it to the authors to respond to the rest)

On 30 Nov 2015, at 22:58, Alissa Cooper wrote:

> Alissa Cooper has entered the following ballot position for
> draft-ietf-straw-b2bua-dtls-srtp-09: Discuss
>
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut 
> this
> introductory paragraph, however.)
>
>
> Please refer to 
> https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
>
>
> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-straw-b2bua-dtls-srtp/
>
>
>
> ----------------------------------------------------------------------
> DISCUSS:
> ----------------------------------------------------------------------
>
> (1)
> I have a fairly fundamental concern about this document that I'd like 
> to
> discuss. My impression is that most B2BUAs in the market today that
> handle DTLS-SRTP do so with the explicit purpose of accessing the 
> media.
> That is, if I need a box that doesn't access the media I use a SIP 
> proxy,
> and if I need one that does access it I use a B2BUA. I realize that 
> there
> are more flavors of B2BUA defined in RFC 7092, but in terms of how 
> real
> SBCs work, it seems to me that they break DTLS-SRTP intentionally if 
> they
> do so at all.
>
> If that's the case, the question then arises about the value of 
> writing
> down normative recommendations that are more than likely to be 
> ignored.
> Perhaps this document would have made more sense as informational,
> offering a non-normative explanation of what a B2BUA should do if it 
> does
> not want to break e2e security. Even as an informational document it's
> still not obvious to me that there is much at all to say here for
> media-aware B2BUAs that isn't entirely reductive -- "don't terminate
> DTLS-SRTP if you don't want to break DTLS-SRTP" -- but at least as an
> informational document it wouldn't be suggesting normative 
> requirements
> that are out of sync with real deployments.
>
> Could you articulate the reasons why someone would build a B2BUA that
> follows the recommendations in this draft? I note that the draft says
> nothing about using a TURN server as a media relay, which seems like 
> it
> would be more common than using a B2BUA for the same purpose. Aren't
> B2BUAs typically deployed *because* they are media-aware?
>
> (2)
> Taking into account the above comment, I think 3.1.2.1 and 3.1.2.2 are
> problematic. 3.1.2.1 creates a normative SHOULD NOT-level requirement 
> for
> inspection B2BUAs without explaining what the exception cases are, and
> 3.1.2.2 creates no normative requirements for modification B2BUAs. 
> It's
> not even clear to me why the distinction is being drawn between the 
> two
> kinds of B2BUAs if the bottom line is that in both cases the
> recommendation is to not terminate DTLS-SRTP. But this brings us back 
> to
> the above comment. The problem here seems to be that what the WG and 
> the
> IETF would want to say here is that B2BUAs MUST NOT terminate 
> DTLS-SRTP
> to man-in-the-middle the media, but that is what B2BUAs generally do, 
> so
> instead the text waffles and the recommendations are watered down and
> unclear.
>
> (3)
> The characterization of the RFC 4474 mechanism seems to contradict the
> way the mechanism is actually specified. The 4474 mechanism was 
> designed
> such that intermediaries would be able to provide signatures on behalf 
> of
> users (e.g., see RFC 4474 Section 3, "This specification allows either 
> a
> user agent or a proxy server to provide identity services and to 
> verify
> identities ... in the initial use of this mechanism, it is likely that
> intermediaries will instantiate the authentication service role"). So 
> the
> claim that terminating DTLS-SRTP would cause 4474 identity and 
> integrity
> checks to fail isn't true, because an SBC can decrypt and re-sign the
> request itself. A B2BUA that bridges two administrative domains can 
> check
> the validity of the signature in the domain on on side as 
> authorization
> to form a new signature that is valid in the domain in the other side.
>
> The fact that user-provided identity assertions are not guaranteed to
> persist end-to-end is one key reason for the ongoing work in the STIR 
> WG.
> The work there and elsewhere shows that it's fairly widely 
> acknowledged
> that 4474 has not seen the deployment that was hoped for when it was
> specified. Making its use a normative requirement here again seems out 
> of
> sync with deployment reality. I would encourage you to review
> draft-ietf-stir-rfc4474bis and reconsider what security mechanism 
> should
> form the basis of the recommendations in this draft.

There was discussion that a b2bua could terminate dtls-srtp if it 
provided an identity service, or acted in collusion with an identity 
service.  My understanding is that the authors felt that delving into 
special cases where it might be "okay" for a b2bua to terminate 
dtls-srtp would add too much complexity to the point. (There's also the 
fact that dtls-srtp says you SHOULD use 4474, not MUST).

I tend to agree on the complexity--but I think it would make sense to 
clarify this to say that a b2bua that is not also providing an identity 
service is likely to break things.

As far as 4474bis is concerned--they originally referenced 4474bis, and 
I suggested that they not do so. My reasoning was that both 4474 and 
4474bis (as written at that time) protected the fingerprint, which was 
the important bit here--and that since 4474bis was expected to obsolete 
4474, a reference to 4474 would "self upgrade", so to speak. Do you 
disagree with that? (But to be totally honest, my concern was entirely 
about avoiding an extended stay in MISSREF land. Maybe that's not as big 
of a concern now?)


>
>
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>
> Section 3.1.1:
>
> Is there anything new being specified here that isn't already 
> specified
> in other SIP documents?
>
> Section 3.2:
>
> Is this saying anything that RFC 5763 doesn't already say?

