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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Joel Halpern <jmh@joelhalpern.com>, "gen-art@ietf.org" <gen-art@ietf.org>
Thread-Topic: Review of draft-ietf-bfcpbis-sdp-ws-uri-07
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Date: Tue, 3 Jan 2017 08:36:19 +0000
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Subject: Re: [bfcpbis] Review of draft-ietf-bfcpbis-sdp-ws-uri-07
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From nobody Tue Jan  3 06:17:51 2017
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To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>, "gen-art@ietf.org" <gen-art@ietf.org>
References: <148253493203.16856.4857620752315294427.idtracker@ietfa.amsl.com> <571231A9-2757-4B86-BC65-2491B6B7F882@cisco.com>
From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Date: Tue, 3 Jan 2017 09:17:38 -0500
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Subject: Re: [bfcpbis] Review of draft-ietf-bfcpbis-sdp-ws-uri-07
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Yes, those fixes ddress my concerns.  Thank you.
Joel

On 1/3/17 3:36 AM, Ram Mohan R (rmohanr) wrote:
> Hi Joel,
>
> Thanks for your response. Please see inline
>
> -----Original Message-----
> From: Joel Halpern <jmh@joelhalpern.com>
> Date: Saturday, 24 December 2016 at 4:45 AM
> To: "gen-art@ietf.org" <gen-art@ietf.org>
> Cc: "bfcpbis@ietf.org" <bfcpbis@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "draft-ietf-bfcpbis-sdp-ws-uri.all@ietf.org" <draft-ietf-bfcpbis-sdp-ws-uri.all@ietf.org>
> Subject: Review of draft-ietf-bfcpbis-sdp-ws-uri-07
> Resent-From: <alias-bounces@ietf.org>
> Resent-To: <rmohanr@cisco.com>, <gsalguei@cisco.com>, <keith.drage@alcatel-lucent.com>, <eckelcu@cisco.com>, <ben@nostrum.com>, <alissa@cooperw.in>, <aamelnikov@fastmail.fm>, Charles Eckel <eckelcu@cisco.com>
> Resent-Date: Saturday, 24 December 2016 at 4:45 AM
>
>     Reviewer: Joel Halpern
>     Review result: Ready with Nits
>
>     I am the assigned Gen-ART reviewer for this draft. The General Area
>     Review Team (Gen-ART) reviews all IETF documents being processed
>     by the IESG for the IETF Chair.  Please treat these comments just
>     like any other last call comments.
>
>     For more information, please see the FAQ at
>
>     <https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.
>
>     Document: draft-ietf-bfcpbis-sdp-ws-uri-??
>     Reviewer: Joel Halpern
>     Review Date: 2016-12-23
>     IETF LC End Date: 2017-01-12
>     IESG Telechat date: 2017-01-19
>
>     Summary: This document is ready for publication as a Proposed Standard
>     RFC.  I have a few minor comments that should be considered s they may
>     improve future understanding of the document.
>
>     Major issues: None
>
>     Minor issues:
>         In reading section 4.2 and 4.3, I believe I can guess at certain
>     intended behaviors, but it is not as clearly stated as I think is
>     desirable.  There is also one odd statement in section 4.3
>
>         Taking the odd statement first, the text in section 4.3 refers the
>     active answerer "towards
>        the IP address and port of the offerer".  But when WebSockets is
>     used, one does not connect to the IP address and port, but to the URI
>     specified.
>
> <Ram> I will replace the text as below:
>
> EXISTING:
> Towards the IP address and port of the offerer using the procedures described
>    in [RFC6455]
>
> NEW:
> Towards the URI specified in a=ws-uri or a=wss-uri attribute using procedures described
>    in [RFC6455]
>
>         I believe that the intent in 4.2 and 4.3 is that whichever side
>     will be "passive" is required to provide an a=ws-uri or a=wss-uri so
>     that the other side can establish the connection to the URI.  But
>     section 4.2 does not say that.
>
> <Ram>
> EXISTING:
>    The offerer SHOULD assign the SDP "setup" attribute with a value of
>    "active" (the offerer will be the initiator of the outgoing TCP
>    connection), unless the offerer insists on being a receiver of an
>    incoming connection, in which case the offerer SHOULD use a value of
>    "passive".  The offerer MUST NOT assign an SDP "setup" attribute with
>    a "holdconn" value.
>
> NEW:
>    The offerer SHOULD assign the SDP "setup" attribute with a value of
>    "active" (the offerer will be the initiator of the outgoing TCP
>    connection), unless the offerer insists on being a receiver of an
>    incoming connection, in which case the offerer SHOULD use a value of
>    "passive".  The offerer MUST NOT assign an SDP "setup" attribute with
>    a "holdconn" value. If the “setup” attribute has a value “passive” it MUST also
> have URI in the a=ws-uri or a=wss-uri attribute.
>
>  And the text in section4.3 that talks
>     about providing the URI in the a= does not qualify whether it is
>     required with active, passive, or both.
>
> <Ram>
> NEW:
> If the answers assigns SDP “setup” attribute with “passive”, then it MUST have URI in either
> a=ws-uri or a=wss-uri attribute.
>
> Does this look good and makes it more clear ?
>
> Regards,
> Ram
>
>     Nits/editorial comments:  N/A
>
>
>
>


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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: Roman Shpount <roman@telurix.com>
Thread-Topic: [MMUSIC] [bfcpbis]  m= line protocol in case of ICE
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Date: Tue, 3 Jan 2017 19:43:55 +0000
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References: <CAD5OKxuhvCz82+7JK8QrArtrYcjV9+b7vWMpWRnCjNbrL++srA@mail.gmail.com> <7594FB04B1934943A5C02806D1A2204B4BE3AE83@ESESSMB209.ericsson.se> <CAD5OKxu15YgYO0xyWMYXv7VTAVVQ71iJhH_txt31BV0CvCSjqg@mail.gmail.com> <F96AC385-2721-4652-98F5-1BF92F06214A@gmail.com> <D0210B5A-138A-4C86-8D14-6E1FEC011E33@cisco.com> <CAD5OKxuzpVRsR0cMeUyhe35sA9W6bL=p1=0RUpTqwpQDyinwDA@mail.gmail.com> <16B5D8FF-F132-4B09-84D6-AE964CA7858D@cisco.com> <CAD5OKxsAHCykObDwZ2_n+XH7brkCz9yLbZFr9-MCQwzkn4uUmg@mail.gmail.com> <64E8A5CF-89ED-4673-AF23-2C960395C3EF@cisco.com>
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Subject: Re: [bfcpbis] [MMUSIC]   m= line protocol in case of ICE
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From: Roman Shpount <roman@telurix.com>
Date: Tue, 3 Jan 2017 15:08:04 -0500
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To: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
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Subject: Re: [bfcpbis] [MMUSIC]  m= line protocol in case of ICE
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Charles,

I do not think not supporting ICE tcp candidates will quite work since it
will reduce the usability considerably. The simplest way to move forward is
to define a different transport tag for BFCP  with RFC 4571 over TCP not to
confuse it with TCP/BFCP. It can be TCP/UDP/BFCP (I know this looks strange
and I am open to other suggestions, such as calling all packet based
protocols DBFCP).

In general what I am proposing is:

TCP/BFCP -- existing BFCP over TCP
TLS/BFCP -- exisitng BFCP over TLS
UDP/BFCP -- BFCP over UDP or ICE udp candidates
TCP/UDP/BFCP -- BFCP with RFC 4571 framing over TCP or over ICE tcp
candidates
UDP/DTLS/BFCP -- BFCP over DTLS or over ICE udp candidates
TCP/DTLS/BFCP -- BFCP over DTLS with RFC 4571 framing over TCP or over ICE
tcp candidates

Legacy BFCP over TCP or TLS cannot work with ICE or NAT. Other protocols
can work with NAT or ICE using normal ICE procedures.

If we call all packet based protocols DBFCP then transport tags will be:

TCP/BFCP -- existing BFCP over TCP
TLS/BFCP -- exisitng BFCP over TLS
UDP/DBFCP -- DBFCP over UDP or ICE udp candidates
TCP/DBFCP -- DBFCP with RFC 4571 framing over TCP or over ICE tcp candidate=
s
UDP/DTLS/DBFCP -- DBFCP over DTLS or over ICE udp candidates
TCP/DTLS/DBFCP -- DBFCP over DTLS with RFC 4571 framing over TCP or over
ICE tcp candidates

Since BFCP over UDP (or other packet based protocols) is quite different
due to timers and transmission restrictions, it can have a different
transport tag and even be defined in a separate RFC.

Regards,

_____________
Roman Shpount

On Tue, Jan 3, 2017 at 2:43 PM, Charles Eckel (eckelcu) <eckelcu@cisco.com>
wrote:

> Crickets=E2=80=A6
>
> If no one is or has plans for using ICE with TCP/BFCP, perhaps it is best
> to state that as of this rev of the BFCP spec, BFCP with TCP candidates i=
s
> not defined. Future updates to the spec may define this usage.
>
>
>
> Cheers,
>
> Charles
>
>
>
> *From: *mmusic <mmusic-bounces@ietf.org> on behalf of Charles Eckel <
> eckelcu@cisco.com>
> *Date: *Friday, December 2, 2016 at 4:01 PM
> *To: *Roman Shpount <roman@telurix.com>
> *Cc: *"ice@ietf.org" <ice@ietf.org>, "bfcpbis@ietf.org" <bfcpbis@ietf.org=
>,
> Christer Holmberg <christer.holmberg@ericsson.com>, "mmusic@ietf.org" <
> mmusic@ietf.org>
> *Subject: *Re: [MMUSIC] [bfcpbis] m=3D line protocol in case of ICE
>
>
>
> I have no experience with ICE with TCP candidates so hopefully others can
> chime in as to what they think is a workable solution.
>
>
>
> Cheers,
>
> Charles
>
>
>
> *From: *Roman Shpount <roman@telurix.com>
> *Date: *Thursday, December 1, 2016 at 12:34 PM
> *To: *Charles Eckel <eckelcu@cisco.com>
> *Cc: *Alan Ford <alan.ford@gmail.com>, "bfcpbis@ietf.org" <
> bfcpbis@ietf.org>, "ice@ietf.org" <ice@ietf.org>, "mmusic@ietf.org" <
> mmusic@ietf.org>, Christer Holmberg <christer.holmberg@ericsson.com>
> *Subject: *Re: [bfcpbis] [MMUSIC] m=3D line protocol in case of ICE
>
>
>
> Charles,
>
>
>
> RFC 6544 Sending Media (https://tools.ietf.org/html/rfc6544#section-10.1)=
 says
> that "The framing defined in RFC 4571
> <https://tools.ietf.org/html/rfc4571> MUST be used when sending media."
> This means the protocol used is not TCP/BFCP which is using application
> level framing. I believe that STUN/Media demultiplexing requirements woul=
d
> prevent using TCP/BFCP directly with ice tcp candidates without redesign =
of
> either ICE TCP or TCP/BFCP.
>
>
>
> Furthermore there are other implied ICE requirements that I outlined
> before (switching between udp and tpc candidates, existence of SBC which
> terminate ICE only but do not support the embedded protocol) because of
> which ice tcp is considered unreliable transport and will require
> fragmentation support and re-transmit timers that are not part of TCP/BFC=
P.
>
>
>
> Regards,
>
>
> _____________
> Roman Shpount
>
>
>
> On Thu, Dec 1, 2016 at 3:17 PM, Charles Eckel (eckelcu) <eckelcu@cisco.co=
m>
> wrote:
>
> Roman,
>
>
>
> Why would selecting TCP/BFCP as transport violate RFC 6544? Perhaps it
> does, but after a quick scan I am not sure why.
>
>
>
> Cheers,
>
> Charles
>
>
>
> *From: *Roman Shpount <roman@telurix.com>
> *Date: *Tuesday, November 29, 2016 at 10:38 AM
> *To: *Charles Eckel <eckelcu@cisco.com>
> *Cc: *Alan Ford <alan.ford@gmail.com>, "bfcpbis@ietf.org" <
> bfcpbis@ietf.org>, "ice@ietf.org" <ice@ietf.org>, "mmusic@ietf.org" <
> mmusic@ietf.org>, Christer Holmberg <christer.holmberg@ericsson.com>
> *Subject: *Re: [bfcpbis] [MMUSIC] m=3D line protocol in case of ICE
>
>
>
> On Tue, Nov 29, 2016 at 12:48 PM, Charles Eckel (eckelcu) <
> eckelcu@cisco.com> wrote:
>
> It seems to me that the most straightforward approach would be to mandate
> support for BFCP over UDP when using ICE, use UDP as the default candidat=
e,
> and signal the BFCP m-line as if it is BFCP over UDP. If we can mandate t=
he
> use of DTLS, that would be even better.
>
> Thoughts?
>
>
>
>
>
> I agree.
>
>
>
> The only issue that I still have, if DTLS is not used, what protocol is
> used when ICE tcp candidate is selected for transport. Is this TCP/BFCP
> (which goes against RFC6544)  or is it UDP/BFCP with RFC4571 framing? If =
it
> is UDP/BFCP with RFC4571 framing, what transport tag should be used in th=
e
> re-INVITE which is sent after ICE nomination with only selected candidate=
?
> Should it be TCP/UDP/BFCP or something similar?
>
>
>
> Regards,
>
> _____________
> Roman Shpount
>
>
>
>
>
>

--001a1140396ce390540545363931
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Charles,<div><br></div><div>I do not think not supporting =
ICE tcp candidates will quite work since it will reduce the usability consi=
derably. The simplest way to move forward is to define a different transpor=
t tag for BFCP =C2=A0with RFC 4571 over TCP not to confuse it with TCP/BFCP=
. It can be TCP/UDP/BFCP (I know this looks strange and I am open to other =
suggestions, such as calling all packet based protocols DBFCP).=C2=A0</div>=
<div><br></div><div>In general what I am proposing is:</div><div><br></div>=
<div>TCP/BFCP -- existing BFCP over TCP</div><div>TLS/BFCP -- exisitng BFCP=
 over TLS</div><div>UDP/BFCP -- BFCP over UDP or ICE udp candidates</div><d=
iv>TCP/UDP/BFCP -- BFCP with RFC 4571 framing=C2=A0over TCP or over ICE tcp=
 candidates<br></div><div>UDP/DTLS/BFCP -- BFCP over DTLS or over ICE udp c=
andidates</div><div>TCP/DTLS/BFCP -- BFCP over DTLS with RFC 4571 framing=
=C2=A0over TCP or over ICE tcp candidates</div><div><br></div><div>Legacy B=
FCP over TCP or TLS cannot work with ICE or NAT. Other protocols can work w=
ith NAT or ICE using normal ICE procedures.</div><div><br></div><div>If we =
call all packet based protocols DBFCP then transport tags will be:</div><di=
v><br></div><div><div>TCP/BFCP -- existing BFCP over TCP</div><div>TLS/BFCP=
 -- exisitng BFCP over TLS</div><div>UDP/DBFCP -- DBFCP over UDP or ICE udp=
 candidates</div><div>TCP/DBFCP -- DBFCP with RFC 4571 framing=C2=A0over TC=
P or over ICE tcp candidates<br></div><div>UDP/DTLS/DBFCP -- DBFCP over DTL=
S or over ICE udp candidates</div><div>TCP/DTLS/DBFCP -- DBFCP over DTLS wi=
th RFC 4571 framing=C2=A0over TCP or over ICE tcp candidates</div><div><br>=
</div></div><div>Since BFCP over UDP (or other packet based protocols) is q=
uite different due to timers and transmission restrictions, it can have a d=
ifferent transport tag and even be defined in a separate RFC.</div><div><br=
></div><div>Regards,</div></div><div class=3D"gmail_extra"><br clear=3D"all=
"><div><div class=3D"gmail_signature" data-smartmail=3D"gmail_signature">__=
___________<br>Roman Shpount</div></div>
<br><div class=3D"gmail_quote">On Tue, Jan 3, 2017 at 2:43 PM, Charles Ecke=
l (eckelcu) <span dir=3D"ltr">&lt;<a href=3D"mailto:eckelcu@cisco.com" targ=
et=3D"_blank">eckelcu@cisco.com</a>&gt;</span> wrote:<br><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">







<div bgcolor=3D"white" lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_6178081229878505394WordSection1">
<p class=3D"MsoNormal">Crickets=E2=80=A6<u></u><u></u></p>
<p class=3D"MsoNormal">If no one is or has plans for using ICE with TCP/BFC=
P, perhaps it is best to state that as of this rev of the BFCP spec, BFCP w=
ith TCP candidates is not defined. Future updates to the spec may define th=
is usage.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Cheers,<u></u><u></u></p>
<p class=3D"MsoNormal">Charles<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<blockquote style=3D"border:none;border-left:solid #b5c4df 4.5pt;padding:0i=
n 0in 0in 4.0pt;margin-left:3.75pt;margin-right:0in">
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-family:Calibri;color:black">F=
rom: </span>
</b><span style=3D"font-family:Calibri;color:black">mmusic &lt;<a href=3D"m=
ailto:mmusic-bounces@ietf.org" target=3D"_blank">mmusic-bounces@ietf.org</a=
>&gt; on behalf of Charles Eckel &lt;<a href=3D"mailto:eckelcu@cisco.com" t=
arget=3D"_blank">eckelcu@cisco.com</a>&gt;<br>
<b>Date: </b>Friday, December 2, 2016 at 4:01 PM<br>
<b>To: </b>Roman Shpount &lt;<a href=3D"mailto:roman@telurix.com" target=3D=
"_blank">roman@telurix.com</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:ice@ietf.org" target=3D"_blank">ice@ietf=
.org</a>&quot; &lt;<a href=3D"mailto:ice@ietf.org" target=3D"_blank">ice@ie=
tf.org</a>&gt;, &quot;<a href=3D"mailto:bfcpbis@ietf.org" target=3D"_blank"=
>bfcpbis@ietf.org</a>&quot; &lt;<a href=3D"mailto:bfcpbis@ietf.org" target=
=3D"_blank">bfcpbis@ietf.org</a>&gt;, Christer Holmberg &lt;<a href=3D"mail=
to:christer.holmberg@ericsson.com" target=3D"_blank">christer.holmberg@eric=
sson.<wbr>com</a>&gt;, &quot;<a href=3D"mailto:mmusic@ietf.org" target=3D"_=
blank">mmusic@ietf.org</a>&quot; &lt;<a href=3D"mailto:mmusic@ietf.org" tar=
get=3D"_blank">mmusic@ietf.org</a>&gt;<br>
<b>Subject: </b>Re: [MMUSIC] [bfcpbis] m=3D line protocol in case of ICE<u>=
</u><u></u></span></p>
</div><div><div class=3D"h5">
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal">I have no experience with ICE with TCP candidates so=
 hopefully others can chime in as to what they think is a workable solution=
.
<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">Cheers,<u></u><u></u></p>
<p class=3D"MsoNormal">Charles<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #b5c4df 4.5pt;padding:0i=
n 0in 0in 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin=
-bottom:5.0pt">
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-family:Calibri;color:black">F=
rom: </span>
</b><span style=3D"font-family:Calibri;color:black">Roman Shpount &lt;<a hr=
ef=3D"mailto:roman@telurix.com" target=3D"_blank">roman@telurix.com</a>&gt;=
<br>
<b>Date: </b>Thursday, December 1, 2016 at 12:34 PM<br>
<b>To: </b>Charles Eckel &lt;<a href=3D"mailto:eckelcu@cisco.com" target=3D=
"_blank">eckelcu@cisco.com</a>&gt;<br>
<b>Cc: </b>Alan Ford &lt;<a href=3D"mailto:alan.ford@gmail.com" target=3D"_=
blank">alan.ford@gmail.com</a>&gt;, &quot;<a href=3D"mailto:bfcpbis@ietf.or=
g" target=3D"_blank">bfcpbis@ietf.org</a>&quot; &lt;<a href=3D"mailto:bfcpb=
is@ietf.org" target=3D"_blank">bfcpbis@ietf.org</a>&gt;, &quot;<a href=3D"m=
ailto:ice@ietf.org" target=3D"_blank">ice@ietf.org</a>&quot; &lt;<a href=3D=
"mailto:ice@ietf.org" target=3D"_blank">ice@ietf.org</a>&gt;, &quot;<a href=
=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic@ietf.org</a>&quot; &lt=
;<a href=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic@ietf.org</a>&g=
t;, Christer Holmberg &lt;<a href=3D"mailto:christer.holmberg@ericsson.com"=
 target=3D"_blank">christer.holmberg@ericsson.<wbr>com</a>&gt;<br>
<b>Subject: </b>Re: [bfcpbis] [MMUSIC] m=3D line protocol in case of ICE</s=
pan><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Charles, <u></u><u></u></p>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">RFC 6544 Sending Media (<a href=3D"https://tools.iet=
f.org/html/rfc6544#section-10.1" target=3D"_blank">https://tools.ietf.org/h=
tml/<wbr>rfc6544#section-10.1</a>)=C2=A0says that &quot;<span style=3D"font=
-size:10.0pt;color:black">The framing defined in
</span><a href=3D"https://tools.ietf.org/html/rfc4571" target=3D"_blank"><s=
pan style=3D"font-size:10.0pt">RFC 4571</span></a><span style=3D"font-size:=
10.0pt;color:black"> MUST be used when sending media.&quot; This means the =
protocol used is not TCP/BFCP which is using application level
 framing. I believe that STUN/Media demultiplexing requirements would preve=
nt using TCP/BFCP directly with ice tcp candidates without redesign of eith=
er ICE TCP or TCP/BFCP.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:black">Further=
more=C2=A0there are other implied ICE requirements that I outlined before (=
switching between udp and tpc candidates, existence of SBC which terminate =
ICE only but do not support the embedded
 protocol) because of which ice tcp is considered unreliable transport and =
will require fragmentation support and re-transmit timers that are not part=
 of TCP/BFCP.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:black">Regards=
,</span><u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><br clear=3D"all">
<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal">_____________<br>
Roman Shpount<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">On Thu, Dec 1, 2016 at 3:17 PM, Charles Eckel (eckel=
cu) &lt;<a href=3D"mailto:eckelcu@cisco.com" target=3D"_blank">eckelcu@cisc=
o.com</a>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal">Roman,<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">Why would selecting TCP/BFCP as transport violate RF=
C 6544? Perhaps it does, but after a quick scan I am not sure why.<u></u><u=
></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">Cheers,<u></u><u></u></p>
<p class=3D"MsoNormal">Charles<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #b5c4df 4.5pt;padding:0i=
n 0in 0in 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin=
-bottom:5.0pt">
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-family:Calibri;color:black">F=
rom:
</span></b><span style=3D"font-family:Calibri;color:black">Roman Shpount &l=
t;<a href=3D"mailto:roman@telurix.com" target=3D"_blank">roman@telurix.com<=
/a>&gt;<br>
<b>Date: </b>Tuesday, November 29, 2016 at 10:38 AM<br>
<b>To: </b>Charles Eckel &lt;<a href=3D"mailto:eckelcu@cisco.com" target=3D=
"_blank">eckelcu@cisco.com</a>&gt;<br>
<b>Cc: </b>Alan Ford &lt;<a href=3D"mailto:alan.ford@gmail.com" target=3D"_=
blank">alan.ford@gmail.com</a>&gt;, &quot;<a href=3D"mailto:bfcpbis@ietf.or=
g" target=3D"_blank">bfcpbis@ietf.org</a>&quot; &lt;<a href=3D"mailto:bfcpb=
is@ietf.org" target=3D"_blank">bfcpbis@ietf.org</a>&gt;, &quot;<a href=3D"m=
ailto:ice@ietf.org" target=3D"_blank">ice@ietf.org</a>&quot;
 &lt;<a href=3D"mailto:ice@ietf.org" target=3D"_blank">ice@ietf.org</a>&gt;=
, &quot;<a href=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic@ietf.or=
g</a>&quot; &lt;<a href=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic=
@ietf.org</a>&gt;, Christer Holmberg &lt;<a href=3D"mailto:christer.holmber=
g@ericsson.com" target=3D"_blank">christer.holmberg@ericsson.<wbr>com</a>&g=
t;<br>
<b>Subject: </b>Re: [bfcpbis] [MMUSIC] m=3D line protocol in case of ICE</s=
pan><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal">On Tue, Nov 29, 2016 at 12:48 PM, Charles Eckel (eck=
elcu) &lt;<a href=3D"mailto:eckelcu@cisco.com" target=3D"_blank">eckelcu@ci=
sco.com</a>&gt; wrote:<u></u><u></u></p>
</div>
</div>
<div>
<div>
<div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal">It seems to me that the most straightforward approac=
h would be to mandate support for BFCP over UDP when using ICE, use UDP as =
the default candidate, and signal the BFCP m-line
 as if it is BFCP over UDP. If we can mandate the use of DTLS, that would b=
e even better.<u></u><u></u></p>
<p class=3D"MsoNormal">Thoughts?<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I agree.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">The only issue that I still have, if DTLS is not use=
d, what protocol is used when ICE tcp candidate is=C2=A0selected for transp=
ort. Is this TCP/BFCP (which goes against RFC6544) =C2=A0or
 is it UDP/BFCP with RFC4571 framing? If it is UDP/BFCP with RFC4571 framin=
g, what transport tag should be used in the re-INVITE which is sent after I=
CE nomination with only selected candidate? Should it be TCP/UDP/BFCP or so=
mething similar?<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">_____________<br>
Roman Shpount<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</blockquote>
</div></div></blockquote>
</div>
</div>

</blockquote></div><br></div>

--001a1140396ce390540545363931--


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From: Alan Ford <alan.ford@gmail.com>
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Date: Tue, 3 Jan 2017 23:23:35 +0000
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To: Roman Shpount <roman@telurix.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bfcpbis/Uhd46R59ee3OoDyK9C3ekc0Cj18>
Cc: "ice@ietf.org" <ice@ietf.org>, "mmusic@ietf.org" <mmusic@ietf.org>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>, "Charles Eckel \(eckelcu\)" <eckelcu@cisco.com>, Christer Holmberg <christer.holmberg@ericsson.com>
Subject: Re: [bfcpbis] [MMUSIC]  m= line protocol in case of ICE
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Roman,

Do any of those work for having both tcp and udp ICE candidates? I =
assume any with ICE (+ 4571 framing) would be acceptable for that case?

Ideally we need to support the case where an answer=E2=80=99s m-line =
protocol does not match any of the candidates, so that an answer could =
only support TCP (say) when the offerer supported both (and used a UDP =
m-line protocol). If Christer=E2=80=99s proposed change which permitted =
an answer not to match the m-line protocol in the ICE candidates was =
accepted, that would resolve this case. Do you see any problems here?

Regards,
Alan

> On 3 Jan 2017, at 20:08, Roman Shpount <roman@telurix.com> wrote:
>=20
> Charles,
>=20
> I do not think not supporting ICE tcp candidates will quite work since =
it will reduce the usability considerably. The simplest way to move =
forward is to define a different transport tag for BFCP  with RFC 4571 =
over TCP not to confuse it with TCP/BFCP. It can be TCP/UDP/BFCP (I know =
this looks strange and I am open to other suggestions, such as calling =
all packet based protocols DBFCP).=20
>=20
> In general what I am proposing is:
>=20
> TCP/BFCP -- existing BFCP over TCP
> TLS/BFCP -- exisitng BFCP over TLS
> UDP/BFCP -- BFCP over UDP or ICE udp candidates
> TCP/UDP/BFCP -- BFCP with RFC 4571 framing over TCP or over ICE tcp =
candidates
> UDP/DTLS/BFCP -- BFCP over DTLS or over ICE udp candidates
> TCP/DTLS/BFCP -- BFCP over DTLS with RFC 4571 framing over TCP or over =
ICE tcp candidates
>=20
> Legacy BFCP over TCP or TLS cannot work with ICE or NAT. Other =
protocols can work with NAT or ICE using normal ICE procedures.
>=20
> If we call all packet based protocols DBFCP then transport tags will =
be:
>=20
> TCP/BFCP -- existing BFCP over TCP
> TLS/BFCP -- exisitng BFCP over TLS
> UDP/DBFCP -- DBFCP over UDP or ICE udp candidates
> TCP/DBFCP -- DBFCP with RFC 4571 framing over TCP or over ICE tcp =
candidates
> UDP/DTLS/DBFCP -- DBFCP over DTLS or over ICE udp candidates
> TCP/DTLS/DBFCP -- DBFCP over DTLS with RFC 4571 framing over TCP or =
over ICE tcp candidates
>=20
> Since BFCP over UDP (or other packet based protocols) is quite =
different due to timers and transmission restrictions, it can have a =
different transport tag and even be defined in a separate RFC.
>=20
> Regards,
>=20
> _____________
> Roman Shpount
>=20
> On Tue, Jan 3, 2017 at 2:43 PM, Charles Eckel (eckelcu) =
<eckelcu@cisco.com <mailto:eckelcu@cisco.com>> wrote:
> Crickets=E2=80=A6
>=20
> If no one is or has plans for using ICE with TCP/BFCP, perhaps it is =
best to state that as of this rev of the BFCP spec, BFCP with TCP =
candidates is not defined. Future updates to the spec may define this =
usage.
>=20
> =20
>=20
> Cheers,
>=20
> Charles
>=20
> =20
>=20
> From: mmusic <mmusic-bounces@ietf.org =
<mailto:mmusic-bounces@ietf.org>> on behalf of Charles Eckel =
<eckelcu@cisco.com <mailto:eckelcu@cisco.com>>
> Date: Friday, December 2, 2016 at 4:01 PM
> To: Roman Shpount <roman@telurix.com <mailto:roman@telurix.com>>
> Cc: "ice@ietf.org <mailto:ice@ietf.org>" <ice@ietf.org =
<mailto:ice@ietf.org>>, "bfcpbis@ietf.org <mailto:bfcpbis@ietf.org>" =
<bfcpbis@ietf.org <mailto:bfcpbis@ietf.org>>, Christer Holmberg =
<christer.holmberg@ericsson.com =
<mailto:christer.holmberg@ericsson.com>>, "mmusic@ietf.org =
<mailto:mmusic@ietf.org>" <mmusic@ietf.org <mailto:mmusic@ietf.org>>
> Subject: Re: [MMUSIC] [bfcpbis] m=3D line protocol in case of ICE
>=20
> =20
>=20
> I have no experience with ICE with TCP candidates so hopefully others =
can chime in as to what they think is a workable solution.
>=20
> =20
>=20
> Cheers,
>=20
> Charles
>=20
> =20
>=20
> From: Roman Shpount <roman@telurix.com <mailto:roman@telurix.com>>
> Date: Thursday, December 1, 2016 at 12:34 PM
> To: Charles Eckel <eckelcu@cisco.com <mailto:eckelcu@cisco.com>>
> Cc: Alan Ford <alan.ford@gmail.com <mailto:alan.ford@gmail.com>>, =
"bfcpbis@ietf.org <mailto:bfcpbis@ietf.org>" <bfcpbis@ietf.org =
<mailto:bfcpbis@ietf.org>>, "ice@ietf.org <mailto:ice@ietf.org>" =
<ice@ietf.org <mailto:ice@ietf.org>>, "mmusic@ietf.org =
<mailto:mmusic@ietf.org>" <mmusic@ietf.org <mailto:mmusic@ietf.org>>, =
Christer Holmberg <christer.holmberg@ericsson.com =
<mailto:christer.holmberg@ericsson.com>>
> Subject: Re: [bfcpbis] [MMUSIC] m=3D line protocol in case of ICE
>=20
> =20
>=20
> Charles,
>=20
> =20
>=20
> RFC 6544 Sending Media =
(https://tools.ietf.org/html/rfc6544#section-10.1 =
<https://tools.ietf.org/html/rfc6544#section-10.1>) says that "The =
framing defined in RFC 4571 <https://tools.ietf.org/html/rfc4571> MUST =
be used when sending media." This means the protocol used is not =
TCP/BFCP which is using application level framing. I believe that =
STUN/Media demultiplexing requirements would prevent using TCP/BFCP =
directly with ice tcp candidates without redesign of either ICE TCP or =
TCP/BFCP.
>=20
> =20
>=20
> Furthermore there are other implied ICE requirements that I outlined =
before (switching between udp and tpc candidates, existence of SBC which =
terminate ICE only but do not support the embedded protocol) because of =
which ice tcp is considered unreliable transport and will require =
fragmentation support and re-transmit timers that are not part of =
TCP/BFCP.
>=20
> =20
>=20
> Regards,
>=20
>=20
>=20
> _____________
> Roman Shpount
>=20
> =20
>=20
> On Thu, Dec 1, 2016 at 3:17 PM, Charles Eckel (eckelcu) =
<eckelcu@cisco.com <mailto:eckelcu@cisco.com>> wrote:
>=20
> Roman,
>=20
> =20
>=20
> Why would selecting TCP/BFCP as transport violate RFC 6544? Perhaps it =
does, but after a quick scan I am not sure why.
>=20
> =20
>=20
> Cheers,
>=20
> Charles
>=20
> =20
>=20
> From: Roman Shpount <roman@telurix.com <mailto:roman@telurix.com>>
> Date: Tuesday, November 29, 2016 at 10:38 AM
> To: Charles Eckel <eckelcu@cisco.com <mailto:eckelcu@cisco.com>>
> Cc: Alan Ford <alan.ford@gmail.com <mailto:alan.ford@gmail.com>>, =
"bfcpbis@ietf.org <mailto:bfcpbis@ietf.org>" <bfcpbis@ietf.org =
<mailto:bfcpbis@ietf.org>>, "ice@ietf.org <mailto:ice@ietf.org>" =
<ice@ietf.org <mailto:ice@ietf.org>>, "mmusic@ietf.org =
<mailto:mmusic@ietf.org>" <mmusic@ietf.org <mailto:mmusic@ietf.org>>, =
Christer Holmberg <christer.holmberg@ericsson.com =
<mailto:christer.holmberg@ericsson.com>>
> Subject: Re: [bfcpbis] [MMUSIC] m=3D line protocol in case of ICE
>=20
> =20
>=20
> On Tue, Nov 29, 2016 at 12:48 PM, Charles Eckel (eckelcu) =
<eckelcu@cisco.com <mailto:eckelcu@cisco.com>> wrote:
>=20
> It seems to me that the most straightforward approach would be to =
mandate support for BFCP over UDP when using ICE, use UDP as the default =
candidate, and signal the BFCP m-line as if it is BFCP over UDP. If we =
can mandate the use of DTLS, that would be even better.
>=20
> Thoughts?
>=20
> =20
>=20
> =20
>=20
> I agree.
>=20
> =20
>=20
> The only issue that I still have, if DTLS is not used, what protocol =
is used when ICE tcp candidate is selected for transport. Is this =
TCP/BFCP (which goes against RFC6544)  or is it UDP/BFCP with RFC4571 =
framing? If it is UDP/BFCP with RFC4571 framing, what transport tag =
should be used in the re-INVITE which is sent after ICE nomination with =
only selected candidate? Should it be TCP/UDP/BFCP or something similar?
>=20
> =20
>=20
> Regards,
>=20
> _____________
> Roman Shpount
>=20
> =20
>=20
> =20
>=20
>=20
> _______________________________________________
> bfcpbis mailing list
> bfcpbis@ietf.org
> https://www.ietf.org/mailman/listinfo/bfcpbis


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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; -webkit-line-break: after-white-space;" =
class=3D"">Roman,<div class=3D""><br class=3D""></div><div class=3D"">Do =
any of those work for having both tcp and udp ICE candidates? I assume =
any with ICE (+ 4571 framing) would be acceptable for that =
case?</div><div class=3D""><br class=3D""></div><div class=3D"">Ideally =
we need to support the case where an answer=E2=80=99s m-line protocol =
does not match any of the candidates, so that an answer could only =
support TCP (say) when the offerer supported both (and used a UDP m-line =
protocol). If Christer=E2=80=99s proposed change which permitted an =
answer not to match the m-line protocol in the ICE candidates was =
accepted, that would resolve this case. Do you see any problems =
here?</div><div class=3D""><br class=3D""></div><div =
class=3D"">Regards,</div><div class=3D"">Alan</div><div class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
3 Jan 2017, at 20:08, Roman Shpount &lt;<a =
href=3D"mailto:roman@telurix.com" class=3D"">roman@telurix.com</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
dir=3D"ltr" class=3D"">Charles,<div class=3D""><br class=3D""></div><div =
class=3D"">I do not think not supporting ICE tcp candidates will quite =
work since it will reduce the usability considerably. The simplest way =
to move forward is to define a different transport tag for BFCP =
&nbsp;with RFC 4571 over TCP not to confuse it with TCP/BFCP. It can be =
TCP/UDP/BFCP (I know this looks strange and I am open to other =
suggestions, such as calling all packet based protocols =
DBFCP).&nbsp;</div><div class=3D""><br class=3D""></div><div class=3D"">In=
 general what I am proposing is:</div><div class=3D""><br =
class=3D""></div><div class=3D"">TCP/BFCP -- existing BFCP over =
TCP</div><div class=3D"">TLS/BFCP -- exisitng BFCP over TLS</div><div =
class=3D"">UDP/BFCP -- BFCP over UDP or ICE udp candidates</div><div =
class=3D"">TCP/UDP/BFCP -- BFCP with RFC 4571 framing&nbsp;over TCP or =
over ICE tcp candidates<br class=3D""></div><div class=3D"">UDP/DTLS/BFCP =
-- BFCP over DTLS or over ICE udp candidates</div><div =
class=3D"">TCP/DTLS/BFCP -- BFCP over DTLS with RFC 4571 =
framing&nbsp;over TCP or over ICE tcp candidates</div><div class=3D""><br =
class=3D""></div><div class=3D"">Legacy BFCP over TCP or TLS cannot work =
with ICE or NAT. Other protocols can work with NAT or ICE using normal =
ICE procedures.</div><div class=3D""><br class=3D""></div><div =
class=3D"">If we call all packet based protocols DBFCP then transport =
tags will be:</div><div class=3D""><br class=3D""></div><div =
class=3D""><div class=3D"">TCP/BFCP -- existing BFCP over TCP</div><div =
class=3D"">TLS/BFCP -- exisitng BFCP over TLS</div><div =
class=3D"">UDP/DBFCP -- DBFCP over UDP or ICE udp candidates</div><div =
class=3D"">TCP/DBFCP -- DBFCP with RFC 4571 framing&nbsp;over TCP or =
over ICE tcp candidates<br class=3D""></div><div class=3D"">UDP/DTLS/DBFCP=
 -- DBFCP over DTLS or over ICE udp candidates</div><div =
class=3D"">TCP/DTLS/DBFCP -- DBFCP over DTLS with RFC 4571 =
framing&nbsp;over TCP or over ICE tcp candidates</div><div class=3D""><br =
class=3D""></div></div><div class=3D"">Since BFCP over UDP (or other =
packet based protocols) is quite different due to timers and =
transmission restrictions, it can have a different transport tag and =
even be defined in a separate RFC.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Regards,</div></div><div =
class=3D"gmail_extra"><br clear=3D"all" class=3D""><div class=3D""><div =
class=3D"gmail_signature" =
data-smartmail=3D"gmail_signature">_____________<br class=3D"">Roman =
Shpount</div></div>
<br class=3D""><div class=3D"gmail_quote">On Tue, Jan 3, 2017 at 2:43 =
PM, Charles Eckel (eckelcu) <span dir=3D"ltr" class=3D"">&lt;<a =
href=3D"mailto:eckelcu@cisco.com" target=3D"_blank" =
class=3D"">eckelcu@cisco.com</a>&gt;</span> wrote:<br =
class=3D""><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 =
.8ex;border-left:1px #ccc solid;padding-left:1ex">







<div bgcolor=3D"white" lang=3D"EN-US" link=3D"blue" vlink=3D"purple" =
class=3D"">
<div class=3D"m_6178081229878505394WordSection1"><p =
class=3D"MsoNormal">Crickets=E2=80=A6<u class=3D""></u><u =
class=3D""></u></p><p class=3D"MsoNormal">If no one is or has plans for =
using ICE with TCP/BFCP, perhaps it is best to state that as of this rev =
of the BFCP spec, BFCP with TCP candidates is not defined. Future =
updates to the spec may define this usage.<u class=3D""></u><u =
class=3D""></u></p><p class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></p><p class=3D"MsoNormal">Cheers,<u class=3D""></u><u =
class=3D""></u></p><p class=3D"MsoNormal">Charles<u class=3D""></u><u =
class=3D""></u></p><p class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></p>
<blockquote style=3D"border:none;border-left:solid #b5c4df =
4.5pt;padding:0in 0in 0in 4.0pt;margin-left:3.75pt;margin-right:0in" =
class=3D"">
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt =
0in 0in 0in" class=3D""><p class=3D"MsoNormal"><b class=3D""><span =
style=3D"font-family: Calibri;" class=3D"">From: </span>
</b><span style=3D"font-family: Calibri;" class=3D"">mmusic &lt;<a =
href=3D"mailto:mmusic-bounces@ietf.org" target=3D"_blank" =
class=3D"">mmusic-bounces@ietf.org</a>&gt; on behalf of Charles Eckel =
&lt;<a href=3D"mailto:eckelcu@cisco.com" target=3D"_blank" =
class=3D"">eckelcu@cisco.com</a>&gt;<br class=3D"">
<b class=3D"">Date: </b>Friday, December 2, 2016 at 4:01 PM<br class=3D"">=

<b class=3D"">To: </b>Roman Shpount &lt;<a =
href=3D"mailto:roman@telurix.com" target=3D"_blank" =
class=3D"">roman@telurix.com</a>&gt;<br class=3D"">
<b class=3D"">Cc: </b>"<a href=3D"mailto:ice@ietf.org" target=3D"_blank" =
class=3D"">ice@ietf.org</a>" &lt;<a href=3D"mailto:ice@ietf.org" =
target=3D"_blank" class=3D"">ice@ietf.org</a>&gt;, "<a =
href=3D"mailto:bfcpbis@ietf.org" target=3D"_blank" =
class=3D"">bfcpbis@ietf.org</a>" &lt;<a href=3D"mailto:bfcpbis@ietf.org" =
target=3D"_blank" class=3D"">bfcpbis@ietf.org</a>&gt;, Christer Holmberg =
&lt;<a href=3D"mailto:christer.holmberg@ericsson.com" target=3D"_blank" =
class=3D"">christer.holmberg@ericsson.<wbr class=3D"">com</a>&gt;, "<a =
href=3D"mailto:mmusic@ietf.org" target=3D"_blank" =
class=3D"">mmusic@ietf.org</a>" &lt;<a href=3D"mailto:mmusic@ietf.org" =
target=3D"_blank" class=3D"">mmusic@ietf.org</a>&gt;<br class=3D"">
<b class=3D"">Subject: </b>Re: [MMUSIC] [bfcpbis] m=3D line protocol in =
case of ICE<u class=3D""></u><u class=3D""></u></span></p>
</div><div class=3D""><div class=3D"h5">
<div class=3D""><p class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></p>
</div><p class=3D"MsoNormal">I have no experience with ICE with TCP =
candidates so hopefully others can chime in as to what they think is a =
workable solution.
<u class=3D""></u><u class=3D""></u></p><p class=3D"MsoNormal">&nbsp;<u =
class=3D""></u><u class=3D""></u></p><p class=3D"MsoNormal">Cheers,<u =
class=3D""></u><u class=3D""></u></p><p class=3D"MsoNormal">Charles<u =
class=3D""></u><u class=3D""></u></p><p class=3D"MsoNormal">&nbsp;<u =
class=3D""></u><u class=3D""></u></p>
<blockquote style=3D"border:none;border-left:solid #b5c4df =
4.5pt;padding:0in 0in 0in =
4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5=
.0pt" class=3D"">
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt =
0in 0in 0in" class=3D""><p class=3D"MsoNormal"><b class=3D""><span =
style=3D"font-family: Calibri;" class=3D"">From: </span>
</b><span style=3D"font-family: Calibri;" class=3D"">Roman Shpount =
&lt;<a href=3D"mailto:roman@telurix.com" target=3D"_blank" =
class=3D"">roman@telurix.com</a>&gt;<br class=3D"">
<b class=3D"">Date: </b>Thursday, December 1, 2016 at 12:34 PM<br =
class=3D"">
<b class=3D"">To: </b>Charles Eckel &lt;<a =
href=3D"mailto:eckelcu@cisco.com" target=3D"_blank" =
class=3D"">eckelcu@cisco.com</a>&gt;<br class=3D"">
<b class=3D"">Cc: </b>Alan Ford &lt;<a href=3D"mailto:alan.ford@gmail.com"=
 target=3D"_blank" class=3D"">alan.ford@gmail.com</a>&gt;, "<a =
href=3D"mailto:bfcpbis@ietf.org" target=3D"_blank" =
class=3D"">bfcpbis@ietf.org</a>" &lt;<a href=3D"mailto:bfcpbis@ietf.org" =
target=3D"_blank" class=3D"">bfcpbis@ietf.org</a>&gt;, "<a =
href=3D"mailto:ice@ietf.org" target=3D"_blank" =
class=3D"">ice@ietf.org</a>" &lt;<a href=3D"mailto:ice@ietf.org" =
target=3D"_blank" class=3D"">ice@ietf.org</a>&gt;, "<a =
href=3D"mailto:mmusic@ietf.org" target=3D"_blank" =
class=3D"">mmusic@ietf.org</a>" &lt;<a href=3D"mailto:mmusic@ietf.org" =
target=3D"_blank" class=3D"">mmusic@ietf.org</a>&gt;, Christer Holmberg =
&lt;<a href=3D"mailto:christer.holmberg@ericsson.com" target=3D"_blank" =
class=3D"">christer.holmberg@ericsson.<wbr class=3D"">com</a>&gt;<br =
class=3D"">
<b class=3D"">Subject: </b>Re: [bfcpbis] [MMUSIC] m=3D line protocol in =
case of ICE</span><u class=3D""></u><u class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">&nbsp;<u class=3D""></u><u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Charles, <u class=3D""></u><u =
class=3D""></u></p>
<div class=3D""><p class=3D"MsoNormal">&nbsp;<u class=3D""></u><u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">RFC 6544 Sending Media (<a =
href=3D"https://tools.ietf.org/html/rfc6544#section-10.1" =
target=3D"_blank" class=3D"">https://tools.ietf.org/html/<wbr =
class=3D"">rfc6544#section-10.1</a>)&nbsp;says that "<span =
style=3D"font-size: 10pt;" class=3D"">The framing defined in
</span><a href=3D"https://tools.ietf.org/html/rfc4571" target=3D"_blank" =
class=3D""><span style=3D"font-size:10.0pt" class=3D"">RFC =
4571</span></a><span style=3D"font-size: 10pt;" class=3D""> MUST be used =
when sending media." This means the protocol used is not TCP/BFCP which =
is using application level
 framing. I believe that STUN/Media demultiplexing requirements would =
prevent using TCP/BFCP directly with ice tcp candidates without redesign =
of either ICE TCP or TCP/BFCP.</span><u class=3D""></u><u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">&nbsp;<u class=3D""></u><u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><span style=3D"font-size: 10pt;" =
class=3D"">Furthermore&nbsp;there are other implied ICE requirements =
that I outlined before (switching between udp and tpc candidates, =
existence of SBC which terminate ICE only but do not support the =
embedded
 protocol) because of which ice tcp is considered unreliable transport =
and will require fragmentation support and re-transmit timers that are =
not part of TCP/BFCP.</span><u class=3D""></u><u class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">&nbsp;<u class=3D""></u><u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><span style=3D"font-size: 10pt;" =
class=3D"">Regards,</span><u class=3D""></u><u class=3D""></u></p>
</div>
</div>
<div class=3D""><p class=3D"MsoNormal"><br clear=3D"all" class=3D"">
<u class=3D""></u><u class=3D""></u></p>
<div class=3D"">
<div class=3D""><p class=3D"MsoNormal">_____________<br class=3D"">
Roman Shpount<u class=3D""></u><u class=3D""></u></p>
</div>
</div><p class=3D"MsoNormal">&nbsp;<u class=3D""></u><u =
class=3D""></u></p>
<div class=3D""><p class=3D"MsoNormal">On Thu, Dec 1, 2016 at 3:17 PM, =
Charles Eckel (eckelcu) &lt;<a href=3D"mailto:eckelcu@cisco.com" =
target=3D"_blank" class=3D"">eckelcu@cisco.com</a>&gt; wrote:<u =
class=3D""></u><u class=3D""></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc =
1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.=
0pt" class=3D"">
<div class=3D"">
<div class=3D""><p class=3D"MsoNormal">Roman,<u class=3D""></u><u =
class=3D""></u></p><p class=3D"MsoNormal">&nbsp;<u class=3D""></u><u =
class=3D""></u></p><p class=3D"MsoNormal">Why would selecting TCP/BFCP =
as transport violate RFC 6544? Perhaps it does, but after a quick scan I =
am not sure why.<u class=3D""></u><u class=3D""></u></p><p =
class=3D"MsoNormal">&nbsp;<u class=3D""></u><u class=3D""></u></p><p =
class=3D"MsoNormal">Cheers,<u class=3D""></u><u class=3D""></u></p><p =
class=3D"MsoNormal">Charles<u class=3D""></u><u class=3D""></u></p><p =
class=3D"MsoNormal">&nbsp;<u class=3D""></u><u class=3D""></u></p>
<blockquote style=3D"border:none;border-left:solid #b5c4df =
4.5pt;padding:0in 0in 0in =
4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5=
.0pt" class=3D"">
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt =
0in 0in 0in" class=3D""><p class=3D"MsoNormal"><b class=3D""><span =
style=3D"font-family: Calibri;" class=3D"">From:
</span></b><span style=3D"font-family: Calibri;" class=3D"">Roman =
Shpount &lt;<a href=3D"mailto:roman@telurix.com" target=3D"_blank" =
class=3D"">roman@telurix.com</a>&gt;<br class=3D"">
<b class=3D"">Date: </b>Tuesday, November 29, 2016 at 10:38 AM<br =
class=3D"">
<b class=3D"">To: </b>Charles Eckel &lt;<a =
href=3D"mailto:eckelcu@cisco.com" target=3D"_blank" =
class=3D"">eckelcu@cisco.com</a>&gt;<br class=3D"">
<b class=3D"">Cc: </b>Alan Ford &lt;<a href=3D"mailto:alan.ford@gmail.com"=
 target=3D"_blank" class=3D"">alan.ford@gmail.com</a>&gt;, "<a =
href=3D"mailto:bfcpbis@ietf.org" target=3D"_blank" =
class=3D"">bfcpbis@ietf.org</a>" &lt;<a href=3D"mailto:bfcpbis@ietf.org" =
target=3D"_blank" class=3D"">bfcpbis@ietf.org</a>&gt;, "<a =
href=3D"mailto:ice@ietf.org" target=3D"_blank" =
class=3D"">ice@ietf.org</a>"
 &lt;<a href=3D"mailto:ice@ietf.org" target=3D"_blank" =
class=3D"">ice@ietf.org</a>&gt;, "<a href=3D"mailto:mmusic@ietf.org" =
target=3D"_blank" class=3D"">mmusic@ietf.org</a>" &lt;<a =
href=3D"mailto:mmusic@ietf.org" target=3D"_blank" =
class=3D"">mmusic@ietf.org</a>&gt;, Christer Holmberg &lt;<a =
href=3D"mailto:christer.holmberg@ericsson.com" target=3D"_blank" =
class=3D"">christer.holmberg@ericsson.<wbr class=3D"">com</a>&gt;<br =
class=3D"">
<b class=3D"">Subject: </b>Re: [bfcpbis] [MMUSIC] m=3D line protocol in =
case of ICE</span><u class=3D""></u><u class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">&nbsp;<u class=3D""></u><u =
class=3D""></u></p>
</div>
<div class=3D"">
<div class=3D"">
<div class=3D"">
<div class=3D""><p class=3D"MsoNormal">On Tue, Nov 29, 2016 at 12:48 PM, =
Charles Eckel (eckelcu) &lt;<a href=3D"mailto:eckelcu@cisco.com" =
target=3D"_blank" class=3D"">eckelcu@cisco.com</a>&gt; wrote:<u =
class=3D""></u><u class=3D""></u></p>
</div>
</div>
<div class=3D"">
<div class=3D"">
<div class=3D"">
<blockquote style=3D"border:none;border-left:solid #cccccc =
1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.=
0pt" class=3D"">
<div class=3D"">
<div class=3D""><p class=3D"MsoNormal">It seems to me that the most =
straightforward approach would be to mandate support for BFCP over UDP =
when using ICE, use UDP as the default candidate, and signal the BFCP =
m-line
 as if it is BFCP over UDP. If we can mandate the use of DTLS, that =
would be even better.<u class=3D""></u><u class=3D""></u></p><p =
class=3D"MsoNormal">Thoughts?<u class=3D""></u><u class=3D""></u></p><p =
class=3D"MsoNormal">&nbsp;<u class=3D""></u><u class=3D""></u></p>
</div>
</div>
</blockquote>
<div class=3D""><p class=3D"MsoNormal">&nbsp;<u class=3D""></u><u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">I agree.<u class=3D""></u><u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">&nbsp;<u class=3D""></u><u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">The only issue that I still have, =
if DTLS is not used, what protocol is used when ICE tcp candidate =
is&nbsp;selected for transport. Is this TCP/BFCP (which goes against =
RFC6544) &nbsp;or
 is it UDP/BFCP with RFC4571 framing? If it is UDP/BFCP with RFC4571 =
framing, what transport tag should be used in the re-INVITE which is =
sent after ICE nomination with only selected candidate? Should it be =
TCP/UDP/BFCP or something similar?<u class=3D""></u><u class=3D""></u></p>=

</div>
<div class=3D""><p class=3D"MsoNormal">&nbsp;<u class=3D""></u><u =
class=3D""></u></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Regards,<u class=3D""></u><u =
class=3D""></u></p>
</div>
<div class=3D"">
<div class=3D""><p class=3D"MsoNormal">_____________<br class=3D"">
Roman Shpount<u class=3D""></u><u class=3D""></u></p>
</div>
</div>
<div class=3D""><p class=3D"MsoNormal">&nbsp;<u class=3D""></u><u =
class=3D""></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
</div><p class=3D"MsoNormal">&nbsp;<u class=3D""></u><u =
class=3D""></u></p>
</div>
</blockquote>
</div></div></blockquote>
</div>
</div>

</blockquote></div><br class=3D""></div>
_______________________________________________<br class=3D"">bfcpbis =
mailing list<br class=3D""><a href=3D"mailto:bfcpbis@ietf.org" =
class=3D"">bfcpbis@ietf.org</a><br =
class=3D"">https://www.ietf.org/mailman/listinfo/bfcpbis<br =
class=3D""></div></blockquote></div><br class=3D""></div></body></html>=

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From: Roman Shpount <roman@telurix.com>
Date: Tue, 3 Jan 2017 18:44:54 -0500
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To: Alan Ford <alan.ford@gmail.com>
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Subject: Re: [bfcpbis] [MMUSIC] m= line protocol in case of ICE
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Alan,

TCP/BFCP and TLS/BFCP will not work with ICE. Or, to be more precise, will
not work without some specification changes either in ICE tcp or in BFCP.

One pair of protocols which will work with ICE is UDP/DTLS/BFCP and
TCP/DTLS/BFCP.
It will support both tcp and udp candidates. I think this pair should be
recommended since it provides encryption.

Another pair that will work with ICE is UDP/BFCP and TCP/UDP/BFCP. It will
also support tcp and udp candidates. It is not something I would use over
public internet since it will transmit data in the clear text.

Finally, I prefer that any end point which implement BFCP and supports ICE
and DTLS, MUST support UDP/DTLS/BFCP and use it for default candidate. Any
endpoint which implements BFCP and ICE, but does not support DTLS, MUST
support UDP/BFCP and use it as a default candidate.

Once the ICE candidate pair is selected, the transport matching the
selected candidate pair should be used in the SDP.

There is no practical need for the asymmetric transport tags. I think the
whole thing is coming from  the confusion that TCP/BFCP can be used with
ICE tcp candidates. It cannot without some specification changes. Also,
there is no reason to use TCP/DTLS/BFCP or TCP/UDP/BFCP, unless ICE is
used. Because of this, there is no reason to use either of those transports
for default candidate, since default candidate is selected for interop with
end points not supporting ICE.

Regards,

_____________
Roman Shpount

On Tue, Jan 3, 2017 at 6:23 PM, Alan Ford <alan.ford@gmail.com> wrote:

> Roman,
>
> Do any of those work for having both tcp and udp ICE candidates? I assume
> any with ICE (+ 4571 framing) would be acceptable for that case?
>
> Ideally we need to support the case where an answer=E2=80=99s m-line prot=
ocol does
> not match any of the candidates, so that an answer could only support TCP
> (say) when the offerer supported both (and used a UDP m-line protocol). I=
f
> Christer=E2=80=99s proposed change which permitted an answer not to match=
 the
> m-line protocol in the ICE candidates was accepted, that would resolve th=
is
> case. Do you see any problems here?
>
> Regards,
> Alan
>
> On 3 Jan 2017, at 20:08, Roman Shpount <roman@telurix.com> wrote:
>
> Charles,
>
> I do not think not supporting ICE tcp candidates will quite work since it
> will reduce the usability considerably. The simplest way to move forward =
is
> to define a different transport tag for BFCP  with RFC 4571 over TCP not =
to
> confuse it with TCP/BFCP. It can be TCP/UDP/BFCP (I know this looks stran=
ge
> and I am open to other suggestions, such as calling all packet based
> protocols DBFCP).
>
> In general what I am proposing is:
>
> TCP/BFCP -- existing BFCP over TCP
> TLS/BFCP -- exisitng BFCP over TLS
> UDP/BFCP -- BFCP over UDP or ICE udp candidates
> TCP/UDP/BFCP -- BFCP with RFC 4571 framing over TCP or over ICE tcp
> candidates
> UDP/DTLS/BFCP -- BFCP over DTLS or over ICE udp candidates
> TCP/DTLS/BFCP -- BFCP over DTLS with RFC 4571 framing over TCP or over IC=
E
> tcp candidates
>
> Legacy BFCP over TCP or TLS cannot work with ICE or NAT. Other protocols
> can work with NAT or ICE using normal ICE procedures.
>
> If we call all packet based protocols DBFCP then transport tags will be:
>
> TCP/BFCP -- existing BFCP over TCP
> TLS/BFCP -- exisitng BFCP over TLS
> UDP/DBFCP -- DBFCP over UDP or ICE udp candidates
> TCP/DBFCP -- DBFCP with RFC 4571 framing over TCP or over ICE tcp
> candidates
> UDP/DTLS/DBFCP -- DBFCP over DTLS or over ICE udp candidates
> TCP/DTLS/DBFCP -- DBFCP over DTLS with RFC 4571 framing over TCP or over
> ICE tcp candidates
>
> Since BFCP over UDP (or other packet based protocols) is quite different
> due to timers and transmission restrictions, it can have a different
> transport tag and even be defined in a separate RFC.
>
> Regards,
>
> _____________
> Roman Shpount
>
> On Tue, Jan 3, 2017 at 2:43 PM, Charles Eckel (eckelcu) <eckelcu@cisco.co=
m
> > wrote:
>
>> Crickets=E2=80=A6
>>
>> If no one is or has plans for using ICE with TCP/BFCP, perhaps it is bes=
t
>> to state that as of this rev of the BFCP spec, BFCP with TCP candidates =
is
>> not defined. Future updates to the spec may define this usage.
>>
>>
>>
>> Cheers,
>>
>> Charles
>>
>>
>>
>> *From: *mmusic <mmusic-bounces@ietf.org> on behalf of Charles Eckel <
>> eckelcu@cisco.com>
>> *Date: *Friday, December 2, 2016 at 4:01 PM
>> *To: *Roman Shpount <roman@telurix.com>
>> *Cc: *"ice@ietf.org" <ice@ietf.org>, "bfcpbis@ietf.org" <bfcpbis@ietf.or=
g>,
>> Christer Holmberg <christer.holmberg@ericsson.com>, "mmusic@ietf.org" <
>> mmusic@ietf.org>
>> *Subject: *Re: [MMUSIC] [bfcpbis] m=3D line protocol in case of ICE
>>
>>
>>
>> I have no experience with ICE with TCP candidates so hopefully others ca=
n
>> chime in as to what they think is a workable solution.
>>
>>
>>
>> Cheers,
>>
>> Charles
>>
>>
>>
>> *From: *Roman Shpount <roman@telurix.com>
>> *Date: *Thursday, December 1, 2016 at 12:34 PM
>> *To: *Charles Eckel <eckelcu@cisco.com>
>> *Cc: *Alan Ford <alan.ford@gmail.com>, "bfcpbis@ietf.org" <
>> bfcpbis@ietf.org>, "ice@ietf.org" <ice@ietf.org>, "mmusic@ietf.org" <
>> mmusic@ietf.org>, Christer Holmberg <christer.holmberg@ericsson.com>
>> *Subject: *Re: [bfcpbis] [MMUSIC] m=3D line protocol in case of ICE
>>
>>
>>
>> Charles,
>>
>>
>>
>> RFC 6544 Sending Media (https://tools.ietf.org/html/rfc6544#section-10.1=
) says
>> that "The framing defined in RFC 4571
>> <https://tools.ietf.org/html/rfc4571> MUST be used when sending media."
>> This means the protocol used is not TCP/BFCP which is using application
>> level framing. I believe that STUN/Media demultiplexing requirements wou=
ld
>> prevent using TCP/BFCP directly with ice tcp candidates without redesign=
 of
>> either ICE TCP or TCP/BFCP.
>>
>>
>>
>> Furthermore there are other implied ICE requirements that I outlined
>> before (switching between udp and tpc candidates, existence of SBC which
>> terminate ICE only but do not support the embedded protocol) because of
>> which ice tcp is considered unreliable transport and will require
>> fragmentation support and re-transmit timers that are not part of TCP/BF=
CP.
>>
>>
>>
>> Regards,
>>
>>
>> _____________
>> Roman Shpount
>>
>>
>>
>> On Thu, Dec 1, 2016 at 3:17 PM, Charles Eckel (eckelcu) <
>> eckelcu@cisco.com> wrote:
>>
>> Roman,
>>
>>
>>
>> Why would selecting TCP/BFCP as transport violate RFC 6544? Perhaps it
>> does, but after a quick scan I am not sure why.
>>
>>
>>
>> Cheers,
>>
>> Charles
>>
>>
>>
>> *From: *Roman Shpount <roman@telurix.com>
>> *Date: *Tuesday, November 29, 2016 at 10:38 AM
>> *To: *Charles Eckel <eckelcu@cisco.com>
>> *Cc: *Alan Ford <alan.ford@gmail.com>, "bfcpbis@ietf.org" <
>> bfcpbis@ietf.org>, "ice@ietf.org" <ice@ietf.org>, "mmusic@ietf.org" <
>> mmusic@ietf.org>, Christer Holmberg <christer.holmberg@ericsson.com>
>> *Subject: *Re: [bfcpbis] [MMUSIC] m=3D line protocol in case of ICE
>>
>>
>>
>> On Tue, Nov 29, 2016 at 12:48 PM, Charles Eckel (eckelcu) <
>> eckelcu@cisco.com> wrote:
>>
>> It seems to me that the most straightforward approach would be to mandat=
e
>> support for BFCP over UDP when using ICE, use UDP as the default candida=
te,
>> and signal the BFCP m-line as if it is BFCP over UDP. If we can mandate =
the
>> use of DTLS, that would be even better.
>>
>> Thoughts?
>>
>>
>>
>>
>>
>> I agree.
>>
>>
>>
>> The only issue that I still have, if DTLS is not used, what protocol is
>> used when ICE tcp candidate is selected for transport. Is this TCP/BFCP
>> (which goes against RFC6544)  or is it UDP/BFCP with RFC4571 framing? If=
 it
>> is UDP/BFCP with RFC4571 framing, what transport tag should be used in t=
he
>> re-INVITE which is sent after ICE nomination with only selected candidat=
e?
>> Should it be TCP/UDP/BFCP or something similar?
>>
>>
>>
>> Regards,
>>
>> _____________
>> Roman Shpount
>>
>>
>>
>>
>>
>>
> _______________________________________________
> bfcpbis mailing list
> bfcpbis@ietf.org
> https://www.ietf.org/mailman/listinfo/bfcpbis
>
>
>

--94eb2c0830de5493180545394135
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Alan,<div><br></div><div><span style=3D"color:rgb(0,0,0);f=
ont-size:12.8px">TCP/BFCP and=C2=A0</span><span style=3D"color:rgb(0,0,0);f=
ont-size:12.8px">TLS/BFCP will not work with ICE. Or, to be more precise, w=
ill not work without some specification changes either in ICE tcp or in BFC=
P.</span></div><div><span style=3D"color:rgb(0,0,0);font-size:12.8px"><br><=
/span></div><div><span style=3D"color:rgb(0,0,0);font-size:12.8px">One pair=
 of protocols which will work with ICE is UDP/DTLS/BFCP and=C2=A0</span><fo=
nt color=3D"#000000"><span style=3D"font-size:12.8px">TCP/DTLS/BFCP. It wil=
l support both tcp and udp candidates. I think this pair should be recommen=
ded since it provides encryption.=C2=A0</span></font></div><div><font color=
=3D"#000000"><span style=3D"font-size:12.8px"><br></span></font></div><div>=
<font color=3D"#000000"><span style=3D"font-size:12.8px">Another pair that =
will work with ICE is=C2=A0</span></font><span style=3D"color:rgb(0,0,0);fo=
nt-size:12.8px">UDP/BFCP and=C2=A0</span><span style=3D"color:rgb(0,0,0);fo=
nt-size:12.8px">TCP/UDP/BFCP. It will also support tcp and udp candidates. =
It is not something I would use over public internet since it will transmit=
 data in the clear text.</span><br></div><div><span style=3D"color:rgb(0,0,=
0);font-size:12.8px"><br></span></div><div><span style=3D"color:rgb(0,0,0);=
font-size:12.8px">Finally, I prefer that any end point which implement BFCP=
 and supports ICE and DTLS, MUST support=C2=A0</span><span style=3D"color:r=
gb(0,0,0);font-size:12.8px">UDP/DTLS/BFCP and use it</span><font color=3D"#=
000000"><span style=3D"font-size:12.8px">=C2=A0for default candidate. Any e=
ndpoint which implements=C2=A0BFCP and ICE, but does not support DTLS, MUST=
 support UDP/BFCP and use it as a default candidate.=C2=A0</span></font></d=
iv><div><font color=3D"#000000"><span style=3D"font-size:12.8px"><br></span=
></font></div><div><font color=3D"#000000"><span style=3D"font-size:12.8px"=
>Once the ICE candidate pair is selected, the transport matching the select=
ed candidate pair should be used in the SDP.</span></font></div><div><font =
color=3D"#000000"><span style=3D"font-size:12.8px"><br></span></font></div>=
<div><font color=3D"#000000"><span style=3D"font-size:12.8px">There is no p=
ractical need for the asymmetric transport tags. I think the whole thing is=
 coming from =C2=A0the confusion that TCP/BFCP can be used with ICE tcp can=
didates. It cannot without some specification changes. Also, there is no re=
ason to use=C2=A0</span></font><span style=3D"color:rgb(0,0,0);font-size:12=
.8px">TCP/DTLS/BFCP or=C2=A0</span><span style=3D"color:rgb(0,0,0);font-siz=
e:12.8px">TCP/UDP/BFCP, unless ICE is used. Because of this, there is no re=
ason to use either of those transports for default candidate, since default=
 candidate is selected for interop with end points not supporting ICE.</spa=
n></div><div><font color=3D"#000000"><span style=3D"font-size:12.8px"><br><=
/span></font></div><div><font color=3D"#000000"><span style=3D"font-size:12=
.8px">Regards,</span></font></div></div><div class=3D"gmail_extra"><br clea=
r=3D"all"><div><div class=3D"gmail_signature" data-smartmail=3D"gmail_signa=
ture">_____________<br>Roman Shpount</div></div>
<br><div class=3D"gmail_quote">On Tue, Jan 3, 2017 at 6:23 PM, Alan Ford <s=
pan dir=3D"ltr">&lt;<a href=3D"mailto:alan.ford@gmail.com" target=3D"_blank=
">alan.ford@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"><div style=3D"word-wrap:break-word">Roman,<div><br></div><div>Do any of =
those work for having both tcp and udp ICE candidates? I assume any with IC=
E (+ 4571 framing) would be acceptable for that case?</div><div><br></div><=
div>Ideally we need to support the case where an answer=E2=80=99s m-line pr=
otocol does not match any of the candidates, so that an answer could only s=
upport TCP (say) when the offerer supported both (and used a UDP m-line pro=
tocol). If Christer=E2=80=99s proposed change which permitted an answer not=
 to match the m-line protocol in the ICE candidates was accepted, that woul=
d resolve this case. Do you see any problems here?</div><div><br></div><div=
>Regards,</div><div>Alan</div><div><br><div><blockquote type=3D"cite"><div>=
<div class=3D"h5"><div>On 3 Jan 2017, at 20:08, Roman Shpount &lt;<a href=
=3D"mailto:roman@telurix.com" target=3D"_blank">roman@telurix.com</a>&gt; w=
rote:</div><br class=3D"m_-4860766982300894496Apple-interchange-newline"></=
div></div><div><div><div class=3D"h5"><div dir=3D"ltr">Charles,<div><br></d=
iv><div>I do not think not supporting ICE tcp candidates will quite work si=
nce it will reduce the usability considerably. The simplest way to move for=
ward is to define a different transport tag for BFCP =C2=A0with RFC 4571 ov=
er TCP not to confuse it with TCP/BFCP. It can be TCP/UDP/BFCP (I know this=
 looks strange and I am open to other suggestions, such as calling all pack=
et based protocols DBFCP).=C2=A0</div><div><br></div><div>In general what I=
 am proposing is:</div><div><br></div><div>TCP/BFCP -- existing BFCP over T=
CP</div><div>TLS/BFCP -- exisitng BFCP over TLS</div><div>UDP/BFCP -- BFCP =
over UDP or ICE udp candidates</div><div>TCP/UDP/BFCP -- BFCP with RFC 4571=
 framing=C2=A0over TCP or over ICE tcp candidates<br></div><div>UDP/DTLS/BF=
CP -- BFCP over DTLS or over ICE udp candidates</div><div>TCP/DTLS/BFCP -- =
BFCP over DTLS with RFC 4571 framing=C2=A0over TCP or over ICE tcp candidat=
es</div><div><br></div><div>Legacy BFCP over TCP or TLS cannot work with IC=
E or NAT. Other protocols can work with NAT or ICE using normal ICE procedu=
res.</div><div><br></div><div>If we call all packet based protocols DBFCP t=
hen transport tags will be:</div><div><br></div><div><div>TCP/BFCP -- exist=
ing BFCP over TCP</div><div>TLS/BFCP -- exisitng BFCP over TLS</div><div>UD=
P/DBFCP -- DBFCP over UDP or ICE udp candidates</div><div>TCP/DBFCP -- DBFC=
P with RFC 4571 framing=C2=A0over TCP or over ICE tcp candidates<br></div><=
div>UDP/DTLS/DBFCP -- DBFCP over DTLS or over ICE udp candidates</div><div>=
TCP/DTLS/DBFCP -- DBFCP over DTLS with RFC 4571 framing=C2=A0over TCP or ov=
er ICE tcp candidates</div><div><br></div></div><div>Since BFCP over UDP (o=
r other packet based protocols) is quite different due to timers and transm=
ission restrictions, it can have a different transport tag and even be defi=
ned in a separate RFC.</div><div><br></div><div>Regards,</div></div><div cl=
ass=3D"gmail_extra"><br clear=3D"all"><div><div class=3D"m_-486076698230089=
4496gmail_signature" data-smartmail=3D"gmail_signature">_____________<br>Ro=
man Shpount</div></div>
<br><div class=3D"gmail_quote">On Tue, Jan 3, 2017 at 2:43 PM, Charles Ecke=
l (eckelcu) <span dir=3D"ltr">&lt;<a href=3D"mailto:eckelcu@cisco.com" targ=
et=3D"_blank">eckelcu@cisco.com</a>&gt;</span> wrote:<br><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">







<div bgcolor=3D"white" lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-4860766982300894496m_6178081229878505394WordSection1"><p c=
lass=3D"MsoNormal">Crickets=E2=80=A6<u></u><u></u></p><p class=3D"MsoNormal=
">If no one is or has plans for using ICE with TCP/BFCP, perhaps it is best=
 to state that as of this rev of the BFCP spec, BFCP with TCP candidates is=
 not defined. Future updates to the spec may define this usage.<u></u><u></=
u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal"=
>Cheers,<u></u><u></u></p><p class=3D"MsoNormal">Charles<u></u><u></u></p><=
p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<blockquote style=3D"border:none;border-left:solid #b5c4df 4.5pt;padding:0i=
n 0in 0in 4.0pt;margin-left:3.75pt;margin-right:0in">
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in"><p class=3D"MsoNormal"><b><span style=3D"font-family:Calibri">From=
: </span>
</b><span style=3D"font-family:Calibri">mmusic &lt;<a href=3D"mailto:mmusic=
-bounces@ietf.org" target=3D"_blank">mmusic-bounces@ietf.org</a>&gt; on beh=
alf of Charles Eckel &lt;<a href=3D"mailto:eckelcu@cisco.com" target=3D"_bl=
ank">eckelcu@cisco.com</a>&gt;<br>
<b>Date: </b>Friday, December 2, 2016 at 4:01 PM<br>
<b>To: </b>Roman Shpount &lt;<a href=3D"mailto:roman@telurix.com" target=3D=
"_blank">roman@telurix.com</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:ice@ietf.org" target=3D"_blank">ice@ietf=
.org</a>&quot; &lt;<a href=3D"mailto:ice@ietf.org" target=3D"_blank">ice@ie=
tf.org</a>&gt;, &quot;<a href=3D"mailto:bfcpbis@ietf.org" target=3D"_blank"=
>bfcpbis@ietf.org</a>&quot; &lt;<a href=3D"mailto:bfcpbis@ietf.org" target=
=3D"_blank">bfcpbis@ietf.org</a>&gt;, Christer Holmberg &lt;<a href=3D"mail=
to:christer.holmberg@ericsson.com" target=3D"_blank">christer.holmberg@eric=
sson.co<wbr>m</a>&gt;, &quot;<a href=3D"mailto:mmusic@ietf.org" target=3D"_=
blank">mmusic@ietf.org</a>&quot; &lt;<a href=3D"mailto:mmusic@ietf.org" tar=
get=3D"_blank">mmusic@ietf.org</a>&gt;<br>
<b>Subject: </b>Re: [MMUSIC] [bfcpbis] m=3D line protocol in case of ICE<u>=
</u><u></u></span></p>
</div><div><div class=3D"m_-4860766982300894496h5">
<div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div><p class=3D"MsoNormal">I have no experience with ICE with TCP candida=
tes so hopefully others can chime in as to what they think is a workable so=
lution.
<u></u><u></u></p><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p><p class=
=3D"MsoNormal">Cheers,<u></u><u></u></p><p class=3D"MsoNormal">Charles<u></=
u><u></u></p><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #b5c4df 4.5pt;padding:0i=
n 0in 0in 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin=
-bottom:5.0pt">
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in"><p class=3D"MsoNormal"><b><span style=3D"font-family:Calibri">From=
: </span>
</b><span style=3D"font-family:Calibri">Roman Shpount &lt;<a href=3D"mailto=
:roman@telurix.com" target=3D"_blank">roman@telurix.com</a>&gt;<br>
<b>Date: </b>Thursday, December 1, 2016 at 12:34 PM<br>
<b>To: </b>Charles Eckel &lt;<a href=3D"mailto:eckelcu@cisco.com" target=3D=
"_blank">eckelcu@cisco.com</a>&gt;<br>
<b>Cc: </b>Alan Ford &lt;<a href=3D"mailto:alan.ford@gmail.com" target=3D"_=
blank">alan.ford@gmail.com</a>&gt;, &quot;<a href=3D"mailto:bfcpbis@ietf.or=
g" target=3D"_blank">bfcpbis@ietf.org</a>&quot; &lt;<a href=3D"mailto:bfcpb=
is@ietf.org" target=3D"_blank">bfcpbis@ietf.org</a>&gt;, &quot;<a href=3D"m=
ailto:ice@ietf.org" target=3D"_blank">ice@ietf.org</a>&quot; &lt;<a href=3D=
"mailto:ice@ietf.org" target=3D"_blank">ice@ietf.org</a>&gt;, &quot;<a href=
=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic@ietf.org</a>&quot; &lt=
;<a href=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic@ietf.org</a>&g=
t;, Christer Holmberg &lt;<a href=3D"mailto:christer.holmberg@ericsson.com"=
 target=3D"_blank">christer.holmberg@ericsson.co<wbr>m</a>&gt;<br>
<b>Subject: </b>Re: [bfcpbis] [MMUSIC] m=3D line protocol in case of ICE</s=
pan><u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal">Charles, <u></u><u></u></p>
<div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal">RFC 6544 Sending Media (<a href=3D"https://tool=
s.ietf.org/html/rfc6544#section-10.1" target=3D"_blank">https://tools.ietf.=
org/html/r<wbr>fc6544#section-10.1</a>)=C2=A0says that &quot;<span style=3D=
"font-size:10pt">The framing defined in
</span><a href=3D"https://tools.ietf.org/html/rfc4571" target=3D"_blank"><s=
pan style=3D"font-size:10.0pt">RFC 4571</span></a><span style=3D"font-size:=
10pt"> MUST be used when sending media.&quot; This means the protocol used =
is not TCP/BFCP which is using application level
 framing. I believe that STUN/Media demultiplexing requirements would preve=
nt using TCP/BFCP directly with ice tcp candidates without redesign of eith=
er ICE TCP or TCP/BFCP.</span><u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal"><span style=3D"font-size:10pt">Furthermore=C2=
=A0there are other implied ICE requirements that I outlined before (switchi=
ng between udp and tpc candidates, existence of SBC which terminate ICE onl=
y but do not support the embedded
 protocol) because of which ice tcp is considered unreliable transport and =
will require fragmentation support and re-transmit timers that are not part=
 of TCP/BFCP.</span><u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal"><span style=3D"font-size:10pt">Regards,</span><=
u></u><u></u></p>
</div>
</div>
<div><p class=3D"MsoNormal"><br clear=3D"all">
<u></u><u></u></p>
<div>
<div><p class=3D"MsoNormal">_____________<br>
Roman Shpount<u></u><u></u></p>
</div>
</div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div><p class=3D"MsoNormal">On Thu, Dec 1, 2016 at 3:17 PM, Charles Eckel (=
eckelcu) &lt;<a href=3D"mailto:eckelcu@cisco.com" target=3D"_blank">eckelcu=
@cisco.com</a>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div><p class=3D"MsoNormal">Roman,<u></u><u></u></p><p class=3D"MsoNormal">=
=C2=A0<u></u><u></u></p><p class=3D"MsoNormal">Why would selecting TCP/BFCP=
 as transport violate RFC 6544? Perhaps it does, but after a quick scan I a=
m not sure why.<u></u><u></u></p><p class=3D"MsoNormal">=C2=A0<u></u><u></u=
></p><p class=3D"MsoNormal">Cheers,<u></u><u></u></p><p class=3D"MsoNormal"=
>Charles<u></u><u></u></p><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #b5c4df 4.5pt;padding:0i=
n 0in 0in 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin=
-bottom:5.0pt">
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in"><p class=3D"MsoNormal"><b><span style=3D"font-family:Calibri">From=
:
</span></b><span style=3D"font-family:Calibri">Roman Shpount &lt;<a href=3D=
"mailto:roman@telurix.com" target=3D"_blank">roman@telurix.com</a>&gt;<br>
<b>Date: </b>Tuesday, November 29, 2016 at 10:38 AM<br>
<b>To: </b>Charles Eckel &lt;<a href=3D"mailto:eckelcu@cisco.com" target=3D=
"_blank">eckelcu@cisco.com</a>&gt;<br>
<b>Cc: </b>Alan Ford &lt;<a href=3D"mailto:alan.ford@gmail.com" target=3D"_=
blank">alan.ford@gmail.com</a>&gt;, &quot;<a href=3D"mailto:bfcpbis@ietf.or=
g" target=3D"_blank">bfcpbis@ietf.org</a>&quot; &lt;<a href=3D"mailto:bfcpb=
is@ietf.org" target=3D"_blank">bfcpbis@ietf.org</a>&gt;, &quot;<a href=3D"m=
ailto:ice@ietf.org" target=3D"_blank">ice@ietf.org</a>&quot;
 &lt;<a href=3D"mailto:ice@ietf.org" target=3D"_blank">ice@ietf.org</a>&gt;=
, &quot;<a href=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic@ietf.or=
g</a>&quot; &lt;<a href=3D"mailto:mmusic@ietf.org" target=3D"_blank">mmusic=
@ietf.org</a>&gt;, Christer Holmberg &lt;<a href=3D"mailto:christer.holmber=
g@ericsson.com" target=3D"_blank">christer.holmberg@ericsson.co<wbr>m</a>&g=
t;<br>
<b>Subject: </b>Re: [bfcpbis] [MMUSIC] m=3D line protocol in case of ICE</s=
pan><u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<div>
<div>
<div><p class=3D"MsoNormal">On Tue, Nov 29, 2016 at 12:48 PM, Charles Eckel=
 (eckelcu) &lt;<a href=3D"mailto:eckelcu@cisco.com" target=3D"_blank">eckel=
cu@cisco.com</a>&gt; wrote:<u></u><u></u></p>
</div>
</div>
<div>
<div>
<div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div><p class=3D"MsoNormal">It seems to me that the most straightforward ap=
proach would be to mandate support for BFCP over UDP when using ICE, use UD=
P as the default candidate, and signal the BFCP m-line
 as if it is BFCP over UDP. If we can mandate the use of DTLS, that would b=
e even better.<u></u><u></u></p><p class=3D"MsoNormal">Thoughts?<u></u><u><=
/u></p><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</blockquote>
<div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal">I agree.<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal">The only issue that I still have, if DTLS is no=
t used, what protocol is used when ICE tcp candidate is=C2=A0selected for t=
ransport. Is this TCP/BFCP (which goes against RFC6544) =C2=A0or
 is it UDP/BFCP with RFC4571 framing? If it is UDP/BFCP with RFC4571 framin=
g, what transport tag should be used in the re-INVITE which is sent after I=
CE nomination with only selected candidate? Should it be TCP/UDP/BFCP or so=
mething similar?<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div><p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<div><p class=3D"MsoNormal">_____________<br>
Roman Shpount<u></u><u></u></p>
</div>
</div>
<div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
</div><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</blockquote>
</div></div></blockquote>
</div>
</div>

</blockquote></div><br></div></div></div>
______________________________<wbr>_________________<br>bfcpbis mailing lis=
t<br><a href=3D"mailto:bfcpbis@ietf.org" target=3D"_blank">bfcpbis@ietf.org=
</a><br><a href=3D"https://www.ietf.org/mailman/listinfo/bfcpbis" target=3D=
"_blank">https://www.ietf.org/mailman/<wbr>listinfo/bfcpbis</a><br></div></=
blockquote></div><br></div></div></blockquote></div><br></div>

--94eb2c0830de5493180545394135--


From nobody Wed Jan  4 14:36:06 2017
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From: Robert Sparks <rjsparks@nostrum.com>
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Cc: draft-ietf-bfcpbis-bfcp-websocket.all@ietf.org, bfcpbis@ietf.org, ietf@ietf.org
Subject: [bfcpbis] Review of draft-ietf-bfcpbis-bfcp-websocket-13
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Reviewer: Robert Sparks
Review result: Ready with Issues

I am the assigned Gen-ART reviewer for this draft. The General Area
Review Team (Gen-ART) reviews all IETF documents being processed
by the IESG for the IETF Chair.  Please treat these comments just
like any other last call comments.

For more information, please see the FAQ at
<https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.

Document: draft-ietf-bfcpbis-bfcp-websocket13-
Reviewer: Robert Sparks
Review Date: 2017-01-04
IETF LC End Date: 2017-01-11
IESG Telechat date: 2017-01-19

Summary: Basically ready but with issues that need to be addressed
before publication as a Proposed Standard

Issues: 

The BFCP spec (at draft-ietf-bfcpbis-rfc4582bis) relies heavily on
recommendations it makes about the use of TLS or DTLS, and even goes
to
the point of specifyig a particular set of cipher suites to use wih
those protocols when using them with BFCP. The security
considerations
section of that document details some specific attacks and how the
use
of TLS/DTLS mitigates them (providing some justification for the
cipher
suites that the document specifies).

This document provides a _COMPLETELY DIFFERENT_ security mechanism
(essentially punting entirely to whatever a websocket library
provides
with the expectation that that will also be rooted in TLS) when it
substitutes websockets as the layer under BFCP. The security
considerations section needs to make this much more obvious -
implementers and deployers need to be see this as a strong-primary
point to avoid anyone thinking all the thinking that went into
securing
BFCP as captured in draft-ietf-bfcpbis-rfc4582bis still applies.

There should be more discussion about what a BFCP implementation that
cares about the attacks discussed in section 14 of
draft-ietf-bfcpbis-rfc4582bis requires of its library. The current
document gets most of the way there, but there are things missing.
Shouldn't there be some discussion of ensuring the websocket library
used supports and will use the cipher suites called out in the core
BFCP document? If not, this document needs to be very explicit that
you
are only going to get the confidentiality protection the library
provides. The current consideration section calls out relying on "a
typical webserver-client model" and talks about server
authentication,
but not client authentication. Section 8 shows most of what you're
expecting the server to do to authenticate the client, but you need
more text about what you expect the client libraries to be doing to
let
the server do its job (and you should point back to that from the
security considerations section).

I strongly recommend simply walking through the cases again in the
security considerations section of this document, explaining how the
websocket library and the bfcp implementation are going to interact
to
mitigate the attacks. 

Nits/editorial comments: 

The 3rd paragraph of section 3 speaks generally about how the
websocket
protocol works - you call out it can carry text or binary data and
that
it supports split frames. But then you go on to constrain the use of
the protocol in this document to a particular bit of binary data and
constrain using the protocol to not split frames (and to only put one
BFCP message in each frame). This is confusing. I suggest deleting
the
second sentence of that paragraph and the indented call-out below it.
If the observation about the API callbacks is important, work it in 
where you talk about the one-messsage-per-frame restriction.

The last sentence of the second paragraph of section 5 relies on an
inference that you should make explicit. Instead of "is a server on
the
Internet", say "will have a globally routable address". 

The last paragraph of 6.1 is not logically sound - it falls apart at
"So". Please restructure it. As it stands, it says something like:
'Some soda manufacturers don't provide sugar-free variants of their
soda. Therefore, we recommend always drinking sugar-laden soda, but
we
allow drinking sugar-free.' What were you actually trying to say?




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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: Roman Shpount <roman@telurix.com>, Alan Ford <alan.ford@gmail.com>, "Tom Kristensen (tomkrist)" <tomkrist@cisco.com>, Tom Kristensen <2mkristensen@gmail.com>
Thread-Topic: [bfcpbis] [MMUSIC] m= line protocol in case of ICE
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Date: Tue, 10 Jan 2017 20:17:03 +0000
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--_000_E141AB908F354786B443DF7682F3D5FAciscocom_--


From nobody Fri Jan 13 10:05:20 2017
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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 Binary Floor Control Protocol Bis  of the IETF.

        Title           : Session Description Protocol (SDP) WebSocket Connection URI Attribute
        Authors         : Ram Mohan Ravindranath
                          Gonzalo Salgueiro
	Filename        : draft-ietf-bfcpbis-sdp-ws-uri-08.txt
	Pages           : 12
	Date            : 2017-01-13

Abstract:
   The WebSocket protocol enables bidirectional real-time communication
   between clients and servers in web-based applications.  This document
   specifies extensions to Session Description Protocol (SDP) for
   application protocols using WebSocket as a transport.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bfcpbis-sdp-ws-uri/

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https://tools.ietf.org/html/draft-ietf-bfcpbis-sdp-ws-uri-08

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bfcpbis-sdp-ws-uri-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.

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From nobody Fri Jan 13 14:19:26 2017
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Alexey Melnikov has entered the following ballot position for
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----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

This is generally a well written document, but I have a small list of
issues that I would like to discuss before recommending its approval:

1) Are a=ws-uri and a=wss-uri mutually exclusive? (Section 4.3 is a good
place to mention what to do if both are specified).

Why not a single attribute, considering that both ws: and wss: URIs are
possible?

2) In Section 6: how is Websocket TLS server identity verified?


----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Is S/MIME protection with SIP actually deployed?



From nobody Sun Jan 15 09:39:03 2017
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

- sec 4.2. The MUST here is inappropriate (given the split of docs):
„For example, to negotiate BFCP-over-WebSocket the "proto" value in the
   "m=" line MUST be TCP/WSS/BFCP if WebSocket is over TLS, else it
MUST
   be TCP/WS/BFCP.“
Should be instead:
„For example, to negotiate BFCP-over-WebSocket the "proto" value in the
   "m=" line is TCP/WSS/BFCP if WebSocket is over TLS, else it is
   TCP/WS/BFCP., as specified in [I-D.ietf-bfcpbis-bfcp-websocket]“
- Also remove the following sentence in section 4.3: 
„For BFCP application, the "proto" value in the "m=" line
   MUST be TCP/WSS/BFCP if WebSocket is run on TLS, else it MUST be
   TCP/WS/BFCP.“
- In section 6: „a=ws/a=wss-uri“. Maybe use „a=ws-uri/a=wss-uri“ instead?



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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Alexey Melnikov <aamelnikov@fastmail.fm>, The IESG <iesg@ietf.org>
Thread-Topic: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
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From: Alexey Melnikov <aamelnikov@fastmail.fm>
To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>, The IESG <iesg@ietf.org>
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Date: Mon, 16 Jan 2017 14:27:42 +0000
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Cc: draft-ietf-bfcpbis-sdp-ws-uri@ietf.org, bfcpbis@ietf.org, "Charles Eckel \(eckelcu\)" <eckelcu@cisco.com>, bfcpbis-chairs@ietf.org
Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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Hi Ram,

On Mon, Jan 16, 2017, at 06:09 AM, Ram Mohan R (rmohanr) wrote:
> Hi Alexey,
> 
> Thanks for your feedback. Please see inline <Ram>
> 
> -----Original Message-----
> From: bfcpbis <bfcpbis-bounces@ietf.org> on behalf of Alexey Melnikov
> <aamelnikov@fastmail.fm>
> Date: Saturday, 14 January 2017 at 3:49 AM
> To: The IESG <iesg@ietf.org>
> Cc: "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org"
> <draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org"
> <bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>,
> "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>
> Subject: [bfcpbis] Alexey Melnikov's Discuss on
> draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
> 
>     Alexey Melnikov has entered the following ballot position for
>     draft-ietf-bfcpbis-sdp-ws-uri-08: Discuss
>     

>     ----------------------------------------------------------------------
>     DISCUSS:
>     ----------------------------------------------------------------------
>     
>     This is generally a well written document, but I have a small list of
>     issues that I would like to discuss before recommending its approval:
>     
>     1) Are a=ws-uri and a=wss-uri mutually exclusive? (Section 4.3 is a
>     good
>     place to mention what to do if both are specified).
> 
> <Ram> Yes kind of. In a given media line (m= line) we will either have
> a=ws-uri or a=wss-uri. That said a response from a BFCP server using
> webSocket as a transport can
> have two media lines one with ws and other with wss. Something like:
> 
> Answer (server):
>    m=application 50000 TCP/WSS/BFCP *
>    a=setup:passive
>    a=connection:new
>    a=wss-uri:wss://bfcp-ws.example.com?token=3170449312
>    m=application 50000 TCP/WS/BFCP *
>    a=setup:passive
>    a=connection:new
>    a=ws-uri:ws://bfcp-ws.example.com?token=3170449312

[Alexey]: This is exactly my problem, you should specify how a recipient
should handle your example above. If you only have 1 attribute, the
problem goes away entirely.

>     Why not a single attribute, considering that both ws: and wss: URIs
>     are
>     possible?
> 
> <Ram> I would still prefer two attributes. We just followed the
> convention / approach that was used in [RFC6455].  


From nobody Mon Jan 16 06:49:09 2017
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Alexey Melnikov <aamelnikov@fastmail.fm>, The IESG <iesg@ietf.org>
Thread-Topic: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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From: Alexey Melnikov <aamelnikov@fastmail.fm>
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Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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Hi Ram,

On Mon, Jan 16, 2017, at 02:49 PM, Ram Mohan R (rmohanr) wrote:
> Hi Alexey,
>=20
> Please see inline <Ram>
>=20
> -----Original Message-----
> From: Alexey Melnikov <aamelnikov@fastmail.fm>
> Date: Monday, 16 January 2017 at 7:57 PM
> To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>, The IESG <iesg@ietf.org>
> Cc: "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org"
> <draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org"
> <bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>,
> "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>
> Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on
> draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
>=20
>     Hi Ram,
>=20=20=20=20=20
>     On Mon, Jan 16, 2017, at 06:09 AM, Ram Mohan R (rmohanr) wrote:
>     > Hi Alexey,
>     >=20
>     > Thanks for your feedback. Please see inline <Ram>
>     >=20
>     > -----Original Message-----
>     > From: bfcpbis <bfcpbis-bounces@ietf.org> on behalf of Alexey Melnik=
ov
>     > <aamelnikov@fastmail.fm>
>     > Date: Saturday, 14 January 2017 at 3:49 AM
>     > To: The IESG <iesg@ietf.org>
>     > Cc: "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org"
>     > <draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org"
>     > <bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>,
>     > "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>
>     > Subject: [bfcpbis] Alexey Melnikov's Discuss on
>     > draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
>     >=20
>     >     Alexey Melnikov has entered the following ballot position for
>     >     draft-ietf-bfcpbis-sdp-ws-uri-08: Discuss
>     >=20=20=20=20=20
>=20=20=20=20=20
>     >     ---------------------------------------------------------------=
-------
>     >     DISCUSS:
>     >     ---------------------------------------------------------------=
-------
>     >=20=20=20=20=20
>     >     This is generally a well written document, but I have a small l=
ist of
>     >     issues that I would like to discuss before recommending its app=
roval:
>     >=20=20=20=20=20
>     >     1) Are a=3Dws-uri and a=3Dwss-uri mutually exclusive? (Section =
4.3 is a
>     >     good
>     >     place to mention what to do if both are specified).
>     >=20
>     > <Ram> Yes kind of. In a given media line (m=3D line) we will either=
 have
>     > a=3Dws-uri or a=3Dwss-uri. That said a response from a BFCP server =
using
>     > webSocket as a transport can
>     > have two media lines one with ws and other with wss. Something like:
>     >=20
>     > Answer (server):
>     >    m=3Dapplication 50000 TCP/WSS/BFCP *
>     >    a=3Dsetup:passive
>     >    a=3Dconnection:new
>     >    a=3Dwss-uri:wss://bfcp-ws.example.com?token=3D3170449312
>     >    m=3Dapplication 50000 TCP/WS/BFCP *
>     >    a=3Dsetup:passive
>     >    a=3Dconnection:new
>     >    a=3Dws-uri:ws://bfcp-ws.example.com?token=3D3170449312
>=20=20=20=20=20
>     [Alexey]: This is exactly my problem, you should specify how a
>     recipient
>     should handle your example above. If you only have 1 attribute, the
>     problem goes away entirely.
>=20
> <Ram> in the above case, they are still two different m=3D lines. The
> receiver (after offer/answer is done) of this SDP connects to the URI
> mentioned in that m=3D line.=20
> Note I just re-used the same URL/port in the example above. If there are
> multiple m=3Dapplication media lines (they will be for different
> applications) being negotiated in SDP, one application may use secure WS
> and other application may use non-secure WS. The client after it receives
> the answer SDP will just setup the connection to the URI specified in the
> attribute.=20=20

Sorry, I was thinking about different example:

m=3Dapplication 50000 TCP/WSS/BFCP *
   a=3Dsetup:passive
   a=3Dconnection:new
   a=3Dwss-uri:wss://bfcp-ws.example.com?token=3D3170449312
   a=3Dws-uri:ws://bfcp-ws.example.com?token=3D3170449312

You have 2 conflicting URIs for the same m=3D line. Is this possible?

> I don=E2=80=99t see any problem in here.=20=20
>=20
> Regards,
> Ram
>=20
>     >     Why not a single attribute, considering that both ws: and wss: =
URIs
>     >     are
>     >     possible?
>     >=20
>     > <Ram> I would still prefer two attributes. We just followed the
>     > convention / approach that was used in [RFC6455].=20=20
>=20=20=20=20=20
>=20


From nobody Mon Jan 16 07:09:34 2017
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Alexey Melnikov <aamelnikov@fastmail.fm>, The IESG <iesg@ietf.org>
Thread-Topic: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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From nobody Mon Jan 16 17:04:57 2017
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Subject: [bfcpbis] Spencer Dawkins' No Objection on draft-ietf-bfcpbis-sdp-ws-uri-08: (with COMMENT)
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

This document was very clear for me. Thank you for that.



From nobody Tue Jan 17 06:21:50 2017
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

1) I find this sentence slightly confusing:  „This document specifies a new WebSocket sub-
   protocol as a reliable transport mechanism between Binary Floor
   Control Protocol (BFCP) entities to enable usage of BFCP in new
   scenarios.“ because it suggests that this document specifies a new protocol which is
not true. How about the following instead:
„This document specifies the use of Binary Floor
   Control Protocol (BFCP) as a new WebSocket sub-
   protocol enabling a reliable transport mechanism between     BFCP entities in new scenarios.“
If this change is used, please also check similar wording in the rest of
the doc.
2) In section 4.1: 
„The WebSocket messages transmitted over this connection MUST conform
to
   the negotiated WebSocket sub-protocol.“ Not sure if this is actually meaningful given the subsequent MUSTs in the
next section. I guess this sentence could simply be removed… Also would
this mean that it is the task of the BFCP WS sub protocol to verify that
BFCP messages are valid?
3) In section 5: „Each BFCP message MUST be carried within a single
WebSocket message,
   and a WebSocket message MUST NOT contain more than one BFCP message.“ This seem to be long rather in section 4.2 than in 5.
4) The following sentence in section 6.2 is basically copied and pasted
from ietf-bfcpbis-sdp-ws-uri. It’s usually not a good idea to duplicate
normative text (as problems when updating might occur). I’d recommend to
either a) remove this text (and only refer to ietf-bfcpbis-sdp-ws-uri),
or b) use quotes to make clear that this is a citation, or c) rephrase in
non-normative language (with a clear indication that the normative text
can be found in ietf-bfcpbis-sdp-ws-uri). „When the 'ws-uri' or 'wss-uri' attribute is present in the
   media section of the SDP, the IP and port information provided in
the
   'c' lines SHALL be ignored and the full URI SHALL be used instead to
   open the WebSocket connection. “



From nobody Tue Jan 17 06:37:29 2017
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To: Alexey Melnikov <aamelnikov@fastmail.fm>
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Cc: "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org" <draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "Ram Mohan R \(rmohanr\)" <rmohanr@cisco.com>, "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>, "Charles Eckel \(eckelcu\)" <eckelcu@cisco.com>, The IESG <iesg@ietf.org>
Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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Alexey, would the following changes clarify things?

Section 4.1
OLD
the server side, which could be either
   the offerer or answerer, MUST add an "a=3Dws-uri" or "a=3Dwss-uri"
   attribute in the media section
NEW
the server side, which could be either
   the offerer or answerer, MUST add an "a=3Dws-uri" or "a=3Dwss-uri=E2=80=
=9D
   attribute (but not both) in the media section

Section 4.3
OLD
If the answers assigns SDP "setup" attribute with "passive", then it
   MUST have a URI in either "a=3Dws-uri" or "a=3Dwss-uri" attribute
   depending on whether the application uses WebSocket or
   secureWebSocket.
NEW
If the answers assigns SDP "setup" attribute with "passive", then it
   MUST have a URI in either "a=3Dws-uri" or "a=3Dwss-uri" attribute
   (but not both) in the media section, depending on whether the =
application uses WebSocket or
   secureWebSocket.

Ram, would you be okay with those clarifications?

Alissa


> On Jan 16, 2017, at 10:09 AM, Ram Mohan R (rmohanr) =
<rmohanr@cisco.com> wrote:
>=20
> Hi Alexey,
>=20
> -----Original Message-----
> From: Alexey Melnikov <aamelnikov@fastmail.fm>
> Date: Monday, 16 January 2017 at 8:25 PM
> To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>, The IESG =
<iesg@ietf.org>
> Cc: "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org" =
<draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org" =
<bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, =
"bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>
> Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on =
draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
>=20
>    Hi Ram,
>=20
>    On Mon, Jan 16, 2017, at 02:49 PM, Ram Mohan R (rmohanr) wrote:
>> Hi Alexey,
>>=20
>> Please see inline <Ram>
>>=20
>> -----Original Message-----
>> From: Alexey Melnikov <aamelnikov@fastmail.fm>
>> Date: Monday, 16 January 2017 at 7:57 PM
>> To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>, The IESG =
<iesg@ietf.org>
>> Cc: "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org"
>> <draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org"
>> <bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>,
>> "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>
>> Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on
>> draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
>>=20
>>    Hi Ram,
>>=20
>>    On Mon, Jan 16, 2017, at 06:09 AM, Ram Mohan R (rmohanr) wrote:
>>> Hi Alexey,
>>>=20
>>> Thanks for your feedback. Please see inline <Ram>
>>>=20
>>> -----Original Message-----
>>> From: bfcpbis <bfcpbis-bounces@ietf.org> on behalf of Alexey =
Melnikov
>>> <aamelnikov@fastmail.fm>
>>> Date: Saturday, 14 January 2017 at 3:49 AM
>>> To: The IESG <iesg@ietf.org>
>>> Cc: "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org"
>>> <draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org"
>>> <bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>,
>>> "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>
>>> Subject: [bfcpbis] Alexey Melnikov's Discuss on
>>> draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
>>>=20
>>>    Alexey Melnikov has entered the following ballot position for
>>>    draft-ietf-bfcpbis-sdp-ws-uri-08: Discuss
>>>=20
>>=20
>>>    =
----------------------------------------------------------------------
>>>    DISCUSS:
>>>    =
----------------------------------------------------------------------
>>>=20
>>>    This is generally a well written document, but I have a small =
list of
>>>    issues that I would like to discuss before recommending its =
approval:
>>>=20
>>>    1) Are a=3Dws-uri and a=3Dwss-uri mutually exclusive? (Section =
4.3 is a
>>>    good
>>>    place to mention what to do if both are specified).
>>>=20
>>> <Ram> Yes kind of. In a given media line (m=3D line) we will either =
have
>>> a=3Dws-uri or a=3Dwss-uri. That said a response from a BFCP server =
using
>>> webSocket as a transport can
>>> have two media lines one with ws and other with wss. Something like:
>>>=20
>>> Answer (server):
>>>   m=3Dapplication 50000 TCP/WSS/BFCP *
>>>   a=3Dsetup:passive
>>>   a=3Dconnection:new
>>>   a=3Dwss-uri:wss://bfcp-ws.example.com?token=3D3170449312
>>>   m=3Dapplication 50000 TCP/WS/BFCP *
>>>   a=3Dsetup:passive
>>>   a=3Dconnection:new
>>>   a=3Dws-uri:ws://bfcp-ws.example.com?token=3D3170449312
>>=20
>>    [Alexey]: This is exactly my problem, you should specify how a
>>    recipient
>>    should handle your example above. If you only have 1 attribute, =
the
>>    problem goes away entirely.
>>=20
>> <Ram> in the above case, they are still two different m=3D lines. The
>> receiver (after offer/answer is done) of this SDP connects to the URI
>> mentioned in that m=3D line.=20
>> Note I just re-used the same URL/port in the example above. If there =
are
>> multiple m=3Dapplication media lines (they will be for different
>> applications) being negotiated in SDP, one application may use secure =
WS
>> and other application may use non-secure WS. The client after it =
receives
>> the answer SDP will just setup the connection to the URI specified in =
the
>> attribute. =20
>=20
>    Sorry, I was thinking about different example:
>=20
>    m=3Dapplication 50000 TCP/WSS/BFCP *
>       a=3Dsetup:passive
>       a=3Dconnection:new
>       a=3Dwss-uri:wss://bfcp-ws.example.com?token=3D3170449312
>       a=3Dws-uri:ws://bfcp-ws.example.com?token=3D3170449312
>=20
>    You have 2 conflicting URIs for the same m=3D line. Is this =
possible?
>=20
> <Ram> No this is not possible. If the transport is TCP/WSS/BFCP we =
should have only a=3Dwss-uri. If transport is TCP/WS/BFCP we should have =
only a=3Dws-uri.
>=20
> Regards,
>  Ram
>=20
>> I don=E2=80=99t see any problem in here. =20
>>=20
>> Regards,
>> Ram
>>=20
>>>    Why not a single attribute, considering that both ws: and wss: =
URIs
>>>    are
>>>    possible?
>>>=20
>>> <Ram> I would still prefer two attributes. We just followed the
>>> convention / approach that was used in [RFC6455]. =20
>>=20
>>=20
>=20
>=20


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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Alissa Cooper <alissa@cooperw.in>, Alexey Melnikov <aamelnikov@fastmail.fm>
Thread-Topic: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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Date: Tue, 17 Jan 2017 14:40:42 +0000
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Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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DQo=


From nobody Tue Jan 17 07:21:34 2017
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Subject: Re: [bfcpbis] Review of draft-ietf-bfcpbis-bfcp-websocket-13
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On 1/15/17 11:36 PM, Ram Mohan R (rmohanr) wrote:
> Hi Robert,
>
> Thanks for your review. Please see inline <Ram>
>
>> -----Original Message-----
>> From: Robert Sparks <rjsparks@nostrum.com>
>> Date: Thursday, 5 January 2017 at 4:05 AM
>> To: "gen-art@ietf.org" <gen-art@ietf.org>
>> Cc: "draft-ietf-bfcpbis-bfcp-websocket.all@ietf.org" <draft-ietf-bfcpbis-bfcp-websocket.all@ietf.org>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>, "ietf@ietf.org" ><ietf@ietf.org>
>> Subject: Review of draft-ietf-bfcpbis-bfcp-websocket-13
>> Resent-From: <alias-bounces@ietf.org>
>> Resent-To: <anton.roman@quobis.com>, <stephane.cazeaux@orange.com>, <gsalguei@cisco.com>, <sergio.garcia.murillo@gmail.com>, <rmohanr@cisco.com>, ><victor.pascual.avila@oracle.com>, <keith.drage@alcatel-lucent.com>, <eckelcu@cisco.com>, <ben@nostrum.com>, <alissa@cooperw.in>, ><aamelnikov@fastmail.fm>, Charles Eckel <eckelcu@cisco.com>
>> Resent-Date: Thursday, 5 January 2017 at 4:05 AM
>    >  Reviewer: Robert Sparks
>     > Review result: Ready with Issues
>      
>     > I am the assigned Gen-ART reviewer for this draft. The General Area
>     > Review Team (Gen-ART) reviews all IETF documents being processed
>     > by the IESG for the IETF Chair.  Please treat these comments just
>      > like any other last call comments.
>      
>      > For more information, please see the FAQ at
>      > <https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.
>      >
>      > Document: draft-ietf-bfcpbis-bfcp-websocket13-
>      > Reviewer: Robert Sparks
>      > Review Date: 2017-01-04
>      > IETF LC End Date: 2017-01-11
>      > IESG Telechat date: 2017-01-19
>      >
>      > Summary: Basically ready but with issues that need to be addressed
>      > before publication as a Proposed Standard
>      >
>      > Issues:
>      >
>      > The BFCP spec (at draft-ietf-bfcpbis-rfc4582bis) relies heavily on
>      > recommendations it makes about the use of TLS or DTLS, and even goes
>      > to
>      > the point of specifyig a particular set of cipher suites to use wih
>      > those protocols when using them with BFCP. The security
>      > considerations
>      > section of that document details some specific attacks and how the
>      > use
>      > of TLS/DTLS mitigates them (providing some justification for the
>      > cipher
>      > suites that the document specifies).
>      >
>      > This document provides a _COMPLETELY DIFFERENT_ security mechanism
>      > (essentially punting entirely to whatever a websocket library
>      > provides
>     > with the expectation that that will also be rooted in TLS) when it
>     > substitutes websockets as the layer under BFCP. The security
>     > considerations section needs to make this much more obvious -
>     > implementers and deployers need to be see this as a strong-primary
>     > point to avoid anyone thinking all the thinking that went into
>      > securing
>   >   BFCP as captured in draft-ietf-bfcpbis-rfc4582bis still applies.
>
> <Ram> I will add the below line in security consideration section. Is this sufficient?
>
> NEW:
> “The security considerations described in draft-ietf-bfcpbis-rfc4582bis are applicable here as well.”
Well, no. That misses the point entirely.

>      
>    >  There should be more discussion about what a BFCP implementation that
>     > cares about the attacks discussed in section 14 of
>     > draft-ietf-bfcpbis-rfc4582bis requires of its library. The current
>     > document gets most of the way there, but there are things missing.
>      >Shouldn't there be some discussion of ensuring the websocket library
>     > used supports and will use the cipher suites called out in the core
>     > BFCP document? If not, this document needs to be very explicit that
>      > you
>      > are only going to get the confidentiality protection the library
>      > provides.
>
> <Ram> Good point. I would prefer to add a text something to the effect of:
>
> “The security considerations mentioned in section 14 of [draft-ietf-bfcpbis-rfc4582bis] are applicable here. In order to mitigate
> the attacks mentioned in section 14 of [draft-ietf-bfcpbis-rfc4582bis], it is RECOMMENDED that the clients and server use secure WebSocket
> with an encryption algorithm according to Section 7 of [draft-ietf-bfcpbis-rfc4582bis]”
Do websocket libraries give the application that kind of control?
>
>> The current consideration section calls out relying on "a
>   >   typical webserver-client model" and talks about server
>    >   authentication,
>     > but not client authentication. Section 8 shows most of what you're
>     > expecting the server to do to authenticate the client, but you need
>     > more text about what you expect the client libraries to be doing to
>     > let
>     > the server do its job (and you should point back to that from the
>     > security considerations section).
>
> <Ram> section 8 second para has text on what client should do. Also 4th para has some text.  Is there anything else you would like to see in that?
Yes - you're still looking at the text that describes how the client 
authenticates the server.
I was asking for more text talking about what the client needs to do to 
allow the server to authenticate the client.
I'm rereading the 5th paragraph now and maybe you're saying all you can.

>   I will add a line in security considerations
>
> EXISTING:
> The security model here is a typical webserver-
>     client model where the client validates the server certificate and
>     then connects to the server
>
> NEW:
> The security model here is a typical webserver-
>     client model where the client validates the server certificate and
>     then connects to the server. Section 8 describes the authentication procedures between client and server.
>      
>     > I strongly recommend simply walking through the cases again in the
>     > security considerations section of this document, explaining how the
>     > websocket library and the bfcp implementation are going to interact
>     > to
>     > mitigate the attacks.
>     >
>     > Nits/editorial comments:
>     >
>     > The 3rd paragraph of section 3 speaks generally about how the
>     > websocket
>     > protocol works - you call out it can carry text or binary data and
>     > that
>     > it supports split frames. But then you go on to constrain the use of
>     > the protocol in this document to a particular bit of binary data and
>     > constrain using the protocol to not split frames (and to only put one
>     > BFCP message in each frame). This is confusing. I suggest deleting
>     > the
>     > second sentence of that paragraph and the indented call-out below it.
>     > If the observation about the API callbacks is important, work it in
>     > where you talk about the one-messsage-per-frame restriction.
>
> <Ram>  I am ok to delete the second line and the indented call-out.
>
>    >
>    > The last sentence of the second paragraph of section 5 relies on an
>    > inference that you should make explicit. Instead of "is a server on
>    > the
>    > Internet", say "will have a globally routable address".
>
> <Ram> Ok will fix it.
>
>    >
>    > The last paragraph of 6.1 is not logically sound - it falls apart at
>    > "So". Please restructure it. As it stands, it says something like:
>    >   'Some soda manufacturers don't provide sugar-free variants of their
>    > soda. Therefore, we recommend always drinking sugar-laden soda, but
>    >  we
>    >  allow drinking sugar-free.' What were you actually trying to say?
>
> How about changing to this?
>
> EXISTING:
> Some web browsers do not allow non-secure WebSocket connections to be
>     made.  So, while this document recommends the use of Secure
>     WebSockets (i.e.TCP/WSS) for security reasons, TCP/WS is also
>     permitted so as to achieve maximum compatibility among clients.
>
> NEW:
> While this document recommends the use of Secure
>     WebSockets (i.e.TCP/WSS) for security reasons, TCP/WS is also
>     permitted so as to achieve maximum compatibility among clients.
That's much clearer
>
> Regards,
> Ram
>      
>      
>      
>      
>
>


From nobody Tue Jan 17 07:47:21 2017
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Subject: [bfcpbis] Spencer Dawkins' Yes on draft-ietf-bfcpbis-bfcp-websocket-13: (with COMMENT)
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Spencer Dawkins has entered the following ballot position for
draft-ietf-bfcpbis-bfcp-websocket-13: Yes

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I have a couple of questions on authentication in this draft.

Does this text,

      Since the WebSocket API does not distinguish between certificate
      errors and other kinds of failure to establish a connection, it
is
      expected that browser vendors will warn end users directly of any
      kind of problem with the server certificate.

apply to any WebSocket-based application?

In this text,

   A floor control server that receives a message over TCP/WS can
   request the use of TCP/WSS by generating an Error message, as
   described in Section 13.8 of [I-D.ietf-bfcpbis-rfc4582bis], with an
   Error code with a value of 9 (use TLS).

is "request" the right word? Or is "require" more accurate, if the server
isn't going to establish a TCP/WS connection?



From nobody Tue Jan 17 08:34:53 2017
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Subject: [bfcpbis] Alexey Melnikov's No Objection on draft-ietf-bfcpbis-bfcp-websocket-13: (with COMMENT)
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Alexey Melnikov has entered the following ballot position for
draft-ietf-bfcpbis-bfcp-websocket-13: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------


In 4.2, last sentence: wouldn't that require a new WebSocket sub-protocol
identifier?

In 6.2: some formatting errors in the PDF version. Also, I think you
meant Section 3.3 (not 3.2) when talking about WSS.

In 7.2: when referencing Section 3, you are missing the RFC number. At
least section 3 of this draft is not relevant.

In 8: HTTP authentication text is rather weak.



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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 Binary Floor Control Protocol Bis  of the IETF.

        Title           : The WebSocket Protocol as a Transport for the Binary Floor Control Protocol (BFCP)
        Authors         : Victor Pascual
                          Antón Román
                          Stéphane Cazeaux
                          Gonzalo Salgueiro
                          Ram Mohan Ravindranath
                          Sergio Garcia Murillo
	Filename        : draft-ietf-bfcpbis-bfcp-websocket-14.txt
	Pages           : 13
	Date            : 2017-01-17

Abstract:
   The WebSocket protocol enables two-way realtime communication between
   clients and servers.  This document specifies the use of Binary Floor
   Control Protocol(BFCP) as a new WebSocket sub-protocol enabling a
   reliable transport mechanism between BFCP entities in new scenarios.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bfcpbis-bfcp-websocket/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-bfcpbis-bfcp-websocket-14

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bfcpbis-bfcp-websocket-14


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 Wed Jan 18 11:40:15 2017
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Subject: [bfcpbis] Kathleen Moriarty's No Objection on draft-ietf-bfcpbis-bfcp-websocket-14: (with COMMENT)
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I agree with Alexey's comment on section 8.  If fallback to HTTP
authentication happens, the implementer should be aware of the weaknesses
in HTTP basic [RFC7617] and digest [RFC7616] spelled out in the
respective security considerations sections.  The HTTPAuth WG put out a
few experimental RFCs with methods to eliminate some of the weaknesses,
like HOBA [RFC7486] that gets rid of the need for passwords.  Adding this
detail would be helpful.



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Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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Hi Ram,

I had some further conversation with Alexey on the side and wanted to =
come back to a question he posed: is there a reason why a=3Dws-uri and =
a=3Dwss-uri both need to be specified? Why can=E2=80=99t a single label =
be specified, say a=3Dwebsocket-uri, and then have normative language =
requiring the scheme in the URI itself to match what=E2=80=99s in the =
associated m-line (ws:// for TCP/WS/BFCP and wss:// for TCP/WSS/BFCP)? =
Won=E2=80=99t it be more efficient for implementations to grab the URI =
itself anyway and check that the scheme matches the m-line?

Thanks,
Alissa

> On Jan 17, 2017, at 9:40 AM, Ram Mohan R (rmohanr) <rmohanr@cisco.com> =
wrote:
>=20
> Alissa,
>=20
> I am fine with the proposed text.
>=20
> Thanks,
> Ram
>=20
> -----Original Message-----
> From: Alissa Cooper <alissa@cooperw.in>
> Date: Tuesday, 17 January 2017 at 8:07 PM
> To: Alexey Melnikov <aamelnikov@fastmail.fm>
> Cc: The IESG <iesg@ietf.org>, "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org" =
<draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org" =
<bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, =
"bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>, "Ram Mohan R =
(rmohanr)" <rmohanr@cisco.com>
> Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on =
draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
>=20
>    Alexey, would the following changes clarify things?
>=20
>    Section 4.1
>    OLD
>    the server side, which could be either
>       the offerer or answerer, MUST add an "a=3Dws-uri" or "a=3Dwss-uri"=

>       attribute in the media section
>    NEW
>    the server side, which could be either
>       the offerer or answerer, MUST add an "a=3Dws-uri" or =
"a=3Dwss-uri=E2=80=9D
>       attribute (but not both) in the media section
>=20
>    Section 4.3
>    OLD
>    If the answers assigns SDP "setup" attribute with "passive", then =
it
>       MUST have a URI in either "a=3Dws-uri" or "a=3Dwss-uri" =
attribute
>       depending on whether the application uses WebSocket or
>       secureWebSocket.
>    NEW
>    If the answers assigns SDP "setup" attribute with "passive", then =
it
>       MUST have a URI in either "a=3Dws-uri" or "a=3Dwss-uri" =
attribute
>       (but not both) in the media section, depending on whether the =
application uses WebSocket or
>       secureWebSocket.
>=20
>    Ram, would you be okay with those clarifications?
>=20
>    Alissa
>=20
>=20
>> On Jan 16, 2017, at 10:09 AM, Ram Mohan R (rmohanr) =
<rmohanr@cisco.com> wrote:
>>=20
>> Hi Alexey,
>>=20
>> -----Original Message-----
>> From: Alexey Melnikov <aamelnikov@fastmail.fm>
>> Date: Monday, 16 January 2017 at 8:25 PM
>> To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>, The IESG =
<iesg@ietf.org>
>> Cc: "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org" =
<draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org" =
<bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, =
"bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>
>> Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on =
draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
>>=20
>>   Hi Ram,
>>=20
>>   On Mon, Jan 16, 2017, at 02:49 PM, Ram Mohan R (rmohanr) wrote:
>>> Hi Alexey,
>>>=20
>>> Please see inline <Ram>
>>>=20
>>> -----Original Message-----
>>> From: Alexey Melnikov <aamelnikov@fastmail.fm>
>>> Date: Monday, 16 January 2017 at 7:57 PM
>>> To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>, The IESG =
<iesg@ietf.org>
>>> Cc: "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org"
>>> <draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org"
>>> <bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>,
>>> "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>
>>> Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on
>>> draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
>>>=20
>>>   Hi Ram,
>>>=20
>>>   On Mon, Jan 16, 2017, at 06:09 AM, Ram Mohan R (rmohanr) wrote:
>>>> Hi Alexey,
>>>>=20
>>>> Thanks for your feedback. Please see inline <Ram>
>>>>=20
>>>> -----Original Message-----
>>>> From: bfcpbis <bfcpbis-bounces@ietf.org> on behalf of Alexey =
Melnikov
>>>> <aamelnikov@fastmail.fm>
>>>> Date: Saturday, 14 January 2017 at 3:49 AM
>>>> To: The IESG <iesg@ietf.org>
>>>> Cc: "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org"
>>>> <draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org"
>>>> <bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>,
>>>> "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>
>>>> Subject: [bfcpbis] Alexey Melnikov's Discuss on
>>>> draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
>>>>=20
>>>>   Alexey Melnikov has entered the following ballot position for
>>>>   draft-ietf-bfcpbis-sdp-ws-uri-08: Discuss
>>>>=20
>>>=20
>>>>   =
----------------------------------------------------------------------
>>>>   DISCUSS:
>>>>   =
----------------------------------------------------------------------
>>>>=20
>>>>   This is generally a well written document, but I have a small =
list of
>>>>   issues that I would like to discuss before recommending its =
approval:
>>>>=20
>>>>   1) Are a=3Dws-uri and a=3Dwss-uri mutually exclusive? (Section =
4.3 is a
>>>>   good
>>>>   place to mention what to do if both are specified).
>>>>=20
>>>> <Ram> Yes kind of. In a given media line (m=3D line) we will either =
have
>>>> a=3Dws-uri or a=3Dwss-uri. That said a response from a BFCP server =
using
>>>> webSocket as a transport can
>>>> have two media lines one with ws and other with wss. Something =
like:
>>>>=20
>>>> Answer (server):
>>>>  m=3Dapplication 50000 TCP/WSS/BFCP *
>>>>  a=3Dsetup:passive
>>>>  a=3Dconnection:new
>>>>  a=3Dwss-uri:wss://bfcp-ws.example.com?token=3D3170449312
>>>>  m=3Dapplication 50000 TCP/WS/BFCP *
>>>>  a=3Dsetup:passive
>>>>  a=3Dconnection:new
>>>>  a=3Dws-uri:ws://bfcp-ws.example.com?token=3D3170449312
>>>=20
>>>   [Alexey]: This is exactly my problem, you should specify how a
>>>   recipient
>>>   should handle your example above. If you only have 1 attribute, =
the
>>>   problem goes away entirely.
>>>=20
>>> <Ram> in the above case, they are still two different m=3D lines. =
The
>>> receiver (after offer/answer is done) of this SDP connects to the =
URI
>>> mentioned in that m=3D line.=20
>>> Note I just re-used the same URL/port in the example above. If there =
are
>>> multiple m=3Dapplication media lines (they will be for different
>>> applications) being negotiated in SDP, one application may use =
secure WS
>>> and other application may use non-secure WS. The client after it =
receives
>>> the answer SDP will just setup the connection to the URI specified =
in the
>>> attribute. =20
>>=20
>>   Sorry, I was thinking about different example:
>>=20
>>   m=3Dapplication 50000 TCP/WSS/BFCP *
>>      a=3Dsetup:passive
>>      a=3Dconnection:new
>>      a=3Dwss-uri:wss://bfcp-ws.example.com?token=3D3170449312
>>      a=3Dws-uri:ws://bfcp-ws.example.com?token=3D3170449312
>>=20
>>   You have 2 conflicting URIs for the same m=3D line. Is this =
possible?
>>=20
>> <Ram> No this is not possible. If the transport is TCP/WSS/BFCP we =
should have only a=3Dwss-uri. If transport is TCP/WS/BFCP we should have =
only a=3Dws-uri.
>>=20
>> Regards,
>> Ram
>>=20
>>> I don=E2=80=99t see any problem in here. =20
>>>=20
>>> Regards,
>>> Ram
>>>=20
>>>>   Why not a single attribute, considering that both ws: and wss: =
URIs
>>>>   are
>>>>   possible?
>>>>=20
>>>> <Ram> I would still prefer two attributes. We just followed the
>>>> convention / approach that was used in [RFC6455]. =20
>>>=20
>>>=20
>>=20
>>=20
>=20
>=20
>=20


From nobody Wed Jan 18 12:46:30 2017
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COMMENT:
----------------------------------------------------------------------

I may have missed it, but don't see a clear reason (would expect to see
it in the security considerations section) as to why TLS isn't a MUST. 
RECOMMENDED is good, but having a reason to justify this would be
helpful.  It seems like it is for legacy support of HTTP applications,
but spelling that out might be helpful.



From nobody Wed Jan 18 13:50:09 2017
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

There is ongoing discussion based on the security considerations
questions from Robert Sparks in his Gen-ART review. That discussion is
not yet finished, but needs to finish before we can approve this
document.



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Joel, Ram =97 thanks for the review and fixes!

Jari


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From nobody Wed Jan 18 15:40:57 2017
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----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

I plan to ballot "yes" for this document, but I have some concerns about
the security properties that I think need to be resolved first. I have
followed the discussion resulting from Robert's Gen-ART review (and will
have comments about that in the "COMMENTS section", but I think I see an
additional issue that hasn't been covered in that discussion.

draft-ietf-bfcpbis-rfc4582bis (currently in the RFC Editors queue)
defines some situations where TLS and client authentication are
normatively required. Specifically, section 9 of that draft says that, if
the signaling channel is authenticated and has confidentiality and
integrity protection, the BFCP client MUST be authenticated. Section 14
additionally says that under those circumstances, BFCP is REQUIRED to use
the mandated cryptographic algorithm. But bfcp-websocket only says that
WSS and client authentication are RECOMMENDED.

I think this could be fixed by requiring WSS, and the web-based client
authentication techniques described in this draft whenever the signaling
protocol is secured. The simplest way to describe that might be to say
that BFCP-websocket must use at least as strong protections as the
signaling channel.


----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I appreciate the author's efforts in resolving the security
considerations issues from Robert's Gen-ART review, but I don't think the
current text is quite there yet. Version 14 added the text to say that,
when using websockets, the websocket security mechanisms are used instead
of those from draft-ietf-bfcpbis-rfc4582bis. But Robert also asked for
the draft to describe how that change impacts the security analysis in
draft-ietf-bfcpbis-rfc4582bis. I don't see text that does that. I'd like
to see, for each of the attacks described in
draft-ietf-bfcpbis-rfc4582bis, text that says describes how (or if) a
similar attack would be mitigated using websocket.

-4.2, first paragraph: You talk about how the payload size limit is
smaller when using websocket. Can you give guidance for actual reasonable
limits?

-5, 2nd paragraph: "The BFCP server is a will have a globally routable
address"
Is there an implied MUST hiding in there? Also, there's a typo around "is
will have".

-8, paragraph 8: Is the point that you SHOULD authenticate the client, or
that if you want to authenticate the client you SHOULD do it this way? I
suspect the former is intended, but the text implies the latter.



From nobody Wed Jan 18 19:07:16 2017
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

How does this interact with websocket sub-protocol specifications? Is
there an expectation one might take some existing media protocol and use
it with this draft _without_ a sub-protocol spec? I note the examples use
bfcp, which in fact has a sub-protocol spec on this same telechat. (Most
of my detailed comments are related to this)

- 4.2, first paragraph: Am I correct that the "proto" field would also
include the sub-protocol? (e.g. TCP/WSS/BFCP)? Would you ever have a
"proto" filed value of just "TCP/WS(S)?

- 4.2, 2nd paragraph
I wonder if the guidance here (the recommendation that the offerer is the
active party) doesn't vary by sub-protocol? Or if it doesn't, if it's
more a matter of topology (e.g. servers with global IP addresses vs
clients behind NATs) than a matter of who sends the offer?
Also, please consider citing 4145 in this paragraph. (You do in 4.3).



From nobody Wed Jan 18 19:38:10 2017
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Robert Sparks <rjsparks@nostrum.com>, "gen-art@ietf.org" <gen-art@ietf.org>
Thread-Topic: Review of draft-ietf-bfcpbis-bfcp-websocket-13
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Date: Thu, 19 Jan 2017 03:37:59 +0000
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Subject: Re: [bfcpbis] Review of draft-ietf-bfcpbis-bfcp-websocket-13
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Alissa Cooper <alissa@cooperw.in>
Thread-Topic: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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Date: Thu, 19 Jan 2017 04:00:11 +0000
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References: <148434596441.9752.6696571117558965561.idtracker@ietfa.amsl.com> <CC88E0DB-1B9A-4565-BC9B-724ADFC94B75@cisco.com> <1484576862.2842665.849203352.4F87F4EA@webmail.messagingengine.com> <30CC3092-0ED4-4983-8203-8394FD06D0A9@cisco.com> <1484578527.2848348.849241320.7317C68A@webmail.messagingengine.com> <BAA69D79-2948-4953-A076-2B4917D1DDEB@cisco.com> <3E8813A2-FC3D-433F-B51B-41380ABD3D95@cooperw.in> <60D33439-D03C-4E3D-A293-9DE608AC5DB4@cisco.com> <6E698BCA-2F14-4660-B053-BEDA42860B86@cooperw.in>
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Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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Subject: [bfcpbis] Stephen Farrell's No Objection on draft-ietf-bfcpbis-bfcp-websocket-14: (with COMMENT)
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Stephen Farrell has entered the following ballot position for
draft-ietf-bfcpbis-bfcp-websocket-14: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------


- I support Ben's discuss and hope the discussion about the
gen-art review continues and reaches a good conclusion.

- WRT Kathleen's comment, while I think it'd be a fine thing
were HOBA usable with ws/wss, I doubt that browsers will do
that, so adding the reference may be misleading.



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From: Alexey Melnikov <aamelnikov@fastmail.fm>
To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>, The IESG <iesg@ietf.org>
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Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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Hi Ram,

On Mon, Jan 16, 2017, at 06:09 AM, Ram Mohan R (rmohanr) wrote:
> Hi Alexey,
> 
> Thanks for your feedback. Please see inline <Ram>

>     2) In Section 6: how is Websocket TLS server identity verified?
>     
>  [rfc7525] which is referred in this draft has some text (in Section 6)
>  on how server certs can be verified. Do you see a need to anything
>  specific in this draft?

As hostname verification is often omitted in naive implementations, I
would rather this was called out explicitly. For example:

6.  Security Considerations

   The WebSocket clients have to initiate the TCP connection to the
   WebSocket server identified by the FQDN in a=ws/a=wss-uri.  Further
   as with any other web connection, the clients will verify the servers
   certificate.  The WebSocket client MUST follow the procedures in
   [RFC7525] while setting up TLS connection with webSocket server.

I would insert "(including hostname verification as per section 6.1 in
[RFC7525])" after "[RFC7525]" above.

Best Regards,
Alexey


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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Alexey Melnikov <aamelnikov@fastmail.fm>, The IESG <iesg@ietf.org>
Thread-Topic: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
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Subject: Re: [bfcpbis] Kathleen Moriarty's No Objection on draft-ietf-bfcpbis-sdp-ws-uri-08: (with COMMENT)
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Ben Campbell <ben@nostrum.com>, The IESG <iesg@ietf.org>
Thread-Topic: Ben Campbell's Yes on draft-ietf-bfcpbis-sdp-ws-uri-08: (with COMMENT)
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Date: Mon, 30 Jan 2017 05:04:53 +0000
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Subject: Re: [bfcpbis] Ben Campbell's Yes on draft-ietf-bfcpbis-sdp-ws-uri-08: (with COMMENT)
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Alissa Cooper <alissa@cooperw.in>, Alexey Melnikov <aamelnikov@fastmail.fm>, Ben Campbell <ben@nostrum.com>
Thread-Topic: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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Date: Mon, 30 Jan 2017 05:30:22 +0000
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Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Spencer Dawkins <spencerdawkins.ietf@gmail.com>, The IESG <iesg@ietf.org>
Thread-Topic: Spencer Dawkins' Yes on draft-ietf-bfcpbis-bfcp-websocket-13: (with COMMENT)
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Date: Mon, 30 Jan 2017 11:24:48 +0000
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Subject: Re: [bfcpbis] Spencer Dawkins' Yes on draft-ietf-bfcpbis-bfcp-websocket-13: (with COMMENT)
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From nobody Mon Jan 30 07:11:39 2017
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Alexey Melnikov <aamelnikov@fastmail.fm>, The IESG <iesg@ietf.org>
Thread-Topic: Alexey Melnikov's No Objection on draft-ietf-bfcpbis-bfcp-websocket-13: (with COMMENT)
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Date: Mon, 30 Jan 2017 15:11:20 +0000
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Subject: Re: [bfcpbis] Alexey Melnikov's No Objection on draft-ietf-bfcpbis-bfcp-websocket-13: (with COMMENT)
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From nobody Mon Jan 30 07:12:05 2017
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Kathleen Moriarty <Kathleen.Moriarty.ietf@gmail.com>, The IESG <iesg@ietf.org>
Thread-Topic: Kathleen Moriarty's No Objection on draft-ietf-bfcpbis-bfcp-websocket-14: (with COMMENT)
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Date: Mon, 30 Jan 2017 15:12:00 +0000
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Subject: Re: [bfcpbis] Kathleen Moriarty's No Objection on draft-ietf-bfcpbis-bfcp-websocket-14: (with COMMENT)
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, The IESG <iesg@ietf.org>
Thread-Topic: Stephen Farrell's No Objection on draft-ietf-bfcpbis-bfcp-websocket-14: (with COMMENT)
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Date: Mon, 30 Jan 2017 15:13:27 +0000
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Subject: Re: [bfcpbis] Stephen Farrell's No Objection on draft-ietf-bfcpbis-bfcp-websocket-14: (with COMMENT)
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From nobody Mon Jan 30 08:24:47 2017
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From: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
Date: Mon, 30 Jan 2017 11:24:42 -0500
Message-ID: <CAHbuEH5qtF+qxBWfVwr0OVaUKr05QuD7kQc=iu0pcntW_xBnFw@mail.gmail.com>
To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
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Cc: "bfcpbis@ietf.org" <bfcpbis@ietf.org>, "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>, "draft-ietf-bfcpbis-bfcp-websocket@ietf.org" <draft-ietf-bfcpbis-bfcp-websocket@ietf.org>, The IESG <iesg@ietf.org>, "Charles Eckel \(eckelcu\)" <eckelcu@cisco.com>
Subject: Re: [bfcpbis] Kathleen Moriarty's No Objection on draft-ietf-bfcpbis-bfcp-websocket-14: (with COMMENT)
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Hi Ram,

On Mon, Jan 30, 2017 at 10:12 AM, Ram Mohan R (rmohanr)
<rmohanr@cisco.com> wrote:
> Hi Kathleen,
>
> Please see inline
>
> -----Original Message-----
> From: Kathleen Moriarty <Kathleen.Moriarty.ietf@gmail.com>
> Date: Thursday, 19 January 2017 at 1:10 AM
> To: The IESG <iesg@ietf.org>
> Cc: "draft-ietf-bfcpbis-bfcp-websocket@ietf.org" <draft-ietf-bfcpbis-bfcp=
-websocket@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, "bfcpb=
is-chairs@ietf.org" <bfcpbis-chairs@ietf.org>, "Charles Eckel (eckelcu)" <e=
ckelcu@cisco.com>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>
> Subject: Kathleen Moriarty's No Objection on draft-ietf-bfcpbis-bfcp-webs=
ocket-14: (with COMMENT)
> Resent-From: <alias-bounces@ietf.org>
> Resent-To: <anton.roman@quobis.com>, <stephane.cazeaux@orange.com>, <gsal=
guei@cisco.com>, <sergio.garcia.murillo@gmail.com>, <rmohanr@cisco.com>, <v=
ictor.pascual.avila@oracle.com>
> Resent-Date: Thursday, 19 January 2017 at 1:10 AM
>
>     Kathleen Moriarty has entered the following ballot position for
>     draft-ietf-bfcpbis-bfcp-websocket-14: No Objection
>
>     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 th=
is
>     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-bfcpbis-bfcp-websocket/
>
>
>
>     ---------------------------------------------------------------------=
-
>     COMMENT:
>     ---------------------------------------------------------------------=
-
>
>     I agree with Alexey's comment on section 8.  If fallback to HTTP
>     authentication happens, the implementer should be aware of the weakne=
sses
>     in HTTP basic [RFC7617] and digest [RFC7616] spelled out in the
>     respective security considerations sections.  The HTTPAuth WG put out=
 a
>     few experimental RFCs with methods to eliminate some of the weaknesse=
s,
>     like HOBA [RFC7486] that gets rid of the need for passwords.  Adding =
this
>     detail would be helpful.
>
> <Ram> Does this text looks ok ?
>
> EXISTING:
>          If the status code received from the server is not 101,
>           the WebSocket client stack handles the response per HTTP
>           [RFC7230] procedures, in particular the
>           client might perform authentication if it receives 401
>           status code.
> NEW:
>         If the status code received from the server is not 101,
>           the WebSocket client stack handles the response per HTTP
>           [RFC7230] procedures, in particular the
>           client might perform authentication if it receives 401
>           status code.  The WebSocket clients are vulnerable to the attac=
ks
>          of basic authentication (mentioned in Section 4 of [RFC7617]) an=
d
>         digest authentication (mentioned in Section 5 of [RFC7616]). To o=
vercome
>         some of these weakness, the WebSocket clients can use HTTP Origin=
-Bound Authentication (HOBA)
>         mechanism mentioned in [RFC7486].

This looks good, but HOBA is just one of 3 experimental options to
improve HTTPAuth.  SCRAM, RFC7804, is one of the other options, then
the third is in 3 RFCs that are int he RFC editor queue.  You could
list one as an example or maybe add in SCRAM too.

Thank you,
Kathleen
>
>
>
>



--=20

Best regards,
Kathleen


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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
Thread-Topic: Kathleen Moriarty's No Objection on draft-ietf-bfcpbis-bfcp-websocket-14: (with COMMENT)
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Date: Mon, 30 Jan 2017 16:42:54 +0000
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Subject: Re: [bfcpbis] Kathleen Moriarty's No Objection on draft-ietf-bfcpbis-bfcp-websocket-14: (with COMMENT)
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From nobody Mon Jan 30 09:25:25 2017
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References: <148476840952.2190.615912845986321795.idtracker@ietfa.amsl.com> <AF08277D-05E5-4C4F-A9ED-AA4C50C4CD9A@cisco.com> <CAHbuEH5qtF+qxBWfVwr0OVaUKr05QuD7kQc=iu0pcntW_xBnFw@mail.gmail.com> <5BE73E23-4BA9-4706-946C-2FC333E71EEB@cisco.com>
From: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
Date: Mon, 30 Jan 2017 12:25:17 -0500
Message-ID: <CAHbuEH7UXvpx60GCN_2D5GP6HwqShN04ANJjV7AjPyiARR7mYA@mail.gmail.com>
To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
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Subject: Re: [bfcpbis] Kathleen Moriarty's No Objection on draft-ietf-bfcpbis-bfcp-websocket-14: (with COMMENT)
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Thank you, Ram.

On Mon, Jan 30, 2017 at 11:42 AM, Ram Mohan R (rmohanr)
<rmohanr@cisco.com> wrote:
> HI Kathleen,
>
> I will add the text =E2=80=9Cas an example=E2=80=9D to the sentence.
>
> Thanks,
> Ram
>
> -----Original Message-----
> From: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
> Date: Monday, 30 January 2017 at 9:54 PM
> To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
> Cc: The IESG <iesg@ietf.org>, "draft-ietf-bfcpbis-bfcp-websocket@ietf.org=
" <draft-ietf-bfcpbis-bfcp-websocket@ietf.org>, "Charles Eckel (eckelcu)" <=
eckelcu@cisco.com>, "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>, "b=
fcpbis@ietf.org" <bfcpbis@ietf.org>
> Subject: Re: Kathleen Moriarty's No Objection on draft-ietf-bfcpbis-bfcp-=
websocket-14: (with COMMENT)
>
>     Hi Ram,
>
>     On Mon, Jan 30, 2017 at 10:12 AM, Ram Mohan R (rmohanr)
>     <rmohanr@cisco.com> wrote:
>     > Hi Kathleen,
>     >
>     > Please see inline
>     >
>     > -----Original Message-----
>     > From: Kathleen Moriarty <Kathleen.Moriarty.ietf@gmail.com>
>     > Date: Thursday, 19 January 2017 at 1:10 AM
>     > To: The IESG <iesg@ietf.org>
>     > Cc: "draft-ietf-bfcpbis-bfcp-websocket@ietf.org" <draft-ietf-bfcpbi=
s-bfcp-websocket@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, =
"bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>, "Charles Eckel (eckelc=
u)" <eckelcu@cisco.com>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>
>     > Subject: Kathleen Moriarty's No Objection on draft-ietf-bfcpbis-bfc=
p-websocket-14: (with COMMENT)
>     > Resent-From: <alias-bounces@ietf.org>
>     > Resent-To: <anton.roman@quobis.com>, <stephane.cazeaux@orange.com>,=
 <gsalguei@cisco.com>, <sergio.garcia.murillo@gmail.com>, <rmohanr@cisco.co=
m>, <victor.pascual.avila@oracle.com>
>     > Resent-Date: Thursday, 19 January 2017 at 1:10 AM
>     >
>     >     Kathleen Moriarty has entered the following ballot position for
>     >     draft-ietf-bfcpbis-bfcp-websocket-14: No Objection
>     >
>     >     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-cri=
teria.html
>     >     for more information about IESG DISCUSS and COMMENT positions.
>     >
>     >
>     >     The document, along with other ballot positions, can be found h=
ere:
>     >     https://datatracker.ietf.org/doc/draft-ietf-bfcpbis-bfcp-websoc=
ket/
>     >
>     >
>     >
>     >     ---------------------------------------------------------------=
-------
>     >     COMMENT:
>     >     ---------------------------------------------------------------=
-------
>     >
>     >     I agree with Alexey's comment on section 8.  If fallback to HTT=
P
>     >     authentication happens, the implementer should be aware of the =
weaknesses
>     >     in HTTP basic [RFC7617] and digest [RFC7616] spelled out in the
>     >     respective security considerations sections.  The HTTPAuth WG p=
ut out a
>     >     few experimental RFCs with methods to eliminate some of the wea=
knesses,
>     >     like HOBA [RFC7486] that gets rid of the need for passwords.  A=
dding this
>     >     detail would be helpful.
>     >
>     > <Ram> Does this text looks ok ?
>     >
>     > EXISTING:
>     >          If the status code received from the server is not 101,
>     >           the WebSocket client stack handles the response per HTTP
>     >           [RFC7230] procedures, in particular the
>     >           client might perform authentication if it receives 401
>     >           status code.
>     > NEW:
>     >         If the status code received from the server is not 101,
>     >           the WebSocket client stack handles the response per HTTP
>     >           [RFC7230] procedures, in particular the
>     >           client might perform authentication if it receives 401
>     >           status code.  The WebSocket clients are vulnerable to the=
 attacks
>     >          of basic authentication (mentioned in Section 4 of [RFC761=
7]) and
>     >         digest authentication (mentioned in Section 5 of [RFC7616])=
. To overcome
>     >         some of these weakness, the WebSocket clients can use HTTP =
Origin-Bound Authentication (HOBA)
>     >         mechanism mentioned in [RFC7486].
>
>     This looks good, but HOBA is just one of 3 experimental options to
>     improve HTTPAuth.  SCRAM, RFC7804, is one of the other options, then
>     the third is in 3 RFCs that are int he RFC editor queue.  You could
>     list one as an example or maybe add in SCRAM too.
>
>     Thank you,
>     Kathleen
>     >
>     >
>     >
>     >
>
>
>
>     --
>
>     Best regards,
>     Kathleen
>
>



--=20

Best regards,
Kathleen

