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From: "Ben Campbell" <ben@nostrum.com>
To: draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org, straw@ietf.org
Date: Mon, 05 Oct 2015 21:27:26 -0500
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Subject: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
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Hi,

This is my AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07. I think 
at least some of this needs to be resolved prior to IETF last call.

Thanks!

Ben.
-------------------


Comments and Questions
======================

- There's a marked lack of mention of B2BUAs that inspect or modify 
media content. I realize that this draft does not seek to enable that 
particular elephant-in-the-room. Is it worth mentioning them as out of 
scope? Does this draft intend to make them illegal for SRTP protected 
sessions with it's proscription about terminating dtls?

- 1.2: "The following sections describe the behavior B2BUAs MUST follow 
in
    order to avoid any impact to end-to-end DTLS-SRTP sessions."
Does that need the MUST, since the described behavior also uses 
normative language? Also, is this really a matter of things the b2bUA 
MUST do, or a set of other things it MUST NOT do?

Also, this paragraph could use some elaboration. There are a number of 
use cases that violate this(e.g. 3GPP's e2ea security model). This 
doesn't seem to forbid those, since they don't purport to support e2e 
crypto--is that the intent? Can "impact" be more precise?

-3.1.1, 3rd paragraph from end: "the B2BUA SHOULD be prepared
    to receive DTLS, STUN and media on the ports it advertised to Bob in
    the INVITE request. "

What are the consequences if it's not prepared to do so? Also, this is a 
timing issue, right? So shouldn't is say something like "SHOULD be 
prepared immediately prepared" or "should be prepared to 
receive...before the it receives the SIP response"?

-3.1.1, 2nd to last paragraph:
Is the a general proscription, or is it limited to cases where 4474bis 
is in use?

Also, I think the 4474bis reference needs to be normative, given that 
one needs to understand that draft to implement the normative bits about 
modifying anything protected by the signature. OTOH, does this need to 
reference 4474bis, or would 4474 suffice?

-3.1.2: "The mechanism described in Security Considerations section MUST 
be
    used by endpoint to detect malicious B2BUA’s that MAY attempt to
    terminate the DTLS-SRTP session."

I'm not sure it makes sense for this draft to put normative requirements 
on endpoints. Do you mean to say they "can" use
the mechanism? Also, that MAY is a statement of fact, not a normative 
requirement.

I'm confused by language about "inspect[ing] the RTP headers and RTCP 
packets" here and in the subsections. What do you mean about inspecting 
rtcp packets? Is this an attempt to dance around content inspection? 
Wont a good portion of the "rtcp packets" be encrypted?

- 3.1.2.2:
Is the point of this to say b2buas that modify things are out of scope? 
Not allowed?
The paragraph takes the form of "To do A, you must do B, and B is not 
allowed". It might be easier to say that "You can't do A, because of the 
issue with B."

Can you be more precise about what "break end-to-end security" means? 
e.g. the receiver would consider the packets invalid? Also, this 
paragraph might could use another mention of 4474/4474bis.

- 4: "Since DTLS operates on
    the 5-tuple"

What does that mean? It sounds something like "encrypts" or 
"authenticates" the 5, tuple--but I don't think that's what you mean.

"unique transport addresses"
Do you mean the b2bua must replace each answerers's address with a 
distinct address? Also do you mean distinct address, or distinct 
combination of address and port?

-5: "This document does not
    introduce any specific security considerations beyond those detailed
    in [RFC5763]."

It seems like the previous sentence qualified as a security 
consideration beyond those in 5763.


Editorial and nits
==================

- Section 1.1: "DTLS-SRTP is defined for point-
    to-point media sessions"
I suggest "currently defined". That's starting to change with PERC.

- 3.3, 3rd paragraph from end:
s/"B2BUA cannot decrypt..."/"The B2BUA cannot decrypt..."

- 3.3, 2nd to last paragraph: "the B2BUA MUST
    ensure that it does not modify..."
I suggest "the B2BUA MUST NOT modify..."

- 5:"A malicious B2BUA MAY try to
    break into the DTLS connection"
That shouldn't be a 2119 MAY; it's a statement of fact.












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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Ben Campbell <ben@nostrum.com>, "draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org" <draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org>, "straw@ietf.org" <straw@ietf.org>
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Subject: Re: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
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Hi Ben,

Thanks for your comments. Please see inline

-----Original Message-----
From: straw <straw-bounces@ietf.org> on behalf of Ben Campbell
<ben@nostrum.com>
Date: Tuesday, 6 October 2015 7:57 am
To: "draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org"
<draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org>, "straw@ietf.org"
<straw@ietf.org>
Subject: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07

>Hi,
>
>This is my AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07. I think
>at least some of this needs to be resolved prior to IETF last call.
>
>Thanks!
>
>Ben.
>-------------------
>
>
>Comments and Questions
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
>- There's a marked lack of mention of B2BUAs that inspect or modify
>media content. I realize that this draft does not seek to enable that
>particular elephant-in-the-room. Is it worth mentioning them as out of
>scope?=20

 In section 1.2 (Goals) we can add this text. Is this ok ?
EXISTING:
The following sections describe the behavior B2BUAs MUST follow in order
to avoid any impact to end-to-end DTLS-SRTP sessions.


NEW:
The following sections describe the behavior B2BUAs can follow to avoid
breaking end-to-end DTLS-SRTP sessions. B2BUAs terminating DTLS-SRTP
session are outside the scope of this document.



>Does this draft intend to make them illegal for SRTP protected
>sessions with it's proscription about terminating dtls?

The behaviour for cases where B2BUA terminates DTLS-SRTP is not in the
scope of this draft.



>
>- 1.2: "The following sections describe the behavior B2BUAs MUST follow
>in
>    order to avoid any impact to end-to-end DTLS-SRTP sessions."
>Does that need the MUST, since the described behavior also uses
>normative language?


I have re-worded this sentence as above.



>Also, is this really a matter of things the b2bUA
>MUST do, or a set of other things it MUST NOT do?

The draft tries to describe the behaviour that a B2BUA should follow and
this
includes what it should do and what it should not do.


>
>Also, this paragraph could use some elaboration. There are a number of
>use cases that violate this(e.g. 3GPP's e2ea security model). This
>doesn't seem to forbid those, since they don't purport to support e2e
>crypto--is that the intent? Can "impact" be more precise?

The sentence is re-worded now. Please see NEW text above.
The intent of this document is that B2BUA does not decrypt media. The
motivation for this comes out of the earlier discussions we had with
Stephen Farrell and in the WG where it was decided to
reduce the scope of the draft to not include B2BUAs that terminate
DTLS-SRTP sessions.


>
>-3.1.1, 3rd paragraph from end: "the B2BUA SHOULD be prepared
>    to receive DTLS, STUN and media on the ports it advertised to Bob in
>    the INVITE request. "
>
>What are the consequences if it's not prepared to do so?

The consequences can be - the messages may get dropped which in turn may
delay STUN/DTLS checks and would requires the endpoints to re-transmit the
messages.=20



> Also, this is a=20
>timing issue, right?

Yes. Its a timing issue.
> So shouldn't is say something like "SHOULD be
>prepared immediately prepared" or "should be prepared to
>receive...before the it receives the SIP response"?


I will re-word to:

EXISTING:
The B2BUA SHOULD be prepared to receive DTLS, STUN and media on the ports
it advertised to Bob in the INVITE request.


NEW:
The B2BUA SHOULD be prepared to receive DTLS, STUN and media on the ports
it advertised to Bob in the SIP offer before it receives a SIP answer from
Bob.



>
>-3.1.1, 2nd to last paragraph:
>Is the a general proscription, or is it limited to cases where 4474bis
>is in use?

It is for cases where 4474bis is in use.


>
>Also, I think the 4474bis reference needs to be normative, given that
>one needs to understand that draft to implement the normative bits about
>modifying anything protected by the signature. OTOH, does this need to
>reference 4474bis, or would 4474 suffice?

 rfc4474bis is appropriate since it defines mechanisms to use SDP
parameters (like a=3Dfingerprint) in the Identity header digest.
 We will use rfc4474bis and make the reference normative.


>
>-3.1.2: "The mechanism described in Security Considerations section MUST
>be
>    used by endpoint to detect malicious B2BUA=B9s that MAY attempt to
>    terminate the DTLS-SRTP session."
>
>I'm not sure it makes sense for this draft to put normative requirements
>on endpoints. Do you mean to say they "can" use
>the mechanism?=20

This has to be fixed. The idea is to have either endpoint or the SIP proxy
server in the endpoints network to generate Identity header on behalf of
the endpoint and perform identity validation procedure.


>Also, that MAY is a statement of fact, not a normative
>requirement.

Agree. Will re-word this para to
NEW:
The identity validation mechanism described in Security Considerations
section MUST be used by the endpoint or the proxy server in the endpoints
network to detect malicious B2BUAs that attempt to
terminate the DTLS-SRTP session


>
>I'm confused by language about "inspect[ing] the RTP headers and RTCP
>packets" here and in the subsections. What do you mean about inspecting
>rtcp packets? Is this an attempt to dance around content inspection?
>Wont a good portion of the "rtcp packets" be encrypted?

Yes. A B2BUA can inspect the unencrypted portions of the RTCP packet.

>
>- 3.1.2.2:
>Is the point of this to say b2buas that modify things are out of scope?

Yes. Not in scope.

>=20
>Not allowed?
>The paragraph takes the form of "To do A, you must do B, and B is not
>allowed". It might be easier to say that "You can't do A, because of the
>issue with B."

Ok. Will re-word this sentence to some thing like this:

NEW:
A B2BUA cannot modify RTP headers or RTCP packets, as to do so it needs to
act as a DTLS endpoint, terminate the DTLS-SRTP session and
decrypt/re-encrypt RTP packet.





>
>Can you be more precise about what "break end-to-end security" means?
>e.g. the receiver would consider the packets invalid? Also, this
>paragraph might could use another mention of 4474/4474bis.

How about this:
EXISTING:
This would break end-to-end security and hence a B2BUA MUST NOT
terminate DTLS-SRTP session.


NEW:
This would cause the identity verification procedure discussed in 4474bis
to fail and hence a B2BUA MUST NOT terminate the DTLS-SRTP session.


>
>- 4: "Since DTLS operates on
>    the 5-tuple"
>
>What does that mean? It sounds something like "encrypts" or
>"authenticates" the 5, tuple--but I don't think that's what you mean.

How about this ?
"Since each DTLS connection is setup on a unique 5-tuple.."


>
>"unique transport addresses"
>Do you mean the b2bua must replace each answerers's address with a
>distinct address? Also do you mean distinct address, or distinct
>combination of address and port?

Transport address means IP address and port


>
>-5: "This document does not
>    introduce any specific security considerations beyond those detailed
>    in [RFC5763]."
>
>It seems like the previous sentence qualified as a security
>consideration beyond those in 5763.

Will re-word to:
"Security considerations discussed in [RFC5763] are also applicable to
this document."


>
>
>Editorial and nits
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
>- Section 1.1: "DTLS-SRTP is defined for point-
>    to-point media sessions"
>I suggest "currently defined". That's starting to change with PERC.
>
>- 3.3, 3rd paragraph from end:
>s/"B2BUA cannot decrypt..."/"The B2BUA cannot decrypt..."
>
>- 3.3, 2nd to last paragraph: "the B2BUA MUST
>    ensure that it does not modify..."
>I suggest "the B2BUA MUST NOT modify..."
>
>- 5:"A malicious B2BUA MAY try to
>    break into the DTLS connection"
>That shouldn't be a 2119 MAY; it's a statement of fact.

Will fix all the NITS above.

Regards,
Ram

>
>
>
>
>
>
>
>
>
>
>
>_______________________________________________
>straw mailing list
>straw@ietf.org
>https://www.ietf.org/mailman/listinfo/straw


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Thanks for the response. Further comments inline. I removed sections 
that don't appear to need further discussion.

Thanks!

Ben.

On 8 Oct 2015, at 4:41, Ram Mohan R (rmohanr) wrote:
>>

[...]

>>
>>
>> Comments and Questions
>> ======================
>>
>> - There's a marked lack of mention of B2BUAs that inspect or modify
>> media content. I realize that this draft does not seek to enable that
>> particular elephant-in-the-room. Is it worth mentioning them as out 
>> of
>> scope?
>
> In section 1.2 (Goals) we can add this text. Is this ok ?
> EXISTING:
> The following sections describe the behavior B2BUAs MUST follow in 
> order
> to avoid any impact to end-to-end DTLS-SRTP sessions.
>
>
> NEW:
> The following sections describe the behavior B2BUAs can follow to 
> avoid
> breaking end-to-end DTLS-SRTP sessions. B2BUAs terminating DTLS-SRTP
> session are outside the scope of this document.

I think that's moving in the right direction, but there's normative text 
elsewhere that says b2buas MUST NOT terminate dtls-srtp. Would it make 
sense to say something like "B2BUAs that inspect or modify media content 
are outside the scope of this document"?

Or is it the intent to forbid such devices?

>> Does this draft intend to make them illegal for SRTP protected
>> sessions with it's proscription about terminating dtls?
>
> The behaviour for cases where B2BUA terminates DTLS-SRTP is not in the
> scope of this draft.
>

See above comment about normative statements concerning the termination 
of dtls-srtp.

[...]

>>
>> -3.1.1, 3rd paragraph from end: "the B2BUA SHOULD be prepared
>>  to receive DTLS, STUN and media on the ports it advertised to Bob in
>>  the INVITE request. "
>>
>> What are the consequences if it's not prepared to do so?
>
> The consequences can be - the messages may get dropped which in turn 
> may
> delay STUN/DTLS checks and would requires the endpoints to re-transmit 
> the
> messages.
>

Given that this is a SHOULD rather than a MUST, it would be useful to 
describe those consequences in the text.

[...]

>>
>> Also, I think the 4474bis reference needs to be normative, given that
>> one needs to understand that draft to implement the normative bits 
>> about
>> modifying anything protected by the signature. OTOH, does this need 
>> to
>> reference 4474bis, or would 4474 suffice?
>
> rfc4474bis is appropriate since it defines mechanisms to use SDP
> parameters (like a=fingerprint) in the Identity header digest.
> We will use rfc4474bis and make the reference normative.

Your response is reasonable, but keep in mind that will block 
publication of this draft until 4474bis is published.

>
>
>>
>> -3.1.2: "The mechanism described in Security Considerations section 
>> MUST
>> be
>>  used by endpoint to detect malicious B2BUA¹s that MAY attempt to
>>  terminate the DTLS-SRTP session."
>>
>> I'm not sure it makes sense for this draft to put normative 
>> requirements
>> on endpoints. Do you mean to say they "can" use
>> the mechanism?
>
> This has to be fixed. The idea is to have either endpoint or the SIP 
> proxy
> server in the endpoints network to generate Identity header on behalf 
> of
> the endpoint and perform identity validation procedure.

I'm not sure I understand what you mean by "this has to be fixed". Do 
you mean fixed in the draft, or that endpoints need to fix behavior?

[...]

>
>>
>> I'm confused by language about "inspect[ing] the RTP headers and RTCP
>> packets" here and in the subsections. What do you mean about 
>> inspecting
>> rtcp packets? Is this an attempt to dance around content inspection?
>> Wont a good portion of the "rtcp packets" be encrypted?
>
> Yes. A B2BUA can inspect the unencrypted portions of the RTCP packet.
>

The wording "and RTCP packets" may lead people to believe it can inspect 
the entire packet. It might be worth saying "unencrypted parts of the 
RTCP packet". It's probably not necessary to say that every time, since 
it complicates the sentence structure, but it would be helpful to do so 
at least the first time.

[...]

>> The paragraph takes the form of "To do A, you must do B, and B is not
>> allowed". It might be easier to say that "You can't do A, because of 
>> the
>> issue with B."
>
> Ok. Will re-word this sentence to some thing like this:
>
> NEW:
> A B2BUA cannot modify RTP headers or RTCP packets, as to do so it 
> needs to
> act as a DTLS endpoint, terminate the DTLS-SRTP session and
> decrypt/re-encrypt RTP packet.

I suggest "...it would need to...". Otherwise that looks good.

>>
>> Can you be more precise about what "break end-to-end security" means?
>> e.g. the receiver would consider the packets invalid? Also, this
>> paragraph might could use another mention of 4474/4474bis.
>
> How about this:
> EXISTING:
> This would break end-to-end security and hence a B2BUA MUST NOT
> terminate DTLS-SRTP session.
>
>
> NEW:
> This would cause the identity verification procedure discussed in 
> 4474bis
> to fail and hence a B2BUA MUST NOT terminate the DTLS-SRTP session.
>

I suggest "identity and integrity protection procedures". Otherwise it 
looks good.

>
>>
>> - 4: "Since DTLS operates on
>>  the 5-tuple"
>>
>> What does that mean? It sounds something like "encrypts" or
>> "authenticates" the 5, tuple--but I don't think that's what you mean.
>
> How about this ?
> "Since each DTLS connection is setup on a unique 5-tuple.."

Works for me.

>
>
>>
>> "unique transport addresses"
>> Do you mean the b2bua must replace each answerers's address with a
>> distinct address? Also do you mean distinct address, or distinct
>> combination of address and port?
>
> Transport address means IP address and port
>

I'm not sure everyone will read it that way, unless you define that in 
the draft or reference a definition.

[...]


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Subject: Re: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
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On 10/8/15 9:19 AM, Ben Campbell wrote:

>>> I'm confused by language about "inspect[ing] the RTP headers and RTCP
>>> packets" here and in the subsections. What do you mean about inspecting
>>> rtcp packets? Is this an attempt to dance around content inspection?
>>> Wont a good portion of the "rtcp packets" be encrypted?
>>
>> Yes. A B2BUA can inspect the unencrypted portions of the RTCP packet.
>>
>
> The wording "and RTCP packets" may lead people to believe it can inspect
> the entire packet. It might be worth saying "unencrypted parts of the
> RTCP packet". It's probably not necessary to say that every time, since
> it complicates the sentence structure, but it would be helpful to do so
> at least the first time.

There is no point in specifying that the B2BUA cannot (or MUST not) 
inspect encrypted parts. It *can* inspect the encrypted data. And that 
is not a problem as long as it doesn't have the keys to decrypt it.

All you can meaningfully do is observe that the B2BUA does not have the 
ability to inspect the unencrypted form of encrypted data that flows 
through it.

I think this applies to several points that discuss inspection.

	Thanks,
	Paul




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From: "Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "straw@ietf.org" <straw@ietf.org>
Thread-Topic: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
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Subject: Re: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
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> -----Original Message-----
> From: straw [mailto:straw-bounces@ietf.org] On Behalf Of Paul Kyzivat
> Sent: Thursday, October 08, 2015 7:57 PM
> To: straw@ietf.org
> Subject: Re: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
>=20
> On 10/8/15 9:19 AM, Ben Campbell wrote:
>=20
> >>> I'm confused by language about "inspect[ing] the RTP headers and
> >>> RTCP packets" here and in the subsections. What do you mean about
> >>> inspecting rtcp packets? Is this an attempt to dance around content
> inspection?
> >>> Wont a good portion of the "rtcp packets" be encrypted?
> >>
> >> Yes. A B2BUA can inspect the unencrypted portions of the RTCP packet.
> >>
> >
> > The wording "and RTCP packets" may lead people to believe it can
> > inspect the entire packet. It might be worth saying "unencrypted parts
> > of the RTCP packet". It's probably not necessary to say that every
> > time, since it complicates the sentence structure, but it would be
> > helpful to do so at least the first time.
>=20
> There is no point in specifying that the B2BUA cannot (or MUST not) inspe=
ct
> encrypted parts. It *can* inspect the encrypted data. And that is not a
> problem as long as it doesn't have the keys to decrypt it.
>=20
> All you can meaningfully do is observe that the B2BUA does not have the
> ability to inspect the unencrypted form of encrypted data that flows thro=
ugh
> it.
>=20
> I think this applies to several points that discuss inspection.

Agreed.

-Tiru

>=20
> 	Thanks,
> 	Paul
>=20
>=20
>=20
> _______________________________________________
> straw mailing list
> straw@ietf.org
> https://www.ietf.org/mailman/listinfo/straw


From nobody Thu Oct  8 09:48:22 2015
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From: "Ben Campbell" <ben@nostrum.com>
To: "Tirumaleswar Reddy" <tireddy@cisco.com>
Date: Thu, 08 Oct 2015 12:48:08 -0400
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References: <88387F56-0E5F-40AF-A0A7-B826D73F93D1@nostrum.com> <D23C2421.45387%rmohanr@cisco.com> <B53E28FC-4416-47CB-8ECF-ECDFB143AC23@nostrum.com> <fb059be652994117ae030f9a654f1f63@XCH-RCD-017.cisco.com>
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Cc: Ram Mohan R <rmohanr@cisco.com>, "draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org" <draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org>, "straw@ietf.org" <straw@ietf.org>
Subject: Re: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
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On 8 Oct 2015, at 10:45, Tirumaleswar Reddy (tireddy) wrote:

>> -----Original Message-----
>> From: Ben Campbell [mailto:ben@nostrum.com]
>> Sent: Thursday, October 08, 2015 6:49 PM
>> To: Ram Mohan R (rmohanr)
>> Cc: draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org; straw@ietf.org
>> Subject: Re: [straw] AD Evaluation of 
>> draft-ietf-straw-b2bua-dtls-srtp-07
>>
>> Thanks for the response. Further comments inline. I removed sections 
>> that
>> don't appear to need further discussion.
>>
>> Thanks!
>>
>> Ben.
>>
>> On 8 Oct 2015, at 4:41, Ram Mohan R (rmohanr) wrote:
>>>>
>>
>> [...]
>>
>>>>
>>>>
>>>> Comments and Questions
>>>> ======================
>>>>
>>>> - There's a marked lack of mention of B2BUAs that inspect or modify
>>>> media content. I realize that this draft does not seek to enable 
>>>> that
>>>> particular elephant-in-the-room. Is it worth mentioning them as out
>>>> of scope?
>>>
>>> In section 1.2 (Goals) we can add this text. Is this ok ?
>>> EXISTING:
>>> The following sections describe the behavior B2BUAs MUST follow in
>>> order to avoid any impact to end-to-end DTLS-SRTP sessions.
>>>
>>>
>>> NEW:
>>> The following sections describe the behavior B2BUAs can follow to
>>> avoid
>>> breaking end-to-end DTLS-SRTP sessions.
>> B2BUAs terminating DTLS-SRTP
>>> session are outside the scope of this document.
>
> I think the above line is not required. This doc discusses the problem 
> with B2BUAs terminating DTLS-SRTP session, mechanism to detect such 
> B2BUA and says that B2BUA must not to be enabled in this mode.
>

See next comment...

>>
>> I think that's moving in the right direction, but there's normative 
>> text
>> elsewhere that says b2buas MUST NOT terminate dtls-srtp. Would it 
>> make
>> sense to say something like "B2BUAs that inspect or modify media 
>> content
>> are outside the scope of this document"?
>>
>> Or is it the intent to forbid such devices ?
>
> The intent is to prohibit such devices because of the privacy concern.

That's a different answer than Ram gave. Content aware/modifying B2BUAs 
cannot both be forbidden and out-of-scope at the same time.

I think the confusion here is around whether this draft should say 
b2buas MUST not terminate dtls-srtp, or to say that they cannot under 
most circumstances without breaking 4474/4474bis identity signatures. 
The former needs 2119 language, the latter is just a statement of fact.

There are some exceptions to the "cannot" in the above paragraph. For 
example, a b2bua that is collocated with the offerer's identity service 
could modify fingerprints prior to applying the identity signature. Or 
since 5763 only says endpoints SHOULD use 4474, a b2bua might see 
unprotected fingerprints and attempt to modify them.  Does this draft 
mean to forbid those behaviors?

>
>>
>>>> Does this draft intend to make them illegal for SRTP protected
>>>> sessions with it's proscription about terminating dtls?
>>>
>>> The behaviour for cases where B2BUA terminates DTLS-SRTP is not in 
>>> the
>>> scope of this draft.
>>>
>>
>> See above comment about normative statements concerning the 
>> termination
>> of dtls-srtp.
>>
>> [...]
>>
>>>>
>>>> -3.1.1, 3rd paragraph from end: "the B2BUA SHOULD be prepared
>>>> to receive DTLS, STUN and media on the ports it advertised to Bob 
>>>> in
>>>> the INVITE request. "
>>>>
>>>> What are the consequences if it's not prepared to do so?
>>>
>>> The consequences can be - the messages may get dropped which in turn
>>> may
>>> delay STUN/DTLS checks and would requires the endpoints to 
>>> re-transmit
>>> the
>>> messages.
>>>
>>
>> Given that this is a SHOULD rather than a MUST, it would be useful to
>> describe those consequences in the text.
>
> The other alternative would be to change from SHOULD to MUST and avoid 
> the above problems.

I would not object to that--although on reflection, isn't this 
requirement true of all b2buas? That is, is it in any way specific to 
dtls-srtp?  Is that documented elsewhere?

>
>>
>> [...]
>>
>>>>
>>>> Also, I think the 4474bis reference needs to be normative, given 
>>>> that
>>>> one needs to understand that draft to implement the normative bits
>>>> about
>>>> modifying anything protected by the signature. OTOH, does this need
>>>> to
>>>> reference 4474bis, or would 4474 suffice?
>>>
>>> rfc4474bis is appropriate since it defines mechanisms to use SDP
>>> parameters (like a=fingerprint) in the Identity header digest.
>>> We will use rfc4474bis and make the reference normative.
>>
>> Your response is reasonable, but keep in mind that will block
>> publication of this draft until 4474bis is published.
>
> Yes, https://tools.ietf.org/html/rfc4474#section-13.1 discusses 
> signature over the SIP bodies but does not go into detail like 
> rfc4474bis explains using fingerprint for generating assertion. Would 
> it be okay to have normative reference of rfc4474 and informative 
> reference of rfc4474bis ?

Both protect the fingerprint. 4474 just does it by protecting the entire 
body. 4474bis has the may be more deployable. But it seems to me that 
either work for the purposes of this draft. And since 4474bis proposes 
to obsolete 4474, a reference to 4474 will effectively become a 
reference to 4474bis.

 >
>
>>
>>>
>>>
>>>>
>>>> -3.1.2: "The mechanism described in Security Considerations section
>>>> MUST
>>>> be
>>>> used by endpoint to detect malicious B2BUA¹s that MAY attempt to
>>>> terminate the DTLS-SRTP session."
>>>>
>>>> I'm not sure it makes sense for this draft to put normative
>>>> requirements
>>>> on endpoints. Do you mean to say they "can" use
>>>> the mechanism?
>>>
>>> This has to be fixed. The idea is to have either endpoint or the SIP
>>> proxy
>>> server in the endpoints network to generate Identity header on 
>>> behalf
>>> of
>>> the endpoint and perform identity validation procedure.
>>
>> I'm not sure I understand what you mean by "this has to be fixed". Do
>> you mean fixed in the draft, or that endpoints need to fix behavior?
>
> I think Ram meant fix the draft.

In any case, if this draft places new normative requirements on 
dtsl-srtp endpoints or identity services, it would need to update 5763.

[...]


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Subject: Re: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
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On 10/8/15 12:48 PM, Ben Campbell wrote:

> There are some exceptions to the "cannot" in the above paragraph. For
> example, a b2bua that is collocated with the offerer's identity service
> could modify fingerprints prior to applying the identity signature.

A similar situation (or maybe just another way of talking about the same 
one) is that a B2BUA that can sign for the user might just be considered 
to *be* the caller in the call. The leg from that B2BUA to the "actual" 
UA can be considered to just be the implementation of a deconstructed UA.

I don't know whether to consider that a bug or a feature. I don't see 
any way to forbid this.

	Thanks,
	Paul



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From: "Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com>
To: Ben Campbell <ben@nostrum.com>
Thread-Topic: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
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Subject: Re: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Sip Traversal Required for Applications to Work Working Group of the IETF.

        Title           : Guidelines to support RTCP end-to-end in Back-to-Back User Agents (B2BUAs)
        Authors         : Lorenzo Miniero
                          Sergio Garcia Murillo
                          Victor Pascual
	Filename        : draft-ietf-straw-b2bua-rtcp-08.txt
	Pages           : 18
	Date            : 2015-10-13

Abstract:
   SIP Back-to-Back User Agents (B2BUAs) are often envisaged to also be
   on the media path, rather than just intercepting signalling.  This
   means that B2BUAs often implement an RTP/RTCP stack as well, whether
   to act as media transcoders or to just passthrough the media
   themselves, thus leading to separate multimedia sessions that the
   B2BUA correlates and bridges together.  If not disciplined, though,
   this behaviour can severely impact the communication experience,
   especially when statistics and feedback information contained in RTCP
   packets get lost because of mismatches in the reported data.

   This document defines the proper behaviour B2BUAs should follow when
   also acting on the signalling/media plane in order to preserve the
   end-to-end functionality of RTCP.


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

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-straw-b2bua-rtcp-08

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-straw-b2bua-rtcp-08


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

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


From nobody Fri Oct 16 15:41:16 2015
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From: "Ben Campbell" <ben@nostrum.com>
To: "Tirumaleswar Reddy" <tireddy@cisco.com>
Date: Fri, 16 Oct 2015 17:41:08 -0500
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Cc: Ram Mohan R <rmohanr@cisco.com>, "draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org" <draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org>, "straw@ietf.org" <straw@ietf.org>
Subject: Re: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
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Hi,

What's the status of the update?

Also, a few more comments inline:

Thanks!

Ben.


On 9 Oct 2015, at 6:55, Tirumaleswar Reddy (tireddy) wrote:

>> -----Original Message-----
>> From: Ben Campbell [mailto:ben@nostrum.com]
>> Sent: Thursday, October 08, 2015 10:18 PM
>> To: Tirumaleswar Reddy (tireddy)
>> Cc: Ram Mohan R (rmohanr); 
>> draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org;
>> straw@ietf.org
>> Subject: Re: [straw] AD Evaluation of 
>> draft-ietf-straw-b2bua-dtls-srtp-07
>>
>>
>>
>> On 8 Oct 2015, at 10:45, Tirumaleswar Reddy (tireddy) wrote:
>>
>>>> -----Original Message-----
>>>> From: Ben Campbell [mailto:ben@nostrum.com]
>>>> Sent: Thursday, October 08, 2015 6:49 PM
>>>> To: Ram Mohan R (rmohanr)
>>>> Cc: draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org; straw@ietf.org
>>>> Subject: Re: [straw] AD Evaluation of
>>>> draft-ietf-straw-b2bua-dtls-srtp-07
>>>>
>>>> Thanks for the response. Further comments inline. I removed 
>>>> sections
>>>> that don't appear to need further discussion.
>>>>
>>>> Thanks!
>>>>
>>>> Ben.
>>>>
>>>> On 8 Oct 2015, at 4:41, Ram Mohan R (rmohanr) wrote:
>>>>>>
>>>>
>>>> [...]
>>>>
>>>>>>
>>>>>>
>>>>>> Comments and Questions
>>>>>> ======================
>>>>>>
>>>>>> - There's a marked lack of mention of B2BUAs that inspect or 
>>>>>> modify
>>>>>> media content. I realize that this draft does not seek to enable
>>>>>> that particular elephant-in-the-room. Is it worth mentioning them
>>>>>> as out of scope?
>>>>>
>>>>> In section 1.2 (Goals) we can add this text. Is this ok ?
>>>>> EXISTING:
>>>>> The following sections describe the behavior B2BUAs MUST follow in
>>>>> order to avoid any impact to end-to-end DTLS-SRTP sessions.
>>>>>
>>>>>
>>>>> NEW:
>>>>> The following sections describe the behavior B2BUAs can follow to
>>>>> avoid breaking end-to-end DTLS-SRTP sessions.
>>>> B2BUAs terminating DTLS-SRTP
>>>>> session are outside the scope of this document.
>>>
>>> I think the above line is not required. This doc discusses the 
>>> problem
>>> with B2BUAs terminating DTLS-SRTP session, mechanism to detect such
>>> B2BUA and says that B2BUA must not to be enabled in this mode.
>>>
>>
>> See next comment...
>>
>>>>
>>>> I think that's moving in the right direction, but there's normative
>>>> text elsewhere that says b2buas MUST NOT terminate dtls-srtp. Would
>>>> it make sense to say something like "B2BUAs that inspect or modify
>>>> media content are outside the scope of this document"?
>>>>
>>>> Or is it the intent to forbid such devices ?
>>>
>>> The intent is to prohibit such devices because of the privacy 
>>> concern.
>>
>> That's a different answer than Ram gave. Content aware/modifying 
>> B2BUAs
>> cannot both be forbidden and out-of-scope at the same time.
>>
>> I think the confusion here is around whether this draft should say 
>> b2buas
>> MUST not terminate dtls-srtp, or to say that they cannot under most
>> circumstances without breaking 4474/4474bis identity signatures.
>> The former needs 2119 language, the latter is just a statement of 
>> fact.
>
> I think we should go with the former, otherwise it creates a privacy 
> problem.

While I agree with the sentiment, there's a bit of a standing problem 
here. We can't really force B2BUA vendors to even read this spec, much 
less comply with it. So this seems to be an attempt to put requirements 
on devices that don't implement the spec containing the requirement.

So it seems to me the best we can do is take the approach of saying 
something to the effect of "The dtls-srtp framework recommends that 
endpoints use RFC4474 to integrity protect the fingerprint attributes. 
Thus, under most circumstances, B2BUAs cannot terminate the dtls-srtp 
connection without invalidating the signature and causing the session to 
fail."

Basically, that effectively makes the scope of the draft "How b2bua's 
that want to play nice with dtls-srtp" can avoid breaking things".

>
>>
>> There are some exceptions to the "cannot" in the above paragraph. For
>> example, a b2bua that is collocated with the offerer's identity 
>> service could
>> modify fingerprints prior to applying the identity signature. Or 
>> since 5763
>> only says endpoints SHOULD use 4474, a b2bua might see unprotected
>> fingerprints and attempt to modify them.  Does this draft mean to 
>> forbid
>> those behaviors?
>
> Endpoint or SIP proxy in the endpoints network has to insert the 
> identity assertion to avoid B2BUA in the signaling path from 
> terminating the DTLS connection and decrypting the media. WebRTC also 
> has the same problem that without IdP and identity assertion, 
> malicious signaling server can decrypt the media.

Right. I don't think this draft can prevent that. But it can rule it out 
of scope.

>
>>
>>>
>>>>
>>>>>> Does this draft intend to make them illegal for SRTP protected
>>>>>> sessions with it's proscription about terminating dtls?
>>>>>
>>>>> The behaviour for cases where B2BUA terminates DTLS-SRTP is not in
>>>>> the scope of this draft.
>>>>>
>>>>
>>>> See above comment about normative statements concerning the
>>>> termination of dtls-srtp.
>>>>
>>>> [...]
>>>>
>>>>>>
>>>>>> -3.1.1, 3rd paragraph from end: "the B2BUA SHOULD be prepared to
>>>>>> receive DTLS, STUN and media on the ports it advertised to Bob in
>>>>>> the INVITE request. "
>>>>>>
>>>>>> What are the consequences if it's not prepared to do so?
>>>>>
>>>>> The consequences can be - the messages may get dropped which in 
>>>>> turn
>>>>> may delay STUN/DTLS checks and would requires the endpoints to
>>>>> re-transmit the messages.
>>>>>
>>>>
>>>> Given that this is a SHOULD rather than a MUST, it would be useful 
>>>> to
>>>> describe those consequences in the text.
>>>
>>> The other alternative would be to change from SHOULD to MUST and 
>>> avoid
>>> the above problems.
>>
>> I would not object to that--although on reflection, isn't this 
>> requirement true
>> of all b2buas? That is, is it in any way specific to dtls-srtp?  Is 
>> that
>> documented elsewhere?
>
> I don't think any other doc is discussing this point.

Okay. It might have been better to have that in a more general spec than 
this, but it doesn't hurt to have it here as well.

>
>>
>>>
>>>>
>>>> [...]
>>>>
>>>>>>
>>>>>> Also, I think the 4474bis reference needs to be normative, given
>>>>>> that
>>>>>> one needs to understand that draft to implement the normative 
>>>>>> bits
>>>>>> about
>>>>>> modifying anything protected by the signature. OTOH, does this 
>>>>>> need
>>>>>> to
>>>>>> reference 4474bis, or would 4474 suffice?
>>>>>
>>>>> rfc4474bis is appropriate since it defines mechanisms to use SDP
>>>>> parameters (like a=fingerprint) in the Identity header digest.
>>>>> We will use rfc4474bis and make the reference normative.
>>>>
>>>> Your response is reasonable, but keep in mind that will block
>>>> publication of this draft until 4474bis is published.
>>>
>>> Yes, https://tools.ietf.org/html/rfc4474#section-13.1 discusses
>>> signature over the SIP bodies but does not go into detail like
>>> rfc4474bis explains using fingerprint for generating assertion. 
>>> Would
>>> it be okay to have normative reference of rfc4474 and informative
>>> reference of rfc4474bis ?
>>
>> Both protect the fingerprint. 4474 just does it by protecting the 
>> entire
>> body. 4474bis has the may be more deployable. But it seems to me that
>> either work for the purposes of this draft. And since 4474bis 
>> proposes
>> to obsolete 4474, a reference to 4474 will effectively become a
>> reference to 4474bis.
>
> Thanks, will update draft.
>
>>
>>>
>>>
>>>>
>>>>>
>>>>>
>>>>>>
>>>>>> -3.1.2: "The mechanism described in Security Considerations 
>>>>>> section
>>>>>> MUST
>>>>>> be
>>>>>> used by endpoint to detect malicious B2BUA¹s that MAY attempt to
>>>>>> terminate the DTLS-SRTP session."
>>>>>>
>>>>>> I'm not sure it makes sense for this draft to put normative
>>>>>> requirements
>>>>>> on endpoints. Do you mean to say they "can" use
>>>>>> the mechanism?
>>>>>
>>>>> This has to be fixed. The idea is to have either endpoint or the 
>>>>> SIP
>>>>> proxy
>>>>> server in the endpoints network to generate Identity header on
>>>>> behalf
>>>>> of
>>>>> the endpoint and perform identity validation procedure.
>>>>
>>>> I'm not sure I understand what you mean by "this has to be fixed". 
>>>> Do
>>>> you mean fixed in the draft, or that endpoints need to fix 
>>>> behavior?
>>>
>>> I think Ram meant fix the draft.
>>
>> In any case, if this draft places new normative requirements on
>> dtsl-srtp endpoints or identity services, it would need to update 
>> 5763.
>
> Yes, will update that this doc updates 5763.
>
> Cheers,
> -Tiru
>
>>
>> [...]
> _______________________________________________
> straw mailing list
> straw@ietf.org
> https://www.ietf.org/mailman/listinfo/straw


From nobody Fri Oct 16 21:37:45 2015
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Ben Campbell <ben@nostrum.com>, "Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com>
Thread-Topic: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
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Subject: Re: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>, Ben Campbell <ben@nostrum.com>, "Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com>
Thread-Topic: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
Thread-Index: AQHRCVTHQCAS/Xc7NkmXzWtjiZxHmQ==
Date: Sun, 18 Oct 2015 03:26:30 +0000
Message-ID: <D2490FA1.4642B%rmohanr@cisco.com>
References: <5e3c9e3e2f8c4bd8bb594a382a1f2d70@XCH-RCD-017.cisco.com> <31791F35-F3B0-4BF8-8D4C-E95224E168C2@nostrum.com> <D247C09C.46311%rmohanr@cisco.com>
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Subject: Re: [straw] AD Evaluation of draft-ietf-straw-b2bua-dtls-srtp-07
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Content-Description: draft-ietf-straw-b2bua-dtls-srtp-08.txt
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--_003_D2490FA14642Brmohanrciscocom_--


From nobody Mon Oct 19 09:09:27 2015
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Sip Traversal Required for Applications to Work Working Group of the IETF.

        Title           : DTLS-SRTP Handling in Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)
        Authors         : Ram Mohan Ravindranath
                          Tirumaleswar Reddy
                          Gonzalo Salgueiro
                          Victor Pascual
                          Parthasarathi Ravindran
	Filename        : draft-ietf-straw-b2bua-dtls-srtp-08.txt
	Pages           : 12
	Date            : 2015-10-19

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


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

There's also a htmlized version available at:
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A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-straw-b2bua-dtls-srtp-08


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

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


From nobody Mon Oct 26 19:49:05 2015
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From: "Ben Campbell" <ben@nostrum.com>
To: straw@ietf.org, draft-ietf-straw-b2bua-dtls-srtp.all@ietf.org
Date: Mon, 26 Oct 2015 21:49:13 -0500
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Subject: Re: [straw] I-D Action: draft-ietf-straw-b2bua-dtls-srtp-08.txt
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Hi,

This version addresses many of my comments. I'm going to go ahead and 
send start the IETF last call process.  I do have a few new or remaining 
comments, but these can be handled with along with other IETF last call 
comments.

Thanks!

Ben.

- 1.2, last paragraph:

The first sentence still contains a MUST that I thought was going to go 
away. Ram proposed the following, that did not seem to make it into the 
draft:

"The following sections describe the behavior B2BUAs can follow to avoid
breaking end-to-end DTLS-SRTP sessions. B2BUAs terminating DTLS-SRTP
session are outside the scope of this document."

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

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

Should SIP offer and SIP answer be SDP offer and SDP answer?

- 3.1.1, last paragraph:

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

- 3.1.2: "The identity
    integrity protection procedures described in Security Considerations
    section MUST be used by the endpoint or the proxy server in the
    endpoints network to detect malicious B2BUAs that attempt to
    terminate the DTLS-SRTP session."

I think this is still not quite right. This draft is not about 
endpoints, and therefore can't really introduce normative requirements 
on the endpoints (except for the case the endpoint is a B2BUA.). To do 
so would require updating 3261 and a bunch of other specs. This needs to 
be stated non-normatively, and the security considerations already do 
that.

"...generate the identity..."

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

- 3.1.2.1 and 3.1.2.2

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



On 19 Oct 2015, at 11:09, internet-drafts@ietf.org wrote:

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


From nobody Tue Oct 27 05:10:55 2015
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Subject: [straw] Last Call: <draft-ietf-straw-b2bua-dtls-srtp-08.txt> (DTLS-SRTP Handling in Session Initiation Protocol (SIP) Back-to-Back User Agents (B2BUAs)) to Proposed Standard
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The IESG has received a request from the Sip Traversal Required for
Applications to Work WG (straw) to consider the following document:
- 'DTLS-SRTP Handling in Session Initiation Protocol (SIP) Back-to-Back
   User Agents (B2BUAs)'
  <draft-ietf-straw-b2bua-dtls-srtp-08.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2015-11-10. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.

Abstract


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




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

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


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


