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From: Jen Linkova <furry13@gmail.com>
Date: Tue, 14 Jul 2020 19:53:16 +1000
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To: opsec WG <opsec@ietf.org>
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Subject: [OPSEC] Fwd: OPS ADs Hours
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Dear OpSec participants,

Please find the joint message from our Ops Area Directors, Rob Wilton
and Warren Kumari.

---

Warren and I appreciate that the current COVID situation is tricky for
everyone.  Added to that, I am also a new AD and many of you may not
know me.

Normally at the IETF meetings you have the opportunity to find us
during the week if you have anything informal to discuss, but in the
current climate that isn't so easy.

Hence, if you have something that you would like to discuss with
Warren and I, then we will happily schedule OPS ADs Hours, possibly
during the scheduled IETF 108 week, or at another time if that isn't
practical.

We will only schedule based on any requests that we receive by the end
of next week (Friday 17th July, 23:59 UTC).

Please reply directly back to Warren and I, copying ops-ads, if you
have something that you wish to discuss with us at this time.

Regards,
Rob (and Warren)
---

-- 
SY, Jen Linkova aka Furry


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From: Ron Bonica <rbonica@juniper.net>
To: OPSEC <opsec@ietf.org>
CC: "tls@ietf.org" <tls@ietf.org>
Thread-Topic: Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Archived-At: <https://mailarchive.ietf.org/arch/msg/opsec/iHi_5rqRvXHeMZX_eX1SvlxPAKI>
Subject: [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Folks,

This email begins a Call For Adoption on draft-wang-opsec-tls-proxy-bp<http=
s://datatracker.ietf.org/doc/draft-wang-opsec-tls-proxy-bp/>.

Please send comments to opsec@ietf.org<mailto:opsec@ietf.org> by August 3, =
2020.

                                                                Ron



Juniper Business Use Only

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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Folks,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This email begins a Call For Adoption on <a href=3D"=
https://datatracker.ietf.org/doc/draft-wang-opsec-tls-proxy-bp/">
draft-wang-opsec-tls-proxy-bp</a>.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please send comments to <a href=3D"mailto:opsec@ietf=
.org">opsec@ietf.org</a> by August 3, 2020.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<br>
<p class=3D"msipfooter30b3d538" align=3D"Center" style=3D"margin:0"><span s=
tyle=3D"font-size:7.0pt;font-family:Calibri;color:#000000">Juniper Business=
 Use Only</span></p>
</div>
</body>
</html>

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From: Jen Linkova <furry13@gmail.com>
Date: Thu, 23 Jul 2020 11:30:08 +1000
Message-ID: <CAFU7BAS=ymUPTAGB_fOSrHTG0OajV1n5M1-yOBWxvGam-a89AA@mail.gmail.com>
To: OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
Cc: OpSec Chairs <opsec-chairs@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/opsec/vPMAnjh4YuoYu4mb19ofya1vbEo>
Subject: Re: [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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One thing to add here: the chairs would like to hear active and
explicit support of the adoption. So please speak up if you believe
the draft is useful and the WG shall work on getting it published.

On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica
<rbonica=40juniper.net@dmarc.ietf.org> wrote:
>
> Folks,
>
>
>
> This email begins a Call For Adoption on draft-wang-opsec-tls-proxy-bp.
>
>
>
> Please send comments to opsec@ietf.org by August 3, 2020.
>
>
>
>                                                                 Ron
>
>
>
>
> Juniper Business Use Only
>
> _______________________________________________
> OPSEC mailing list
> OPSEC@ietf.org
> https://www.ietf.org/mailman/listinfo/opsec



--
SY, Jen Linkova aka Furry


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Subject: Re: [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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The Draft gives a good baseline on TLS Proxies and what you should consider.

I support the adoption.

 

Tobias

 

From: OPSEC <opsec-bounces@ietf.org> on behalf of Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>
Date: Sunday, 19. July 2020 at 19:35
To: OPSEC <opsec@ietf.org>
Cc: "tls@ietf.org" <tls@ietf.org>
Subject: [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp

 

Folks,

 

This email begins a Call For Adoption on draft-wang-opsec-tls-proxy-bp.

 

Please send comments to opsec@ietf.org by August 3, 2020.

 

                                                                Ron

 

 

Juniper Business Use Only


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ordSection1><p class=3DMsoNormal><span lang=3DEN-US style=3D'mso-fareast-language:=
EN-US'>The Draft gives a good baseline on TLS Proxies and what you should co=
nsider.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US style=3D'mso-=
fareast-language:EN-US'>I support the adoption.<o:p></o:p></span></p><p clas=
s=3DMsoNormal><span lang=3DEN-US style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;<=
/o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US style=3D'mso-fareast-langu=
age:EN-US'>Tobias<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-f=
areast-language:EN-US'><o:p>&nbsp;</o:p></span></p><div style=3D'border:none;b=
order-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><b><span style=3D'font-size:12.0pt;color:black'>Fro=
m: </span></b><span style=3D'font-size:12.0pt;color:black'>OPSEC &lt;opsec-bou=
nces@ietf.org&gt; on behalf of Ron Bonica &lt;rbonica=3D40juniper.net@dmarc.ie=
tf.org&gt;<br><b>Date: </b>Sunday, 19. July 2020 at 19:35<br><b>To: </b>OPSE=
C &lt;opsec@ietf.org&gt;<br><b>Cc: </b>&quot;tls@ietf.org&quot; &lt;tls@ietf=
.org&gt;<br><b>Subject: </b>[OPSEC] Call For Adoption: draft-wang-opsec-tls-=
proxy-bp<o:p></o:p></span></p></div><div><p class=3DMsoNormal style=3D'margin-le=
ft:36.0pt'><o:p>&nbsp;</o:p></p></div><p class=3DMsoNormal style=3D'margin-left:=
36.0pt'>Folks,<o:p></o:p></p><p class=3DMsoNormal style=3D'margin-left:36.0pt'>&=
nbsp;<o:p></o:p></p><p class=3DMsoNormal style=3D'margin-left:36.0pt'>This email=
 begins a Call For Adoption on <a href=3D"https://datatracker.ietf.org/doc/dra=
ft-wang-opsec-tls-proxy-bp/">draft-wang-opsec-tls-proxy-bp</a>.<o:p></o:p></=
p><p class=3DMsoNormal style=3D'margin-left:36.0pt'>&nbsp;<o:p></o:p></p><p clas=
s=3DMsoNormal style=3D'margin-left:36.0pt'>Please send comments to <a href=3D"mail=
to:opsec@ietf..org">opsec@ietf.org</a> by August 3, 2020.<o:p></o:p></p><p c=
lass=3DMsoNormal style=3D'margin-left:36.0pt'>&nbsp;<o:p></o:p></p><p class=3DMsoN=
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nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
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nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p></o:p></p><p class=3DMsoNormal style=3D'=
margin-left:36.0pt'>&nbsp;<o:p></o:p></p><p class=3DMsoNormal style=3D'margin-le=
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siness Use Only</span><o:p></o:p></p></div></body></html>

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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Message-ID: <d9d6d8c2-3916-be28-d01f-f040a28ce361@cs.tcd.ie>
Date: Sat, 25 Jul 2020 15:07:09 +0100
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Archived-At: <https://mailarchive.ietf.org/arch/msg/opsec/BpuJhL64nvXDaeEEMBk3shCJUQM>
Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
To: Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>,
 "tls@ietf.org" <tls@ietf.org>
Cc: OpSec Chairs <opsec-chairs@ietf.org>
Message-ID: <d9d6d8c2-3916-be28-d01f-f040a28ce361@cs.tcd.ie>
Subject: Re: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
References: <DM6PR05MB634890A51C4AF3CB1A03DA0BAE7A0@DM6PR05MB6348.namprd05.prod.outlook.com>
 <CAFU7BAS=ymUPTAGB_fOSrHTG0OajV1n5M1-yOBWxvGam-a89AA@mail.gmail.com>
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I oppose adoption. While there could be some minor benefit
in documenting the uses and abuses seen when mitm'ing tls,
I doubt that the effort to ensure a balanced document is at
all worthwhile. The current draft is too far from what it'd
need to be to be adopted.

Send to ISE.

S.

On 23/07/2020 02:30, Jen Linkova wrote:
> One thing to add here: the chairs would like to hear active and
> explicit support of the adoption. So please speak up if you believe
> the draft is useful and the WG shall work on getting it published.
>=20
> On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica
> <rbonica=3D40juniper.net@dmarc.ietf.org> wrote:
>>
>> Folks,
>>
>>
>>
>> This email begins a Call For Adoption on draft-wang-opsec-tls-proxy-bp=
=2E
>>
>>
>>
>> Please send comments to opsec@ietf.org by August 3, 2020.
>>
>>
>>
>>                                                                 Ron
>>
>>
>>
>>
>> Juniper Business Use Only
>>
>> _______________________________________________
>> OPSEC mailing list
>> OPSEC@ietf.org
>> https://www.ietf.org/mailman/listinfo/opsec
>=20
>=20
>=20
> --
> SY, Jen Linkova aka Furry
>=20
> _______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls
>=20

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From: "Eric Wang (ejwang)" <ejwang@cisco.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
CC: Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>
Thread-Topic: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
Thread-Index: AdZd8qs4MVhjKcpfSaSC3eC5PK0rEQCniF8AAH8FdoAAUf6sgA==
Date: Mon, 27 Jul 2020 05:14:56 +0000
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--_000_4937FCE423EF45858675C07F3B347AC6ciscocom_--


From nobody Mon Jul 27 05:20:01 2020
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From: "Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
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Thread-Topic: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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I support Stephen and oppose adoption. IMHO, this is not a technology that =
IETF should standardize.


=EF=BB=BFOn 7/25/20, 10:07, "TLS on behalf of Stephen Farrell" <tls-bounces@ietf.=
org on behalf of stephen.farrell@cs.tcd.ie> wrote:


    I oppose adoption. While there could be some minor benefit
    in documenting the uses and abuses seen when mitm'ing tls,
    I doubt that the effort to ensure a balanced document is at
    all worthwhile. The current draft is too far from what it'd
    need to be to be adopted.

    Send to ISE.

    S.

    On 23/07/2020 02:30, Jen Linkova wrote:
    > One thing to add here: the chairs would like to hear active and
    > explicit support of the adoption. So please speak up if you believe
    > the draft is useful and the WG shall work on getting it published.
    >=20
    > On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica
    > <rbonica=3D40juniper.net@dmarc.ietf.org> wrote:
    >>
    >> Folks,
    >>
    >>
    >>
    >> This email begins a Call For Adoption on draft-wang-opsec-tls-proxy-=
bp.
    >>
    >>
    >>
    >> Please send comments to opsec@ietf.org by August 3, 2020.
    >>
    >>
    >>
    >>                                                                 Ron
    >>
    >>
    >>
    >>
    >> Juniper Business Use Only
    >>
    >> _______________________________________________
    >> OPSEC mailing list
    >> OPSEC@ietf.org
    >> https://www.ietf.org/mailman/listinfo/opsec
    >=20
    >=20
    >=20
    > --
    > SY, Jen Linkova aka Furry
    >=20
    > _______________________________________________
    > TLS mailing list
    > TLS@ietf.org
    > https://www.ietf.org/mailman/listinfo/tls
    >=20

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From: Ira McDonald <blueroofmusic@gmail.com>
Date: Mon, 27 Jul 2020 08:26:56 -0400
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To: "Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu>, Ira McDonald <blueroofmusic@gmail.com>
Cc: Stephen Farrell <stephen.farrell@cs.tcd.ie>, Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>,  "tls@ietf.org" <tls@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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I support Stephen and Uri and oppose adoption.

On Mon, Jul 27, 2020 at 8:20 AM Blumenthal, Uri - 0553 - MITLL <
uri@ll.mit.edu> wrote:

> I support Stephen and oppose adoption. IMHO, this is not a technology tha=
t
> IETF should standardize.
>
>
> =EF=BB=BFOn 7/25/20, 10:07, "TLS on behalf of Stephen Farrell" <
> tls-bounces@ietf.org on behalf of stephen.farrell@cs.tcd.ie> wrote:
>
>
>     I oppose adoption. While there could be some minor benefit
>     in documenting the uses and abuses seen when mitm'ing tls,
>     I doubt that the effort to ensure a balanced document is at
>     all worthwhile. The current draft is too far from what it'd
>     need to be to be adopted.
>
>     Send to ISE.
>
>     S.
>
>     On 23/07/2020 02:30, Jen Linkova wrote:
>     > One thing to add here: the chairs would like to hear active and
>     > explicit support of the adoption. So please speak up if you believe
>     > the draft is useful and the WG shall work on getting it published.
>     >
>     > On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica
>     > <rbonica=3D40juniper.net@dmarc.ietf.org> wrote:
>     >>
>     >> Folks,
>     >>
>     >>
>     >>
>     >> This email begins a Call For Adoption on
> draft-wang-opsec-tls-proxy-bp.
>     >>
>     >>
>     >>
>     >> Please send comments to opsec@ietf.org by August 3, 2020.
>     >>
>     >>
>     >>
>     >>                                                                 Ro=
n
>     >>
>     >>
>     >>
>     >>
>     >> Juniper Business Use Only
>     >>
>     >> _______________________________________________
>     >> OPSEC mailing list
>     >> OPSEC@ietf.org
>     >> https://www.ietf.org/mailman/listinfo/opsec
>     >
>     >
>     >
>     > --
>     > SY, Jen Linkova aka Furry
>     >
>     > _______________________________________________
>     > TLS mailing list
>     > TLS@ietf.org
>     > https://www.ietf.org/mailman/listinfo/tls
>     >
> _______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls
>

--00000000000000e5de05ab6b7194
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr"><font size=3D"2">I support Stephen and Uri and oppose adop=
tion.</font><br></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Mon, Jul 27, 2020 at 8:20 AM Blumenthal, Uri - 0553 - MI=
TLL &lt;<a href=3D"mailto:uri@ll.mit.edu">uri@ll.mit.edu</a>&gt; wrote:<br>=
</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex">I support Stephen a=
nd oppose adoption. IMHO, this is not a technology that IETF should standar=
dize.<br>
<br>
<br>
=EF=BB=BFOn 7/25/20, 10:07, &quot;TLS on behalf of Stephen Farrell&quot; &l=
t;<a href=3D"mailto:tls-bounces@ietf.org" target=3D"_blank">tls-bounces@iet=
f.org</a> on behalf of <a href=3D"mailto:stephen.farrell@cs.tcd.ie" target=
=3D"_blank">stephen.farrell@cs.tcd.ie</a>&gt; wrote:<br>
<br>
<br>
=C2=A0 =C2=A0 I oppose adoption. While there could be some minor benefit<br=
>
=C2=A0 =C2=A0 in documenting the uses and abuses seen when mitm&#39;ing tls=
,<br>
=C2=A0 =C2=A0 I doubt that the effort to ensure a balanced document is at<b=
r>
=C2=A0 =C2=A0 all worthwhile. The current draft is too far from what it&#39=
;d<br>
=C2=A0 =C2=A0 need to be to be adopted.<br>
<br>
=C2=A0 =C2=A0 Send to ISE.<br>
<br>
=C2=A0 =C2=A0 S.<br>
<br>
=C2=A0 =C2=A0 On 23/07/2020 02:30, Jen Linkova wrote:<br>
=C2=A0 =C2=A0 &gt; One thing to add here: the chairs would like to hear act=
ive and<br>
=C2=A0 =C2=A0 &gt; explicit support of the adoption. So please speak up if =
you believe<br>
=C2=A0 =C2=A0 &gt; the draft is useful and the WG shall work on getting it =
published.<br>
=C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 &gt; On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica<br>
=C2=A0 =C2=A0 &gt; &lt;rbonica=3D<a href=3D"mailto:40juniper.net@dmarc.ietf=
.org" target=3D"_blank">40juniper.net@dmarc.ietf.org</a>&gt; wrote:<br>
=C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 &gt;&gt; Folks,<br>
=C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 &gt;&gt; This email begins a Call For Adoption on draft-wang-=
opsec-tls-proxy-bp.<br>
=C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 &gt;&gt; Please send comments to <a href=3D"mailto:opsec@ietf=
.org" target=3D"_blank">opsec@ietf.org</a> by August 3, 2020.<br>
=C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 &gt;&gt;<br>
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=C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 &gt;&gt; Juniper Business Use Only<br>
=C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 &gt;&gt; _______________________________________________<br>
=C2=A0 =C2=A0 &gt;&gt; OPSEC mailing list<br>
=C2=A0 =C2=A0 &gt;&gt; <a href=3D"mailto:OPSEC@ietf.org" target=3D"_blank">=
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=C2=A0 =C2=A0 &gt;&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/ops=
ec" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/mailman/listi=
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=C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 &gt; --<br>
=C2=A0 =C2=A0 &gt; SY, Jen Linkova aka Furry<br>
=C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 &gt; _______________________________________________<br>
=C2=A0 =C2=A0 &gt; TLS mailing list<br>
=C2=A0 =C2=A0 &gt; <a href=3D"mailto:TLS@ietf.org" target=3D"_blank">TLS@ie=
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=C2=A0 =C2=A0 &gt; <a href=3D"https://www.ietf.org/mailman/listinfo/tls" re=
l=3D"noreferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/tl=
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=C2=A0 =C2=A0 &gt; <br>
_______________________________________________<br>
TLS mailing list<br>
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<a href=3D"https://www.ietf.org/mailman/listinfo/tls" rel=3D"noreferrer" ta=
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</blockquote></div>

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From: "Salz, Rich" <rsalz@akamai.com>
To: Ira McDonald <blueroofmusic@gmail.com>, "Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu>
CC: "tls@ietf.org" <tls@ietf.org>, Jen Linkova <furry13@gmail.com>, "OpSec Chairs" <opsec-chairs@ietf.org>, OPSEC <opsec@ietf.org>
Thread-Topic: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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To: "Salz, Rich" <rsalz=40akamai.com@dmarc.ietf.org>, Ira McDonald <blueroofmusic@gmail.com>, "Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu>
Cc: Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>, "tls@ietf.org" <tls@ietf.org>
References: <DM6PR05MB634890A51C4AF3CB1A03DA0BAE7A0@DM6PR05MB6348.namprd05.prod.outlook.com> <CAFU7BAS=ymUPTAGB_fOSrHTG0OajV1n5M1-yOBWxvGam-a89AA@mail.gmail.com> <d9d6d8c2-3916-be28-d01f-f040a28ce361@cs.tcd.ie> <9F2FDA20-12AA-4523-905D-7C9380B7A390@ll.mit.edu> <CAN40gSvq4_g10EvsReRLgxrqqfXVp_A-XB90T8rDVTTZ0=rV-w@mail.gmail.com> <411590AE-EEA6-41EE-B0C8-CC1E0C05F1CE@akamai.com>
From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Message-ID: <c1a13b81-666c-9e35-b611-ee00b3fcae1e@cs.tcd.ie>
Date: Mon, 27 Jul 2020 13:55:02 +0100
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Archived-At: <https://mailarchive.ietf.org/arch/msg/opsec/EASXvXJWwr7rnXys9D3FFuyoueQ>
Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
To: "Salz, Rich" <rsalz=40akamai.com@dmarc.ietf.org>,
 Ira McDonald <blueroofmusic@gmail.com>,
 "Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu>
Cc: Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>,
 OpSec Chairs <opsec-chairs@ietf.org>, "tls@ietf.org" <tls@ietf.org>
Message-ID: <c1a13b81-666c-9e35-b611-ee00b3fcae1e@cs.tcd.ie>
Subject: Re: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
References: <DM6PR05MB634890A51C4AF3CB1A03DA0BAE7A0@DM6PR05MB6348.namprd05.prod.outlook.com>
 <CAFU7BAS=ymUPTAGB_fOSrHTG0OajV1n5M1-yOBWxvGam-a89AA@mail.gmail.com>
 <d9d6d8c2-3916-be28-d01f-f040a28ce361@cs.tcd.ie>
 <9F2FDA20-12AA-4523-905D-7C9380B7A390@ll.mit.edu>
 <CAN40gSvq4_g10EvsReRLgxrqqfXVp_A-XB90T8rDVTTZ0=rV-w@mail.gmail.com>
 <411590AE-EEA6-41EE-B0C8-CC1E0C05F1CE@akamai.com>
In-Reply-To: <411590AE-EEA6-41EE-B0C8-CC1E0C05F1CE@akamai.com>

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Hi Rich,

On 27/07/2020 13:37, Salz, Rich wrote:
> Not adopting this seems to be ignoring reality.=20

That depends on the "this" though. This "this" seems
to me to be very much ok with mitm'ing, while doing
a little bit to recognise the downsides of mitm'ing.
I'm not objecting to attempts to describe reality,
but am rather arguing that achieving rough consensus
on something starting from that "this" is not worth
the effort, as we've I think seem demonstrated a
couple of time recently.

Cheers,
S.

> There are places
> which use TLS intermediaries. Are those users not welcome here?
>=20
> I support adoption.
>=20
>=20
> _______________________________________________ TLS mailing list=20
> TLS@ietf.org https://www.ietf.org/mailman/listinfo/tls
>=20

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From: "Nancy Cam-Winget (ncamwing)" <ncamwing@cisco.com>
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From: "Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu>
To: "Nancy Cam-Winget (ncamwing)" <ncamwing@cisco.com>, Stephen Farrell <stephen.farrell@cs.tcd.ie>, Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
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Thread-Topic: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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--B_3678686295_1733652896
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	charset="UTF-8"
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Nancy,

Understood. However, in this particular case, instead of "if you want to do=
 this, then do it that way, and I'll help you inter-operate" I prefer "if yo=
u want to do this - you're on your own, don't seek a blessing or advice from=
 me".

Regards,
Uri

=EF=BB=BFOn 7/27/20, 08:56, "Nancy Cam-Winget (ncamwing)" <ncamwing@cisco.com> wr=
ote:

    The document is not imposing any standards but rather provide guideline=
s for those implementing TLS proxies;  given that proxies will continue to e=
xist I'm not sure why there is a belief that the IETF should ignore this.

    Warm regards, Nancy

    On 7/27/20, 5:20 AM, "OPSEC on behalf of Blumenthal, Uri - 0553 - MITLL=
" <opsec-bounces@ietf.org on behalf of uri@ll.mit.edu> wrote:

        I support Stephen and oppose adoption. IMHO, this is not a technolo=
gy that IETF should standardize.


        On 7/25/20, 10:07, "TLS on behalf of Stephen Farrell" <tls-bounces@=
ietf.org on behalf of stephen.farrell@cs.tcd.ie> wrote:


            I oppose adoption. While there could be some minor benefit
            in documenting the uses and abuses seen when mitm'ing tls,
            I doubt that the effort to ensure a balanced document is at
            all worthwhile. The current draft is too far from what it'd
            need to be to be adopted.

            Send to ISE.

            S.

            On 23/07/2020 02:30, Jen Linkova wrote:
            > One thing to add here: the chairs would like to hear active a=
nd
            > explicit support of the adoption. So please speak up if you b=
elieve
            > the draft is useful and the WG shall work on getting it publi=
shed.
            >=20
            > On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica
            > <rbonica=3D40juniper.net@dmarc.ietf.org> wrote:
            >>
            >> Folks,
            >>
            >>
            >>
            >> This email begins a Call For Adoption on draft-wang-opsec-tl=
s-proxy-bp.
            >>
            >>
            >>
            >> Please send comments to opsec@ietf.org by August 3, 2020.
            >>
            >>
            >>
            >>                                                             =
    Ron
            >>
            >>
            >>
            >>
            >> Juniper Business Use Only
            >>
            >> _______________________________________________
            >> OPSEC mailing list
            >> OPSEC@ietf.org
            >> https://www.ietf.org/mailman/listinfo/opsec
            >=20
            >=20
            >=20
            > --
            > SY, Jen Linkova aka Furry
            >=20
            > _______________________________________________
            > TLS mailing list
            > TLS@ietf.org
            > https://www.ietf.org/mailman/listinfo/tls
            >=20



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From: Ben Schwartz <bemasc@google.com>
Date: Mon, 27 Jul 2020 09:30:35 -0400
Message-ID: <CAHbrMsC6AL=CrpponmJaab4DijY=mgqbUN6YFaC8eHYf-aeORQ@mail.gmail.com>
To: "Nancy Cam-Winget (ncamwing)" <ncamwing=40cisco.com@dmarc.ietf.org>
Cc: "Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu>, Stephen Farrell <stephen.farrell@cs.tcd.ie>,  Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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I'm concerned about this work happening outside the TLS working group.  For
example, the question of proper handling of TLS extensions is not addressed
at all in this draft, and has significant security and functionality
implications.  There are various other tricky protocol issues (e.g. version
negotiation, TLS 1.3 record padding, TLS 1.3 0-RTT vs. TLS 1.2 False Start,
round-trip deadlock when buffers fill, ticket (non-)reuse, client
certificate linkability pre-TLS-1.3, implications of SAN scope of
synthesized certificates) that could arise and are going to be difficult to
get right in any other WG.

The title "TLS Proxy Best Practice" implies that it is possible to proxy
TLS correctly, and that this document is the main source for how to do it.
I think the TLS WG is the right place to make those judgments.  For the
OpSec group, I think a more appropriate draft would be something like "TLS
Interception Pitfalls", documenting the operational experience on failure
modes of TLS interception.

On Mon, Jul 27, 2020 at 8:57 AM Nancy Cam-Winget (ncamwing) <ncamwing=3D
40cisco.com@dmarc.ietf.org> wrote:

> The document is not imposing any standards but rather provide guidelines
> for those implementing TLS proxies;  given that proxies will continue to
> exist I'm not sure why there is a belief that the IETF should ignore this=
.
>
> Warm regards, Nancy
>
> =EF=BB=BFOn 7/27/20, 5:20 AM, "OPSEC on behalf of Blumenthal, Uri - 0553 =
- MITLL" <
> opsec-bounces@ietf.org on behalf of uri@ll.mit.edu> wrote:
>
>     I support Stephen and oppose adoption. IMHO, this is not a technology
> that IETF should standardize.
>
>
>     On 7/25/20, 10:07, "TLS on behalf of Stephen Farrell" <
> tls-bounces@ietf.org on behalf of stephen.farrell@cs.tcd.ie> wrote:
>
>
>         I oppose adoption. While there could be some minor benefit
>         in documenting the uses and abuses seen when mitm'ing tls,
>         I doubt that the effort to ensure a balanced document is at
>         all worthwhile. The current draft is too far from what it'd
>         need to be to be adopted.
>
>         Send to ISE.
>
>         S.
>
>         On 23/07/2020 02:30, Jen Linkova wrote:
>         > One thing to add here: the chairs would like to hear active and
>         > explicit support of the adoption. So please speak up if you
> believe
>         > the draft is useful and the WG shall work on getting it
> published.
>         >
>         > On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica
>         > <rbonica=3D40juniper.net@dmarc.ietf.org> wrote:
>         >>
>         >> Folks,
>         >>
>         >>
>         >>
>         >> This email begins a Call For Adoption on
> draft-wang-opsec-tls-proxy-bp.
>         >>
>         >>
>         >>
>         >> Please send comments to opsec@ietf.org by August 3, 2020.
>         >>
>         >>
>         >>
>         >>
>  Ron
>         >>
>         >>
>         >>
>         >>
>         >> Juniper Business Use Only
>         >>
>         >> _______________________________________________
>         >> OPSEC mailing list
>         >> OPSEC@ietf.org
>         >> https://www.ietf.org/mailman/listinfo/opsec
>         >
>         >
>         >
>         > --
>         > SY, Jen Linkova aka Furry
>         >
>         > _______________________________________________
>         > TLS mailing list
>         > TLS@ietf.org
>         > https://www.ietf.org/mailman/listinfo/tls
>         >
>
>
> _______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls
>

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<div dir=3D"ltr"><div dir=3D"ltr">I&#39;m concerned about this work happeni=
ng outside the TLS working group.=C2=A0 For example, the question of proper=
 handling of TLS extensions is not addressed at all in this draft, and has =
significant security and functionality implications.=C2=A0 There are variou=
s other tricky protocol issues (e.g. version negotiation, TLS 1.3 record pa=
dding, TLS 1.3 0-RTT vs. TLS 1.2 False Start, round-trip deadlock when buff=
ers fill, ticket (non-)reuse, client certificate linkability pre-TLS-1.3, i=
mplications of SAN scope of synthesized certificates) that could arise and =
are going to be difficult to get right in any other WG.<div><br></div><div>=
The title &quot;TLS Proxy Best Practice&quot; implies that it is possible t=
o proxy TLS correctly, and that this document is the main source for how to=
 do it.=C2=A0 I think the TLS WG is the right place to make those judgments=
.=C2=A0 For the OpSec group, I think a more=C2=A0appropriate draft would=C2=
=A0be something like &quot;TLS Interception Pitfalls&quot;, documenting the=
 operational experience on failure modes of TLS interception.</div></div><b=
r><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, =
Jul 27, 2020 at 8:57 AM Nancy Cam-Winget (ncamwing) &lt;ncamwing=3D<a href=
=3D"mailto:40cisco.com@dmarc.ietf.org">40cisco.com@dmarc.ietf.org</a>&gt; w=
rote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0p=
x 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">The docume=
nt is not imposing any standards but rather provide guidelines for those im=
plementing TLS proxies;=C2=A0 given that proxies will continue to exist I&#=
39;m not sure why there is a belief that the IETF should ignore this.<br>
<br>
Warm regards, Nancy<br>
<br>
=EF=BB=BFOn 7/27/20, 5:20 AM, &quot;OPSEC on behalf of Blumenthal, Uri - 05=
53 - MITLL&quot; &lt;<a href=3D"mailto:opsec-bounces@ietf.org" target=3D"_b=
lank">opsec-bounces@ietf.org</a> on behalf of <a href=3D"mailto:uri@ll.mit.=
edu" target=3D"_blank">uri@ll.mit.edu</a>&gt; wrote:<br>
<br>
=C2=A0 =C2=A0 I support Stephen and oppose adoption. IMHO, this is not a te=
chnology that IETF should standardize.<br>
<br>
<br>
=C2=A0 =C2=A0 On 7/25/20, 10:07, &quot;TLS on behalf of Stephen Farrell&quo=
t; &lt;<a href=3D"mailto:tls-bounces@ietf.org" target=3D"_blank">tls-bounce=
s@ietf.org</a> on behalf of <a href=3D"mailto:stephen.farrell@cs.tcd.ie" ta=
rget=3D"_blank">stephen.farrell@cs.tcd.ie</a>&gt; wrote:<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 I oppose adoption. While there could be some mi=
nor benefit<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 in documenting the uses and abuses seen when mi=
tm&#39;ing tls,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 I doubt that the effort to ensure a balanced do=
cument is at<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 all worthwhile. The current draft is too far fr=
om what it&#39;d<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 need to be to be adopted.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Send to ISE.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 S.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 On 23/07/2020 02:30, Jen Linkova wrote:<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; One thing to add here: the chairs would li=
ke to hear active and<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; explicit support of the adoption. So pleas=
e speak up if you believe<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; the draft is useful and the WG shall work =
on getting it published.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica=
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; &lt;rbonica=3D<a href=3D"mailto:40juniper.=
net@dmarc.ietf.org" target=3D"_blank">40juniper.net@dmarc.ietf.org</a>&gt; =
wrote:<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; Folks,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; This email begins a Call For Adoption =
on draft-wang-opsec-tls-proxy-bp.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; Please send comments to <a href=3D"mai=
lto:opsec@ietf.org" target=3D"_blank">opsec@ietf.org</a> by August 3, 2020.=
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ron<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; Juniper Business Use Only<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; ______________________________________=
_________<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; OPSEC mailing list<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; <a href=3D"mailto:OPSEC@ietf.org" targ=
et=3D"_blank">OPSEC@ietf.org</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; <a href=3D"https://www.ietf.org/mailma=
n/listinfo/opsec" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org=
/mailman/listinfo/opsec</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; --<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; SY, Jen Linkova aka Furry<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; __________________________________________=
_____<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; TLS mailing list<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <a href=3D"mailto:TLS@ietf.org" target=3D"=
_blank">TLS@ietf.org</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <a href=3D"https://www.ietf.org/mailman/li=
stinfo/tls" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/mailm=
an/listinfo/tls</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
<br>
<br>
_______________________________________________<br>
TLS mailing list<br>
<a href=3D"mailto:TLS@ietf.org" target=3D"_blank">TLS@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/tls" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/tls</a><br>
</blockquote></div></div>

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From: Nick Harper <nharper@google.com>
Date: Mon, 27 Jul 2020 07:11:55 -0700
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To: Ben Schwartz <bemasc=40google.com@dmarc.ietf.org>
Cc: "Nancy Cam-Winget (ncamwing)" <ncamwing=40cisco.com@dmarc.ietf.org>, Jen Linkova <furry13@gmail.com>,  OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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As currently written, this draft has multiple problems.

Section 4 decides not to repeat the Protocol Invariants described in
section 9.3 of RFC 8446. However, further sections are written assuming
that a proxy acts in a way contrary to those Protocol Invariants. One such
example is section 4.2 in this draft. It describes how a proxy might
generate its list of cipher suites by modifying the client's list. A proxy
that copies the cipher suites from the client-initiated ClientHello into
its own ClientHello is violating the 1st and 3rd points of the TLS 1.3
Protocol Invariants. For a best practices document, I think it would be
reasonable to reiterate the Protocol Invariants.

In addition to reiterating the Protocol Invariants, it should also
summarize the advice from the cited papers SECURITY_IMPACT and
APPLIANCE_ANALYSIS. One of the problems pointed out by those papers is that
TLS proxies will make connections to a server that presents a certificate
the client wouldn't accept, but because of the proxy, the client isn't
aware of the certificate issues. I don't see this issue addressed at all in
the draft. (A similar issue with the server selecting a weak cipher suite
is possibly implied by section 4.2, but it is not spelled out well.)

If this draft is adopted, it needs to say the following things, which it
currently doesn't.

- When a TLS proxy generates its ClientHello, it should be created
independently from the client-initiated ClientHello. The proxy MAY choose
to omit fields from its ClientHello based on the client-initiated
ClientHello, but it MUST NOT add fields to its ClientHello based on the
client-initiated ClientHello. This is effectively a restatement of the 1st
(a client MUST support all parameters it sends) and 3rd (it MUST generate
its own ClientHello containing only parameters it understands) points of
the TLS 1.3 Protocol Invariants.

- If a proxy chooses to conditionally proxy TLS connections and needs more
information than what is contained in the client-initiated ClientHello,
then the only way to make that decision is to send its own ClientHello to
the server the client is connecting to and use information observed on that
connection to make the decision to proxy the pending connection.

- If a proxy chooses to not proxy some TLS connections, the proxy will fail
open. The only way to avoid failing open is to proxy all connections.

On Mon, Jul 27, 2020 at 6:31 AM Ben Schwartz <bemasc=3D
40google.com@dmarc.ietf.org> wrote:

> I'm concerned about this work happening outside the TLS working group.
> For example, the question of proper handling of TLS extensions is not
> addressed at all in this draft, and has significant security and
> functionality implications.  There are various other tricky protocol issu=
es
> (e.g. version negotiation, TLS 1.3 record padding, TLS 1.3 0-RTT vs. TLS
> 1.2 False Start, round-trip deadlock when buffers fill, ticket (non-)reus=
e,
> client certificate linkability pre-TLS-1.3, implications of SAN scope of
> synthesized certificates) that could arise and are going to be difficult =
to
> get right in any other WG.
>
> The title "TLS Proxy Best Practice" implies that it is possible to proxy
> TLS correctly, and that this document is the main source for how to do it=
.
> I think the TLS WG is the right place to make those judgments..  For the
> OpSec group, I think a more appropriate draft would be something like "TL=
S
> Interception Pitfalls", documenting the operational experience on failure
> modes of TLS interception.
>
> On Mon, Jul 27, 2020 at 8:57 AM Nancy Cam-Winget (ncamwing) <ncamwing=3D
> 40cisco.com@dmarc.ietf.org> wrote:
>
>> The document is not imposing any standards but rather provide guidelines
>> for those implementing TLS proxies;  given that proxies will continue to
>> exist I'm not sure why there is a belief that the IETF should ignore thi=
s.
>>
>> Warm regards, Nancy
>>
>> =EF=BB=BFOn 7/27/20, 5:20 AM, "OPSEC on behalf of Blumenthal, Uri - 0553=
 - MITLL"
>> <opsec-bounces@ietf.org on behalf of uri@ll.mit.edu> wrote:
>>
>>     I support Stephen and oppose adoption. IMHO, this is not a technolog=
y
>> that IETF should standardize.
>>
>>
>>     On 7/25/20, 10:07, "TLS on behalf of Stephen Farrell" <
>> tls-bounces@ietf.org on behalf of stephen.farrell@cs.tcd.ie> wrote:
>>
>>
>>         I oppose adoption. While there could be some minor benefit
>>         in documenting the uses and abuses seen when mitm'ing tls,
>>         I doubt that the effort to ensure a balanced document is at
>>         all worthwhile. The current draft is too far from what it'd
>>         need to be to be adopted.
>>
>>         Send to ISE.
>>
>>         S.
>>
>>         On 23/07/2020 02:30, Jen Linkova wrote:
>>         > One thing to add here: the chairs would like to hear active an=
d
>>         > explicit support of the adoption. So please speak up if you
>> believe
>>         > the draft is useful and the WG shall work on getting it
>> published.
>>         >
>>         > On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica
>>         > <rbonica=3D40juniper.net@dmarc.ietf.org> wrote:
>>         >>
>>         >> Folks,
>>         >>
>>         >>
>>         >>
>>         >> This email begins a Call For Adoption on
>> draft-wang-opsec-tls-proxy-bp.
>>         >>
>>         >>
>>         >>
>>         >> Please send comments to opsec@ietf.org by August 3, 2020.
>>         >>
>>         >>
>>         >>
>>         >>
>>  Ron
>>         >>
>>         >>
>>         >>
>>         >>
>>         >> Juniper Business Use Only
>>         >>
>>         >> _______________________________________________
>>         >> OPSEC mailing list
>>         >> OPSEC@ietf.org
>>         >> https://www.ietf.org/mailman/listinfo/opsec
>>         >
>>         >
>>         >
>>         > --
>>         > SY, Jen Linkova aka Furry
>>         >
>>         > _______________________________________________
>>         > TLS mailing list
>>         > TLS@ietf.org
>>         > https://www.ietf.org/mailman/listinfo/tls
>>         >
>>
>>
>> _______________________________________________
>> TLS mailing list
>> TLS@ietf.org
>> https://www.ietf.org/mailman/listinfo/tls
>>
> _______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls
>

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Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr">As currently written, this draft has multiple problems.<di=
v><br></div><div>Section 4 decides not to repeat the Protocol Invariants de=
scribed in section 9.3 of RFC 8446. However, further sections are written a=
ssuming that a proxy acts in a way contrary to those Protocol Invariants. O=
ne such example is section 4.2 in this draft. It describes how a proxy migh=
t generate its list of cipher suites by modifying the client&#39;s list. A =
proxy that copies the cipher suites from the client-initiated ClientHello i=
nto its own ClientHello is violating the 1st and 3rd points of the TLS 1.3 =
Protocol Invariants. For a best practices document, I think it would be rea=
sonable to reiterate the Protocol Invariants.</div><div><br></div><div>In a=
ddition to reiterating the Protocol Invariants, it should also summarize th=
e advice from the cited papers SECURITY_IMPACT and APPLIANCE_ANALYSIS. One =
of the problems pointed out by those papers is that TLS proxies will make c=
onnections to a server that presents a certificate the client wouldn&#39;t =
accept, but because of the proxy, the client isn&#39;t aware of the certifi=
cate issues. I don&#39;t see this issue addressed at all in the draft. (A s=
imilar issue with the server selecting a weak cipher suite is possibly impl=
ied by section 4.2, but it is not spelled out well.)</div><div><br></div><d=
iv>If this draft is adopted, it needs to say the following things, which it=
 currently doesn&#39;t.</div><div><br></div><div>- When a TLS proxy generat=
es its ClientHello, it should be created independently from the client-init=
iated ClientHello. The proxy MAY choose to omit fields from its ClientHello=
 based on the client-initiated ClientHello, but it MUST NOT add fields to i=
ts ClientHello based on the client-initiated ClientHello. This is effective=
ly a restatement of the 1st (a client MUST support all parameters it sends)=
 and 3rd (it MUST generate its own ClientHello containing only parameters i=
t understands) points of the TLS 1.3 Protocol Invariants.</div><div><br></d=
iv><div>- If a proxy chooses to conditionally proxy TLS connections and nee=
ds more information than what is contained in the client-initiated ClientHe=
llo, then the only way to make that decision is to send its own ClientHello=
 to the server the client is connecting to and use information observed on =
that connection to make the decision to proxy the pending connection.</div>=
<div><br></div><div>- If a proxy chooses to not proxy some TLS connections,=
 the proxy will fail open. The only way to avoid failing open is to proxy a=
ll connections.</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Mon, Jul 27, 2020 at 6:31 AM Ben Schwartz &lt;bemas=
c=3D<a href=3D"mailto:40google.com@dmarc.ietf.org">40google.com@dmarc.ietf.=
org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"marg=
in:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1e=
x"><div dir=3D"ltr"><div dir=3D"ltr">I&#39;m concerned about this work happ=
ening outside the TLS working group.=C2=A0 For example, the question of pro=
per handling of TLS extensions is not addressed at all in this draft, and h=
as significant security and functionality implications.=C2=A0 There are var=
ious other tricky protocol issues (e.g. version negotiation, TLS 1.3 record=
 padding, TLS 1.3 0-RTT vs. TLS 1.2 False Start, round-trip deadlock when b=
uffers fill, ticket (non-)reuse, client certificate linkability pre-TLS-1.3=
, implications of SAN scope of synthesized certificates) that could arise a=
nd are going to be difficult to get right in any other WG.<div><br></div><d=
iv>The title &quot;TLS Proxy Best Practice&quot; implies that it is possibl=
e to proxy TLS correctly, and that this document is the main source for how=
 to do it.=C2=A0 I think the TLS WG is the right place to make those judgme=
nts..=C2=A0 For the OpSec group, I think a more=C2=A0appropriate draft woul=
d=C2=A0be something like &quot;TLS Interception Pitfalls&quot;, documenting=
 the operational experience on failure modes of TLS interception.</div></di=
v><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On M=
on, Jul 27, 2020 at 8:57 AM Nancy Cam-Winget (ncamwing) &lt;ncamwing=3D<a h=
ref=3D"mailto:40cisco.com@dmarc.ietf.org" target=3D"_blank">40cisco.com@dma=
rc.ietf.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex">The document is not imposing any standards but rather provide gu=
idelines for those implementing TLS proxies;=C2=A0 given that proxies will =
continue to exist I&#39;m not sure why there is a belief that the IETF shou=
ld ignore this.<br>
<br>
Warm regards, Nancy<br>
<br>
=EF=BB=BFOn 7/27/20, 5:20 AM, &quot;OPSEC on behalf of Blumenthal, Uri - 05=
53 - MITLL&quot; &lt;<a href=3D"mailto:opsec-bounces@ietf.org" target=3D"_b=
lank">opsec-bounces@ietf.org</a> on behalf of <a href=3D"mailto:uri@ll.mit.=
edu" target=3D"_blank">uri@ll.mit.edu</a>&gt; wrote:<br>
<br>
=C2=A0 =C2=A0 I support Stephen and oppose adoption. IMHO, this is not a te=
chnology that IETF should standardize.<br>
<br>
<br>
=C2=A0 =C2=A0 On 7/25/20, 10:07, &quot;TLS on behalf of Stephen Farrell&quo=
t; &lt;<a href=3D"mailto:tls-bounces@ietf.org" target=3D"_blank">tls-bounce=
s@ietf.org</a> on behalf of <a href=3D"mailto:stephen.farrell@cs.tcd.ie" ta=
rget=3D"_blank">stephen.farrell@cs.tcd.ie</a>&gt; wrote:<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 I oppose adoption. While there could be some mi=
nor benefit<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 in documenting the uses and abuses seen when mi=
tm&#39;ing tls,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 I doubt that the effort to ensure a balanced do=
cument is at<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 all worthwhile. The current draft is too far fr=
om what it&#39;d<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 need to be to be adopted.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Send to ISE.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 S.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 On 23/07/2020 02:30, Jen Linkova wrote:<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; One thing to add here: the chairs would li=
ke to hear active and<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; explicit support of the adoption. So pleas=
e speak up if you believe<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; the draft is useful and the WG shall work =
on getting it published.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica=
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; &lt;rbonica=3D<a href=3D"mailto:40juniper.=
net@dmarc.ietf.org" target=3D"_blank">40juniper.net@dmarc.ietf.org</a>&gt; =
wrote:<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; Folks,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; This email begins a Call For Adoption =
on draft-wang-opsec-tls-proxy-bp.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; Please send comments to <a href=3D"mai=
lto:opsec@ietf.org" target=3D"_blank">opsec@ietf.org</a> by August 3, 2020.=
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ron<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; Juniper Business Use Only<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; ______________________________________=
_________<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; OPSEC mailing list<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; <a href=3D"mailto:OPSEC@ietf.org" targ=
et=3D"_blank">OPSEC@ietf.org</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt;&gt; <a href=3D"https://www.ietf.org/mailma=
n/listinfo/opsec" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org=
/mailman/listinfo/opsec</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; --<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; SY, Jen Linkova aka Furry<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; __________________________________________=
_____<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; TLS mailing list<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <a href=3D"mailto:TLS@ietf.org" target=3D"=
_blank">TLS@ietf.org</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <a href=3D"https://www.ietf.org/mailman/li=
stinfo/tls" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/mailm=
an/listinfo/tls</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
<br>
<br>
_______________________________________________<br>
TLS mailing list<br>
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From: "Salz, Rich" <rsalz@akamai.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
CC: OpSec Chairs <opsec-chairs@ietf.org>
Thread-Topic: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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--B_3678690659_1181152928
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As my personal opinion - both.


=EF=BB=BFOn 7/27/20, 10:22, "TLS on behalf of Salz, Rich" <tls-bounces@ietf.org o=
n behalf of rsalz=3D40akamai.com@dmarc.ietf.org> wrote:

    >    Understood. However, in this particular case, instead of "if you w=
ant to do this, then do it that way, and I'll help you inter-operate" I pref=
er "if you want to do this - you're on your own, don't seek a blessing or ad=
vice from me".

    So you don't feel that community is welcome here at the IETF, or that y=
ou won't personally participate?


    _______________________________________________
    TLS mailing list
    TLS@ietf.org
    https://www.ietf.org/mailman/listinfo/tls

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From: Andrei Popov <Andrei.Popov@microsoft.com>
To: Nick Harper <nharper=40google.com@dmarc.ietf.org>, Ben Schwartz <bemasc=40google.com@dmarc.ietf.org>
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From: Roelof duToit <r@nerd.ninja>
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Date: Mon, 27 Jul 2020 15:09:59 -0400
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Cc: Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>
To: Ben Schwartz <bemasc=40google.com@dmarc.ietf.org>
References: <DM6PR05MB634890A51C4AF3CB1A03DA0BAE7A0@DM6PR05MB6348.namprd05.prod.outlook.com> <CAFU7BAS=ymUPTAGB_fOSrHTG0OajV1n5M1-yOBWxvGam-a89AA@mail.gmail.com> <d9d6d8c2-3916-be28-d01f-f040a28ce361@cs.tcd.ie> <9F2FDA20-12AA-4523-905D-7C9380B7A390@ll.mit.edu> <43A56381-0BA8-4123-A2D5-950FD1EDFC86@cisco.com> <CAHbrMsC6AL=CrpponmJaab4DijY=mgqbUN6YFaC8eHYf-aeORQ@mail.gmail.com>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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As co-author I support adoption of the draft and appreciate the =
feedback.

The authors agreed at the time that the OPSEC WG charter would better =
match our intention of documenting the BCP for TLS proxies given that =
the TLS WG charter places more of an emphasis on the TLS protocol.  =
Having said that, we do also agree that the TLS WG should be involved.  =
The recommendation from the TLS WG chairs was to continue in OPSEC and =
to cc the TLS WG.

--Roelof


> On Jul 27, 2020, at 9:30 AM, Ben Schwartz =
<bemasc=3D40google.com@dmarc.ietf.org> wrote:
>=20
> I'm concerned about this work happening outside the TLS working group. =
 For example, the question of proper handling of TLS extensions is not =
addressed at all in this draft, and has significant security and =
functionality implications.  There are various other tricky protocol =
issues (e.g. version negotiation, TLS 1.3 record padding, TLS 1.3 0-RTT =
vs. TLS 1.2 False Start, round-trip deadlock when buffers fill, ticket =
(non-)reuse, client certificate linkability pre-TLS-1.3, implications of =
SAN scope of synthesized certificates) that could arise and are going to =
be difficult to get right in any other WG.
>=20
> The title "TLS Proxy Best Practice" implies that it is possible to =
proxy TLS correctly, and that this document is the main source for how =
to do it.  I think the TLS WG is the right place to make those =
judgments..  For the OpSec group, I think a more appropriate draft would =
be something like "TLS Interception Pitfalls", documenting the =
operational experience on failure modes of TLS interception.
>=20
> On Mon, Jul 27, 2020 at 8:57 AM Nancy Cam-Winget (ncamwing) =
<ncamwing=3D40cisco.com@dmarc.ietf.org =
<mailto:40cisco.com@dmarc.ietf.org>> wrote:
> The document is not imposing any standards but rather provide =
guidelines for those implementing TLS proxies;  given that proxies will =
continue to exist I'm not sure why there is a belief that the IETF =
should ignore this.
>=20
> Warm regards, Nancy
>=20
> =EF=BB=BFOn 7/27/20, 5:20 AM, "OPSEC on behalf of Blumenthal, Uri - =
0553 - MITLL" <opsec-bounces@ietf.org <mailto:opsec-bounces@ietf.org> on =
behalf of uri@ll.mit.edu <mailto:uri@ll.mit.edu>> wrote:
>=20
>     I support Stephen and oppose adoption. IMHO, this is not a =
technology that IETF should standardize.
>=20
>=20
>     On 7/25/20, 10:07, "TLS on behalf of Stephen Farrell" =
<tls-bounces@ietf.org <mailto:tls-bounces@ietf.org> on behalf of =
stephen.farrell@cs.tcd.ie <mailto:stephen.farrell@cs.tcd.ie>> wrote:
>=20
>=20
>         I oppose adoption. While there could be some minor benefit
>         in documenting the uses and abuses seen when mitm'ing tls,
>         I doubt that the effort to ensure a balanced document is at
>         all worthwhile. The current draft is too far from what it'd
>         need to be to be adopted.
>=20
>         Send to ISE.
>=20
>         S.
>=20
>         On 23/07/2020 02:30, Jen Linkova wrote:
>         > One thing to add here: the chairs would like to hear active =
and
>         > explicit support of the adoption. So please speak up if you =
believe
>         > the draft is useful and the WG shall work on getting it =
published.
>         >=20
>         > On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica
>         > <rbonica=3D40juniper.net@dmarc.ietf.org =
<mailto:40juniper.net@dmarc.ietf.org>> wrote:
>         >>
>         >> Folks,
>         >>
>         >>
>         >>
>         >> This email begins a Call For Adoption on =
draft-wang-opsec-tls-proxy-bp.
>         >>
>         >>
>         >>
>         >> Please send comments to opsec@ietf.org =
<mailto:opsec@ietf.org> by August 3, 2020.
>         >>
>         >>
>         >>
>         >>                                                             =
    Ron
>         >>
>         >>
>         >>
>         >>
>         >> Juniper Business Use Only
>         >>
>         >> _______________________________________________
>         >> OPSEC mailing list
>         >> OPSEC@ietf.org <mailto:OPSEC@ietf.org>
>         >> https://www.ietf.org/mailman/listinfo/opsec =
<https://www.ietf.org/mailman/listinfo/opsec>
>         >=20
>         >=20
>         >=20
>         > --
>         > SY, Jen Linkova aka Furry
>         >=20
>         > _______________________________________________
>         > TLS mailing list
>         > TLS@ietf.org <mailto:TLS@ietf.org>
>         > https://www.ietf.org/mailman/listinfo/tls =
<https://www.ietf.org/mailman/listinfo/tls>
>         >=20
>=20
>=20
> _______________________________________________
> TLS mailing list
> TLS@ietf.org <mailto:TLS@ietf.org>
> https://www.ietf.org/mailman/listinfo/tls =
<https://www.ietf.org/mailman/listinfo/tls>
> _______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">As =
co-author I support adoption of the draft and appreciate the =
feedback.<div class=3D""><br class=3D""></div><div class=3D"">The =
authors agreed at the time that the OPSEC WG charter would better match =
our intention of documenting the BCP for TLS proxies given that the TLS =
WG charter places more of an emphasis on the TLS protocol. &nbsp;Having =
said that, we do also agree that the TLS WG should be involved. =
&nbsp;The recommendation from the TLS WG chairs was to continue in OPSEC =
and to cc the TLS WG.</div><div class=3D""><br class=3D""></div><div =
class=3D"">--Roelof</div><div class=3D""><br class=3D""><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">On Jul =
27, 2020, at 9:30 AM, Ben Schwartz &lt;<a =
href=3D"mailto:bemasc=3D40google.com@dmarc.ietf.org" =
class=3D"">bemasc=3D40google.com@dmarc.ietf.org</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div dir=3D"ltr" =
class=3D""><div dir=3D"ltr" class=3D"">I'm concerned about this work =
happening outside the TLS working group.&nbsp; For example, the question =
of proper handling of TLS extensions is not addressed at all in this =
draft, and has significant security and functionality =
implications.&nbsp; There are various other tricky protocol issues (e.g. =
version negotiation, TLS 1.3 record padding, TLS 1.3 0-RTT vs. TLS 1.2 =
False Start, round-trip deadlock when buffers fill, ticket (non-)reuse, =
client certificate linkability pre-TLS-1.3, implications of SAN scope of =
synthesized certificates) that could arise and are going to be difficult =
to get right in any other WG.<div class=3D""><br class=3D""></div><div =
class=3D"">The title "TLS Proxy Best Practice" implies that it is =
possible to proxy TLS correctly, and that this document is the main =
source for how to do it.&nbsp; I think the TLS WG is the right place to =
make those judgments..&nbsp; For the OpSec group, I think a =
more&nbsp;appropriate draft would&nbsp;be something like "TLS =
Interception Pitfalls", documenting the operational experience on =
failure modes of TLS interception.</div></div><br class=3D""><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Jul =
27, 2020 at 8:57 AM Nancy Cam-Winget (ncamwing) &lt;ncamwing=3D<a =
href=3D"mailto:40cisco.com@dmarc.ietf.org" =
class=3D"">40cisco.com@dmarc.ietf.org</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex">The document is not imposing any =
standards but rather provide guidelines for those implementing TLS =
proxies;&nbsp; given that proxies will continue to exist I'm not sure =
why there is a belief that the IETF should ignore this.<br class=3D"">
<br class=3D"">
Warm regards, Nancy<br class=3D"">
<br class=3D"">
=EF=BB=BFOn 7/27/20, 5:20 AM, "OPSEC on behalf of Blumenthal, Uri - 0553 =
- MITLL" &lt;<a href=3D"mailto:opsec-bounces@ietf.org" target=3D"_blank" =
class=3D"">opsec-bounces@ietf.org</a> on behalf of <a =
href=3D"mailto:uri@ll.mit.edu" target=3D"_blank" =
class=3D"">uri@ll.mit.edu</a>&gt; wrote:<br class=3D"">
<br class=3D"">
&nbsp; &nbsp; I support Stephen and oppose adoption. IMHO, this is not a =
technology that IETF should standardize.<br class=3D"">
<br class=3D"">
<br class=3D"">
&nbsp; &nbsp; On 7/25/20, 10:07, "TLS on behalf of Stephen Farrell" =
&lt;<a href=3D"mailto:tls-bounces@ietf.org" target=3D"_blank" =
class=3D"">tls-bounces@ietf.org</a> on behalf of <a =
href=3D"mailto:stephen.farrell@cs.tcd.ie" target=3D"_blank" =
class=3D"">stephen.farrell@cs.tcd.ie</a>&gt; wrote:<br class=3D"">
<br class=3D"">
<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; I oppose adoption. While there could be some =
minor benefit<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; in documenting the uses and abuses seen when =
mitm'ing tls,<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; I doubt that the effort to ensure a balanced =
document is at<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; all worthwhile. The current draft is too far =
from what it'd<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; need to be to be adopted.<br class=3D"">
<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; Send to ISE.<br class=3D"">
<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; S.<br class=3D"">
<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; On 23/07/2020 02:30, Jen Linkova wrote:<br =
class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; One thing to add here: the chairs would =
like to hear active and<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; explicit support of the adoption. So =
please speak up if you believe<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; the draft is useful and the WG shall =
work on getting it published.<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; <br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; On Mon, Jul 20, 2020 at 3:35 AM Ron =
Bonica<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; &lt;rbonica=3D<a =
href=3D"mailto:40juniper.net@dmarc.ietf.org" target=3D"_blank" =
class=3D"">40juniper.net@dmarc.ietf.org</a>&gt; wrote:<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt; Folks,<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt; This email begins a Call For =
Adoption on draft-wang-opsec-tls-proxy-bp.<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt; Please send comments to <a =
href=3D"mailto:opsec@ietf.org" target=3D"_blank" =
class=3D"">opsec@ietf.org</a> by August 3, 2020.<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Ron<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt; Juniper Business Use Only<br =
class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt;<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt; =
_______________________________________________<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt; OPSEC mailing list<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt; <a href=3D"mailto:OPSEC@ietf.org" =
target=3D"_blank" class=3D"">OPSEC@ietf.org</a><br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt;&gt; <a =
href=3D"https://www.ietf.org/mailman/listinfo/opsec" rel=3D"noreferrer" =
target=3D"_blank" =
class=3D"">https://www.ietf.org/mailman/listinfo/opsec</a><br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; <br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; <br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; <br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; --<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; SY, Jen Linkova aka Furry<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; <br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; =
_______________________________________________<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; TLS mailing list<br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; <a href=3D"mailto:TLS@ietf.org" =
target=3D"_blank" class=3D"">TLS@ietf.org</a><br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; <a =
href=3D"https://www.ietf.org/mailman/listinfo/tls" rel=3D"noreferrer" =
target=3D"_blank" =
class=3D"">https://www.ietf.org/mailman/listinfo/tls</a><br class=3D"">
&nbsp; &nbsp; &nbsp; &nbsp; &gt; <br class=3D"">
<br class=3D"">
<br class=3D"">
_______________________________________________<br class=3D"">
TLS mailing list<br class=3D"">
<a href=3D"mailto:TLS@ietf.org" target=3D"_blank" =
class=3D"">TLS@ietf.org</a><br class=3D"">
<a href=3D"https://www.ietf.org/mailman/listinfo/tls" rel=3D"noreferrer" =
target=3D"_blank" =
class=3D"">https://www.ietf.org/mailman/listinfo/tls</a><br class=3D"">
</blockquote></div></div>
_______________________________________________<br class=3D"">TLS =
mailing list<br class=3D""><a href=3D"mailto:TLS@ietf.org" =
class=3D"">TLS@ietf.org</a><br =
class=3D"">https://www.ietf.org/mailman/listinfo/tls<br =
class=3D""></div></blockquote></div><br class=3D""></div></body></html>=

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From: Roelof duToit <r@nerd.ninja>
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Cc: Nick Harper <nharper=40google.com@dmarc.ietf.org>, Ben Schwartz <bemasc=40google.com@dmarc.ietf.org>, "Nancy Cam-Winget (ncamwing)" <ncamwing=40cisco.com@dmarc.ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [OPSEC] [EXTERNAL] Re: [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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	charset=utf-8

Thank you Andrei.

> The document does not describe alternatives to MITM proxies.

The [SECURITY_IMPACT] paper mentions alternatives, and we could =
certainly include a high-level summary of some of those even though our =
intention was to document the BCP for TLS proxies where the reader is =
considering a TLS proxy network function.   If we do include an expanded =
section on alternatives then it should also reference the capabilities =
and limitations of endpoint-only security solutions (reference: =
https://datatracker.ietf.org/doc/html/draft-taddei-smart-cless-introductio=
n-03 =
<https://datatracker.ietf.org/doc/html/draft-taddei-smart-cless-introducti=
on-03>)

> Section 4.1.2 =E2=80=9CInbound provisioning=E2=80=9D does not discuss =
security and operational issues around server key sharing with the =
proxy. No real discussion of short-lived creds and =E2=80=9Ckeyless=E2=80=9D=
 scenarios.

Sections 4.1 and 4.12 provide guidelines and leaves the implementation =
up to the developer.  That is not to say that we cannot be more specific =
about key sharing and key storage for inbound solutions.   We could =
certainly mention draft-ietf-tls-subcerts as well.

> Section 4.2 =E2=80=9CMaintain security posture and limit =
modifications=E2=80=9D seems to recommend modifications to the =
ClientHello, rather than having the proxy generate a new ClientHello. =
Proxies sending ClientHellos they did not generate are a common cause of =
interop issues.

That section needs more clarification.  We are most certainly not =
proposing that TLS proxies should forward the original ClientHello and =
are aware of the risks - especially when RSA key exchange is used.  The =
intention of section 4.2 is for the TLS proxy to base certain attributes =
of the generated ClientHello on what was advertised by the client, with =
the goal of maintaining the security posture.


> Section 4.2 also explicitly allows completely insecure configurations:
>       =E2=80=9CTLS proxy stacks MAY provide user configurable options, =
such as an
>    option to accept self-signed server certificates, an option to let
>    the handshake continue with expired but otherwise valid server
>    certificates, etc.=E2=80=9D


That paragraph needs examples.   One such example is where =
device-to-device communication in the enterprise traverses the TLS proxy =
and where said devices must be excluded from further inspection based on =
a combination of policy attributes - it is not always practical to =
update the devices.


--Apple-Mail=_147F458E-1F50-4EB8-B6FA-7DAA36986172
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	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">Thank=
 you Andrei.<div class=3D""><br class=3D""></div><div =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;"><ul type=3D"disc" style=3D"margin-bottom: 0in; =
margin-top: 0in;" class=3D""><li class=3D"MsoListParagraph" =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;">The document does not describe alternatives to MITM =
proxies.</li></ul></div></div></blockquote><div><br =
class=3D""></div><div>The [SECURITY_IMPACT] paper mentions alternatives, =
and we could certainly include a high-level summary of some of those =
even though our intention was to document the BCP for TLS proxies where =
the reader is considering a TLS proxy network function. &nbsp; If we do =
include an expanded section on alternatives then it should also =
reference the capabilities and limitations of endpoint-only security =
solutions (reference:&nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/html/draft-taddei-smart-cless-int=
roduction-03" =
class=3D"">https://datatracker.ietf.org/doc/html/draft-taddei-smart-cless-=
introduction-03</a>)</div><div><br class=3D""></div><blockquote =
type=3D"cite" class=3D""><div class=3D""><div class=3D"WordSection1" =
style=3D"page: WordSection1; caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 14px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;"><ul type=3D"disc" style=3D"margin-bottom: 0in; margin-top: 0in;" =
class=3D""><li class=3D"MsoListParagraph" style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;">Section 4.1.2 =
=E2=80=9CInbound provisioning=E2=80=9D does not discuss security and =
operational issues around server key sharing with the proxy. No real =
discussion of short-lived creds and =E2=80=9Ckeyless=E2=80=9D =
scenarios.</li></ul></div></div></blockquote><div><br =
class=3D""></div><div>Sections 4.1 and 4.12 provide guidelines and =
leaves the implementation up to the developer. &nbsp;That is not to say =
that we cannot be more specific about key sharing and key storage for =
inbound solutions. &nbsp; We could certainly =
mention&nbsp;draft-ietf-tls-subcerts as well.</div><div><br =
class=3D""></div><blockquote type=3D"cite" class=3D""><div class=3D""><div=
 class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;"><ul type=3D"disc" style=3D"margin-bottom: 0in; =
margin-top: 0in;" class=3D""><li class=3D"MsoListParagraph" =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;">Section 4.2 =E2=80=9CMaintain security posture and limit =
modifications=E2=80=9D seems to recommend modifications to the =
ClientHello, rather than having the proxy generate a new ClientHello. =
Proxies sending ClientHellos they did not generate are a common cause of =
interop issues.</li></ul></div></div></blockquote><div><br =
class=3D""></div><div>That section needs more clarification. &nbsp;We =
are most certainly not proposing that TLS proxies should forward the =
original ClientHello and are aware of the risks - especially when RSA =
key exchange is used. &nbsp;The intention of section 4.2 is for the TLS =
proxy to base certain attributes of the <b =
class=3D"">generated</b>&nbsp;ClientHello on what was advertised by the =
client, with the goal of maintaining the security posture.</div><div><br =
class=3D""></div><div><br class=3D""></div><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D"WordSection1" style=3D"page: =
WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 14px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;"><ul type=3D"disc" style=3D"margin-bottom: 0in; margin-top: 0in;" =
class=3D""><li class=3D"MsoListParagraph" style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;">Section 4.2 also =
explicitly allows completely insecure configurations:<o:p =
class=3D""></o:p></li></ul><pre style=3D"margin: 0in 0in 0.0001pt; =
font-size: 10pt; font-family: &quot;Courier New&quot;;" class=3D""><span =
style=3D"font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =E2=80=9C</span><span style=3D""=
 class=3D"">TLS proxy stacks MAY provide user configurable options, such =
as an<o:p class=3D""></o:p></span></pre><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size: 10pt; font-family: &quot;Courier New&quot;;" =
class=3D"">&nbsp;&nbsp; option to accept self-signed server =
certificates, an option to let<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D""><span style=3D"font-size: 10pt; font-family: =
&quot;Courier New&quot;;" class=3D"">&nbsp;&nbsp; the handshake continue =
with expired but otherwise valid server<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in; font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size: 10pt; font-family: &quot;Courier New&quot;;" =
class=3D"">&nbsp;&nbsp; certificates, =
etc.=E2=80=9D</span></div></div></div></blockquote><div><br =
class=3D""></div><div><br class=3D""></div><div>That paragraph needs =
examples. &nbsp; One such example is where device-to-device =
communication in the enterprise traverses the TLS proxy and where said =
devices must be excluded from further inspection based on a combination =
of policy attributes - it is not always practical to update the =
devices.</div><div><br class=3D""></div></div></div></body></html>=

--Apple-Mail=_147F458E-1F50-4EB8-B6FA-7DAA36986172--


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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 Operational Security Capabilities for IP Network Infrastructure WG of the IETF.

        Title           : Impact of TLS 1.3 to Operational Network Security Practices
        Authors         : Nancy Cam-Winget
                          Eric Wang
                          Roman Danyliw
                          Roelof DuToit
	Filename        : draft-ietf-opsec-ns-impact-01.txt
	Pages           : 17
	Date            : 2020-07-27

Abstract:
   Network-based security solutions are used by enterprises, the public
   sector, internet-service providers, and cloud-service providers to
   both complement and enhance host-based security solutions.  As TLS is
   a widely deployed protocol to secure communication, these network-
   based security solutions must necessarily interact with it.  This
   document describes this interaction for current operational security
   practices and notes the impact of TLS 1.3 on them.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-opsec-ns-impact/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-opsec-ns-impact-01
https://datatracker.ietf.org/doc/html/draft-ietf-opsec-ns-impact-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-opsec-ns-impact-01


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/



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From: "Eric Wang (ejwang)" <ejwang@cisco.com>
To: Nick Harper <nharper=40google.com@dmarc.ietf.org>
CC: Ben Schwartz <bemasc=40google.com@dmarc.ietf.org>, "Nancy Cam-Winget (ncamwing)" <ncamwing=40cisco.com@dmarc.ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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From: "Eric Wang (ejwang)" <ejwang@cisco.com>
To: "Salz, Rich" <rsalz=40akamai.com@dmarc.ietf.org>
CC: Ira McDonald <blueroofmusic@gmail.com>, "Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu>, OPSEC <opsec@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>, "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Date: Mon, 27 Jul 2020 23:48:47 +0000
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Thanks you Rich.  Obviously I support the adoption as one of the authors. B=
ut more importantly, the reality of growing TLS proxy was the driver for st=
arting the draft.  That has been a sidecar with the progression of TLS and =
its wide deployment.  We felt the lack of a baseline bcp is going to hurt t=
he security posture of TLS rather than driving the intermediary away.

Best,
-Eric


On Jul 27, 2020, at 5:37 AM, Salz, Rich <rsalz=3D40akamai.com@dmarc.ietf.or=
g<mailto:rsalz=3D40akamai.com@dmarc.ietf.org>> wrote:

Not adopting this seems to be ignoring reality. There are places which use =
TLS intermediaries. Are those users not welcome here?

I support adoption.
_______________________________________________
OPSEC mailing list
OPSEC@ietf.org<mailto:OPSEC@ietf.org>
https://www.ietf.org/mailman/listinfo/opsec


--_000_25CD4A365BE54B70ACA704494C017D9Dciscocom_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; line-break:=
 after-white-space;" class=3D"">
Thanks you Rich. &nbsp;Obviously I support the adoption as one of the autho=
rs. But more importantly, the reality of growing TLS proxy was the driver f=
or starting the draft. &nbsp;That has been a sidecar with the<font face=3D"=
LucidaSans-Typewriter" class=3D""><span style=3D"font-size: 14px;" class=3D=
"">&nbsp;progression
 of TLS and its wide deployment. &nbsp;We felt the lack of a baseline bcp i=
s going to hurt the security posture of TLS rather than driving the interme=
diary away.</span></font>
<div class=3D""><font face=3D"LucidaSans-Typewriter" class=3D""><br class=
=3D"">
</font></div>
<div class=3D""><font face=3D"LucidaSans-Typewriter" class=3D"">Best,</font=
></div>
<div class=3D""><font face=3D"LucidaSans-Typewriter" class=3D"">-Eric</font=
></div>
<div class=3D""><font face=3D"LucidaSans-Typewriter" class=3D""><br class=
=3D"">
</font>
<div><br class=3D"">
<blockquote type=3D"cite" class=3D"">
<div class=3D"">On Jul 27, 2020, at 5:37 AM, Salz, Rich &lt;<a href=3D"mail=
to:rsalz=3D40akamai.com@dmarc.ietf.org" class=3D"">rsalz=3D40akamai.com@dma=
rc.ietf.org</a>&gt; wrote:</div>
<br class=3D"Apple-interchange-newline">
<div class=3D"">
<div class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0=
, 0, 0); font-family: LucidaSans-Typewriter; font-size: 14px; font-style: n=
ormal; font-variant-caps: normal; font-weight: normal; letter-spacing: norm=
al; text-align: start; text-indent: 0px; text-transform: none; white-space:=
 normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration=
: none;">
<div style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calib=
ri, sans-serif;" class=3D"">
Not adopting this seems to be ignoring reality. There are places which use =
TLS intermediaries. Are those users not welcome here?<o:p class=3D""></o:p>=
</div>
<div style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calib=
ri, sans-serif;" class=3D"">
<o:p class=3D"">&nbsp;</o:p></div>
<div style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calib=
ri, sans-serif;" class=3D"">
I support adoption.<o:p class=3D""></o:p></div>
</div>
<span style=3D"caret-color: rgb(0, 0, 0); font-family: LucidaSans-Typewrite=
r; font-size: 14px; font-style: normal; font-variant-caps: normal; font-wei=
ght: normal; letter-spacing: normal; text-align: start; text-indent: 0px; t=
ext-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-s=
troke-width: 0px; text-decoration: none; float: none; display: inline !impo=
rtant;" class=3D"">_______________________________________________</span><b=
r style=3D"caret-color: rgb(0, 0, 0); font-family: LucidaSans-Typewriter; f=
ont-size: 14px; font-style: normal; font-variant-caps: normal; font-weight:=
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Date: Tue, 28 Jul 2020 01:35:47 +0100
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
To: "Eric Wang (ejwang)" <ejwang=40cisco.com@dmarc.ietf.org>,
 "Salz, Rich" <rsalz=40akamai.com@dmarc.ietf.org>
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Subject: Re: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
References: <DM6PR05MB634890A51C4AF3CB1A03DA0BAE7A0@DM6PR05MB6348.namprd05.prod.outlook.com>
 <CAFU7BAS=ymUPTAGB_fOSrHTG0OajV1n5M1-yOBWxvGam-a89AA@mail.gmail.com>
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On 28/07/2020 00:48, Eric Wang (ejwang) wrote:
> We felt the lack of a
> baseline bcp is going to hurt the security posture of TLS rather than
> driving the intermediary away.

That makes no sense to me.

Adopting this draft will require eliminating all such
gibberish and instead finding text that can garner IETF
consensus. I really do not think that effort is worth
the significant cost for anyone involved, pro-MITM or
not.

S.


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From: Roelof duToit <r@nerd.ninja>
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Date: Mon, 27 Jul 2020 22:44:47 -0400
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Cc: "Eric Wang (ejwang)" <ejwang=40cisco.com@dmarc.ietf.org>, "Salz, Rich" <rsalz=40akamai.com@dmarc.ietf.org>, OPSEC <opsec@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>, "tls@ietf.org" <tls@ietf.org>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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RFC 8446, section 9.3 states:
Note that TLS's protocol requirements and security analysis only
apply to the two connections separately.  Safely deploying a TLS
terminator requires additional security considerations which are
beyond the scope of this document.

The context of that paragraph is "A middlebox which terminates a TLS =
connection" and it implies that there are undocumented security =
considerations.
The tls-proxy-bp draft is a contribution towards that goal and we think =
it is worth the effort.

--Roelof


> On Jul 27, 2020, at 8:35 PM, Stephen Farrell =
<stephen.farrell@cs.tcd.ie> wrote:
>=20
>=20
>=20
> On 28/07/2020 00:48, Eric Wang (ejwang) wrote:
>> We felt the lack of a
>> baseline bcp is going to hurt the security posture of TLS rather than
>> driving the intermediary away.
>=20
> That makes no sense to me.
>=20
> Adopting this draft will require eliminating all such
> gibberish and instead finding text that can garner IETF
> consensus. I really do not think that effort is worth
> the significant cost for anyone involved, pro-MITM or
> not.
>=20
> S.
>=20
> =
<0x5AB2FAF17B172BEA.asc>_______________________________________________
> OPSEC mailing list
> OPSEC@ietf.org
> https://www.ietf.org/mailman/listinfo/opsec


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">RFC =
8446, section 9.3 states:<div class=3D""><i class=3D"">Note that TLS's =
protocol requirements and security analysis only</i></div><div =
class=3D""><div class=3D""><i class=3D"">apply to the two connections =
separately. &nbsp;Safely deploying a TLS</i></div><div class=3D""><i =
class=3D"">terminator requires additional security considerations which =
are</i></div><div class=3D""><i class=3D"">beyond the scope of this =
document.</i></div><div class=3D""><br class=3D""></div><div =
class=3D"">The context of that paragraph is "<i class=3D"">A middlebox =
which terminates a TLS connection</i>" and it implies that there are <b =
class=3D"">undocumented</b> security considerations.</div><div =
class=3D"">The tls-proxy-bp draft is a contribution towards that goal =
and we think it is worth the effort.</div><div class=3D""><br =
class=3D""></div><div class=3D"">--Roelof</div><div class=3D""><br =
class=3D""></div><div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D"">On Jul 27, 2020, at 8:35 PM, Stephen Farrell =
&lt;<a href=3D"mailto:stephen.farrell@cs.tcd.ie" =
class=3D"">stephen.farrell@cs.tcd.ie</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div class=3D""><br =
class=3D""><br class=3D"">On 28/07/2020 00:48, Eric Wang (ejwang) =
wrote:<br class=3D""><blockquote type=3D"cite" class=3D"">We felt the =
lack of a<br class=3D"">baseline bcp is going to hurt the security =
posture of TLS rather than<br class=3D"">driving the intermediary =
away.<br class=3D""></blockquote><br class=3D"">That makes no sense to =
me.<br class=3D""><br class=3D"">Adopting this draft will require =
eliminating all such<br class=3D"">gibberish and instead finding text =
that can garner IETF<br class=3D"">consensus. I really do not think that =
effort is worth<br class=3D"">the significant cost for anyone involved, =
pro-MITM or<br class=3D"">not.<br class=3D""><br class=3D"">S.<br =
class=3D""><br class=3D""><span =
id=3D"cid:3C568554-C1F7-4C5B-BDCA-F2FDA5D95403">&lt;0x5AB2FAF17B172BEA.asc=
&gt;</span>_______________________________________________<br =
class=3D"">OPSEC mailing list<br class=3D""><a =
href=3D"mailto:OPSEC@ietf.org" class=3D"">OPSEC@ietf.org</a><br =
class=3D"">https://www.ietf.org/mailman/listinfo/opsec<br =
class=3D""></div></div></blockquote></div><br =
class=3D""></div></body></html>=

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From: Ashutosh Singh <ashusing@gmail.com>
Date: Mon, 27 Jul 2020 22:22:47 -0700
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To: Roelof duToit <r@nerd.ninja>
Cc: Stephen Farrell <stephen.farrell@cs.tcd.ie>, OPSEC <opsec@ietf.org>,  OpSec Chairs <opsec-chairs@ietf.org>, "tls@ietf.org" <tls@ietf.org>,  "Salz, Rich" <rsalz=40akamai.com@dmarc.ietf.org>,  "Eric Wang (ejwang)" <ejwang=40cisco.com@dmarc.ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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I agree with the proposed approach and I also believe in discussion around
safe and responsible middlebox deployment. I support the adoption of this
draft!

Regards
-Ashu

On Mon, Jul 27, 2020 at 7:45 PM Roelof duToit <r@nerd.ninja> wrote:

> RFC 8446, section 9.3 states:
> *Note that TLS's protocol requirements and security analysis only*
> *apply to the two connections separately.  Safely deploying a TLS*
> *terminator requires additional security considerations which are*
> *beyond the scope of this document.*
>
> The context of that paragraph is "*A middlebox which terminates a TLS
> connection*" and it implies that there are *undocumented* security
> considerations.
> The tls-proxy-bp draft is a contribution towards that goal and we think it
> is worth the effort.
>
> --Roelof
>
>
> On Jul 27, 2020, at 8:35 PM, Stephen Farrell <stephen.farrell@cs.tcd.ie>
> wrote:
>
>
>
> On 28/07/2020 00:48, Eric Wang (ejwang) wrote:
>
> We felt the lack of a
> baseline bcp is going to hurt the security posture of TLS rather than
> driving the intermediary away.
>
>
> That makes no sense to me.
>
> Adopting this draft will require eliminating all such
> gibberish and instead finding text that can garner IETF
> consensus. I really do not think that effort is worth
> the significant cost for anyone involved, pro-MITM or
> not.
>
> S.
>
> <0x5AB2FAF17B172BEA.asc>_______________________________________________
> OPSEC mailing list
> OPSEC@ietf.org
> https://www.ietf.org/mailman/listinfo/opsec
>
>
> _______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls
>

--000000000000d96aae05ab79a108
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<div dir=3D"ltr">I agree with the proposed approach and I also believe in d=
iscussion around safe and responsible middlebox deployment. I support the a=
doption of this draft!<div><br></div><div>Regards</div><div>-Ashu</div></di=
v><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On M=
on, Jul 27, 2020 at 7:45 PM Roelof duToit &lt;r@nerd.ninja&gt; wrote:<br></=
div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bor=
der-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,20=
4);padding-left:1ex"><div style=3D"word-wrap:break-word;line-break:after-wh=
ite-space">RFC 8446, section 9.3 states:<div><i>Note that TLS&#39;s protoco=
l requirements and security analysis only</i></div><div><div><i>apply to th=
e two connections separately.=C2=A0 Safely deploying a TLS</i></div><div><i=
>terminator requires additional security considerations which are</i></div>=
<div><i>beyond the scope of this document.</i></div><div><br></div><div>The=
 context of that paragraph is &quot;<i>A middlebox which terminates a TLS c=
onnection</i>&quot; and it implies that there are <b>undocumented</b> secur=
ity considerations.</div><div>The tls-proxy-bp draft is a contribution towa=
rds that goal and we think it is worth the effort.</div><div><br></div><div=
>--Roelof</div><div><br></div><div><br><blockquote type=3D"cite"><div>On Ju=
l 27, 2020, at 8:35 PM, Stephen Farrell &lt;<a href=3D"mailto:stephen.farre=
ll@cs.tcd.ie" target=3D"_blank">stephen.farrell@cs.tcd.ie</a>&gt; wrote:</d=
iv><br><div><div><br><br>On 28/07/2020 00:48, Eric Wang (ejwang) wrote:<br>=
<blockquote type=3D"cite">We felt the lack of a<br>baseline bcp is going to=
 hurt the security posture of TLS rather than<br>driving the intermediary a=
way.<br></blockquote><br>That makes no sense to me.<br><br>Adopting this dr=
aft will require eliminating all such<br>gibberish and instead finding text=
 that can garner IETF<br>consensus. I really do not think that effort is wo=
rth<br>the significant cost for anyone involved, pro-MITM or<br>not.<br><br=
>S.<br><br><span id=3D"gmail-m_6497022570780762901cid:3C568554-C1F7-4C5B-BD=
CA-F2FDA5D95403">&lt;0x5AB2FAF17B172BEA.asc&gt;</span>_____________________=
__________________________<br>OPSEC mailing list<br><a href=3D"mailto:OPSEC=
@ietf.org" target=3D"_blank">OPSEC@ietf.org</a><br><a href=3D"https://www.i=
etf.org/mailman/listinfo/opsec" target=3D"_blank">https://www.ietf.org/mail=
man/listinfo/opsec</a><br></div></div></blockquote></div><br></div></div>__=
_____________________________________________<br>
TLS mailing list<br>
<a href=3D"mailto:TLS@ietf.org" target=3D"_blank">TLS@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/tls" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/tls</a><br>
</blockquote></div>

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Date: Tue, 28 Jul 2020 17:25:48 +1000
From: "Martin Thomson" <mt@lowentropy.net>
To: "Ron Bonica" <rbonica=40juniper.net@dmarc.ietf.org>, OPSEC <opsec@ietf.org>
Cc: "tls@ietf.org" <tls@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/opsec/Z4UxdTEziOWr4OA4IJwBMTzvyU4>
Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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On Mon, Jul 20, 2020, at 03:34, Ron Bonica wrote:
> This email begins a Call For Adoption on draft-wang-opsec-tls-proxy-bp 
> <https://datatracker.ietf.org/doc/draft-wang-opsec-tls-proxy-bp/>.

I think that others have said enough about the wisdom of adoption of the approach.  I agree with them, but recognize the right to disagree.

Even if we were to accept that it is a good idea to document best practices for TLS proxying, this document is not currently a good basis for that work.  The introduction is a little deceptive, in that it says that it is about proxying, but there are numerous places in the draft that talk about selective proxying or some amount of forwarding and inspection.  Those practices would require design work.  From what I can infer from the draft, it often assumes the same sort of bad designs that are specifically identified elsewhere as having bad characteristics.

As it is, the draft is not consistent in terms of its approach and scope.  If the goal is to describe pure proxying (a TLS server and a TLS client that intermediate), then it needs a good edit.  If the goal is to describe selective proxying or selective forwarding and modification of TLS messages, then that is a much bigger task.  What are often stated in the draft as requirements around this points are in fact assumptions.  And many of them bad, as others have stated.

--- More detail follows

Intermediaries if this nature are added to effect some sort of centralized control.  This seems to be the primary motivation here also.  If we accept that this is happening, it is important to note the operational effects of that.  Not just on those who have this desire, but on all of those affected.

There is some text about the effect this might have on the ability of clients or servers to introduce new features in Section 4.8.  This is nowhere near sufficient.  By breaking the connection the number of stack layers that are exposed to potential interference, the consequences are not limited to TLS.

Creating negative externalities contributes to TLS interception being despised.  If the intent is to help, then this doesn't go nearly far enough in describing the secondary effects a proxy might cause.


Probably the worst problem is rooted in Section 5.1.  The introduction establishes this as being about proxying, but there are several places that talk about not-proxying sometimes.

Selective non-proxying opens the document up to a whole new set of problems that arise from poor designs for deciding not to proxy.  There is not nearly enough detail here to address this problem properly.  A "good" design for selective TLS proxying does not seem to be the basis of the recommendations.  I'll give a few examples of problems.

>From the Section 4.8 again:

> the TLS proxy MUST conduct proper TLS protocol checks to avoid false identification of TLS handshakes, while taking special care not to contribute to protocol ossification.  

This practice has been directly responsible for more ossification than intermediation, no matter what qualification exists.  

If per-destination not-proxying is required, the proxy can connect to a server, determine that the server is on a non-proxy list, and then complete the handshake with the client (with a caveat regarding ECH here).  I can guess why this doesn't happen (it's expensive and see also Section 5.4), but that doesn't excuse the practice.

The following text from Section 5.3 is deeply problematic:

   A decryption policy decision MAY be made based on the server
   certificate or other trustworthy parameters.  To verify possession of
   private keys that are associated with a particular server
   certificate, the proxy SHOULD complete an out-of-band TLS handshake
   with the same TLS server IP address and TCP port as targeted by the
   TLS client.

It is possible that the authors misunderstand how TLS works, but this check won't work.  Not only because TLS 1.3 encrypts information, but because this is only necessary if the proxy forwards a ClientHello from the client to the server.  At that point, it is too late and the damage has been done (see Andrei's review).


There are a bunch of places where pure proxying - as described in the introduction - is not assumed.  This leads to the same problems already cited.  For instance, in Section 4.2:

> The proxy MAY remove cipher suites from a client-initiated Client Hello message, add new cipher suites, and re-order them in the proxy-initiated Client Hello message.


From nobody Tue Jul 28 01:35:55 2020
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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I strongly support this work as it represents capabilities that are being d=
eveloped, deployed and used in practice. It has good intentions and provide=
s a good approach in the context of defense in depth approaches. No securit=
y cannot be just on both ends of the communication. One can dream about it =
but that is not how reality is. Removing this possibility is a limit to the=
 overall defense.

I do not understand the reasons behind ignoring reality and the IETF would =
have, in my naive mind, a strong interest in getting this work under good c=
ommunity adoption so that it is kept in good control with validated best pr=
actices. Everyone would win.

I support this draft


Sent with ProtonMail Secure Email.

=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90 Original Me=
ssage =E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90
On Thursday 23 July 2020 03:30, Jen Linkova <furry13@gmail.com> wrote:

> One thing to add here: the chairs would like to hear active and
> explicit support of the adoption. So please speak up if you believe
> the draft is useful and the WG shall work on getting it published.
>
> On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica
> rbonica=3D40juniper.net@dmarc.ietf.org wrote:
>
> > Folks,
> > This email begins a Call For Adoption on draft-wang-opsec-tls-proxy-bp.
> > Please send comments to opsec@ietf.org by August 3, 2020.
> >
> >                                                                 Ron
> >
> >
> > Juniper Business Use Only
> >
> > OPSEC mailing list
> > OPSEC@ietf.org
> > https://www.ietf.org/mailman/listinfo/opsec
>
> --
>
> SY, Jen Linkova aka Furry
>
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls



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From: Eric Rescorla <ekr@rtfm.com>
Date: Tue, 28 Jul 2020 04:12:55 -0700
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To: Martin Thomson <mt@lowentropy.net>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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--0000000000009232e805ab7e87a9
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On Tue, Jul 28, 2020 at 12:26 AM Martin Thomson <mt@lowentropy.net> wrote:

> The following text from Section 5.3 is deeply problematic:
>
>    A decryption policy decision MAY be made based on the server
>    certificate or other trustworthy parameters.  To verify possession of
>    private keys that are associated with a particular server
>    certificate, the proxy SHOULD complete an out-of-band TLS handshake
>    with the same TLS server IP address and TCP port as targeted by the
>    TLS client.
>
> It is possible that the authors misunderstand how TLS works, but this
> check won't work.  Not only because TLS 1.3 encrypts information, but
> because this is only necessary if the proxy forwards a ClientHello from the
> client to the server.


In addition, this check is susceptible to trivial forwarding attack in
which the server in question forwards the data to the true server.

-Ekr

--0000000000009232e805ab7e87a9
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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jul 28, 2020 at 12:26 AM Mart=
in Thomson &lt;<a href=3D"mailto:mt@lowentropy.net">mt@lowentropy.net</a>&g=
t; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
The following text from Section 5.3 is deeply problematic:<br>
<br>
=C2=A0 =C2=A0A decryption policy decision MAY be made based on the server<b=
r>
=C2=A0 =C2=A0certificate or other trustworthy parameters.=C2=A0 To verify p=
ossession of<br>
=C2=A0 =C2=A0private keys that are associated with a particular server<br>
=C2=A0 =C2=A0certificate, the proxy SHOULD complete an out-of-band TLS hand=
shake<br>
=C2=A0 =C2=A0with the same TLS server IP address and TCP port as targeted b=
y the<br>
=C2=A0 =C2=A0TLS client.<br>
<br>
It is possible that the authors misunderstand how TLS works, but this check=
 won&#39;t work.=C2=A0 Not only because TLS 1.3 encrypts information, but b=
ecause this is only necessary if the proxy forwards a ClientHello from the =
client to the server.</blockquote><div><br></div><div>In addition, this che=
ck is susceptible to trivial forwarding attack in which the server in quest=
ion forwards the data to the true server.</div><div><br></div><div>-Ekr</di=
v><div><br></div></div></div>

--0000000000009232e805ab7e87a9--


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From: "Dan Li" <tolidan@tsinghua.edu.cn>
To: <opsec@ietf.org>, <opsawg@ietf.org>
Cc: "'Lancheng Qin'" <qlc19@mails.tsinghua.edu.cn>, "'Tao Lin'" <lintao@h3c.com>, "'Yunan Gu'" <guyunan@huawei.com>, "'Jianping Wu'" <jianping@cernet.edu.cn>
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Subject: Re: [OPSEC] Confirm submission of I-D draft-li-sava-intra-domain-use-cases
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Dear all,

We have a draft presentation today in the OPSA working group today, =
about the problems for existing SAV (source address validation) =
solutions. Enclosed please find the draft and presentation slides. You =
are welcome to join and give us suggestions/comments.

Thanks,
Dan Li

-----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
=E5=8F=91=E4=BB=B6=E4=BA=BA: IETF I-D Submission Tool =
[mailto:idsubmission@ietf.org]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B47=E6=9C=8814=E6=97=A5 =
1:01
=E6=94=B6=E4=BB=B6=E4=BA=BA: Lancheng Qin <qlc19@mails.tsinghua.edu.cn>; =
Tao Lin <lintao@h3c.com>; Yunan Gu <guyunan@huawei.com>; Dan Li =
<tolidan@tsinghua.edu.cn>; Jianping Wu <jianping@cernet.edu.cn>
=E4=B8=BB=E9=A2=98: Confirm submission of I-D =
draft-li-sava-intra-domain-use-cases


Hi,

The IETF datatracker draft submission service has received your draft =
draft-li-sava-intra-domain-use-cases-00, and requires a confirmation =
step in order to be able to complete the posting of the draft.
Please follow this link to the page where you can confirm the posting:

https://datatracker.ietf.org/submit/status/113356/confirm/3a24c6e0beb875a=
765fd3e2a3cf1d465/


Best regards,

	The IETF Secretariat
	through the draft submission service



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From: Jen Linkova <furry13@gmail.com>
Date: Tue, 28 Jul 2020 23:05:34 +1000
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Subject: [OPSEC] OpSec WGLC for draft-ietf-opsec-ns-impact
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This email starts the WG Last Call for draft-ietf-opsec-ns-impact ,

Impact of TLS 1.3 to Operational Network Security Practices,

https://datatracker.ietf.org/doc/draft-ietf-opsec-ns-impact/.

Taking into account  IETF108, the WGLC is extended to 3 weeks and ends
on Aug 18th, 23:59:59 UTC.

Please review the document and express your support or concerns/comments.

Thanks!

-- 
SY, Jen Linkova aka Furry on behalf of the OpSec Chairs.


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From: tom petch <ietfa@btconnect.com>
To: Jen Linkova <furry13@gmail.com>, opsec WG <opsec@ietf.org>
CC: "tls@ietf.org" <tls@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/opsec/XWCHB-Zsv17hnFE584gU4wiGxHM>
Subject: Re: [OPSEC] OpSec WGLC for draft-ietf-opsec-ns-impact
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From: OPSEC <opsec-bounces@ietf.org> on behalf of Jen Linkova <furry13@gmai=
l.com>=0A=
Sent: 28 July 2020 14:05=0A=
=0A=
This email starts the WG Last Call for draft-ietf-opsec-ns-impact ,=0A=
=0A=
Impact of TLS 1.3 to Operational Network Security Practices,=0A=
=0A=
https://datatracker.ietf.org/doc/draft-ietf-opsec-ns-impact/.=0A=
=0A=
Taking into account  IETF108, the WGLC is extended to 3 weeks and ends=0A=
on Aug 18th, 23:59:59 UTC.=0A=
=0A=
Please review the document and express your support or concerns/comments.=
=0A=
=0A=
<tp>=0A=
OPPOSE (yes, I am shouting)=0A=
=0A=
This is nowhere near ready and putting it forward so soon is ... well ludic=
rous comes to mind.=0A=
=0A=
After WG adoption, comments were made to which there was no acknowledgement=
, no response,  I was about to oppose the adoption of the other I-D from th=
ese authors on the grounds that until they respond to comments nothing else=
 should happen because when they do there are more comments waiting to be a=
ired.  I am still of that view.=0A=
=0A=
I do see that a revised I-D has just appeared in among the thousand or so I=
-D that appear around the time of an IETF meeting, a timing that I sometime=
s think is designed to let it slip through unnoticed.  Given all those othe=
r I-D - silly authors - it may be more than three weeks before I get my tho=
ughts together.=0A=
=0A=
Tom Petch=0A=
=0A=
Thanks!=0A=
=0A=
--=0A=
SY, Jen Linkova aka Furry on behalf of the OpSec Chairs.=0A=
=0A=
_______________________________________________=0A=
OPSEC mailing list=0A=
OPSEC@ietf.org=0A=
https://www.ietf.org/mailman/listinfo/opsec=0A=


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From: tom petch <ietfa@btconnect.com>
To: "Nancy Cam-Winget (ncamwing)" <ncamwing=40cisco.com@dmarc.ietf.org>, Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
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Thread-Topic: [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Archived-At: <https://mailarchive.ietf.org/arch/msg/opsec/97zzZ4yl5b1zL1fRpMJ1qGWE-VM>
Subject: Re: [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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From: "Eric Wang (ejwang)" <ejwang@cisco.com>
To: tom petch <ietfa@btconnect.com>
CC: "opsec@ietf.org" <opsec@ietf.org>
Thread-Topic: [OPSEC] I-D Action: draft-ietf-opsec-ns-impact-00.txt
Thread-Index: AQHWSboC9fvjf1iAy0uvGMy6aE7Ki6jnopMAgDYKT4A=
Date: Tue, 28 Jul 2020 20:46:29 +0000
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From: "Eric Wang (ejwang)" <ejwang@cisco.com>
To: Martin Thomson <mt@lowentropy.net>
CC: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, OPSEC <opsec@ietf.org>,  "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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From: Jen Linkova <furry13@gmail.com>
Date: Wed, 29 Jul 2020 08:14:38 +1000
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On Wed, Jul 29, 2020 at 2:07 AM tom petch <ietfa@btconnect.com> wrote:
>> This email starts the WG Last Call for draft-ietf-opsec-ns-impact ,
>> Impact of TLS 1.3 to Operational Network Security Practices,
>> https://datatracker.ietf.org/doc/draft-ietf-opsec-ns-impact/.

> <tp>
> OPPOSE (yes, I am shouting)
>
> This is nowhere near ready and putting it forward so soon is ... well lud=
icrous comes to mind.
>
> After WG adoption, comments were made to which there was no acknowledgeme=
nt, no response,  I was about to oppose the adoption of the other I-D from =
these authors on the grounds that until they respond to comments nothing el=
se should happen because when they do there are more comments waiting to be=
 aired.  I am still of that view.

Sorry, it's partially my fault. I did explicitly ask the authors to
address your comments and submit a new version. I should have
double-checked that the new version incorporates the feedback.

Dear authors, would you be able to address Tom's comments ASAP so the
new revision can be reviewed during the WGLC?

> I do see that a revised I-D has just appeared in among the thousand or so=
 I-D that appear around the time of an IETF meeting, a timing that I someti=
mes think is designed to let it slip through unnoticed.  Given all those ot=
her I-D - silly authors - it may be more than three weeks before I get my t=
houghts together.

Just to clarify: would you prefer not to have the WGLC around IETF
weeks at all?

--=20
SY, Jen Linkova aka Furry


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From: "Nancy Cam-Winget (ncamwing)" <ncamwing@cisco.com>
To: Jen Linkova <furry13@gmail.com>, tom petch <ietfa@btconnect.com>
CC: opsec WG <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] [OPSEC] OpSec WGLC for draft-ietf-opsec-ns-impact
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Subject: Re: [OPSEC] [TLS]  OpSec WGLC for draft-ietf-opsec-ns-impact
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--_000_F3C9D532C8ED4843A03256D90DB9630Cciscocom_--


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Subject: [OPSEC] I-D Action: draft-ietf-opsec-ns-impact-02.txt
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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 Operational Security Capabilities for IP Network Infrastructure WG of the IETF.

        Title           : Impact of TLS 1.3 to Operational Network Security Practices
        Authors         : Nancy Cam-Winget
                          Eric Wang
                          Roman Danyliw
                          Roelof DuToit
	Filename        : draft-ietf-opsec-ns-impact-02.txt
	Pages           : 17
	Date            : 2020-07-28

Abstract:
   Network-based security solutions are used by enterprises, the public
   sector, internet-service providers, and cloud-service providers to
   both complement and enhance host-based security solutions.  As TLS is
   a widely deployed protocol to secure communication, these network-
   based security solutions must necessarily interact with it.  This
   document describes this interaction for current operational security
   practices and notes the impact of TLS 1.3 on them.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-opsec-ns-impact/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-opsec-ns-impact-02
https://datatracker.ietf.org/doc/html/draft-ietf-opsec-ns-impact-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-opsec-ns-impact-02


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/



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From: Watson Ladd <watsonbladd@gmail.com>
Date: Tue, 28 Jul 2020 20:23:48 -0400
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To: "Eric Wang (ejwang)" <ejwang=40cisco.com@dmarc.ietf.org>
Cc: Stephen Farrell <stephen.farrell@cs.tcd.ie>, Jen Linkova <furry13@gmail.com>,  OpSec Chairs <opsec-chairs@ietf.org>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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On Mon, Jul 27, 2020, 1:15 AM Eric Wang (ejwang) <ejwang=3D
40cisco.com@dmarc.ietf.org> wrote:

> Hi Stephen,
>
> Thanks for your feedback.  I=E2=80=99d like to clarify, given the reality=
 today
> that CDN/load balancers and enterprises deploy TLS proxy, this draft is
> merely to lay out a baseline guidance to the implementation and
> operation[1].  It is not meant to analyze "use and abuse" or "pros and
> cons", for which there were many discussions and publications in the past
> and the draft references some of them.
>

CDNs are usually aware of application level semantics and have some
interesting security problems when not.

There's no generic safe way to terminate TLS, and that's a real problem for
this draft: it needs to be specific to certain use cases.


> Given the progression of TLS and its wide adoption, the use of TLS proxy
> is also becoming a practice and is growing in enterprise/CDN.  We felt it=
=E2=80=99s
> a good thing for the community to define a set of best practices for
> practitioners to reference when implementing and operating TLS proxy.
> Without one, TLS deployments would be negatively impacted.  Also, given
> some of the implementation inconsistencies noted during the TLS 1.3
> evolution, we felt a bcp guide could help the community moving forward.
> That=E2=80=99s the purpose of this draft.
>

We've seen middlebox writers ignore black letter extensibility requirements
in the existing RFCs and adopt broken patterns before. Why will another
draft help?


> Best,
> -Eric
>
> [1] https://tools.ietf.org/html/draft-wang-opsec-tls-proxy-bp-00#section-=
1
>
>
> On Jul 25, 2020, at 7:07 AM, Stephen Farrell <stephen.farrell@cs.tcd.ie>
> wrote:
>
>
> I oppose adoption. While there could be some minor benefit
> in documenting the uses and abuses seen when mitm'ing tls,
> I doubt that the effort to ensure a balanced document is at
> all worthwhile. The current draft is too far from what it'd
> need to be to be adopted.
>
> Send to ISE.
>
> S.
>
> On 23/07/2020 02:30, Jen Linkova wrote:
>
> One thing to add here: the chairs would like to hear active and
> explicit support of the adoption. So please speak up if you believe
> the draft is useful and the WG shall work on getting it published.
>
> On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica
> <rbonica=3D40juniper.net@dmarc.ietf.org> wrote:
>
>
> Folks,
>
>
>
> This email begins a Call For Adoption on draft-wang-opsec-tls-proxy-bp.
>
>
>
> Please send comments to opsec@ietf.org by August 3, 2020.
>
>
>
>                                                                Ron
>
>
>
>
> Juniper Business Use Only
>
> _______________________________________________
> OPSEC mailing list
> OPSEC@ietf.org
> https://www.ietf.org/mailman/listinfo/opsec
>
>
>
>
> --
> SY, Jen Linkova aka Furry
>
> _______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls
>
> <0x5AB2FAF17B172BEA.asc>_______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls
>
>
> _______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls
>

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

<div dir=3D"auto"><div><br><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Mon, Jul 27, 2020, 1:15 AM Eric Wang (ejwang) &lt;e=
jwang=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org" rel=3D"noreferrer nor=
eferrer noreferrer" target=3D"_blank">40cisco.com@dmarc.ietf.org</a>&gt; wr=
ote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;=
border-left:1px #ccc solid;padding-left:1ex">



<div style=3D"word-wrap:break-word;line-break:after-white-space">
<div dir=3D"auto" style=3D"word-wrap:break-word;line-break:after-white-spac=
e">
<div>Hi Stephen,=C2=A0<br>
=C2=A0<br>
Thanks for your feedback.=C2=A0 I=E2=80=99d like to clarify, given the real=
ity today that CDN/load balancers and enterprises deploy TLS proxy, this dr=
aft is merely to lay out a baseline guidance to the implementation=C2=A0and=
 operation[1].=C2=A0 It is not meant to analyze &quot;use and
 abuse&quot; or &quot;pros and cons&quot;, for which there were many discus=
sions and publications in the past and the draft references some of them.<b=
r></div></div></div></blockquote></div></div><div dir=3D"auto"><br></div><d=
iv dir=3D"auto">CDNs are usually aware of application level semantics and h=
ave some interesting security problems when not.</div><div dir=3D"auto"><br=
></div><div dir=3D"auto">There&#39;s no generic safe way to terminate TLS, =
and that&#39;s a real problem for this draft: it needs to be specific to ce=
rtain use cases.</div><div dir=3D"auto"><br></div><div dir=3D"auto"><div cl=
ass=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0=
 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style=3D"word-wrap:=
break-word;line-break:after-white-space"><div dir=3D"auto" style=3D"word-wr=
ap:break-word;line-break:after-white-space"><div>
<br>
Given the progression of TLS and its wide adoption, the use of TLS proxy is=
 also becoming a practice and is growing in enterprise/CDN.=C2=A0 We felt i=
t=E2=80=99s a good thing for the community to define a set of best=C2=A0pra=
ctices for practitioners to reference when implementing
 and operating TLS proxy.=C2=A0 Without one, TLS deployments would be negat=
ively impacted.=C2=A0 Also,=C2=A0given some of the implementation inconsist=
encies noted during the TLS 1.3 evolution, we felt a bcp guide could help t=
he community moving forward.=C2=A0 That=E2=80=99s the purpose
 of this draft.<br></div></div></div></blockquote></div></div><div dir=3D"a=
uto"><br></div><div dir=3D"auto">We&#39;ve seen middlebox writers ignore bl=
ack letter extensibility requirements in the existing RFCs and adopt broken=
 patterns before. Why will another draft help?</div><div dir=3D"auto"><br><=
/div><div dir=3D"auto"><div class=3D"gmail_quote"><blockquote class=3D"gmai=
l_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left=
:1ex"><div style=3D"word-wrap:break-word;line-break:after-white-space"><div=
 dir=3D"auto" style=3D"word-wrap:break-word;line-break:after-white-space"><=
div>
<br>
</div>
<div>Best,</div>
<div>-Eric</div>
<div><br>
</div>
<div>[1]=C2=A0<a href=3D"https://tools.ietf.org/html/draft-wang-opsec-tls-p=
roxy-bp-00#section-1" rel=3D"noreferrer noreferrer noreferrer noreferrer" t=
arget=3D"_blank">https://tools.ietf.org/html/draft-wang-opsec-tls-proxy-bp-=
00#section-1</a><br>
<div><br>
</div>
<div><br>
<blockquote type=3D"cite">
<div>On Jul 25, 2020, at 7:07 AM, Stephen Farrell &lt;<a href=3D"mailto:ste=
phen.farrell@cs.tcd.ie" rel=3D"noreferrer noreferrer noreferrer noreferrer"=
 target=3D"_blank">stephen.farrell@cs.tcd.ie</a>&gt; wrote:</div>
<br>
<div><br style=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-sty=
le:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal=
;text-align:start;text-indent:0px;text-transform:none;white-space:normal;wo=
rd-spacing:0px;text-decoration:none">
<span style=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:=
normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;te=
xt-align:start;text-indent:0px;text-transform:none;white-space:normal;word-=
spacing:0px;text-decoration:none;float:none;display:inline!important">I
 oppose adoption. While there could be some minor benefit</span><br style=
=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:normal;font=
-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:st=
art;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px=
;text-decoration:none">
<span style=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:=
normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;te=
xt-align:start;text-indent:0px;text-transform:none;white-space:normal;word-=
spacing:0px;text-decoration:none;float:none;display:inline!important">in
 documenting the uses and abuses seen when mitm&#39;ing tls,</span><br styl=
e=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:normal;fon=
t-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:s=
tart;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0p=
x;text-decoration:none">
<span style=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:=
normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;te=
xt-align:start;text-indent:0px;text-transform:none;white-space:normal;word-=
spacing:0px;text-decoration:none;float:none;display:inline!important">I
 doubt that the effort to ensure a balanced document is at</span><br style=
=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:normal;font=
-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:st=
art;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px=
;text-decoration:none">
<span style=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:=
normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;te=
xt-align:start;text-indent:0px;text-transform:none;white-space:normal;word-=
spacing:0px;text-decoration:none;float:none;display:inline!important">all
 worthwhile. The current draft is too far from what it&#39;d</span><br styl=
e=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:normal;fon=
t-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:s=
tart;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0p=
x;text-decoration:none">
<span style=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:=
normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;te=
xt-align:start;text-indent:0px;text-transform:none;white-space:normal;word-=
spacing:0px;text-decoration:none;float:none;display:inline!important">need
 to be to be adopted.</span><br style=3D"font-family:LucidaSans-Typewriter;=
font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:norma=
l;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:non=
e;white-space:normal;word-spacing:0px;text-decoration:none">
<br style=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:no=
rmal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text=
-align:start;text-indent:0px;text-transform:none;white-space:normal;word-sp=
acing:0px;text-decoration:none">
<span style=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:=
normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;te=
xt-align:start;text-indent:0px;text-transform:none;white-space:normal;word-=
spacing:0px;text-decoration:none;float:none;display:inline!important">Send
 to ISE.</span><br style=3D"font-family:LucidaSans-Typewriter;font-size:14p=
x;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spac=
ing:normal;text-align:start;text-indent:0px;text-transform:none;white-space=
:normal;word-spacing:0px;text-decoration:none">
<br style=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:no=
rmal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text=
-align:start;text-indent:0px;text-transform:none;white-space:normal;word-sp=
acing:0px;text-decoration:none">
<span style=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:=
normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;te=
xt-align:start;text-indent:0px;text-transform:none;white-space:normal;word-=
spacing:0px;text-decoration:none;float:none;display:inline!important">S.</s=
pan><br style=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-styl=
e:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;=
text-align:start;text-indent:0px;text-transform:none;white-space:normal;wor=
d-spacing:0px;text-decoration:none">
<br style=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:no=
rmal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text=
-align:start;text-indent:0px;text-transform:none;white-space:normal;word-sp=
acing:0px;text-decoration:none">
<span style=3D"font-family:LucidaSans-Typewriter;font-size:14px;font-style:=
normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;te=
xt-align:start;text-indent:0px;text-transform:none;white-space:normal;word-=
spacing:0px;text-decoration:none;float:none;display:inline!important">On
 23/07/2020 02:30, Jen Linkova wrote:</span><br style=3D"font-family:Lucida=
Sans-Typewriter;font-size:14px;font-style:normal;font-variant-caps:normal;f=
ont-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;te=
xt-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"=
>
<blockquote type=3D"cite" style=3D"font-family:LucidaSans-Typewriter;font-s=
ize:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;lett=
er-spacing:normal;text-align:start;text-indent:0px;text-transform:none;whit=
e-space:normal;word-spacing:0px;text-decoration:none">
One thing to add here: the chairs would like to hear active and<br>
explicit support of the adoption. So please speak up if you believe<br>
the draft is useful and the WG shall work on getting it published.<br>
<br>
On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica<br>
&lt;<a href=3D"mailto:rbonica=3D40juniper.net@dmarc.ietf.org" rel=3D"norefe=
rrer noreferrer noreferrer noreferrer" target=3D"_blank">rbonica=3D40junipe=
r.net@dmarc.ietf.org</a>&gt; wrote:<br>
<blockquote type=3D"cite"><br>
Folks,<br>
<br>
<br>
<br>
This email begins a Call For Adoption on draft-wang-opsec-tls-proxy-bp.<br>
<br>
<br>
<br>
Please send comments to <a href=3D"mailto:opsec@ietf.org" rel=3D"noreferrer=
 noreferrer noreferrer noreferrer" target=3D"_blank">opsec@ietf.org</a> by =
August 3, 2020.<br>
<br>
<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0Ron<br>
<br>
<br>
<br>
<br>
Juniper Business Use Only<br>
<br>
_______________________________________________<br>
OPSEC mailing list<br>
<a href=3D"mailto:OPSEC@ietf.org" rel=3D"noreferrer noreferrer noreferrer n=
oreferrer" target=3D"_blank">OPSEC@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/opsec" rel=3D"noreferrer n=
oreferrer noreferrer noreferrer" target=3D"_blank">https://www.ietf.org/mai=
lman/listinfo/opsec</a><br>
</blockquote>
<br>
<br>
<br>
--<br>
SY, Jen Linkova aka Furry<br>
<br>
_______________________________________________<br>
TLS mailing list<br>
<a href=3D"mailto:TLS@ietf.org" rel=3D"noreferrer noreferrer noreferrer nor=
eferrer" target=3D"_blank">TLS@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/tls" rel=3D"noreferrer nor=
eferrer noreferrer noreferrer" target=3D"_blank">https://www.ietf.org/mailm=
an/listinfo/tls</a><br>
<br>
</blockquote>
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Cc: Martin Thomson <mt@lowentropy.net>, Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>,  OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
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On Tue, Jul 28, 2020 at 2:19 PM Eric Wang (ejwang) <ejwang=3D
40cisco.com@dmarc.ietf.org> wrote:

> Thank you for the detailed comments.
>
> The scope of the document is limited to proxy at the TLS layer.
> Explicitly out of the scope is inspection of the proxied record data.
> Will clean up derivations from this scope.
>
> It was the intention to cover selective proxying however, because that is
> a practical requirement for an actual deployment.  The intention was to
> discuss the TLS layer attributes (e.g. SNI, Server Cert) that could be us=
ed
> as input for the decision.  The document also stated the requirement to
> gracefully remove the proxy from the session when needed (and possible).
> But the criteria for selective proxying decision, being compliance,
> privacy, risk level,... are out of the scope.  The decision making often
> falls under the larger =E2=80=9Cpolicy=E2=80=9D domain and is controlled =
at system level
> outside of the proxy.  It also left out discussion on the detailed
> mechanism which was deemed as implementation specific.
>
> In any case, the proxy has to conduct selective proxying in a safe,
> non-disruptive manner. This may require more design work as you pointed
> out.  The document could describe possible mechanisms so that an acceptab=
le
> practice could be discussed.  We are open to other ways to shape it.
>

An acceptable practice MUST include not violating the protocol invariants
in RFC 8446. It is not possible for a proxy to obey the protocol invariants
and selectively proxy based on the contents of the TLS handshake between
the proxy and the server a client wishes to connect to.

>
> More inline...
>
>
> Probably the worst problem is rooted in Section 5.1.  The introduction
> establishes this as being about proxying, but there are several places th=
at
> talk about not-proxying sometimes.
>
> Selective non-proxying opens the document up to a whole new set of
> problems that arise from poor designs for deciding not to proxy.  There i=
s
> not nearly enough detail here to address this problem properly.  A "good"
> design for selective TLS proxying does not seem to be the basis of the
> recommendations.  I'll give a few examples of problems.
>
> From the Section 4.8 again:
>
>
> the TLS proxy MUST conduct proper TLS protocol checks to avoid false
> identification of TLS handshakes, while taking special care not to
> contribute to protocol ossification.
>
>
> This practice has been directly responsible for more ossification than
> intermediation, no matter what qualification exists.
>
> If per-destination not-proxying is required, the proxy can connect to a
> server, determine that the server is on a non-proxy list, and then comple=
te
> the handshake with the client (with a caveat regarding ECH here).  I can
> guess why this doesn't happen (it's expensive and see also Section 5.4),
> but that doesn't excuse the practice.
>
> The following text from Section 5.3 is deeply problematic:
>
>   A decryption policy decision MAY be made based on the server
>   certificate or other trustworthy parameters.  To verify possession of
>   private keys that are associated with a particular server
>   certificate, the proxy SHOULD complete an out-of-band TLS handshake
>   with the same TLS server IP address and TCP port as targeted by the
>   TLS client.
>
> It is possible that the authors misunderstand how TLS works, but this
> check won't work.  Not only because TLS 1.3 encrypts information, but
> because this is only necessary if the proxy forwards a ClientHello from t=
he
> client to the server.  At that point, it is too late and the damage has
> been done (see Andrei's review).
>
>
>
> Unless I misunderstood it, the document is suggesting the same as you
> listed.  Basically, the proxy makes a separate connection to the server a=
s
> a client (=E2=80=9Cout-of-band=E2=80=9D wrt to the originating client-ser=
ver connection),
> retrieves the server=E2=80=99s certificate from the proxy-server handshak=
e, and
> determines whether the server is on a non-proxying list or not.  If on th=
e
> list, the proxy forwards the originating client CH as is to the server, a=
nd
> steps aways from the originating client-server handshake.
>

The proxy MUST generate a fresh ClientHello when doing this (something
Andrei and I previously mentioned). When the proxy makes its separate
connection to the server, the server can behave differently when responding
to the proxy compared to when it responds to the client, and could present
itself to the proxy as something innocuous that should not be proxied.
Assuming at this point that the proxy has held onto the client's
ClientHello (waiting for the response from the server to the proxy's
ClientHello), the proxy decides either to intercept this connection or
allow the client's ClientHello to go through to the server. When the proxy
allows the client's ClientHello to go through to the server (without
interception), there's no guarantee that the server will respond to the
client the same way it did to the proxy, or even that the identity the
server presented to the proxy is the server's real identity.

If the proxy copies extensions unknown to it from the client's ClientHello
to its own, then it will not be able to parse the response from the server
when the server acts on those unknown extensions. This caused a year of
delay in finishing TLS 1.3, and is bad for everyone. A malicious client and
cooperating server don't even need to use an extensibility point unknown to
the proxy to evade a proxy selectively terminating connections based on the
TLS handshake between the proxy and server.

This sort of selective proxying is fundamentally broken and should not be
recommended as a best practice.

>
> There are additional considerations in this approach (latency etc.). The
> document intentionally left out the details to implementations, but could
> also cover them if needed.
>
>
>
>
> There are a bunch of places where pure proxying - as described in the
> introduction - is not assumed.  This leads to the same problems already
> cited.  For instance, in Section 4.2:
>
> The proxy MAY remove cipher suites from a client-initiated Client Hello
> message, add new cipher suites, and re-order them in the proxy-initiated
> Client Hello message.
>
>
> Will clean up those texts based on this and other discussions.
>
> Best,
> -Eric
>
>
>
>
> _______________________________________________
> OPSEC mailing list
> OPSEC@ietf.org
> https://www.ietf.org/mailman/listinfo/opsec
>
>
> _______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls
>

--00000000000073d73c05ab89babd
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jul 28, 2020 at 2:19 PM Eric =
Wang (ejwang) &lt;ejwang=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org">40=
cisco.com@dmarc.ietf.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail=
_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204=
,204);padding-left:1ex">



<div style=3D"overflow-wrap: break-word;">
<div dir=3D"auto" style=3D"overflow-wrap: break-word;">
Thank you for the detailed comments.
<div><br>
</div>
<div>The scope of the document is limited to proxy at the TLS layer.=C2=A0 =
Explicitly out of the scope is inspection of the proxied record data. =C2=
=A0 Will clean up derivations from this scope.</div>
<div><br>
</div>
<div>It was the intention to cover selective proxying however, because that=
 is a practical requirement for an actual deployment.=C2=A0 The intention w=
as to discuss the TLS layer attributes (e.g. SNI, Server Cert) that could b=
e used as input for the decision.
 =C2=A0The document also stated the requirement to gracefully remove the pr=
oxy from the session when needed (and possible).=C2=A0 But the criteria for=
 selective proxying decision, being compliance, privacy, risk level,... are=
 out of the scope.=C2=A0 The decision making often
 falls under the larger =E2=80=9Cpolicy=E2=80=9D domain and is controlled a=
t system level outside of the proxy.=C2=A0 It also left out discussion on t=
he detailed mechanism which was deemed as implementation specific.</div>
<div><br>
</div>
<div>In any case, the proxy has to conduct selective proxying in a safe, no=
n-disruptive manner. This may require more design work as you pointed out.=
=C2=A0 The document could describe possible mechanisms so that an acceptabl=
e practice could be discussed.
 =C2=A0We are open to other ways to shape it.</div></div></div></blockquote=
><div><br></div><div>An acceptable practice MUST include not violating the =
protocol invariants in RFC 8446. It is not possible for a proxy to obey the=
 protocol invariants and selectively proxy based on the contents of the TLS=
 handshake between the proxy and the server a client wishes to connect to.=
=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style=3D=
"overflow-wrap: break-word;"><div dir=3D"auto" style=3D"overflow-wrap: brea=
k-word;">
<div><br>
</div>
<div>
<div>More inline...</div>
<div><blockquote type=3D"cite"><div><div><br>
Probably the worst problem is rooted in Section 5.1.=C2=A0 The introduction=
 establishes this as being about proxying, but there are several places tha=
t talk about not-proxying sometimes.<br>
<br>
Selective non-proxying opens the document up to a whole new set of problems=
 that arise from poor designs for deciding not to proxy.=C2=A0 There is not=
 nearly enough detail here to address this problem properly.=C2=A0 A &quot;=
good&quot; design for selective TLS proxying does not
 seem to be the basis of the recommendations.=C2=A0 I&#39;ll give a few exa=
mples of problems.<br>
<br>
<blockquote type=3D"cite">From the Section 4.8 again:<br>
</blockquote>
<br>
<blockquote type=3D"cite">the TLS proxy MUST conduct proper TLS protocol ch=
ecks to avoid false identification of TLS handshakes, while taking special =
care not to contribute to protocol ossification. =C2=A0<br>
</blockquote>
<br>
This practice has been directly responsible for more ossification than inte=
rmediation, no matter what qualification exists. =C2=A0<br>
<br>
If per-destination not-proxying is required, the proxy can connect to a ser=
ver, determine that the server is on a non-proxy list, and then complete th=
e handshake with the client (with a caveat regarding ECH here).=C2=A0 I can=
 guess why this doesn&#39;t happen (it&#39;s
 expensive and see also Section 5.4), but that doesn&#39;t excuse the pract=
ice.<br>
<br>
The following text from Section 5.3 is deeply problematic:<br>
<br>
=C2=A0=C2=A0A decryption policy decision MAY be made based on the server<br=
>
=C2=A0=C2=A0certificate or other trustworthy parameters.=C2=A0 To verify po=
ssession of<br>
=C2=A0=C2=A0private keys that are associated with a particular server<br>
=C2=A0=C2=A0certificate, the proxy SHOULD complete an out-of-band TLS hands=
hake<br>
=C2=A0=C2=A0with the same TLS server IP address and TCP port as targeted by=
 the<br>
=C2=A0=C2=A0TLS client.<br>
<br>
It is possible that the authors misunderstand how TLS works, but this check=
 won&#39;t work.=C2=A0 Not only because TLS 1.3 encrypts information, but b=
ecause this is only necessary if the proxy forwards a ClientHello from the =
client to the server.=C2=A0 At that point, it
 is too late and the damage has been done (see Andrei&#39;s review).<br>
</div>
</div>
</blockquote>
<div><br>
</div>
<div><br>
</div>
<div>Unless I misunderstood it, the document is suggesting the same as you =
listed.=C2=A0 Basically, the proxy makes a separate connection to the serve=
r as a client (=E2=80=9Cout-of-band=E2=80=9D wrt to the originating client-=
server connection), retrieves the server=E2=80=99s certificate
 from the proxy-server handshake, and determines whether the server is on a=
 non-proxying list or not.=C2=A0 If on the list, the proxy forwards the ori=
ginating client CH as is to the server, and steps aways from the originatin=
g client-server handshake.</div></div></div></div></div></blockquote><div><=
br></div><div>The proxy MUST generate a fresh ClientHello when doing this (=
something Andrei and I previously mentioned). When the proxy makes its sepa=
rate connection to the server, the server can behave differently when respo=
nding to the proxy compared to when it responds to the client, and could pr=
esent itself to the proxy as something innocuous=C2=A0that should not be pr=
oxied. Assuming at this point that the proxy has held onto the client&#39;s=
 ClientHello (waiting for the response from the server to the proxy&#39;s C=
lientHello), the proxy decides either to intercept this connection or allow=
 the client&#39;s ClientHello to go through to the server. When the proxy a=
llows the client&#39;s ClientHello to go through to the server (without int=
erception), there&#39;s no guarantee that the server will respond to the cl=
ient the same way it did to the proxy, or even that the identity the server=
 presented to the proxy is the server&#39;s real identity.<br></div><div><b=
r></div><div>If the proxy copies extensions unknown to it from the client&#=
39;s ClientHello to its own, then it will not be able to parse the response=
 from the server when the server acts on those unknown extensions. This cau=
sed a year of delay in finishing TLS 1.3, and is bad for everyone. A malici=
ous client and cooperating server don&#39;t even need to use an extensibili=
ty point unknown to the proxy to evade a proxy selectively terminating conn=
ections based on the TLS handshake between the proxy and server.</div><div>=
<br></div><div>This sort of selective proxying is fundamentally broken and =
should not be recommended as a best practice.</div><blockquote class=3D"gma=
il_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,2=
04,204);padding-left:1ex"><div style=3D"overflow-wrap: break-word;"><div di=
r=3D"auto" style=3D"overflow-wrap: break-word;"><div><div>
<div><br>
</div>
<div>There are additional considerations in this approach (latency etc.). T=
he document intentionally left out the details to implementations, but coul=
d also cover them if needed.</div>
<div><br>
</div>
<div><br>
</div>
<blockquote type=3D"cite">
<div>
<div><br>
<br>
There are a bunch of places where pure proxying - as described in the intro=
duction - is not assumed.=C2=A0 This leads to the same problems already cit=
ed.=C2=A0 For instance, in Section 4.2:<br>
<br>
<blockquote type=3D"cite">The proxy MAY remove cipher suites from a client-=
initiated Client Hello message, add new cipher suites, and re-order them in=
 the proxy-initiated Client Hello message.<br>
</blockquote>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>Will clean up those texts based on this and other discussions.</div>
<div><br>
</div>
<div>Best,</div>
<div>-Eric</div>
<div><br>
</div>
<div><br>
</div>
<br>
<blockquote type=3D"cite">
<div>
<div><br>
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From: Rob Sayre <sayrer@gmail.com>
Date: Tue, 28 Jul 2020 17:54:20 -0700
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To: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Oppose.

Nothing new to add.

thanks,
Rob


On Sun, Jul 19, 2020 at 10:35 AM Ron Bonica <rbonica=
40juniper.net@dmarc.ietf.org> wrote:

> Folks,
>
>
>
> This email begins a Call For Adoption on draft-wang-opsec-tls-proxy-bp
> <https://datatracker.ietf.org/doc/draft-wang-opsec-tls-proxy-bp/>.
>
>
>
> Please send comments to opsec@ietf.org <opsec@ietf..org> by August 3,
> 2020.
>
>
>
>                                                                 Ron
>
>
>
> Juniper Business Use Only
> _______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls
>

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<div dir=3D"ltr">Oppose.<div><br></div><div>Nothing new to add.</div><div><=
br></div><div>thanks,</div><div>Rob</div><div><br></div></div><br><div clas=
s=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Jul 19, 202=
0 at 10:35 AM Ron Bonica &lt;rbonica=3D<a href=3D"mailto:40juniper.net@dmar=
c.ietf.org">40juniper.net@dmarc.ietf.org</a>&gt; wrote:<br></div><blockquot=
e class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px s=
olid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal">Folks,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">This email begins a Call For Adoption on <a href=3D"=
https://datatracker.ietf.org/doc/draft-wang-opsec-tls-proxy-bp/" target=3D"=
_blank">
draft-wang-opsec-tls-proxy-bp</a>.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Please send comments to <a href=3D"mailto:opsec@ietf=
..org" target=3D"_blank">opsec@ietf.org</a> by August 3, 2020.<u></u><u></u=
></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Ron<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<br>
<p align=3D"Center" style=3D"margin:0px"><span style=3D"font-size:7pt;font-=
family:Calibri;color:rgb(0,0,0)">Juniper Business Use Only</span></p>
</div>
</div>

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</blockquote></div>

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To: Jen Linkova <furry13@gmail.com>, opsec WG <opsec@ietf.org>
Cc: tls@ietf.org
Message-ID: <8fbc4a58-4f20-7fa5-99e8-fda6fcec76ee@cs.tcd.ie>
Subject: Re: [TLS] OpSec WGLC for draft-ietf-opsec-ns-impact
References: <CAFU7BAT9LxVJJxE8OhhzTXgrbS6SHYb7U9LQdMvOZQQREC2Etg@mail.gmail.com>
In-Reply-To: <CAFU7BAT9LxVJJxE8OhhzTXgrbS6SHYb7U9LQdMvOZQQREC2Etg@mail.gmail.com>

--KCd8EYWUZ6FDBl4qfWHGYlKp9U4i1NNEt
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IMO this document is absolutely not ready to become an
RFC. It basically ignores the purpose of TLS which is
to prevent exactly the MITM attacks being espoused
here (IMO). In ignoring that, it ignores all of the bad
consequences of such MITM attacks.

As evidence:

"To proxy a TLS session, a TLS Proxy must be able to
present a valid X.509 certificate to the TLS client to appear as a valid
TLS Server;"

That assumes that an x.509 data structure created on
the fly, with no interaction with the named subject
can be "valid." That is antithetical to the intent of
x.509 and TLS.

That is such a fundamental misconstruction of x.509,
of PKI and of TLS that it alone means that the draft
is sufficiently inaccurate to be unworthy of publication
as an IETF consensus RFC.

If really necessary I'm sure many other related
problems can and will be found in the text. I hope
that waste of effort is not needed.

The basic problem here seem to me to be an effort to
justify (and perhaps promote?) existing MITM practices
without fairly or accurately describing their downsides.

As I also commented on a related document: the effort
expended on attempts to garner IETF consensus on such
text is not worthwhile.

If someone actually wrote truly objective text on the
reasons why people deploy TLS MITM attack boxes and on
the real downsides that would be different. This is
nowhere near such objective text.

My recommendation: declare this document dead. And
don't bother with the supposed BCP. Instead, try to
find someone who can write an evidence-based description
of the falsifiable pros and cons of these TLS MITM
products. And then send that to the ISE.

S.

PS: I'm sure someone will claim that being logical about
this "ignores reality" so just to get in a comment on
that ahead of time: reality includes lots of bad
engineering - if and when we want to document that, there
is an onus on us to say why it is bad and how to do better.
That would require offering evidence as to the efficacy
or otherwise of TLS MTIM boxes when compared to the
benefits of using TLS as-designed. That evidence, in my
experience, never seems to actually be offered by those
who espouse these MITM attack products.


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From: Rob Sayre <sayrer@gmail.com>
Date: Tue, 28 Jul 2020 18:52:04 -0700
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Subject: Re: [OPSEC] [TLS] OpSec WGLC for draft-ietf-opsec-ns-impact
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On Tue, Jul 28, 2020 at 6:13 PM Stephen Farrell <stephen.farrell@cs.tcd.ie>
wrote:

>
> PS: I'm sure someone will claim that being logical about
> this "ignores reality" so just to get in a comment on
> that ahead of time: reality includes lots of bad
> engineering...
>

I agree with this comment. In particular, I object to phrases along the
lines of:

"TLS 1.3 considerations: reduced effectiveness"

Ignoring their aims, I don't think these products work, and I don't think
the IETF should publish documents that make it seem like they do.

I would support an ISE submission.

thanks,
Rob

--00000000000022ac3505ab8ace0c
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<div dir=3D"ltr"><div dir=3D"ltr">On Tue, Jul 28, 2020 at 6:13 PM Stephen F=
arrell &lt;<a href=3D"mailto:stephen.farrell@cs.tcd.ie">stephen.farrell@cs.=
tcd.ie</a>&gt; wrote:<br></div><div class=3D"gmail_quote"><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><br>
PS: I&#39;m sure someone will claim that being logical about<br>
this &quot;ignores reality&quot; so just to get in a comment on<br>
that ahead of time: reality includes lots of bad<br>
engineering...<br></blockquote><div><br></div><div>I agree with this commen=
t. In particular, I object to phrases along the lines of:</div><div><br></d=
iv><div>&quot;TLS 1.3 considerations: reduced effectiveness&quot;</div><div=
><br></div><div>Ignoring their aims, I don&#39;t think these products work,=
 and I don&#39;t think the IETF should publish documents that make it seem =
like they do.</div><div><br></div><div>I would support an ISE submission.</=
div><div><br></div><div>thanks,</div><div>Rob</div><div><br></div></div></d=
iv>

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Date: Wed, 29 Jul 2020 13:26:13 +1000
From: "Martin Thomson" <mt@lowentropy.net>
To: "Eric Wang (ejwang)" <ejwang@cisco.com>
Cc: "Ron Bonica" <rbonica=40juniper.net@dmarc.ietf.org>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Hi Eric,

On Wed, Jul 29, 2020, at 07:18, Eric Wang (ejwang) wrote:
> In any case, the proxy has to conduct selective proxying in a safe, 
> non-disruptive manner. 

I will try to be clearer on this point.

This requires design work and this document is a poor vehicle for that.  It needs a separate document that documents the design, the properties of that design, and the assumptions that it requires to achieve those properties.

The TLS working group has decided not to undertake work in this area.  That TLS working group decision needs to be respected by other parts of the IETF.


From nobody Wed Jul 29 01:41:14 2020
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From: tom petch <ietfa@btconnect.com>
To: Jen Linkova <furry13@gmail.com>
CC: opsec WG <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [OPSEC] OpSec WGLC for draft-ietf-opsec-ns-impact
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Archived-At: <https://mailarchive.ietf.org/arch/msg/opsec/xBwpPRmjXwKEWM7oIblFkqeqmJo>
Subject: Re: [OPSEC] OpSec WGLC for draft-ietf-opsec-ns-impact
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From: Jen Linkova <furry13@gmail.com>=0A=
Sent: 28 July 2020 23:14=0A=
To: tom petch=0A=
On Wed, Jul 29, 2020 at 2:07 AM tom petch <ietfa@btconnect.com> wrote:=0A=
>> This email starts the WG Last Call for draft-ietf-opsec-ns-impact ,=0A=
>> Impact of TLS 1.3 to Operational Network Security Practices,=0A=
>> https://datatracker.ietf.org/doc/draft-ietf-opsec-ns-impact/.=0A=
=0A=
> <tp>=0A=
> OPPOSE (yes, I am shouting)=0A=
>=0A=
> This is nowhere near ready and putting it forward so soon is ... well lud=
icrous comes to mind.=0A=
>=0A=
> After WG adoption, comments were made to which there was no acknowledgeme=
nt, no response,  I was about to oppose the adoption of the other I-D from =
these authors on the grounds that until they respond to comments nothing el=
se should happen because when they do there are more comments waiting to be=
 aired.  I am still of that view.=0A=
=0A=
Sorry, it's partially my fault. I did explicitly ask the authors to=0A=
address your comments and submit a new version. I should have=0A=
double-checked that the new version incorporates the feedback.=0A=
=0A=
<tp>=0A=
Jen, it is more than that. I think that the IETF way of working is to make =
comments, get an acknowledgement and a response, from author, others, Chair=
, AD i.a., discuss the issues, accept or reject changes, new version, rinse=
 and repeat.  In this case, the next post after my comments was WGLC.  This=
 is not the process I expect. ( I thought there were other comments at adop=
tion but cannot see them now).  I did see Kathleen promising a further revi=
ew; that would be helpful.=0A=
=0A=
And as I alluded to, four weeks ago was a quiet time, a time to progress th=
is.  Now, cut-off and post cut-off, it is that time of madness in the IETF =
when everyone comes out of hibernation and posts revised I-D.  I track TEAS=
 and they have just posted 484 - yes four hundred and eighty four - pages o=
f revised I-Ds which will keep me quiet for much of August. Interesting as =
TLS is, it is behind them in the queue.=0A=
=0A=
Tom Petch =0A=
=0A=
Dear authors, would you be able to address Tom's comments ASAP so the=0A=
new revision can be reviewed during the WGLC?=0A=
=0A=
> I do see that a revised I-D has just appeared in among the thousand or so=
 I-D that appear around the time of an IETF meeting, a timing that I someti=
mes think is designed to let it slip through unnoticed.  Given all those ot=
her I-D - silly authors - it may be more than three weeks before I get my t=
houghts together.=0A=
=0A=
Just to clarify: would you prefer not to have the WGLC around IETF=0A=
weeks at all?=0A=
=0A=
--=0A=
SY, Jen Linkova aka Furry=0A=


From nobody Wed Jul 29 02:20:50 2020
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From: Jen Linkova <furry13@gmail.com>
Date: Wed, 29 Jul 2020 19:20:32 +1000
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To: tom petch <ietfa@btconnect.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/opsec/w_F5VFXWFmyW-P4IswT-hZJcTFM>
Subject: Re: [OPSEC] OpSec WGLC for draft-ietf-opsec-ns-impact
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On Wed, Jul 29, 2020 at 6:41 PM tom petch <ietfa@btconnect.com> wrote:
> Jen, it is more than that. I think that the IETF way of working is to mak=
e comments, get an acknowledgement and a response, from author, others, Cha=
ir, AD i.a., discuss the issues, accept or reject changes, new version, rin=
se and repeat.  In this case, the next post after my comments was WGLC.

Just to clarify:
- I saw your comments not being acknowledged/confirmed so we discussed
it with the authors and the proposed course of actions was: -01 is
posted to incorporate your comments and then we issue the WGLC. So
strictly speaking the next port after your comments was -01 (which was
*suppossed* to address your comments) and then WGLC.

>This is not the process I expect. ( I thought there were other comments at=
 adoption but cannot see them now).  I did see Kathleen promising a further=
 review; that would be helpful.

As I can see Kathleen confirmed that her comments had been addressed.

> And as I alluded to, four weeks ago was a quiet time, a time to progress =
this.  Now, cut-off and post cut-off, it is that time of madness in the IET=
F when everyone comes out of hibernation and posts revised I-D.  I track TE=
AS and they have just posted 484 - yes four hundred and eighty four - pages=
 of revised I-Ds which will keep me quiet for much of August. Interesting a=
s TLS is, it is behind them in the queue.

I'm sorry about adding more stuff onto your plate. Lesson learner,
we'll try to avoid issuing adoption/WGLC around IETF week.
On the other hand...I have a weird feeling that a lot of people: 1) do
not comment outside of adoption call//WGLC 2) are more active around
the IETF week.
So issuing the WGLC in the trough between IETF meetings caused an
undesirable outcome of people not paying enough attention.
But thanks for the comments, I'll take it into account - let's
consider it my learning curve..

BTW -02 has been posted so I hope your comments have been incorporated.

--=20
SY, Jen Linkova aka Furry


From nobody Wed Jul 29 04:20:23 2020
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From: "Salz, Rich" <rsalz@akamai.com>
To: Watson Ladd <watsonbladd@gmail.com>, "Eric Wang (ejwang)" <ejwang=40cisco.com@dmarc.ietf.org>
CC: "tls@ietf.org" <tls@ietf.org>, Jen Linkova <furry13@gmail.com>, "OpSec Chairs" <opsec-chairs@ietf.org>, OPSEC <opsec@ietf.org>
Thread-Topic: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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From nobody Wed Jul 29 07:42:36 2020
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Date: Wed, 29 Jul 2020 10:42:13 -0400
From: Bill Frantz <frantz@pwpconsult.com>
To: Jen Linkova <furry13@gmail.com>
cc: tom petch <ietfa@btconnect.com>, opsec WG <opsec@ietf.org>, tls@ietf.org
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Subject: Re: [OPSEC] [TLS]  OpSec WGLC for draft-ietf-opsec-ns-impact
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On 7/29/20 at 5:20 AM, furry13@gmail.com (Jen Linkova) wrote:

>So issuing the WGLC in the trough between IETF meetings caused an
>undesirable outcome of people not paying enough attention.
>But thanks for the comments, I'll take it into account - let's
>consider it my learning curve..

As a long-time lurker on the TLS list, I don't think these=20
comments apply to the TLS working group. I see the ongoing=20
business of draft, comment, new draft etc. going on=20
continuously, only to be interrupted with email about IETF=20
scheduling and agendas.

I would suggest that anything requiring input from the TLS=20
working group be presented between IETF meetings, when there are=20
many TLS experts who will take the time to review and comment.

Cheers - Bill

---------------------------------------------------------------------------
Bill Frantz        | "I wish there was a knob on the TV to turn=20
up the
408-348-7900       | intelligence.  There's a knob called=20
"brightness", but
www.pwpconsult.com | it doesn't work. -- Gallagher


From nobody Wed Jul 29 15:46:44 2020
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From: "Eric Wang (ejwang)" <ejwang@cisco.com>
To: Nick Harper <nharper=40google.com@dmarc.ietf.org>
CC: Martin Thomson <mt@lowentropy.net>, Ron Bonica <rbonica@juniper.net>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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From: "Eric Wang (ejwang)" <ejwang@cisco.com>
To: Martin Thomson <mt@lowentropy.net>
CC: Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, OPSEC <opsec@ietf.org>,  "tls@ietf.org" <tls@ietf.org>
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Date: Thu, 30 Jul 2020 00:26:47 +0100
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
To: "Eric Wang (ejwang)" <ejwang=40cisco.com@dmarc.ietf.org>,
 Nick Harper <nharper=40google.com@dmarc.ietf.org>
Cc: Ron Bonica <rbonica@juniper.net>, OPSEC <opsec@ietf.org>,
 "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Hiya,

On 29/07/2020 23:46, Eric Wang (ejwang) wrote:
> It was the motivation of this draft to help reduce/prevent
> non-compliance, as mentioned earlier.
TLS MITM products, by design, do not comply with the TLS
protocol, which is a 2 party protocol.

There is *only* non-compliance in this space.

S.

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-----END PGP PUBLIC KEY BLOCK-----

--------------6D9FB51817743AE999DF5FFC--

--rpZzDjIQiMxDRRykAbUBVOJmV6zqSzwqH--

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Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="signature.asc"

-----BEGIN PGP SIGNATURE-----

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From: Eric Rescorla <ekr@rtfm.com>
Date: Wed, 29 Jul 2020 16:56:39 -0700
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To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
Cc: "Eric Wang (ejwang)" <ejwang=40cisco.com@dmarc.ietf.org>,  Nick Harper <nharper=40google.com@dmarc.ietf.org>, Ron Bonica <rbonica@juniper.net>,  OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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On Wed, Jul 29, 2020 at 4:27 PM Stephen Farrell <stephen.farrell@cs.tcd.ie>
wrote:

>
> Hiya,
>
> On 29/07/2020 23:46, Eric Wang (ejwang) wrote:
> > It was the motivation of this draft to help reduce/prevent
> > non-compliance, as mentioned earlier.
> TLS MITM products, by design, do not comply with the TLS
> protocol, which is a 2 party protocol.
>

Without taking a position on this document, I do not believe this statement
to be correct.

1. TLS doesn't document at all how the server is validated, so from a
technical perspective a MITM proxy is simply a TLS server with a
certificate issued by a locally installed CA attached to a TLS client that
connects to the server (what is known in SIP as a B2BUA).
2. TLS 1.3 specifically documents invariants for TLS terminating
middleboxes, including MITM proxies (
https://tools.ietf.org/rfcmarkup?doc=8446#section-9.3).
3. Ignoring MITM proxies, TLS is widely deployed in operating
configurations where the client connects to a TLS reverse proxy (i.e., a
CDN) which then connects to the server; this is also not a two-party
situation.

What text in TLS do you believe terminating proxies (in either direction)
do not conform to?

-Ekr

--000000000000b3d30305ab9d50e5
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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jul 29, 2020 at 4:27 PM Steph=
en Farrell &lt;<a href=3D"mailto:stephen.farrell@cs.tcd.ie">stephen.farrell=
@cs.tcd.ie</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex"><br>
Hiya,<br>
<br>
On 29/07/2020 23:46, Eric Wang (ejwang) wrote:<br>
&gt; It was the motivation of this draft to help reduce/prevent<br>
&gt; non-compliance, as mentioned earlier.<br>
TLS MITM products, by design, do not comply with the TLS<br>
protocol, which is a 2 party protocol.<br></blockquote><div><br></div><div>=
Without taking a position on this document, I do not believe this statement=
 to be correct.</div><div><br></div><div>1. TLS doesn&#39;t document at all=
 how the server is validated, so from a technical perspective a MITM proxy =
is simply a TLS server with a certificate issued by a locally installed CA =
attached to a TLS client that connects to the server (what is known in SIP =
as a B2BUA).</div><div>2. TLS 1.3 specifically documents invariants for TLS=
 terminating middleboxes, including MITM proxies (<a href=3D"https://tools.=
ietf.org/rfcmarkup?doc=3D8446#section-9.3">https://tools.ietf.org/rfcmarkup=
?doc=3D8446#section-9.3</a>).</div><div>3. Ignoring MITM proxies, TLS is wi=
dely deployed in operating configurations where the client connects to a TL=
S reverse proxy (i.e., a CDN) which then connects to the server; this is al=
so not a two-party situation.</div><div><br></div><div>What text in TLS do =
you believe terminating proxies (in either direction) do not conform to?</d=
iv><div><br></div><div>-Ekr</div><div><br></div></div></div>

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To: Eric Rescorla <ekr@rtfm.com>
Cc: "Eric Wang (ejwang)" <ejwang=40cisco.com@dmarc.ietf.org>, Nick Harper <nharper=40google.com@dmarc.ietf.org>, Ron Bonica <rbonica@juniper.net>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
To: Eric Rescorla <ekr@rtfm.com>
Cc: "Eric Wang (ejwang)" <ejwang=40cisco.com@dmarc.ietf.org>,
 Nick Harper <nharper=40google.com@dmarc.ietf.org>,
 Ron Bonica <rbonica@juniper.net>, OPSEC <opsec@ietf.org>,
 "tls@ietf.org" <tls@ietf.org>
Message-ID: <32561228-08fc-79ea-1b2e-f5de87b9c8fe@cs.tcd.ie>
Subject: Re: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
References: <DM6PR05MB634890A51C4AF3CB1A03DA0BAE7A0@DM6PR05MB6348.namprd05.prod.outlook.com>
 <d9a9ea94-4c4a-40eb-8841-7a92fa31103e@www.fastmail.com>
 <34226646-93F3-4592-A972-A55B160D5B78@cisco.com>
 <CACdeXi+7oQgcg=-vFqxLnEFtg__6AehWXyE5ey8CBFiw9Vh8PQ@mail.gmail.com>
 <F40B9423-B0D5-4993-8A3D-D875C62951E4@cisco.com>
 <9e413fb1-da38-6a1f-8fca-a0dd5a6b6ebd@cs.tcd.ie>
 <CABcZeBNyFBaHfKf5JGXb7BBc+pcwkLoSx2wYA63AZs0O-WRtug@mail.gmail.com>
In-Reply-To: <CABcZeBNyFBaHfKf5JGXb7BBc+pcwkLoSx2wYA63AZs0O-WRtug@mail.gmail.com>

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Hiya,

On 30/07/2020 00:56, Eric Rescorla wrote:
> What text in TLS do you believe terminating proxies (in either directio=
n)
> do not conform to?

I gtend to start with the abstract: "TLS allows
client/server applications to communicate over the
Internet in a way that is designed to prevent
eavesdropping, tampering, and message forgery."

I think that text has remained through various
iterations.

More importantly, the analyses done for tls1.3
afaik do not consider such 3rd parties except as
an attacker.

I'm by no means denying the fact that MITM boxen
are deployed, but the idea that some of them are
"conformant" and some are not seems bogus.

S.

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Archived-At: <https://mailarchive.ietf.org/arch/msg/opsec/rDukat5Q0TfKymEAuVn98Jbb1is>
Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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> I gtend to start with the abstract: "TLS allows
> client/server applications to communicate over the
> Internet in a way that is designed to prevent
> eavesdropping, tampering, and message forgery."


It seems clear that TLS proxies obey the letter, if not the spirit, of =
that statement.

However, it seems to me that no further discussion in the TLSWG is =
necessary given Martin's assertion that "The TLS working group has =
decided not to undertake work in this area."



> On Jul 29, 2020, at 5:06 PM, Stephen Farrell =
<stephen.farrell@cs.tcd.ie> wrote:
>=20
>=20
> Hiya,
>=20
> On 30/07/2020 00:56, Eric Rescorla wrote:
>> What text in TLS do you believe terminating proxies (in either =
direction)
>> do not conform to?
>=20
> I gtend to start with the abstract: "TLS allows
> client/server applications to communicate over the
> Internet in a way that is designed to prevent
> eavesdropping, tampering, and message forgery."
>=20
> I think that text has remained through various
> iterations.
>=20
> More importantly, the analyses done for tls1.3
> afaik do not consider such 3rd parties except as
> an attacker.
>=20
> I'm by no means denying the fact that MITM boxen
> are deployed, but the idea that some of them are
> "conformant" and some are not seems bogus.
>=20
> S.
> =
<0x5AB2FAF17B172BEA.asc>_______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls


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From: Eric Rescorla <ekr@rtfm.com>
Date: Wed, 29 Jul 2020 17:35:16 -0700
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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On Wed, Jul 29, 2020 at 5:06 PM Stephen Farrell <stephen.farrell@cs.tcd.ie>
wrote:

>
> Hiya,
>
> On 30/07/2020 00:56, Eric Rescorla wrote:
> > What text in TLS do you believe terminating proxies (in either direction)
> > do not conform to?
>
> I gtend to start with the abstract: "TLS allows
> client/server applications to communicate over the
> Internet in a way that is designed to prevent
> eavesdropping, tampering, and message forgery."
>

> I think that text has remained through various
> iterations.
>

Yes, and in this context, the MITM proxy is a server from the client's
perspective and a client from the origin server's perspective.


More importantly, the analyses done for tls1.3
> afaik do not consider such 3rd parties except as
> an attacker.
>

I would say rather that those analyses consider them as protocol endpoints
and address the two individual connections terminated by the proxy and have
nothing to say about the composition of those two connections.


I'm by no means denying the fact that MITM boxen
> are deployed, but the idea that some of them are
> "conformant" and some are not seems bogus.
>

Well, they are either conformant with the text of 8446 S 9.3 or they are
not (and just to be clear, being conformant with 9.3 does not make them
good for the reason indicated above).

-Ekr

--000000000000d05e3f05ab9ddae2
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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jul 29, 2020 at 5:06 PM Steph=
en Farrell &lt;<a href=3D"mailto:stephen.farrell@cs.tcd.ie">stephen.farrell=
@cs.tcd.ie</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex"><br>
Hiya,<br>
<br>
On 30/07/2020 00:56, Eric Rescorla wrote:<br>
&gt; What text in TLS do you believe terminating proxies (in either directi=
on)<br>
&gt; do not conform to?<br>
<br>
I gtend to start with the abstract: &quot;TLS allows<br>
client/server applications to communicate over the<br>
Internet in a way that is designed to prevent<br>
eavesdropping, tampering, and message forgery.&quot;<br></blockquote><block=
quote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1=
px solid rgb(204,204,204);padding-left:1ex">
<br>
I think that text has remained through various<br>
iterations.<br></blockquote><div><br></div><div>Yes, and in this context, t=
he MITM proxy is a server from the client&#39;s perspective and a client fr=
om the origin server&#39;s perspective.</div><div><br></div><div><br></div>=
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
More importantly, the analyses done for tls1.3<br>
afaik do not consider such 3rd parties except as<br>
an attacker.<br></blockquote><div><br></div><div>I would say rather that th=
ose analyses consider them as protocol endpoints and address the two indivi=
dual connections terminated by the proxy and have nothing to say about the =
composition of those two connections.</div><div><br></div><div><br></div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-le=
ft:1px solid rgb(204,204,204);padding-left:1ex">
I&#39;m by no means denying the fact that MITM boxen<br>
are deployed, but the idea that some of them are<br>
&quot;conformant&quot; and some are not seems bogus.<br></blockquote><div><=
br></div><div>Well, they are either conformant with the text of 8446 S 9.3 =
or they are not (and just to be clear, being conformant with 9.3 does not m=
ake them good for the reason indicated above).<br></div><div><br></div><div=
>-Ekr</div><div><br></div><br></div></div>

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From: Rob Sayre <sayrer@gmail.com>
Date: Wed, 29 Jul 2020 17:48:06 -0700
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To: Eric Rescorla <ekr@rtfm.com>
Cc: Stephen Farrell <stephen.farrell@cs.tcd.ie>, Ron Bonica <rbonica@juniper.net>,  OPSEC <opsec@ietf.org>, Nick Harper <nharper=40google.com@dmarc.ietf.org>,  "tls@ietf.org" <tls@ietf.org>, "Eric Wang (ejwang)" <ejwang=40cisco.com@dmarc.ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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On Wed, Jul 29, 2020 at 5:36 PM Eric Rescorla <ekr@rtfm.com> wrote:

> I'm by no means denying the fact that MITM boxen
>> are deployed, but the idea that some of them are
>> "conformant" and some are not seems bogus.
>>
>
> Well, they are either conformant with the text of 8446 S 9.3 or they are
> not (and just to be clear, being conformant with 9.3 does not make them
> good for the reason indicated above).
>

This argument doesn't seem baseless, but I think these MITM documents also
presume IETF consensus on the current PKI system, and I am not sure that
has ever been tested.

thanks,
Rob

--00000000000036a58f05ab9e07f9
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<div dir=3D"ltr"><div dir=3D"ltr">On Wed, Jul 29, 2020 at 5:36 PM Eric Resc=
orla &lt;<a href=3D"mailto:ekr@rtfm.com">ekr@rtfm.com</a>&gt; wrote:<br></d=
iv><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:=
1ex"><div dir=3D"ltr"><div class=3D"gmail_quote"><blockquote class=3D"gmail=
_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204=
,204);padding-left:1ex">
I&#39;m by no means denying the fact that MITM boxen<br>
are deployed, but the idea that some of them are<br>
&quot;conformant&quot; and some are not seems bogus.<br></blockquote><div><=
br></div><div>Well, they are either conformant with the text of 8446 S 9.3 =
or they are not (and just to be clear, being conformant with 9.3 does not m=
ake them good for the reason indicated above).</div></div></div></blockquot=
e><div><br></div><div>This argument doesn&#39;t seem baseless, but I think =
these MITM documents also presume IETF consensus on the current PKI system,=
 and I am not sure that has ever been tested.</div><div><br></div><div>than=
ks,</div><div>Rob</div><div><br></div><div>=C2=A0</div></div></div>

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From: "Salz, Rich" <rsalz@akamai.com>
To: Eric Rescorla <ekr@rtfm.com>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
CC: Ron Bonica <rbonica@juniper.net>, OPSEC <opsec@ietf.org>, Nick Harper <nharper=40google.com@dmarc.ietf.org>, "tls@ietf.org" <tls@ietf.org>, "Eric Wang (ejwang)" <ejwang=40cisco.com@dmarc.ietf.org>
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From: "Eric Wang (ejwang)" <ejwang@cisco.com>
To: "Salz, Rich" <rsalz=40akamai.com@dmarc.ietf.org>
CC: Eric Rescorla <ekr@rtfm.com>, Stephen Farrell <stephen.farrell@cs.tcd.ie>,  Ron Bonica <rbonica@juniper.net>, OPSEC <opsec@ietf.org>, Nick Harper <nharper@google.com>, "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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From: Rob Sayre <sayrer@gmail.com>
Date: Wed, 29 Jul 2020 22:23:56 -0700
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To: "Eric Wang (ejwang)" <ejwang=40cisco.com@dmarc.ietf.org>
Cc: "Salz, Rich" <rsalz=40akamai.com@dmarc.ietf.org>, Ron Bonica <rbonica@juniper.net>,  OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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On Wed, Jul 29, 2020 at 9:48 PM Eric Wang (ejwang) <ejwang=3D
40cisco.com@dmarc.ietf.org> wrote:

> To echo the ickiness part=E2=80=A6   Putting on my end user hat, if I hav=
e to take
> it with an enterprise device on the enterprise network, I would rather it
> be done securely, respecting my privacy...  If I=E2=80=99m on my home net=
work, I
> want an easy way to detect and reject it, no matter it is from a vendor,
> provider or state.  At this time, there seems no easy way on either side.
>

I don't think this makes sense.

thanks,
Rob

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<div dir=3D"ltr"><div dir=3D"ltr">On Wed, Jul 29, 2020 at 9:48 PM Eric Wang=
 (ejwang) &lt;ejwang=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org" target=
=3D"_blank">40cisco.com@dmarc.ietf.org</a>&gt; wrote:<br></div><div dir=3D"=
ltr"><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"=
margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-lef=
t:1ex">



<div>
To echo the ickiness part=E2=80=A6 =C2=A0 Putting on my end user hat, if I =
have to take it with an enterprise device on the enterprise network, I woul=
d rather it be done securely, respecting my privacy...=C2=A0 If I=E2=80=99m=
 on my home network, I want an easy way to detect and reject
 it, no matter it is from a vendor, provider or state.=C2=A0 At this time, =
there seems no easy way on either side.</div></blockquote><div><br></div><d=
iv>I don&#39;t think this makes sense.</div><div><br></div><div>thanks,</di=
v><div>Rob</div><div>=C2=A0</div></div></div>
</div>

--000000000000cbc1e405aba1e175--


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From: Paul Brears <paulbrears@hotmail.com>
To: Arnaud.Taddei.IETF <Arnaud.Taddei.IETF@protonmail.com>, Jen Linkova <furry13@gmail.com>
CC: OPSEC <opsec@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>, "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Archived-At: <https://mailarchive.ietf.org/arch/msg/opsec/Ie45L4KoI7s7MHtfcmt4DdS5Va0>
Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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I support this draft and agree with the points made below.

Paul

From: Arnaud.Taddei.IETF<mailto:Arnaud.Taddei.IETF=3D40protonmail.com@dmarc=
.ietf.org>
Sent: 28 July 2020 09:36
To: Jen Linkova<mailto:furry13@gmail.com>
Cc: OPSEC<mailto:opsec@ietf.org>; OpSec Chairs<mailto:opsec-chairs@ietf.org=
>; tls@ietf.org<mailto:tls@ietf.org>
Subject: Re: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp

I strongly support this work as it represents capabilities that are being d=
eveloped, deployed and used in practice. It has good intentions and provide=
s a good approach in the context of defense in depth approaches. No securit=
y cannot be just on both ends of the communication. One can dream about it =
but that is not how reality is. Removing this possibility is a limit to the=
 overall defense.

I do not understand the reasons behind ignoring reality and the IETF would =
have, in my naive mind, a strong interest in getting this work under good c=
ommunity adoption so that it is kept in good control with validated best pr=
actices. Everyone would win.

I support this draft


Sent with ProtonMail Secure Email.

=1B$B!>!>!>!>!>!>!>=1B(B Original Message =1B$B!>!>!>!>!>!>!>=1B(B
On Thursday 23 July 2020 03:30, Jen Linkova <furry13@gmail.com> wrote:

> One thing to add here: the chairs would like to hear active and
> explicit support of the adoption. So please speak up if you believe
> the draft is useful and the WG shall work on getting it published.
>
> On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica
> rbonica=3D40juniper.net@dmarc.ietf.org wrote:
>
> > Folks,
> > This email begins a Call For Adoption on draft-wang-opsec-tls-proxy-bp.
> > Please send comments to opsec@ietf.org by August 3, 2020.
> >
> >                                                                 Ron
> >
> >
> > Juniper Business Use Only
> >
> > OPSEC mailing list
> > OPSEC@ietf.org
> > https://www.ietf.org/mailman/listinfo/opsec
>
> --
>
> SY, Jen Linkova aka Furry
>
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls


_______________________________________________
TLS mailing list
TLS@ietf.org
https://www.ietf.org/mailman/listinfo/tls


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<div class=3D"WordSection1">
<p class=3D"MsoNormal">I support this draft and agree with the points made =
below.</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Paul</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"mso-element:para-border-div;border:none;border-top:solid #E1E=
1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class=3D"MsoNormal" style=3D"border:none;padding:0cm"><b>From: </b><a hr=
ef=3D"mailto:Arnaud.Taddei.IETF=3D40protonmail.com@dmarc.ietf.org">Arnaud.T=
addei.IETF</a><br>
<b>Sent: </b>28 July 2020 09:36<br>
<b>To: </b><a href=3D"mailto:furry13@gmail.com">Jen Linkova</a><br>
<b>Cc: </b><a href=3D"mailto:opsec@ietf.org">OPSEC</a>; <a href=3D"mailto:o=
psec-chairs@ietf.org">
OpSec Chairs</a>; <a href=3D"mailto:tls@ietf.org">tls@ietf.org</a><br>
<b>Subject: </b>Re: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-p=
roxy-bp</p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I strongly support this work as it represents capabi=
lities that are being developed, deployed and used in practice. It has good=
 intentions and provides a good approach in the context of defense in depth=
 approaches. No security cannot be
 just on both ends of the communication. One can dream about it but that is=
 not how reality is. Removing this possibility is a limit to the overall de=
fense.<br>
<br>
I do not understand the reasons behind ignoring reality and the IETF would =
have, in my naive mind, a strong interest in getting this work under good c=
ommunity adoption so that it is kept in good control with validated best pr=
actices. Everyone would win.<br>
<br>
I support this draft<br>
<br>
<br>
Sent with ProtonMail Secure Email.<br>
<br>
=1B$B!>!>!>!>!>!>!>=1B(B Original Message =1B$B!>!>!>!>!>!>!>=1B(B<br>
On Thursday 23 July 2020 03:30, Jen Linkova &lt;furry13@gmail.com&gt; wrote=
:<br>
<br>
&gt; One thing to add here: the chairs would like to hear active and<br>
&gt; explicit support of the adoption. So please speak up if you believe<br=
>
&gt; the draft is useful and the WG shall work on getting it published.<br>
&gt;<br>
&gt; On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica<br>
&gt; rbonica=3D40juniper.net@dmarc.ietf.org wrote:<br>
&gt;<br>
&gt; &gt; Folks,<br>
&gt; &gt; This email begins a Call For Adoption on draft-wang-opsec-tls-pro=
xy-bp.<br>
&gt; &gt; Please send comments to opsec@ietf.org by August 3, 2020.<br>
&gt; &gt;<br>
&gt; &gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; Ron<br>
&gt; &gt;<br>
&gt; &gt;<br>
&gt; &gt; Juniper Business Use Only<br>
&gt; &gt;<br>
&gt; &gt; OPSEC mailing list<br>
&gt; &gt; OPSEC@ietf.org<br>
&gt; &gt; <a href=3D"https://www.ietf.org/mailman/listinfo/opsec">https://w=
ww.ietf.org/mailman/listinfo/opsec</a><br>
&gt;<br>
&gt; --<br>
&gt;<br>
&gt; SY, Jen Linkova aka Furry<br>
&gt;<br>
&gt; TLS mailing list<br>
&gt; TLS@ietf.org<br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/tls">https://www.ietf=
.org/mailman/listinfo/tls</a><br>
<br>
<br>
_______________________________________________<br>
TLS mailing list<br>
TLS@ietf.org<br>
<a href=3D"https://www.ietf.org/mailman/listinfo/tls">https://www.ietf.org/=
mailman/listinfo/tls</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

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From: =?UTF-8?Q?T=C3=B6ma_Gavrichenkov?= <ximaera@gmail.com>
Date: Thu, 30 Jul 2020 15:03:40 +0300
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To: "Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu>
Cc: "Nancy Cam-Winget (ncamwing)" <ncamwing@cisco.com>, Stephen Farrell <stephen.farrell@cs.tcd.ie>,  Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/opsec/6GBoGIA2_EiaD18YVI2F6pRKKu0>
Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Peace,

On Mon, Jul 27, 2020, 4:18 PM Blumenthal, Uri - 0553 - MITLL <uri@ll.mit.ed=
u>
wrote:

> in this particular case, instead of "if you want to do this, then do it
> that way, and I'll help you inter-operate" I prefer "if you want to do th=
is
> - you're on your own, don't seek a blessing or advice from me".
>

I don't think this is how it works.

I would personally prefer an explicit "this is not recommended or in any
way endorsed".

I've already heard that "IETF considers this a grey area to be defined in
future, and some interoperability is outlined in 8446" in middlebox sales
pitches.

>
--
T=C3=B6ma

>

--000000000000540d3905aba777bc
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<div dir=3D"auto"><div>Peace,<br><br><div class=3D"gmail_quote"><div dir=3D=
"ltr" class=3D"gmail_attr">On Mon, Jul 27, 2020, 4:18 PM Blumenthal, Uri - =
0553 - MITLL &lt;<a href=3D"mailto:uri@ll.mit.edu" target=3D"_blank" rel=3D=
"noreferrer">uri@ll.mit.edu</a>&gt; wrote:</div><blockquote class=3D"gmail_=
quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1=
ex">in this particular case, instead of &quot;if you want to do this, then =
do it that way, and I&#39;ll help you inter-operate&quot; I prefer &quot;if=
 you want to do this - you&#39;re on your own, don&#39;t seek a blessing or=
 advice from me&quot;.<br></blockquote></div></div><div dir=3D"auto"><br></=
div><div dir=3D"auto">I don&#39;t think this is how it works.</div><div dir=
=3D"auto"><br></div><div dir=3D"auto">I would personally prefer an explicit=
 &quot;this is not recommended or in any way endorsed&quot;.</div><div dir=
=3D"auto"><br></div><div dir=3D"auto">I&#39;ve already heard that &quot;IET=
F considers this a grey area to be defined in future, and some interoperabi=
lity is outlined in 8446&quot; in middlebox sales pitches.</div><div dir=3D=
"auto"><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"></blockq=
uote></div></div><div dir=3D"auto"><br></div><div dir=3D"auto">--</div><div=
 dir=3D"auto">T=C3=B6ma</div><div dir=3D"auto"><div class=3D"gmail_quote"><=
blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px=
 #ccc solid;padding-left:1ex">
</blockquote></div></div></div>

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From: =?UTF-8?Q?T=C3=B6ma_Gavrichenkov?= <ximaera@gmail.com>
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To: "Salz, Rich" <rsalz=40akamai.com@dmarc.ietf.org>
Cc: Watson Ladd <watsonbladd@gmail.com>,  "Eric Wang (ejwang)" <ejwang=40cisco.com@dmarc.ietf.org>, Jen Linkova <furry13@gmail.com>,  OPSEC <opsec@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>, "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Peace,

On Wed, Jul 29, 2020, 2:20 PM Salz, Rich <rsalz=3D40akamai.com@dmarc.ietf.o=
rg>
wrote:

> Also, a CDN is not a proxy.  It **IS** an entity that the origin has
> contracted with to perform certain functions.
>

It is (in all but a couple of implementations I think) a *proxy* that the
origin has contracted with.  Could you please elaborate on your point?

--
T=C3=B6ma

>

--00000000000079a80705aba79293
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<div dir=3D"auto">Peace,<br><br><div class=3D"gmail_quote" dir=3D"auto"><di=
v dir=3D"ltr" class=3D"gmail_attr">On Wed, Jul 29, 2020, 2:20 PM Salz, Rich=
 &lt;rsalz=3D<a href=3D"mailto:40akamai.com@dmarc.ietf.org">40akamai.com@dm=
arc.ietf.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-9104934100007510557WordSection1">
<p class=3D"MsoNormal">Also, a CDN is not a proxy.=C2=A0 It *<b>IS</b>* an =
entity that the origin has contracted with to perform certain functions.</p=
></div></div></blockquote></div><div dir=3D"auto"><br></div><div dir=3D"aut=
o">It is (in all but a couple of implementations I think) a *proxy* that th=
e origin has contracted with.=C2=A0 Could you please elaborate on your poin=
t?</div><div dir=3D"auto"><br></div><div dir=3D"auto">--</div><div dir=3D"a=
uto">T=C3=B6ma</div><div class=3D"gmail_quote" dir=3D"auto"><blockquote cla=
ss=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pa=
dding-left:1ex">
</blockquote></div></div>

--00000000000079a80705aba79293--


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From: "Salz, Rich" <rsalz@akamai.com>
To: =?utf-8?B?VMO2bWEgR2F2cmljaGVua292?= <ximaera@gmail.com>
CC: Watson Ladd <watsonbladd@gmail.com>, "Eric Wang (ejwang)" <ejwang@cisco.com>, Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>, "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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From: =?UTF-8?Q?T=C3=B6ma_Gavrichenkov?= <ximaera@gmail.com>
Date: Thu, 30 Jul 2020 16:13:09 +0300
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To: "Salz, Rich" <rsalz@akamai.com>
Cc: Watson Ladd <watsonbladd@gmail.com>, "Eric Wang (ejwang)" <ejwang@cisco.com>,  Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>, "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Peace,

On Thu, Jul 30, 2020 at 3:33 PM Salz, Rich <rsalz@akamai.com> wrote:
>> It is (in all but a couple of implementations I think)
> a *proxy* that the origin has contracted with.  Could
> you please elaborate on your point?
>
> It has a TLS cert that identifies itself as the origin.

It depends!

In the majority of cases (i.e. delivering preseeded static content),
no. It identifies as some-1337-garbage.static.example.com, which it
basically *is*.
The manner in which the content (hopefully uploaded by the origin via
an end-to-end encrypted connection) propagates to edge nodes is then
up to the implementation, and it is contained within the area of
responsibility of the CDN operator.

However, there's a minority of cases where a CDN is also used to
deliver *dynamically generated* content which could not be cached,
e.g. because it is only available to authenticated users.  In this
case, the CDN in fact impersonates the origin, processes all the
authentication data, and the only way to implement that is proxying
across different areas of responsibility.  How's that different from
what middleboxes are doing is not clear to me.

Proxy is a proxy.  There are various kind of proxies probably also
doing something which is deemed useful to their owners and users,
which doesn't relax the statement that such proxying is not endorsed
by the IETF.  The intent and purpose behind proxying are IMO in scope
of model-t and are, accordingly, out of scope here.

> How is it different from an origin that uses load-balancing to send you s=
omewhere?  Is www.facebook.com a CDN or intermediary, or is it the origin?

Is www.facebook.com a Facebook-owned middlebox, or is it the endpoint
server?  (And this is *one* of the reasons I won't trust Facebook for
anything sensitive!)

Again, I think this is more of a topic for model-t.

The main difference though is that the data crosses the boundary
between the areas of responsibility in a way which is not transparent
to me.  It is a common approach to allow insecure connections over the
Internet from the edge nodes to the origin, and I have no way of
knowing if this is the case for the resource I'm currently using.
There are also more subtle differences but I think I've long crossed
the boundary of the off-topic area here myself!

--
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From: "Salz, Rich" <rsalz@akamai.com>
To: =?utf-8?B?VMO2bWEgR2F2cmljaGVua292?= <ximaera@gmail.com>
CC: Watson Ladd <watsonbladd@gmail.com>, "Eric Wang (ejwang)" <ejwang@cisco.com>, Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>, "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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From: =?UTF-8?Q?T=C3=B6ma_Gavrichenkov?= <ximaera@gmail.com>
Date: Thu, 30 Jul 2020 17:56:44 +0300
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To: "Salz, Rich" <rsalz@akamai.com>
Cc: Watson Ladd <watsonbladd@gmail.com>, "Eric Wang (ejwang)" <ejwang@cisco.com>,  Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>, "tls@ietf.org" <tls@ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Peace,

On Thu, Jul 30, 2020, 4:39 PM Salz, Rich <rsalz@akamai.com> wrote:

> We have a product, site shield, that customers can use to limit the IP
> addresses of who can reach their origin server.  Everyone else is blocked=
.
> Some use that to make sure that *only* Akamai servers will talk to them,
> and that everything else goes through us.  Is that a proxy? How is it
> different from terminating TLS in the DMZ and sending it inside? How does
> the client know?
>

I don't know, and this *is* the problem.

I may be connecting to the service from a network I don't trust with my
information, and I have (almost) no tool to tell me whether it is served
from a different network via a secure connection *or* it is served from an
edge node deployed *in the same network I don't trust*, that node being
connected to the service through an unauthenticated channel.

Like in [1], where this unauthenticated channel is being marketed as
"end-to-end encryption".  This approach basically defies all the end-to-end
encryption efforts.

When it comes to static content, with all the JS security implemented, this
is mostly fine.  Dynamic content is a very different story.

[1]
https://support.cloudflare.com/hc/en-us/articles/200170416-End-to-end-HTTPS=
-with-Cloudflare-Part-3-SSL-options

--
T=C3=B6ma

>

--0000000000003b466405aba9e2cc
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto"><div>Peace,<br><br><div class=3D"gmail_quote"><div dir=3D=
"ltr" class=3D"gmail_attr">On Thu, Jul 30, 2020, 4:39 PM Salz, Rich &lt;<a =
href=3D"mailto:rsalz@akamai.com">rsalz@akamai.com</a>&gt; wrote:</div><bloc=
kquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #cc=
c solid;padding-left:1ex">We have a product, site shield, that customers ca=
n use to limit the IP addresses of who can reach their origin server.=C2=A0=
 Everyone else is blocked. Some use that to make sure that *only* Akamai se=
rvers will talk to them, and that everything else goes through us.=C2=A0 Is=
 that a proxy? How is it different from terminating TLS in the DMZ and send=
ing it inside? How does the client know?<br></blockquote></div></div><div d=
ir=3D"auto"><br></div><div dir=3D"auto">I don&#39;t know, and this *is* the=
 problem.</div><div dir=3D"auto"><br></div><div dir=3D"auto">I may be conne=
cting to the service from a network I don&#39;t trust with my information, =
and I have (almost) no tool to tell me whether it is served from a differen=
t network via a secure connection *or* it is served from an edge node deplo=
yed *in the same network I don&#39;t trust*, that node being connected to t=
he service through an unauthenticated channel.</div><div dir=3D"auto"><br><=
/div><div dir=3D"auto">Like in [1], where this unauthenticated channel is b=
eing marketed as &quot;end-to-end encryption&quot;.=C2=A0 This approach bas=
ically defies all the end-to-end encryption efforts.</div><div dir=3D"auto"=
><br></div><div dir=3D"auto">When it comes to static content, with all the =
JS security implemented, this is mostly fine.=C2=A0 Dynamic content is a ve=
ry different story.</div><div dir=3D"auto"><br></div><div dir=3D"auto">[1]=
=C2=A0<a href=3D"https://support.cloudflare.com/hc/en-us/articles/200170416=
-End-to-end-HTTPS-with-Cloudflare-Part-3-SSL-options">https://support.cloud=
flare.com/hc/en-us/articles/200170416-End-to-end-HTTPS-with-Cloudflare-Part=
-3-SSL-options</a></div><div dir=3D"auto"><br></div><div dir=3D"auto">--</d=
iv><div dir=3D"auto">T=C3=B6ma</div><div dir=3D"auto"><div class=3D"gmail_q=
uote"><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-l=
eft:1px #ccc solid;padding-left:1ex">
</blockquote></div></div></div>

--0000000000003b466405aba9e2cc--


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From: Nick Harper <nharper@google.com>
Date: Thu, 30 Jul 2020 08:18:01 -0700
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To: =?UTF-8?Q?T=C3=B6ma_Gavrichenkov?= <ximaera@gmail.com>
Cc: "Salz, Rich" <rsalz@akamai.com>, Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>,  "tls@ietf.org" <tls@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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On Thu, Jul 30, 2020 at 7:58 AM T=C3=B6ma Gavrichenkov <ximaera@gmail.com> =
wrote:

> Peace,
>
> On Thu, Jul 30, 2020, 4:39 PM Salz, Rich <rsalz@akamai.com> wrote:
>
>> We have a product, site shield, that customers can use to limit the IP
>> addresses of who can reach their origin server.  Everyone else is blocke=
d.
>> Some use that to make sure that *only* Akamai servers will talk to them,
>> and that everything else goes through us.  Is that a proxy? How is it
>> different from terminating TLS in the DMZ and sending it inside? How doe=
s
>> the client know?
>>
>
> I don't know, and this *is* the problem.
>

The point is, whatever server/device has a publicly trusted certificate for
a domain name is authoritative for that domain. That server can get the
content it serves (whether dynamic or static) from any source. TLS only
provides guarantees about the connection between the client and server. It
says nothing about whether the content served was obtained or generated in
some secure manner. That content could be sourced locally, it could be
aggregated or generated from other servers via connections over other
secure protocols that aren't TLS, it could even come from some insecure
source like transmitting an audio stream collected from an antenna
connected to the server.

I may be connecting to the service from a network I don't trust with my
> information, and I have (almost) no tool to tell me whether it is served
> from a different network via a secure connection *or* it is served from a=
n
> edge node deployed *in the same network I don't trust*, that node being
> connected to the service through an unauthenticated channel.
>

If you're connecting to a service, at some point you have to trust that the
service operator is running it in a reasonable way. TLS only tells you that
your connection to the server is secure - it tells you nothing about the
provenance of the content served, and even if such a mechanism exists (I am
not advocating that such a thing should exist), the server can always claim
that it generated it instead of that it got it from somewhere else.

>
> Like in [1], where this unauthenticated channel is being marketed as
> "end-to-end encryption".  This approach basically defies all the end-to-e=
nd
> encryption efforts.
>
> When it comes to static content, with all the JS security implemented,
> this is mostly fine.  Dynamic content is a very different story.
>
> [1]
> https://support.cloudflare.com/hc/en-us/articles/200170416-End-to-end-HTT=
PS-with-Cloudflare-Part-3-SSL-options
>
> --
> T=C3=B6ma
>
>> _______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls
>

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Thu, Jul 30, 2020 at 7:58 AM T=C3=
=B6ma Gavrichenkov &lt;<a href=3D"mailto:ximaera@gmail.com">ximaera@gmail.c=
om</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex=
"><div dir=3D"auto"><div>Peace,<br><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Thu, Jul 30, 2020, 4:39 PM Salz, Rich &lt;=
<a href=3D"mailto:rsalz@akamai.com" target=3D"_blank">rsalz@akamai.com</a>&=
gt; wrote:</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0=
px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">We have a=
 product, site shield, that customers can use to limit the IP addresses of =
who can reach their origin server.=C2=A0 Everyone else is blocked. Some use=
 that to make sure that *only* Akamai servers will talk to them, and that e=
verything else goes through us.=C2=A0 Is that a proxy? How is it different =
from terminating TLS in the DMZ and sending it inside? How does the client =
know?<br></blockquote></div></div><div dir=3D"auto"><br></div><div dir=3D"a=
uto">I don&#39;t know, and this *is* the problem.</div></div></blockquote><=
div><br></div><div>The point is, whatever server/device has a publicly trus=
ted certificate for a domain name is authoritative for that domain. That se=
rver can get the content it serves (whether dynamic or static) from any sou=
rce. TLS only provides guarantees about the connection between the client a=
nd server. It says nothing about whether the content served was obtained or=
 generated in some secure manner. That content could be sourced locally, it=
 could be aggregated or generated from other servers via connections over o=
ther secure protocols that aren&#39;t TLS, it could even come from some ins=
ecure source like transmitting an audio stream collected from an antenna co=
nnected to the server.</div><div><br></div><blockquote class=3D"gmail_quote=
" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);=
padding-left:1ex"><div dir=3D"auto"><div dir=3D"auto"></div><div dir=3D"aut=
o">I may be connecting to the service from a network I don&#39;t trust with=
 my information, and I have (almost) no tool to tell me whether it is serve=
d from a different network via a secure connection *or* it is served from a=
n edge node deployed *in the same network I don&#39;t trust*, that node bei=
ng connected to the service through an unauthenticated channel.</div></div>=
</blockquote><div><br></div><div>If you&#39;re connecting to a service, at =
some point you have to trust that the service operator is running it in a r=
easonable way. TLS only tells you that your connection to the server is sec=
ure - it tells you nothing about the provenance of the content served, and =
even if such a mechanism exists (I am not advocating that such a thing shou=
ld exist), the server can always claim that it generated it instead of that=
 it got it from somewhere else.</div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex"><div dir=3D"auto"><div dir=3D"auto"><br></div><div dir=3D"auto"=
>Like in [1], where this unauthenticated channel is being marketed as &quot=
;end-to-end encryption&quot;.=C2=A0 This approach basically defies all the =
end-to-end encryption efforts.</div><div dir=3D"auto"><br></div><div dir=3D=
"auto">When it comes to static content, with all the JS security implemente=
d, this is mostly fine.=C2=A0 Dynamic content is a very different story.</d=
iv><div dir=3D"auto"><br></div><div dir=3D"auto">[1]=C2=A0<a href=3D"https:=
//support.cloudflare.com/hc/en-us/articles/200170416-End-to-end-HTTPS-with-=
Cloudflare-Part-3-SSL-options" target=3D"_blank">https://support.cloudflare=
.com/hc/en-us/articles/200170416-End-to-end-HTTPS-with-Cloudflare-Part-3-SS=
L-options</a></div><div dir=3D"auto"><br></div><div dir=3D"auto">--</div><d=
iv dir=3D"auto">T=C3=B6ma</div><div dir=3D"auto"><div class=3D"gmail_quote"=
><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border=
-left:1px solid rgb(204,204,204);padding-left:1ex">
</blockquote></div></div></div>
_______________________________________________<br>
TLS mailing list<br>
<a href=3D"mailto:TLS@ietf.org" target=3D"_blank">TLS@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/tls" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/tls</a><br>
</blockquote></div></div>

--00000000000049530f05abaa2e19--


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From: "Eric Wang (ejwang)" <ejwang@cisco.com>
To: Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>
CC: OpSec Chairs <opsec-chairs@ietf.org>
Thread-Topic: [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Subject: Re: [OPSEC] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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From: Rob Sayre <sayrer@gmail.com>
Date: Fri, 31 Jul 2020 15:33:23 -0700
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To: "Eric Wang (ejwang)" <ejwang=40cisco.com@dmarc.ietf.org>
Cc: Jen Linkova <furry13@gmail.com>, OPSEC <opsec@ietf.org>, "tls@ietf.org" <tls@ietf.org>, OpSec Chairs <opsec-chairs@ietf.org>
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Subject: Re: [OPSEC] [TLS] Call For Adoption: draft-wang-opsec-tls-proxy-bp
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Hi,

I think this WG is a bit zombie-like. Its most recent milestones are from
2013 [1].

I favor rejecting all active drafts (although I can see value in publishing
them via the ISE), and closing this WG.

thanks,
Rob

[1] https://datatracker.ietf.org/wg/opsec/about/

On Fri, Jul 31, 2020 at 11:41 AM Eric Wang (ejwang) <ejwang=3D
40cisco.com@dmarc.ietf.org> wrote:

> As authors we appreciate all the constructive comments on the draft.
> Based on the feedback, we will revise the scope of the document to cover
> =E2=80=9Cplain=E2=80=9D TLS proxy only (removing =E2=80=9Cselective proxy=
ing=E2=80=9D).  We will circulate
> a new revision when it is ready.
>
> Best,
> -Eric (on behalf of the authors)
>
>
> On Jul 22, 2020, at 6:30 PM, Jen Linkova <furry13@gmail.com> wrote:
>
> One thing to add here: the chairs would like to hear active and
> explicit support of the adoption. So please speak up if you believe
> the draft is useful and the WG shall work on getting it published.
>
> On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica
> <rbonica=3D40juniper.net@dmarc.ietf.org> wrote:
>
>
> Folks,
>
>
>
> This email begins a Call For Adoption on draft-wang-opsec-tls-proxy-bp.
>
>
>
> Please send comments to opsec@ietf.org by August 3, 2020.
>
>
>
>                                                                Ron
>
>
>
>
> Juniper Business Use Only
>
> _______________________________________________
> OPSEC mailing list
> OPSEC@ietf.org
> https://www.ietf.org/mailman/listinfo/opsec
>
>
>
>
> --
> SY, Jen Linkova aka Furry
>
> _______________________________________________
> OPSEC mailing list
> OPSEC@ietf.org
> https://www.ietf.org/mailman/listinfo/opsec
>
>
> _______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls
>

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<div dir=3D"ltr">Hi,<div><br></div><div>I think this WG is a bit zombie-lik=
e. Its most recent milestones are from 2013 [1].</div><div><br></div><div>I=
 favor rejecting all active drafts (although I can see value in publishing =
them via the ISE), and closing this WG.</div><div><br></div><div>thanks,</d=
iv><div>Rob</div><div><br></div><div>[1]=C2=A0<a href=3D"https://datatracke=
r.ietf.org/wg/opsec/about/">https://datatracker.ietf.org/wg/opsec/about/</a=
></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail=
_attr">On Fri, Jul 31, 2020 at 11:41 AM Eric Wang (ejwang) &lt;ejwang=3D<a =
href=3D"mailto:40cisco.com@dmarc.ietf.org">40cisco.com@dmarc.ietf.org</a>&g=
t; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">



<div style=3D"overflow-wrap: break-word;">
As authors we appreciate all the constructive comments on the draft.=C2=A0 =
Based on the feedback, we will revise the scope of the document to cover =
=E2=80=9Cplain=E2=80=9D TLS proxy only (removing =E2=80=9Cselective proxyin=
g=E2=80=9D).=C2=A0 We will circulate a new revision when it is ready.
<div><br>
</div>
<div>Best,</div>
<div>-Eric (on behalf of the authors)</div>
<div><br>
<div><br>
<blockquote type=3D"cite">
<div>On Jul 22, 2020, at 6:30 PM, Jen Linkova &lt;<a href=3D"mailto:furry13=
@gmail.com" target=3D"_blank">furry13@gmail.com</a>&gt; wrote:</div>
<br>
<div>
<div>One thing to add here: the chairs would like to hear active and<br>
explicit support of the adoption. So please speak up if you believe<br>
the draft is useful and the WG shall work on getting it published.<br>
<br>
On Mon, Jul 20, 2020 at 3:35 AM Ron Bonica<br>
&lt;<a href=3D"mailto:rbonica=3D40juniper.net@dmarc.ietf.org" target=3D"_bl=
ank">rbonica=3D40juniper.net@dmarc.ietf.org</a>&gt; wrote:<br>
<blockquote type=3D"cite"><br>
Folks,<br>
<br>
<br>
<br>
This email begins a Call For Adoption on draft-wang-opsec-tls-proxy-bp.<br>
<br>
<br>
<br>
Please send comments to <a href=3D"mailto:opsec@ietf.org" target=3D"_blank"=
>opsec@ietf.org</a> by August 3, 2020.<br>
<br>
<br>
<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0Ron<br>
<br>
<br>
<br>
<br>
Juniper Business Use Only<br>
<br>
_______________________________________________<br>
OPSEC mailing list<br>
<a href=3D"mailto:OPSEC@ietf.org" target=3D"_blank">OPSEC@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/opsec" target=3D"_blank">h=
ttps://www.ietf.org/mailman/listinfo/opsec</a><br>
</blockquote>
<br>
<br>
<br>
--<br>
SY, Jen Linkova aka Furry<br>
<br>
_______________________________________________<br>
OPSEC mailing list<br>
<a href=3D"mailto:OPSEC@ietf.org" target=3D"_blank">OPSEC@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/opsec" target=3D"_blank">h=
ttps://www.ietf.org/mailman/listinfo/opsec</a><br>
</div>
</div>
</blockquote>
</div>
<br>
</div>
</div>

_______________________________________________<br>
TLS mailing list<br>
<a href=3D"mailto:TLS@ietf.org" target=3D"_blank">TLS@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/tls" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/tls</a><br>
</blockquote></div>

--0000000000003080ef05abc46130--

