
From nobody Thu Apr  1 06:45:08 2021
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Date: Thu, 1 Apr 2021 09:45:00 -0400
From: Viktor Dukhovni <ietf-dane@dukhovni.org>
To: dane@ietf.org
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Subject: [dane] IMPORTANT: Please ensure your NSEC3 iteration count is sufficiently low
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RFC 5155 defined NSEC3 iterations to scale up with the RSA/DSA key size
up to perhaps as high as 2500 iterations for 4096-bit keys.  In
retrospect such a generous iteration cap is counter-productive.  It is
neither particularly effective at keeping your zone content "secret",
nor sufficiently cheap to avoid negative impact on authoritative and
iterative resolver performance.

In that light, Wes Hardaker and I have authored an Internet-Draft that
strongly recommends setting the NSEC3 additional iteration count to 0
(at least one initial SHA1 hash is always performed).

    https://tools.ietf.org/html/draft-hardaker-dnsop-nsec3-guidance-02

Today, the Knot resolver became the first one to cap NSEC3 iterations
for now at 150, but this will likely be reduced further (perhaps
ultimately as low as ~25):

	https://gitlab.nic.cz/knot/knot-resolver/-/tags/v5.3.1

and is expected to be done by more resolvers.

Since iteration counts above the resolver cap make denial-of-existence
for the entire zone insecure, it is important that all domains with a
high NSEC3 iteration count proactively lower it ideally to 0, but
otherwise ~10 or less.

While DNSSEC still precludes forged positive answers, any signed
NXDomain or NODATA NSEC3 response can be replayed for any query,
regardless of the qname.

This impacts any protocol in which negative responses have security
consequences.  Potential exposures include:

    - Forged absence of RFC7672 DANE SMTP TLSA records
    - Forged absence of CAA records
    - Forged absence of HTTPS records enabling various downgrades
    - ...

A number of TLDs have already lowred their iteration counts, and it is
expected that most of the rest will follow soon.

    TLD                 before  after
    ---                 ------  -----
    la          	   150      1
    xn--q7ce6a  	   150      1
    blue        	   100     10
    green       	   100     10
    lat         	   100     10
    mx          	   100     10
    pink        	   100     10
    red         	   100     10
    schaeffler  	   100     10
    by          	   100      3
    creditunion 	   100      3
    ally        	   100      1
    autos       	   100      1
    boats       	   100      1
    homes       	   100      1
    motorcycles 	   100      1
    yachts      	   100      1

If your DNS zone is configured to use NSEC3, please:

    - Reduce the iteration count to 10 or less.

    - Disable opt-out, you're very unlikely to need it.

    - Either rotate the salt each time you sign, or skip
      it entirely.  But a short fixed salt is harmless if
      leaving it alone easier than changing it.

Of course, if your zone is small enough (just the zone apex and a
handful of already public or easy to guess names) or in any case has
nothing to hide, even better is to use just plain NSEC.  You get smaller
negative replies (less exposure to DoS) and more effective negative
caching at resolvers.  So in many cases, it is even simpler to abandon
NSEC3 entirely.  Please also consider the pros/cons of that option.

-- 
	Viktor.


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Subject: [dane] [Editorial Errata Reported] RFC8162 (6544)
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The following errata report has been submitted for RFC8162,
"Using Secure DNS to Associate Certificates with Domain Names for S/MIME".

--------------------------------------
You may review the report below and at:
https://www.rfc-editor.org/errata/eid6544

--------------------------------------
Type: Editorial
Reported by: Kaspar Etter <me@kasparetter.com>

Section: 1

Original Text
-------------
Others to want mitigate the difficulty of finding certificates from outside the enterprise.

Corrected Text
--------------
Others want to mitigate the difficulty of finding certificates from outside the enterprise.

Notes
-----
Wrong order of words.

Instructions:
-------------
This erratum is currently posted as "Reported". If necessary, please
use "Reply All" to discuss whether it should be verified or
rejected. When a decision is reached, the verifying party  
can log in to change the status and edit the report, if necessary. 

--------------------------------------
RFC8162 (draft-ietf-dane-smime-16)
--------------------------------------
Title               : Using Secure DNS to Associate Certificates with Domain Names for S/MIME
Publication Date    : May 2017
Author(s)           : P. Hoffman, J. Schlyter
Category            : EXPERIMENTAL
Source              : DNS-based Authentication of Named Entities
Area                : Security
Stream              : IETF
Verifying Party     : IESG


From nobody Wed Apr 14 11:25:01 2021
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From: Paul Hoffman <paul.hoffman@icann.org>
To: RFC Editor <rfc-editor@rfc-editor.org>
CC: Jakob Schlyter <jakob@kirei.se>, Roman Danyliw <rdd@cert.org>, "Benjamin Kaduk" <kaduk@mit.edu>, Olafur Gudmundsson <ogud@ogud.com>, Warren Kumari <warren@kumari.net>, "me@kasparetter.com" <me@kasparetter.com>, "dane@ietf.org" <dane@ietf.org>
Thread-Topic: [Ext] [Editorial Errata Reported] RFC8162 (6544)
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Subject: Re: [dane] [Ext] [Editorial Errata Reported] RFC8162 (6544)
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This is correct, and can be marked as simply editorial.

--Paul Hoffman

> On Apr 14, 2021, at 5:17 AM, RFC Errata System =
<rfc-editor@rfc-editor.org> wrote:
>=20
> The following errata report has been submitted for RFC8162,
> "Using Secure DNS to Associate Certificates with Domain Names for =
S/MIME".
>=20
> --------------------------------------
> You may review the report below and at:
> =
https://urldefense.com/v3/__https://www.rfc-editor.org/errata/eid6544__;!!=
PtGJab4!r1otOc1PXUoFRkWg2JBSnI8i4wWCmIFklD9io6yBqfYaC5fYw-e71lLmM7rPbeoj0-=
6JJMHj4g$=20
>=20
> --------------------------------------
> Type: Editorial
> Reported by: Kaspar Etter <me@kasparetter.com>
>=20
> Section: 1
>=20
> Original Text
> -------------
> Others to want mitigate the difficulty of finding certificates from =
outside the enterprise.
>=20
> Corrected Text
> --------------
> Others want to mitigate the difficulty of finding certificates from =
outside the enterprise.
>=20
> Notes
> -----
> Wrong order of words.
>=20
> Instructions:
> -------------
> This erratum is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party =20
> can log in to change the status and edit the report, if necessary.=20
>=20
> --------------------------------------
> RFC8162 (draft-ietf-dane-smime-16)
> --------------------------------------
> Title               : Using Secure DNS to Associate Certificates with =
Domain Names for S/MIME
> Publication Date    : May 2017
> Author(s)           : P. Hoffman, J. Schlyter
> Category            : EXPERIMENTAL
> Source              : DNS-based Authentication of Named Entities
> Area                : Security
> Stream              : IETF
> Verifying Party     : IESG


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From nobody Wed Apr 14 16:36:44 2021
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Subject: Re: [dane] [Ext] [Editorial Errata Reported] RFC8162 (6544)
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I agree with Paul=20

> On Apr 14, 2021, at 2:24 PM, Paul Hoffman <paul.hoffman@icann.org> =
wrote:
>=20
> This is correct, and can be marked as simply editorial.
>=20
> --Paul Hoffman
>=20
>> On Apr 14, 2021, at 5:17 AM, RFC Errata System =
<rfc-editor@rfc-editor.org> wrote:
>>=20
>> The following errata report has been submitted for RFC8162,
>> "Using Secure DNS to Associate Certificates with Domain Names for =
S/MIME".
>>=20
>> --------------------------------------
>> You may review the report below and at:
>> =
https://urldefense.com/v3/__https://www.rfc-editor.org/errata/eid6544__;!!=
PtGJab4!r1otOc1PXUoFRkWg2JBSnI8i4wWCmIFklD9io6yBqfYaC5fYw-e71lLmM7rPbeoj0-=
6JJMHj4g$=20
>>=20
>> --------------------------------------
>> Type: Editorial
>> Reported by: Kaspar Etter <me@kasparetter.com>
>>=20
>> Section: 1
>>=20
>> Original Text
>> -------------
>> Others to want mitigate the difficulty of finding certificates from =
outside the enterprise.
>>=20
>> Corrected Text
>> --------------
>> Others want to mitigate the difficulty of finding certificates from =
outside the enterprise.
>>=20
>> Notes
>> -----
>> Wrong order of words.
>>=20
>> Instructions:
>> -------------
>> This erratum is currently posted as "Reported". If necessary, please
>> use "Reply All" to discuss whether it should be verified or
>> rejected. When a decision is reached, the verifying party =20
>> can log in to change the status and edit the report, if necessary.=20
>>=20
>> --------------------------------------
>> RFC8162 (draft-ietf-dane-smime-16)
>> --------------------------------------
>> Title               : Using Secure DNS to Associate Certificates with =
Domain Names for S/MIME
>> Publication Date    : May 2017
>> Author(s)           : P. Hoffman, J. Schlyter
>> Category            : EXPERIMENTAL
>> Source              : DNS-based Authentication of Named Entities
>> Area                : Security
>> Stream              : IETF
>> Verifying Party     : IESG
>=20

