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Date: Tue, 09 Mar 2010 11:36:37 -0700
From: Peter Saint-Andre <stpeter@stpeter.im>
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Subject: [certid] Fwd: I-D Action:draft-saintandre-tls-server-id-check-03.txt
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--------------ms030405070907010604050204
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FYI.

-------- Original Message --------
Subject: I-D Action:draft-saintandre-tls-server-id-check-03.txt
Date: Mon,  8 Mar 2010 13:00:01 -0800 (PST)
From: Internet-Drafts@ietf.org
Reply-To: internet-drafts@ietf.org
To: i-d-announce@ietf.org

A New Internet-Draft is available from the on-line Internet-Drafts
directories.

	Title           : Representation and Verification of Application Server
Identity in Certificates Used with Transport Layer Security (TLS)
	Author(s)       : P. Saint-Andre, J. Hodges
	Filename        : draft-saintandre-tls-server-id-check-03.txt
	Pages           : 27
	Date            : 2010-03-08

Many application technologies enable a secure connection between two
entities using certificates in the context of Transport Layer
Security (TLS).  This document specifies procedures for representing
and verifying the identity of application servers in such
interactions.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-saintandre-tls-server-id-check-=
03.txt



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From simon@josefsson.org  Wed Mar 10 00:29:16 2010
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Date: Wed, 10 Mar 2010 09:29:13 +0100
In-Reply-To: <4B969728.3090907@stpeter.im> (Peter Saint-Andre's message of "Tue, 09 Mar 2010 11:44:56 -0700")
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Subject: Re: [certid] representation and verification of identity in certificates
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Peter Saint-Andre <stpeter@stpeter.im> writes:

> A small, informal design team has been working on an I-D that attempts
> to define recommended procedures for representing and verifying server
> identities in X.509 certificates intended for use in applications that
> employ TLS. We have just published version -03 of that I-D:
>
> http://tools.ietf.org/html/draft-saintandre-tls-server-id-check-03

Thanks for this document, it is useful.

Did you consider discussing name check rules for OpenPGP based
certificate validation as well?  That is currently an underspecified
area, and GnuTLS had to just pick one reasonable algorithm here.

If this is not in scope, I think it would help to clarify the scope of
your document if the term 'X.509' was mentioned in the abstract and in
section '1.2 Scope'.

/Simon

From phoffman@imc.org  Wed Mar 10 08:37:13 2010
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Subject: Re: [certid] representation and verification of identity in certificates
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At 9:29 AM +0100 3/10/10, Simon Josefsson wrote:
>Did you consider discussing name check rules for OpenPGP based
>certificate validation as well?  That is currently an underspecified
>area, and GnuTLS had to just pick one reasonable algorithm here.
>
>If this is not in scope, I think it would help to clarify the scope of
>your document if the term 'X.509' was mentioned in the abstract and in
>section '1.2 Scope'.

Let's keep this to PKIX (not X.509, which lacks some of the alt attributes needed in the discussion) and also not include OpenPGP. Note, however, that we might learn something from the successes and failures in the OpenPGP world.

From stpeter@stpeter.im  Wed Mar 10 08:47:01 2010
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--------------ms020504080203070906090103
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On 3/10/10 9:37 AM, Paul Hoffman wrote:
> At 9:29 AM +0100 3/10/10, Simon Josefsson wrote:
>> Did you consider discussing name check rules for OpenPGP based=20
>> certificate validation as well?  That is currently an
>> underspecified area, and GnuTLS had to just pick one reasonable
>> algorithm here.
>>=20
>> If this is not in scope, I think it would help to clarify the scope
>> of your document if the term 'X.509' was mentioned in the abstract
>> and in section '1.2 Scope'.
>=20
> Let's keep this to PKIX (not X.509, which lacks some of the alt
> attributes needed in the discussion) and also not include OpenPGP.
> Note, however, that we might learn something from the successes and
> failures in the OpenPGP world.=20

The authors have consciously limited the scope of the document, at times
only because wiser heads insisted on it. While related problems are
interesting (IPsec, OpenPGP, client certs), I think we'll need to work
on those in separate documents. Perhaps someday we'll have a grand
unified theory of identity in certs/keys/etc., but not yet. :)

Peter

--=20
Peter Saint-Andre
https://stpeter.im/




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From: Ludwig Nussel <ludwig.nussel@suse.de>
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        Brian Stafford <brian@stafford.uklinux.net>
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        Pawel Salek <pawsa@theochem.kth.se>, jskarvad@redhat.com
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ArkanoiD wrote:
> And according to the draft we MUST ignore non-leaf value even if
> it is the only one CN, just incorrectly placed.

Many self-signed certificates seem to have an email address as leaf
RDN. I guess that's because openssl's CA.sh asks for the mail
address. So with that additional constraint the scary warning
dialogs for self-signed certs are going to be even more confusing in
the future.

cu
Ludwig

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On 3/17/10 7:43 AM, ArkanoiD wrote:

> Many self-signed certificates seem to have an email address as leaf
> RDN.

This I-D does not cover self-signed certs, only CA-issued certs.

Peter

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--------------ms030503030109080200010103--

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Subject: [certid] additional security consideration
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Second level domain MUST NOT be wildcarded, thus *.com is invalid and should
never match. (as well as "*", of course)

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Subject: Re: [certid] additional security consideration
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On 3/17/10 10:07 PM, ArkanoiD wrote:
> Second level domain MUST NOT be wildcarded, thus *.com is invalid and s=
hould
> never match. (as well as "*", of course)

Good point. We seem to have assumed that one...

Peter

--=20
Peter Saint-Andre
https://stpeter.im/




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--------------ms020508090408030303040806--

From ark@eltex.net  Wed Mar 17 21:58:19 2010
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Date: Thu, 18 Mar 2010 07:58:25 +0300
From: ArkanoiD <ark@eltex.net>
To: Peter Saint-Andre <stpeter@stpeter.im>
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Subject: Re: [certid] It is not always a good idea to enforce CN check as leaf	RDN only
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Well, when it comes to implementation we get *two* matching algorithms then,
which is definitely no good ;-). What is the rationale of enforcing CN to
be leaf RDN?

On Wed, Mar 17, 2010 at 09:59:46PM -0600, Peter Saint-Andre wrote:
> On 3/17/10 7:43 AM, ArkanoiD wrote:
> 
> > Many self-signed certificates seem to have an email address as leaf
> > RDN.
> 
> This I-D does not cover self-signed certs, only CA-issued certs.


From jorton@redhat.com  Thu Mar 18 03:10:35 2010
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From: Joe Orton <jorton@redhat.com>
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Subject: Re: [certid] It is not always a good idea to enforce CN check as leaf RDN only
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On Wed, Mar 17, 2010 at 04:43:27PM +0300, ArkanoiD wrote:
> Many self-signed certificates seem to have an email address as leaf
> RDN. I guess that's because openssl's CA.sh asks for the mail
> address. So with that additional constraint the scary warning
> dialogs for self-signed certs are going to be even more confusing in
> the future.

I agree with this; I can't think of any motivation for restricting the 
CN to only the most specific RDN.  To quantify whether or not it happens 
"in the wild", I looked at Johnathan Nightingale's database of SSL 
certs:

  http://blog.johnath.com/2009/01/21/ssl-information-wants-to-be-free/

The "top 10K sites" database has 2986 certs from public servers.  
Breaking down the tag of the most specific ("leaf") RDN in the Subject 
of each cert gives:

TAG         COUNT  % of TOTAL
C               9   0%
CN           2333  78%
emailAddress  596  19%
O               1   0%
OU             31   1%
serialNumber   10   0%
ST              6   0%

The draft looks good otherwise, BTW.

Regards, Joe

From Bruno.Harbulot@manchester.ac.uk  Thu Mar 18 04:07:25 2010
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Subject: Re: [certid] It is not always a good idea to enforce CN check as leaf	RDN only
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On 18/03/2010 03:59, Peter Saint-Andre wrote:
> On 3/17/10 7:43 AM, ArkanoiD wrote:
>
>> Many self-signed certificates seem to have an email address as leaf
>> RDN.
>
> This I-D does not cover self-signed certs, only CA-issued certs.

I'm not sure this I-D should treat self-signed certs completely 
differently from CA-issued certs. Self-signed certs could be considered 
as a special case of CA-issued certs.
I think the logic of verifying the identity of the server ought to be 
separate from the logic of verifying trust in a certificate (although 
the latter could impose constraints on the former depending on policies).


This problem isn't just for self-signed certificate.

For you information, the UK e-Science CA [1] emits certificates for 
hosts with an e-mail address as leaf RDN, for example ('openssl x509' 
notation -> leaf is right-most):

C=UK, O=eScience, OU=Authority, L=CLRC, CN=ca.grid-support.ac.uk, 
emailAddress=ca@grid-support.ac.uk

All the host certificates I've seen for this CA have an e-mail address 
as leaf.


Independently, I recently got a certificate like this, issued by the 
JANET CA [2] (compatible with most browsers out of the box):

- Subject: CN=foafssl.vidar.ngs.manchester.ac.uk, C=GB, L=Manchester, 
O=The University of Manchester, OU=Research Computing Services, 
CN=foafssl.ngs.manchester.ac.uk
- X509v3 Subject Alternative Name:
     DNS:foafssl.ngs.manchester.ac.uk,
     DNS:foafssl.vidar.ngs.manchester.ac.uk

While I must admit I was surprised to see a CN either side, it doesn't 
really matter; it's still fine with the RFC 2818 rule and the fact that 
the host name is also in the Subject DN's CNs is irrelevant:

>    If a subjectAltName extension of type dNSName is present, that MUST
>    be used as the identity. Otherwise, the (most specific) Common Name
>    field in the Subject field of the certificate MUST be used. Although
>    the use of the Common Name is existing practice, it is deprecated and
>    Certification Authorities are encouraged to use the dNSName instead.


However, the wording in draft-saintandre-tls-server-id-check-03 seems to 
suggest it could really not be acceptable to have the host name in the 
CN at all if it's not in the leaf, irrespectively of whether the CN is 
going to be checked because there's a subjectAltName in this case (it 
somehow depends on the interpretation of "represent" here):

> The certificate MUST NOT represent the server's domain name in an
>        identity of Common Name (CN) where the CN is in something other
>        than the "leaf" (left-most) position within the Relative
>        Distinguished Names (RDNs) of the subjectName.



More fundamentally, this rule would break compatibility with the 
existing specifications (RFC 2818 in the case of HTTPS). While I think 
this draft is a good idea in principle, for harmonising the host name 
verification across protocols and having a few new features, I can't see 
what's wrong with RFC 2818's model in this case.
If non-leaf CN's really is a problem, the draft should make a strong 
case for banning them, as it would introduce further constrains on the 
existing rules, and potentially break compatibility.




Best wishes,

Bruno.


[1] https://ca.grid-support.ac.uk/
[2] http://www.ja.net/services/jcs/index.html

From bil@corry.biz  Thu Mar 18 12:21:07 2010
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Bruno Harbulot wrote on 3/18/2010 4:07 AM: 
> On 18/03/2010 03:59, Peter Saint-Andre wrote:
>> On 3/17/10 7:43 AM, ArkanoiD wrote:
>>
>>> Many self-signed certificates seem to have an email address as leaf
>>> RDN.
>>
>> This I-D does not cover self-signed certs, only CA-issued certs.
> 
> I'm not sure this I-D should treat self-signed certs completely
> differently from CA-issued certs. Self-signed certs could be considered
> as a special case of CA-issued certs.
> I think the logic of verifying the identity of the server ought to be
> separate from the logic of verifying trust in a certificate (although
> the latter could impose constraints on the former depending on policies).

I agree.  Isn't the distinction between CA-issued certs and self-signed certs more-or-less which CAs you choose to trust?


- Bil


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Subject: [certid] draft slides for IETF 77
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I've been asked to make a presentation about our work to the PKIX WG
session on Monday at 15:20 Pacific. Draft slides are attached and
feedback is welcome -- this is mostly just an overview to get people
interested in reviewing the I-D and providing feedback.

Peter

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Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"
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--------------ms080304070605060202080805--

From jorton@redhat.com  Thu Mar 18 12:51:00 2010
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Date: Thu, 18 Mar 2010 19:50:37 +0000
From: Joe Orton <jorton@redhat.com>
To: ArkanoiD <ark@eltex.net>
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On Thu, Mar 18, 2010 at 07:07:31AM +0300, ArkanoiD wrote:
> Second level domain MUST NOT be wildcarded, thus *.com is invalid and should
> never match. (as well as "*", of course)

I don't think it's appropriate for the draft to specify any requirement 
beyond the "left-most label" rule, so far as wildcards go.  I could 
imagine a "*.local" or similar could be useful to allow, and *.com is 
really little more dangerous than *.co.uk.  Yet *.blah.fr is fine.  And 
so on.  The rules could get stupidly complicated really quickly if you 
go down this road.

So, I would just leave it at the "left-most label" rule.  Having a 
simple rule like this is sufficient for interoperability purposes, which 
is the end goal here.  It will remain up to the CAs to validate CN 
sanity beyond that.

Regards, Joe

From michael@stroeder.com  Thu Mar 18 12:54:31 2010
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Joe Orton wrote:
> On Thu, Mar 18, 2010 at 07:07:31AM +0300, ArkanoiD wrote:
>> Second level domain MUST NOT be wildcarded, thus *.com is invalid and should
>> never match. (as well as "*", of course)
> 
> I don't think it's appropriate for the draft to specify any requirement 
> beyond the "left-most label" rule, so far as wildcards go.  I could 
> imagine a "*.local" or similar could be useful to allow, and *.com is 
> really little more dangerous than *.co.uk.

Good point with *.co.uk but I'd draw the opposite conclusion from it:
I'd rather like to see wildcards forbidden completely or at least strongly
discouraged.

Ciao, Michael.

From jorton@redhat.com  Thu Mar 18 13:26:44 2010
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From: Joe Orton <jorton@redhat.com>
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On Thu, Mar 18, 2010 at 08:54:36PM +0100, Michael Ströder wrote:
> Joe Orton wrote:
> > On Thu, Mar 18, 2010 at 07:07:31AM +0300, ArkanoiD wrote:
> >> Second level domain MUST NOT be wildcarded, thus *.com is invalid and should
> >> never match. (as well as "*", of course)
> > 
> > I don't think it's appropriate for the draft to specify any requirement 
> > beyond the "left-most label" rule, so far as wildcards go.  I could 
> > imagine a "*.local" or similar could be useful to allow, and *.com is 
> > really little more dangerous than *.co.uk.
> 
> Good point with *.co.uk but I'd draw the opposite conclusion from it:
> I'd rather like to see wildcards forbidden completely or at least strongly
> discouraged.

I don't agree, wildcard certs are very useful in some circumstances.

In any case, I'd hope the goal for this draft is to document current 
best practice, not to move mountains.  Trying to impose a "no wildcards" 
rule without broad consensus from CAs and the browser vendors (good luck 
with that) would harm rather than improve interop.

Regards, Joe

From michael@stroeder.com  Thu Mar 18 13:50:16 2010
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Joe Orton wrote:
> On Thu, Mar 18, 2010 at 08:54:36PM +0100, Michael Ströder wrote:
>> Joe Orton wrote:
>>> On Thu, Mar 18, 2010 at 07:07:31AM +0300, ArkanoiD wrote:
>>>> Second level domain MUST NOT be wildcarded, thus *.com is invalid and should
>>>> never match. (as well as "*", of course)
>>>
>>> I don't think it's appropriate for the draft to specify any requirement 
>>> beyond the "left-most label" rule, so far as wildcards go.  I could 
>>> imagine a "*.local" or similar could be useful to allow, and *.com is 
>>> really little more dangerous than *.co.uk.
>>
>> Good point with *.co.uk but I'd draw the opposite conclusion from it:
>> I'd rather like to see wildcards forbidden completely or at least strongly
>> discouraged.
> 
> I don't agree, wildcard certs are very useful in some circumstances.
> 
> In any case, I'd hope the goal for this draft is to document current 
> best practice,

Whatever one considers to be best practice...

> Trying to impose a "no wildcards" 
> rule without broad consensus from CAs and the browser vendors (good luck 
> with that) would harm rather than improve interop.

Why do you assume that there is broad consensus from CAs and the browser
vendors for wildcard certs?

https://wiki.mozilla.org/CA:Problematic_Practices#Wildcard_DV_SSL_certificates

Ciao, Michael.

From phoffman@imc.org  Thu Mar 18 14:05:10 2010
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At 1:28 PM -0600 3/18/10, Peter Saint-Andre wrote:
>Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms080304070605060202080805"
>
>I've been asked to make a presentation about our work to the PKIX WG
>session on Monday at 15:20 Pacific. Draft slides are attached and
>feedback is welcome -- this is mostly just an overview to get people
>interested in reviewing the I-D and providing feedback.

In slide 3: s/PKI/PKIX. OpenPGP has its own (unspecified) PKI.

But, more importantly in slide 3: Bullets 2, 3, and 5 disagree with each other. A server is a machine; it is not a domain or a URI. A domain name is not a URI. And so on. Consider adding a bullet saying "this is known to be unclear".


From shuque@isc.upenn.edu  Thu Mar 18 14:20:55 2010
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From: Shumon Huque <shuque@isc.upenn.edu>
To: Paul Hoffman <phoffman@imc.org>
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On Thu, Mar 18, 2010 at 02:05:15PM -0700, Paul Hoffman wrote:
> At 1:28 PM -0600 3/18/10, Peter Saint-Andre wrote:
> >Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms080304070605060202080805"
> >
> >I've been asked to make a presentation about our work to the PKIX WG
> >session on Monday at 15:20 Pacific. Draft slides are attached and
> >feedback is welcome -- this is mostly just an overview to get people
> >interested in reviewing the I-D and providing feedback.
> 
> In slide 3: s/PKI/PKIX. OpenPGP has its own (unspecified) PKI.
> 
> But, more importantly in slide 3: Bullets 2, 3, and 5 disagree with each other. A server is a machine; it is not a domain or a URI. A domain name is not a URI. And so on. Consider adding a bullet saying "this is known to be unclear".
> 

I think "server" here refers not to a machine or set of machines,
but to an "application service" (application server?), ie. the server
side component of a client-server protocol.

This application service can be represented in a number of different
ways: domain name, URI, SRVname, etc.

I'd just get rid of the 3rd bullet: "Domains only (no IP addresses)".
The draft isn't about domain names only, since it talks about other
identity types (although the ones mentioned usually have a domain
name component or look like one).

--Shumon.

From stpeter@stpeter.im  Thu Mar 18 21:47:33 2010
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This is a cryptographically signed message in MIME format.

--------------ms020809090805060104010509
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

On 3/18/10 3:20 PM, Shumon Huque wrote:
> On Thu, Mar 18, 2010 at 02:05:15PM -0700, Paul Hoffman wrote:
>> At 1:28 PM -0600 3/18/10, Peter Saint-Andre wrote:
>>> Content-Type: multipart/signed;
>>> protocol=3D"application/pkcs7-signature"; micalg=3Dsha1;
>>> boundary=3D"------------ms080304070605060202080805"
>>>=20
>>> I've been asked to make a presentation about our work to the PKIX
>>> WG session on Monday at 15:20 Pacific. Draft slides are attached
>>> and feedback is welcome -- this is mostly just an overview to get
>>> people interested in reviewing the I-D and providing feedback.
>>=20
>> In slide 3: s/PKI/PKIX. OpenPGP has its own (unspecified) PKI.
>>=20
>> But, more importantly in slide 3: Bullets 2, 3, and 5 disagree with
>> each other. A server is a machine; it is not a domain or a URI. A
>> domain name is not a URI. And so on. Consider adding a bullet
>> saying "this is known to be unclear".
>>=20
>=20
> I think "server" here refers not to a machine or set of machines, but
> to an "application service" (application server?), ie. the server=20
> side component of a client-server protocol.

Correct.

> This application service can be represented in a number of different=20
> ways: domain name, URI, SRVname, etc.
>=20
> I'd just get rid of the 3rd bullet: "Domains only (no IP
> addresses)". The draft isn't about domain names only, since it talks
> about other identity types (although the ones mentioned usually have
> a domain name component or look like one).

Right, which is why I had thought that we were strictly talking about
domain names or things that include domain names, not IP addresses.

Peter

--=20
Peter Saint-Andre
https://stpeter.im/




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From phoffman@imc.org  Fri Mar 19 08:32:40 2010
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Date: Fri, 19 Mar 2010 08:32:49 -0700
To: Peter Saint-Andre <stpeter@stpeter.im>, Shumon Huque <shuque@isc.upenn.edu>
From: Paul Hoffman <phoffman@imc.org>
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Subject: Re: [certid] draft slides for IETF 77
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At 10:47 PM -0600 3/18/10, Peter Saint-Andre wrote:
>On 3/18/10 3:20 PM, Shumon Huque wrote:
>> On Thu, Mar 18, 2010 at 02:05:15PM -0700, Paul Hoffman wrote:
>>> At 1:28 PM -0600 3/18/10, Peter Saint-Andre wrote:
>>>> Content-Type: multipart/signed;
>>>> protocol="application/pkcs7-signature"; micalg=sha1;
>>>> boundary="------------ms080304070605060202080805"
>>>>
>>>> I've been asked to make a presentation about our work to the PKIX
>>>> WG session on Monday at 15:20 Pacific. Draft slides are attached
>>>> and feedback is welcome -- this is mostly just an overview to get
>>>> people interested in reviewing the I-D and providing feedback.
>>>
>>> In slide 3: s/PKI/PKIX. OpenPGP has its own (unspecified) PKI.
>>>
>>> But, more importantly in slide 3: Bullets 2, 3, and 5 disagree with
>>> each other. A server is a machine; it is not a domain or a URI. A
>>> domain name is not a URI. And so on. Consider adding a bullet
>>> saying "this is known to be unclear".
>>>
>>
>> I think "server" here refers not to a machine or set of machines, but
>> to an "application service" (application server?), ie. the server
>> side component of a client-server protocol.
>
>Correct.

A public key listed in a certificate is associated with *something* that has access to the associated private key. The machine has access to that private key, as does the server application/daemon. If you want to make this distinction, you need to do so much more clearly in the draft.

From stpeter@stpeter.im  Fri Mar 19 12:49:14 2010
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On 3/18/10 1:28 PM, Peter Saint-Andre wrote:
> I've been asked to make a presentation about our work to the PKIX WG
> session on Monday at 15:20 Pacific. Draft slides are attached and
> feedback is welcome -- this is mostly just an overview to get people
> interested in reviewing the I-D and providing feedback.

I've reworked the slides based on feedback. See attached.

Peter

--=20
Peter Saint-Andre
https://stpeter.im/



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Content-Transfer-Encoding: base64
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From stpeter@stpeter.im  Fri Mar 19 12:50:32 2010
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Subject: Re: [certid] draft slides for IETF 77
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On 3/19/10 9:32 AM, Paul Hoffman wrote:
> At 10:47 PM -0600 3/18/10, Peter Saint-Andre wrote:
>> On 3/18/10 3:20 PM, Shumon Huque wrote:
>>> On Thu, Mar 18, 2010 at 02:05:15PM -0700, Paul Hoffman wrote:
>>>> At 1:28 PM -0600 3/18/10, Peter Saint-Andre wrote:
>>>>> Content-Type: multipart/signed;=20
>>>>> protocol=3D"application/pkcs7-signature"; micalg=3Dsha1;=20
>>>>> boundary=3D"------------ms080304070605060202080805"
>>>>>=20
>>>>> I've been asked to make a presentation about our work to the
>>>>> PKIX WG session on Monday at 15:20 Pacific. Draft slides are
>>>>> attached and feedback is welcome -- this is mostly just an
>>>>> overview to get people interested in reviewing the I-D and
>>>>> providing feedback.
>>>>=20
>>>> In slide 3: s/PKI/PKIX. OpenPGP has its own (unspecified) PKI.
>>>>=20
>>>> But, more importantly in slide 3: Bullets 2, 3, and 5 disagree
>>>> with each other. A server is a machine; it is not a domain or a
>>>> URI. A domain name is not a URI. And so on. Consider adding a
>>>> bullet saying "this is known to be unclear".
>>>>=20
>>>=20
>>> I think "server" here refers not to a machine or set of machines,
>>> but to an "application service" (application server?), ie. the
>>> server side component of a client-server protocol.
>>=20
>> Correct.
>=20
> A public key listed in a certificate is associated with *something*
> that has access to the associated private key. The machine has access
> to that private key, as does the server application/daemon. If you
> want to make this distinction, you need to do so much more clearly in
> the draft.

Paul, I agree that this needs to be clearer in the I-D. I've added a
slide on this point and will discuss it at the PKIX session, then fix up
the I-D as soon as possible after Anaheim.

Peter

--=20
Peter Saint-Andre
https://stpeter.im/




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--------------ms060407020809070305050607--

From ludwig.nussel@suse.de  Tue Mar 23 07:00:06 2010
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From: Ludwig Nussel <ludwig.nussel@suse.de>
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Subject: [certid] URI match
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Hi,

What's the purpose of URIs in subjAltnames? Are they meant for
things like "https://example.com/"?

If so, does "telnet://example.com/" match "https://example.com/"? I
guess not as the URI schemes are different. The exact matching rules
for URIs are not defined in the I-D though.

The I-D allows multiple different types in subjAltnames so I guess
it's legal to have subjAltnames of type dNSName and
uniformResourceIdentifier in the same certificate. So a subjAltname
'URI:telnet://example.com/, DNS:example.com' would be valid. Assume
the user wants to connect to a server with that subjAltname and
enters 'https://example.com/' in the browser. Should that succeed?
Again I guess the URI doesn't match. However, when mapping the URI
to the host part only the dNSName would match and the connection
succeeds. Also, clients that don't support URIs in subjAltnames (as
almost all software out there) would ignore the URI and match
dNSName only.

So, without defining further constraints an URI in subjAltnames is
rather useless, isn't it?

cu
Ludwig

-- 
 (o_   Ludwig Nussel
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From ludwig.nussel@suse.de  Tue Mar 23 07:43:59 2010
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From: Ludwig Nussel <ludwig.nussel@suse.de>
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Hi,

| If and only if the identity set does not include subjectAltName
| extensions of type dNSName, SRVName, uniformResourceIdentifier (or
| other application-specific subjectAltName extensions), the client MAY
| as a fallback check the value of the Common Name (CN)

What about rewording that to the following?

| If and only if the certificate does not include any subjectAltName
| extensions, the client MAY as a fallback check the value of the
| Common Name (CN)

That would avoid having generic implementations look into the CN as
fallback when it doesn't make sense. iPAddress for example isn't
specified by the I-D (why anyways?). So a conforming implementation
could use the CN when looking for a hostname even if a
subjectAltName of type iPAddress is present.

cu
Ludwig

-- 
 (o_   Ludwig Nussel
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From Bruno.Harbulot@manchester.ac.uk  Tue Mar 23 08:11:38 2010
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Hi Ludwig,

We've been using URIs in subjectAltName in FOAF+SSL 
<http://esw.w3.org/Foaf%2Bssl> (currently only for client-certificate 
authentication).

FOAF+SSL is an authentication mechanism that provides global 
identifiers, typically the URI of a Person using semantic web technology 
(we call such a URI a 'WebID').
One of the objectives is to rely on social networks to make 
authentication and authorisation decisions. In principle, you can have 
both hierarchical and decentralised models to assert and verify the 
identity of an agent.

Just to give a bit of background, this relies on FOAF [1] 
(Friend-of-a-Friend), which is an RDF vocabulary to describe people, 
organisations and relations between them.
For example, my WebID is <http://www.harbulot.com/foaf/bruno#me>. If you 
get this document, you'll get a description saying that:
    <http://www.harbulot.com/foaf/bruno#me> is a foaf:Person
and some semantic description that binds a public key to it.
RDF allows you to build graphs made of statements like this, which can 
then be processed and reasoned about by a machine.

FOAF can be used to write statements like "someone knows someone" and 
"someone belongs to this organisation", for example. This allows for 
modelling peer-to-peer models of trusts as well as more hierarchical ones.


What we do is embedding the WebID in an X.509 certificate (which may or 
may not be self-signed) and replace the trust model on the server side, 
not to use PKIX.

When the client connects to the server, the server knows that the client 
has the private key for the certificate's public key (via the TLS 
handshake), irrespectively of whether the certificate is trusted or not.

Then, the server needs to check how it trusts this certificate to 
perform the authentication.
In its simplest form, we do an HTTP GET on the URI itself to get the 
FOAF document at that WebID. In turns, this document contains a graph 
that links the WebID to a public key: we verify that this matches the 
public key in the certificate. This level of assurance relies on the 
control over the hosting of this URI (and this is sufficient for a 
number of applications).
Alternatively, we've been working on signing parts of such graphs, or 
how to get better level of assurances by getting these graphs from 
better trusted sources.

This allows for the discovery of information related to an identifier, 
via the (semantic) web, as well as the decoupling of identifier and 
assertions made about an identifier.


While this is mainly targeted at client certificates, the WebID is in 
principle that of a foaf:Agent ("An agent (eg. person, group, software 
or physical artifact)." [2]), foaf:Person being a specialisation of 
foaf:Agent, so this might be usable for server certificates one day 
(although there's a bootstrapping issue then).
We still rely on traditional PKI and HTTPS hostname matching for the 
verification of the server's identity.



More generally, URIs have the advantage that they're universal 
identifiers, not just URLs. A URI identifies something, which may or may 
not resolve when you point a browser at it. On that basis, URIs in a 
cert could identify the signer (whatever that is), although verifying 
how you tie that thing to this identity would certainly fall outside the 
scope of this I-D if you can't get that URI.
If there's a service behind that URI, it would seem appropriate to use 
that (again, probably more useful for some message-level security, 
rather than TLS).
In principle the server (machine or daemon) itself could have access to 
the private key, but it's then a matter of making explicit what entity 
or sub-entity is referred to. That's the same problem as mentioned by 
Paul Hoffman in the previous thread; you could just dig further than the 
daemon and refer to what's specifically behind that URI I guess (e.g. a 
specific webapp):
> A public key listed in a certificate is associated with *something*
> that has access to the associated private key. The machine has access
> to that private key, as does the server application/daemon. If you
> want to make this distinction, you need to do so much more clearly in
> the draft.


Best wishes,

Bruno.


[1] http://www.foaf-project.org/
[2] http://xmlns.com/foaf/spec/#term_Agent

Ludwig Nussel wrote:
> Hi,
> 
> What's the purpose of URIs in subjAltnames? Are they meant for
> things like "https://example.com/"?
> 
> If so, does "telnet://example.com/" match "https://example.com/"? I
> guess not as the URI schemes are different. The exact matching rules
> for URIs are not defined in the I-D though.
> 
> The I-D allows multiple different types in subjAltnames so I guess
> it's legal to have subjAltnames of type dNSName and
> uniformResourceIdentifier in the same certificate. So a subjAltname
> 'URI:telnet://example.com/, DNS:example.com' would be valid. Assume
> the user wants to connect to a server with that subjAltname and
> enters 'https://example.com/' in the browser. Should that succeed?
> Again I guess the URI doesn't match. However, when mapping the URI
> to the host part only the dNSName would match and the connection
> succeeds. Also, clients that don't support URIs in subjAltnames (as
> almost all software out there) would ignore the URI and match
> dNSName only.
> 
> So, without defining further constraints an URI in subjAltnames is
> rather useless, isn't it?
> 
> cu
> Ludwig
> 

From Jeff.Hodges@KingsMountain.com  Wed Mar 24 14:07:58 2010
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Subject: [certid] fyi: paper on compelled, certificate creation attack and applicable appliance
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Abstract

This paper introduces a new attack, the
compelled certificate creation attack, in which
government agencies compel a certificate au-
thority to issue false SSL certificates that are
then used by intelligence agencies to covertly
intercept and hijack individuals' secure Web-
based communications. We reveal alarming ev-
idence that suggests that this attack is in ac-
tive use. Finally, we introduce a lightweight
browser add-on that detects and thwarts such
attacks.


------- Forwarded Message

Date:    Wed, 24 Mar 2010 15:34:27 -0400
From:    Dave Farber <dave@farber.net>
To:      "ip" <ip@v2.listbox.com>
Subject: [IP] Surveillance via bogus SSL certificates

Begin forwarded message:

 > From: Matt Blaze <mab@crypto.com>
 > Date: March 24, 2010 3:09:19 PM EDT
 > To: Dave Farber <dave@farber.net>
 > Subject: Surveillance via bogus SSL certificates
 >

 > Dave,
 >
 > For IP if you'd like.
 >
 > Over a decade ago, I observed that commercial certificate
 > authorities protect you from anyone from whom they are unwilling to
 > take money.  That turns out to be wrong; they don't even do that.
 >
 > Chris Soghoian and Sid Stamm published a paper today that describes
 > a simple "appliance"-type box, marketed to law enforcement and
 > intelligence agencies in the US and elsewhere, that uses bogus
 > certificates issued by *any* cooperative certificate authority to
 > act as a "man-in-the-middle" for encrypted web traffic.
 >
 > Their paper is available at http://files.cloudprivacy.net/ssl-mitm.pdf
 >
 > What I found most interesting (and surprising) is that this sort of
 > surveillance is widespread enough to support fairly mature, turnkey
 > commercial products.    It carries some significant disadvantages
 > for law enforcement -- most particularly it can be potentially can
 > be detected.
 >
 > I briefly discuss the implications of this kind of surveillance at http://www
.crypto.com/blog/spycerts/
 >
 > Also, Wired has a story here: http://www.wired.com/threatlevel/2010/03/packet
- -forensics/
 >
 >
 > -matt
 >
 >
 >



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From ynir@checkpoint.com  Wed Mar 24 16:25:50 2010
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From: Yoav Nir <ynir@checkpoint.com>
To: "tls@ietf.org Group" <tls@ietf.org>
Date: Thu, 25 Mar 2010 01:21:07 +0200
Thread-Topic: [TLS] fyi: paper on compelled, certificate creation attack and applicable appliance
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Oh, where do I start.

1. This is not a new attack. If you can get a CA to issue a bad certificate=
, you can then use that certificate to impersonate the legitimate web site.=
 Government co-ercion does not make this a new attack, and the results are =
no different from a CA employee being coerced or bribed by criminals.

2. Section 5 is entitled "evidence", and then goes on to present the eviden=
ce: a marketing brochure and something someone told him at a booth in a tra=
de show.

3. Section 6 is ominously entitled "Some CAs Already Participate In Surveil=
lance". I read that expecting more of a smoking gun than that guy in a trad=
e show from section 5. Instead, we go straight to naming names, in section =
6.1, "Verisign". Naming and shaming the biggest commercial CA? No. More lik=
e innuendo. The section begins with a description of Verisign's business de=
alings with telecoms and government, with the implication that they're "in =
bed" with the evil governments. So is the evidence coming next. No, and I'l=
l quote:
  We have no evidence to suggest that the CA unit
  within VeriSign has ever been compelled by the US
  government to produce a certi=0Ccate for use by in-
  telligence agencies. Likewise, we have no evidence
  to suggest that VeriSign has ever broken any laws,
  or improperly disclosed consumers' private data to
  government agencies.

4. Lastly there's the solution, which is entirely based on countries. If yo=
ur Chinese bank all of a sudden has an American certificate, the browser kv=
etches. But the prominence of Verisign actually defeats this defense. A lot=
 of companies from various countries buy certificates from Verisign, either=
 through a local Verisign affiliate, or from Verisign US through a US branc=
h or sales office.  Even my own company does that ( https://www.checkpoint.=
com )  This also does not solve the problem, only localizes it. If the gove=
rnment in Elbonia wants a certificate for anything, they will lean on the l=
ocal branch of Verisign (or just bribe an employee) and get a certificate t=
hat chains back to Verisign (US). And criminals will do the same.


On Mar 24, 2010, at 2:08 PM, =3DJeffH wrote:

>=20
> Abstract
>=20
> This paper introduces a new attack, the
> compelled certificate creation attack, in which
> government agencies compel a certificate au-
> thority to issue false SSL certificates that are
> then used by intelligence agencies to covertly
> intercept and hijack individuals' secure Web-
> based communications. We reveal alarming ev-
> idence that suggests that this attack is in ac-
> tive use. Finally, we introduce a lightweight
> browser add-on that detects and thwarts such
> attacks.
>=20
>=20
> ------- Forwarded Message
>=20
> Date:    Wed, 24 Mar 2010 15:34:27 -0400
> From:    Dave Farber <dave@farber.net>
> To:      "ip" <ip@v2.listbox.com>
> Subject: [IP] Surveillance via bogus SSL certificates
>=20
> Begin forwarded message:
>=20
>> From: Matt Blaze <mab@crypto.com>
>> Date: March 24, 2010 3:09:19 PM EDT
>> To: Dave Farber <dave@farber.net>
>> Subject: Surveillance via bogus SSL certificates
>>=20
>=20
>> Dave,
>>=20
>> For IP if you'd like.
>>=20
>> Over a decade ago, I observed that commercial certificate
>> authorities protect you from anyone from whom they are unwilling to
>> take money.  That turns out to be wrong; they don't even do that.
>>=20
>> Chris Soghoian and Sid Stamm published a paper today that describes
>> a simple "appliance"-type box, marketed to law enforcement and
>> intelligence agencies in the US and elsewhere, that uses bogus
>> certificates issued by *any* cooperative certificate authority to
>> act as a "man-in-the-middle" for encrypted web traffic.
>>=20
>> Their paper is available at http://files.cloudprivacy.net/ssl-mitm.pdf
>>=20
>> What I found most interesting (and surprising) is that this sort of
>> surveillance is widespread enough to support fairly mature, turnkey
>> commercial products.    It carries some significant disadvantages
>> for law enforcement -- most particularly it can be potentially can
>> be detected.
>>=20
>> I briefly discuss the implications of this kind of surveillance at http:=
//www
> .crypto.com/blog/spycerts/
>>=20
>> Also, Wired has a story here: http://www.wired.com/threatlevel/2010/03/p=
acket
> - -forensics/
>>=20
>>=20
>> -matt
>>=20
>>=20
>>=20
>=20
>=20
>=20
> - -------------------------------------------
> Archives: https://www.listbox.com/member/archive/247/=3Dnow
> RSS Feed: https://www.listbox.com/member/archive/rss/247/
> Powered by Listbox: http://www.listbox.com
>=20
>=20
> ------- End of Forwarded Message
> _______________________________________________
> TLS mailing list
> TLS@ietf.org
> https://www.ietf.org/mailman/listinfo/tls
>=20
> Scanned by Check Point Total Security Gateway.


From ynir@checkpoint.com  Wed Mar 24 19:22:58 2010
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From: Yoav Nir <ynir@checkpoint.com>
To: Peter Gutmann <pgut001@cs.auckland.ac.nz>
Date: Thu, 25 Mar 2010 04:22:50 +0200
Thread-Topic: [TLS] fyi: paper on compelled, certificate creation attack and applicable appliance
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Subject: Re: [certid] [TLS] fyi: paper on compelled, certificate creation attack and applicable appliance
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On Mar 24, 2010, at 6:41 PM, Peter Gutmann wrote:

> Yoav Nir <ynir@checkpoint.com> writes:
>=20
>> 2. Section 5 is entitled "evidence", and then goes on to present the
>> evidence: a marketing brochure and something someone told him at a booth=
 in a
>> trade show.
>=20
> I've seen the same thing done with a $29 Openmesh box but without the cer=
t
> MITM, it relies on the Hamming distance between an SSL and non-SSL site b=
eing
> so minute that users don't notice, and in practice no-one did.  Worked re=
ally
> well, I have some screenshots of it in action with a banking site and
> Verisign's site-seal in my book draft at
> http://www.cs.auckland.ac.nz/~pgut001/pubs/book.pdf search for "EV
> Certificates: PKI-me-Harder" and scroll down about two pages.  No need to=
 mess
> with SSL's PKI when it doesn't work anyway, read the surrounding text for
> details.
>=20
> Peter.

Interesting stuff.=20

Maybe the STS initiative could defeat those other ways well enough that you=
 really have to mess with SSL's PKI.

http://lists.w3.org/Archives/Public/www-archive/2009Sep/att-0051/draft-hodg=
es-strict-transport-sec-05.plain.html
or
http://en.wikipedia.org/wiki/Strict_Transport_Security


From ark@eltex.net  Wed Mar 24 21:13:47 2010
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Subject: Re: [certid] fyi: paper on compelled, certificate creation attack and applicable appliance
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Well, that's quite obvious that PKI in the "big internet" as we know it is
just a card house: if *ANY* CA we trust get compromised or mailicious, it
is all flawed. There is nothing we can do besides examining chain of trust
manually and watching for certificate changes. The TOFU technology described there is quite obvious, i always wondered why ssh has it and browsers do not.

It is completely out of the scope of the certid list, though :-(


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Subject: Re: [certid] [TLS] fyi: paper on compelled, certificate creation attack and 	applicable appliance
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On Wed, Mar 24, 2010 at 10:22 PM, Yoav Nir <ynir@checkpoint.com> wrote:
> http://lists.w3.org/Archives/Public/www-archive/2009Sep/att-0051/draft-hodges-strict-transport-sec-05.plain.html
> or
> http://en.wikipedia.org/wiki/Strict_Transport_Security

I haven't mentioned this on the list yet, and it's not an answer to
the problems in this papers, but we are actively welcoming entries on
the Preloaded STS list. If you know someone who runs a major HTTPS
site, please mention it.

http://dev.chromium.org/sts:


Preloaded STS sites

There is still a window where a user who has a fresh install, or who
wipes out their local state, is vulnerable. Because of that, we'll be
starting a "Preloaded STS" list. These domains will be configured for
STS out of the box. In the beginning, this will be hardcoded into the
binary. As it (hopefully) grows, it can change into a list this is
shared across browsers, like the safe-browsing database is today.

If you own a site that you would like to see included in the preloaded
STS list, contact agl@chromium.org.

Current members of the preloaded STS list:

    * www.paypal.com



AGL

From stpeter@stpeter.im  Wed Mar 31 14:43:30 2010
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Subject: Re: [certid] CN fallback
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On 3/23/10 8:44 AM, Ludwig Nussel wrote:
> Hi,
>=20
> | If and only if the identity set does not include subjectAltName
> | extensions of type dNSName, SRVName, uniformResourceIdentifier (or
> | other application-specific subjectAltName extensions), the client MAY=

> | as a fallback check the value of the Common Name (CN)
>=20
> What about rewording that to the following?
>=20
> | If and only if the certificate does not include any subjectAltName
> | extensions, the client MAY as a fallback check the value of the
> | Common Name (CN)

I don't see a strong reason to change that text. This specification is
about checking domain names, not IP addresses.

As an aside, I must say that I'm tempted to move everything about CNs to
a separate section, or to remove it entirely, because I don't think it's
a best current practice for secure authentication.

> That would avoid having generic implementations look into the CN as
> fallback when it doesn't make sense. iPAddress for example isn't
> specified by the I-D (why anyways?).=20

1. Do certification authorities issue certificates to IP addresses? The
ones I work with don't (probably because they base their certification
decision on control over the whois data or reserved email addresses for
a domain name).

2. If so, is that a best current practice for secure authentication? I
don't think so.

3. Users don't expect to connect to "192.0.2.7", they expect to connect
to "example.com". That, at least, is one assumption of this I-D. You are
free to write an I-D that specifies rules for representation and
verification of IP addresses in certificates, but that's out of scope
for this I-D.

> So a conforming implementation
> could use the CN when looking for a hostname even if a
> subjectAltName of type iPAddress is present.

Right. But I don't think that is consistent with your proposed text.

Peter

--=20
Peter Saint-Andre
https://stpeter.im/


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Subject: Re: [certid] It is not always a good idea to enforce CN check as leaf	RDN only
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On 3/17/10 10:58 PM, ArkanoiD wrote:
> Well, when it comes to implementation we get *two* matching algorithms =
then,
> which is definitely no good ;-).=20

Given that a self-signed certificate can say *anything*, I don't know
that it's helpful to enforce any rules about issuance and checking of
self-signed certs. It's not as if any "certification" has taken place in
this situation.

> What is the rationale of enforcing CN to
> be leaf RDN?

As I recall, Alexey Melnikov brought that up so I'll ping him about it.

Peter

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Peter Saint-Andre
https://stpeter.im/




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Subject: Re: [certid] URI match
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On 3/23/10 8:00 AM, Ludwig Nussel wrote:
> Hi,
>=20
> What's the purpose of URIs in subjAltnames? Are they meant for
> things like "https://example.com/"?

One example is the Session Initiation Protocol, where the "sips:" URI
scheme is used for matching. See for instance Section 4 of
draft-ietf-sip-domain-certs-06, which has the following text:

   As an example, consider a request that is to be routed to the SIP
   address "sips:alice@example.com".  This address requires a secure
   connection to the SIP domain "example.com" (the 'sips' scheme
   mandates a secure connection).  Through a series of DNS
   manipulations, the domain name is mapped to a set of host addresses
   and transports.  The entity attempting to create the connection
   selects an address appropriate for use with TLS from this set.  When
   the connection is established to that server, the server presents a
   certificate asserting the identity "sip:example.com".  Since the
   domain part of the SIP AUS matches the subject of the certificate,
   the server is authenticated....

      SIPS borrows this pattern of server certificate matching from
      HTTPS.  However, RFC 2818 [7] prefers that the identity be
      conveyed as a subjectAltName extension of type dNSName rather than
      the common practice of conveying the identity in the CN field of
      the Subject field.  Similarly, this document recommends that the
      SIP domain identity be conveyed as a subjectAltName extension of
      type uniformResourceIdentifier (c.f.  Section 6, Section 7.1).

> If so, does "telnet://example.com/" match "https://example.com/"? I
> guess not as the URI schemes are different. The exact matching rules
> for URIs are not defined in the I-D though.

The basic idea is that the client would expect to connect to a SIP
service at "example.com" (the reference identity). Therefore it would
expect to find one of the following:

1. A dNSName of "example.com"

2. An SRVName of _sip.example.com"

3. A uniformResourceIdentifier of "sip:example.com" or
"sips:example.com" (not "https://example.com" or any other scheme).

You're right that this needs to be specified more clearly in the spec.
I'll fix that in the next version.

> The I-D allows multiple different types in subjAltnames so I guess
> it's legal to have subjAltnames of type dNSName and
> uniformResourceIdentifier in the same certificate.=20

Yes.

> So a subjAltname
> 'URI:telnet://example.com/, DNS:example.com' would be valid. Assume
> the user wants to connect to a server with that subjAltname=20

The user doesn't want to connect to a particular SAN, the user wants to
connect to a service of type X at domain Y (e.g., "the SIP service at
example.com").

> and
> enters 'https://example.com/' in the browser. Should that succeed?

Yes, because any match is fine. But see below.

> Again I guess the URI doesn't match.=20

IMHO, users don't care much about the particular service type (at least
not in current practice). They want to connect to example.com, but they
are not too particular about the specific service type ("oh no, I really
want to connect to a SIP service but this URI says the service is a web
site instead"). Whether we want to train users to be more cautious about
the service type (or place additional rules upon user agent software) is
another matter.

> However, when mapping the URI
> to the host part only the dNSName would match and the connection
> succeeds. Also, clients that don't support URIs in subjAltnames (as
> almost all software out there) would ignore the URI and match
> dNSName only.

Correct. And I think that's fine, because as noted users care more about
the domain match than the service type match.

> So, without defining further constraints an URI in subjAltnames is
> rather useless, isn't it?

No, because we're trying to be inclusive regarding SANs at this point,
and SIP certificates (as one example) prefer uniformResourceIdentifier.

However, I will work to clean this up some more in -04.

Peter

--=20
Peter Saint-Andre
https://stpeter.im/




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--------------ms090406020005060600010603--

From stpeter@stpeter.im  Wed Mar 31 15:14:36 2010
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Subject: Re: [certid] additional security consideration
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On 3/18/10 1:54 PM, Michael Str=C3=B6der wrote:
> Joe Orton wrote:
>> On Thu, Mar 18, 2010 at 07:07:31AM +0300, ArkanoiD wrote:
>>> Second level domain MUST NOT be wildcarded, thus *.com is invalid and=
 should
>>> never match. (as well as "*", of course)
>>
>> I don't think it's appropriate for the draft to specify any requiremen=
t=20
>> beyond the "left-most label" rule, so far as wildcards go.  I could=20
>> imagine a "*.local" or similar could be useful to allow, and *.com is =

>> really little more dangerous than *.co.uk.
>=20
> Good point with *.co.uk but I'd draw the opposite conclusion from it:
> I'd rather like to see wildcards forbidden completely or at least stron=
gly
> discouraged.

I would, too. There are significant security concerns with them (related
to phishing attacks and such).

However, some CAs will issue wildcard certs to certificate holders who
are more highly verified (e.g., Class 2 certificates requiring identity
verification of some kind). So I think this is an open issue.

Peter

--=20
Peter Saint-Andre
https://stpeter.im/




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--------------ms040004040003010805050205--

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>> So, without defining further constraints an URI in subjAltnames is
>> rather useless, isn't it?
>=20
> No, because we're trying to be inclusive regarding SANs at this point,
> and SIP certificates (as one example) prefer =
uniformResourceIdentifier.
>=20
> However, I will work to clean this up some more in -04.

Somewhat paraphrasing a question that I think was asked at the app area =
open meeting last week, is it the intention to encourage new =
protocols/services that adopt/reference this proposal to favor matching =
based on URIs where possible or appropriate?

That's something I'm in favor of, and I think worrying about what users =
think they're connecting to is really beside the point; users don't get =
this stuff. Our software is supposed to do the right things for them so =
that they don't have to.

-- Scott


