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From: Tim Bruijnzeels <tim@ripe.net>
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Subject: Re: [Sidrops] I-D Action: draft-ietf-sidrops-signed-tal-00.txt
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Hi Tom,

Thank you for your reply. I have been side-tracked for a bit, but let me =
comment :)

> On 16 Nov 2017, at 11:34, Tom Harrison <tomh@apnic.net> wrote:
>=20
> On Mon, Nov 13, 2017 at 11:20:18PM -0800, internet-drafts@ietf.org =
wrote:
>> A New Internet-Draft is available from the on-line Internet-Drafts
>> directories.
>> This draft is a work item of the SIDR Operations WG of the IETF.
>>=20
>>      Title           : RPKI signed object for TAL
>>      Authors         : Tim Bruijnzeels
>>                        Carlos Martinez
>> 	Filename        : draft-ietf-sidrops-signed-tal-00.txt
>> 	Pages           : 10
>> 	Date            : 2017-11-13
>=20
> We've done a fairly basic proof-of-concept implementation of this as
> an extension to our RPKI system.  The core of it looks good and
> functions as expected.  Some questions and minor suggestions (all
> IMHO):
>=20
> Having explicit structure in the SignedTalContent definition would
> make implementation a little easier.  It would also remove any
> possible confusion about whether the public key need be base64-encoded
> again (the current text appears to require that).

I agree that the double encoding is probably not needed. I hoped to =
avoid any chance of having character in the =E2=80=98eContent=E2=80=99 =
part that could cause issue. But.. just shooting for encoding again for =
good measure was a bit of lazy thinking here.. we don=E2=80=99t need =
this for the XML messages in RFC6492 (provisioning) and RFC8181 =
(publication) either, so I think we should be safe.

There is no structure at the moment because we wanted to use the TAL =
format as-is.

That said, I think that there may be merit in an explicit json, or XML =
(to be consistent with 6492 and 8181) format, e.g.:

<tal>
   <uris>
     <uri>https://rpki.example.org/rpki/hedgehog/root.cer</uri>
     <uri>rsync://rpki.example.org/rpki/hedgehog/root.cer</uri>
   </uris>
   <subjectPublicKeyInfo>
      MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAovWQL2lh6knDx
      GUG5hbtCXvvh4AOzjhDkSHlj22gn/1oiM9IeDATIwP44vhQ6L/xvuk7W6
      Kfa5ygmqQ+xOZOwTWPcrUbqaQyPNxokuivzyvqVZVDecOEqs78q58mSp9
      nbtxmLRW7B67SJCBSzfa5XpVyXYEgYAjkk3fpmefU+AcxtxvvHB5OVPIa
      BfPcs80ICMgHQX+fphvute9XLxjfJKJWkhZqZ0v7pZm2uhkcPx1PMGcrG
      ee0WSDC3fr3erLueagpiLsFjwwpX6F+Ms8vqz45H+DKmYKvPSstZjCCq9
      aJ0qANT9OtnfSDOS+aLRPjZryCNyvvBHxZXqj5YCGKtwIDAQAB
   </subjectPublicKeyInfo>
</tal>

A structure like this will make it easier to add tags or attributes to =
communicate other things. See below.

> Section 3.3 has "[i]f the above procedure indicates that the manifest
> is invalid".  It looks like it should be "...that the Signed TAL is
> invalid".
>=20
> Section 4 has "[t]his EE certificate MUST have a "notBefore" time that
> is before the moment that the Signed TAL will be published".  Why is
> this a MUST?  I can imagine somebody prepublishing the new TAL, but
> not wanting RPs to switch over until the notBefore time had been
> reached, though I guess that would also lead to validation errors for
> RPs in the interim due to the object not being in-date.

It=E2=80=99s a MUST because otherwise the object is invalid.

If we need an explicit staging time, rather than require this implicitly =
by publishing it, then I think we are better off with a valid object and =
an XML structure like above with an additional tag like:

<notBefore>2019-01-01T00:00:00.000Z</notBefore>

> Regarding signed TAL EE certificate validity periods generally, I
> think it would be good to add some text about how the new TAL becomes
> 'effective' as soon as it is published, and that neither revocation
> nor expiry of the associated EE certificate has any implications in
> that respect (even though this is implicit from the document as a
> whole).

True. Whether it=E2=80=99s done implicitly by publishing the signed TAL =
(as the document says now), or some explicit <notBefore/> tag is =
introduced: there is a point of no return by which RPs will have moved =
over.

And thinking about this a bit more I believe that there should also be =
text that forbids a Trust Anchor from pointing RPs back to a previous =
key. We should only roll forward.

> Section 6.3 has "[t]he TA SHOULD preserve a Signed TAL for the old key
> after the staging period as a hint for RPs that missed the key roll".
> Although (I think) the only sensible way to read this is that the
> signed TAL to which this is referring is that pointing to the new TA,
> "for the old key" might make people think the signed TAL should be for
> the deprecated key instead.  Something like "[t]he TA SHOULD preserve
> the Signed TAL pointing to the new TA after the staging period..."
> could work.

So, here there is a lot of implicit stuff again.

We could also think of this differently.. maybe extending the structure =
to something like this could help:

<ta>
  <oldKeys>
     <subjectPublicKeyInfo>MIIBIjANBgk=E2=80=A6</subjectPublicKeyInfo>
     <subjectPublicKeyInfo>MIIBIjdfkhjfd=E2=80=A6</subjectPublicKeyInfo>
  </oldKeys>
  <current>
  <tal>
   <uris>
     <uri>https://rpki.example.org/rpki/hedgehog/root.cer</uri>
     <uri>rsync://rpki.example.org/rpki/hedgehog/root.cer</uri>
   </uris>
   <subjectPublicKeyInfo>
      MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAovWQL2lh6knDx
      GUG5hbtCXvvh4AOzjhDkSHlj22gn/1oiM9IeDATIwP44vhQ6L/xvuk7W6
      Kfa5ygmqQ+xOZOwTWPcrUbqaQyPNxokuivzyvqVZVDecOEqs78q58mSp9
      nbtxmLRW7B67SJCBSzfa5XpVyXYEgYAjkk3fpmefU+AcxtxvvHB5OVPIa
      BfPcs80ICMgHQX+fphvute9XLxjfJKJWkhZqZ0v7pZm2uhkcPx1PMGcrG
      ee0WSDC3fr3erLueagpiLsFjwwpX6F+Ms8vqz45H+DKmYKvPSstZjCCq9
      aJ0qANT9OtnfSDOS+aLRPjZryCNyvvBHxZXqj5YCGKtwIDAQAB
   </subjectPublicKeyInfo>
</tal>
  </current>
</ta>

This way we can communicate explicitly which previous keys have been =
expired. And what the current key is at the time of publishing this.

If this is published by old keys in the form of long-lived objects and =
CRLs, then RPs could still find their way to the current key. An =
argument can also be made that RPs should not care about staleness of =
MFT/CRL or expired MFT/TAL EE certificates in this case.

> I think 24 hours for the staging period is too short, mainly because
> people who don't update their validators to support this may not take
> action on the new validation error (something like "unknown type of
> object: {name}.tal") within that short a time period.

Okay, it=E2=80=99s not clear to me that this is related to the staging =
period.

But, before any of this could be deployed we do need to be sure that RP =
software can be upgraded to support it, or at least not choke on it. If =
people do not upgrade their RP software they can still find out that a =
new TAL should be used through other means (e.g. mailing lists). And let =
me be devil=E2=80=99s advocate here.. if people never, ever upgrade =
their RP software, then breaking it and forcing them to upgrade could be =
considered a feature by some. Of course, after a reasonable time..

> There are also
> other instances like this where manual action might be required, e.g.
> where operations staff insist that the validator not have write access
> to its configuration and that all updates happen manually.  A week or
> a month as a mandatory period would be better.

I believe that we should insist that key rolls like this are fully =
automated and not done manually. I also believe that it would be prudent =
that if && when we agree on a mechanism for this, it is done regularly - =
at least in some environments to ensure that this works. In short: I =
think a planned key roll, signed by a trusted TA, should be a normal =
thing. If we leave this as paperware then there will be no guarantee =
that it works when we need it.


One more thing I wanted to bring up is unplanned key rolls. There may be =
merit in having a <staging> tag in the structure, like this:

<ta>
  <oldKeys>
     <subjectPublicKeyInfo>MIIBIjANBgk=E2=80=A6</subjectPublicKeyInfo>
     <subjectPublicKeyInfo>MIIBIjdfkhjfd=E2=80=A6</subjectPublicKeyInfo>
  </oldKeys>
  <current>=E2=80=A6 this key.. </current>

  <staging>
  <type>standby</type>
  <tal>
   <uris>
     <uri>https://rpki.example.org/rpki/hedgehog/root.cer</uri>
     <uri>rsync://rpki.example.org/rpki/hedgehog/root.cer</uri>
   </uris>
   <subjectPublicKeyInfo>
      MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAovWQL2lh6knDx
      GUG5hbtCXvvh4AOzjhDkSHlj22gn/1oiM9IeDATIwP44vhQ6L/xvuk7W6
      Kfa5ygmqQ+xOZOwTWPcrUbqaQyPNxokuivzyvqVZVDecOEqs78q58mSp9
      nbtxmLRW7B67SJCBSzfa5XpVyXYEgYAjkk3fpmefU+AcxtxvvHB5OVPIa
      BfPcs80ICMgHQX+fphvute9XLxjfJKJWkhZqZ0v7pZm2uhkcPx1PMGcrG
      ee0WSDC3fr3erLueagpiLsFjwwpX6F+Ms8vqz45H+DKmYKvPSstZjCCq9
      aJ0qANT9OtnfSDOS+aLRPjZryCNyvvBHxZXqj5YCGKtwIDAQAB
   </subjectPublicKeyInfo>
  </tal>
  </staging>

</ta>

This could alert RPs that a new key exists. It in turn can publish the =
same signed TAL structure - confirming that this staging key is not in =
use yet. If and when the old key needs to be replaced and the TA =
operator lost access to its key, then the staging key can publish a =
structure where the old key appears in the <oldKeys> list instead.. in =
other words it=E2=80=99s empowered to revoke the =E2=80=9Ccurrent=E2=80=9D=
 key. If access to the =E2=80=9Cstaging" key is lost, then the =
=E2=80=9Ccurrent=E2=80=9D key can just remove the <staging> section, or =
replace it with another staging key.

The risk here is that if the new key goes rogue it can revoke the =
current key. I don=E2=80=99t think that this is a bigger risk than the =
current key going rogue. The advantage is that there is a back-up key =
and in a TA can recover if they lose access to either the current, or =
the staging key. If Hardware Security Modules (HSMs) are used, the risk =
of key theft can be mitigated to a very large degree - typically keys =
are protected by an N out of M card set where a quorum of people are =
needed to use the key, or migrate it into new hardware. But, losing =
keys, broken cards, and sadly loosing people, are real threats that can =
lead to situations where a TA no longer has a quorum.

Obviously the above is not worked out in full detail, but I would =
welcome discussion on the direction. And as a final thought.. it would =
be good if the planned and unplanned key roll processes are similar.


Thanks

Tim


>=20
> -Tom
>=20
> _______________________________________________
> Sidrops mailing list
> Sidrops@ietf.org
> https://www.ietf.org/mailman/listinfo/sidrops
>=20


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From: "Roque Gagliano (rogaglia)" <rogaglia@cisco.com>
To: Tim Bruijnzeels <tim@ripe.net>
CC: "sidrops@ietf.org" <sidrops@ietf.org>
Thread-Topic: [Sidrops] Document on HTTPS on TALs (update to RFC7730) - seeking adoption
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From: Tim Bruijnzeels <tim@ripe.net>
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To: "Roque Gagliano (rogaglia)" <rogaglia@cisco.com>
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Subject: Re: [Sidrops] Document on HTTPS on TALs (update to RFC7730) - seeking adoption
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Hi Roque, WG,

As I said I believe that you=E2=80=99re right and it should say =
=E2=80=9Cobsoletes=E2=80=9D.

Co-chairs, can you initiate a call for adoption on this?

I am happy to change =E2=80=9Cupdates=E2=80=9D to =E2=80=9Cobsoletes=E2=80=
=9D when adopted.

Tim




> On 6 Dec 2017, at 21:11, Roque Gagliano (rogaglia) =
<rogaglia@cisco.com> wrote:
>=20
> Hi Tim,
>=20
> IMHO, If it replaces rather than complements, it should be obsoletes.
>=20
> I guess there is a formal definition somewhere.
>=20
> Roque
>=20
>=20
>=20
>=20
> Sent from my Samsung Galaxy smartphone.
>=20
> -------- Original message --------
> From: Tim Bruijnzeels <tim@ripe.net>
> Date: 11/30/17 14:39 (GMT+01:00)
> To: "Roque Gagliano (rogaglia)" <rogaglia@cisco.com>
> Cc: sidrops@ietf.org
> Subject: Re: [Sidrops] Document on HTTPS on TALs (update to RFC7730) - =
seeking adoption
>=20
>=20
> > On 30 Nov 2017, at 14:31, Roque Gagliano (rogaglia) =
<rogaglia@cisco.com> wrote:
> >=20
> > Hi Tim,
> >=20
> > Not sure I understand why you are =E2=80=9Cupdates=E2=80=9D RFC 7730 =
and not =E2=80=9Cobsoletes=E2=80=9D RFC7730. Could you please elaborate =
on this decision?
>=20
> I believe you=E2=80=99re right and it should indeed say =
=E2=80=98obsoletes=E2=80=99 - as in replaces - rather than updates =
(parts) of it. That said, most of the text is a straight copy of the =
text in 7730.
>=20
> Tim
>=20
>=20
> >=20
> > Regards,
> > Roque
> >=20
> >=20
> > On 30/11/17 14:02, "Sidrops on behalf of Tim Bruijnzeels" =
<sidrops-bounces@ietf.org on behalf of tim@ripe.net> wrote:
> >=20
> >    Dear working group,
> >=20
> >    As discussed at IETF99, and in informal talks with some of you, =
we would like to update the TAL format (RFC7730) to allow HTTPS.
> >=20
> >    I worked with George Michaelson on an update. Because RFC7730 =
contains quite a few references to =E2=80=98rsync=E2=80=99 we felt that =
a new document updating 7730 would be more readable and appropriate then =
document updating many small bits of text. The -00 version of this =
document is here: =
https://tools.ietf.org/id/draft-tbruijnzeels-sidrops-https-tal-00.txt
> >=20
> >    We would like to ask the co-chairs to make a call to the working =
group for adoption.
> >=20
> >    In short this update will allow the use of HTTPS instead of, or =
in addition to, rsync on TALs. Other than that it contains a section on =
TLS verification similar to the one that is included in the delta =
protocol (RFC8182) - essentially saying that TLS verification is done on =
a best effort basis - and warnings should be uttered in case of issues - =
but because the TA certificate can still be validated cryptographically =
it MUST still be downloaded. Note that it is a matter of local policy =
whether an RP chooses to use different locations if they are present, =
but we may want to add some text here recommending the use of HTTPS URIs =
that have no TLS verification issues over ones that do - at this point I =
am not sure that this is needed, or would need to be normative text, but =
I think it would be good to have some discussion on this.
> >=20
> >    For the record, I am not sure what is customary in these cases of =
relatively small updates to existing standards. But, I tried to approach =
the other authors of RFC7730 (George is already one of them) and ask =
them whether they want to remain authors on this new document. Geoff =
Huston indicated that he does not need to be on the list, but has no =
objections to us doing this work. I have not seen responses from Sam =
Weiler or Stephen Kent - it is also possible that they missed my =
message. In any case we have no objections if they do wish to stay on as =
authors, but for now they are not on the list of the document linked =
above.
> >=20
> >    Kind regards,
> >=20
> >    Tim=20
> >=20
> >=20
> >=20
> >=20
> >    _______________________________________________
> >    Sidrops mailing list
> >    Sidrops@ietf.org
> >    https://www.ietf.org/mailman/listinfo/sidrops
> >=20
> >=20
> > _______________________________________________
> > Sidrops mailing list
> > Sidrops@ietf.org
> > https://www.ietf.org/mailman/listinfo/sidrops
>=20
> _______________________________________________
> Sidrops mailing list
> Sidrops@ietf.org
> https://www.ietf.org/mailman/listinfo/sidrops


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From: "Roque Gagliano (rogaglia)" <rogaglia@cisco.com>
To: Tim Bruijnzeels <tim@ripe.net>
CC: "sidrops@ietf.org" <sidrops@ietf.org>
Thread-Topic: [Sidrops] Document on HTTPS on TALs (update to RFC7730) - seeking adoption
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From nobody Mon Dec 11 18:05:33 2017
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Subject: [Sidrops] I-D Action: draft-ietf-sidrops-bgpsec-rollover-04.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 SIDR Operations WG of the IETF.

        Title           : BGPsec Router Certificate Rollover
        Authors         : Brian Weis
                          Roque Gagliano
                          Keyur Patel
	Filename        : draft-ietf-sidrops-bgpsec-rollover-04.txt
	Pages           : 11
	Date            : 2017-12-11

Abstract:
   Certification Authorities (CAs) within the Resource Public Key
   Infrastructure (RPKI) manage BGPsec router certificates as well as
   RPKI certificates.  The rollover of BGPsec router certificates must
   be carefully performed in order to synchronize the distribution of
   router public keys with BGPsec Update messages verified with those
   router public keys.  This document describes a safe rollover process,
   as well as discussing when and why the rollover of BGPsec router
   certificates are necessary.  When this rollover process is followed
   the rollover will be performed without routing information being
   lost.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-sidrops-bgpsec-rollover/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-sidrops-bgpsec-rollover-04
https://datatracker.ietf.org/doc/html/draft-ietf-sidrops-bgpsec-rollover-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-sidrops-bgpsec-rollover-04


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

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


From nobody Mon Dec 11 18:09:30 2017
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Subject: [Sidrops] Protocol Action: 'BGPsec Router Certificate Rollover' to Best Current Practice (draft-ietf-sidrops-bgpsec-rollover-03.txt)
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The IESG has approved the following document:
- 'BGPsec Router Certificate Rollover'
  (draft-ietf-sidrops-bgpsec-rollover-03.txt) as Best Current Practice

This document is the product of the SIDR Operations Working Group.

The IESG contact persons are Warren Kumari and Benoit Claise.

A URL of this Internet Draft is:
https://datatracker.ietf.org/doc/draft-ietf-sidrops-bgpsec-rollover/





Technical Summary

    Certificate Authorities (CAs) managing CA certificates and End-Entity
   (EE) certificates within the Resource Public Key Infrastructure
   (RPKI) will also manage BGPsec router certificates.  But the rollover
   of CA and EE certificates BGPsec router certificates have additional
   considerations for Normal and emergency rollover processes.  The
   rollover must be carefully managed in order to synchronize
   distribution of router public keys and BGPsec routers creating BGPsec
   Update messages verified with those router public keys.  This
   document provides general recommendations for the rollover process,
   as well as describing reasons why the rollover of BGPsec router
   certificates might be necessary.  When this rollover process is
   followed the rollover should be accomplished without routing
   information being lost.

Working Group Summary

   As the Document Shepherd says: 
  "This document didn't raise the ire of the WG, which was nice for a change."
  The document was well reviewed. 

Document Quality

   There are existing implementations - the 3 main versions of RPKI supporting software implement this.

Personnel

   Document Shepherd: Chris Morrow.
   Responsible Area Director: Warren Kumari

