[Operators] SSL certificates / private CAs / CACert issue

Phil Pennock xmpp-operators+phil at spodhuis.org
Thu Mar 21 23:57:05 UTC 2013


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On 2013-03-21 at 07:45 -0700, Peter Saint-Andre wrote:
> https://datatracker.ietf.org/doc/draft-miller-xmpp-posh-prooftype/

"""                                        however, these technologies
   are not yet widely deployed and might not be deployed in the near
   future for domains outside the most common top-level domains (e.g.,
   ".COM", ".NET", ".EDU").
"""

Of 272 TLDs, 85 have DS records. [1]  ARPA is not germane, so that's
84/271.  So while DNSSEC is not universal, it's certainly misleading to
imply that it's rare outside of the traditional gTLDs.  Eyeballing the
list of TLDs with DNSSEC delegated through them [2] it looks to cover
most nations with a strong Internet presence; notable by their absence
are just IT, HU, CN and AU.  And, perhaps ironically, PRO.  ;)

Reading that draft, it's unclear to me where "im.example.com" comes
from; is that the JID domain, thus phil at im.example.com, and so there has
to be an HTTP server at the zone apex which can be configured with XMPP
policy content, or is that derived from phil at example.com, in which case
how is the im label determined?  What's the trust path to it?

I see the value in having an alternative to DNSSEC, and even having it
around for the longer term, to be proof against mandated alternate root
anchors and inline resigning, for those stuck in countries where that
can be mandated.  I'm trying to figure out what is being gained here:
something equivalent to DNS NAPTR but with PKIX validation of the
results?

After all, if I can have appropriate certs on a web-server, served up by
domain, I can have the same on an XMPP server.  The key seems to be to
rely upon SNI support in web-servers without having to make sure XMPP
servers can also do dynamic certificate selection, and also letting XMPP
hosting be delegated (thus the NAPTR aspect of things) -- am I correct
in my summarisation, or have I missed something?

Thanks,
- -Phil


[1] Transfer root zone from open root, capture in file "root-zone";
    perl -ne < root-zone 'BEGIN { $top={ NS=>{}, DS=>{} } };
    if (/^([A-Za-z]+)\.\s+\d+\s+IN\s+(NS|DS)\b/) { $top->{$2}{$1} = 1 };
    END { foreach my $k (sort keys %{$top->{NS}}) {
      $haveds = exists $top->{DS}{$k};
      print $k . "\t\t" . ($haveds ? "Secure" : "Insecure" ) . "\n";
    } }'

[2] tack on  | sed -n 's/Secure//p' | xargs
    Results:
    ac ag am arpa asia at be bg biz br bz ca cat cc ch cl co com cr cz
    de dk edu eu fi fo fr gi gl gov gr hn in info io jp kg kr la lb lc
    li lk lt lu lv me mil mm mn museum my na nc net nl nu nz org pl pm
    post pr pt pw re ru sc se sh si su sx tf th tm tt tw tz ua ug uk us
    wf yt

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