[Operators] No, not the hostname in CN. - Re: IM Observatory @ xmpp.net

Dave Cridland dave at cridland.net
Mon Nov 4 13:47:21 UTC 2013

On Mon, Nov 4, 2013 at 1:09 PM, Kim Alvefur <zash at zash.se> wrote:

> On 2013-11-04 03:01, Peter Kieser wrote:
> > Shouldn't the SSL certificate CN match the hostname listed in the "IN
> > SRV" record, since that's the hostname a S2S connection will open to.
> No!  The domain should match a subjectAltName.  Ignore hostnames, ignore
> commonNames.
> Exceptions are either fallbacks that you should not strive for, or DNA /
> DNSSEC / DANE related things that are not widely implemented or deployed.
> See also:
> https://plus.google.com/+DaveCridland/posts/fAdAUa62rse
> http://prosody.im/doc/certificates#which_domain

Loosely, only check a trustworthy certificate for a trustworthy identity.

So if a certificate is not trustworthy, then ignore any assertions of

And the only identity you can consider trustworthy is the one you're
starting out with; or one you can securely traverse to - this latter being
the realms of DANE and POSH and so on.

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