Symbiosis: Publish CAA (DNS TXT) records to improve security
Imported from https://www.github.com/BytemarkHosting/symbiosis/issues/134
Certification Authority Authorization (CAA), specified in RFC 6844 in 2013, is a proposal to improve the strength of the PKI ecosystem with a new control to restrict which CAs can issue certificates for a particular domain name. It prevents bad people obtaining certificates from rogue or sloppy certification authorities.
It's a simple DNS text record to say, for example:
example.org. CAA 128 issue "letsencrypt.org"
At minimum, we could publish this record for a domain that's protected by a LetsEncrypt certificate.
https://blog.qualys.com/ssllabs/2017/03/13/caa-mandated-by-cabrowser-forum
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