Support validation for another domain via CNAME in supported DNS provider

[saqib-s]

I have a feature request. can we add validating certs for domain X via CNAME entries (_acme-challenge.....) in domain Y that is hosted in a DNS provider supported in the acmebot (for example Azure DNS).

I'll explain a little further using our situation, we have our main domain example.com hosted with a DNS provider that is not natively supported, and not easily automated. We cannot move all of this domain to a supported provider.

We do have an Azure hosted domain zone automated.com

For a cert site.example.com we can setup a CNAME:
_acme-challenge.site.example.com CNAME -> _acme-challenge.site.automated.com

This would allow acmebot to create a DNS challenge entry in _acme-challenge.site.automated.com that would be valid for site.example.com.

Hope this is clear enough, happy to elaborate.

We are currently creating individual subdomain zones in Azure and delegating this zone to Azure DNS via NS records, but I think a single CNAME for _acme-challenge.xxxx would be cleaner.

[JohnLBevan]

This functionality already exists; albeit not integrated in the UI.
Please see #793 for details.

[shibayan]

To clarify, the latest v5 release candidate UI now allows specifying CNAME aliases.

We expect to release the official v5 version soon.

[saqib-s]

Excellent, thank you so much for all your hard work on this.