Question LE Cert | Synology DDNS Wildcard

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Question LE Cert | Synology DDNS Wildcard

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DS4l8play, DS202j, DS3623xs+, DSM 7.3.3-25847
It's been often said that the Synology doesn't support wildcard use. I see that limit in the LE Cert tool on my NAS.

Is this specific for the Synology LE Cert registration, alone, or also for the Synology DDNS domains?

For example, if I manage to get the LE Cert process working on Docker, can I register *.secretword.synology.me and expect it to work?
 
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For example, if I manage to get the LE Cert process working on Docker, can I register *.secretword.synology.me and expect it to work?
I am (still) using Traefik 1.7.x and its build in LE integration. The precondition for wildcard certificate creation is a supported registrar (as in the dns-api is supported by certbot/traefik). During the creation of a wildcard certificate a "txt" entry is added to your Domain and verified by the LE client.

I highly doubt that synology provides access to the dns-api, do they?

I have a couple of domains registered and my registrar is supported - works flawless with Traefik's LE integration.

Update: I forget to mention that Syno's LE integration does only support the HTTP-01 challenge, which does not allow to creat wildcard certifcates. You will either need Certbot or Traefik for this. If you are working with docker-compose, Traefik is a feasable option. Afaik the required labels are not maintainable from the ui. TBH, I just made a couple of tests with Traefik on the DS, but have no long term experience with it. My long term experience is only with dedicated Swarm clusters - Traefik works like a champ in this setup.
 
I highly doubt that synology provides access to the dns-api, do they?
No, they don't. Even so, with a wild card cert you will need to own the root domain as well (or have control over it) and none of us does, so registering a wild card sub domain on *.synology.me is not an option.

As King said, LE container, Traefik, are your docker alternatives for now, until DSM7 comes out.

In DSM7 there will be a native support for this as noted in the release notes for the Preview version:

Security
  • Added support for Let’s Encrypt wildcard certificates when using Synology DDNS service.
 

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