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chore: update acme reference design with design by tom

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Bert-Jan Fikse 2025-10-02 11:53:07 +02:00
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infrastructure/acme.md
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@ -11,22 +11,26 @@ We agreed to use **ACME DNS-01 challenges** for issuing certificates for **both
- Restrict write access to the challenge zone to the ACME automation only.
## Reference Design
**Dedicated zone:**
`_acme.example.com`
**Dedicated zone:**
`_acme.digitalboard.ch`
**For a service FQDN:**
Target certificate: `app1.example.com`
**Dedicated zone for each managed school:**
`gymkirchenfeld._acme.digitalboard.ch`
**Publish in the primary zone:**
**For a service FQDN:**
Target certificate: `app1.gymkirchenfeld.ch`, `app2.kinet.ch`
**Publish in the primary zone:**
```dns
; Delegate the challenge to the dedicated zone
_acme-challenge.app1.example.com. CNAME app1._acme-challenge._acme.example.com.
```
_acme-challenge.app1.gymkirchenfeld.ch. IN CNAME
app1.gymkirchenfeld.ch.gymkirchenfeld._acme.digitalboard.ch.
**Publish in the dedicated zone (managed by the ACME client/automation):**
```dns
; ACME client writes the TXT token here
app1._acme-challenge._acme.example.com. TXT "ACME_VALIDATION_TOKEN"
_acme-challenge.app2.kinet.ch. IN CNAME
app2.kinet.ch.gymkirchenfeld._acme.digitalboard.ch.
_acme-challenge.app.example.com. IN CNAME
app.example.com.school-a._acme.digitalboard.ch.
```
> During validation, the CA will follow the CNAME from the primary zone to the dedicated zone and read the TXT record there.