Restrict authoritative queries to internal networks

Mirrors the puppet authoritative master-zones view (match-clients
acl-main.unkin.net) using a global allow-query instead of a view, since
dynamic primary zones in a view would need per-view allow-new-zones.

- add auth-acl-main BindACL (the puppet acl-main.unkin.net networks)
- allow-query { auth-acl-main; 10.42.0.0/16; } on bind-authoritative
  (pod net included so secondaries can SOA-refresh from the primary)

apps/base/bind-internal/authoritative/acls.yaml

@@ -0,0 +1,26 @@
+---
+# Internal client networks allowed to query the authoritative servers,
+# mirrored from the puppet authoritative /etc/named/acls.conf
+# (acl-main.unkin.net). Named auth-acl-main because the resolver has its own,
+# differently-scoped acl-main.unkin.net in the same namespace.
+apiVersion: bind.unkin.net/v1alpha1
+kind: BindACL
+metadata:
+  name: auth-acl-main
+  namespace: bind-internal
+spec:
+  clusterRef: bind-authoritative
+  entries:
+    - 198.18.13.0/24
+    - 198.18.14.0/24
+    - 198.18.15.0/24
+    - 198.18.16.0/24
+    - 198.18.17.0/24
+    - 198.18.19.0/24
+    - 198.18.20.0/24
+    - 198.18.24.0/24
+    - 198.18.25.0/24
+    - 198.18.26.0/24
+    - 198.18.27.0/24
+    - 198.18.28.0/24
+    - 198.18.29.0/24

apps/base/bind-internal/authoritative/cluster.yaml

@@ -11,6 +11,11 @@ spec:
   replicas: 3
   storageClassName: cephrbd-fast-delete
   storageSize: 2Gi
+  # Restrict queries to internal networks (puppet acl-main.unkin.net).
+  # 10.42.0.0/16 (pod net) is required so secondaries can SOA-refresh
+  # from the primary during catalog replication.
+  extraOptions:
+    - "allow-query { auth-acl-main; 10.42.0.0/16; }"
   service:
     type: LoadBalancer
     annotations:

apps/base/bind-internal/authoritative/kustomization.yaml

@@ -6,3 +6,4 @@ resources:
   - cluster.yaml
   - tsigkey.yaml
   - zones.yaml
+  - acls.yaml