deploy: scope state access for Longhorn backups

.trivyignore.yaml

@@ -1,6 +0,0 @@
-misconfigurations:
-  - id: KSV-0041
-    paths:
-      - deploy/clusterrole.yaml
-    expired_at: 2026-05-22
-    statement: Soteria copies restic credentials into target namespaces for backup Jobs; replace with a narrower per-namespace secret distribution model.

deploy/NOTES.md

@@ -0,0 +1,16 @@
+# Default deployment permissions
+
+This deployment uses the Longhorn backend. It reads inventory across namespaces
+and updates only `soteria-policies` and `soteria-backup-usage` in its own namespace.
+The empty Secret declarations create those records on first deployment; they
+deliberately contain no data field, so application-written state is preserved.
+The optional `soteria-restic` credential is readable by exact name only.
+
+Changing the state or credential names also requires updating the Role. Do not
+restore cluster-wide Secret access to accommodate another deployment.
+
+The optional restic backend needs additional, explicitly approved Roles and
+RoleBindings in each backup/restore target namespace: Job creation and the
+credential-copy operations in `internal/k8s/jobs.go`. Those grants are not part
+of this Longhorn deployment. Review credential distribution before enabling
+restic; Kubernetes RBAC cannot restrict Secret creation by resource name.

deploy/clusterrole.yaml

@@ -8,9 +8,6 @@ rules:
   - apiGroups: [""]
     resources: ["persistentvolumeclaims", "persistentvolumes"]
     verbs: ["get", "list"]
-  - apiGroups: [""]
-    resources: ["secrets"]
-    verbs: ["get", "list", "create", "update", "delete"]
   - apiGroups: ["batch"]
     resources: ["jobs"]
-    verbs: ["get", "list", "create"]
+    verbs: ["get", "list"]

deploy/kustomization.yaml

@@ -7,5 +7,6 @@ resources:
   - serviceaccount.yaml
   - clusterrole.yaml
   - clusterrolebinding.yaml
+  - state-access.yaml
   - deployment.yaml
   - service.yaml

deploy/state-access.yaml

@@ -0,0 +1,39 @@
+# The default Longhorn mode writes only its own policy and usage records.
+apiVersion: v1
+kind: Secret
+metadata:
+  name: soteria-policies
+type: Opaque
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: soteria-backup-usage
+type: Opaque
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: soteria-state
+rules:
+  - apiGroups: [""]
+    resources: ["secrets"]
+    resourceNames: ["soteria-policies", "soteria-backup-usage"]
+    verbs: ["get", "update"]
+  - apiGroups: [""]
+    resources: ["secrets"]
+    resourceNames: ["soteria-restic"]
+    verbs: ["get"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: soteria-state
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: soteria-state
+subjects:
+  - kind: ServiceAccount
+    name: soteria
+    namespace: soteria