feat: automated secret rotation controller

- ExternalSecret syncs age key from Vault to pod - CRD defines rotation schedule for each secret - Controller watches CRD, rotates on schedule: * Call provider API (Authentik/Forgejo/MinIO) for new secret * Update k8s Secret * Update .enc.yaml via sops (uses age key from Vault) * Git commit and push - Vault is source of truth for age key (never on disk) - Examples: minio-oidc (90d), portfolio-agent (90d), forgejo-token (90d), minio-root (180d)
2026-09-03 23:37:24 -07:00
parent f9654986ad
commit 667bca0f44
4 changed files with 304 additions and 0 deletions
@@ -0,0 +1,92 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: secret-rotation-controller
+  namespace: secret-rotation
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: secret-rotation-controller
+  template:
+    metadata:
+      labels:
+        app: secret-rotation-controller
+    spec:
+      serviceAccountName: secret-rotation-controller
+      containers:
+      - name: controller
+        image: secret-rotation-controller:latest
+        imagePullPolicy: IfNotPresent
+        env:
+        # SOPS reads age key from this file
+        - name: SOPS_AGE_KEY_FILE
+          value: /etc/sops/age/private-key.txt
+        
+        # Vault auth (token in projected volume)
+        - name: VAULT_ADDR
+          value: http://vault.vault.svc.cluster.local:8200
+        - name: VAULT_TOKEN_FILE
+          value: /var/run/secrets/vault/token
+        
+        # Authentik
+        - name: AUTHENTIK_URL
+          value: http://authentik-server.iam.svc.cluster.local
+        - name: AUTHENTIK_BOOTSTRAP_TOKEN
+          valueFrom:
+            secretKeyRef:
+              name: authentik-bootstrap
+              key: token
+        
+        # Git
+        - name: GIT_REPO
+          value: https://forgejo.riotpiao.com/rock/homelab.git
+        - name: GIT_AUTHOR_EMAIL
+          value: [email protected]
+        - name: GIT_AUTHOR_NAME
+          value: Secret Rotation Controller
+        - name: FORGEJO_TOKEN
+          valueFrom:
+            secretKeyRef:
+              name: forgejo-registry-secret
+              key: REGISTRY_TOKEN
+        
+        volumeMounts:
+        # Age key from ExternalSecret (synced from Vault)
+        - name: age-key
+          mountPath: /etc/sops/age
+          readOnly: true
+        
+        # Vault auth token (projected)
+        - name: vault-token
+          mountPath: /var/run/secrets/vault
+          readOnly: true
+        
+        # Temp working dir
+        - name: tmp
+          mountPath: /tmp
+        
+        resources:
+          requests:
+            cpu: 100m
+            memory: 256Mi
+          limits:
+            cpu: 500m
+            memory: 512Mi
+      
+      volumes:
+      - name: age-key
+        secret:
+          secretName: sops-age-key
+          defaultMode: 0400
+      
+      - name: vault-token
+        projected:
+          sources:
+          - serviceAccountToken:
+              path: token
+              audience: vault
+              expirationSeconds: 3600
+      
+      - name: tmp
+        emptyDir: {}