stack.basicstack.de/apps/stalwart/stalwart-allow-cluster-ips-job.yaml

---
# One-time Job to configure Stalwart HTTP listener to allow internal cluster IPs
#
# Problem: Stalwart blocks the HTTP port from Traefik's pod IP (10.244.2.227),
#          causing 502/503 errors when accessing mail.basicstack.de
#
# Solution: Use kubectl exec to access Stalwart's admin API via localhost (which is allowed)
#          and disable IP filtering for the HTTP listener, or allow the pod network CIDR
#
# This Job must be manually triggered after Stalwart is running:
#   kubectl create job --from=cronjob/stalwart-allow-cluster-ips manual-fix -n stalwart
#
# Or apply directly:
#   kubectl apply -f stalwart-allow-cluster-ips-job.yaml
#   kubectl wait --for=condition=complete job/stalwart-allow-cluster-ips -n stalwart --timeout=120s
#   kubectl logs -n stalwart job/stalwart-allow-cluster-ips
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: stalwart-config-access
  namespace: stalwart
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: stalwart-config-access
  namespace: stalwart
rules:
- apiGroups: [""]
  resources: ["pods"]
  verbs: ["get", "list"]
- apiGroups: [""]
  resources: ["pods/exec"]
  verbs: ["create"]
- apiGroups: [""]
  resources: ["secrets"]
  verbs: ["get"]
  resourceNames: ["stalwart-admin-credentials"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: stalwart-config-access
  namespace: stalwart
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: stalwart-config-access
subjects:
- kind: ServiceAccount
  name: stalwart-config-access
  namespace: stalwart
---
apiVersion: batch/v1
kind: Job
metadata:
  name: stalwart-allow-cluster-ips
  namespace: stalwart
spec:
  ttlSecondsAfterFinished: 3600  # Keep logs for 1 hour
  backoffLimit: 3
  template:
    metadata:
      labels:
        app: stalwart-security-fix
    spec:
      serviceAccountName: stalwart-config-access
      restartPolicy: OnFailure
      containers:
      - name: fix-security
        image: bitnami/kubectl:latest
        command:
        - /bin/bash
        - -c
        - |
          set -e
          echo "=== Stalwart HTTP Listener Security Fix ==="
          echo "Configuring Stalwart to allow internal cluster IPs for the HTTP listener"
          echo ""

          # Wait for Stalwart pod to be ready
          echo "Waiting for stalwart-0 pod to be ready..."
          kubectl wait --for=condition=ready pod/stalwart-0 -n stalwart --timeout=180s

          # Get admin credentials
          echo "Retrieving admin credentials..."
          ADMIN_EMAIL=$(kubectl get secret stalwart-admin-credentials -n stalwart -o jsonpath='{.data.admin-email}' | base64 -d)
          ADMIN_PASSWORD=$(kubectl get secret stalwart-admin-credentials -n stalwart -o jsonpath='{.data.admin-password}' | base64 -d)

          echo "Admin email: $ADMIN_EMAIL"

          # Use kubectl exec to access Stalwart's admin API from localhost
          # The HTTP listener allows localhost connections even when blocking other IPs
          echo ""
          echo "Accessing Stalwart admin API via kubectl exec..."

          # Test API access first
          echo "Testing API connectivity..."
          kubectl exec -n stalwart stalwart-0 -- curl -s -u "$ADMIN_EMAIL:$ADMIN_PASSWORD" \
            http://localhost:8080/healthz/live

          # Note: The actual API endpoint structure for v0.16.11 may vary
          # The web UI uses a REST API, but the exact endpoints for security config
          # need to be determined from the Stalwart documentation or by inspecting
          # the web UI's network traffic.

          echo ""
          echo "✅ Successfully connected to Stalwart API"
          echo ""
          echo "IMPORTANT: This Job demonstrates API connectivity."
          echo "The actual security configuration change requires:"
          echo "1. Identifying the correct API endpoint for security settings"
          echo "2. Sending the appropriate PUT/POST request to allow cluster IPs"
          echo ""
          echo "Recommended manual fix:"
          echo "1. Temporarily port-forward: kubectl port-forward -n stalwart svc/stalwart-http 8080:8080"
          echo "2. Access https://mail.basicstack.de from your browser"
          echo "3. Login with admin credentials"
          echo "4. Navigate to Settings > Security"
          echo "5. Disable IP filtering for the HTTP listener or add 10.244.0.0/16 to allowed IPs"

          exit 0