net-kingdom/sso-mfa/k8s

T02 — K8s Foundations

Phase 1 of NK-WP-0001: namespaces, NetworkPolicies, cert-manager, StorageClass.

SSO stack overview

The sso namespace hosts three components:

• KeyCape (kc.coulomb.social) — OIDC orchestration layer, stateless
• Authelia (auth.coulomb.social) — password authentication frontend
• LLDAP (lldap.coulomb.social) — lightweight LDAP directory (admin UI restricted)

The mfa namespace hosts:

• privacyIDEA (pink.coulomb.social) — MFA engine, called by KeyCape

Prerequisites

• K3s cluster running (ThreePhoenix HA or single-node dev)
• T01 Phase 0a complete (KeePassXC vault populated, ops bundle exported)
• kubectl configured with cluster access

Apply order

# 1. Install cert-manager (if not already on cluster)
helm repo add jetstack https://charts.jetstack.io
helm repo update
helm install cert-manager jetstack/cert-manager \
  --namespace cert-manager --create-namespace \
  --set crds.enabled=true

# Wait for cert-manager to be ready
kubectl rollout status deployment/cert-manager -n cert-manager

# 2. Create namespaces
kubectl apply -f namespaces/namespaces.yaml

# 3. Apply NetworkPolicies
kubectl apply -f network-policies/netpol-sso.yaml
kubectl apply -f network-policies/netpol-mfa.yaml
kubectl apply -f network-policies/netpol-databases.yaml

# 4. Create ClusterIssuers
#    Edit issuers.yaml first: replace ACME_EMAIL with your address
kubectl apply -f cert-manager/issuers.yaml

# 5. Verify cert-manager with test certificate
kubectl apply -f cert-manager/test-certificate.yaml
kubectl wait --for=condition=Ready certificate/selfsigned-test \
  -n cert-manager-test --timeout=60s
kubectl delete namespace cert-manager-test

# 6. Verify StorageClass
kubectl apply -f storage/verify-pvc.yaml
kubectl wait --for=condition=Ready pod/storage-test \
  -n storage-test --timeout=60s
kubectl logs -n storage-test storage-test
kubectl delete namespace storage-test

# 7. Run the full verification script
chmod +x verify-t02.sh
./verify-t02.sh

NetworkPolicy design

All three namespaces follow a default-deny-all posture. Only the minimal required paths are opened:

Source	Destination	Port	Purpose
Traefik (kube-system)	KeyCape (sso)	8080	OIDC endpoints — public
Traefik (kube-system)	Authelia (sso)	9091	Login portal — public
Traefik (kube-system)	LLDAP (sso)	17170	Admin web UI — IP-restricted
Traefik (kube-system)	privacyIDEA (mfa)	8080	MFA portal — public
KeyCape (sso)	Authelia (sso)	9091	OIDC token exchange
KeyCape (sso)	LLDAP (sso)	3890	User attribute lookup
KeyCape (sso)	privacyIDEA (mfa)	8080	MFA challenge + validation
Authelia (sso)	LLDAP (sso)	3890	Credential validation
privacyIDEA (mfa)	PostgreSQL (databases)	5432	DB
CNPG operator (cnpg-system)	PostgreSQL (databases)	5432/9187	Operator + metrics
All pods	kube-dns (kube-system)	53	DNS resolution
CNPG pods	K8s API	6443	Status updates

Verifying denied paths (manual)

After applying NetworkPolicies, confirm that illegal paths are blocked:

# Test: KeyCape → privacyIDEA (should be ALLOWED)
kubectl run test-allowed -n sso --rm -it --image=busybox --restart=Never \
  -- nc -zv privacyidea.mfa.svc.cluster.local 8080

# Test: Authelia → privacyIDEA (should be DENIED — only KeyCape calls privacyIDEA)
kubectl run test-denied -n sso --rm -it --image=busybox --restart=Never \
  -l app.kubernetes.io/name=authelia \
  -- nc -zv -w3 privacyidea.mfa.svc.cluster.local 8080

# Test: databases → sso (should be DENIED — DB pods must not initiate connections)
kubectl run test-denied2 -n databases --rm -it --image=busybox --restart=Never \
  -- nc -zw3 keycape.sso.svc.cluster.local 8080

Notes

• net-kingdom/component labels on namespaces are used by NetworkPolicy namespaceSelector rules. Do not remove them.
• cnpg.io/cluster: net-kingdom-pg in netpol-databases.yaml must match the name of the CloudNativePG Cluster CR you create in T03.
• The letsencrypt-prod ClusterIssuer requires public DNS and port 80 open to Let's Encrypt servers. Update ACME_EMAIL before applying.