seikaikyo/implementing-kubernetes-pod-security-standards

Implementing Kubernetes Pod Security Standards

Overview

Pod Security Standards (PSS) define three levels of security policies -- Privileged, Baseline, and Restricted -- enforced by the Pod Security Admission (PSA) controller built into Kubernetes 1.25+. PSA replaces the deprecated PodSecurityPolicy and provides namespace-level enforcement with three modes: enforce, audit, and warn.

When to Use

• When deploying or configuring implementing kubernetes pod security standards capabilities in your environment
• When establishing security controls aligned to compliance requirements
• When building or improving security architecture for this domain
• When conducting security assessments that require this implementation

Prerequisites

• Kubernetes cluster 1.25+ (PSA GA)
• kubectl configured with cluster-admin access
• Understanding of Linux capabilities and security contexts

Core Concepts

Three Security Profiles

| Profile | Purpose | Restrictions | |---------|---------|-------------| | Privileged | Unrestricted, system workloads | None | | Baseline | Prevents known escalations | No hostNetwork, hostPID, hostIPC, privileged containers, dangerous capabilities | | Restricted | Hardened best practices | Non-root, drop ALL caps, seccomp required, read-only rootfs recommended |

Three Enforcement Modes

| Mode | Behavior | |------|----------| | enforce | Rejects pods that violate the policy | | audit | Logs violations in audit log but allows pod | | warn | Returns warning to user but allows pod |

Workflow

Step 1: Label Namespaces for PSA

# Restricted namespace - production workloads
apiVersion: v1
kind: Namespace
metadata:
  name: production
  labels:
    pod-security.kubernetes.io/enforce: restricted
    pod-security.kubernetes.io/enforce-version: latest
    pod-security.kubernetes.io/audit: restricted
    pod-security.kubernetes.io/audit-version: latest
    pod-security.kubernetes.io/warn: restricted
    pod-security.kubernetes.io/warn-version: latest

# Baseline namespace - general workloads
apiVersion: v1
kind: Namespace
metadata:
  name: staging
  labels:
    pod-security.kubernetes.io/enforce: baseline
    pod-security.kubernetes.io/enforce-version: latest
    pod-security.kubernetes.io/audit: restricted
    pod-security.kubernetes.io/audit-version: latest
    pod-security.kubernetes.io/warn: restricted
    pod-security.kubernetes.io/warn-version: latest

# Privileged namespace - system components only
apiVersion: v1
kind: Namespace
metadata:
  name: kube-system
  labels:
    pod-security.kubernetes.io/enforce: privileged
    pod-security.kubernetes.io/enforce-version: latest

Step 2: Apply Labels to Existing Namespaces

# Apply restricted enforcement to production
kubectl label namespace production \
  pod-security.kubernetes.io/enforce=restricted \
  pod-security.kubernetes.io/audit=restricted \
  pod-security.kubernetes.io/warn=restricted \
  --overwrite

# Apply baseline to staging with restricted warnings
kubectl label namespace staging \
  pod-security.kubernetes.io/enforce=baseline \
  pod-security.kubernetes.io/audit=restricted \
  pod-security.kubernetes.io/warn=restricted \
  --overwrite

# Check labels on all namespaces
kubectl get namespaces -L pod-security.kubernetes.io/enforce

Step 3: Create Compliant Pod Specs

# Restricted-compliant deployment
apiVersion: apps/v1
kind: Deployment
metadata:
  name: secure-app
  namespace: production
spec:
  replicas: 3
  selector:
    matchLabels:
      app: secure-app
  template:
    metadata:
      labels:
        app: secure-app
    spec:
      automountServiceAccountToken: false
      securityContext:
        runAsNonRoot: true
        runAsUser: 65534
        runAsGroup: 65534
        fsGroup: 65534
        seccompProfile:
          type: RuntimeDefault
      containers:
        - name: app
          image: myregistry.com/myapp:v1.0.0@sha256:abc123
          ports:
            - containerPort: 8080
              protocol: TCP
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            capabilities:
              drop:
                - ALL
            runAsNonRoot: true
            runAsUser: 65534
          resources:
            requests:
              memory: "64Mi"
              cpu: "100m"
            limits:
              memory: "256Mi"
              cpu: "500m"
          volumeMounts:
            - name: tmp
              mountPath: /tmp
            - name: cache
              mountPath: /var/cache
      volumes:
        - name: tmp
          emptyDir:
            sizeLimit: 100Mi
        - name: cache
          emptyDir:
            sizeLimit: 50Mi

Step 4: Gradual Migration Strategy

# Phase 1: Audit mode - discover violations without blocking
kubectl label namespace my-namespace \
  pod-security.kubernetes.io/audit=restricted \
  pod-security.kubernetes.io/warn=restricted

# Check audit logs for violations
kubectl logs -n kube-system -l component=kube-apiserver | grep "pod-security"

# Phase 2: Enforce baseline, warn on restricted
kubectl label namespace my-namespace \
  pod-security.kubernetes.io/enforce=baseline \
  pod-security.kubernetes.io/warn=restricted \
  --overwrite

# Phase 3: Full restricted enforcement
kubectl label namespace my-namespace \
  pod-security.kubernetes.io/enforce=restricted \
  --overwrite

Step 5: Dry-Run Enforcement Testing

# Test what would happen with restricted enforcement
kubectl label --dry-run=server --overwrite namespace my-namespace \
  pod-security.kubernetes.io/enforce=restricted

# Example output:
# Warning: existing pods in namespace "my-namespace" violate the new
# PodSecurity enforce level "restricted:latest"
# Warning: nginx-xxx: allowPrivilegeEscalation != false,
#   unrestricted capabilities, runAsNonRoot != true, seccompProfile

Baseline Profile Restrictions

| Control | Restricted | Requirement | |---------|-----------|-------------| | HostProcess | Must not set | Pods cannot use Windows HostProcess | | Host Namespaces | Must not set | No hostNetwork, hostPID, hostIPC | | Privileged | Must not set | No privileged: true | | Capabilities | Baseline list only | Only NET_BIND_SERVICE, drop ALL for restricted | | HostPath Volumes | Must not use | No hostPath volume mounts | | Host Ports | Must not use | No hostPort in container spec | | AppArmor | Default/runtime | Cannot set to unconfined | | SELinux | Limited types | Only container_t, container_init_t, container_kvm_t | | /proc Mount Type | Default only | Must use Default proc mount | | Seccomp | RuntimeDefault or Localhost | Must specify seccomp profile (restricted) | | Sysctls | Safe set only | Limited to safe sysctls |

Validation Commands

# Verify namespace labels
kubectl get ns --show-labels | grep pod-security

# Test pod creation against policy
kubectl run test-pod --image=nginx --namespace=production --dry-run=server

# Check for violations in audit logs
kubectl get events --field-selector reason=FailedCreate -A

# Scan with Kubescape for PSS compliance
kubescape scan framework nsa --namespace production

References

• Pod Security Standards - Kubernetes
• Pod Security Admission - Kubernetes
• Migrate from PodSecurityPolicy
• Kubescape PSS Scanner