Implementing Kubernetes Pod Security Standards

---
name: implementing-kubernetes-pod-security-standards
description: Use when 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+. PS. Use when working with
  implementing kubernetes pod security standards.
domain: cybersecurity
subdomain: container-security
tags:
- containers
- kubernetes
- security
- pod-security
- PSA
version: '1.0'
author: oyi77
license: Apache-2.0
nist_csf:
- PR.PS-01
- PR.IR-01
- ID.AM-08
- DE.CM-01
category: cybersecurity
---

# 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
**Trigger phrases:**
- "implementing kubernetes pod security standards"
- "Pod Security Standards (PSS) define three levels of security policies -- Privile"


- 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

This section covers core concepts for implementing kubernetes pod security standards.

- Ensure all prerequisites are met before proceeding
- Follow the documented workflow steps in sequence
- Record results and any anomalies encountered during this phase
### 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

1. **Scope the task** — define objectives, boundaries, and success criteria
2. **Gather information** — collect all necessary data and context before proceeding
3. **Execute the core workflow** — follow the domain-specific steps methodically
4. **Validate results** — verify outputs against expected outcomes or baselines
5. **Document findings** — record results, anomalies, and recommendations
### Step 1: Label Namespaces for PSA

```yaml
# 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
```

```yaml
# 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
```

```yaml
# 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

```bash
# 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

```yaml
# 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

```bash
# 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

```bash
# 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

```bash
# 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
```

## When NOT to Use

- You need to test the implementation (use performing-* skills)
- Task is about configuring existing tools (use configuring-* skills)
- You need to analyze security events (use analyzing-* skills)
- Task is about building detection rules (use building-* skills)
- You don't have access to the target environment
- Task requires vendor-specific expertise (consult vendor docs)


## Red Flags

- Performing actions without explicit written authorization from the asset owner
- Testing against production systems without a defined scope and rules of engagement
- Modifying cloud IAM policies or security groups without approval
- Exposing cloud credentials or secrets in logs or reports
- Running scans that generate excessive API calls and trigger billing alerts

## Verification

- All steps executed successfully against a test environment before production use
- Output documented with screenshots or logs demonstrating expected behavior
- Cloud resource changes reverted or documented as intentional
- IAM policies reviewed for least-privilege compliance after testing
- No residual test resources left running (cost and security check)

## References

- [Pod Security Standards - Kubernetes](https://kubernetes.io/docs/concepts/security/pod-security-standards/)
- [Pod Security Admission - Kubernetes](https://kubernetes.io/docs/concepts/security/pod-security-admission/)
- [Migrate from PodSecurityPolicy](https://kubernetes.io/docs/tasks/configure-pod-container/migrate-from-psp/)
- [Kubescape PSS Scanner](https://github.com/kubescape/kubescape)

## Process

1. Analyze the task requirements
2. Apply domain expertise
3. Verify output quality

## Anti-Rationalization Table

| Rationalization | Reality |
|---|---|
| "We are too small to be targeted" | Automated attacks target everyone. Size does not matter. |
| "Security slows us down" | A breach slows you down 100x more. Build security in from the start. |
| "We will fix it after launch" | Vulnerabilities in production are exploited within hours. Fix before deploy. |