Kubernetes Security | Pod Security Admission Framework

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Pod Security Admission (PSA) framework
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A pod trying to run as root user
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apiVersion: v1
kind: Pod
metadata:
creationTimestamp: null
labels:
run: app4
name: app4
namespace: default
spec:
containers:
- name: nginx
image: nginxinc/nginx-unprivileged
securityContext:
allowPrivilegeEscalation: true
runAsNonRoot: false
runAsUser: 0
dnsPolicy: ClusterFirst
restartPolicy: Always
status: {}

Another pod trying to gain host filesystem access
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apiVersion: v1
kind: Pod
metadata:
name: insecure-pod
spec:
containers:
- name: nginx
image: nginxinc/nginx-unprivileged
securityContext:
allowPrivilegeEscalation: true
runAsNonRoot: false
runAsUser: 0
volumeMounts:
- name: host-root
mountPath: /host/root
volumes:
- name: host-root
hostPath:
path: /

A pod is trying to gain container runtime access to run its own containers on host:
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apiVersion: v1
kind: Pod
metadata:
name: compromised-pod
spec:
containers:
- name: compromised-container
image: alpine
command: ["/bin/sh", "-c", "sleep 3600"] # Simulate a long-running process
securityContext:
allowPrivilegeEscalation: true
volumeMounts:
- name: docker-socket
volumes:
- name: docker-socket
hostPath:

A pod with all securityContext requirements:
==============================================================
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: null
labels:
run: app3
name: app3
namespace: dev
spec:
containers:
- name: nginx
image: nginxinc/nginx-unprivileged
securityContext:
runAsNonRoot: true
runAsUser: 102
allowPrivilegeEscalation: false
capabilities:
drop:
- ALL
seccompProfile:
type: RuntimeDefault # Use default seccomp profile
dnsPolicy: ClusterFirst
restartPolicy: Always
status: {}

Labels for baseline:
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Labels for restricted:
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How to apply a label on namespace:
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