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  • Exam Name: Certified Kubernetes Security Specialist (CKS)
  • Last Update: 28-Nov-2022
  • Questions and Answers: 44
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CKS Questions and Answers

Question # 1

On the Cluster worker node, enforce the prepared AppArmor profile

  • #include
  •  
  •  
  • profile docker-nginx flags=(attach_disconnected,mediate_deleted) {
  • #include
  •  
  • network inet tcp,
  • network inet udp,
  • network inet icmp,
  •  
  • deny network raw,
  •  
  • deny network packet,
  •  
  • file,
  • umount,
  •  
  • deny /bin/** wl,
  • deny /boot/** wl,
  • deny /dev/** wl,
  • deny /etc/** wl,
  • deny /home/** wl,
  • deny /lib/** wl,
  • deny /lib64/** wl,
  • deny /media/** wl,
  • deny /mnt/** wl,
  • deny /opt/** wl,
  • deny /proc/** wl,
  • deny /root/** wl,
  • deny /sbin/** wl,
  • deny /srv/** wl,
  • deny /tmp/** wl,
  • deny /sys/** wl,
  • deny /usr/** wl,
  •  
  • audit /** w,
  •  
  • /var/run/nginx.pid w,
  •  
  • /usr/sbin/nginx ix,
  •  
  • deny /bin/dash mrwklx,
  • deny /bin/sh mrwklx,
  • deny /usr/bin/top mrwklx,
  •  
  •  
  • capability chown,
  • capability dac_override,
  • capability setuid,
  • capability setgid,
  • capability net_bind_service,
  •  
  • deny @{PROC}/* w, # deny write for all files directly in /proc (not in a subdir)
  • # deny write to files not in /proc//** or /proc/sys/**
  • deny@{PROC}/{[^1-9],[^1-9][^0-9],[^1-9s][^0-9y][^0-9s],[^1-9][^0-9][^0-9][^0-9]*}/** w,
  • deny @{PROC}/sys/[^k]** w, # deny /proc/sys except /proc/sys/k* (effectively /proc/sys/kernel)
  • deny @{PROC}/sys/kernel/{?,??,[^s][^h][^m]**} w, # deny everything except shm* in /proc/sys/kernel/
  • deny @{PROC}/sysrq-trigger rwklx,
  • deny @{PROC}/mem rwklx,
  • deny @{PROC}/kmem rwklx,
  • deny @{PROC}/kcore rwklx,
  •  
  • deny mount,
  •  
  • deny /sys/[^f]*/** wklx,
  • deny /sys/f[^s]*/** wklx,
  • deny /sys/fs/[^c]*/** wklx,
  • deny /sys/fs/c[^g]*/** wklx,
  • deny /sys/fs/cg[^r]*/** wklx,
  • deny /sys/firmware/** rwklx,
  • deny /sys/kernel/security/** rwklx,
  • }

Edit the prepared manifest file to include the AppArmor profile.

  • apiVersion: v1
  • kind: Pod
  • metadata:
  •   name:apparmor-pod
  • spec:
  •   containers:
  •   - name: apparmor-pod
  •     image: nginx

Finally, apply the manifests files and create the Pod specified on it.

Verify: Try to use command ping, top, sh

Question # 2

Use the kubesec docker images to scan the given YAML manifest, edit and apply the advised changes, and passed with a score of 4 points.

kubesec-test.yaml

  • apiVersion: v1
  • kind: Pod
  • metadata:
  • name: kubesec-demo
  • spec:
  • containers:
  • - name: kubesec-demo
  • image: gcr.io/google-samples/node-hello:1.0
  • securityContext:
  • readOnlyRootFilesystem:true

Hint: docker run -i kubesec/kubesec:512c5e0 scan /dev/stdin <kubesec-test.yaml

Question # 3

Create a PSP that will only allow thepersistentvolumeclaim as the volume type in the namespace restricted.

Create a new PodSecurityPolicy named prevent-volume-policy which prevents the pods which is having different volumes mount apart from persistentvolumeclaim.

Create a new ServiceAccount named psp-sa in the namespace restricted.

Create a new ClusterRole named psp-role, which uses the newly created Pod Security Policy prevent-volume-policy

Create a new ClusterRoleBinding named psp-role-binding, which binds the created ClusterRole psp-role tothe created SA psp-sa.

Hint:

Also, Check the Configuration is working or not by trying to Mount a Secret in the pod maifest, it should get failed.

POD Manifest:

  • apiVersion: v1
  • kind: Pod
  • metadata:
  • name:
  • spec:
  • containers:
  • - name:
  • image:
  • volumeMounts:
  • - name:
  • mountPath:
  • volumes:
  • - name:
  • secret:
  • secretName:

Question # 4

Secrets stored in the etcd is not secure at rest, you can use the etcdctl command utility to find the secret value

for e.g:-

ETCDCTL_API=3 etcdctl get /registry/secrets/default/cks-secret --cacert="ca.crt" --cert="server.crt" --key="server.key"

Output

CKS question answer

Using the Encryption Configuration, Create the manifest, which secures the resource secrets using the provider AES-CBC and identity, to encrypt the secret-data at rest and ensure all secrets are encrypted with the new configuration.

Question # 5

Enable audit logs in the cluster, To Do so, enable the log backend, and ensure that

1. logs are stored at /var/log/kubernetes-logs.txt.

2. Log files are retained for 12 days.

3. at maximum, a number of 8 old audit logs files are retained.

4. set the maximum size before getting rotated to 200MB

Edit and extend the basic policy to log:

1. namespaces changes at RequestResponse

2. Log the request body of secrets changes in thenamespace kube-system.

3. Log all other resources in core and extensions at the Request level.

4. Log "pods/portforward", "services/proxy" at Metadata level.

5. Omit the Stage RequestReceived

All other requests at the Metadata level

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