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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Minimize Microservice Vulnerabilities | 20% | - Configure network policies for namespace isolation - Use AppArmor or seccomp profiles to constrain container behavior - Use OPA Gatekeeper to enforce security controls - Set appropriate security contexts for pods and containers - Use PSP to enforce security controls - Understand the principle of immutable containers |
| Topic 2: System Hardening | 15% | - Kernel defaults and parameters using sysctl - Understand the concept of OPA (Open Policy Agent) and Gatekeeper - Modify host components to improve security - Enable audit logging |
| Topic 3: Cluster Setup | 10% | - Understand the security implications of embedding cloud provider flags - Use Cis benchmarks to check Kubernetes cluster settings - Use Pod Security Policies to control security-related pod behaviors - Use role-based access control (RBAC) to minimize exposure - Manage sensitive information in clusters - Implement Pod-to-Pod encryption using mTLS or WireGuard - Configure TLS certificates and minimum version for etcd |
| Topic 4: Monitoring, Logging, and Runtime Security | 20% | - Understand and monitor network traffic - Falco - container security monitoring and threat detection - Audit and detect logs and events for anomalies - Detect threats at the container level - Minimize the attack surface using container health indicators - Perform behavioral analytics to detect malicious activity |
| Topic 5: Cluster Hardening | 15% | - Minimize admission of containers with sharing the host IPC namespace - Minimize admission of containers with sharing the host network namespace - Minimize admission of containers that allow host namespaces - Minimize admission of containers without AppArmor profile - Minimize admission of containers with added capabilities - Minimize admission of containers without seccomp profiles - Minimize admission of containers with raw block devices - Minimize admission of containers without a security context - Minimize admission of containers with capabilities assigned - Minimize admission of containers with allowPrivilegeEscalation - Minimize admission of containers with hostPath volumes - Minimize admission of containers with sharing the host process namespace - Minimize admission of containers with FlexVolume volumes - Minimize admission of privileged containers |
| Topic 6: Supply Chain Security | 20% | - Understand the container build process - Use distroless images for static workload - Understand the software supply chain best practices - Understand image security scanning and its workflow - Use static analysis tools to detect vulnerabilities - Sign container images and verify signatures - Minimize base image footprint - Use image admission controllers to prevent use of untrusted images |
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NEW QUESTION # 11
SIMULATION
You can switch the cluster/configuration context using the following command:
[desk@cli] $ kubectl config use-context dev
A default-deny NetworkPolicy avoid to accidentally expose a Pod in a namespace that doesn't have any other NetworkPolicy defined.
Task: Create a new default-deny NetworkPolicy named deny-network in the namespace test for all traffic of type Ingress + Egress The new NetworkPolicy must deny all Ingress + Egress traffic in the namespace test.
Apply the newly created default-deny NetworkPolicy to all Pods running in namespace test.
You can find a skeleton manifests file at /home/cert_masters/network-policy.yaml
Answer:
Explanation:
See the Explanation below
Explanation:
master1 $ k get pods -n test --show-labels
NAME READY STATUS RESTARTS AGE LABELS
test-pod 1/1 Running 0 34s role=test,run=test-pod
testing 1/1 Running 0 17d run=testing
$ vim netpol.yaml
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: deny-network
namespace: test
spec:
podSelector: {}
policyTypes:
- Ingress
- Egress
master1 $ k apply -f netpol.yaml
Explanation:
controlplane $ k get pods -n test --show-labels
NAME READY STATUS RESTARTS AGE LABELS
test-pod 1/1 Running 0 34s role=test,run=test-pod
testing 1/1 Running 0 17d run=testing
master1 $ vim netpol1.yaml
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: deny-network
namespace: test
spec:
podSelector: {}
policyTypes:
- Ingress
- Egress
master1 $ k apply -f netpol1.yaml
Reference:
https://kubernetes.io/docs/concepts/services-networking/network-policies/ Explanation:
controlplane $ k get pods -n test --show-labels
NAME READY STATUS RESTARTS AGE LABELS
test-pod 1/1 Running 0 34s role=test,run=test-pod
testing 1/1 Running 0 17d run=testing
master1 $ vim netpol1.yaml
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: deny-network
namespace: test
spec:
podSelector: {}
policyTypes:
- Ingress
- Egress
master1 $ k apply -f netpol1.yaml
https://kubernetes.io/docs/concepts/services-networking/network-policies/
NEW QUESTION # 12
SIMULATION
Create a User named john, create the CSR Request, fetch the certificate of the user after approving it.
Create a Role name john-role to list secrets, pods in namespace john
Finally, Create a RoleBinding named john-role-binding to attach the newly created role john-role to the user john in the namespace john. To Verify: Use the kubectl auth CLI command to verify the permissions.
Answer:
Explanation:
se kubectl to create a CSR and approve it.
Get the list of CSRs:
kubectl get csr
Approve the CSR:
kubectl certificate approve myuser
Get the certificate
Retrieve the certificate from the CSR:
kubectl get csr/myuser -o yaml
here are the role and role-binding to give john permission to create NEW_CRD resource:
kubectl apply -f roleBindingJohn.yaml --as=john
rolebinding.rbac.authorization.k8s.io/john_external-rosource-rb created kind: RoleBinding apiVersion: rbac.authorization.k8s.io/v1 metadata:
name: john_crd
namespace: development-john
subjects:
- kind: User
name: john
apiGroup: rbac.authorization.k8s.io
roleRef:
kind: ClusterRole
name: crd-creation
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: crd-creation
rules:
- apiGroups: ["kubernetes-client.io/v1"]
resources: ["NEW_CRD"]
verbs: ["create, list, get"]
NEW QUESTION # 13
You are tasked with securing a Kubernetes cluster that runs a critical web application. The cluster iS deployed on AWS and uses a custom API server for authentication You are required to implement a security strategy that enforces strong authentication and authorization for accessing the Kubernetes API, while also minimizing the attack surface.
Answer:
Explanation:
Solution (Step by Step) :
1. configure RBAC:
- Define fine-grained Role-Based Access Control (RBAC) rules to restrict access to specific resources and actions based on user roles and permissions.
- Create roles and role bindings for different user groups, such as developers, operators, and security auditors.
- Example:
2. Enable TLS and Mutual TLS: - Configure the Kubernetes API server to use TLS for secure communication between the server and clients. - Implement Mutual TLS (mTLS) to enforce authentication for all API requests. - Example:
3. Configure API Server Authentication - Implement custom authentication mechanisms using plugins or external services to authenticate API requests. - Example:
4. Limit Access to Kubernetes API: - Configure network policies to restrict access to the Kubernetes API server from unauthorized sources. - Example:
5. Monitor and Audit API Activity: - Use audit logs to track API requests and identify potential security threats. - Example:
6. Use Security Best Practices: - Implement CIS Kubernetes Benchmark guidelines for configuring the Kubernetes cluster securely. - Example: - Enable strong password policies for all user accounts. - Restrict access to sensitive configuration files. - Regularly update the Kubernetes cluster and its components. 7. Implement a Secure Container Image Policy: - Implement a strict container image policy to ensure that only trusted images are deployed in the cluster. - Example: - Scan container images for vulnerabilities. - Require images to be signed by trusted parties. - Configure image signature verificatiom 8. Secure Kubernetes Secrets and Configuration: - Store sensitive data, such as passwords and API keys, in secrets. - Use secret management tools to securely access and rotate secrets. - Example: - Use Kubernetes Secrets to store credentials. - Implement a secret rotation policy. 9. Use Security Monitoring and Threat Detection Tools: - Deploy security monitoring and threat detection tools to identifry and respond to security incidents. - Example: - Integrate with a SIEM solution. - Use security tools like Falco to monitor for malicious activities. - Implement a security automation and response framework. 10. Regularly Review and Update Security Configuration: - Conduct periodic security audits and reviews to assess the effectiveness of security controls. - Keep security policies and procedures updated to address evolving threats. By implementing these security best practices, you can create a secure and resilient Kubernetes cluster for your critical web application.
NEW QUESTION # 14
You're designing a security policy for your Kubernetes cluster to restrict container image sources. You want to allow only images from your private registry and a few trusted public registries. How would you implement this policy using Admission Webhooks and what kind of validation logic would you implement in the webhook?
Answer:
Explanation:
Solution (Step by Step) :
1. Create Admission Webhook:
- Define a Kubernetes Admission Webhook that will intercept requests to create or modify pods.
- You'll need to create a webhook configuration and a service that will handle the validation logic-
- Example webhook configuration:
2. Implement Validation Logic (Service): - Create a service that will handle the webhook requests. This service should contain your validation logic. - The validation logic should check the container images used in the pod definitions. - Sample validation logic (Python using Flask, but you could use any language/framework): python from flask import Flask, request, jsonity import json
3. Deploy Service and Webhook: - Deploy your service and the webhook configuration. - Ensure that your service is accessible by the Kubernetes API server. 4. Test: - Create or update a pod with a container image from an allowed source. The webhook should allow it. - Create a pod with a container image from a disallowed source. The webhook should deny it.
NEW QUESTION # 15
You are running a Kubernetes cluster with a deployment named "my-app" that uses a container image from a public registry. The container image has a vulnerability in a library it uses. You want to prevent any container from using that vulnerable image. How would you implement this using a container image registry and admission control policies?
Answer:
Explanation:
Solution (Step by Step) :
1. Create a Custom Container Image Registry:
- Create a private container image registry, such as Harbor, JFrog Xray, or GitLab Container Registry to manage your container images and enforce security policies.
2. Configure Image Scanning and Policies:
- Set up image scanning in your chosen registry to automatically scan incoming images for vulnerabilities. Configure policies to block images with specific vulnerabilities or based on severity levels.
3. Set up Admission Control Policies:
- Configure Kubernetes admission control to enforce image scanning and registry-based access control.
- Use admission webhooks to intercept pod creation requests and verify that the container image used in the pod is authorized.
- For example, you can create an admission webhook that checks if the image is stored in your private registry and has passed vulnerability scanning.
If the image is not in the registry or has known vulnerabilities, the webhook will deny the pod creation.
4. Deploy the Vulnerability-Free Image:
- Update the container image used by your "my-app" deployment with a patched or vulnerability-free version. Push this updated image to your private registry.
5. Update the Deployment
- Update the "my-app" deployment configuration to pull the container image from your private registry.
6. Monitor and Evaluate:
- Monitor the logs of your container image registry and Kubernetes admission controller for any errors or blocked images. Regularly review the vulnerability scan reports for any new vulnerabilities.
NEW QUESTION # 16
......
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