Assess Kubernetes Manifests with cnspec

Scan Kubernetes manifests for security misconfigurations during development and in CI/CD pipelines.

Use cnspec to scan Kubernetes manifests for security and best practices. You can assess manifests using the same policies that you rely on for testing your live clusters.

To scan a Kubernetes manifest, you need a Kubernetes policy. If you haven't already downloaded the Kubernetes Security by Mondoo policy, do so now.

From the directory where you downloaded the policy, run:

cnspec scan k8s MANIFESTFILE

For MANIFESTFILE, substitute the path to the manifest file you want to scan. For example, run:

cnspec scan k8s luna-postgres.yml

cnspec returns a report summarizing the scan results.

Show or hide example scan results.

→ loaded configuration from /Users/user/.config/mondoo/mondoo.yml using source default
→ using service account credentials
→ discover related assets for 1 asset(s)
→ discovery option auto is used. This will detect the assets: cluster, jobs, cronjobs, pods, statefulsets, deployments, replicasets, daemonsets
→ resolved assets resolved-assets=3
→ connecting to asset K8s Manifest luna-postgres (code)

██████████████████████████████████████████████████████████████████████████ 100% K8s Manifest luna-postgres
→ connecting to asset luna/postgresql (k8s-object)

███████████████████████████████████████████████████████████████████████████ 100% luna/postgres
→ connecting to asset luna/postgresql-secondary (k8s-object)

███████████████████████████████████████████████████████████████████████████ 100% luna/postgresql-secondary


Asset: K8s Manifest luna-postgresql
===================================
Data queries:
mondoo.version: "8.11.0"
platform.title: "Kubernetes Manifest"
platform.release: ""
mondoo.jobEnvironment: {
  id: "client.mondoo.com"
  name: "Mondoo Client"
}
platform.arch: ""

Checks:

Asset: luna/postgresql
======================
Data queries:
platform.arch: ""
mondoo.jobEnvironment: {
  id: "client.mondoo.com"
  name: "Mondoo Client"
}
platform.title: "Kubernetes Deployment, Kubernetes Manifest File"
mondoo.version: "8.11.0"
platform.release: ""

Checks:
✓ Pass:  Pod should not run with hostNetwork
✓ Pass:  Deployments should not run in the default namespace
✕ Fail:  A  80  Container should configure a livenessProbe
. Unknown: Pods should not run Kubernetes dashboard
✕ Fail:  F   0  Container should not run as root
✓ Pass:  Container should not allow privilege escalation
✕ Fail:  C  40  Container image pull should be consistent
✕ Fail:  A  80  Container should have a memory limit
✕ Fail:  D  20  Container should use an immutable root filesystem
✓ Pass:  Pod should not run with hostIPC
✕ Fail:  A  80  Container should configure a readinessProbe
✕ Fail:  D  20  Deployments should not run with NET_RAW capability
✓ Pass:  Container should not mount the CRI-O socket
✓ Pass:  Deployments should not run with SYS_ADMIN capability
✓ Pass:  Deployments should mount any host path volumes as read-only
✕ Fail:  A  80  Container should have a CPU limit
✓ Pass:  Deployments should not bind to a host port
✓ Pass:  Pod should not define hostAliases
✓ Pass:  Container should not mount the Docker socket
✕ Fail:  A  80  Container should request memory
. Unknown: Deployments should not run Tiller (Helm v2)
✓ Pass:  Container should not run as a privileged container
✓ Pass:  Container should not mount the containerd socket
✕ Fail:  A  80  Container should request CPU
✓ Pass:  Pod should not run with hostPID
✓ Pass:  Pod should not run with the default service account

Asset: luna/postgresql-secondary
================================
Data queries:
mondoo.version: "8.11.0"
mondoo.jobEnvironment: {
  id: "client.mondoo.com"
  name: "Mondoo Client"
}
platform.arch: ""
platform.title: "Kubernetes Deployment, Kubernetes Manifest File"
platform.release: ""

Checks:
✓ Pass:  Deployments should not run with SYS_ADMIN capability
✕ Fail:  F   0  Container should not run as root
✕ Fail:  A  80  Container should request memory
✓ Pass:  Pod should not run with hostPID
✕ Fail:  A  80  Container should have a memory limit
✓ Pass:  Pod should not run with hostNetwork
✓ Pass:  Container should not mount the CRI-O socket
✓ Pass:  Container should not run as a privileged container
. Unknown: Pods should not run Kubernetes dashboard
✓ Pass:  Pod should not run with the default service account
✕ Fail:  D  20  Container should use an immutable root filesystem
✓ Pass:  Deployments should mount any host path volumes as read-only
. Unknown: Deployments should not run Tiller (Helm v2)
✕ Fail:  A  80  Container should configure a readinessProbe
✕ Fail:  A  80  Container should have a CPU limit
✓ Pass:  Container should not allow privilege escalation
✕ Fail:  D  20  Deployments should not run with NET_RAW capability
✕ Fail:  C  40  Container image pull should be consistent
✓ Pass:  Deployments should not bind to a host port
✕ Fail:  A  80  Container should configure a livenessProbe
✕ Fail:  A  80  Container should request CPU
✓ Pass:  Deployments should not run in the default namespace
✓ Pass:  Container should not mount the containerd socket
✓ Pass:  Pod should not run with hostIPC
✓ Pass:  Pod should not define hostAliases
✓ Pass:  Container should not mount the Docker socket

To see scan results in full detail, run:

cnspec scan k8s -o full

Learn more about testing Kubernetes

To learn more about how the MQL query language works, read Write Effective MQL.
For a list of all the Kubernetes resources and fields you can query, read the Mondoo Kubernetes (K8s) Resource Pack Reference.

Assess Kubernetes Manifests with cnspec

Learn more about testing Kubernetes

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