Restrict Seccomp

Description

Seccomp profile must not be explicitly set to Unconfined.

Restricted Fields

• spec.securityContext.seccompProfile.type
• spec.containers[*].securityContext.seccompProfile.type
• spec.initContainers[*].securityContext.seccompProfile.type
• spec.ephemeralContainers[*].securityContext.seccompProfile.type

Allowed Values

• Undefined/nil
• RuntimeDefault
• Localhost

Kyverno Policy

Refer to the Nirmata curated policies - restrict-seccomp.yaml

References

Configuration Settings

The below configuration indicates that if the deployed resource contains one of ephemeralContainers or initContainers or containers in their spec field, AND if securityContext.seccompProfile.type field is present, then the only acceptable values are RuntimeDefault or Localhost to be conformant with this security control. If the securityContext.seccompProfile.type field is not present, then the resource is conformant by default.

=(securityContext):
  =(seccompProfile):
    =(type): "RuntimeDefault | Localhost"      
=(ephemeralContainers):
- =(securityContext):
    =(seccompProfile):
      =(type): "RuntimeDefault | Localhost"
=(initContainers):
- =(securityContext):
    =(seccompProfile):
      =(type): "RuntimeDefault | Localhost"
containers:
- =(securityContext):
    =(seccompProfile):
      =(type): "RuntimeDefault | Localhost"

Resource Example

Below is a Deployment resource example where securityContext.seccompProfile.type is set to either Localhost or RuntimeDefault for both initContainers and containers.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: gooddeployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: app
  template:
    metadata:
      labels:
        app: app
    spec:
      initContainers:
      - name: initcontainer01
        image: dummyimagename
        securityContext:
          seccompProfile:
            type: Localhost
            localhostProfile: operator/default/profile1.json
      - name: initcontainer02
        image: dummyimagename
        securityContext:
          seccompProfile:
            type: RuntimeDefault
      containers:
      - name: container01
        image: dummyimagename