Security Attributes for Cluster Operator

[3rk1n]

Hi,

I want to close two security recommendations for Kubernetes Cluster in Microsoft Defender for Cloud.

One of them is "Kubernetes clusters should disable automounting API credentials" and it can be solved by added "automountServiceAccountToken: false" for POD security "spec --> template --> spec"

spec:
  template:
    metadata:
    spec:
      automountServiceAccountToken: false

But when I am adding this values the pods give me CrashLoopBackOff status and that logs in below, and I can not see that spec in Pod level.

How can I solve this?

{"level":"error","ts":"2023-06-19T06:53:56Z","logger":"controller-runtime.client.config","msg":"unable to load in-cluster config","error":"open /var/run/secrets/kubernetes.io/serviceaccount/token: no such file or directory","stacktrace":"sigs.k8s.io/controller-runtime/pkg/client/config.loadConfig.func1\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.0/pkg/client/config/config.go:133\nsigs.k8s.io/controller-runtime/pkg/client/config.loadConfig\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.0/pkg/client/config/config.go:155\nsigs.k8s.io/controller-runtime/pkg/client/config.GetConfigWithContext\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.0/pkg/client/config/config.go:97\nsigs.k8s.io/controller-runtime/pkg/client/config.GetConfig\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.0/pkg/client/config/config.go:77\nsigs.k8s.io/controller-runtime/pkg/client/config.GetConfigOrDie\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.0/pkg/client/config/config.go:175\nmain.main\n\t/workspace/main.go:131\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:250"}
{"level":"error","ts":"2023-06-19T06:53:56Z","logger":"controller-runtime.client.config","msg":"unable to get kubeconfig","error":"invalid configuration: no configuration has been provided, try setting KUBERNETES_MASTER environment variable","errorCauses":[{"error":"no configuration has been provided, try setting KUBERNETES_MASTER environment variable"}],"stacktrace":"sigs.k8s.io/controller-runtime/pkg/client/config.GetConfigOrDie\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.0/pkg/client/config/config.go:177\nmain.main\n\t/workspace/main.go:131\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:250"}

The second is "Running containers as root user should be avoided" and it can be solved by added "securityContext"

1. for POD security "spec --> template --> spec" add "securityContext:" and under it add "runAsNonRoot: true, runAsGroup: , runAsUser: "

spec:
  template:
    metadata:
    spec:
      securityContext:
        runAsNonRoot: true
        runAsGroup: <Group-ID>
        runAsUser: <User-ID>

2. for CONTAINER security "spec --> template --> spec --> containers" add "securityContext:" and under it add "readOnlyRootFilesystem: true", "allowPrivilegeEscalation: false", "privileged: false", "runAsNonRoot: true" "runAsGroup: ", "runAsUser: " and "capabilities: drop: - ALL"

spec:
  template:
    metadata:
    spec:
      securityContext:
        runAsNonRoot: true
        runAsGroup: <Group-ID>
        runAsUser: <User-ID>
      containers:
      - name: <Name-of-Deployment>
        image: <Name-of-Image>
        securityContext:
          readOnlyRootFilesystem: true
          allowPrivilegeEscalation: false
          privileged: false
          runAsNonRoot: true
          runAsGroup: <Group-ID>
          runAsUser: <User-ID>
          capabilities:
            drop:
            - ALL

How can I add this spec with correct values for runAsGroup: <Group-ID> and runAsUser: <User-ID> ?
Should I add any values for Dockerfile and how can I add?