如何使用'kubectl auth can -i... psp‘检查是否在命名空间中授权了podsecuritypolicy的'use’？

Question

返回以下错误：

error: you must specify two or three arguments: verb, resource, and optional resourceName

当我执行的时候：

kubectl auth --as=system:serviceaccount:mytest1:default can-i use psp 00-mytest1

我已经有了以下针对podsecuritypolicy (psp.yaml)、role (role.yaml)和rolebinding (rb.yaml)的清单，并部署在名称空间mytest1中。

psp.yaml

    apiVersion: policy/v1beta1
    kind: PodSecurityPolicy
    metadata:
      name: 00-mytest1
      labels: {}
      annotations:
        seccomp.security.alpha.kubernetes.io/allowedProfileNames: 'runtime/default'
        seccomp.security.alpha.kubernetes.io/defaultProfileName:  'runtime/default'
    spec:
      privileged: false
      allowPrivilegeEscalation: false
      requiredDropCapabilities:
      - ALL
      runAsUser:
        rule: 'MustRunAsNonRoot'
      runAsGroup:
        rule: 'MustRunAs'
        ranges:
        - min: 1000 
          max: 1000
        - min: 1
          max: 65535
      supplementalGroups:
        rule: 'MayRunAs'
        ranges:
        - min: 1
          max: 65535
      fsGroup:
        rule: 'MayRunAs'
        ranges:
        - min: 1
          max: 65535
      seLinux:
        rule: 'RunAsAny'
      hostNetwork: false
      hostIPC: false
      hostPID: false
      hostPorts: []
      volumes:
      - configMap
      - downwardAPI
      - emptyDir
      - projected
      - secret

role.yaml

    apiVersion: rbac.authorization.k8s.io/v1
    kind: Role
    metadata:
      name: mytest1
      namespace: "mytest1"
      labels: {}
    rules:
    - apiGroups: ['policy']
      resources: ['podsecuritypolicies']
      verbs:     ['use']
      resourceNames: ['00-mytest1']

和rb.yaml

    apiVersion: rbac.authorization.k8s.io/v1
    kind: RoleBinding
    metadata:
      name: mytest1
      namespace: "mytest1"
      labels: {}
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: Role
      name: mytest1
    subjects:
    - kind: ServiceAccount
      name: default
      namespace: "mytest1"

我期望返回kubectl auth can-i ...检查的yes或no，而不是上面提到的错误。身份验证检查的用例是否正确？我感谢他的指正。

Answer 1

您缺少标志--subresource。如果我执行

kubectl auth --as=system:serviceaccount:mytest1:default can-i use psp --subresource=00-mytest1

我有明确的答案。在我的情况下：

no

您还可以收到类似下面这样的警告：

Warning: resource 'podsecuritypolicies' is not namespace scoped in group 'policy'

但它与您的配置直接相关。

有关kubectl auth can-i命令的更多信息，请查看

kubectl auth can-i --help

在你的终端里。您还可以阅读this doc。