RBAC 的 EKS Kubernetes 用户被视为 system:anonymous

Question

我一直在关注 this post 创建用户对我的 kubernetes 集群的访问权限（运行ning 在 Amazon EKS 上）。我确实创建了密钥，csr，批准了请求并为用户下载了证书。然后我用密钥和 crt 创建了一个 kubeconfig 文件。当我使用这个 kubeconfig 运行 kubectl 时，我被识别为 system:anonymous.

$ kubectl --kubeconfig test-user-2.kube.yaml get pods
Error from server (Forbidden): pods is forbidden: User "system:anonymous" cannot list pods in the namespace "default"

我希望用户能够被识别但被拒绝访问。

$ kubectl --kubeconfig test-user-2.kube.yaml version
Client Version: version.Info{Major:"1", Minor:"11", GitVersion:"v1.11.1", GitCommit:"b1b29978270dc22fecc592ac55d903350454310a", GitTreeState:"clean", BuildDate:"2018-07-18T11:37:06Z", GoVersion:"go1.10.3", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.3", GitCommit:"2bba0127d85d5a46ab4b778548be28623b32d0b0", GitTreeState:"clean", BuildDate:"2018-05-28T20:13:43Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}


$ kubectl --kubeconfig test-user-2.kube.yaml config view
apiVersion: v1
clusters:
- cluster:
    insecure-skip-tls-verify: true
    server: REDACTED
  name: kubernetes
contexts:
- context:
    cluster: kubernetes
    user: test-user-2
  name: kubernetes
current-context: kubernetes
kind: Config
preferences: {}
users:
- name: test-user-2
  user:
    client-certificate-data: REDACTED
    client-key-data: REDACTED

# running with my other account (which uses heptio-authenticator-aws)
$ kubectl describe certificatesigningrequest.certificates.k8s.io/user-request-test-user-2
Name:               user-request-test-user-2
Labels:             <none>
Annotations:        <none>
CreationTimestamp:  Wed, 01 Aug 2018 15:20:15 +0200
Requesting User:
Status:             Approved,Issued
Subject:
         Common Name:    test-user-2
         Serial Number:
Events:  <none>

我确实为该用户创建了一个具有 admin（也尝试过 cluster-admin）角色的 ClusterRoleBinding，但这对这一步应该无关紧要。我不确定如何进一步调试 1) 是否创建了用户或 2) 如果我错过了一些配置。

感谢任何帮助！

Answer 1

这似乎是 EKS 的限制。即使 CSR 已获批准，用户也无法进行身份验证。我在另一个 kubernetes 集群上使用了相同的程序，它运行良好。

Answer 2

如本文所述article：

When you create an Amazon EKS cluster, the IAM entity user or role (for example, for federated users) that creates the cluster is automatically granted system:master permissions in the cluster's RBAC configuration. To grant additional AWS users or roles the ability to interact with your cluster, you must edit the aws-auth ConfigMap within Kubernetes.

检查您的集群是否应用了 aws-auth ConfigMap：
```
kubectl describe configmap -n kube-system aws-auth
```
如果存在ConfigMap，则跳过此步骤并继续执行步骤3。如果尚未应用 ConfigMap，则应执行以下操作：

下载库存 ConfigMap：

curl -O https://amazon-eks.s3-us-west-2.amazonaws.com/1.10.3/2018-07-26/aws-auth-cm.yaml

使用 rolearn: 中的 NodeInstanceRole ARN 对其进行调整。要获取 NodeInstanceRole 值，请查看 this manual，您将在步骤 3.8 - 3.10 中找到它。

data:
  mapRoles: |
    - rolearn: <ARN of instance role (not instance profile)>

将此配置映射应用到集群：

kubectl apply -f aws-auth-cm.yaml

等待集群节点准备就绪：

kubectl get nodes --watch

编辑 aws-auth ConfigMap 并根据以下示例将用户添加到其中：

kubectl edit -n kube-system configmap/aws-auth

# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: v1
data:
  mapRoles: |
    - rolearn: arn:aws:iam::555555555555:role/devel-worker-nodes-NodeInstanceRole-74RF4UBDUKL6
      username: system:node:{{EC2PrivateDNSName}}
      groups:
        - system:bootstrappers
        - system:nodes
  mapUsers: |
    - userarn: arn:aws:iam::555555555555:user/admin
      username: admin
      groups:
        - system:masters
    - userarn: arn:aws:iam::111122223333:user/ops-user
      username: ops-user
      groups:
        - system:masters

保存并退出编辑器。

按照 this manual.

Answer 3

我今天从 AWS 支持那里得到了这个。

Thanks for your patience. I have just heard back from the EKS team. They have confirmed that the aws-iam-authenticator has to be used with EKS and, because of that, it is not possible to authenticate using certificates.

没听说以后会不会支持这个，目前肯定是坏掉了

RBAC 的 EKS Kubernetes 用户被视为 system:anonymous

EKS Kubernetes user with RBAC seen as system:anonymous

kubernetes

kubernetes-security

amazon-eks