# Copyright 2017 by the contributors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# This is an example of how to deploy AWS IAM Authenticator.
#
# To use this, you'll at least need to edit the role ARNs in the ConfigMap. You
# may also need to rework other bits to work in your cluster (e.g., node labels).
#
# This was tested with a kubeadm-installed cluster.
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: aws-iam-authenticator
rules:
- apiGroups:
  - iamauthenticator.k8s.aws
  resources:
  - iamidentitymappings
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - iamauthenticator.k8s.aws
  resources:
  - iamidentitymappings/status
  verbs:
  - patch
  - update
- apiGroups:
  - ""
  resources:
  - events
  verbs:
  - create
  - update
  - patch
- apiGroups:
  - ""
  resources:
  - configmaps
  verbs:
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - configmaps
  resourceNames:
  - aws-auth
  verbs:
  - get

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: aws-iam-authenticator
  namespace: kube-system

---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: aws-iam-authenticator
  namespace: kube-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: aws-iam-authenticator
subjects:
- kind: ServiceAccount
  name: aws-iam-authenticator
  namespace: kube-system

---
# EKS-Style ConfigMap: roles and users can be mapped in the same way as supported on EKS.
# If mappings are defined this way they do not need to be redefined on the other ConfigMap.
# https://docs.aws.amazon.com/eks/latest/userguide/add-user-role.html
# uncomment if using EKS-Style ConfigMap
# apiVersion: v1
# kind: ConfigMap
# metadata:
#   name: aws-auth
#   namespace: kube-system
# data:
#   mapRoles: |
#     - rolearn: <ARN of instance role (not instance profile)>
#       username: system:node:{{EC2PrivateDNSName}}
#       groups:
#         - system:bootstrappers
#         - system:nodes
#   mapUsers: |
#     - rolearn: arn:aws:iam::000000000000:user/Alice
#       username: alice
#       groups:
#         - system:masters

---
apiVersion: v1
kind: ConfigMap
metadata:
  namespace: kube-system
  name: aws-iam-authenticator
  labels:
    k8s-app: aws-iam-authenticator
data:
  config.yaml: |
    # a unique-per-cluster identifier to prevent replay attacks
    # (good choices are a random token or a domain name that will be unique to your cluster)
    clusterID: my-dev-cluster.example.com
    server:
      # each mapRoles entry maps an IAM role to a username and set of groups
      # Each username and group can optionally contain template parameters:
      #  1) "{{AccountID}}" is the 12 digit AWS ID.
      #  2) "{{SessionName}}" is the role session name, with `@` characters
      #     transliterated to `-` characters.
      #  3) "{{SessionNameRaw}}" is the role session name, without character
      #     transliteration (available in version >= 0.5).
      mapRoles:
      # statically map arn:aws:iam::000000000000:role/KubernetesAdmin to a cluster admin
      - roleARN: arn:aws:iam::000000000000:role/KubernetesAdmin
        username: kubernetes-admin
        groups:
        - system:masters
      # map EC2 instances in my "KubernetesNode" role to users like
      # "aws:000000000000:instance:i-0123456789abcdef0". Only use this if you
      # trust that the role can only be assumed by EC2 instances. If an IAM user
      # can assume this role directly (with sts:AssumeRole) they can control
      # SessionName.
      - roleARN: arn:aws:iam::000000000000:role/KubernetesNode
        username: aws:{{AccountID}}:instance:{{SessionName}}
        groups:
        - system:bootstrappers
        - aws:instances
      # map federated users in my "KubernetesAdmin" role to users like
      # "admin:alice-example.com". The SessionName is an arbitrary role name
      # like an e-mail address passed by the identity provider. Note that if this
      # role is assumed directly by an IAM User (not via federation), the user
      # can control the SessionName.
      - roleARN: arn:aws:iam::000000000000:role/KubernetesAdmin
        username: admin:{{SessionName}}
        groups:
        - system:masters
      # map federated users in my "KubernetesOtherAdmin" role to users like
      # "alice-example.com". The SessionName is an arbitrary role name
      # like an e-mail address passed by the identity provider. Note that if this
      # role is assumed directly by an IAM User (not via federation), the user
      # can control the SessionName.  Note that the "{{SessionName}}" macro is
      # quoted to ensure it is properly parsed as a string.
      - roleARN: arn:aws:iam::000000000000:role/KubernetesOtherAdmin
        username: "{{SessionName}}"
        groups:
        - system:masters
      # map federated users in my "KubernetesUsers" role to users like
      # "alice@example.com". SessionNameRaw is sourced from the same place as
      # SessionName with the distinction that no transformation is performed
      # on the value. For example an email addresses passed by an identity
      # provider will not have the `@` replaced with a `-`.
      - roleARN: arn:aws:iam::000000000000:role/KubernetesUsers
        username: "{{SessionNameRaw}}"
        groups:
        - developers
      # each mapUsers entry maps an IAM role to a static username and set of groups
      mapUsers:
      # map user IAM user Alice in 000000000000 to user "alice" in "system:masters"
      - userARN: arn:aws:iam::000000000000:user/Alice
        username: alice
        groups:
        - system:masters
      # List of Account IDs to whitelist for authentication
      mapAccounts:
      # - <AWS_ACCOUNT_ID>

---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  namespace: kube-system
  name: aws-iam-authenticator
  labels:
    k8s-app: aws-iam-authenticator
spec:
  selector:
    matchLabels:
      k8s-app: aws-iam-authenticator
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        k8s-app: aws-iam-authenticator
    spec:
      # use service account with access to
      serviceAccountName: aws-iam-authenticator

      # run on the host network (don't depend on CNI)
      hostNetwork: true

      # run on each control-plane node
      nodeSelector:
        node-role.kubernetes.io/control-plane: ""
      tolerations:
      - effect: NoSchedule
        key: node-role.kubernetes.io/control-plane
      - key: CriticalAddonsOnly
        operator: Exists

      # mark pod as critical to the cluster
      priorityClassName: system-cluster-critical

      # run `aws-iam-authenticator server` with three volumes
      # - config (mounted from the ConfigMap at /etc/aws-iam-authenticator/config.yaml)
      # - state (persisted TLS certificate and keys, mounted from the host)
      # - output (output kubeconfig to plug into your apiserver configuration, mounted from the host)
      containers:
      - name: aws-iam-authenticator
        image: 602401143452.dkr.ecr.us-west-2.amazonaws.com/amazon/aws-iam-authenticator:v0.6.26
        args:
        - server
        # uncomment if using EKS-Style ConfigMap
        # - --backend-mode=EKSConfigMap
        - --config=/etc/aws-iam-authenticator/config.yaml
        - --state-dir=/var/aws-iam-authenticator
        - --generate-kubeconfig=/etc/kubernetes/aws-iam-authenticator/kubeconfig.yaml
        # uncomment if using the Kops Usage instructions https://sigs.k8s.io/aws-iam-authenticator#kops-usage
        # the kubeconfig.yaml is pregenerated by the 'aws-iam-authenticator init' step
        # - --kubeconfig-pregenerated=true

        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            drop:
            - ALL
          seccompProfile:
            type: RuntimeDefault

        resources:
          requests:
            memory: 20Mi
            cpu: 10m
          limits:
            memory: 20Mi
            cpu: 100m

        volumeMounts:
        - name: config
          mountPath: /etc/aws-iam-authenticator/
        - name: state
          mountPath: /var/aws-iam-authenticator/
        - name: output
          mountPath: /etc/kubernetes/aws-iam-authenticator/

      volumes:
      - name: config
        configMap:
          name: aws-iam-authenticator
      - name: output
        hostPath:
          path: /etc/kubernetes/aws-iam-authenticator/
      - name: state
        hostPath:
          path: /var/aws-iam-authenticator/