111 lines
3.8 KiB
Go
111 lines
3.8 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package clusterinfo
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import (
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"fmt"
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"github.com/golang/glog"
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"k8s.io/api/core/v1"
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rbac "k8s.io/api/rbac/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apiserver/pkg/authentication/user"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/client-go/tools/clientcmd"
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clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
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bootstrapapi "k8s.io/cluster-bootstrap/token/api"
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"k8s.io/kubernetes/cmd/kubeadm/app/util/apiclient"
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rbachelper "k8s.io/kubernetes/pkg/apis/rbac/v1"
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)
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const (
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// BootstrapSignerClusterRoleName sets the name for the ClusterRole that allows access to ConfigMaps in the kube-public ns
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BootstrapSignerClusterRoleName = "kubeadm:bootstrap-signer-clusterinfo"
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)
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// CreateBootstrapConfigMapIfNotExists creates the kube-public ConfigMap if it doesn't exist already
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func CreateBootstrapConfigMapIfNotExists(client clientset.Interface, file string) error {
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fmt.Printf("[bootstraptoken] creating the %q ConfigMap in the %q namespace\n", bootstrapapi.ConfigMapClusterInfo, metav1.NamespacePublic)
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glog.V(1).Infoln("[bootstraptoken] loading admin kubeconfig")
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adminConfig, err := clientcmd.LoadFromFile(file)
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if err != nil {
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return fmt.Errorf("failed to load admin kubeconfig [%v]", err)
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}
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adminCluster := adminConfig.Contexts[adminConfig.CurrentContext].Cluster
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// Copy the cluster from admin.conf to the bootstrap kubeconfig, contains the CA cert and the server URL
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glog.V(1).Infoln("[bootstraptoken] copying the cluster from admin.conf to the bootstrap kubeconfig")
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bootstrapConfig := &clientcmdapi.Config{
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Clusters: map[string]*clientcmdapi.Cluster{
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"": adminConfig.Clusters[adminCluster],
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},
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}
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bootstrapBytes, err := clientcmd.Write(*bootstrapConfig)
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if err != nil {
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return err
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}
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// Create or update the ConfigMap in the kube-public namespace
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glog.V(1).Infoln("[bootstraptoken] creating/updating ConfigMap in kube-public namespace")
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return apiclient.CreateOrUpdateConfigMap(client, &v1.ConfigMap{
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ObjectMeta: metav1.ObjectMeta{
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Name: bootstrapapi.ConfigMapClusterInfo,
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Namespace: metav1.NamespacePublic,
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},
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Data: map[string]string{
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bootstrapapi.KubeConfigKey: string(bootstrapBytes),
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},
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})
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}
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// CreateClusterInfoRBACRules creates the RBAC rules for exposing the cluster-info ConfigMap in the kube-public namespace to unauthenticated users
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func CreateClusterInfoRBACRules(client clientset.Interface) error {
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glog.V(1).Infoln("creating the RBAC rules for exposing the cluster-info ConfigMap in the kube-public namespace")
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err := apiclient.CreateOrUpdateRole(client, &rbac.Role{
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ObjectMeta: metav1.ObjectMeta{
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Name: BootstrapSignerClusterRoleName,
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Namespace: metav1.NamespacePublic,
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},
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Rules: []rbac.PolicyRule{
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rbachelper.NewRule("get").Groups("").Resources("configmaps").Names(bootstrapapi.ConfigMapClusterInfo).RuleOrDie(),
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},
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})
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if err != nil {
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return err
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}
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return apiclient.CreateOrUpdateRoleBinding(client, &rbac.RoleBinding{
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ObjectMeta: metav1.ObjectMeta{
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Name: BootstrapSignerClusterRoleName,
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Namespace: metav1.NamespacePublic,
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},
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RoleRef: rbac.RoleRef{
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APIGroup: rbac.GroupName,
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Kind: "Role",
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Name: BootstrapSignerClusterRoleName,
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},
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Subjects: []rbac.Subject{
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{
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Kind: rbac.UserKind,
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Name: user.Anonymous,
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},
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},
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})
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}
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