59561efb78
As of 1.8.0 kubelet in kubeadm configuration ships with enabled feature of node certificate autorotation, it makes sense to enable automatic certificate rotation csr signing. It will help to avoid issues like described in #53231 and #53237.
122 lines
5.1 KiB
Go
122 lines
5.1 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 node
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import (
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"fmt"
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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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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/kubernetes/cmd/kubeadm/app/constants"
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"k8s.io/kubernetes/cmd/kubeadm/app/util/apiclient"
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"k8s.io/kubernetes/pkg/util/version"
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)
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const (
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// NodeBootstrapperClusterRoleName defines the name of the auto-bootstrapped ClusterRole for letting someone post a CSR
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// TODO: This value should be defined in an other, generic authz package instead of here
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NodeBootstrapperClusterRoleName = "system:node-bootstrapper"
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// NodeKubeletBootstrap defines the name of the ClusterRoleBinding that lets kubelets post CSRs
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NodeKubeletBootstrap = "kubeadm:kubelet-bootstrap"
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// CSRAutoApprovalClusterRoleName defines the name of the auto-bootstrapped ClusterRole for making the csrapprover controller auto-approve the CSR
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// TODO: This value should be defined in an other, generic authz package instead of here
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// Starting from v1.8, CSRAutoApprovalClusterRoleName is automatically created by the API server on startup
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CSRAutoApprovalClusterRoleName = "system:certificates.k8s.io:certificatesigningrequests:nodeclient"
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// NodeSelfCSRAutoApprovalClusterRoleName is a role defined in default 1.8 RBAC policies for automatic CSR approvals for automatically rotated node certificates
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NodeSelfCSRAutoApprovalClusterRoleName = "system:certificates.k8s.io:certificatesigningrequests:selfnodeclient"
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// NodeAutoApproveBootstrapClusterRoleBinding defines the name of the ClusterRoleBinding that makes the csrapprover approve node CSRs
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NodeAutoApproveBootstrapClusterRoleBinding = "kubeadm:node-autoapprove-bootstrap"
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// NodeAutoApproveCertificateRotationClusterRoleBinding defines name of the ClusterRoleBinding that makes the csrapprover approve node auto rotated CSRs
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NodeAutoApproveCertificateRotationClusterRoleBinding = "kubeadm:node-autoapprove-certificate-rotation"
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)
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// AllowBootstrapTokensToPostCSRs creates RBAC rules in a way the makes Node Bootstrap Tokens able to post CSRs
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func AllowBootstrapTokensToPostCSRs(client clientset.Interface, k8sVersion *version.Version) error {
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fmt.Println("[bootstraptoken] Configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials")
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return apiclient.CreateOrUpdateClusterRoleBinding(client, &rbac.ClusterRoleBinding{
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ObjectMeta: metav1.ObjectMeta{
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Name: NodeKubeletBootstrap,
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},
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RoleRef: rbac.RoleRef{
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APIGroup: rbac.GroupName,
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Kind: "ClusterRole",
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Name: NodeBootstrapperClusterRoleName,
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},
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Subjects: []rbac.Subject{
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{
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Kind: rbac.GroupKind,
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Name: constants.GetNodeBootstrapTokenAuthGroup(k8sVersion),
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},
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},
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})
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}
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// AutoApproveNodeBootstrapTokens creates RBAC rules in a way that makes Node Bootstrap Tokens' CSR auto-approved by the csrapprover controller
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func AutoApproveNodeBootstrapTokens(client clientset.Interface, k8sVersion *version.Version) error {
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fmt.Println("[bootstraptoken] Configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token")
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// Always create this kubeadm-specific binding though
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return apiclient.CreateOrUpdateClusterRoleBinding(client, &rbac.ClusterRoleBinding{
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ObjectMeta: metav1.ObjectMeta{
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Name: NodeAutoApproveBootstrapClusterRoleBinding,
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},
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RoleRef: rbac.RoleRef{
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APIGroup: rbac.GroupName,
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Kind: "ClusterRole",
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Name: CSRAutoApprovalClusterRoleName,
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},
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Subjects: []rbac.Subject{
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{
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Kind: "Group",
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Name: constants.GetNodeBootstrapTokenAuthGroup(k8sVersion),
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},
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},
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})
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}
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// AutoApproveNodeCertificateRotation creates RBAC rules in a way that makes Node certificate rotation CSR auto-approved by the csrapprover controller
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func AutoApproveNodeCertificateRotation(client clientset.Interface, k8sVersion *version.Version) error {
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// Create autorotation cluster role binding only if we deploying or upgrading to version that supports it.
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if k8sVersion.AtLeast(constants.MinimumCSRAutoApprovalClusterRolesVersion) {
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fmt.Println("[bootstraptoken] Configured RBAC rules to allow certificate rotation for all node client certificates in the cluster")
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return apiclient.CreateOrUpdateClusterRoleBinding(client, &rbac.ClusterRoleBinding{
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ObjectMeta: metav1.ObjectMeta{
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Name: NodeAutoApproveCertificateRotationClusterRoleBinding,
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},
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RoleRef: rbac.RoleRef{
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APIGroup: rbac.GroupName,
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Kind: "ClusterRole",
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Name: NodeSelfCSRAutoApprovalClusterRoleName,
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},
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Subjects: []rbac.Subject{
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{
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Kind: "Group",
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Name: constants.NodesGroup,
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},
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},
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})
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}
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return nil
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}
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