77 lines
2.3 KiB
Go
77 lines
2.3 KiB
Go
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/*
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Copyright 2016 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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"os"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
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clientcmdapi "k8s.io/kubernetes/pkg/client/unversioned/clientcmd/api"
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"k8s.io/kubernetes/pkg/kubelet/util/csr"
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certutil "k8s.io/kubernetes/pkg/util/cert"
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)
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// PerformTLSBootstrap executes a node certificate signing request.
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func PerformTLSBootstrap(cfg *clientcmdapi.Config) error {
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hostName, err := os.Hostname()
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if err != nil {
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return err
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}
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name := types.NodeName(hostName)
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rc, err := clientcmd.NewDefaultClientConfig(*cfg, &clientcmd.ConfigOverrides{}).ClientConfig()
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if err != nil {
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return err
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}
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c, err := clientset.NewForConfig(rc)
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if err != nil {
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return err
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}
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fmt.Println("[csr] Created API client to obtain unique certificate for this node, generating keys and certificate signing request")
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key, err := certutil.MakeEllipticPrivateKeyPEM()
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if err != nil {
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return fmt.Errorf("failed to generate private key [%v]", err)
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}
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// Make sure there are no other nodes in the cluster with identical node name.
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if err := checkForNodeNameDuplicates(c); err != nil {
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return err
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}
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cert, err := csr.RequestNodeCertificate(c.Certificates().CertificateSigningRequests(), key, name)
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if err != nil {
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return fmt.Errorf("failed to request signed certificate from the API server [%v]", err)
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}
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fmt.Printf("[csr] Received signed certificate from the API server")
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fmt.Println("[csr] Generating kubelet configuration")
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cfg.AuthInfos["kubelet"] = &clientcmdapi.AuthInfo{
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ClientKeyData: key,
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ClientCertificateData: cert,
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}
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cfg.Contexts["kubelet"] = &clientcmdapi.Context{
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AuthInfo: "kubelet",
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Cluster: cfg.Contexts[cfg.CurrentContext].Cluster,
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}
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cfg.CurrentContext = "kubelet"
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return nil
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}
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