121 lines
4.3 KiB
Go
121 lines
4.3 KiB
Go
/*
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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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kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
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kubeadmutil "k8s.io/kubernetes/cmd/kubeadm/app/util"
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"k8s.io/kubernetes/pkg/apis/certificates"
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unversionedcertificates "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/certificates/unversioned"
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"k8s.io/kubernetes/pkg/client/restclient"
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"k8s.io/kubernetes/pkg/client/typed/discovery"
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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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"k8s.io/kubernetes/pkg/types"
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certutil "k8s.io/kubernetes/pkg/util/cert"
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)
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// PerformTLSBootstrap creates a RESTful client in order to execute certificate signing request.
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func PerformTLSBootstrap(s *kubeadmapi.NodeConfiguration, apiEndpoint string, caCert []byte) (*clientcmdapi.Config, error) {
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// TODO(phase1+) try all the api servers until we find one that works
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bareClientConfig := kubeadmutil.CreateBasicClientConfig("kubernetes", apiEndpoint, caCert)
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hostName, err := os.Hostname()
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if err != nil {
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return nil, fmt.Errorf("<node/csr> failed to get node hostname [%v]", err)
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}
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// TODO(phase1+) https://github.com/kubernetes/kubernetes/issues/33641
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nodeName := types.NodeName(hostName)
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bootstrapClientConfig, err := clientcmd.NewDefaultClientConfig(
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*kubeadmutil.MakeClientConfigWithToken(
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bareClientConfig, "kubernetes", fmt.Sprintf("kubelet-%s", nodeName), s.Secrets.BearerToken,
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),
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&clientcmd.ConfigOverrides{},
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).ClientConfig()
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if err != nil {
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return nil, fmt.Errorf("<node/csr> failed to create API client configuration [%v]", err)
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}
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client, err := unversionedcertificates.NewForConfig(bootstrapClientConfig)
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if err != nil {
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return nil, fmt.Errorf("<node/csr> failed to create API client [%v]", err)
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}
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csrClient := client.CertificateSigningRequests()
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// TODO(phase1+) https://github.com/kubernetes/kubernetes/issues/33643
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if err := checkCertsAPI(bootstrapClientConfig); err != nil {
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return nil, fmt.Errorf("<node/csr> failed to proceed due to API compatibility issue - %v", err)
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}
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fmt.Println("<node/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 nil, fmt.Errorf("<node/csr> failed to generating private key [%v]", err)
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}
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cert, err := csr.RequestNodeCertificate(csrClient, key, nodeName)
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if err != nil {
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return nil, fmt.Errorf("<node/csr> failed to request signed certificate from the API server [%v]", err)
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}
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fmtCert, err := certutil.FormatBytesCert(cert)
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if err != nil {
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return nil, fmt.Errorf("<node/csr> failed to format certificate [%v]", err)
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}
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fmt.Printf("<node/csr> received signed certificate from the API server:\n%s\n", fmtCert)
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fmt.Println("<node/csr> generating kubelet configuration")
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finalConfig := kubeadmutil.MakeClientConfigWithCerts(
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bareClientConfig, "kubernetes", fmt.Sprintf("kubelet-%s", nodeName),
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key, cert,
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)
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return finalConfig, nil
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}
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func checkCertsAPI(config *restclient.Config) error {
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discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
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if err != nil {
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return fmt.Errorf("failed to create API discovery client [%v]", err)
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}
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serverGroups, err := discoveryClient.ServerGroups()
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if err != nil {
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return fmt.Errorf("failed to retrieve a list of supported API objects [%v]", err)
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}
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for _, group := range serverGroups.Groups {
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if group.Name == certificates.GroupName {
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return nil
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}
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}
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version, err := discoveryClient.ServerVersion()
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if err != nil {
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return fmt.Errorf("unable to obtain API version [%v]", err)
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}
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return fmt.Errorf("API version %s does not support certificates API, use v1.4.0 or newer", version.String())
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}
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