mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-11-12 13:18:51 +00:00
124 lines
4.2 KiB
Go
124 lines
4.2 KiB
Go
/*
|
|
Copyright 2016 The Kubernetes Authors.
|
|
|
|
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.
|
|
*/
|
|
|
|
package node
|
|
|
|
import (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"strings"
|
|
|
|
kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/api"
|
|
kubeadmutil "k8s.io/kubernetes/cmd/kubeadm/app/util"
|
|
"k8s.io/kubernetes/pkg/apis/certificates"
|
|
unversionedcertificates "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/certificates/unversioned"
|
|
"k8s.io/kubernetes/pkg/client/restclient"
|
|
"k8s.io/kubernetes/pkg/client/typed/discovery"
|
|
"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
|
|
clientcmdapi "k8s.io/kubernetes/pkg/client/unversioned/clientcmd/api"
|
|
"k8s.io/kubernetes/pkg/kubelet/util/csr"
|
|
certutil "k8s.io/kubernetes/pkg/util/cert"
|
|
)
|
|
|
|
// PerformTLSBootstrap creates a RESTful client in order to execute certificate signing request.
|
|
func PerformTLSBootstrap(s *kubeadmapi.KubeadmConfig, apiEndpoint string, caCert []byte) (*clientcmdapi.Config, error) {
|
|
// TODO try all the api servers until we find one that works
|
|
bareClientConfig := kubeadmutil.CreateBasicClientConfig("kubernetes", apiEndpoint, caCert)
|
|
|
|
// Try to fetch the hostname of the node
|
|
nodeName, err := os.Hostname()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("<node/csr> failed to get node hostname [%v]", err)
|
|
}
|
|
|
|
bootstrapClientConfig, err := clientcmd.NewDefaultClientConfig(
|
|
*kubeadmutil.MakeClientConfigWithToken(
|
|
bareClientConfig, "kubernetes", fmt.Sprintf("kubelet-%s", nodeName), s.Secrets.BearerToken,
|
|
),
|
|
&clientcmd.ConfigOverrides{},
|
|
).ClientConfig()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("<node/csr> failed to create API client configuration [%s]", err)
|
|
}
|
|
|
|
err = checkCertsAPI(bootstrapClientConfig)
|
|
|
|
if err != nil {
|
|
return nil, fmt.Errorf("<node/csr> API compatibility error [%s]", err)
|
|
}
|
|
|
|
client, err := unversionedcertificates.NewForConfig(bootstrapClientConfig)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("<node/csr> failed to create API client [%s]", err)
|
|
}
|
|
csrClient := client.CertificateSigningRequests()
|
|
|
|
fmt.Println("<node/csr> created API client to obtain unique certificate for this node, generating keys and certificate signing request")
|
|
|
|
key, err := certutil.MakeEllipticPrivateKeyPEM()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("<node/csr> failed to generating private key [%s]", err)
|
|
}
|
|
|
|
cert, err := csr.RequestNodeCertificate(csrClient, key, nodeName)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("<node/csr> failed to request signed certificate from the API server [%s]", err)
|
|
}
|
|
|
|
// TODO print some basic info about the cert
|
|
fmt.Println("<node/csr> received signed certificate from the API server, generating kubelet configuration")
|
|
|
|
finalConfig := kubeadmutil.MakeClientConfigWithCerts(
|
|
bareClientConfig, "kubernetes", fmt.Sprintf("kubelet-%s", nodeName),
|
|
key, cert,
|
|
)
|
|
|
|
return finalConfig, nil
|
|
}
|
|
|
|
func checkCertsAPI(config *restclient.Config) error {
|
|
discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
|
|
|
|
if err != nil {
|
|
return fmt.Errorf("failed to create API discovery client [%s]", err)
|
|
}
|
|
|
|
serverGroups, err := discoveryClient.ServerGroups()
|
|
|
|
if err != nil {
|
|
return fmt.Errorf("failed to retrieve a list of supported API objects [%s]", err)
|
|
}
|
|
|
|
for _, group := range serverGroups.Groups {
|
|
if group.Name == certificates.GroupName {
|
|
return nil
|
|
}
|
|
}
|
|
|
|
version, err := discoveryClient.ServerVersion()
|
|
serverVersion := version.String()
|
|
|
|
if err != nil {
|
|
serverVersion = "N/A"
|
|
}
|
|
|
|
// Due to changes in API namespaces for certificates
|
|
// https://github.com/kubernetes/kubernetes/pull/31887/
|
|
// it is compatible only with versions released after v1.4.0-beta.0
|
|
return fmt.Errorf("installed Kubernetes API server version \"%s\" does not support certificates signing request use v1.4.0 or newer", serverVersion)
|
|
}
|