k3s/cmd/kubeadm/app/node/csr.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"
	"os"

	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(phase1+) try all the api servers until we find one that works
	bareClientConfig := kubeadmutil.CreateBasicClientConfig("kubernetes", apiEndpoint, caCert)

	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)
	}

	client, err := unversionedcertificates.NewForConfig(bootstrapClientConfig)
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to create API client [%s]", err)
	}
	csrClient := client.CertificateSigningRequests()

	// TODO(phase1+) checkCertsAPI() has a side-effect of making first attempt of communicating with the API,
	// we should _make it more explicit_ and have a user-settable _retry timeout_ to account for potential connectivity issues
	// (for example user may be bringing up machines in parallel and for some reasons master is slow to boot)

	if err := checkCertsAPI(bootstrapClientConfig); err != nil {
		return nil, fmt.Errorf("<node/csr> fialed to proceed due to API compatibility issue - %s", err)
	}

	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(phase1+) 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()
	if err != nil {
		return fmt.Errorf("unable to obtain API version [%s]", err)
	}

	return fmt.Errorf("API version %s does not support certificates API, use v1.4.0 or newer", version.String())
}