Example #1
0
// PerformTLSBootstrap executes a certificate signing request with the
// provided connection details.
func PerformTLSBootstrap(connection *ConnectionDetails) (*clientcmdapi.Config, error) {
	csrClient := connection.CertClient.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 [%v]", err)
	}
	cert, err := csr.RequestNodeCertificate(csrClient, key, connection.NodeName)
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to request signed certificate from the API server [%v]", err)
	}
	fmtCert, err := certutil.FormatBytesCert(cert)
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to format certificate [%v]", err)
	}
	fmt.Printf("<node/csr> received signed certificate from the API server:\n%s\n", fmtCert)
	fmt.Println("<node/csr> generating kubelet configuration")

	bareClientConfig := kubeadmutil.CreateBasicClientConfig("kubernetes", connection.Endpoint, connection.CACert)
	finalConfig := kubeadmutil.MakeClientConfigWithCerts(
		bareClientConfig, "kubernetes", fmt.Sprintf("kubelet-%s", connection.NodeName),
		key, cert,
	)

	return finalConfig, nil
}
Example #2
0
// 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)

	hostName, err := os.Hostname()
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to get node hostname [%v]", err)
	}

	// TODO: hostname == nodename doesn't hold on all clouds (AWS).
	// But we don't have a cloudprovider, so we're stuck.
	glog.Errorf("assuming that hostname is the same as NodeName")
	nodeName := types.NodeName(hostName)

	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 [%v]", err)
	}

	client, err := unversionedcertificates.NewForConfig(bootstrapClientConfig)
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to create API client [%v]", 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> failed to proceed due to API compatibility issue - %v", 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 [%v]", 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 [%v]", 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
}
Example #3
0
// PerformTLSBootstrap creates a RESTful client in order to execute certificate signing request.
func PerformTLSBootstrap(s *kubeadmapi.NodeConfiguration, 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)

	hostName, err := os.Hostname()
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to get node hostname [%v]", err)
	}

	// TODO(phase1+) https://github.com/kubernetes/kubernetes/issues/33641
	nodeName := types.NodeName(hostName)

	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 [%v]", err)
	}

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

	// TODO(phase1+) https://github.com/kubernetes/kubernetes/issues/33643

	if err := checkCertsAPI(bootstrapClientConfig); err != nil {
		return nil, fmt.Errorf("<node/csr> failed to proceed due to API compatibility issue - %v", 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 [%v]", 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 [%v]", err)
	}
	fmtCert, err := certutil.FormatBytesCert(cert)
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to format certificate [%v]", err)
	}
	fmt.Printf("<node/csr> received signed certificate from the API server:\n%s\n", fmtCert)
	fmt.Println("<node/csr> generating kubelet configuration")
	finalConfig := kubeadmutil.MakeClientConfigWithCerts(
		bareClientConfig, "kubernetes", fmt.Sprintf("kubelet-%s", nodeName),
		key, cert,
	)

	return finalConfig, nil
}
Example #4
0
// PerformTLSBootstrap executes a node certificate signing request.
func PerformTLSBootstrap(cfg *clientcmdapi.Config) error {
	hostName, err := os.Hostname()
	if err != nil {
		return err
	}
	name := types.NodeName(hostName)

	rc, err := clientcmd.NewDefaultClientConfig(*cfg, &clientcmd.ConfigOverrides{}).ClientConfig()
	if err != nil {
		return err
	}
	c, err := clientset.NewForConfig(rc)
	if err != nil {
		return err
	}
	fmt.Println("[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 fmt.Errorf("failed to generate private key [%v]", err)
	}

	// Make sure there are no other nodes in the cluster with identical node name.
	if err := checkForNodeNameDuplicates(c); err != nil {
		return err
	}

	cert, err := csr.RequestNodeCertificate(c.Certificates().CertificateSigningRequests(), key, name)
	if err != nil {
		return fmt.Errorf("failed to request signed certificate from the API server [%v]", err)
	}
	fmt.Printf("[csr] Received signed certificate from the API server")
	fmt.Println("[csr] Generating kubelet configuration")

	cfg.AuthInfos["kubelet"] = &clientcmdapi.AuthInfo{
		ClientKeyData:         key,
		ClientCertificateData: cert,
	}
	cfg.Contexts["kubelet"] = &clientcmdapi.Context{
		AuthInfo: "kubelet",
		Cluster:  cfg.Contexts[cfg.CurrentContext].Cluster,
	}
	cfg.CurrentContext = "kubelet"
	return nil
}
Example #5
0
// PerformTLSBootstrap executes a certificate signing request with the
// provided connection details.
func PerformTLSBootstrap(cfg *clientcmdapi.Config) error {
	hostName, err := os.Hostname()
	if err != nil {
		return err
	}
	name := types.NodeName(hostName)

	rc, err := clientcmd.NewDefaultClientConfig(*cfg, nil).ClientConfig()
	if err != nil {
		return err
	}
	c, err := clientset.NewForConfig(rc)
	if err != nil {
		return 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 fmt.Errorf("<node/csr> failed to generating private key [%v]", err)
	}
	cert, err := csr.RequestNodeCertificate(c.Certificates().CertificateSigningRequests(), key, name)
	if err != nil {
		return fmt.Errorf("<node/csr> failed to request signed certificate from the API server [%v]", err)
	}
	fmtCert, err := certutil.FormatBytesCert(cert)
	if err != nil {
		return fmt.Errorf("<node/csr> failed to format certificate [%v]", err)
	}
	fmt.Printf("<node/csr> received signed certificate from the API server:\n%s\n", fmtCert)
	fmt.Println("<node/csr> generating kubelet configuration")

	cfg.AuthInfos["kubelet"] = &clientcmdapi.AuthInfo{
		ClientKeyData:         key,
		ClientCertificateData: []byte(fmtCert),
	}
	cfg.Contexts["kubelet"] = &clientcmdapi.Context{
		AuthInfo: "kubelet",
		Cluster:  cfg.Contexts[cfg.CurrentContext].Cluster,
	}
	cfg.CurrentContext = "kubelet"
	return nil
}
Example #6
0
// bootstrapClientCert requests a client cert for kubelet if the kubeconfigPath file does not exist.
// The kubeconfig at bootstrapPath is used to request a client certificate from the API server.
// On success, a kubeconfig file referencing the generated key and obtained certificate is written to kubeconfigPath.
// The certificate and key file are stored in certDir.
func bootstrapClientCert(kubeconfigPath string, bootstrapPath string, certDir string, nodeName types.NodeName) error {
	// Short-circuit if the kubeconfig file already exists.
	// TODO: inspect the kubeconfig, ensure a rest client can be built from it, verify client cert expiration, etc.
	_, err := os.Stat(kubeconfigPath)
	if err == nil {
		glog.V(2).Infof("Kubeconfig %s exists, skipping bootstrap", kubeconfigPath)
		return nil
	}
	if !os.IsNotExist(err) {
		glog.Errorf("Error reading kubeconfig %s, skipping bootstrap: %v", kubeconfigPath, err)
		return err
	}

	glog.V(2).Info("Using bootstrap kubeconfig to generate TLS client cert, key and kubeconfig file")

	bootstrapClientConfig, err := loadRESTClientConfig(bootstrapPath)
	if err != nil {
		return fmt.Errorf("unable to load bootstrap kubeconfig: %v", err)
	}
	bootstrapClient, err := unversionedcertificates.NewForConfig(bootstrapClientConfig)
	if err != nil {
		return fmt.Errorf("unable to create certificates signing request client: %v", err)
	}

	success := false

	// Get the private key.
	keyPath, err := filepath.Abs(filepath.Join(certDir, defaultKubeletClientKeyFile))
	if err != nil {
		return fmt.Errorf("unable to build bootstrap key path: %v", err)
	}
	keyData, generatedKeyFile, err := loadOrGenerateKeyFile(keyPath)
	if err != nil {
		return err
	}
	if generatedKeyFile {
		defer func() {
			if !success {
				if err := os.Remove(keyPath); err != nil {
					glog.Warningf("Cannot clean up the key file %q: %v", keyPath, err)
				}
			}
		}()
	}

	// Get the cert.
	certPath, err := filepath.Abs(filepath.Join(certDir, defaultKubeletClientCertificateFile))
	if err != nil {
		return fmt.Errorf("unable to build bootstrap client cert path: %v", err)
	}
	certData, err := csr.RequestNodeCertificate(bootstrapClient.CertificateSigningRequests(), keyData, nodeName)
	if err != nil {
		return err
	}
	if err := certutil.WriteCert(certPath, certData); err != nil {
		return err
	}
	defer func() {
		if !success {
			if err := os.Remove(certPath); err != nil {
				glog.Warningf("Cannot clean up the cert file %q: %v", certPath, err)
			}
		}
	}()

	// Get the CA data from the bootstrap client config.
	caFile, caData := bootstrapClientConfig.CAFile, []byte{}
	if len(caFile) == 0 {
		caData = bootstrapClientConfig.CAData
	}

	// Build resulting kubeconfig.
	kubeconfigData := clientcmdapi.Config{
		// Define a cluster stanza based on the bootstrap kubeconfig.
		Clusters: map[string]*clientcmdapi.Cluster{"default-cluster": {
			Server:                   bootstrapClientConfig.Host,
			InsecureSkipTLSVerify:    bootstrapClientConfig.Insecure,
			CertificateAuthority:     caFile,
			CertificateAuthorityData: caData,
		}},
		// Define auth based on the obtained client cert.
		AuthInfos: map[string]*clientcmdapi.AuthInfo{"default-auth": {
			ClientCertificate: certPath,
			ClientKey:         keyPath,
		}},
		// Define a context that connects the auth info and cluster, and set it as the default
		Contexts: map[string]*clientcmdapi.Context{"default-context": {
			Cluster:   "default-cluster",
			AuthInfo:  "default-auth",
			Namespace: "default",
		}},
		CurrentContext: "default-context",
	}

	// Marshal to disk
	if err := clientcmd.WriteToFile(kubeconfigData, kubeconfigPath); err != nil {
		return err
	}

	success = true
	return nil
}