// 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
}
// 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
}
// 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
}
