/
control_plane.go
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/
control_plane.go
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// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 secrets
import (
"fmt"
"github.com/gardener/gardener/pkg/utils"
"github.com/gardener/gardener/pkg/utils/infodata"
)
const (
// DataKeyKubeconfig is the key in a secret data holding the kubeconfig.
DataKeyKubeconfig = "kubeconfig"
)
// ControlPlaneSecretConfig is a struct which inherits from CertificateSecretConfig and is extended with a couple of additional
// properties. A control plane secret will always contain a server/client certificate and optionally a kubeconfig.
type ControlPlaneSecretConfig struct {
*CertificateSecretConfig
BasicAuth *BasicAuth
Token *Token
KubeConfigRequest *KubeConfigRequest
}
// KubeConfigRequest is a struct which holds information about a Kubeconfig to be generated.
type KubeConfigRequest struct {
ClusterName string
APIServerURL string
}
// ControlPlane contains the certificate, and optionally the basic auth. information as well as a Kubeconfig.
type ControlPlane struct {
Name string
Certificate *Certificate
BasicAuth *BasicAuth
Token *Token
Kubeconfig []byte
}
// GetName returns the name of the secret.
func (s *ControlPlaneSecretConfig) GetName() string {
return s.CertificateSecretConfig.Name
}
// Generate implements ConfigInterface.
func (s *ControlPlaneSecretConfig) Generate() (Interface, error) {
return s.GenerateControlPlane()
}
// GenerateInfoData implements ConfigInterface
func (s *ControlPlaneSecretConfig) GenerateInfoData() (infodata.InfoData, error) {
cert, err := s.CertificateSecretConfig.GenerateCertificate()
if err != nil {
return nil, err
}
if len(cert.PrivateKeyPEM) == 0 && len(cert.CertificatePEM) == 0 {
return nil, nil
}
return NewCertificateInfoData(cert.PrivateKeyPEM, cert.CertificatePEM), nil
}
// GenerateFromInfoData implements ConfigInterface
func (s *ControlPlaneSecretConfig) GenerateFromInfoData(infoData infodata.InfoData) (Interface, error) {
data, ok := infoData.(*CertificateInfoData)
if !ok {
return nil, fmt.Errorf("could not convert InfoData entry %s to CertificateInfoData", s.Name)
}
certificate := &Certificate{
Name: s.Name,
CA: s.SigningCA,
PrivateKeyPEM: data.PrivateKey,
CertificatePEM: data.Certificate,
}
controlPlane := &ControlPlane{
Name: s.Name,
Certificate: certificate,
BasicAuth: s.BasicAuth,
Token: s.Token,
}
if s.KubeConfigRequest != nil {
kubeconfig, err := generateKubeconfig(s, certificate)
if err != nil {
return nil, err
}
controlPlane.Kubeconfig = kubeconfig
}
return controlPlane, nil
}
// LoadFromSecretData implements infodata.Loader
func (s *ControlPlaneSecretConfig) LoadFromSecretData(secretData map[string][]byte) (infodata.InfoData, error) {
privateKeyPEM := secretData[fmt.Sprintf("%s.key", s.Name)]
certificatePEM := secretData[fmt.Sprintf("%s.crt", s.Name)]
return NewCertificateInfoData(privateKeyPEM, certificatePEM), nil
}
// GenerateControlPlane computes a secret for a control plane component of the clusters managed by Gardener.
// It may include a Kubeconfig.
func (s *ControlPlaneSecretConfig) GenerateControlPlane() (*ControlPlane, error) {
certificate, err := s.CertificateSecretConfig.GenerateCertificate()
if err != nil {
return nil, err
}
controlPlane := &ControlPlane{
Name: s.Name,
Certificate: certificate,
BasicAuth: s.BasicAuth,
Token: s.Token,
}
if s.KubeConfigRequest != nil {
kubeconfig, err := generateKubeconfig(s, certificate)
if err != nil {
return nil, err
}
controlPlane.Kubeconfig = kubeconfig
}
return controlPlane, nil
}
// SecretData computes the data map which can be used in a Kubernetes secret.
func (c *ControlPlane) SecretData() map[string][]byte {
data := map[string][]byte{
DataKeyCertificateCA: c.Certificate.CA.CertificatePEM,
}
if c.Certificate.CertificatePEM != nil && c.Certificate.PrivateKeyPEM != nil {
data[fmt.Sprintf("%s.key", c.Name)] = c.Certificate.PrivateKeyPEM
data[fmt.Sprintf("%s.crt", c.Name)] = c.Certificate.CertificatePEM
}
if c.BasicAuth != nil {
data[DataKeyUserName] = []byte(c.BasicAuth.Username)
data[DataKeyPassword] = []byte(c.BasicAuth.Password)
}
if c.Token != nil {
data[DataKeyToken] = []byte(c.Token.Token)
}
if c.Kubeconfig != nil {
data[DataKeyKubeconfig] = c.Kubeconfig
}
return data
}
// generateKubeconfig generates a Kubernetes Kubeconfig for communicating with the kube-apiserver by using
// a client certificate. If <basicAuthUser> and <basicAuthPass> are non-empty string, a second user object
// containing the Basic Authentication credentials is added to the Kubeconfig.
func generateKubeconfig(secret *ControlPlaneSecretConfig, certificate *Certificate) ([]byte, error) {
values := map[string]interface{}{
"APIServerURL": secret.KubeConfigRequest.APIServerURL,
"CACertificate": utils.EncodeBase64(certificate.CA.CertificatePEM),
"ClusterName": secret.KubeConfigRequest.ClusterName,
}
if certificate.CertificatePEM != nil && certificate.PrivateKeyPEM != nil {
values["ClientCertificate"] = utils.EncodeBase64(certificate.CertificatePEM)
values["ClientKey"] = utils.EncodeBase64(certificate.PrivateKeyPEM)
}
if secret.BasicAuth != nil {
values["BasicAuthUsername"] = secret.BasicAuth.Username
values["BasicAuthPassword"] = secret.BasicAuth.Password
}
if secret.Token != nil {
values["Token"] = secret.Token.Token
}
return utils.RenderLocalTemplate(kubeconfigTemplate, values)
}
const kubeconfigTemplate = `---
apiVersion: v1
kind: Config
current-context: {{ .ClusterName }}
clusters:
- name: {{ .ClusterName }}
cluster:
certificate-authority-data: {{ .CACertificate }}
server: https://{{ .APIServerURL }}
contexts:
- name: {{ .ClusterName }}
context:
cluster: {{ .ClusterName }}
{{- if and .ClientCertificate .ClientKey }}
user: {{ .ClusterName }}
{{- else if .Token }}
user: {{ .ClusterName }}-token
{{- else if and .BasicAuthUsername .BasicAuthPassword }}
user: {{ .ClusterName }}-basic-auth
{{- end }}
users:
{{- if and .ClientCertificate .ClientKey }}
- name: {{ .ClusterName }}
user:
client-certificate-data: {{ .ClientCertificate }}
client-key-data: {{ .ClientKey }}
{{- end }}
{{- if .Token }}
- name: {{ .ClusterName }}-token
user:
token: {{ .Token }}
{{- end }}
{{- if and .BasicAuthUsername .BasicAuthPassword }}
- name: {{ .ClusterName }}-basic-auth
user:
username: {{ .BasicAuthUsername }}
password: {{ .BasicAuthPassword }}
{{- end }}`