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secrets_manager.go
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/
secrets_manager.go
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// Copyright (c) 2020 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 shootsecrets
import (
"context"
"fmt"
"reflect"
"sync"
gardencorev1alpha1helper "github.com/gardener/gardener/pkg/apis/core/v1alpha1/helper"
"github.com/gardener/gardener/pkg/operation/botanist/component/kubeapiserver"
"github.com/gardener/gardener/pkg/utils/infodata"
"github.com/gardener/gardener/pkg/utils/secrets"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// SecretConfigGeneratorFunc is a func used to generate secret configurations
type SecretConfigGeneratorFunc func(*secrets.BasicAuth, *secrets.StaticToken, map[string]*secrets.Certificate) ([]secrets.ConfigInterface, error)
// SecretsManager holds the configurations of all required shoot secrets that have to be preserved in the ShootState.
// It uses these configurations to generate new secret infodata and save it into the ShootState
// or create kubernetes secret objects from infodata available in the ShootState and deploy them.
type SecretsManager struct {
apiServerBasicAuthConfig *secrets.BasicAuthSecretConfig
staticTokenConfig *secrets.StaticTokenSecretConfig
certificateAuthorityConfigs map[string]*secrets.CertificateSecretConfig
secretConfigGenerator SecretConfigGeneratorFunc
apiServerBasicAuth *secrets.BasicAuth
certificateAuthorities map[string]*secrets.Certificate
existingSecrets map[string]*corev1.Secret
GardenerResourceDataList gardencorev1alpha1helper.GardenerResourceDataList
StaticToken *secrets.StaticToken
DeployedSecrets map[string]*corev1.Secret
}
// NewSecretsManager takes in a list of GardenerResourceData items, a static token secret config, a map of certificate authority configs,
// a function which can generate secret configurations and returns a new SecretsManager struct
func NewSecretsManager(
gardenerResourceDataList gardencorev1alpha1helper.GardenerResourceDataList,
staticTokenConfig *secrets.StaticTokenSecretConfig,
certificateAuthorityConfigs map[string]*secrets.CertificateSecretConfig,
secretConfigGenerator SecretConfigGeneratorFunc,
) *SecretsManager {
return &SecretsManager{
GardenerResourceDataList: gardenerResourceDataList,
staticTokenConfig: staticTokenConfig,
certificateAuthorityConfigs: certificateAuthorityConfigs,
secretConfigGenerator: secretConfigGenerator,
certificateAuthorities: make(map[string]*secrets.Certificate, len(certificateAuthorityConfigs)),
existingSecrets: map[string]*corev1.Secret{},
DeployedSecrets: map[string]*corev1.Secret{},
}
}
// WithExistingSecrets adds the provided map of existing secrets to the SecretsManager
func (s *SecretsManager) WithExistingSecrets(existingSecrets map[string]*corev1.Secret) *SecretsManager {
s.existingSecrets = existingSecrets
return s
}
// WithAPIServerBasicAuthConfig adds the provided basic auth secret configuration to the SecretsManager
func (s *SecretsManager) WithAPIServerBasicAuthConfig(config *secrets.BasicAuthSecretConfig) *SecretsManager {
s.apiServerBasicAuthConfig = config
return s
}
// Generate generates InfoData for all shoot secrets managed by gardener and adds it to the SecretManager's
// GardenerResourceData
func (s *SecretsManager) Generate() error {
if s.apiServerBasicAuthConfig != nil {
if err := s.generateInfoDataAndUpdateResourceList(s.apiServerBasicAuthConfig); err != nil {
return err
}
}
if err := s.generateStaticTokenAndUpdateResourceList(); err != nil {
return err
}
for _, caConfig := range s.certificateAuthorityConfigs {
if err := s.generateInfoDataAndUpdateResourceList(caConfig); err != nil {
return err
}
}
for name, caConfig := range s.certificateAuthorityConfigs {
cert, err := s.getInfoDataAndGenerateSecret(caConfig)
if err != nil {
return err
}
s.certificateAuthorities[name] = cert.(*secrets.Certificate)
}
secretConfigs, err := s.secretConfigGenerator(nil, nil, s.certificateAuthorities)
if err != nil {
return err
}
for _, config := range secretConfigs {
if err := s.generateInfoDataAndUpdateResourceList(config); err != nil {
return err
}
}
return nil
}
// Deploy gets InfoData for all shoot secrets managed by gardener from the SecretManager's GardenerResourceDataList
// and uses it to generate kubernetes secrets and deploy them in the provided namespace.
func (s *SecretsManager) Deploy(ctx context.Context, k8sClient client.Client, namespace string) error {
if s.apiServerBasicAuthConfig != nil {
if err := s.deployBasicAuthSecret(ctx, k8sClient, namespace); err != nil {
return err
}
}
if err := s.deployStaticToken(ctx, k8sClient, namespace); err != nil {
return err
}
for name, caConfig := range s.certificateAuthorityConfigs {
cert, err := s.getInfoDataAndGenerateSecret(caConfig)
if err != nil {
return err
}
s.certificateAuthorities[name] = cert.(*secrets.Certificate)
}
if err := s.deployCertificateAuthorities(ctx, k8sClient, namespace); err != nil {
return err
}
if s.secretConfigGenerator == nil {
return nil
}
secretConfigs, err := s.secretConfigGenerator(s.apiServerBasicAuth, s.StaticToken, s.certificateAuthorities)
if err != nil {
return err
}
deployedSecrets, err := secrets.GenerateClusterSecretsWithFunc(ctx, k8sClient, s.existingSecrets, secretConfigs, namespace, func(c secrets.ConfigInterface) (secrets.DataInterface, error) {
return s.getInfoDataAndGenerateSecret(c)
})
if err != nil {
return err
}
for name, secret := range deployedSecrets {
s.DeployedSecrets[name] = secret
}
return nil
}
func (s *SecretsManager) generateStaticTokenAndUpdateResourceList() error {
infoData, err := infodata.GetInfoData(s.GardenerResourceDataList, s.staticTokenConfig.Name)
if err != nil {
return err
}
if infoData == nil {
data, err := s.staticTokenConfig.GenerateInfoData()
if err != nil {
return err
}
return infodata.UpsertInfoData(&s.GardenerResourceDataList, s.staticTokenConfig.Name, data)
}
staticTokenInfoData, ok := infoData.(*secrets.StaticTokenInfoData)
if !ok {
return fmt.Errorf("could not convert InfoData entry %s to StaticTokenInfoData", s.staticTokenConfig.Name)
}
newStaticTokenConfig := secrets.StaticTokenSecretConfig{
Name: kubeapiserver.SecretNameStaticToken,
Tokens: make(map[string]secrets.TokenConfig),
}
var tokenConfigSet, tokenInfoDataSet = sets.NewString(), sets.NewString()
for name := range s.staticTokenConfig.Tokens {
tokenConfigSet.Insert(name)
}
for name := range staticTokenInfoData.Tokens {
tokenInfoDataSet.Insert(name)
}
newTokenKeys, outdatedTokenKeys := []string{}, []string{}
if diff := tokenConfigSet.Difference(tokenInfoDataSet); diff.Len() > 0 {
newTokenKeys = diff.UnsortedList()
} else if diff := tokenInfoDataSet.Difference(tokenConfigSet); diff.Len() > 0 {
outdatedTokenKeys = diff.UnsortedList()
} else {
return nil
}
switch {
case len(newTokenKeys) > 0:
for _, tokenKey := range newTokenKeys {
newStaticTokenConfig.Tokens[tokenKey] = s.staticTokenConfig.Tokens[tokenKey]
}
newStaticTokenInfoData, err := newStaticTokenConfig.GenerateInfoData()
if err != nil {
return err
}
staticTokenInfoData.Append(newStaticTokenInfoData.(*secrets.StaticTokenInfoData))
case len(outdatedTokenKeys) > 0:
staticTokenInfoData.RemoveTokens(outdatedTokenKeys...)
}
return infodata.UpsertInfoData(&s.GardenerResourceDataList, s.staticTokenConfig.Name, staticTokenInfoData)
}
func (s *SecretsManager) generateInfoDataAndUpdateResourceList(secretConfig secrets.ConfigInterface) error {
if s.GardenerResourceDataList.Get(secretConfig.GetName()) != nil {
return nil
}
data, err := secretConfig.GenerateInfoData()
if err != nil {
return err
}
return infodata.UpsertInfoData(&s.GardenerResourceDataList, secretConfig.GetName(), data)
}
func (s *SecretsManager) getInfoDataAndGenerateSecret(secretConfig secrets.ConfigInterface) (secrets.DataInterface, error) {
secretInfoData, err := infodata.GetInfoData(s.GardenerResourceDataList, secretConfig.GetName())
if err != nil {
return nil, err
}
if secretInfoData == nil {
return secretConfig.Generate()
}
return secretConfig.GenerateFromInfoData(secretInfoData)
}
// DeployBasicAuthSecret deploys the APIServer BasicAuth secret
func (s *SecretsManager) deployBasicAuthSecret(ctx context.Context, k8sClient client.Client, namespace string) error {
secretInterface, err := s.getInfoDataAndGenerateSecret(s.apiServerBasicAuthConfig)
if err != nil {
return err
}
s.apiServerBasicAuth = secretInterface.(*secrets.BasicAuth)
secret, err := s.deploySecret(ctx, k8sClient, namespace, s.apiServerBasicAuth, s.apiServerBasicAuth.Name)
if err != nil {
return err
}
s.DeployedSecrets[secret.Name] = secret
return nil
}
func (s *SecretsManager) deployStaticToken(ctx context.Context, k8sClient client.Client, namespace string) error {
secretInterface, err := s.getInfoDataAndGenerateSecret(s.staticTokenConfig)
if err != nil {
return err
}
s.StaticToken = secretInterface.(*secrets.StaticToken)
data := s.StaticToken.SecretData()
if secret, ok := s.existingSecrets[s.staticTokenConfig.Name]; ok {
if reflect.DeepEqual(data, secret.Data) {
s.DeployedSecrets[secret.Name] = secret
return nil
}
secret.Data = data
if err := k8sClient.Update(ctx, secret); err != nil {
return err
}
s.DeployedSecrets[secret.Name] = secret
return nil
}
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: s.staticTokenConfig.Name,
Namespace: namespace,
},
Type: corev1.SecretTypeOpaque,
Data: data,
}
if err := k8sClient.Create(ctx, secret); err != nil {
return err
}
s.DeployedSecrets[secret.Name] = secret
return nil
}
func (s *SecretsManager) deployCertificateAuthorities(ctx context.Context, k8sClient client.Client, namespace string) error {
type caOutput struct {
secret *corev1.Secret
err error
}
var (
wg sync.WaitGroup
results = make(chan *caOutput)
errorList = []error{}
)
for name, certificateAuthority := range s.certificateAuthorities {
wg.Add(1)
go func(c *secrets.Certificate, n string) {
defer wg.Done()
secret, err := s.deploySecret(ctx, k8sClient, namespace, c, n)
results <- &caOutput{secret, err}
}(certificateAuthority, name)
}
go func() {
wg.Wait()
close(results)
}()
for out := range results {
if out.err != nil {
errorList = append(errorList, out.err)
continue
}
s.DeployedSecrets[out.secret.Name] = out.secret
}
// Wait and check whether an error occurred during the parallel processing of the Secret creation.
if len(errorList) > 0 {
return fmt.Errorf("errors occurred during certificate authority generation: %+v", errorList)
}
return nil
}
func (s *SecretsManager) deploySecret(ctx context.Context, k8sClient client.Client, namespace string, secretInterface secrets.DataInterface, secretName string) (*corev1.Secret, error) {
if secret, ok := s.existingSecrets[secretName]; ok {
return secret, nil
}
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: secretName,
Namespace: namespace,
},
Type: corev1.SecretTypeOpaque,
Data: secretInterface.SecretData(),
}
if err := k8sClient.Create(ctx, secret); err != nil {
return nil, err
}
return secret, nil
}