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provider.go
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provider.go
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/*
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 common
import (
"context"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"sync"
"time"
"github.com/go-logr/logr"
"github.com/yandex-cloud/go-sdk/iamkey"
kclient "sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
esv1beta1 "github.com/external-secrets/external-secrets/apis/externalsecrets/v1beta1"
esmeta "github.com/external-secrets/external-secrets/apis/meta/v1"
clock2 "github.com/external-secrets/external-secrets/pkg/provider/yandex/common/clock"
"github.com/external-secrets/external-secrets/pkg/utils/resolvers"
)
const maxSecretsClientLifetime = 5 * time.Minute // supposed SecretsClient lifetime is quite short
// https://github.com/external-secrets/external-secrets/issues/644
var _ esv1beta1.Provider = &YandexCloudProvider{}
// Implementation of v1beta1.Provider.
type YandexCloudProvider struct {
logger logr.Logger
clock clock2.Clock
adaptInputFunc AdaptInputFunc
newSecretGetterFunc NewSecretGetterFunc
newIamTokenFunc NewIamTokenFunc
secretGetteMap map[string]SecretGetter // apiEndpoint -> SecretGetter
secretGetterMapMutex sync.Mutex
iamTokenMap map[iamTokenKey]*IamToken
iamTokenMapMutex sync.Mutex
}
type iamTokenKey struct {
authorizedKeyID string
serviceAccountID string
privateKeyHash string
}
func InitYandexCloudProvider(
logger logr.Logger,
clock clock2.Clock,
adaptInputFunc AdaptInputFunc,
newSecretGetterFunc NewSecretGetterFunc,
newIamTokenFunc NewIamTokenFunc,
iamTokenCleanupDelay time.Duration,
) *YandexCloudProvider {
provider := &YandexCloudProvider{
logger: logger,
clock: clock,
adaptInputFunc: adaptInputFunc,
newSecretGetterFunc: newSecretGetterFunc,
newIamTokenFunc: newIamTokenFunc,
secretGetteMap: make(map[string]SecretGetter),
iamTokenMap: make(map[iamTokenKey]*IamToken),
}
if iamTokenCleanupDelay > 0 {
go func() {
for {
time.Sleep(iamTokenCleanupDelay)
provider.CleanUpIamTokenMap()
}
}()
}
return provider
}
type NewSecretSetterFunc func()
type AdaptInputFunc func(store esv1beta1.GenericStore) (*SecretsClientInput, error)
type NewSecretGetterFunc func(ctx context.Context, apiEndpoint string, authorizedKey *iamkey.Key, caCertificate []byte) (SecretGetter, error)
type NewIamTokenFunc func(ctx context.Context, apiEndpoint string, authorizedKey *iamkey.Key, caCertificate []byte) (*IamToken, error)
type IamToken struct {
Token string
ExpiresAt time.Time
}
type SecretsClientInput struct {
APIEndpoint string
AuthorizedKey esmeta.SecretKeySelector
CACertificate *esmeta.SecretKeySelector
}
func (p *YandexCloudProvider) Capabilities() esv1beta1.SecretStoreCapabilities {
return esv1beta1.SecretStoreReadOnly
}
// NewClient constructs a Yandex.Cloud Provider.
func (p *YandexCloudProvider) NewClient(ctx context.Context, store esv1beta1.GenericStore, kube kclient.Client, namespace string) (esv1beta1.SecretsClient, error) {
input, err := p.adaptInputFunc(store)
if err != nil {
return nil, err
}
key, err := resolvers.SecretKeyRef(
ctx,
kube,
store.GetKind(),
namespace,
&input.AuthorizedKey,
)
if err != nil {
return nil, err
}
var authorizedKey iamkey.Key
err = json.Unmarshal([]byte(key), &authorizedKey)
if err != nil {
return nil, fmt.Errorf("unable to unmarshal authorized key: %w", err)
}
var caCertificateData []byte
if input.CACertificate != nil {
caCert, err := resolvers.SecretKeyRef(
ctx,
kube,
store.GetKind(),
namespace,
input.CACertificate,
)
if err != nil {
return nil, err
}
caCertificateData = []byte(caCert)
}
secretGetter, err := p.getOrCreateSecretGetter(ctx, input.APIEndpoint, &authorizedKey, caCertificateData)
if err != nil {
return nil, fmt.Errorf("failed to create Yandex.Cloud client: %w", err)
}
iamToken, err := p.getOrCreateIamToken(ctx, input.APIEndpoint, &authorizedKey, caCertificateData)
if err != nil {
return nil, fmt.Errorf("failed to create IAM token: %w", err)
}
return &yandexCloudSecretsClient{secretGetter, nil, iamToken.Token}, nil
}
func (p *YandexCloudProvider) getOrCreateSecretGetter(ctx context.Context, apiEndpoint string, authorizedKey *iamkey.Key, caCertificate []byte) (SecretGetter, error) {
p.secretGetterMapMutex.Lock()
defer p.secretGetterMapMutex.Unlock()
if _, ok := p.secretGetteMap[apiEndpoint]; !ok {
p.logger.Info("creating SecretGetter", "apiEndpoint", apiEndpoint)
secretGetter, err := p.newSecretGetterFunc(ctx, apiEndpoint, authorizedKey, caCertificate)
if err != nil {
return nil, err
}
p.secretGetteMap[apiEndpoint] = secretGetter
}
return p.secretGetteMap[apiEndpoint], nil
}
func (p *YandexCloudProvider) getOrCreateIamToken(ctx context.Context, apiEndpoint string, authorizedKey *iamkey.Key, caCertificate []byte) (*IamToken, error) {
p.iamTokenMapMutex.Lock()
defer p.iamTokenMapMutex.Unlock()
iamTokenKey := buildIamTokenKey(authorizedKey)
if iamToken, ok := p.iamTokenMap[iamTokenKey]; !ok || !p.isIamTokenUsable(iamToken) {
p.logger.Info("creating IAM token", "authorizedKeyId", authorizedKey.Id)
iamToken, err := p.newIamTokenFunc(ctx, apiEndpoint, authorizedKey, caCertificate)
if err != nil {
return nil, err
}
p.logger.Info("created IAM token", "authorizedKeyId", authorizedKey.Id, "expiresAt", iamToken.ExpiresAt)
p.iamTokenMap[iamTokenKey] = iamToken
}
return p.iamTokenMap[iamTokenKey], nil
}
func (p *YandexCloudProvider) isIamTokenUsable(iamToken *IamToken) bool {
now := p.clock.CurrentTime()
return now.Add(maxSecretsClientLifetime).Before(iamToken.ExpiresAt)
}
func buildIamTokenKey(authorizedKey *iamkey.Key) iamTokenKey {
privateKeyHash := sha256.Sum256([]byte(authorizedKey.PrivateKey))
return iamTokenKey{
authorizedKey.GetId(),
authorizedKey.GetServiceAccountId(),
hex.EncodeToString(privateKeyHash[:]),
}
}
// Used for testing.
func (p *YandexCloudProvider) IsIamTokenCached(authorizedKey *iamkey.Key) bool {
p.iamTokenMapMutex.Lock()
defer p.iamTokenMapMutex.Unlock()
_, ok := p.iamTokenMap[buildIamTokenKey(authorizedKey)]
return ok
}
func (p *YandexCloudProvider) CleanUpIamTokenMap() {
p.iamTokenMapMutex.Lock()
defer p.iamTokenMapMutex.Unlock()
for key, value := range p.iamTokenMap {
if p.clock.CurrentTime().After(value.ExpiresAt) {
p.logger.Info("deleting IAM token", "authorizedKeyId", key.authorizedKeyID)
delete(p.iamTokenMap, key)
}
}
}
func (p *YandexCloudProvider) ValidateStore(store esv1beta1.GenericStore) (admission.Warnings, error) {
_, err := p.adaptInputFunc(store) // adaptInputFunc validates the input store
if err != nil {
return nil, err
}
return nil, nil
}