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secrets.go
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secrets.go
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// Copyright 2019 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package provider
import (
"context"
"encoding/base64"
"time"
"github.com/juju/errors"
core "k8s.io/api/core/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"github.com/juju/juju/caas/kubernetes/provider/proxy"
"github.com/juju/juju/caas/kubernetes/provider/resources"
"github.com/juju/juju/caas/kubernetes/provider/utils"
k8sannotations "github.com/juju/juju/core/annotations"
"github.com/juju/juju/core/secrets"
)
func processSecretData(in map[string]string) (_ map[string][]byte, err error) {
out := make(map[string][]byte)
for k, v := range in {
if out[k], err = base64.StdEncoding.DecodeString(v); err != nil {
return nil, errors.Trace(err)
}
}
return out, nil
}
// ensureOCIImageSecret ensures a secret exists for use with retrieving images from private registries.
func (k *kubernetesClient) ensureOCIImageSecret(
ctx context.Context,
name string,
labels map[string]string,
secretData []byte,
annotations k8sannotations.Annotation,
) (func(), error) {
newSecret := &core.Secret{
ObjectMeta: v1.ObjectMeta{
Name: name,
Namespace: k.namespace,
Labels: labels,
Annotations: annotations.ToMap()},
Type: core.SecretTypeDockerConfigJson,
Data: map[string][]byte{
core.DockerConfigJsonKey: secretData,
},
}
logger.Debugf("ensuring docker secret %q", name)
return k.ensureSecret(ctx, newSecret)
}
func (k *kubernetesClient) ensureSecret(ctx context.Context, sec *core.Secret) (func(), error) {
cleanUp := func() {}
out, err := k.createSecret(ctx, sec)
if err == nil {
logger.Debugf("secret %q created", out.GetName())
cleanUp = func() { _ = k.deleteSecret(ctx, out.GetName(), out.GetUID()) }
return cleanUp, nil
}
if !errors.Is(err, errors.AlreadyExists) {
return cleanUp, errors.Trace(err)
}
_, err = k.listSecrets(ctx, sec.GetLabels())
if err != nil {
if errors.Is(err, errors.NotFound) {
// sec.Name is already used for an existing secret.
return cleanUp, errors.AlreadyExistsf("secret %q", sec.GetName())
}
return cleanUp, errors.Trace(err)
}
err = k.updateSecret(ctx, sec)
logger.Debugf("updating secret %q", sec.GetName())
return cleanUp, errors.Trace(err)
}
// updateSecret updates a secret resource.
func (k *kubernetesClient) updateSecret(ctx context.Context, sec *core.Secret) error {
if k.namespace == "" {
return errNoNamespace
}
_, err := k.client().CoreV1().Secrets(k.namespace).Update(ctx, sec, v1.UpdateOptions{})
if k8serrors.IsNotFound(err) {
return errors.NotFoundf("secret %q", sec.GetName())
}
return errors.Trace(err)
}
// getSecret return a secret resource.
func (k *kubernetesClient) getSecret(ctx context.Context, secretName string) (*core.Secret, error) {
if k.namespace == "" {
return nil, errNoNamespace
}
secret, err := k.client().CoreV1().Secrets(k.namespace).Get(ctx, secretName, v1.GetOptions{})
if err != nil {
if k8serrors.IsNotFound(err) {
return nil, errors.NotFoundf("secret %q", secretName)
}
return nil, errors.Trace(err)
}
return secret, nil
}
// createSecret creates a secret resource.
func (k *kubernetesClient) createSecret(ctx context.Context, secret *core.Secret) (*core.Secret, error) {
if k.namespace == "" {
return nil, errNoNamespace
}
utils.PurifyResource(secret)
out, err := k.client().CoreV1().Secrets(k.namespace).Create(ctx, secret, v1.CreateOptions{})
if k8serrors.IsAlreadyExists(err) {
return nil, errors.AlreadyExistsf("secret %q", secret.GetName())
}
return out, errors.Trace(err)
}
// deleteSecret deletes a secret resource.
func (k *kubernetesClient) deleteSecret(ctx context.Context, secretName string, uid types.UID) error {
if k.namespace == "" {
return errNoNamespace
}
err := k.client().CoreV1().Secrets(k.namespace).Delete(ctx, secretName, utils.NewPreconditionDeleteOptions(uid))
if k8serrors.IsNotFound(err) {
return nil
}
return errors.Trace(err)
}
func (k *kubernetesClient) listSecrets(ctx context.Context, labels map[string]string) ([]core.Secret, error) {
if k.namespace == "" {
return nil, errNoNamespace
}
listOps := v1.ListOptions{
LabelSelector: utils.LabelsToSelector(labels).String(),
}
secList, err := k.client().CoreV1().Secrets(k.namespace).List(ctx, listOps)
if err != nil {
return nil, errors.Trace(err)
}
if len(secList.Items) == 0 {
return nil, errors.NotFoundf("secret with labels %v", labels)
}
return secList.Items, nil
}
var timeoutForSecretTokenGet = 10 * time.Second
// GetSecretToken returns the token content for the specified secret name.
func (k *kubernetesClient) GetSecretToken(ctx context.Context, name string) (string, error) {
ctx, cancel := context.WithTimeout(ctx, timeoutForSecretTokenGet)
defer cancel()
secret, err := proxy.FetchTokenReadySecret(
ctx, name, k.client().CoreV1().Secrets(k.namespace), k.clock,
)
if k8serrors.IsNotFound(err) {
return "", errors.NotFoundf("secret %q", name)
}
if err != nil {
return "", errors.Trace(err)
}
return string(secret.Data[core.ServiceAccountTokenKey]), nil
}
// GetJujuSecret implements SecretsStore.
func (k *kubernetesClient) GetJujuSecret(ctx context.Context, backendId string) (secrets.SecretValue, error) {
// backendId is the secret name.
secret, err := k.getSecret(ctx, backendId)
if k8serrors.IsForbidden(err) {
logger.Tracef("getting secret %q: %v", backendId, err)
return nil, errors.Unauthorizedf("cannot access %q", backendId)
}
if err != nil {
return nil, errors.Trace(err)
}
data := map[string]string{}
for k, v := range secret.Data {
data[k] = base64.StdEncoding.EncodeToString(v)
}
return secrets.NewSecretValue(data), nil
}
// SaveJujuSecret implements SecretsStore.
func (k *kubernetesClient) SaveJujuSecret(ctx context.Context, name string, value secrets.SecretValue) (_ string, err error) {
labels := utils.LabelsMerge(
utils.LabelsForModel(k.CurrentModel(), false),
utils.LabelsJuju)
in := &core.Secret{
ObjectMeta: v1.ObjectMeta{
Labels: labels,
Annotations: k.annotations,
},
Type: core.SecretTypeOpaque,
}
if in.StringData, err = value.Values(); err != nil {
return "", errors.Trace(err)
}
secret := resources.NewSecret(name, k.namespace, in)
if err = secret.Apply(ctx, k.client()); err != nil {
return "", errors.Trace(err)
}
return name, nil
}
// DeleteJujuSecret implements SecretsStore.
func (k *kubernetesClient) DeleteJujuSecret(ctx context.Context, backendId string) error {
// backendId is the secret name.
secret, err := k.getSecret(ctx, backendId)
if k8serrors.IsForbidden(err) {
logger.Tracef("deleting secret %q: %v", backendId, err)
return errors.Unauthorizedf("cannot access %q", backendId)
}
if err != nil {
return errors.Trace(err)
}
return resources.NewSecret(secret.Name, k.namespace, secret).Delete(ctx, k.client())
}