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client.go
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client.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 conjur
import (
"context"
"fmt"
"strings"
"github.com/cyberark/conjur-api-go/conjurapi"
"github.com/cyberark/conjur-api-go/conjurapi/authn"
corev1 "k8s.io/api/core/v1"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
esv1beta1 "github.com/external-secrets/external-secrets/apis/externalsecrets/v1beta1"
esmeta "github.com/external-secrets/external-secrets/apis/meta/v1"
"github.com/external-secrets/external-secrets/pkg/provider/conjur/util"
"github.com/external-secrets/external-secrets/pkg/utils"
"github.com/external-secrets/external-secrets/pkg/utils/resolvers"
)
var (
errConjurClient = "cannot setup new Conjur client: %w"
errBadCertBundle = "caBundle failed to base64 decode: %w"
errBadServiceUser = "could not get Auth.Apikey.UserRef: %w"
errBadServiceAPIKey = "could not get Auth.Apikey.ApiKeyRef: %w"
errGetKubeSATokenRequest = "cannot request Kubernetes service account token for service account %q: %w"
errUnableToFetchCAProviderCM = "unable to fetch Server.CAProvider ConfigMap: %w"
errUnableToFetchCAProviderSecret = "unable to fetch Server.CAProvider Secret: %w"
errSecretKeyFmt = "cannot find secret data for key: %q"
)
// Client is a provider for Conjur.
type Client struct {
StoreKind string
kube client.Client
store esv1beta1.GenericStore
namespace string
corev1 typedcorev1.CoreV1Interface
clientAPI SecretsClientFactory
client SecretsClient
}
func (c *Client) GetConjurClient(ctx context.Context) (SecretsClient, error) {
// if the client is initialized already, return it
if c.client != nil {
return c.client, nil
}
prov, err := util.GetConjurProvider(c.store)
if err != nil {
return nil, err
}
cert, getCertErr := c.getCA(ctx, prov)
if getCertErr != nil {
return nil, getCertErr
}
config := conjurapi.Config{
ApplianceURL: prov.URL,
SSLCert: cert,
}
if prov.Auth.APIKey != nil {
config.Account = prov.Auth.APIKey.Account
conjUser, secErr := resolvers.SecretKeyRef(
ctx,
c.kube,
c.StoreKind,
c.namespace, prov.Auth.APIKey.UserRef)
if secErr != nil {
return nil, fmt.Errorf(errBadServiceUser, secErr)
}
conjAPIKey, secErr := resolvers.SecretKeyRef(
ctx,
c.kube,
c.StoreKind,
c.namespace,
prov.Auth.APIKey.APIKeyRef)
if secErr != nil {
return nil, fmt.Errorf(errBadServiceAPIKey, secErr)
}
conjur, newClientFromKeyError := c.clientAPI.NewClientFromKey(config,
authn.LoginPair{
Login: conjUser,
APIKey: conjAPIKey,
},
)
if newClientFromKeyError != nil {
return nil, fmt.Errorf(errConjurClient, newClientFromKeyError)
}
c.client = conjur
return conjur, nil
} else if prov.Auth.Jwt != nil {
config.Account = prov.Auth.Jwt.Account
conjur, clientFromJwtError := c.newClientFromJwt(ctx, config, prov.Auth.Jwt)
if clientFromJwtError != nil {
return nil, fmt.Errorf(errConjurClient, clientFromJwtError)
}
c.client = conjur
return conjur, nil
} else {
// Should not happen because validate func should catch this
return nil, fmt.Errorf("no authentication method provided")
}
}
// PushSecret will write a single secret into the provider.
func (c *Client) PushSecret(_ context.Context, _ *corev1.Secret, _ esv1beta1.PushSecretData) error {
// NOT IMPLEMENTED
return nil
}
func (c *Client) DeleteSecret(_ context.Context, _ esv1beta1.PushSecretRemoteRef) error {
// NOT IMPLEMENTED
return nil
}
func (c *Client) SecretExists(_ context.Context, _ esv1beta1.PushSecretRemoteRef) (bool, error) {
return false, fmt.Errorf("not implemented")
}
// Validate validates the provider.
func (c *Client) Validate() (esv1beta1.ValidationResult, error) {
return esv1beta1.ValidationResultReady, nil
}
// Close closes the provider.
func (c *Client) Close(_ context.Context) error {
return nil
}
// configMapKeyRef returns the value of a key in a ConfigMap.
func (c *Client) configMapKeyRef(ctx context.Context, cmRef *esmeta.SecretKeySelector) (string, error) {
configMap := &corev1.ConfigMap{}
ref := client.ObjectKey{
Namespace: c.namespace,
Name: cmRef.Name,
}
if (c.StoreKind == esv1beta1.ClusterSecretStoreKind) &&
(cmRef.Namespace != nil) {
ref.Namespace = *cmRef.Namespace
}
err := c.kube.Get(ctx, ref, configMap)
if err != nil {
return "", err
}
keyBytes, ok := configMap.Data[cmRef.Key]
if !ok {
return "", err
}
valueStr := strings.TrimSpace(keyBytes)
return valueStr, nil
}
// getCA try retrieve the CA bundle from the provider CABundle or from the CAProvider.
func (c *Client) getCA(ctx context.Context, provider *esv1beta1.ConjurProvider) (string, error) {
if provider.CAProvider != nil {
var ca string
var err error
switch provider.CAProvider.Type {
case esv1beta1.CAProviderTypeConfigMap:
keySelector := esmeta.SecretKeySelector{
Name: provider.CAProvider.Name,
Namespace: provider.CAProvider.Namespace,
Key: provider.CAProvider.Key,
}
ca, err = c.configMapKeyRef(ctx, &keySelector)
if err != nil {
return "", fmt.Errorf(errUnableToFetchCAProviderCM, err)
}
case esv1beta1.CAProviderTypeSecret:
keySelector := esmeta.SecretKeySelector{
Name: provider.CAProvider.Name,
Namespace: provider.CAProvider.Namespace,
Key: provider.CAProvider.Key,
}
ca, err = resolvers.SecretKeyRef(
ctx,
c.kube,
c.StoreKind,
c.namespace,
&keySelector)
if err != nil {
return "", fmt.Errorf(errUnableToFetchCAProviderSecret, err)
}
}
return ca, nil
}
certBytes, decodeErr := utils.Decode(esv1beta1.ExternalSecretDecodeBase64, []byte(provider.CABundle))
if decodeErr != nil {
return "", fmt.Errorf(errBadCertBundle, decodeErr)
}
return string(certBytes), nil
}