/
client.go
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/
client.go
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// Copyright 2018 Istio Authors
//
// 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 caclient
import (
"encoding/base64"
"fmt"
"strings"
"time"
"istio.io/istio/pkg/kube"
"istio.io/istio/pkg/log"
"istio.io/istio/security/pkg/k8s/configmap"
caClientInterface "istio.io/istio/security/pkg/nodeagent/caclient/interface"
citadel "istio.io/istio/security/pkg/nodeagent/caclient/providers/citadel"
gca "istio.io/istio/security/pkg/nodeagent/caclient/providers/google"
vault "istio.io/istio/security/pkg/nodeagent/caclient/providers/vault"
)
const (
googleCAName = "GoogleCA"
citadelName = "Citadel"
vaultCAName = "VaultCA"
ns = "istio-system"
retryInterval = time.Second * 2
maxRetries = 100
)
type configMap interface {
GetCATLSRootCert() (string, error)
}
// NewCAClient create an CA client.
func NewCAClient(endpoint, CAProviderName string, tlsFlag bool, tlsRootCert []byte, vaultAddr, vaultRole,
vaultAuthPath, vaultSignCsrPath string) (caClientInterface.Client, error) {
switch CAProviderName {
case googleCAName:
return gca.NewGoogleCAClient(endpoint, tlsFlag)
case vaultCAName:
return vault.NewVaultClient(tlsFlag, tlsRootCert, vaultAddr, vaultRole, vaultAuthPath, vaultSignCsrPath)
case citadelName:
cs, err := kube.CreateClientset("", "")
if err != nil {
return nil, fmt.Errorf("could not create k8s clientset: %v", err)
}
controller := configmap.NewController(ns, cs.CoreV1())
rootCert, err := getCATLSRootCertFromConfigMap(controller, retryInterval, maxRetries)
if err != nil {
return nil, err
}
return citadel.NewCitadelClient(endpoint, tlsFlag, rootCert)
default:
return nil, fmt.Errorf(
"CA provider %q isn't supported. Currently Istio supports %q", CAProviderName, strings.Join([]string{googleCAName, citadelName, vaultCAName}, ","))
}
}
func getCATLSRootCertFromConfigMap(controller configMap, interval time.Duration, max int) ([]byte, error) {
cert := ""
var err error
// Keep retrying until the root cert is fetched or the number of retries is exhausted.
for i := 0; i < max+1; i++ {
cert, err = controller.GetCATLSRootCert()
if err == nil {
break
}
time.Sleep(retryInterval)
log.Infof("unalbe to fetch CA TLS root cert: %v, retry in %v", err, interval)
}
if cert == "" {
return nil, fmt.Errorf("exhausted all the retries (%d) to fetch the CA TLS root cert", max)
}
certDecoded, err := base64.StdEncoding.DecodeString(cert)
if err != nil {
return nil, fmt.Errorf("cannot decode the CA TLS root cert: %v", err)
}
return certDecoded, nil
}