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ca-manager.go
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ca-manager.go
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/*
* This file is part of the KubeVirt project
*
* 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.
*
* Copyright 2019 Red Hat, Inc.
*
*/
package tls
import (
"crypto/x509"
"fmt"
"sync"
k8sv1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/cert"
"kubevirt.io/client-go/log"
"kubevirt.io/kubevirt/pkg/util"
"kubevirt.io/kubevirt/pkg/virt-operator/resource/generate/components"
)
type ClientCAManager interface {
GetCurrent() (*x509.CertPool, error)
GetCurrentRaw() ([]byte, error)
}
type manager struct {
store cache.Store
lock *sync.Mutex
lastRevision string
namespace string
name string
secretKey string
lastPool *x509.CertPool
lastRaw []byte
}
func NewKubernetesClientCAManager(configMapCache cache.Store) ClientCAManager {
return &manager{
store: configMapCache,
lock: &sync.Mutex{},
namespace: metav1.NamespaceSystem,
name: util.ExtensionAPIServerAuthenticationConfigMap,
secretKey: util.RequestHeaderClientCAFileKey,
lastRevision: "-1",
}
}
func NewCAManager(configMapCache cache.Store, namespace string, configMapName string) ClientCAManager {
return &manager{
store: configMapCache,
lock: &sync.Mutex{},
namespace: namespace,
name: configMapName,
secretKey: components.CABundleKey,
lastRevision: "-1",
}
}
func (m *manager) GetCurrentRaw() ([]byte, error) {
_, err := m.GetCurrent()
if err != nil {
return nil, err
}
return m.lastRaw, nil
}
func (m *manager) GetCurrent() (*x509.CertPool, error) {
m.lock.Lock()
defer m.lock.Unlock()
obj, exists, err := m.store.GetByKey(m.namespace + "/" + m.name)
if err != nil {
return nil, err
} else if !exists {
if m.lastPool != nil {
return m.lastPool, nil
}
return nil, fmt.Errorf("configmap %s not found. Unable to detect request header CA", m.name)
}
configMap := obj.(*k8sv1.ConfigMap)
// no change detected.
if m.lastRevision == configMap.ResourceVersion {
return m.lastPool, nil
}
log.DefaultLogger().Infof("CA update in configmap %s/%s detected. Updating from resource version %v to %v", m.namespace, m.name, m.lastRevision, configMap.ResourceVersion)
requestHeaderClientCA, ok := configMap.Data[m.secretKey]
if !ok {
return nil, fmt.Errorf("requestheader-client-ca-file not found in configmap %s/%s", m.namespace, m.name)
}
certs, err := cert.ParseCertsPEM([]byte(requestHeaderClientCA))
if err != nil {
return nil, err
}
pool := x509.NewCertPool()
for _, cert := range certs {
pool.AddCert(cert)
}
m.lastRevision = configMap.ResourceVersion
m.lastPool = pool
m.lastRaw = []byte(requestHeaderClientCA)
return pool, nil
}