forked from kubernetes/dashboard
/
creator.go
168 lines (142 loc) · 5.05 KB
/
creator.go
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// Copyright 2017 The Kubernetes 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 ecdsa
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"io/ioutil"
"log"
"math/big"
"net"
"os"
certapi "github.com/kubernetes/dashboard/src/app/backend/cert/api"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// Implements certificate Creator interface. See Creator for more information.
type ecdsaCreator struct {
keyFile string
certFile string
curve elliptic.Curve
}
// GenerateKey implements certificate Creator interface. See Creator for more information.
func (self *ecdsaCreator) GenerateKey() interface{} {
key, err := ecdsa.GenerateKey(self.curve, rand.Reader)
if err != nil {
log.Fatalf("[ECDSAManager] Failed to generate certificate key: %s", err)
}
return key
}
// GenerateCertificate implements certificate Creator interface. See Creator for more information.
func (self *ecdsaCreator) GenerateCertificate(key interface{}) []byte {
ecdsaKey := self.getKey(key)
pod := self.getDashboardPod()
podDomainName := pod.Name + "." + pod.Namespace
template := x509.Certificate{
SerialNumber: self.generateSerialNumber(),
Subject: pkix.Name{CommonName: podDomainName},
Issuer: pkix.Name{CommonName: podDomainName},
DNSNames: []string{podDomainName},
}
if len(pod.Status.PodIP) > 0 {
template.IPAddresses = []net.IP{net.ParseIP(pod.Status.PodIP)}
}
certBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &ecdsaKey.PublicKey, ecdsaKey)
if err != nil {
log.Fatalf("[ECDSAManager] Failed to create certificate: %s", err)
}
return certBytes
}
// StoreCertificates implements certificate Creator interface. See Creator for more information.
func (self *ecdsaCreator) StoreCertificates(path string, key interface{}, certBytes []byte) {
keyPEM, certPEM, err := self.KeyCertPEMBytes(key, certBytes)
if err != nil {
log.Fatalf("[ECDSAManager] Failed to marshal cert/key pair: %v", err)
}
if err := ioutil.WriteFile(path+string(os.PathSeparator)+self.GetCertFileName(), certPEM, os.FileMode(0644)); err != nil {
log.Fatalf("[ECDSAManager] Failed to open %s for writing: %s", self.GetCertFileName(), err)
}
if err := ioutil.WriteFile(path+string(os.PathSeparator)+self.GetKeyFileName(), keyPEM, os.FileMode(0600)); err != nil {
log.Fatalf("[ECDSAManager] Failed to open %s for writing: %s", self.GetKeyFileName(), err)
}
}
func (self *ecdsaCreator) KeyCertPEMBytes(key interface{}, certBytes []byte) ([]byte, []byte, error) {
marshaledKey, err := x509.MarshalECPrivateKey(self.getKey(key))
if err != nil {
return nil, nil, err
}
keyPEM := pem.EncodeToMemory(&pem.Block{Type: "EC PRIVATE KEY", Bytes: marshaledKey})
certPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certBytes})
return keyPEM, certPEM, nil
}
// GetKeyFileName implements certificate Creator interface. See Creator for more information.
func (self *ecdsaCreator) GetKeyFileName() string {
return self.keyFile
}
// GetCertFileName implements certificate Creator interface. See Creator for more information.
func (self *ecdsaCreator) GetCertFileName() string {
return self.certFile
}
func (self *ecdsaCreator) getKey(key interface{}) *ecdsa.PrivateKey {
ecdsaKey, ok := key.(*ecdsa.PrivateKey)
if !ok {
log.Fatal("[ECDSAManager] Key should be an instance of *ecdsa.PrivateKey")
}
return ecdsaKey
}
func (self *ecdsaCreator) generateSerialNumber() *big.Int {
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
log.Fatalf("[ECDSAManager] Failed to generate serial number: %s", err)
}
return serialNumber
}
func (self *ecdsaCreator) getDashboardPod() *corev1.Pod {
// These variables are populated by kubernetes downward API when using in-cluster config
podName := os.Getenv("POD_NAME")
podNamespace := os.Getenv("POD_NAMESPACE")
podIP := os.Getenv("POD_IP")
return &corev1.Pod{
ObjectMeta: metav1.ObjectMeta{
Name: podName,
Namespace: podNamespace,
},
Status: corev1.PodStatus{
PodIP: podIP,
},
}
}
func (self *ecdsaCreator) init() {
if len(self.certFile) == 0 {
self.certFile = certapi.DashboardCertName
}
if len(self.keyFile) == 0 {
self.keyFile = certapi.DashboardKeyName
}
}
// NewECDSACreator creates ECDSACreator instance.
func NewECDSACreator(keyFile, certFile string, curve elliptic.Curve) certapi.Creator {
creator := &ecdsaCreator{
curve: curve,
keyFile: keyFile,
certFile: certFile,
}
creator.init()
return creator
}