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secrets.go
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secrets.go
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// Copyright 2019-2022 The Liqo 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 webhookConfiguration
import (
"bytes"
"crypto/ed25519"
cryptorand "crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"math/rand"
"net"
"os"
"time"
"k8s.io/klog/v2"
)
// SecretsType is a struct that contains the secrets for a certificate.
type SecretsType struct {
caPEM *bytes.Buffer
serverCertPEM *bytes.Buffer
serverKeyPEM *bytes.Buffer
}
// ServiceNames is a struct that contains the names where the service is accessible.
type ServiceNames struct {
CommonName string
DNSNames []string
Addresses []net.IP
}
// NewSecrets creates a new secrets by self-signing a certificate.
func NewSecrets(name ServiceNames) (*SecretsType, error) {
secrets := &SecretsType{
caPEM: new(bytes.Buffer),
serverCertPEM: new(bytes.Buffer),
serverKeyPEM: new(bytes.Buffer),
}
klog.Info("creating CA")
// CA config
ca := &x509.Certificate{
SerialNumber: big.NewInt(rand.Int63()),
Subject: pkix.Name{
Organization: []string{"liqo.io"},
},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(1, 0, 0),
IsCA: true,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
BasicConstraintsValid: true,
}
// CA private key
caPublicKey, caPrivKey, err := ed25519.GenerateKey(cryptorand.Reader)
if err != nil {
return nil, err
}
klog.Info("self-signing CA")
// Self signed CA certificate
caBytes, err := x509.CreateCertificate(cryptorand.Reader, ca, ca, caPublicKey, caPrivKey)
if err != nil {
return nil, err
}
klog.Info("creating server certificate")
// server cert config
cert := &x509.Certificate{
DNSNames: name.DNSNames,
IPAddresses: name.Addresses,
SerialNumber: big.NewInt(1658),
Subject: pkix.Name{
CommonName: name.CommonName,
Organization: []string{"liqo.io"},
},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(1, 0, 0),
SubjectKeyId: []byte{1, 2, 3, 4, 6},
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature,
}
// server private key
serverPublicKey, serverPrivKey, err := ed25519.GenerateKey(cryptorand.Reader)
if err != nil {
return nil, err
}
klog.Info("signing server certificate with CA")
// sign the server cert
serverCertBytes, err := x509.CreateCertificate(cryptorand.Reader, cert, ca, serverPublicKey, caPrivKey)
if err != nil {
return nil, err
}
klog.Info("encoding CA")
// PEM encode CA cert
if err = pem.Encode(secrets.caPEM, &pem.Block{
Type: "CERTIFICATE",
Bytes: caBytes,
}); err != nil {
return nil, err
}
klog.Info("encoding server cert")
// PEM encode the server cert and key
if err = pem.Encode(secrets.serverCertPEM, &pem.Block{
Type: "CERTIFICATE",
Bytes: serverCertBytes,
}); err != nil {
return nil, err
}
klog.Info("encoding server key")
keyBytes, err := x509.MarshalPKCS8PrivateKey(serverPrivKey)
if err != nil {
klog.Error("Failed to marshal private key: %w", err)
return nil, err
}
// PEM encode the server and key
if err = pem.Encode(secrets.serverKeyPEM, &pem.Block{Type: "PRIVATE KEY", Bytes: keyBytes}); err != nil {
return nil, err
}
return secrets, nil
}
// WriteFiles writes the secrets to the specified files.
func (s *SecretsType) WriteFiles(certFile, keyFile string) error {
err := WriteFile(certFile, s.serverCertPEM)
if err != nil {
return err
}
err = WriteFile(keyFile, s.serverKeyPEM)
if err != nil {
return err
}
return nil
}
// WriteFile writes data in the file at the given path.
func WriteFile(filepath string, sCert *bytes.Buffer) error {
f, err := os.Create(filepath)
if err != nil {
return err
}
defer f.Close()
_, err = f.Write(sCert.Bytes())
if err != nil {
return err
}
return nil
}