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test_util.go
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test_util.go
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// Copyright 2021 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package security
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"net"
"os"
"time"
)
// WriteFile write content to a temp file
func WriteFile(fileName string, content []byte) (path string, err error) {
cert, err := os.CreateTemp("", fileName)
if err != nil {
return "", err
}
_, err = cert.Write(content)
return cert.Name(), err
}
// NewServerCredential4Test return a Credential for testing
func NewServerCredential4Test(cn string) (*CA, *Credential, error) {
var caPath, certPath, keyPath string
ca, err := NewCA()
if err != nil {
return nil, nil, err
}
if caPath, err = WriteFile("ticdc-test-ca", ca.CAPEM); err != nil {
return nil, nil, err
}
certPEM, keyPEM, err := ca.GenerateCerts(cn)
if err != nil {
return nil, nil, err
}
if certPath, err = WriteFile("ticdc-test-cert", certPEM); err != nil {
return nil, nil, err
}
if keyPath, err = WriteFile("ticdc-test-key", keyPEM); err != nil {
return nil, nil, err
}
res := &Credential{
CAPath: caPath,
CertPath: certPath,
KeyPath: keyPath,
}
if cn != "" {
res.CertAllowedCN = append(res.CertAllowedCN, cn)
}
return ca, res, nil
}
// CA represents a certificate authority
type CA struct {
privateKey *rsa.PrivateKey
Cert *x509.Certificate
CAPEM []byte
}
// NewCA create a new CA
func NewCA() (*CA, error) {
caPrivKey, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, err
}
caCert := &x509.Certificate{
SerialNumber: big.NewInt(2019),
Subject: pkix.Name{
Organization: []string{"test"},
},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(10, 0, 0),
IsCA: true,
ExtKeyUsage: []x509.ExtKeyUsage{
x509.ExtKeyUsageClientAuth,
x509.ExtKeyUsageServerAuth,
},
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
BasicConstraintsValid: true,
}
// self-signed certificate
caBytes, err := x509.CreateCertificate(rand.Reader, caCert, caCert,
&caPrivKey.PublicKey, caPrivKey)
if err != nil {
return nil, err
}
caPem := new(bytes.Buffer)
err = pem.Encode(caPem, &pem.Block{
Type: "CERTIFICATE",
Bytes: caBytes,
})
if err != nil {
return nil, err
}
return &CA{
privateKey: caPrivKey,
Cert: caCert,
CAPEM: caPem.Bytes(),
}, err
}
// GetPrivKeyPEM returns the PEM contents of the private key.
func (ca *CA) GetPrivKeyPEM() ([]byte, error) {
caPrivKeyPEM := new(bytes.Buffer)
err := pem.Encode(caPrivKeyPEM, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(ca.privateKey),
})
if err != nil {
return nil, err
}
return caPrivKeyPEM.Bytes(), nil
}
// GenerateCerts returns the PEM contents of a CA certificate and some certificates
// and private keys per Common Name in commonNames.
// thanks to https://shaneutt.com/blog/golang-ca-and-signed-cert-go/.
func (ca *CA) GenerateCerts(commonName string) (certPEM, KeyPEM []byte, err error) {
certPrivKey, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return nil, nil, err
}
cert := &x509.Certificate{
SerialNumber: big.NewInt(1658),
Subject: pkix.Name{
Organization: []string{"test"},
CommonName: commonName,
},
IPAddresses: []net.IP{net.IPv4(127, 0, 0, 1), net.IPv6loopback},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(10, 0, 0),
SubjectKeyId: []byte{1, 2, 3, 4, 6},
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature,
}
// signing the certificate with CA
certBytes, err := x509.CreateCertificate(rand.Reader, cert, ca.Cert,
&certPrivKey.PublicKey, ca.privateKey)
if err != nil {
return nil, nil, err
}
certPEMBuffer := new(bytes.Buffer)
err = pem.Encode(certPEMBuffer, &pem.Block{
Type: "CERTIFICATE",
Bytes: certBytes,
})
if err != nil {
return nil, nil, err
}
keyPEMBuffer := new(bytes.Buffer)
err = pem.Encode(keyPEMBuffer, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(certPrivKey),
})
if err != nil {
return nil, nil, err
}
return certPEMBuffer.Bytes(), keyPEMBuffer.Bytes(), nil
}