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tls_helpers.go
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/
tls_helpers.go
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package test
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/json"
"encoding/pem"
"fmt"
"math/big"
"os"
"time"
"github.com/alphagov/paas-elasticache-broker/broker"
)
func SetTLSConfigOptions(configFile string, certficiate []byte, key []byte) (string, error) {
data, err := os.ReadFile(configFile)
if err != nil {
return "", fmt.Errorf("Failed to read config file: %v", err)
}
var config broker.Config
err = json.Unmarshal(data, &config)
if err != nil {
return "", fmt.Errorf("Failed to unmarshal json file: %v", err)
}
config.TLS = &broker.TLSConfig{}
config.TLS.Certificate = string(certficiate)
config.TLS.PrivateKey = string(key)
data, err = json.Marshal(config)
if err != nil {
return "", fmt.Errorf("Failed to marshal json file: %v", err)
}
file, err := os.CreateTemp("", "config")
if err != nil {
return "", fmt.Errorf("Failed to create temp file: %v", err)
}
defer file.Close()
_, err = file.Write(data)
if err != nil {
return "", fmt.Errorf("Failed to write to temp file: %v", err)
}
return file.Name(), nil
}
func GenerateTestCert() ([]byte, []byte, []byte, error) {
// Generate a new RSA private key for the root CA
rootKey, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, nil, nil, fmt.Errorf("Failed to generate RSA key for root CA: %v", err)
}
// Generate a new self-signed X.509 certificate for the root CA
rootTemplate := x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
CommonName: "Root CA",
},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(100, 0, 0),
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
BasicConstraintsValid: true,
IsCA: true,
}
rootCertDER, err := x509.CreateCertificate(rand.Reader, &rootTemplate, &rootTemplate, &rootKey.PublicKey, rootKey)
if err != nil {
return nil, nil, nil, fmt.Errorf("Failed to create X.509 certificate for root CA: %v", err)
}
// Generate a new RSA private key for the intermediate CA
intermediateKey, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, nil, nil, fmt.Errorf("Failed to generate RSA key for intermediate CA: %v", err)
}
// Generate a new self-signed X.509 certificate for the intermediate CA
intermediateTemplate := x509.Certificate{
SerialNumber: big.NewInt(2),
Subject: pkix.Name{
CommonName: "Intermediate CA",
},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(100, 0, 0),
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
BasicConstraintsValid: true,
IsCA: true,
}
intermediateCertDER, err := x509.CreateCertificate(rand.Reader, &intermediateTemplate, &rootTemplate, &intermediateKey.PublicKey, rootKey)
if err != nil {
return nil, nil, nil, fmt.Errorf("Failed to create X.509 certificate for intermediate CA: %v", err)
}
// Generate a new RSA private key for the certificate
certKey, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, nil, nil, fmt.Errorf("Failed to generate RSA key for certificate: %v", err)
}
// Generate a new X.509 certificate signed by the intermediate CA
template := x509.Certificate{
SerialNumber: big.NewInt(3),
Subject: pkix.Name{
CommonName: "example.com",
},
DNSNames: []string{"example.com"},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(100, 0, 0),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
certDER, err := x509.CreateCertificate(rand.Reader, &template, &intermediateTemplate, &certKey.PublicKey, intermediateKey)
if err != nil {
return nil, nil, nil, fmt.Errorf("Failed to create X.509 certificate signed by intermediate CA: %v", err)
}
certPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certDER})
intermediatePEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: intermediateCertDER})
keyPEM := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(certKey)})
rootCAPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: rootCertDER})
certChainPEM := append(certPEM, intermediatePEM...)
return certChainPEM, keyPEM, rootCAPEM, nil
}