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intermediate_ca.go
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/
intermediate_ca.go
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package generator
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/asn1"
"encoding/pem"
"errors"
"net"
"strings"
"time"
"github.com/cjlapao/common-go/helper"
"github.com/cjlapao/tls-certificate-generator-go/entities"
"github.com/cjlapao/tls-certificate-generator-go/installer"
)
type X509IntermediateCertificate struct {
Name string
PrivateKey *rsa.PrivateKey
Certificate *x509.Certificate
Configuration entities.CertificateConfig
IntermidiateCertificates []entities.RootCertificate
Pem []byte
Csr []byte
PrivateKeyPem []byte
}
func (intermediateCA *X509IntermediateCertificate) baseFileName() string {
baseFileName := strings.ReplaceAll(intermediateCA.Name, " ", "_")
if baseFileName == "" {
baseFileName = strings.ReplaceAll(intermediateCA.Configuration.CommonName, " ", "_")
}
return baseFileName
}
func (intermediateCA *X509IntermediateCertificate) CertificateFileName() string {
certificateFileName := "intermediateCA_" + intermediateCA.baseFileName() + ".crt"
return certificateFileName
}
func (intermediateCA *X509IntermediateCertificate) PrivateKeyFileName() string {
privateKeyFileName := "intermediateCA_" + intermediateCA.baseFileName() + ".key"
return privateKeyFileName
}
func (intermediateCA *X509IntermediateCertificate) CertificateRequestFileName() string {
certificateRequestFileName := "intermediateCA_" + intermediateCA.baseFileName() + ".csr"
return certificateRequestFileName
}
func (intermediateCA *X509IntermediateCertificate) Generate(rootCA *X509RootCertificate, config entities.CertificateConfig) (*x509.Certificate, []byte, *rsa.PrivateKey) {
logger.Debug("Starting to generate root certificate")
subject := pkix.Name{
Country: []string{config.Country},
Organization: []string{config.Organization},
OrganizationalUnit: []string{config.OrganizationalUnit},
Province: []string{config.State},
Locality: []string{config.City},
CommonName: config.CommonName,
}
if config.AdminEmailAddress != "" {
subject.ExtraNames = []pkix.AttributeTypeAndValue{
{
Type: oidEmailAddress,
Value: asn1.RawValue{
Tag: asn1.TagIA5String,
Bytes: []byte(config.AdminEmailAddress),
},
},
}
}
intermediateCertificateTemplate := x509.Certificate{
SerialNumber: generateSerialNumber(),
Subject: subject,
NotBefore: time.Now().Add(-10 * time.Second),
NotAfter: time.Now().AddDate(config.ExpiresInYears, 0, 0),
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
ExtKeyUsage: []x509.ExtKeyUsage{
x509.ExtKeyUsageServerAuth,
x509.ExtKeyUsageClientAuth,
},
IsCA: true,
MaxPathLen: 1,
MaxPathLenZero: false,
SignatureAlgorithm: config.SignatureAlgorithm.ToX509SignatureAlgorithm(),
DNSNames: config.FQDNs,
BasicConstraintsValid: true,
PolicyIdentifiers: []asn1.ObjectIdentifier{
policy4,
policy5,
policy6,
},
}
if config.FQDNs != nil && len(config.FQDNs) > 0 {
intermediateCertificateTemplate.DNSNames = config.FQDNs
}
if config.IpAddresses != nil && len(config.IpAddresses) > 0 {
for _, ip := range config.IpAddresses {
intermediateCertificateTemplate.IPAddresses = append(intermediateCertificateTemplate.IPAddresses, net.ParseIP(ip))
}
}
logger.Debug("Starting to generate private key")
priv, err := rsa.GenerateKey(rand.Reader, int(config.KeySize))
if err != nil {
panic(err)
}
subjectKeyId, err := generateSubjectKeyId(priv)
if err == nil {
intermediateCertificateTemplate.SubjectKeyId = subjectKeyId
intermediateCertificateTemplate.AuthorityKeyId = intermediateCertificateTemplate.SubjectKeyId
}
intermediateCertificate, intermediatePemCertificate := generateCertificate(&intermediateCertificateTemplate, rootCA.Certificate, &priv.PublicKey, rootCA.PrivateKey)
csr, err := generateCertificateRequest(intermediateCertificate, priv)
intermediateCA.PrivateKey = priv
intermediateCA.Certificate = intermediateCertificate
intermediateCA.Configuration = config
intermediateCA.Pem = intermediatePemCertificate
intermediateCA.Pem = append(intermediateCA.Pem, rootCA.Pem...)
intermediateCA.Csr = csr
intermediateCA.PrivateKeyPem = generatePemPrivateKey(priv)
return intermediateCertificate, intermediatePemCertificate, priv
}
func (intermediateCA *X509IntermediateCertificate) LoadFromFile() error {
return nil
}
func (intermediateCA *X509IntermediateCertificate) Parse(certificate string, privateKey string) error {
if certificate != "" {
certBlock, _ := pem.Decode([]byte(certificate))
if certBlock == nil {
err := errors.New("no valid certificate block found")
logger.Error("found error while parsing pem certificate block, err %v", err.Error())
return err
}
cert, err := x509.ParseCertificate(certBlock.Bytes)
if err != nil {
logger.Error("found error while parsing certificate block, err %v", err.Error())
return err
}
intermediateCA.Certificate = cert
intermediateCA.Pem = []byte(certificate)
}
if privateKey != "" {
privBlock, _ := pem.Decode([]byte(privateKey))
if privBlock == nil {
err := errors.New("no valid private key block found")
logger.Error("found error while parsing pem private key block, err %v", err.Error())
return err
}
priv, err := x509.ParsePKCS1PrivateKey(privBlock.Bytes)
if err != nil {
logger.Error("found error while parsing private key block, err %v", err.Error())
return err
}
intermediateCA.PrivateKey = priv
intermediateCA.PrivateKeyPem = []byte(privateKey)
}
return nil
}
func (intermediateCA *X509IntermediateCertificate) SaveToFile() error {
logger.Debug("Exporting Intermediate CA Certificate")
if helper.FileExists(intermediateCA.CertificateFileName()) {
helper.DeleteFile(intermediateCA.CertificateFileName())
}
helper.WriteToFile(string(intermediateCA.Pem), intermediateCA.CertificateFileName())
logger.Debug("Exporting Intermediate CA Private Key")
if helper.FileExists(intermediateCA.PrivateKeyFileName()) {
helper.DeleteFile(intermediateCA.PrivateKeyFileName())
}
helper.WriteToFile(string(intermediateCA.PrivateKeyPem), intermediateCA.PrivateKeyFileName())
logger.Debug("Exporting Intermediate CA CSR")
if helper.FileExists(intermediateCA.CertificateRequestFileName()) {
helper.DeleteFile(intermediateCA.CertificateRequestFileName())
}
helper.WriteToFile(string(intermediateCA.Csr), intermediateCA.CertificateRequestFileName())
return nil
}
func (intermediateCA *X509IntermediateCertificate) Install() error {
instalSvc := installer.Installer{}
instalSvc.InstallCertificate(intermediateCA.CertificateFileName(), installer.CAStore)
return nil
}