转到:如何将扩展名(subjectAltName)添加到x509.Certificate? [英] Go: How do I add an extension (subjectAltName) to a x509.Certificate?
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问题描述
我正在创建CA证书.而且我想给subjectAltName扩展名添加一些值,例如email或crl或公共证书位置等.
I'm creating a CA cert. And I'd like to add the subjectAltName extension with some values like email or crl or public cert location and so on.
package main
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/asn1"
"encoding/pem"
"fmt"
"math/big"
"os"
"time"
//"net"
//"strconv"
)
func main() {
template := x509.Certificate{}
template.Subject = pkix.Name{
Organization: []string{"domain.tld", "My Name"},
StreetAddress: []string{"Whatever. 123"},
PostalCode: []string{"12345"},
Province: []string{"Redneckville"},
Locality: []string{"Woods"},
Country: []string{"US"},
CommonName: "CA domain my name",
}
template.NotBefore = time.Now()
template.NotAfter = template.NotBefore.Add(87658 * time.Hour)
template.KeyUsage = x509.KeyUsageCertSign | x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCRLSign
template.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth}
template.IsCA = true
template.BasicConstraintsValid = true
extSubjectAltName := pkix.Extension{}
extSubjectAltName.Id = asn1.ObjectIdentifier{2, 5, 29, 17}
extSubjectAltName.Critical = false
var e error
extSubjectAltName.Value, e = asn1.Marshal([]string{`email:mail@domain.tld`, `URI:http://ca.domain.tld/`})
if e != nil {
fmt.Println(e.Error())
return
}
template.Extensions = []pkix.Extension{extSubjectAltName}
priv, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
fmt.Println("Failed to generate private key:", err)
os.Exit(1)
}
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
template.SerialNumber, err = rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
fmt.Println("Failed to generate serial number:", err)
os.Exit(1)
}
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
if err != nil {
fmt.Println("Failed to create certificate:", err)
os.Exit(1)
}
certOut, err := os.Create("ca.crt")
if err != nil {
fmt.Println("Failed to open ca.pem for writing:", err)
os.Exit(1)
}
pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
certOut.Close()
keyOut, err := os.OpenFile("ca.key", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
fmt.Println("failed to open ca.key for writing:", err)
os.Exit(1)
}
pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
keyOut.Close()
}
当我这样做时,结果是
X509v3 extensions:
X509v3 Key Usage: critical
Digital Signature, Key Encipherment, Certificate Sign, CRL Sign
X509v3 Extended Key Usage:
TLS Web Client Authentication, TLS Web Server Authentication
X509v3 Basic Constraints: critical
CA:TRUE
所以我希望类似
X509v3 Subject Alternative Name:
email:caoperator@disig.sk, URI:http://www.disig.sk/ca
如何使用这些值添加扩展名?
How do I add the extension with those values?
我还尝试了值: [] byte(``email:my@email.com,URI:http://some.tld/uri``)
<双重`",因为格式化
I also tried Value: []byte(``email:my@email.com, URI:http://some.tld/uri``)
< double "`" because formatting
推荐答案
extSubjectAltName := pkix.Extension{}
extSubjectAltName.Id = asn1.ObjectIdentifier{2, 5, 29, 17}
extSubjectAltName.Critical = false
extSubjectAltName.Value = []byte(`email:my@mail.tld, URI:http://ca.dom.tld/`)
template.ExtraExtensions = []pkix.Extension{extSubjectAltName}
注意: template.ExtraExtensions
而不是 template.Extensions
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