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x509.go
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x509.go
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package tlsutil
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"math"
"math/big"
"net"
"time"
)
var (
Duration90d = time.Hour * 24 * 90
Duration365d = time.Hour * 24 * 365
)
type CACertConfig struct {
CommonName string
Organization string
}
type ServerCertConfig struct {
CommonName string
DNSNames []string
IPAddresses []string
}
type ClientCertConfig struct {
CommonName string
DNSNames []string
IPAddresses []string
}
func NewSelfSignedCACertificate(cfg CACertConfig, key *rsa.PrivateKey) (*x509.Certificate, error) {
now := time.Now()
tmpl := x509.Certificate{
SerialNumber: new(big.Int).SetInt64(0),
Subject: pkix.Name{
CommonName: cfg.CommonName,
Organization: []string{cfg.Organization},
},
NotBefore: now.UTC(),
NotAfter: now.Add(Duration365d).UTC(),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
BasicConstraintsValid: true,
IsCA: true,
}
certDERBytes, err := x509.CreateCertificate(rand.Reader, &tmpl, &tmpl, key.Public(), key)
if err != nil {
return nil, err
}
return x509.ParseCertificate(certDERBytes)
}
func NewSignedServerCertificate(cfg ServerCertConfig, key *rsa.PrivateKey, caCert *x509.Certificate, caKey *rsa.PrivateKey) (*x509.Certificate, error) {
ips := make([]net.IP, len(cfg.IPAddresses))
for i, ipStr := range cfg.IPAddresses {
ips[i] = net.ParseIP(ipStr)
}
serial, err := rand.Int(rand.Reader, new(big.Int).SetInt64(math.MaxInt64))
if err != nil {
return nil, err
}
certTmpl := x509.Certificate{
Subject: pkix.Name{
CommonName: cfg.CommonName,
Organization: caCert.Subject.Organization,
},
DNSNames: cfg.DNSNames,
IPAddresses: ips,
SerialNumber: serial,
NotBefore: caCert.NotBefore,
NotAfter: time.Now().Add(Duration90d).UTC(),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
}
certDERBytes, err := x509.CreateCertificate(rand.Reader, &certTmpl, caCert, key.Public(), caKey)
if err != nil {
return nil, err
}
return x509.ParseCertificate(certDERBytes)
}
func NewSignedClientCertificate(cfg ClientCertConfig, key *rsa.PrivateKey, caCert *x509.Certificate, caKey *rsa.PrivateKey) (*x509.Certificate, error) {
ips := make([]net.IP, len(cfg.IPAddresses))
for i, ipStr := range cfg.IPAddresses {
ips[i] = net.ParseIP(ipStr)
}
serial, err := rand.Int(rand.Reader, new(big.Int).SetInt64(math.MaxInt64))
if err != nil {
return nil, err
}
certTmpl := x509.Certificate{
Subject: pkix.Name{
CommonName: cfg.CommonName,
Organization: caCert.Subject.Organization,
},
DNSNames: cfg.DNSNames,
IPAddresses: ips,
SerialNumber: serial,
NotBefore: caCert.NotBefore,
NotAfter: time.Now().Add(Duration90d).UTC(),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
}
certDERBytes, err := x509.CreateCertificate(rand.Reader, &certTmpl, caCert, key.Public(), caKey)
if err != nil {
return nil, err
}
return x509.ParseCertificate(certDERBytes)
}