/
cert.go
164 lines (151 loc) · 4.02 KB
/
cert.go
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package cert
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"time"
log "github.com/sirupsen/logrus"
)
type CaCert struct {
Cert *x509.Certificate
PEM bytes.Buffer
PrivPEM bytes.Buffer
PrivKey *rsa.PrivateKey
Created bool
}
type SelfSignedCertRequest struct {
Domain string
}
type SelfSignedCertResult struct {
ServerTLSConf *tls.Config
ServerCert tls.Certificate
ClientTLSConf *tls.Config
CaCertPEM bytes.Buffer
CertPEM bytes.Buffer
PrivatePEM bytes.Buffer
}
var ca CaCert
func SelfSignedCert(req SelfSignedCertRequest) (SelfSignedCertResult, error) {
ca, err := getCA()
log.Infof("Certficate with domain %s was requested", req.Domain)
result := SelfSignedCertResult{}
if err != nil {
return result, err
}
result.CaCertPEM = ca.PEM
cert := &x509.Certificate{
SerialNumber: big.NewInt(1658),
Subject: pkix.Name{
Organization: []string{"Selfsigned"},
Country: []string{"XX"},
Province: []string{""},
Locality: []string{"Global"},
StreetAddress: []string{""},
PostalCode: []string{"99999"},
CommonName: req.Domain,
},
DNSNames: []string{req.Domain},
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,
}
certPrivKey, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return result, err
}
certBytes, err := x509.CreateCertificate(rand.Reader, cert, ca.Cert, &certPrivKey.PublicKey, ca.PrivKey)
if err != nil {
return result, err
}
certPEM := new(bytes.Buffer)
err = pem.Encode(certPEM, &pem.Block{
Type: "CERTIFICATE",
Bytes: certBytes,
})
if err != nil {
return result, err
}
result.CertPEM = *certPEM
certPrivKeyPEM := new(bytes.Buffer)
err = pem.Encode(certPrivKeyPEM, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(certPrivKey),
})
if err != nil {
return result, err
}
result.PrivatePEM = *certPrivKeyPEM
serverCert, err := tls.X509KeyPair(certPEM.Bytes(), certPrivKeyPEM.Bytes())
if err != nil {
return result, err
}
result.ServerCert = serverCert
result.ServerTLSConf = &tls.Config{
Certificates: []tls.Certificate{serverCert},
}
certpool := x509.NewCertPool()
certpool.AppendCertsFromPEM(ca.PEM.Bytes())
result.ClientTLSConf = &tls.Config{
RootCAs: certpool,
}
log.Infof("Certificate for domain %s finished", req.Domain)
return result, nil
}
// getCa return a fresh or already created self signed ca
func getCA() (*CaCert, error) {
if ca.Created {
log.Debugf("CA is already created, return existing")
return &ca, nil
}
log.Debugf("CA not created, generating CA-Cert")
caCertData := &x509.Certificate{
SerialNumber: big.NewInt(2019),
Subject: pkix.Name{
Organization: []string{"Selfsigned"},
Country: []string{"XX"},
Province: []string{""},
Locality: []string{"Global"},
StreetAddress: []string{""},
PostalCode: []string{"99999"},
},
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,
}
ca.Cert = caCertData
caPrivKey, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return &ca, err
}
ca.PrivKey = caPrivKey
caBytes, err := x509.CreateCertificate(rand.Reader, caCertData, caCertData, &caPrivKey.PublicKey, caPrivKey)
if err != nil {
return &ca, err
}
err = pem.Encode(&ca.PEM, &pem.Block{
Type: "CERTIFICATE",
Bytes: caBytes,
})
if err != nil {
return &ca, err
}
err = pem.Encode(&ca.PrivPEM, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(caPrivKey),
})
if err != nil {
return &ca, err
}
ca.Created = true
return &ca, nil
}