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certificate.go
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certificate.go
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package node
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"time"
"github.com/dropbox/godropbox/container/set"
"github.com/dropbox/godropbox/errors"
"github.com/pritunl/pritunl-zero/database"
"github.com/pritunl/pritunl-zero/errortypes"
"github.com/sirupsen/logrus"
)
func selfCert(parent *x509.Certificate, parentKey *ecdsa.PrivateKey) (
cert *x509.Certificate, certByt []byte, certKey *ecdsa.PrivateKey,
err error) {
certKey, err = ecdsa.GenerateKey(
elliptic.P384(),
rand.Reader,
)
if err != nil {
err = &errortypes.ReadError{
errors.Wrap(err, "certificate: Failed to generate private key"),
}
return
}
serialLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serial, err := rand.Int(rand.Reader, serialLimit)
if err != nil {
err = &errortypes.ReadError{
errors.Wrap(
err,
"certificate: Failed to generate certificate serial",
),
}
return
}
certTempl := &x509.Certificate{
SerialNumber: serial,
Subject: pkix.Name{
Organization: []string{"Pritunl Zero"},
},
NotBefore: time.Now().Add(-24 * time.Hour),
NotAfter: time.Now().Add(26280 * time.Hour),
KeyUsage: x509.KeyUsageKeyEncipherment |
x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
SignatureAlgorithm: x509.ECDSAWithSHA256,
}
if parent == nil {
parent = certTempl
parentKey = certKey
}
certByt, err = x509.CreateCertificate(rand.Reader, certTempl, parent,
certKey.Public(), parentKey)
if err != nil {
err = &errortypes.ReadError{
errors.Wrap(err, "certificate: Failed to create certificate"),
}
return
}
cert, err = x509.ParseCertificate(certByt)
if err != nil {
err = &errortypes.ParseError{
errors.Wrap(err, "certificate: Failed to parse certificate"),
}
return
}
return
}
func SelfCert() (certPem, keyPem []byte, err error) {
if Self.SelfCertificate != "" && Self.SelfCertificateKey != "" {
certPem = []byte(Self.SelfCertificate)
keyPem = []byte(Self.SelfCertificateKey)
return
}
logrus.Info("certificate: Generating self signed certificate")
caCert, _, caKey, err := selfCert(nil, nil)
if err != nil {
return
}
_, certByt, certKey, err := selfCert(caCert, caKey)
if err != nil {
return
}
certKeyByte, err := x509.MarshalECPrivateKey(certKey)
if err != nil {
err = &errortypes.ParseError{
errors.Wrap(err, "certificate: Failed to parse private key"),
}
return
}
certKeyBlock := &pem.Block{
Type: "EC PRIVATE KEY",
Bytes: certKeyByte,
}
keyPem = pem.EncodeToMemory(certKeyBlock)
certBlock := &pem.Block{
Type: "CERTIFICATE",
Bytes: certByt,
}
certPem = pem.EncodeToMemory(certBlock)
db := database.GetDatabase()
defer db.Close()
Self.SelfCertificate = string(certPem)
Self.SelfCertificateKey = string(keyPem)
err = Self.CommitFields(db, set.NewSet(
"self_certificate", "self_certificate_key"))
if err != nil {
return
}
return
}