mirror of https://github.com/ergochat/ergo.git
80 lines
2.4 KiB
Go
80 lines
2.4 KiB
Go
// Copyright (c) 2016- Daniel Oaks <daniel@danieloaks.net>
|
|
// released under the MIT license
|
|
|
|
package mkcerts
|
|
|
|
import (
|
|
"crypto/ecdsa"
|
|
"crypto/elliptic"
|
|
"crypto/rand"
|
|
"crypto/x509"
|
|
"crypto/x509/pkix"
|
|
"encoding/pem"
|
|
"fmt"
|
|
"math/big"
|
|
"net"
|
|
"os"
|
|
"time"
|
|
)
|
|
|
|
// CreateCert creates a testing ECDSA certificate, outputting the cert and key at the given filenames.
|
|
func CreateCert(orgName string, host string, certFilename string, keyFilename string) error {
|
|
validFrom := time.Now()
|
|
validFor := 365 * 24 * time.Hour
|
|
notAfter := validFrom.Add(validFor)
|
|
|
|
priv, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
|
|
|
|
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
|
|
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to generate serial number: %s", err)
|
|
}
|
|
|
|
template := x509.Certificate{
|
|
SerialNumber: serialNumber,
|
|
Subject: pkix.Name{
|
|
Organization: []string{orgName},
|
|
},
|
|
NotBefore: validFrom,
|
|
NotAfter: notAfter,
|
|
|
|
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
|
|
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
|
|
BasicConstraintsValid: true,
|
|
}
|
|
|
|
// TODO: allow explicitly listing allowed addresses/names
|
|
template.IPAddresses = append(template.IPAddresses, net.ParseIP("127.0.0.1"))
|
|
template.IPAddresses = append(template.IPAddresses, net.ParseIP("::1"))
|
|
if host != "" {
|
|
template.DNSNames = append(template.DNSNames, host)
|
|
}
|
|
template.DNSNames = append(template.DNSNames, "localhost")
|
|
|
|
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to create certificate: %s", err.Error())
|
|
}
|
|
|
|
certOut, err := os.Create(certFilename)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to open %s for writing: %s", certFilename, err.Error())
|
|
}
|
|
pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
|
|
certOut.Close()
|
|
|
|
keyOut, err := os.OpenFile(keyFilename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to open %s for writing: %s", keyFilename, err.Error())
|
|
}
|
|
b, err := x509.MarshalECPrivateKey(priv)
|
|
if err != nil {
|
|
return fmt.Errorf("Unable to marshal ECDSA private key: %v", err.Error())
|
|
}
|
|
pemBlock := pem.Block{Type: "EC PRIVATE KEY", Bytes: b}
|
|
pem.Encode(keyOut, &pemBlock)
|
|
keyOut.Close()
|
|
return nil
|
|
}
|