forked from ory/hydra
/
tls.go
160 lines (140 loc) · 4.1 KB
/
tls.go
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package handler
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ignore
// Generate a self-signed X.509 certificate for a TLS server. Outputs to
// 'cert.pem' and 'key.pem' and will overwrite existing files.
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"github.com/codegangsta/cli"
"math/big"
"net"
"os"
"strings"
"time"
)
func publicKey(priv interface{}) interface{} {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &k.PublicKey
case *ecdsa.PrivateKey:
return &k.PublicKey
default:
return nil
}
}
func pemBlockForKey(priv interface{}) *pem.Block {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}
case *ecdsa.PrivateKey:
b, err := x509.MarshalECPrivateKey(k)
if err != nil {
fmt.Fprintf(os.Stderr, "Unable to marshal ECDSA private key: %v", err)
os.Exit(2)
}
return &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}
default:
return nil
}
}
func CreateDummyTLSCert(ctx *cli.Context) error {
getEnv()
var (
host = ctx.String("host")
validFrom = ctx.String("start-date")
validFor = ctx.Duration("duration")
isCA = ctx.Bool("ca")
rsaBits = ctx.Int("rsa-bits")
ecdsaCurve = ctx.String("ecdsa-curve")
)
if len(host) == 0 {
return fmt.Errorf("Missing required --host parameter")
}
var priv interface{}
var err error
switch ecdsaCurve {
case "":
priv, err = rsa.GenerateKey(rand.Reader, rsaBits)
case "P224":
priv, err = ecdsa.GenerateKey(elliptic.P224(), rand.Reader)
case "P256":
priv, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
case "P384":
priv, err = ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
case "P521":
priv, err = ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
default:
return fmt.Errorf("Unrecognized elliptic curve: %q", ecdsaCurve)
os.Exit(1)
}
if err != nil {
return fmt.Errorf("failed to generate private key: %s", err)
}
var notBefore time.Time
if len(validFrom) == 0 {
notBefore = time.Now()
} else {
notBefore, err = time.Parse("Jan 2 15:04:05 2006", validFrom)
if err != nil {
return fmt.Errorf("Failed to parse creation date: %s\n", err)
}
}
notAfter := notBefore.Add(validFor)
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{"Acme Co"},
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
hosts := strings.Split(host, ",")
for _, h := range hosts {
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, h)
}
}
if isCA {
template.IsCA = true
template.KeyUsage |= x509.KeyUsageCertSign
}
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
if err != nil {
return fmt.Errorf("Failed to create certificate: %s", err)
}
certOut, err := os.Create(ctx.String("certificate-file-path"))
if err != nil {
return fmt.Errorf("failed to open cert.pem for writing: %s", err)
}
pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
certOut.Close()
fmt.Printf("Written certificate to: %s\n", ctx.String("certificate-file-path"))
keyOut, err := os.OpenFile(ctx.String("key-file-path"), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return fmt.Errorf("failed to open key.pem for writing:", err)
}
pem.Encode(keyOut, pemBlockForKey(priv))
keyOut.Close()
fmt.Printf("Written key to: %s\n", ctx.String("key-file-path"))
fmt.Println("DO NOT use these files in production!")
return nil
}