Merge pull request #32 from facchinm/auto_certificate

add generateCert commandline switch

Author: mastrolinux

certificates.go

@@ -0,0 +1,156 @@
+// 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.
+
+// Generate a self-signed X.509 certificate for a TLS server. Outputs to
+// 'cert.pem' and 'key.pem' and will overwrite existing files.
+
+package main
+
+import (
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"fmt"
+	log "github.com/Sirupsen/logrus"
+	"io/ioutil"
+	"math/big"
+	"net"
+	"os"
+	"strings"
+	"time"
+)
+
+var (
+	host       = "localhost"
+	validFrom  = ""
+	validFor   = 365 * 24 * time.Hour * 2 // 2 years
+	isCA       = true
+	rsaBits    = 2048
+	ecdsaCurve = ""
+)
+
+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 generateCertificates() {
+
+	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:
+		fmt.Fprintf(os.Stderr, "Unrecognized elliptic curve: %q", ecdsaCurve)
+		os.Exit(1)
+	}
+	if err != nil {
+		log.Fatalf("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 {
+			fmt.Fprintf(os.Stderr, "Failed to parse creation date: %s\n", err)
+			os.Exit(1)
+		}
+	}
+
+	notAfter := notBefore.Add(validFor)
+
+	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
+	serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
+	if err != nil {
+		log.Fatalf("failed to generate serial number: %s", err)
+	}
+
+	template := x509.Certificate{
+		SerialNumber: serialNumber,
+		Subject: pkix.Name{
+			Organization: []string{"Arduino LLC US"},
+		},
+		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 {
+		log.Fatalf("Failed to create certificate: %s", err)
+	}
+
+	certOut, err := os.Create("cert.pem")
+	if err != nil {
+		log.Fatalf("failed to open cert.pem for writing: %s", err)
+	}
+	pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
+	certOut.Close()
+	log.Print("written cert.pem\n")
+
+	ioutil.WriteFile("cert.cer", derBytes, 0644)
+
+	keyOut, err := os.OpenFile("key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
+	if err != nil {
+		log.Print("failed to open key.pem for writing:", err)
+		return
+	}
+	pem.Encode(keyOut, pemBlockForKey(priv))
+	keyOut.Close()
+	log.Print("written key.pem\n")
+}

fakecerts/cert.cer

@@ -39,6 +39,7 @@ var (
 	hostname       = flag.String("hostname", "unknown-hostname", "Override the hostname we get from the OS")
 	updateUrl      = flag.String("updateUrl", "", "")
 	appName        = flag.String("appName", "", "")
+	genCert        = flag.Bool("generateCert", false, "")
 	globalToolsMap = make(map[string]string)
 	tempToolsPath  = createToolsDir()
 	port           string
@@ -78,6 +79,11 @@ func main() {
 
 	flag.Parse()
 
+	if *genCert == true {
+		generateCertificates()
+		exit()
+	}
+
 	if *hibernate == false {
 
 		go func() {
@@ -233,6 +239,11 @@ func main() {
 			r.Handle("WSS", "/socket.io/", socketHandler)
 			r.GET("/info", infoHandler)
 			go func() {
+				// check if certificates exist; if not, use plain http
+				if _, err := os.Stat(filepath.Join(dest, "cert.pem")); os.IsNotExist(err) {
+					return
+				}
+
 				start := 8990
 				end := 9000
 				i := start