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main.go
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main.go
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package main
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"flag"
"fmt"
"io/ioutil"
"log"
"math/big"
"net"
"net/http"
"path"
"path/filepath"
"time"
)
var (
isClient = flag.Bool("client", false, "Is the client")
addr = flag.String("addr", "localhost:8080", "`address`")
)
func main() {
flag.Parse()
if filepath.Ext(flag.Arg(0)) == ".pem" {
if *isClient {
log.Fatal(NewCert(flag.Arg(0)))
} else {
log.Fatal(NewCert(flag.Arg(0)))
}
}
if *isClient {
log.Fatal(Client())
} else {
log.Fatal(Server())
}
}
func echo(rw http.ResponseWriter, req *http.Request) {
fmt.Fprintf(rw, "%v", req.URL)
}
func Client() error {
config := &tls.Config{
RootCAs: x509.NewCertPool(),
}
// load the client certificates
clientCert, err := tls.LoadX509KeyPair("client.pem", "client.pem")
if err != nil {
return err
}
config.Certificates = append(config.Certificates, clientCert)
// load list of verified servers
validServers, err := ioutil.ReadFile("server.pem")
if err != nil {
return err
}
config.RootCAs.AppendCertsFromPEM(validServers)
client := &http.Client{
Transport: &http.Transport{
TLSClientConfig: config,
},
}
resp, err := client.Get("https://" + path.Join(*addr, "hello", "world"))
if err != nil {
return err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
log.Println("RESPONSE", string(body))
return nil
}
func Server() error {
config := &tls.Config{
ClientAuth: tls.RequireAndVerifyClientCert,
ClientCAs: x509.NewCertPool(),
}
// load the server certificates
serverCert, err := tls.LoadX509KeyPair("server.pem", "server.pem")
if err != nil {
return err
}
config.Certificates = append(config.Certificates, serverCert)
// load the verified clients
clientCAs, err := ioutil.ReadFile("client.pem")
if err != nil {
return err
}
config.ClientCAs.AppendCertsFromPEM(clientCAs)
// create the server
server := &http.Server{
Addr: *addr,
Handler: http.HandlerFunc(echo),
TLSConfig: config,
}
// setup tcp server
inner, err := net.Listen("tcp", server.Addr)
if err != nil {
return err
}
// start serving
listener := tls.NewListener(tcpKeepAliveListener{inner.(*net.TCPListener)}, config)
return server.Serve(listener)
}
// tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
// connections. It's used by ListenAndServe and ListenAndServeTLS so
// dead TCP connections (e.g. closing laptop mid-download) eventually
// go away.
type tcpKeepAliveListener struct {
*net.TCPListener
}
func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
tc, err := ln.AcceptTCP()
if err != nil {
return
}
tc.SetKeepAlive(true)
tc.SetKeepAlivePeriod(3 * time.Minute)
return tc, nil
}
func NewCert(pemfile string) error {
priv, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return fmt.Errorf("error generating new key: %s", err)
}
notBefore := time.Now()
notAfter := notBefore.Add(5 * 365 * 24 * time.Hour) // 5 years
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{"Hello"},
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment |
x509.KeyUsageDigitalSignature |
x509.KeyUsageDataEncipherment |
x509.KeyUsageCertSign,
ExtKeyUsage: []x509.ExtKeyUsage{
x509.ExtKeyUsageServerAuth,
x509.ExtKeyUsageClientAuth,
},
IsCA: true,
BasicConstraintsValid: true,
DNSNames: []string{"localhost"},
}
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
if err != nil {
return fmt.Errorf("Failed to create certificate: %s", err)
}
var pemOut bytes.Buffer
pem.Encode(&pemOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
pem.Encode(&pemOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
return ioutil.WriteFile(pemfile, pemOut.Bytes(), 0644)
}