142 lines
3.1 KiB
Go
142 lines
3.1 KiB
Go
package main
|
|
|
|
import (
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
"errors"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"log"
|
|
"net/http"
|
|
"os"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
const (
|
|
autocertFile = "/var/run/autocert.step.sm/site.crt"
|
|
autocertKey = "/var/run/autocert.step.sm/site.key"
|
|
autocertRoot = "/var/run/autocert.step.sm/root.crt"
|
|
requestFrequency = 5 * time.Second
|
|
tickFrequency = 15 * time.Second
|
|
)
|
|
|
|
type rotator struct {
|
|
sync.RWMutex
|
|
certificate *tls.Certificate
|
|
}
|
|
|
|
func (r *rotator) getClientCertificate(cri *tls.CertificateRequestInfo) (*tls.Certificate, error) {
|
|
r.RLock()
|
|
defer r.RUnlock()
|
|
return r.certificate, nil
|
|
}
|
|
|
|
func (r *rotator) loadCertificate(certFile, keyFile string) error {
|
|
r.Lock()
|
|
defer r.Unlock()
|
|
|
|
c, err := tls.LoadX509KeyPair(certFile, keyFile)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
r.certificate = &c
|
|
|
|
return nil
|
|
}
|
|
|
|
func loadRootCertPool() (*x509.CertPool, error) {
|
|
root, err := ioutil.ReadFile(autocertRoot)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
pool := x509.NewCertPool()
|
|
if ok := pool.AppendCertsFromPEM(root); !ok {
|
|
return nil, errors.New("Missing or invalid root certificate")
|
|
}
|
|
|
|
return pool, nil
|
|
}
|
|
|
|
func main() {
|
|
url := os.Getenv("HELLO_MTLS_URL")
|
|
|
|
// Read the root certificate for our CA from disk
|
|
roots, err := loadRootCertPool()
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
// Load certificate
|
|
r := &rotator{}
|
|
if err := r.loadCertificate(autocertFile, autocertKey); err != nil {
|
|
log.Fatal("error loading certificate and key", err)
|
|
}
|
|
|
|
// Create an HTTPS client using our cert, key & pool
|
|
client := &http.Client{
|
|
Transport: &http.Transport{
|
|
TLSClientConfig: &tls.Config{
|
|
RootCAs: roots,
|
|
MinVersion: tls.VersionTLS12,
|
|
CurvePreferences: []tls.CurveID{tls.CurveP521, tls.CurveP384, tls.CurveP256},
|
|
CipherSuites: []uint16{
|
|
tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
|
|
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
|
|
},
|
|
// GetClientCertificate is called when a server requests a
|
|
// certificate from a client.
|
|
//
|
|
// In this example keep alives will cause the certificate to
|
|
// only be called once, but if we disable them,
|
|
// GetClientCertificate will be called on every request.
|
|
GetClientCertificate: r.getClientCertificate,
|
|
},
|
|
// Add this line to get the certificate on every request.
|
|
// DisableKeepAlives: true,
|
|
},
|
|
}
|
|
|
|
// Schedule periodic re-load of certificate
|
|
// A real implementation can use something like
|
|
// https://github.com/fsnotify/fsnotify
|
|
done := make(chan struct{})
|
|
go func() {
|
|
ticker := time.NewTicker(tickFrequency)
|
|
defer ticker.Stop()
|
|
for {
|
|
select {
|
|
case <-ticker.C:
|
|
fmt.Println("Checking for new certificate...")
|
|
err := r.loadCertificate(autocertFile, autocertKey)
|
|
if err != nil {
|
|
log.Println("Error loading certificate and key", err)
|
|
}
|
|
case <-done:
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
defer close(done)
|
|
|
|
for {
|
|
// Make request
|
|
r, err := client.Get(url)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
defer r.Body.Close()
|
|
body, err := ioutil.ReadAll(r.Body)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
fmt.Printf("%s: %s\n", time.Now().Format(time.RFC3339), strings.Trim(string(body), "\n"))
|
|
|
|
time.Sleep(requestFrequency)
|
|
}
|
|
}
|