2019-01-25 01:22:36 +00:00
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package main
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import (
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"crypto/tls"
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"crypto/x509"
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"errors"
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"fmt"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"strings"
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2019-02-13 22:31:08 +00:00
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"sync"
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2019-01-25 01:22:36 +00:00
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"time"
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)
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const (
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autocertFile = "/var/run/autocert.step.sm/site.crt"
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autocertKey = "/var/run/autocert.step.sm/site.key"
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autocertRoot = "/var/run/autocert.step.sm/root.crt"
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requestFrequency = 5 * time.Second
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2019-02-13 22:31:08 +00:00
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tickFrequency = 15 * time.Second
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2019-01-25 01:22:36 +00:00
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)
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2019-02-13 22:31:08 +00:00
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type rotator struct {
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sync.RWMutex
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certificate *tls.Certificate
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}
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func (r *rotator) getClientCertificate(cri *tls.CertificateRequestInfo) (*tls.Certificate, error) {
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r.RLock()
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defer r.RUnlock()
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return r.certificate, nil
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}
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func (r *rotator) loadCertificate(certFile, keyFile string) error {
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r.Lock()
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defer r.Unlock()
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c, err := tls.LoadX509KeyPair(certFile, keyFile)
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if err != nil {
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return err
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}
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r.certificate = &c
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return nil
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}
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2019-01-25 01:22:36 +00:00
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func loadRootCertPool() (*x509.CertPool, error) {
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root, err := ioutil.ReadFile(autocertRoot)
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if err != nil {
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return nil, err
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}
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pool := x509.NewCertPool()
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if ok := pool.AppendCertsFromPEM(root); !ok {
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return nil, errors.New("Missing or invalid root certificate")
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}
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return pool, nil
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}
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func main() {
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url := os.Getenv("HELLO_MTLS_URL")
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// Read the root certificate for our CA from disk
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roots, err := loadRootCertPool()
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if err != nil {
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log.Fatal(err)
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}
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2019-02-13 22:31:08 +00:00
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// Load certificate
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r := &rotator{}
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if err := r.loadCertificate(autocertFile, autocertKey); err != nil {
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log.Fatal("error loading certificate and key", err)
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}
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2019-01-25 01:22:36 +00:00
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// Create an HTTPS client using our cert, key & pool
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client := &http.Client{
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Transport: &http.Transport{
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TLSClientConfig: &tls.Config{
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RootCAs: roots,
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MinVersion: tls.VersionTLS12,
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CurvePreferences: []tls.CurveID{tls.CurveP521, tls.CurveP384, tls.CurveP256},
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CipherSuites: []uint16{
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tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
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tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
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},
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2019-02-13 22:31:08 +00:00
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// GetClientCertificate is called when a server requests a
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// certificate from a client.
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//
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// In this example keep alives will cause the certificate to
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// only be called once, but if we disable them,
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// GetClientCertificate will be called on every request.
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GetClientCertificate: r.getClientCertificate,
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2019-01-25 01:22:36 +00:00
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},
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2019-02-13 22:31:08 +00:00
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// Add this line to get the certificate on every request.
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// DisableKeepAlives: true,
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2019-01-25 01:22:36 +00:00
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},
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}
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2019-02-13 22:31:08 +00:00
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// Schedule periodic re-load of certificate
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2019-02-13 23:15:59 +00:00
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// A real implementation can use something like
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// https://github.com/fsnotify/fsnotify
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2019-02-13 22:31:08 +00:00
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done := make(chan struct{})
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go func() {
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ticker := time.NewTicker(tickFrequency)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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fmt.Println("Checking for new certificate...")
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err := r.loadCertificate(autocertFile, autocertKey)
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if err != nil {
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log.Println("Error loading certificate and key", err)
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}
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case <-done:
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return
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}
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}
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}()
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defer close(done)
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2019-01-25 01:22:36 +00:00
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for {
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// Make request
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r, err := client.Get(url)
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if err != nil {
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log.Fatal(err)
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}
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defer r.Body.Close()
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body, err := ioutil.ReadAll(r.Body)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("%s: %s\n", time.Now().Format(time.RFC3339), strings.Trim(string(body), "\n"))
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time.Sleep(requestFrequency)
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}
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}
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