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Refactor lets encrypt integration to support cert changes and ocsp stapling without restarting

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This commit is contained in:
Ken-Håvard Lieng 2016-01-06 22:19:06 +01:00
parent 2c26ced716
commit 47dd4f51cb
3 changed files with 146 additions and 70 deletions
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151
letsencrypt/letsencrypt.go
View File

@ -1,9 +1,11 @@
package letsencrypt
import (
"crypto/tls"
"encoding/json"
"io/ioutil"
"os"
"sync"
"time"
"github.com/khlieng/dispatch/Godeps/_workspace/src/github.com/xenolf/lego/acme"
@ -14,12 +16,12 @@ const KeySize = 2048
var directory Directory
func Run(dir, domain, email, port string, onChange func()) (string, string, error) {
func Run(dir, domain, email, port string) (*state, error) {
directory = Directory(dir)
user, err := getUser(email)
if err != nil {
return "", "", nil
return nil, err
}
client, err := acme.NewClient(URL, &user, KeySize)
@ -29,48 +31,114 @@ func Run(dir, domain, email, port string, onChange func()) (string, string, erro
if user.Registration == nil {
user.Registration, err = client.Register()
if err != nil {
return "", "", err
return nil, err
}
err = client.AgreeToTOS()
if err != nil {
return "", "", err
return nil, err
}
err = saveUser(user)
if err != nil {
return "", "", err
return nil, err
}
}
s := &state{
client: client,
domain: domain,
}
if certExists(domain) {
renew(client, domain)
if !s.renew() {
err = s.loadCert()
if err != nil {
return nil, err
}
}
s.refreshOCSP()
} else {
err = obtain(client, domain)
err = s.obtain()
if err != nil {
return "", "", err
return nil, err
}
}
go keepRenewed(client, domain, onChange)
go s.maintain()
return directory.Cert(domain), directory.Key(domain), nil
return s, nil
}
func obtain(client *acme.Client, domain string) error {
cert, errors := client.ObtainCertificate([]string{domain}, true)
if err := errors[domain]; err != nil {
type state struct {
client *acme.Client
domain string
cert *tls.Certificate
certPEM []byte
lock sync.Mutex
}
func (s *state) GetCertificate(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
s.lock.Lock()
cert := s.cert
s.lock.Unlock()
return cert, nil
}
func (s *state) getCertPEM() []byte {
s.lock.Lock()
certPEM := s.certPEM
s.lock.Unlock()
return certPEM
}
func (s *state) setCert(meta acme.CertificateResource) {
cert, err := tls.X509KeyPair(meta.Certificate, meta.PrivateKey)
if err == nil {
s.lock.Lock()
if s.cert != nil {
cert.OCSPStaple = s.cert.OCSPStaple
}
s.cert = &cert
s.certPEM = meta.Certificate
s.lock.Unlock()
}
}
func (s *state) setOCSP(ocsp []byte) {
cert := tls.Certificate{
OCSPStaple: ocsp,
}
s.lock.Lock()
if s.cert != nil {
cert.Certificate = s.cert.Certificate
cert.PrivateKey = s.cert.PrivateKey
}
s.cert = &cert
s.lock.Unlock()
}
func (s *state) obtain() error {
cert, errors := s.client.ObtainCertificate([]string{s.domain}, true)
if err := errors[s.domain]; err != nil {
if _, ok := err.(acme.TOSError); ok {
err := client.AgreeToTOS()
err := s.client.AgreeToTOS()
if err != nil {
return err
}
return obtain(client, domain)
return s.obtain()
}
return err
}
s.setCert(cert)
s.refreshOCSP()
err := saveCert(cert)
if err != nil {
return err
@ -79,8 +147,8 @@ func obtain(client *acme.Client, domain string) error {
return nil
}
func renew(client *acme.Client, domain string) bool {
cert, err := ioutil.ReadFile(directory.Cert(domain))
func (s *state) renew() bool {
cert, err := ioutil.ReadFile(directory.Cert(s.domain))
if err != nil {
return false
}
@ -93,12 +161,12 @@ func renew(client *acme.Client, domain string) bool {
daysLeft := int(exp.Sub(time.Now().UTC()).Hours() / 24)
if daysLeft <= 30 {
metaBytes, err := ioutil.ReadFile(directory.Meta(domain))
metaBytes, err := ioutil.ReadFile(directory.Meta(s.domain))
if err != nil {
return false
}
key, err := ioutil.ReadFile(directory.Key(domain))
key, err := ioutil.ReadFile(directory.Key(s.domain))
if err != nil {
return false
}
@ -112,10 +180,10 @@ func renew(client *acme.Client, domain string) bool {
meta.PrivateKey = key
Renew:
newMeta, err := client.RenewCertificate(meta, true)
newMeta, err := s.client.RenewCertificate(meta, true)
if err != nil {
if _, ok := err.(acme.TOSError); ok {
err := client.AgreeToTOS()
err := s.client.AgreeToTOS()
if err != nil {
return false
}
@ -124,6 +192,8 @@ func renew(client *acme.Client, domain string) bool {
return false
}
s.setCert(newMeta)
err = saveCert(newMeta)
if err != nil {
return false
@ -135,15 +205,46 @@ func renew(client *acme.Client, domain string) bool {
return false
}
func keepRenewed(client *acme.Client, domain string, onChange func()) {
func (s *state) refreshOCSP() {
ocsp, resp, err := acme.GetOCSPForCert(s.getCertPEM())
if err == nil && resp.Status == acme.OCSPGood {
s.setOCSP(ocsp)
}
}
func (s *state) maintain() {
renew := time.Tick(24 * time.Hour)
ocsp := time.Tick(1 * time.Hour)
for {
time.Sleep(24 * time.Hour)
if renew(client, domain) {
onChange()
select {
case <-renew:
s.renew()
case <-ocsp:
s.refreshOCSP()
}
}
}
func (s *state) loadCert() error {
cert, err := ioutil.ReadFile(directory.Cert(s.domain))
if err != nil {
return err
}
key, err := ioutil.ReadFile(directory.Key(s.domain))
if err != nil {
return err
}
s.setCert(acme.CertificateResource{
Certificate: cert,
PrivateKey: key,
})
return nil
}
func certExists(domain string) bool {
if _, err := os.Stat(directory.Cert(domain)); err != nil {
return false

28
server/server.go
View File

@ -1,6 +1,7 @@
package server
import (
"crypto/tls"
"log"
"net"
"net/http"
@ -46,23 +47,22 @@ func startHTTP() {
port := viper.GetString("port")
if viper.GetBool("https.enabled") {
var err error
portHTTPS := viper.GetString("https.port")
redirect := viper.GetBool("https.redirect")
https := restartableHTTPS{
addr: ":" + portHTTPS,
handler: http.HandlerFunc(serve),
}
if viper.GetBool("https.redirect") {
if redirect {
log.Println("[HTTP] Listening on port", port, "(HTTPS Redirect)")
go http.ListenAndServe(":"+port, createHTTPSRedirect(portHTTPS))
}
server := &http.Server{
Addr: ":" + portHTTPS,
Handler: http.HandlerFunc(serve),
}
if certExists() {
https.cert = viper.GetString("https.cert")
https.key = viper.GetString("https.key")
log.Println("[HTTPS] Listening on port", portHTTPS)
server.ListenAndServeTLS(viper.GetString("https.cert"), viper.GetString("https.key"))
} else if domain := viper.GetString("letsencrypt.domain"); domain != "" {
dir := storage.Path.LetsEncrypt()
email := viper.GetString("letsencrypt.email")
@ -73,16 +73,18 @@ func startHTTP() {
go http.ListenAndServe(":80", http.HandlerFunc(letsEncryptProxy))
}
https.cert, https.key, err = letsencrypt.Run(dir, domain, email, lePort, https.restart)
letsEncrypt, err := letsencrypt.Run(dir, domain, email, lePort)
if err != nil {
log.Fatal(err)
}
server.TLSConfig = &tls.Config{GetCertificate: letsEncrypt.GetCertificate}
log.Println("[HTTPS] Listening on port", portHTTPS)
log.Fatal(listenAndServeTLS(server))
} else {
log.Fatal("Could not locate SSL certificate or private key")
}
log.Println("[HTTPS] Listening on port", portHTTPS)
https.start()
} else {
log.Println("[HTTP] Listening on port", port)
log.Fatal(http.ListenAndServe(":"+port, http.HandlerFunc(serve)))

37
server/https.go → server/tls.go
View File

@ -10,43 +10,16 @@ import (
"github.com/khlieng/dispatch/Godeps/_workspace/src/github.com/spf13/viper"
)
type restartableHTTPS struct {
listener net.Listener
handler http.Handler
addr string
cert string
key string
}
func listenAndServeTLS(srv *http.Server) error {
srv.TLSConfig.NextProtos = []string{"http/1.1"}
func (r *restartableHTTPS) start() error {
var err error
config := &tls.Config{
NextProtos: []string{"http/1.1"},
Certificates: make([]tls.Certificate, 1),
}
config.Certificates[0], err = tls.LoadX509KeyPair(r.cert, r.key)
ln, err := net.Listen("tcp", srv.Addr)
if err != nil {
return err
}
ln, err := net.Listen("tcp", r.addr)
if err != nil {
return err
}
r.listener = tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, config)
return http.Serve(r.listener, r.handler)
}
func (r *restartableHTTPS) stop() {
r.listener.Close()
}
func (r *restartableHTTPS) restart() {
r.stop()
go r.start()
tlsListener := tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, srv.TLSConfig)
return srv.Serve(tlsListener)
}
type tcpKeepAliveListener struct {