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server.go
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server.go
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package dynamiclistener
import (
"context"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"encoding/base64"
"errors"
"fmt"
"net"
"net/http"
"reflect"
"strconv"
"strings"
"sync"
"time"
"github.com/hashicorp/golang-lru"
"github.com/rancher/norman/types/set"
"github.com/rancher/norman/types/slice"
"github.com/rancher/types/apis/management.cattle.io/v3"
"github.com/sirupsen/logrus"
"golang.org/x/crypto/acme/autocert"
"k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/util/cert"
)
const (
httpsMode = "https"
acmeMode = "acme"
)
type server struct {
sync.Mutex
listenConfigs v3.ListenConfigInterface
handler http.Handler
httpPort, httpsPort int
certs map[string]*tls.Certificate
ips *lru.Cache
listeners []net.Listener
servers []*http.Server
activeConfig *v3.ListenConfig
activeMode string
// dynamic config change on refresh
activeCert *tls.Certificate
activeCA *x509.Certificate
activeCAKey *rsa.PrivateKey
domains map[string]bool
tos []string
tosAll bool
}
func newServer(ctx context.Context, listenConfigs v3.ListenConfigInterface, handler http.Handler, httpPort, httpsPort int) *server {
s := &server{
listenConfigs: listenConfigs,
handler: handler,
httpPort: httpPort,
httpsPort: httpsPort,
certs: map[string]*tls.Certificate{},
}
s.ips, _ = lru.New(20)
go s.start(ctx)
return s
}
func (s *server) updateIPs(savedIPs map[string]bool) map[string]bool {
if s.activeCert != nil || s.activeConfig == nil {
return savedIPs
}
cfg, err := s.listenConfigs.Get(s.activeConfig.Name, v1.GetOptions{})
if err != nil {
return savedIPs
}
certs := map[string]string{}
for key, cert := range s.certs {
certs[key] = certToString(cert)
}
if !reflect.DeepEqual(certs, cfg.GeneratedCerts) {
cfg = cfg.DeepCopy()
cfg.GeneratedCerts = certs
cfg, err = s.listenConfigs.Update(cfg)
if err != nil {
return savedIPs
}
}
allIPs := map[string]bool{}
for _, k := range s.ips.Keys() {
s, ok := k.(string)
if ok {
allIPs[s] = true
}
}
a, b, _ := set.Diff(allIPs, savedIPs)
if len(a) == 0 && len(b) == 0 {
return savedIPs
}
cfg.KnownIPs = nil
for k := range allIPs {
cfg = cfg.DeepCopy()
cfg.KnownIPs = append(cfg.KnownIPs, k)
}
_, err = s.listenConfigs.Update(cfg)
if err != nil {
return savedIPs
}
return allIPs
}
func (s *server) start(ctx context.Context) {
savedIPs := map[string]bool{}
for {
savedIPs = s.updateIPs(savedIPs)
select {
case <-ctx.Done():
return
case <-time.After(5 * time.Second):
}
}
}
func (s *server) Disable(config *v3.ListenConfig) {
if s.activeConfig == nil {
return
}
if s.activeConfig.UID == config.UID {
s.activeConfig = nil
}
}
func (s *server) Enable(config *v3.ListenConfig) (bool, error) {
s.Lock()
defer s.Unlock()
if s.activeConfig != nil && s.activeConfig.CreationTimestamp.Before(&config.CreationTimestamp) {
return false, nil
}
s.domains = map[string]bool{}
for _, d := range config.Domains {
s.domains[d] = true
}
s.tos = config.TOS
s.tosAll = len(config.TOS) == 0 || slice.ContainsString(config.TOS, "auto")
if config.Key != "" && config.Cert != "" {
cert, err := tls.X509KeyPair([]byte(config.Cert), []byte(config.Key))
if err != nil {
return false, err
}
s.activeCert = &cert
}
if config.CACert != "" && config.CAKey != "" {
cert, err := tls.X509KeyPair([]byte(config.CACert), []byte(config.CAKey))
if err != nil {
return false, err
}
s.activeCAKey = cert.PrivateKey.(*rsa.PrivateKey)
x509Cert, err := x509.ParseCertificate(cert.Certificate[0])
if err != nil {
return false, err
}
s.activeCA = x509Cert
}
if s.activeConfig == nil || config.Mode != s.activeMode {
return true, s.reload(config)
}
return true, nil
}
func (s *server) hostPolicy(ctx context.Context, host string) error {
s.Lock()
defer s.Unlock()
if s.domains[host] {
return nil
}
return errors.New("acme/autocert: host not configured")
}
func (s *server) prompt(tos string) bool {
s.Lock()
defer s.Unlock()
if s.tosAll {
return true
}
return slice.ContainsString(s.tos, tos)
}
func (s *server) Shutdown() error {
for _, listener := range s.listeners {
if err := listener.Close(); err != nil {
return err
}
}
s.listeners = nil
for _, server := range s.servers {
go server.Shutdown(context.Background())
}
s.servers = nil
return nil
}
func (s *server) reload(config *v3.ListenConfig) error {
if err := s.Shutdown(); err != nil {
return err
}
switch config.Mode {
case acmeMode:
if err := s.serveACME(config); err != nil {
return err
}
case httpsMode:
if err := s.serveHTTPS(config); err != nil {
return err
}
}
for _, ipStr := range config.KnownIPs {
ip := net.ParseIP(ipStr)
if len(ip) > 0 {
s.ips.ContainsOrAdd(ipStr, ip)
}
}
for key, certString := range config.GeneratedCerts {
cert := stringToCert(certString)
if cert != nil {
s.certs[key] = cert
}
}
s.activeMode = config.Mode
s.activeConfig = config
return nil
}
func (s *server) getCertificate(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
s.Lock()
defer s.Unlock()
if s.activeCert != nil {
return s.activeCert, nil
}
mapKey := hello.ServerName
cn := hello.ServerName
dnsNames := []string{cn}
ipBased := false
var ips []net.IP
if cn == "" {
mapKey = fmt.Sprintf("local/%d", s.ips.Len())
ipBased = true
}
serverNameCert, ok := s.certs[mapKey]
if ok {
return serverNameCert, nil
}
if ipBased {
cn = "cattle"
for _, ipStr := range s.ips.Keys() {
ip := net.ParseIP(ipStr.(string))
if len(ip) > 0 {
ips = append(ips, ip)
}
}
}
cfg := cert.Config{
CommonName: cn,
Organization: s.activeCA.Subject.Organization,
Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
AltNames: cert.AltNames{
DNSNames: dnsNames,
IPs: ips,
},
}
key, err := cert.NewPrivateKey()
if err != nil {
return nil, err
}
cert, err := cert.NewSignedCert(cfg, key, s.activeCA, s.activeCAKey)
if err != nil {
return nil, err
}
tlsCert := &tls.Certificate{
Certificate: [][]byte{
cert.Raw,
},
PrivateKey: key,
}
s.certs[mapKey] = tlsCert
return tlsCert, nil
}
func (s *server) cacheIPHandler(handler http.Handler) http.Handler {
return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
h, _, err := net.SplitHostPort(req.Host)
if err != nil {
h = req.Host
}
ip := net.ParseIP(h)
if len(ip) > 0 {
s.ips.ContainsOrAdd(h, ip)
}
handler.ServeHTTP(resp, req)
})
}
func (s *server) serveHTTPS(config *v3.ListenConfig) error {
conf := &tls.Config{
GetCertificate: s.getCertificate,
}
listener, err := s.newListener(s.httpsPort, conf)
if err != nil {
return err
}
server := &http.Server{
Handler: s.Handler(),
}
if s.activeConfig == nil {
server.Handler = s.cacheIPHandler(server.Handler)
}
s.servers = append(s.servers, server)
s.startServer(listener, server)
httpListener, err := s.newListener(s.httpPort, nil)
if err != nil {
return err
}
httpServer := &http.Server{
Handler: httpRedirect(s.Handler()),
}
if s.activeConfig == nil {
httpServer.Handler = s.cacheIPHandler(httpServer.Handler)
}
s.servers = append(s.servers, httpServer)
s.startServer(httpListener, httpServer)
return nil
}
// Approach taken from letsencrypt, except manglePort is specific to us
func httpRedirect(next http.Handler) http.Handler {
return http.HandlerFunc(
func(rw http.ResponseWriter, r *http.Request) {
if r.Header.Get("x-Forwarded-Proto") == "https" {
next.ServeHTTP(rw, r)
return
}
if r.Method != "GET" && r.Method != "HEAD" {
http.Error(rw, "Use HTTPS", http.StatusBadRequest)
return
}
target := "https://" + manglePort(r.Host) + r.URL.RequestURI()
http.Redirect(rw, r, target, http.StatusFound)
})
}
func manglePort(hostport string) string {
host, port, err := net.SplitHostPort(hostport)
if err != nil {
return hostport
}
portInt, err := strconv.Atoi(port)
if err != nil {
return hostport
}
portInt = ((portInt / 1000) * 1000) + 443
return net.JoinHostPort(host, strconv.Itoa(portInt))
}
func (s *server) startServer(listener net.Listener, server *http.Server) {
go func() {
if err := server.Serve(listener); err != nil {
logrus.Errorf("server on %v returned err: %v", listener.Addr(), err)
}
}()
}
func (s *server) Handler() http.Handler {
return s.handler
}
func (s *server) newListener(port int, config *tls.Config) (net.Listener, error) {
addr := fmt.Sprintf(":%d", port)
l, err := net.Listen("tcp", addr)
if err != nil {
return nil, err
}
l = tcpKeepAliveListener{l.(*net.TCPListener)}
if config != nil {
l = tls.NewListener(l, config)
}
s.listeners = append(s.listeners, l)
logrus.Info("Listening on ", addr)
return l, nil
}
func (s *server) serveACME(config *v3.ListenConfig) error {
manager := autocert.Manager{
Cache: autocert.DirCache("certs-cache"),
Prompt: s.prompt,
HostPolicy: s.hostPolicy,
}
conf := &tls.Config{
GetCertificate: func(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
if hello.ServerName == "localhost" || hello.ServerName == "" {
newHello := *hello
newHello.ServerName = config.Domains[0]
return manager.GetCertificate(&newHello)
}
return manager.GetCertificate(hello)
},
NextProtos: []string{"h2", "http/1.1"},
}
httpsListener, err := s.newListener(s.httpsPort, conf)
if err != nil {
return err
}
httpListener, err := s.newListener(s.httpPort, nil)
if err != nil {
return err
}
httpServer := &http.Server{
Handler: manager.HTTPHandler(nil),
}
s.servers = append(s.servers, httpServer)
go func() {
if err := httpServer.Serve(httpListener); err != nil {
logrus.Errorf("http server returned err: %v", err)
}
}()
httpsServer := &http.Server{
Handler: s.Handler(),
}
s.servers = append(s.servers, httpsServer)
go func() {
if err := httpsServer.Serve(httpsListener); err != nil {
logrus.Errorf("https server returned err: %v", err)
}
}()
return nil
}
func stringToCert(certString string) *tls.Certificate {
parts := strings.Split(certString, "#")
if len(parts) != 2 {
return nil
}
cert, key := parts[0], parts[1]
keyBytes, err := base64.StdEncoding.DecodeString(key)
if err != nil {
return nil
}
rsaKey, err := x509.ParsePKCS1PrivateKey(keyBytes)
if err != nil {
return nil
}
certBytes, err := base64.StdEncoding.DecodeString(cert)
if err != nil {
return nil
}
return &tls.Certificate{
Certificate: [][]byte{certBytes},
PrivateKey: rsaKey,
}
}
func certToString(cert *tls.Certificate) string {
certString := base64.StdEncoding.EncodeToString(cert.Certificate[0])
keyString := base64.StdEncoding.EncodeToString(x509.MarshalPKCS1PrivateKey(cert.PrivateKey.(*rsa.PrivateKey)))
return certString + "#" + keyString
}
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
}