gproxy: listen on tls

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

internal/crypto/generate.go

@@ -1,24 +1,24 @@
 package crypto
 
 import (
-	"crypto/ecdsa"
-	"crypto/elliptic"
 	"crypto/rand"
+	"crypto/rsa"
+	"crypto/tls"
 	"crypto/x509"
 	"crypto/x509/pkix"
 	"encoding/pem"
 	"math/big"
-	"net"
-	"os"
 	"time"
 
 	log "github.com/sirupsen/logrus"
 )
 
-func GenerateKeypair(hosts []string) {
-	priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+// GenerateSelfSignedCert Generate a self-signed TLS Certificate, to be used as fallback
+func GenerateSelfSignedCert() (tls.Certificate, error) {
+	priv, err := rsa.GenerateKey(rand.Reader, 2048)
 	if err != nil {
 		log.Fatalf("Failed to generate private key: %v", err)
+		return tls.Certificate{}, err
 	}
 
 	keyUsage := x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment
@@ -30,12 +30,14 @@ func GenerateKeypair(hosts []string) {
 	serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
 	if err != nil {
 		log.Fatalf("Failed to generate serial number: %v", err)
+		return tls.Certificate{}, err
 	}
 
 	template := x509.Certificate{
 		SerialNumber: serialNumber,
 		Subject: pkix.Name{
-			Organization: []string{"BeryJu.org"},
+			Organization: []string{"authentik"},
+			CommonName:   "authentik default certificate",
 		},
 		NotBefore: notBefore,
 		NotAfter:  notAfter,
@@ -45,46 +47,17 @@ func GenerateKeypair(hosts []string) {
 		BasicConstraintsValid: true,
 	}
 
-	for _, h := range hosts {
-		if ip := net.ParseIP(h); ip != nil {
-			template.IPAddresses = append(template.IPAddresses, ip)
-		} else {
-			template.DNSNames = append(template.DNSNames, h)
-		}
-	}
+	template.DNSNames = []string{"*"}
 
-	derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, priv, priv)
+	derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
 	if err != nil {
-		log.Fatalf("Failed to create certificate: %v", err)
-	}
-
-	certOut, err := os.Create("cert.pem")
-	if err != nil {
-		log.Fatalf("Failed to open cert.pem for writing: %v", err)
-	}
-	if err := pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
-		log.Fatalf("Failed to write data to cert.pem: %v", err)
-	}
-	if err := certOut.Close(); err != nil {
-		log.Fatalf("Error closing cert.pem: %v", err)
-	}
-	log.Print("wrote cert.pem\n")
-
-	keyOut, err := os.OpenFile("key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
-	if err != nil {
-		log.Fatalf("Failed to open key.pem for writing: %v", err)
-		return
+		log.Warning(err)
 	}
+	pemBytes := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
 	privBytes, err := x509.MarshalPKCS8PrivateKey(priv)
 	if err != nil {
-		log.Fatalf("Unable to marshal private key: %v", err)
+		log.Warning(err)
 	}
-	if err := pem.Encode(keyOut, &pem.Block{Type: "PRIVATE KEY", Bytes: privBytes}); err != nil {
-		log.Fatalf("Failed to write data to key.pem: %v", err)
-	}
-	if err := keyOut.Close(); err != nil {
-		log.Fatalf("Error closing key.pem: %v", err)
-	}
-	log.Print("wrote key.pem\n")
-	return
+	privPemByes := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: privBytes})
+	return tls.X509KeyPair(pemBytes, privPemByes)
 }

internal/web/web.go

@@ -1,6 +1,9 @@
 package web
 
 import (
+	"context"
+	"errors"
+	"net"
 	"net/http"
 	"sync"
 
@@ -16,6 +19,8 @@ type WebServer struct {
 
 	LegacyProxy bool
 
+	stop chan struct{} // channel for waiting shutdown
+
 	m   *mux.Router
 	lh  *mux.Router
 	log *log.Entry
@@ -49,12 +54,45 @@ func (ws *WebServer) Run() {
 	}()
 	go func() {
 		defer wg.Done()
-		// ws.listenTLS()
+		ws.listenTLS()
 	}()
 	wg.Done()
 }
 
 func (ws *WebServer) listenPlain() {
+	ln, err := net.Listen("tcp", config.G.Web.Listen)
+	if err != nil {
+		ws.log.WithError(err).Fatalf("failed to listen")
+	}
+	ws.log.WithField("addr", config.G.Web.Listen).Info("Running")
+
+	ws.serve(ln)
+
 	ws.log.WithField("addr", config.G.Web.Listen).Info("Running")
 	http.ListenAndServe(config.G.Web.Listen, ws.m)
 }
+
+func (ws *WebServer) serve(listener net.Listener) {
+	srv := &http.Server{
+		Handler: ws.m,
+	}
+
+	// See https://golang.org/pkg/net/http/#Server.Shutdown
+	idleConnsClosed := make(chan struct{})
+	go func() {
+		<-ws.stop // wait notification for stopping server
+
+		// We received an interrupt signal, shut down.
+		if err := srv.Shutdown(context.Background()); err != nil {
+			// Error from closing listeners, or context timeout:
+			ws.log.Printf("HTTP server Shutdown: %v", err)
+		}
+		close(idleConnsClosed)
+	}()
+
+	err := srv.Serve(listener)
+	if err != nil && !errors.Is(err, http.ErrServerClosed) {
+		ws.log.Errorf("ERROR: http.Serve() - %s", err)
+	}
+	<-idleConnsClosed
+}

internal/web/web_ssl.go

@@ -0,0 +1,32 @@
+package web
+
+import (
+	"crypto/tls"
+	"net"
+
+	"goauthentik.io/internal/config"
+	"goauthentik.io/internal/crypto"
+)
+
+// ServeHTTPS constructs a net.Listener and starts handling HTTPS requests
+func (ws *WebServer) listenTLS() {
+	cert, err := crypto.GenerateSelfSignedCert()
+	if err != nil {
+		ws.log.WithError(err).Error("failed to generate default cert")
+	}
+	tlsConfig := &tls.Config{
+		MinVersion:   tls.VersionTLS12,
+		MaxVersion:   tls.VersionTLS12,
+		Certificates: []tls.Certificate{cert},
+	}
+
+	ln, err := net.Listen("tcp", config.G.Web.ListenTLS)
+	if err != nil {
+		ws.log.WithError(err).Fatalf("failed to listen")
+	}
+	ws.log.WithField("addr", config.G.Web.ListenTLS).Info("Running")
+
+	tlsListener := tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, tlsConfig)
+	ws.serve(tlsListener)
+	ws.log.Printf("closing %s", tlsListener.Addr())
+}

internal/web/web_utils.go

@@ -0,0 +1,31 @@
+package web
+
+import (
+	"log"
+	"net"
+	"time"
+)
+
+// 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() (net.Conn, error) {
+	tc, err := ln.AcceptTCP()
+	if err != nil {
+		return nil, err
+	}
+	err = tc.SetKeepAlive(true)
+	if err != nil {
+		log.Printf("Error setting Keep-Alive: %v", err)
+	}
+	err = tc.SetKeepAlivePeriod(3 * time.Minute)
+	if err != nil {
+		log.Printf("Error setting Keep-Alive period: %v", err)
+	}
+	return tc, nil
+}

outpost/main.go

@@ -1,5 +0,0 @@
-package main
-
-func main() {
-
-}