[relay] Feature/relay integration (#2244)

This update adds new relay integration for NetBird clients. The new relay is based on web sockets and listens on a single port.

- Adds new relay implementation with websocket with single port relaying mechanism
- refactor peer connection logic, allowing upgrade and downgrade from/to P2P connection
- peer connections are faster since it connects first to relay and then upgrades to P2P
- maintains compatibility with old clients by not using the new relay
- updates infrastructure scripts with new relay service

encryption/cert.go

@@ -0,0 +1,19 @@
+package encryption
+
+import "crypto/tls"
+
+func LoadTLSConfig(certFile, keyFile string) (*tls.Config, error) {
+	serverCert, err := tls.LoadX509KeyPair(certFile, keyFile)
+	if err != nil {
+		return nil, err
+	}
+
+	config := &tls.Config{
+		Certificates: []tls.Certificate{serverCert},
+		ClientAuth:   tls.NoClientCert,
+		NextProtos: []string{
+			"h2", "http/1.1", // enable HTTP/2
+		},
+	}
+	return config, nil
+}

encryption/letsencrypt.go

@@ -9,7 +9,7 @@ import (
 )
 
 // CreateCertManager wraps common logic of generating Let's encrypt certificate.
-func CreateCertManager(datadir string, letsencryptDomain string) (*autocert.Manager, error) {
+func CreateCertManager(datadir string, letsencryptDomain ...string) (*autocert.Manager, error) {
 	certDir := filepath.Join(datadir, "letsencrypt")
 
 	if _, err := os.Stat(certDir); os.IsNotExist(err) {
@@ -24,7 +24,7 @@ func CreateCertManager(datadir string, letsencryptDomain string) (*autocert.Mana
 	certManager := &autocert.Manager{
 		Prompt:     autocert.AcceptTOS,
 		Cache:      autocert.DirCache(certDir),
-		HostPolicy: autocert.HostWhitelist(letsencryptDomain),
+		HostPolicy: autocert.HostWhitelist(letsencryptDomain...),
 	}
 
 	return certManager, nil

encryption/route53.go

@@ -0,0 +1,87 @@
+package encryption
+
+import (
+	"context"
+	"crypto/tls"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/caddyserver/certmagic"
+	"github.com/libdns/route53"
+	log "github.com/sirupsen/logrus"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+	"golang.org/x/crypto/acme"
+)
+
+// Route53TLS by default, loads the AWS configuration from the environment.
+// env variables: AWS_REGION, AWS_PROFILE, AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_SESSION_TOKEN
+type Route53TLS struct {
+	DataDir string
+	Email   string
+	Domains []string
+	CA      string
+}
+
+func (r *Route53TLS) GetCertificate() (*tls.Config, error) {
+	if len(r.Domains) == 0 {
+		return nil, fmt.Errorf("no domains provided")
+	}
+
+	certmagic.Default.Logger = logger()
+	certmagic.Default.Storage = &certmagic.FileStorage{Path: r.DataDir}
+	certmagic.DefaultACME.Agreed = true
+	if r.Email != "" {
+		certmagic.DefaultACME.Email = r.Email
+	} else {
+		certmagic.DefaultACME.Email = emailFromDomain(r.Domains[0])
+	}
+
+	if r.CA == "" {
+		certmagic.DefaultACME.CA = certmagic.LetsEncryptProductionCA
+	} else {
+		certmagic.DefaultACME.CA = r.CA
+	}
+
+	certmagic.DefaultACME.DNS01Solver = &certmagic.DNS01Solver{
+		DNSManager: certmagic.DNSManager{
+			DNSProvider: &route53.Provider{},
+		},
+	}
+	cm := certmagic.NewDefault()
+	if err := cm.ManageSync(context.Background(), r.Domains); err != nil {
+		log.Errorf("failed to manage certificate: %v", err)
+		return nil, err
+	}
+
+	tlsConfig := &tls.Config{
+		GetCertificate: cm.GetCertificate,
+		NextProtos:     []string{"h2", "http/1.1", acme.ALPNProto},
+	}
+
+	return tlsConfig, nil
+}
+
+func emailFromDomain(domain string) string {
+	if domain == "" {
+		return ""
+	}
+
+	parts := strings.Split(domain, ".")
+	if len(parts) < 2 {
+		return ""
+	}
+	if parts[0] == "" {
+		return ""
+	}
+	return fmt.Sprintf("admin@%s.%s", parts[len(parts)-2], parts[len(parts)-1])
+}
+
+func logger() *zap.Logger {
+	return zap.New(zapcore.NewCore(
+		zapcore.NewConsoleEncoder(zap.NewProductionEncoderConfig()),
+		os.Stderr,
+		zap.ErrorLevel,
+	))
+}

encryption/route53_test.go

@@ -0,0 +1,84 @@
+package encryption
+
+import (
+	"context"
+	"io"
+	"net/http"
+	"os"
+	"testing"
+	"time"
+)
+
+func TestRoute53TLSConfig(t *testing.T) {
+	t.SkipNow() // This test requires AWS credentials
+	exampleString := "Hello, world!"
+	rtls := &Route53TLS{
+		DataDir: t.TempDir(),
+		Email:   os.Getenv("LE_EMAIL_ROUTE53"),
+		Domains: []string{os.Getenv("DOMAIN")},
+	}
+	tlsConfig, err := rtls.GetCertificate()
+	if err != nil {
+		t.Errorf("Route53TLSConfig failed: %v", err)
+	}
+
+	server := &http.Server{
+		Addr: ":8443",
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			_, _ = w.Write([]byte(exampleString))
+		}),
+		TLSConfig: tlsConfig,
+	}
+
+	go func() {
+		err := server.ListenAndServeTLS("", "")
+		if err != http.ErrServerClosed {
+			t.Errorf("Failed to start server: %v", err)
+		}
+	}()
+	defer func() {
+		if err := server.Shutdown(context.Background()); err != nil {
+			t.Errorf("Failed to shutdown server: %v", err)
+		}
+	}()
+
+	time.Sleep(1 * time.Second)
+	resp, err := http.Get("https://relay.godevltd.com:8443")
+	if err != nil {
+		t.Errorf("Failed to get response: %v", err)
+		return
+	}
+	defer func() {
+		_ = resp.Body.Close()
+	}()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		t.Errorf("Failed to read response body: %v", err)
+	}
+	if string(body) != exampleString {
+		t.Errorf("Unexpected response: %s", body)
+	}
+}
+
+func Test_emailFromDomain(t *testing.T) {
+	tests := []struct {
+		input string
+		want  string
+	}{
+		{"example.com", "admin@example.com"},
+		{"x.example.com", "admin@example.com"},
+		{"x.x.example.com", "admin@example.com"},
+		{"*.example.com", "admin@example.com"},
+		{"example", ""},
+		{"", ""},
+		{".com", ""},
+	}
+	for _, tt := range tests {
+		t.Run("domain test", func(t *testing.T) {
+			if got := emailFromDomain(tt.input); got != tt.want {
+				t.Errorf("emailFromDomain() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}