feat: TLS support (#3862)

* feat: TLS support

* add comment

* fix comment

cmd/admin/setup/setup.go

@@ -9,6 +9,7 @@ import (
 	"github.com/zitadel/logging"
 
 	"github.com/zitadel/zitadel/cmd/admin/key"
+	"github.com/zitadel/zitadel/cmd/admin/tls"
 	"github.com/zitadel/zitadel/internal/database"
 	"github.com/zitadel/zitadel/internal/eventstore"
 	"github.com/zitadel/zitadel/internal/migration"
@@ -28,6 +29,9 @@ func New() *cobra.Command {
 Requirements:
 - cockroachdb`,
 		Run: func(cmd *cobra.Command, args []string) {
+			err := tls.ModeFromFlag(cmd)
+			logging.OnError(err).Fatal("invalid tlsMode")
+
 			config := MustNewConfig(viper.GetViper())
 			steps := MustNewSteps(viper.New())
 
@@ -46,6 +50,7 @@ Requirements:
 func Flags(cmd *cobra.Command) {
 	cmd.PersistentFlags().StringArrayVar(&stepFiles, "steps", nil, "paths to step files to overwrite default steps")
 	key.AddMasterKeyFlag(cmd)
+	tls.AddTLSModeFlag(cmd)
 }
 
 func Setup(config *Config, steps *Steps, masterKey string) {

cmd/admin/start/config.go

@@ -16,6 +16,7 @@ import (
 	auth_es "github.com/zitadel/zitadel/internal/auth/repository/eventsourcing"
 	"github.com/zitadel/zitadel/internal/command"
 	"github.com/zitadel/zitadel/internal/config/hook"
+	"github.com/zitadel/zitadel/internal/config/network"
 	"github.com/zitadel/zitadel/internal/config/systemdefaults"
 	"github.com/zitadel/zitadel/internal/crypto"
 	"github.com/zitadel/zitadel/internal/database"
@@ -31,6 +32,7 @@ type Config struct {
 	ExternalPort      uint16
 	ExternalDomain    string
 	ExternalSecure    bool
+	TLS               network.TLS
 	HTTP2HostHeader   string
 	HTTP1HostHeader   string
 	WebAuthNName      string

cmd/admin/start/flags.go

@@ -5,14 +5,17 @@ import (
 	"github.com/spf13/viper"
 
 	"github.com/zitadel/zitadel/cmd/admin/key"
+	"github.com/zitadel/zitadel/cmd/admin/tls"
 )
 
+var tlsMode *string
+
 func startFlags(cmd *cobra.Command) {
 	bindUint16Flag(cmd, "port", "port to run ZITADEL on")
 	bindStringFlag(cmd, "externalDomain", "domain ZITADEL will be exposed on")
 	bindStringFlag(cmd, "externalPort", "port ZITADEL will be exposed on")
-	bindBoolFlag(cmd, "externalSecure", "if ZITADEL will be served on HTTPS")
 
+	tls.AddTLSModeFlag(cmd)
 	key.AddMasterKeyFlag(cmd)
 }
 

cmd/admin/start/start.go

@@ -2,6 +2,7 @@ package start
 
 import (
 	"context"
+	"crypto/tls"
 	"database/sql"
 	_ "embed"
 	"fmt"
@@ -21,6 +22,7 @@ import (
 	"golang.org/x/net/http2/h2c"
 
 	"github.com/zitadel/zitadel/cmd/admin/key"
+	cmd_tls "github.com/zitadel/zitadel/cmd/admin/tls"
 	admin_es "github.com/zitadel/zitadel/internal/admin/repository/eventsourcing"
 	"github.com/zitadel/zitadel/internal/api"
 	"github.com/zitadel/zitadel/internal/api/assets"
@@ -57,6 +59,10 @@ func New() *cobra.Command {
 Requirements:
 - cockroachdb`,
 		RunE: func(cmd *cobra.Command, args []string) error {
+			err := cmd_tls.ModeFromFlag(cmd)
+			if err != nil {
+				return err
+			}
 			config := MustNewConfig(viper.GetViper())
 			masterKey, err := key.MasterKey(cmd)
 			if err != nil {
@@ -136,14 +142,18 @@ func startZitadel(config *Config, masterKey string) error {
 	notification.Start(config.Notification, config.ExternalPort, config.ExternalSecure, commands, queries, dbClient, assets.HandlerPrefix, config.SystemDefaults.Notifications.FileSystemPath, keys.User, keys.SMTP, keys.SMS)
 
 	router := mux.NewRouter()
-	err = startAPIs(ctx, router, commands, queries, eventstoreClient, dbClient, config, storage, authZRepo, keys, config.SystemAPIUsers)
+	tlsConfig, err := config.TLS.Config()
 	if err != nil {
 		return err
 	}
-	return listen(ctx, router, config.Port)
+	err = startAPIs(ctx, router, commands, queries, eventstoreClient, dbClient, config, storage, authZRepo, keys)
+	if err != nil {
+		return err
+	}
+	return listen(ctx, router, config.Port, tlsConfig)
 }
 
-func startAPIs(ctx context.Context, router *mux.Router, commands *command.Commands, queries *query.Queries, eventstore *eventstore.Eventstore, dbClient *sql.DB, config *Config, store static.Storage, authZRepo authz_repo.Repository, keys *encryptionKeys, systemAPIKeys map[string]*internal_authz.SystemAPIUser) error {
+func startAPIs(ctx context.Context, router *mux.Router, commands *command.Commands, queries *query.Queries, eventstore *eventstore.Eventstore, dbClient *sql.DB, config *Config, store static.Storage, authZRepo authz_repo.Repository, keys *encryptionKeys) error {
 	repo := struct {
 		authz_repo.Repository
 		*query.Queries
@@ -151,9 +161,12 @@ func startAPIs(ctx context.Context, router *mux.Router, commands *command.Comman
 		authZRepo,
 		queries,
 	}
-	verifier := internal_authz.Start(repo, http_util.BuildHTTP(config.ExternalDomain, config.ExternalPort, config.ExternalSecure), systemAPIKeys)
-
-	apis := api.New(config.Port, router, queries, verifier, config.InternalAuthZ, config.ExternalSecure, config.HTTP2HostHeader, config.HTTP1HostHeader)
+	verifier := internal_authz.Start(repo, http_util.BuildHTTP(config.ExternalDomain, config.ExternalPort, config.ExternalSecure), config.SystemAPIUsers)
+	tlsConfig, err := config.TLS.Config()
+	if err != nil {
+		return err
+	}
+	apis := api.New(config.Port, router, queries, verifier, config.InternalAuthZ, config.ExternalSecure, tlsConfig, config.HTTP2HostHeader, config.HTTP1HostHeader)
 	authRepo, err := auth_es.Start(config.Auth, config.SystemDefaults, commands, queries, dbClient, keys.OIDC, keys.User)
 	if err != nil {
 		return fmt.Errorf("error starting auth repo: %w", err)
@@ -215,9 +228,9 @@ func startAPIs(ctx context.Context, router *mux.Router, commands *command.Comman
 	return nil
 }
 
-func listen(ctx context.Context, router *mux.Router, port uint16) error {
+func listen(ctx context.Context, router *mux.Router, port uint16, tlsConfig *tls.Config) error {
 	http2Server := &http2.Server{}
-	http1Server := &http.Server{Handler: h2c.NewHandler(router, http2Server)}
+	http1Server := &http.Server{Handler: h2c.NewHandler(router, http2Server), TLSConfig: tlsConfig}
 	lis, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
 	if err != nil {
 		return fmt.Errorf("tcp listener on %d failed: %w", port, err)
@@ -227,7 +240,12 @@ func listen(ctx context.Context, router *mux.Router, port uint16) error {
 
 	go func() {
 		logging.Infof("server is listening on %s", lis.Addr().String())
-		errCh <- http1Server.Serve(lis)
+		if tlsConfig != nil {
+			//we don't need to pass the files here, because we already initialized the TLS config on the server
+			errCh <- http1Server.ServeTLS(lis, "", "")
+		} else {
+			errCh <- http1Server.Serve(lis)
+		}
 	}()
 
 	shutdown := make(chan os.Signal, 1)

cmd/admin/start/start_from_init.go

@@ -8,6 +8,7 @@ import (
 	"github.com/zitadel/zitadel/cmd/admin/initialise"
 	"github.com/zitadel/zitadel/cmd/admin/key"
 	"github.com/zitadel/zitadel/cmd/admin/setup"
+	"github.com/zitadel/zitadel/cmd/admin/tls"
 )
 
 func NewStartFromInit() *cobra.Command {
@@ -22,6 +23,9 @@ Last ZITADEL starts.
 Requirements:
 - cockroachdb`,
 		Run: func(cmd *cobra.Command, args []string) {
+			err := tls.ModeFromFlag(cmd)
+			logging.OnError(err).Fatal("invalid tlsMode")
+
 			masterKey, err := key.MasterKey(cmd)
 			logging.OnError(err).Panic("No master key provided")
 

cmd/admin/tls/tls.go

@@ -0,0 +1,46 @@
+package tls
+
+import (
+	"errors"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+const (
+	flagTLSMode = "tlsMode"
+)
+
+var (
+	ErrValidValue = errors.New("value must either be `enabled`, `external` or `disabled`")
+)
+
+func AddTLSModeFlag(cmd *cobra.Command) {
+	if cmd.PersistentFlags().Lookup(flagTLSMode) != nil {
+		return
+	}
+	cmd.PersistentFlags().String(flagTLSMode, "", "start ZITADEL with (enabled), without (disabled) TLS or external component e.g. reverse proxy (external) terminating TLS, this flag will overwrite `externalSecure` and `tls.enabled` in configs files")
+}
+
+func ModeFromFlag(cmd *cobra.Command) error {
+	tlsMode, _ := cmd.Flags().GetString(flagTLSMode)
+	var tlsEnabled, externalSecure bool
+	switch tlsMode {
+	case "enabled":
+		tlsEnabled = true
+		externalSecure = true
+	case "external":
+		tlsEnabled = false
+		externalSecure = true
+	case "disabled":
+		tlsEnabled = false
+		externalSecure = false
+	case "":
+		return nil
+	default:
+		return ErrValidValue
+	}
+	viper.Set("tls.enabled", tlsEnabled)
+	viper.Set("externalSecure", externalSecure)
+	return nil
+}

cmd/defaults.yaml

@@ -3,11 +3,38 @@ Log:
   Formatter:
     Format: text
 
+# Port ZITADEL will listen on
 Port: 8080
+# Port ZITADEL is exposed on, it can differ from port e.g. if you proxy the traffic
+# !!! Changing this after initial setup breaks your system !!!
 ExternalPort: 8080
+# Domain / hostname ZITADEL is exposed externally
+# !!! Changing this after initial setup breaks your system !!!
 ExternalDomain: localhost
+# specifies if ZITADEL is exposed externally through TLS
+# this must be set to true even if TLS is not enabled on ZITADEL itself
+# but TLS traffic is terminated on a reverse proxy
+# !!! Changing this after initial setup breaks your system !!!
 ExternalSecure: true
+TLS:
+  # if enabled, ZITADEL will serve all traffic over TLS (HTTPS and gRPC)
+  # you must then also provide a private key and certificate to be used for the connection
+  # either directly or by a path to the corresponding file
+  Enabled: true
+  # Path to the private key of the TLS certificate, it will be loaded into the Key
+  # and overwrite any exising value
+  KeyPath: #/path/to/key/file.pem
+  # Private key of the TLS certificate (KeyPath will this overwrite, if specified)
+  Key: #<bas64 encoded content of a pem file>
+  # Path to the certificate for the TLS connection, it will be loaded into the Cert
+  # and overwrite any exising value
+  CertPath: #/path/to/cert/file.pem
+  # Certificate for the TLS connection (CertPath will this overwrite, if specified)
+  Cert: #<bas64 encoded content of a pem file>
+
+# Header name of HTTP2 (incl. gRPC) calls from which the instance will be matched
 HTTP2HostHeader: ":authority"
+# Header name of HTTP1 calls from which the instance will be matched
 HTTP1HostHeader: "host"
 
 WebAuthNName: ZITADEL

docs/docs/guides/installation/linux.mdx

@@ -14,7 +14,6 @@ cockroach start-single-node --insecure --background --http-addr :9090
 Configure your environment and generate a master encryption key
 
 ```bash
-export ZITADEL_EXTERNALSECURE=false
 export ZITADEL_EXTERNALDOMAIN=localhost
 export ZITADEL_DEFAULTINSTANCE_CUSTOMDOMAIN=localhost
 ```
@@ -28,5 +27,5 @@ curl -s https://api.github.com/repos/zitadel/zitadel/releases/tags/v2.0.0-v2-alp
 Run the database and application containers
 
 ```bash
-zitadel admin start-from-init --masterkey "MasterkeyNeedsToHave32Characters"
+zitadel admin start-from-init --tlsMode disabled --masterkey "MasterkeyNeedsToHave32Characters"
 ```

docs/docs/guides/installation/macos.mdx

@@ -14,7 +14,6 @@ cockroach start-single-node --insecure --background --http-addr :9090
 Configure your environment and generate a master encryption key
 
 ```bash
-export ZITADEL_EXTERNALSECURE=false
 export ZITADEL_EXTERNALDOMAIN=localhost
 export ZITADEL_DEFAULTINSTANCE_CUSTOMDOMAIN=localhost
 export MY_ARCHITECTURE="arm64 or amd64 depeding on your mac"
@@ -37,5 +36,5 @@ curl -s https://api.github.com/repos/zitadel/zitadel/releases/tags/v2.0.0-v2-alp
 Run ZITADEL
 
 ```bash
-zitadel admin start-from-init --masterkey "MasterkeyNeedsToHave32Characters"
+zitadel admin start-from-init --tlsMode disabled --masterkey "MasterkeyNeedsToHave32Characters"
 ```

internal/api/api.go

@@ -2,6 +2,7 @@ package api
 
 import (
 	"context"
+	"crypto/tls"
 	"net/http"
 	"strings"
 
@@ -34,7 +35,7 @@ type health interface {
 	Instance(ctx context.Context, shouldTriggerBulk bool) (*query.Instance, error)
 }
 
-func New(port uint16, router *mux.Router, queries *query.Queries, verifier *internal_authz.TokenVerifier, authZ internal_authz.Config, externalSecure bool, http2HostName, http1HostName string) *API {
+func New(port uint16, router *mux.Router, queries *query.Queries, verifier *internal_authz.TokenVerifier, authZ internal_authz.Config, externalSecure bool, tlsConfig *tls.Config, http2HostName, http1HostName string) *API {
 	api := &API{
 		port:           port,
 		verifier:       verifier,
@@ -43,7 +44,7 @@ func New(port uint16, router *mux.Router, queries *query.Queries, verifier *inte
 		externalSecure: externalSecure,
 		http1HostName:  http1HostName,
 	}
-	api.grpcServer = server.CreateServer(api.verifier, authZ, queries, http2HostName)
+	api.grpcServer = server.CreateServer(api.verifier, authZ, queries, http2HostName, tlsConfig)
 	api.routeGRPC()
 
 	api.RegisterHandler("/debug", api.healthHandler())

internal/api/grpc/server/server.go

@@ -1,8 +1,11 @@
 package server
 
 import (
+	"crypto/tls"
+
 	grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
 
 	"github.com/zitadel/zitadel/internal/api/authz"
 	grpc_api "github.com/zitadel/zitadel/internal/api/grpc"
@@ -20,9 +23,9 @@ type Server interface {
 	AuthMethods() authz.MethodMapping
 }
 
-func CreateServer(verifier *authz.TokenVerifier, authConfig authz.Config, queries *query.Queries, hostHeaderName string) *grpc.Server {
+func CreateServer(verifier *authz.TokenVerifier, authConfig authz.Config, queries *query.Queries, hostHeaderName string, tlsConfig *tls.Config) *grpc.Server {
 	metricTypes := []metrics.MetricType{metrics.MetricTypeTotalCount, metrics.MetricTypeRequestCount, metrics.MetricTypeStatusCode}
-	return grpc.NewServer(
+	serverOptions := []grpc.ServerOption{
 		grpc.UnaryInterceptor(
 			grpc_middleware.ChainUnaryServer(
 				middleware.DefaultTracingServer(),
@@ -37,5 +40,9 @@ func CreateServer(verifier *authz.TokenVerifier, authConfig authz.Config, querie
 				middleware.ServiceHandler(),
 			),
 		),
-	)
+	}
+	if tlsConfig != nil {
+		serverOptions = append(serverOptions, grpc.Creds(credentials.NewTLS(tlsConfig)))
+	}
+	return grpc.NewServer(serverOptions...)
 }

internal/config/network/config.go

@@ -0,0 +1,56 @@
+package network
+
+import (
+	"crypto/tls"
+	"errors"
+	"os"
+)
+
+var (
+	ErrMissingConfig = errors.New("")
+)
+
+type TLS struct {
+	//If enabled, ZITADEL will serve all traffic over TLS (HTTPS and gRPC)
+	//you must then also provide a private key and certificate to be used for the connection
+	//either directly or by a path to the corresponding file
+	Enabled bool
+	//Path to the private key of the TLS certificate, it will be loaded into the Key
+	//and overwrite any exising value
+	KeyPath string
+	//Path to the certificate for the TLS connection, it will be loaded into the Cert
+	//and overwrite any exising value
+	CertPath string
+	//Private key of the TLS certificate (KeyPath will this overwrite, if specified)
+	Key []byte
+	//Certificate for the TLS connection (CertPath will this overwrite, if specified)
+	Cert []byte
+}
+
+func (t *TLS) Config() (_ *tls.Config, err error) {
+	if !t.Enabled {
+		return nil, nil
+	}
+	if t.KeyPath != "" {
+		t.Key, err = os.ReadFile(t.KeyPath)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if t.CertPath != "" {
+		t.Cert, err = os.ReadFile(t.CertPath)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if t.Key == nil || t.Cert == nil {
+		return nil, ErrMissingConfig
+	}
+	tlsCert, err := tls.X509KeyPair(t.Cert, t.Key)
+	if err != nil {
+		return nil, err
+	}
+	return &tls.Config{
+		Certificates: []tls.Certificate{tlsCert},
+	}, nil
+}