diff --git a/bin/slash/main.go b/bin/slash/main.go
index 13e0d31..a4f5b07 100644
--- a/bin/slash/main.go
+++ b/bin/slash/main.go
@@ -30,14 +30,12 @@ var (
 		Short: `An open source, self-hosted links shortener and sharing platform.`,
 		Run: func(_ *cobra.Command, _ []string) {
 			serverProfile := &profile.Profile{
-				Mode:        viper.GetString("mode"),
-				Port:        viper.GetInt("port"),
-				Data:        viper.GetString("data"),
-				DSN:         viper.GetString("dsn"),
-				Driver:      viper.GetString("driver"),
-				Public:      viper.GetBool("public"),
-				InstanceURL: viper.GetString("instance-url"),
-				Version:     version.GetCurrentVersion(viper.GetString("mode")),
+				Mode:    viper.GetString("mode"),
+				Port:    viper.GetInt("port"),
+				Data:    viper.GetString("data"),
+				DSN:     viper.GetString("dsn"),
+				Driver:  viper.GetString("driver"),
+				Version: version.GetCurrentVersion(viper.GetString("mode")),
 			}
 			if err := serverProfile.Validate(); err != nil {
 				panic(err)
@@ -105,7 +103,6 @@ func init() {
 	viper.SetDefault("mode", "demo")
 	viper.SetDefault("driver", "sqlite")
 	viper.SetDefault("port", 8082)
-	viper.SetDefault("public", true)
 
 	rootCmd.PersistentFlags().String("mode", "demo", `mode of server, can be "prod" or "dev" or "demo"`)
 	rootCmd.PersistentFlags().String("addr", "", "address of server")
@@ -113,8 +110,6 @@ func init() {
 	rootCmd.PersistentFlags().String("data", "", "data directory")
 	rootCmd.PersistentFlags().String("driver", "sqlite", "database driver")
 	rootCmd.PersistentFlags().String("dsn", "", "database source name(aka. DSN)")
-	rootCmd.PersistentFlags().Bool("public", true, "")
-	rootCmd.PersistentFlags().String("instance-url", "", "URL of the instance")
 
 	if err := viper.BindPFlag("mode", rootCmd.PersistentFlags().Lookup("mode")); err != nil {
 		panic(err)
@@ -131,18 +126,9 @@ func init() {
 	if err := viper.BindPFlag("dsn", rootCmd.PersistentFlags().Lookup("dsn")); err != nil {
 		panic(err)
 	}
-	if err := viper.BindPFlag("public", rootCmd.PersistentFlags().Lookup("public")); err != nil {
-		panic(err)
-	}
-	if err := viper.BindPFlag("instance-url", rootCmd.PersistentFlags().Lookup("instance-url")); err != nil {
-		panic(err)
-	}
 
 	viper.SetEnvPrefix("slash")
 	viper.AutomaticEnv()
-	if err := viper.BindEnv("instance-url", "SLASH_INSTANCE_URL"); err != nil {
-		panic(err)
-	}
 }
 
 func printGreetings(serverProfile *profile.Profile) {
@@ -152,8 +138,6 @@ func printGreetings(serverProfile *profile.Profile) {
 	println("port:", serverProfile.Port)
 	println("mode:", serverProfile.Mode)
 	println("version:", serverProfile.Version)
-	println("public:", serverProfile.Public)
-	println("instance-url:", serverProfile.InstanceURL)
 	println("---")
 	println(greetingBanner)
 	fmt.Printf("Version %s has been started on port %d\n", serverProfile.Version, serverProfile.Port)
diff --git a/proto/api/v1/workspace_service.proto b/proto/api/v1/workspace_service.proto
index a7dde91..d7541cf 100644
--- a/proto/api/v1/workspace_service.proto
+++ b/proto/api/v1/workspace_service.proto
@@ -45,14 +45,18 @@ message WorkspaceProfile {
 }
 
 message WorkspaceSetting {
+  // The url of instance.
+  string instance_url = 1;
   // The workspace custome branding.
-  bytes branding = 1;
+  bytes branding = 2;
   // The custom style.
-  string custom_style = 2;
+  string custom_style = 3;
   // The default visibility of shortcuts and collections.
-  Visibility default_visibility = 3;
+  Visibility default_visibility = 4;
   // The identity providers.
-  repeated IdentityProvider identity_providers = 4;
+  repeated IdentityProvider identity_providers = 5;
+  // Whether to disallow user registration by email&password.
+  bool disallow_user_registration = 6;
 }
 
 message IdentityProvider {
diff --git a/proto/gen/api/v1/README.md b/proto/gen/api/v1/README.md
index a9f44a9..4210236 100644
--- a/proto/gen/api/v1/README.md
+++ b/proto/gen/api/v1/README.md
@@ -1490,10 +1490,12 @@
 
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
+| instance_url | [string](#string) |  | The url of instance. |
 | branding | [bytes](#bytes) |  | The workspace custome branding. |
 | custom_style | [string](#string) |  | The custom style. |
 | default_visibility | [Visibility](#slash-api-v1-Visibility) |  | The default visibility of shortcuts and collections. |
 | identity_providers | [IdentityProvider](#slash-api-v1-IdentityProvider) | repeated | The identity providers. |
+| disallow_user_registration | [bool](#bool) |  | Whether to disallow user registration by email&password. |
 
 
 
diff --git a/proto/gen/api/v1/workspace_service.pb.go b/proto/gen/api/v1/workspace_service.pb.go
index 40ab719..d49d204 100644
--- a/proto/gen/api/v1/workspace_service.pb.go
+++ b/proto/gen/api/v1/workspace_service.pb.go
@@ -176,14 +176,18 @@ type WorkspaceSetting struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
+	// The url of instance.
+	InstanceUrl string `protobuf:"bytes,1,opt,name=instance_url,json=instanceUrl,proto3" json:"instance_url,omitempty"`
 	// The workspace custome branding.
-	Branding []byte `protobuf:"bytes,1,opt,name=branding,proto3" json:"branding,omitempty"`
+	Branding []byte `protobuf:"bytes,2,opt,name=branding,proto3" json:"branding,omitempty"`
 	// The custom style.
-	CustomStyle string `protobuf:"bytes,2,opt,name=custom_style,json=customStyle,proto3" json:"custom_style,omitempty"`
+	CustomStyle string `protobuf:"bytes,3,opt,name=custom_style,json=customStyle,proto3" json:"custom_style,omitempty"`
 	// The default visibility of shortcuts and collections.
-	DefaultVisibility Visibility `protobuf:"varint,3,opt,name=default_visibility,json=defaultVisibility,proto3,enum=slash.api.v1.Visibility" json:"default_visibility,omitempty"`
+	DefaultVisibility Visibility `protobuf:"varint,4,opt,name=default_visibility,json=defaultVisibility,proto3,enum=slash.api.v1.Visibility" json:"default_visibility,omitempty"`
 	// The identity providers.
-	IdentityProviders []*IdentityProvider `protobuf:"bytes,4,rep,name=identity_providers,json=identityProviders,proto3" json:"identity_providers,omitempty"`
+	IdentityProviders []*IdentityProvider `protobuf:"bytes,5,rep,name=identity_providers,json=identityProviders,proto3" json:"identity_providers,omitempty"`
+	// Whether to disallow user registration by email&password.
+	DisallowUserRegistration bool `protobuf:"varint,6,opt,name=disallow_user_registration,json=disallowUserRegistration,proto3" json:"disallow_user_registration,omitempty"`
 }
 
 func (x *WorkspaceSetting) Reset() {
@@ -218,6 +222,13 @@ func (*WorkspaceSetting) Descriptor() ([]byte, []int) {
 	return file_api_v1_workspace_service_proto_rawDescGZIP(), []int{1}
 }
 
+func (x *WorkspaceSetting) GetInstanceUrl() string {
+	if x != nil {
+		return x.InstanceUrl
+	}
+	return ""
+}
+
 func (x *WorkspaceSetting) GetBranding() []byte {
 	if x != nil {
 		return x.Branding
@@ -246,6 +257,13 @@ func (x *WorkspaceSetting) GetIdentityProviders() []*IdentityProvider {
 	return nil
 }
 
+func (x *WorkspaceSetting) GetDisallowUserRegistration() bool {
+	if x != nil {
+		return x.DisallowUserRegistration
+	}
+	return false
+}
+
 type IdentityProvider struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -698,120 +716,126 @@ var file_api_v1_workspace_service_proto_rawDesc = []byte{
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-	0x6f, 0x72, 0x6b, 0x73, 0x70, 0x61, 0x63, 0x65, 0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x12,
-	0x28, 0x2e, 0x73, 0x6c, 0x61, 0x73, 0x68, 0x2e, 0x61, 0x70, 0x69, 0x2e, 0x76, 0x31, 0x2e, 0x47,
-	0x65, 0x74, 0x57, 0x6f, 0x72, 0x6b, 0x73, 0x70, 0x61, 0x63, 0x65, 0x53, 0x65, 0x74, 0x74, 0x69,
-	0x6e, 0x67, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x1e, 0x2e, 0x73, 0x6c, 0x61, 0x73,
-	0x68, 0x2e, 0x61, 0x70, 0x69, 0x2e, 0x76, 0x31, 0x2e, 0x57, 0x6f, 0x72, 0x6b, 0x73, 0x70, 0x61,
-	0x63, 0x65, 0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x22, 0x21, 0x82, 0xd3, 0xe4, 0x93, 0x02,
-	0x1b, 0x12, 0x19, 0x2f, 0x61, 0x70, 0x69, 0x2f, 0x76, 0x31, 0x2f, 0x77, 0x6f, 0x72, 0x6b, 0x73,
-	0x70, 0x61, 0x63, 0x65, 0x2f, 0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x12, 0xa7, 0x01, 0x0a,
-	0x16, 0x55, 0x70, 0x64, 0x61, 0x74, 0x65, 0x57, 0x6f, 0x72, 0x6b, 0x73, 0x70, 0x61, 0x63, 0x65,
-	0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x12, 0x2b, 0x2e, 0x73, 0x6c, 0x61, 0x73, 0x68, 0x2e,
-	0x61, 0x70, 0x69, 0x2e, 0x76, 0x31, 0x2e, 0x55, 0x70, 0x64, 0x61, 0x74, 0x65, 0x57, 0x6f, 0x72,
-	0x6b, 0x73, 0x70, 0x61, 0x63, 0x65, 0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x52, 0x65, 0x71,
-	0x75, 0x65, 0x73, 0x74, 0x1a, 0x1e, 0x2e, 0x73, 0x6c, 0x61, 0x73, 0x68, 0x2e, 0x61, 0x70, 0x69,
-	0x2e, 0x76, 0x31, 0x2e, 0x57, 0x6f, 0x72, 0x6b, 0x73, 0x70, 0x61, 0x63, 0x65, 0x53, 0x65, 0x74,
-	0x74, 0x69, 0x6e, 0x67, 0x22, 0x40, 0xda, 0x41, 0x13, 0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67,
-	0x2c, 0x75, 0x70, 0x64, 0x61, 0x74, 0x65, 0x5f, 0x6d, 0x61, 0x73, 0x6b, 0x82, 0xd3, 0xe4, 0x93,
-	0x02, 0x24, 0x3a, 0x07, 0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x32, 0x19, 0x2f, 0x61, 0x70,
-	0x69, 0x2f, 0x76, 0x31, 0x2f, 0x77, 0x6f, 0x72, 0x6b, 0x73, 0x70, 0x61, 0x63, 0x65, 0x2f, 0x73,
-	0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x42, 0xb3, 0x01, 0x0a, 0x10, 0x63, 0x6f, 0x6d, 0x2e, 0x73,
-	0x6c, 0x61, 0x73, 0x68, 0x2e, 0x61, 0x70, 0x69, 0x2e, 0x76, 0x31, 0x42, 0x15, 0x57, 0x6f, 0x72,
-	0x6b, 0x73, 0x70, 0x61, 0x63, 0x65, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x50, 0x72, 0x6f,
-	0x74, 0x6f, 0x50, 0x01, 0x5a, 0x36, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d,
-	0x2f, 0x79, 0x6f, 0x75, 0x72, 0x73, 0x65, 0x6c, 0x66, 0x68, 0x6f, 0x73, 0x74, 0x65, 0x64, 0x2f,
-	0x73, 0x6c, 0x61, 0x73, 0x68, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x67, 0x65, 0x6e, 0x2f,
-	0x61, 0x70, 0x69, 0x2f, 0x76, 0x31, 0x3b, 0x61, 0x70, 0x69, 0x76, 0x31, 0xa2, 0x02, 0x03, 0x53,
-	0x41, 0x58, 0xaa, 0x02, 0x0c, 0x53, 0x6c, 0x61, 0x73, 0x68, 0x2e, 0x41, 0x70, 0x69, 0x2e, 0x56,
-	0x31, 0xca, 0x02, 0x0c, 0x53, 0x6c, 0x61, 0x73, 0x68, 0x5c, 0x41, 0x70, 0x69, 0x5c, 0x56, 0x31,
-	0xe2, 0x02, 0x18, 0x53, 0x6c, 0x61, 0x73, 0x68, 0x5c, 0x41, 0x70, 0x69, 0x5c, 0x56, 0x31, 0x5c,
-	0x47, 0x50, 0x42, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61, 0xea, 0x02, 0x0e, 0x53, 0x6c,
-	0x61, 0x73, 0x68, 0x3a, 0x3a, 0x41, 0x70, 0x69, 0x3a, 0x3a, 0x56, 0x31, 0x62, 0x06, 0x70, 0x72,
-	0x6f, 0x74, 0x6f, 0x33,
+	0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x42, 0xb3, 0x01, 0x0a, 0x10, 0x63, 0x6f, 0x6d, 0x2e,
+	0x73, 0x6c, 0x61, 0x73, 0x68, 0x2e, 0x61, 0x70, 0x69, 0x2e, 0x76, 0x31, 0x42, 0x15, 0x57, 0x6f,
+	0x72, 0x6b, 0x73, 0x70, 0x61, 0x63, 0x65, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x50, 0x72,
+	0x6f, 0x74, 0x6f, 0x50, 0x01, 0x5a, 0x36, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f,
+	0x6d, 0x2f, 0x79, 0x6f, 0x75, 0x72, 0x73, 0x65, 0x6c, 0x66, 0x68, 0x6f, 0x73, 0x74, 0x65, 0x64,
+	0x2f, 0x73, 0x6c, 0x61, 0x73, 0x68, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x67, 0x65, 0x6e,
+	0x2f, 0x61, 0x70, 0x69, 0x2f, 0x76, 0x31, 0x3b, 0x61, 0x70, 0x69, 0x76, 0x31, 0xa2, 0x02, 0x03,
+	0x53, 0x41, 0x58, 0xaa, 0x02, 0x0c, 0x53, 0x6c, 0x61, 0x73, 0x68, 0x2e, 0x41, 0x70, 0x69, 0x2e,
+	0x56, 0x31, 0xca, 0x02, 0x0c, 0x53, 0x6c, 0x61, 0x73, 0x68, 0x5c, 0x41, 0x70, 0x69, 0x5c, 0x56,
+	0x31, 0xe2, 0x02, 0x18, 0x53, 0x6c, 0x61, 0x73, 0x68, 0x5c, 0x41, 0x70, 0x69, 0x5c, 0x56, 0x31,
+	0x5c, 0x47, 0x50, 0x42, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61, 0xea, 0x02, 0x0e, 0x53,
+	0x6c, 0x61, 0x73, 0x68, 0x3a, 0x3a, 0x41, 0x70, 0x69, 0x3a, 0x3a, 0x56, 0x31, 0x62, 0x06, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/proto/gen/apidocs.swagger.yaml b/proto/gen/apidocs.swagger.yaml
index 03a6e20..9c0a3a6 100644
--- a/proto/gen/apidocs.swagger.yaml
+++ b/proto/gen/apidocs.swagger.yaml
@@ -949,6 +949,9 @@ definitions:
   apiv1WorkspaceSetting:
     type: object
     properties:
+      instanceUrl:
+        type: string
+        description: The url of instance.
       branding:
         type: string
         format: byte
@@ -965,6 +968,9 @@ definitions:
           type: object
           $ref: '#/definitions/apiv1IdentityProvider'
         description: The identity providers.
+      disallowUserRegistration:
+        type: boolean
+        description: Whether to disallow user registration by email&password.
   protobufAny:
     type: object
     properties:
diff --git a/server/profile/profile.go b/server/profile/profile.go
index 4e9abfb..5da3f14 100644
--- a/server/profile/profile.go
+++ b/server/profile/profile.go
@@ -26,10 +26,6 @@ type Profile struct {
 	Version string
 	// Metric indicate the metric collection is enabled or not.
 	Metric bool
-	// Pubic is the flag whether the instance is public for others.
-	Public bool
-	// InstanceURL is the URL of the instance.
-	InstanceURL string
 }
 
 func (p *Profile) IsDev() bool {
diff --git a/server/route/api/v1/workspace_service.go b/server/route/api/v1/workspace_service.go
index aa5f2df..2b61a2c 100644
--- a/server/route/api/v1/workspace_service.go
+++ b/server/route/api/v1/workspace_service.go
@@ -15,9 +15,8 @@ import (
 
 func (s *APIV1Service) GetWorkspaceProfile(ctx context.Context, _ *v1pb.GetWorkspaceProfileRequest) (*v1pb.WorkspaceProfile, error) {
 	workspaceProfile := &v1pb.WorkspaceProfile{
-		Mode:         s.Profile.Mode,
-		Version:      s.Profile.Version,
-		EnableSignup: s.Profile.Public,
+		Mode:    s.Profile.Mode,
+		Version: s.Profile.Version,
 	}
 
 	// Load subscription plan from license service.
@@ -32,16 +31,17 @@ func (s *APIV1Service) GetWorkspaceProfile(ctx context.Context, _ *v1pb.GetWorks
 		workspaceProfile.Owner = fmt.Sprintf("%s%d", UserNamePrefix, owner.Id)
 	}
 
-	workspaceSettingGeneral, err := s.Store.GetWorkspaceSetting(ctx, &store.FindWorkspaceSetting{
-		Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
-	})
+	workspaceGeneralSetting, err := s.Store.GetWorkspaceGeneralSetting(ctx)
 	if err != nil {
-		return nil, errors.Wrap(err, "failed to get workspace setting")
+		return nil, errors.Wrap(err, "failed to get workspace general setting")
 	}
-	generalSetting := workspaceSettingGeneral.GetGeneral()
-	if generalSetting != nil {
-		workspaceProfile.Branding = generalSetting.GetBranding()
+	workspaceProfile.Branding = workspaceGeneralSetting.GetBranding()
+
+	workspaceSecuritySetting, err := s.Store.GetWorkspaceSecuritySetting(ctx)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to get workspace security setting")
 	}
+	workspaceProfile.EnableSignup = !workspaceSecuritySetting.DisallowUserRegistration
 
 	return workspaceProfile, nil
 }
@@ -89,49 +89,29 @@ func (s *APIV1Service) UpdateWorkspaceSetting(ctx context.Context, request *v1pb
 
 	for _, path := range request.UpdateMask.Paths {
 		if path == "branding" {
-			generalSetting, err := s.Store.GetWorkspaceSetting(ctx, &store.FindWorkspaceSetting{
-				Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
-			})
+			generalSetting, err := s.Store.GetWorkspaceGeneralSetting(ctx)
 			if err != nil {
 				return nil, status.Errorf(codes.Internal, "failed to get workspace setting: %v", err)
 			}
-			if generalSetting == nil {
-				generalSetting = &storepb.WorkspaceSetting{
-					Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
-					Value: &storepb.WorkspaceSetting_General{
-						General: &storepb.WorkspaceSetting_GeneralSetting{},
-					},
-				}
-			}
-			generalSetting.GetGeneral().Branding = request.Setting.Branding
+			generalSetting.Branding = request.Setting.Branding
 			if _, err := s.Store.UpsertWorkspaceSetting(ctx, &storepb.WorkspaceSetting{
 				Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
 				Value: &storepb.WorkspaceSetting_General{
-					General: generalSetting.GetGeneral(),
+					General: generalSetting,
 				},
 			}); err != nil {
 				return nil, status.Errorf(codes.Internal, "failed to update workspace setting: %v", err)
 			}
 		} else if path == "custom_style" {
-			generalSetting, err := s.Store.GetWorkspaceSetting(ctx, &store.FindWorkspaceSetting{
-				Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
-			})
+			generalSetting, err := s.Store.GetWorkspaceGeneralSetting(ctx)
 			if err != nil {
 				return nil, status.Errorf(codes.Internal, "failed to get workspace setting: %v", err)
 			}
-			if generalSetting == nil {
-				generalSetting = &storepb.WorkspaceSetting{
-					Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
-					Value: &storepb.WorkspaceSetting_General{
-						General: &storepb.WorkspaceSetting_GeneralSetting{},
-					},
-				}
-			}
-			generalSetting.GetGeneral().CustomStyle = request.Setting.CustomStyle
+			generalSetting.CustomStyle = request.Setting.CustomStyle
 			if _, err := s.Store.UpsertWorkspaceSetting(ctx, &storepb.WorkspaceSetting{
 				Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
 				Value: &storepb.WorkspaceSetting_General{
-					General: generalSetting.GetGeneral(),
+					General: generalSetting,
 				},
 			}); err != nil {
 				return nil, status.Errorf(codes.Internal, "failed to update workspace setting: %v", err)
diff --git a/server/route/frontend/frontend.go b/server/route/frontend/frontend.go
index 08e91ac..f8fb288 100644
--- a/server/route/frontend/frontend.go
+++ b/server/route/frontend/frontend.go
@@ -118,7 +118,11 @@ func (s *FrontendService) registerRoutes(e *echo.Echo) {
 }
 
 func (s *FrontendService) registerFileRoutes(ctx context.Context, e *echo.Echo) {
-	instanceURL := s.Profile.InstanceURL
+	workspaceGeneralSetting, err := s.Store.GetWorkspaceGeneralSetting(ctx)
+	if err != nil {
+		return
+	}
+	instanceURL := workspaceGeneralSetting.InstanceUrl
 	if instanceURL == "" {
 		return
 	}
diff --git a/server/server.go b/server/server.go
index 567202f..6d68b77 100644
--- a/server/server.go
+++ b/server/server.go
@@ -57,7 +57,7 @@ func NewServer(ctx context.Context, profile *profile.Profile, store *store.Store
 	secret := "slash"
 	if profile.Mode == "prod" {
 		var err error
-		secret, err = s.getSecretSessionName(ctx)
+		secret, err = s.getSecretSession(ctx)
 		if err != nil {
 			return nil, err
 		}
@@ -119,20 +119,19 @@ func (s *Server) GetEcho() *echo.Echo {
 	return s.e
 }
 
-func (s *Server) getSecretSessionName(ctx context.Context) (string, error) {
-	workspaceSettingGeneral, err := s.Store.GetWorkspaceSetting(ctx, &store.FindWorkspaceSetting{
-		Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
-	})
+func (s *Server) getSecretSession(ctx context.Context) (string, error) {
+	workspaceGeneralSetting, err := s.Store.GetWorkspaceGeneralSetting(ctx)
 	if err != nil {
 		return "", err
 	}
-	if workspaceSettingGeneral == nil || workspaceSettingGeneral.GetGeneral() == nil {
-		tempSecret := uuid.New().String()
-		workspaceSettingGeneral, err = s.Store.UpsertWorkspaceSetting(ctx, &storepb.WorkspaceSetting{
+	secretSession := workspaceGeneralSetting.SecretSession
+	if secretSession == "" {
+		secretSession = uuid.New().String()
+		_, err := s.Store.UpsertWorkspaceSetting(ctx, &storepb.WorkspaceSetting{
 			Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
 			Value: &storepb.WorkspaceSetting_General{
 				General: &storepb.WorkspaceSetting_GeneralSetting{
-					SecretSession: tempSecret,
+					SecretSession: secretSession,
 				},
 			},
 		})
@@ -140,5 +139,5 @@ func (s *Server) getSecretSessionName(ctx context.Context) (string, error) {
 			return "", err
 		}
 	}
-	return workspaceSettingGeneral.GetGeneral().SecretSession, nil
+	return secretSession, nil
 }
diff --git a/server/service/license/license.go b/server/service/license/license.go
index 92a1571..f832853 100644
--- a/server/service/license/license.go
+++ b/server/service/license/license.go
@@ -37,18 +37,13 @@ func NewLicenseService(profile *profile.Profile, store *store.Store) *LicenseSer
 }
 
 func (s *LicenseService) LoadSubscription(ctx context.Context) (*v1pb.Subscription, error) {
-	workspaceSettingGeneral, err := s.Store.GetWorkspaceSetting(ctx, &store.FindWorkspaceSetting{
-		Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
-	})
+	workspaceGeneralSetting, err := s.Store.GetWorkspaceGeneralSetting(ctx)
 	if err != nil {
-		return nil, errors.Wrap(err, "failed to get workspace setting")
+		return nil, errors.Wrap(err, "failed to get workspace general setting")
 	}
 
 	subscription := getSubscriptionForFreePlan()
-	licenseKey := ""
-	if workspaceSettingGeneral != nil {
-		licenseKey = workspaceSettingGeneral.GetGeneral().LicenseKey
-	}
+	licenseKey := workspaceGeneralSetting.LicenseKey
 	if licenseKey == "" {
 		return subscription, nil
 	}
@@ -93,25 +88,17 @@ func (s *LicenseService) UpdateSubscription(ctx context.Context, licenseKey stri
 }
 
 func (s *LicenseService) UpdateLicenseKey(ctx context.Context, licenseKey string) error {
-	workspaceSettingGeneral, err := s.Store.GetWorkspaceSetting(ctx, &store.FindWorkspaceSetting{
-		Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
-	})
+	workspaceGeneralSetting, err := s.Store.GetWorkspaceGeneralSetting(ctx)
 	if err != nil {
-		return errors.Wrap(err, "failed to get workspace setting")
+		return errors.Wrap(err, "failed to get workspace general setting")
 	}
-	if workspaceSettingGeneral == nil || workspaceSettingGeneral.GetGeneral() == nil {
-		workspaceSettingGeneral = &storepb.WorkspaceSetting{
-			Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
-			Value: &storepb.WorkspaceSetting_General{
-				General: &storepb.WorkspaceSetting_GeneralSetting{
-					LicenseKey: licenseKey,
-				},
-			},
-		}
-	} else {
-		workspaceSettingGeneral.GetGeneral().LicenseKey = licenseKey
-	}
-	_, err = s.Store.UpsertWorkspaceSetting(ctx, workspaceSettingGeneral)
+	workspaceGeneralSetting.LicenseKey = licenseKey
+	_, err = s.Store.UpsertWorkspaceSetting(ctx, &storepb.WorkspaceSetting{
+		Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
+		Value: &storepb.WorkspaceSetting_General{
+			General: workspaceGeneralSetting,
+		},
+	})
 	if err != nil {
 		return errors.Wrap(err, "failed to upsert workspace setting")
 	}
diff --git a/store/migrator.go b/store/migrator.go
index 3d159ab..f7be6a5 100644
--- a/store/migrator.go
+++ b/store/migrator.go
@@ -12,36 +12,26 @@ func (s *Store) MigrateWorkspaceSettings(ctx context.Context) error {
 		return err
 	}
 
-	workspaceSettingGeneral, err := s.GetWorkspaceSetting(ctx, &FindWorkspaceSetting{
-		Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
-	})
+	workspaceGeneralSetting, err := s.GetWorkspaceGeneralSetting(ctx)
 	if err != nil {
 		return err
 	}
-	if workspaceSettingGeneral == nil || workspaceSettingGeneral.GetGeneral() == nil {
-		workspaceSettingGeneral = &storepb.WorkspaceSetting{
-			Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
-			Value: &storepb.WorkspaceSetting_General{
-				General: &storepb.WorkspaceSetting_GeneralSetting{},
-			},
-		}
-	}
 	updateWorkspaceSetting := false
 	for _, workspaceSetting := range workspaceSettings {
 		if workspaceSetting.Key == storepb.WorkspaceSettingKey_WORKSPACE_SETTING_LICENSE_KEY {
-			workspaceSettingGeneral.GetGeneral().LicenseKey = workspaceSetting.Raw
+			workspaceGeneralSetting.LicenseKey = workspaceSetting.Raw
 			updateWorkspaceSetting = true
 			if err := s.DeleteWorkspaceSetting(ctx, storepb.WorkspaceSettingKey_WORKSPACE_SETTING_LICENSE_KEY); err != nil {
 				return err
 			}
 		} else if workspaceSetting.Key == storepb.WorkspaceSettingKey_WORKSPACE_SETTING_CUSTOM_STYLE {
-			workspaceSettingGeneral.GetGeneral().CustomStyle = workspaceSetting.Raw
+			workspaceGeneralSetting.CustomStyle = workspaceSetting.Raw
 			updateWorkspaceSetting = true
 			if err := s.DeleteWorkspaceSetting(ctx, storepb.WorkspaceSettingKey_WORKSPACE_SETTING_CUSTOM_STYLE); err != nil {
 				return err
 			}
 		} else if workspaceSetting.Key == storepb.WorkspaceSettingKey_WORKSPACE_SETTING_SECRET_SESSION {
-			workspaceSettingGeneral.GetGeneral().SecretSession = workspaceSetting.Raw
+			workspaceGeneralSetting.SecretSession = workspaceSetting.Raw
 			updateWorkspaceSetting = true
 			if err := s.DeleteWorkspaceSetting(ctx, storepb.WorkspaceSettingKey_WORKSPACE_SETTING_SECRET_SESSION); err != nil {
 				return err
@@ -49,7 +39,12 @@ func (s *Store) MigrateWorkspaceSettings(ctx context.Context) error {
 		}
 	}
 	if updateWorkspaceSetting {
-		if _, err := s.UpsertWorkspaceSetting(ctx, workspaceSettingGeneral); err != nil {
+		if _, err := s.UpsertWorkspaceSetting(ctx, &storepb.WorkspaceSetting{
+			Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
+			Value: &storepb.WorkspaceSetting_General{
+				General: workspaceGeneralSetting,
+			},
+		}); err != nil {
 			return err
 		}
 	}
diff --git a/store/workspace_setting.go b/store/workspace_setting.go
index 3274ba4..6f4b2cf 100644
--- a/store/workspace_setting.go
+++ b/store/workspace_setting.go
@@ -59,3 +59,33 @@ func (s *Store) DeleteWorkspaceSetting(ctx context.Context, key storepb.Workspac
 	s.workspaceSettingCache.Delete(key)
 	return nil
 }
+
+func (s *Store) GetWorkspaceGeneralSetting(ctx context.Context) (*storepb.WorkspaceSetting_GeneralSetting, error) {
+	setting, err := s.GetWorkspaceSetting(ctx, &FindWorkspaceSetting{
+		Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_GENERAL,
+	})
+	if err != nil {
+		return nil, err
+	}
+	generalSetting := &storepb.WorkspaceSetting_GeneralSetting{}
+	if setting != nil && setting.GetGeneral() != nil {
+		generalSetting = setting.GetGeneral()
+	}
+	return generalSetting, nil
+}
+
+func (s *Store) GetWorkspaceSecuritySetting(ctx context.Context) (*storepb.WorkspaceSetting_SecuritySetting, error) {
+	setting, err := s.GetWorkspaceSetting(ctx, &FindWorkspaceSetting{
+		Key: storepb.WorkspaceSettingKey_WORKSPACE_SETTING_SECURITY,
+	})
+	if err != nil {
+		return nil, err
+	}
+	securitySetting := &storepb.WorkspaceSetting_SecuritySetting{
+		DisallowUserRegistration: false,
+	}
+	if setting != nil && setting.GetGeneral() != nil {
+		securitySetting = setting.GetSecurity()
+	}
+	return securitySetting, nil
+}