[management] Keep embedded IdP deployments on a single account (#7380)

management/cmd/management.go

@@ -236,6 +236,9 @@ func ApplyEmbeddedIdPConfig(ctx context.Context, cfg *nbconfig.Config) error {
 		// Embedded IdP requires single account mode - multiple account mode is not supported
 		return fmt.Errorf("embedded IdP requires single account mode; multiple account mode is not supported with embedded IdP. Please remove --disable-single-account-mode flag")
 	}
+	if mgmtSingleAccModeDomain == "" {
+		return fmt.Errorf("embedded IdP requires single account mode; --single-account-mode-domain must not be empty")
+	}
 	// Enable user deletion from IDP by default if EmbeddedIdP is enabled
 	userDeleteFromIDPEnabled = true
 

management/cmd/management_test.go

@@ -5,8 +5,12 @@ import (
 	"os"
 	"testing"
 
-	"github.com/netbirdio/netbird/shared/management/grpc"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	nbconfig "github.com/netbirdio/netbird/management/internals/server/config"
+	"github.com/netbirdio/netbird/management/server/idp"
+	"github.com/netbirdio/netbird/shared/management/grpc"
 )
 
 const (
@@ -60,6 +64,22 @@ func Test_LoadMgmtConfig_Empty(t *testing.T) {
 	assert.Nil(t, cfg.PerAccountHighestSupportedSyncMessageVersion)
 }
 
+func TestApplyEmbeddedIdPConfigRequiresSingleAccountDomain(t *testing.T) {
+	previousDomain := mgmtSingleAccModeDomain
+	previousDisabled := disableSingleAccMode
+	t.Cleanup(func() {
+		mgmtSingleAccModeDomain = previousDomain
+		disableSingleAccMode = previousDisabled
+	})
+
+	mgmtSingleAccModeDomain = ""
+	disableSingleAccMode = false
+	cfg := &nbconfig.Config{
+		EmbeddedIdP: &idp.EmbeddedIdPConfig{Enabled: true},
+	}
+	require.ErrorContains(t, ApplyEmbeddedIdPConfig(context.Background(), cfg), "embedded IdP requires single account mode")
+}
+
 func createConfig(config string) (string, error) {
 	tmpfile, err := os.CreateTemp("", "config.json")
 	if err != nil {