[management] allow disabling device code flow when using dex (#6809)

go.mod

@@ -335,7 +335,7 @@ replace github.com/cloudflare/circl => codeberg.org/cunicu/circl v0.0.0-20230801
 
 replace github.com/pion/ice/v4 => github.com/netbirdio/ice/v4 v4.0.0-20250908184934-6202be846b51
 
-replace github.com/dexidp/dex => github.com/netbirdio/dex v0.244.1-0.20260512110716-8d70ad8647c1
+replace github.com/dexidp/dex => github.com/netbirdio/dex v0.244.1-0.20260716205454-a163de3129e5
 
 replace github.com/dexidp/dex/api/v2 => github.com/netbirdio/dex/api/v2 v2.0.0-20260512110716-8d70ad8647c1
 

go.sum

@@ -476,8 +476,8 @@ github.com/morikuni/aec v1.0.0 h1:nP9CBfwrvYnBRgY6qfDQkygYDmYwOilePFkwzv4dU8A=
 github.com/morikuni/aec v1.0.0/go.mod h1:BbKIizmSmc5MMPqRYbxO4ZU0S0+P200+tUnFx7PXmsc=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
-github.com/netbirdio/dex v0.244.1-0.20260512110716-8d70ad8647c1 h1:4TaYr9O4xX0D2kszeOLclTiCbA3eHq3xWV+9ILJbIYs=
-github.com/netbirdio/dex v0.244.1-0.20260512110716-8d70ad8647c1/go.mod h1:IHH+H8vK2GfqtIt5u/5OdPh18yk0oDHuj2vz5+Goetg=
+github.com/netbirdio/dex v0.244.1-0.20260716205454-a163de3129e5 h1:3PwQv8aR46qN2u16+Dv6udnH3sbVKX5KrGwF35CKSI0=
+github.com/netbirdio/dex v0.244.1-0.20260716205454-a163de3129e5/go.mod h1:IHH+H8vK2GfqtIt5u/5OdPh18yk0oDHuj2vz5+Goetg=
 github.com/netbirdio/dex/api/v2 v2.0.0-20260512110716-8d70ad8647c1 h1:neE7z+FPUkldl3faK/Jt+hJK2L+1XfQ1W33TQhU9m88=
 github.com/netbirdio/dex/api/v2 v2.0.0-20260512110716-8d70ad8647c1/go.mod h1:awuTyT29CYALpEyET0S307EgNlPWrc7fFKRAyhsO45M=
 github.com/netbirdio/easyjson v0.9.0 h1:6Nw2lghSVuy8RSkAYDhDv1thBVEmfVbKZnV7T7Z6Aus=

idp/dex/config.go

@@ -613,6 +613,10 @@ func (c *YAMLConfig) ToServerConfig(stor storage.Storage, logger *slog.Logger) s
 		cfg.SupportedResponseTypes = c.OAuth2.ResponseTypes
 	}
 
+	if len(c.OAuth2.GrantTypes) > 0 {
+		cfg.AllowedGrantTypes = c.OAuth2.GrantTypes
+	}
+
 	// Apply expiry settings
 	if c.Expiry.IDTokens != "" {
 		if d, err := parseDuration(c.Expiry.IDTokens); err == nil {

idp/dex/provider.go

@@ -21,7 +21,7 @@ import (
 	"github.com/dexidp/dex/server/signer"
 	"github.com/dexidp/dex/storage"
 	"github.com/dexidp/dex/storage/sql"
-	jose "github.com/go-jose/go-jose/v4"
+	"github.com/go-jose/go-jose/v4"
 	"github.com/google/uuid"
 	"github.com/prometheus/client_golang/prometheus"
 	"golang.org/x/crypto/bcrypt"

idp/dex/provider_test.go

@@ -595,3 +595,90 @@ enablePasswordDB: true
 	assert.True(t, cfg.ContinueOnConnectorFailure,
 		"buildDexConfig must set ContinueOnConnectorFailure to true so management starts even if an external IdP is down")
 }
+
+func TestToServerConfig_WiresGrantTypes(t *testing.T) {
+	tmpDir, err := os.MkdirTemp("", "dex-grants-*")
+	require.NoError(t, err)
+	defer os.RemoveAll(tmpDir)
+
+	stor := openTestStorage(t, tmpDir)
+	defer stor.Close()
+
+	logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelError}))
+
+	grants := []string{"authorization_code", "refresh_token"}
+	cfg := &YAMLConfig{Issuer: "http://localhost:5599/oauth2", OAuth2: OAuth2{GrantTypes: grants}}
+	assert.Equal(t, grants, cfg.ToServerConfig(stor, logger).AllowedGrantTypes)
+
+	empty := &YAMLConfig{Issuer: "http://localhost:5599/oauth2"}
+	assert.Empty(t, empty.ToServerConfig(stor, logger).AllowedGrantTypes)
+}
+
+func newDeviceGuardProvider(t *testing.T, grantTypesYAML string) *Provider {
+	t.Helper()
+
+	tmpDir, err := os.MkdirTemp("", "dex-devguard-*")
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = os.RemoveAll(tmpDir) })
+
+	yamlContent := `
+issuer: http://localhost:5599/oauth2
+storage:
+  type: sqlite3
+  config:
+    file: ` + filepath.Join(tmpDir, "dex.db") + `
+web:
+  http: 127.0.0.1:5599
+enablePasswordDB: true
+` + grantTypesYAML
+
+	configPath := filepath.Join(tmpDir, "config.yaml")
+	require.NoError(t, os.WriteFile(configPath, []byte(yamlContent), 0644))
+
+	yamlConfig, err := LoadConfig(configPath)
+	require.NoError(t, err)
+
+	provider, err := NewProviderFromYAML(context.Background(), yamlConfig)
+	require.NoError(t, err)
+	t.Cleanup(func() { _ = provider.Stop(context.Background()) })
+	return provider
+}
+
+func TestHandler_BlocksDeviceEndpointsWhenDeviceGrantDisabled(t *testing.T) {
+	provider := newDeviceGuardProvider(t, `
+oauth2:
+  grantTypes:
+    - authorization_code
+    - refresh_token
+`)
+
+	devicePaths := []string{
+		"/oauth2/device",
+		"/oauth2/device/code",
+		"/oauth2/device/token",
+		"/oauth2/device/auth/verify_code",
+		"/oauth2/device/callback",
+	}
+	for _, path := range devicePaths {
+		for _, method := range []string{http.MethodGet, http.MethodPost} {
+			req := httptest.NewRequest(method, path, nil)
+			rec := httptest.NewRecorder()
+			provider.Handler().ServeHTTP(rec, req)
+			assert.Equal(t, http.StatusNotFound, rec.Code, "%s %s must be blocked", method, path)
+		}
+	}
+
+	req := httptest.NewRequest(http.MethodGet, "/oauth2/.well-known/openid-configuration", nil)
+	rec := httptest.NewRecorder()
+	provider.Handler().ServeHTTP(rec, req)
+	assert.Equal(t, http.StatusOK, rec.Code)
+}
+
+func TestHandler_AllowsDeviceEndpointsWhenGrantsDefault(t *testing.T) {
+	provider := newDeviceGuardProvider(t, "")
+
+	req := httptest.NewRequest(http.MethodPost, "/oauth2/device/code", nil)
+	rec := httptest.NewRecorder()
+	provider.Handler().ServeHTTP(rec, req)
+	assert.NotEqual(t, http.StatusNotFound, rec.Code)
+}

management/server/idp/embedded.go

@@ -76,6 +76,9 @@ type EmbeddedIdPConfig struct {
 	DashboardPostLogoutRedirectURIs []string
 	// StaticConnectors are additional connectors to seed during initialization
 	StaticConnectors []dex.Connector
+	// GrantTypes restricts allowed OAuth2 grants; empty means all (Dex default). Omit the
+	// device_code grant to disable the device flow; keep authorization_code and refresh_token.
+	GrantTypes []string
 }
 
 // EmbeddedStorageConfig holds storage configuration for the embedded IdP.
@@ -175,6 +178,7 @@ func (c *EmbeddedIdPConfig) ToYAMLConfig() (*dex.YAMLConfig, error) {
 		},
 		OAuth2: dex.OAuth2{
 			SkipApprovalScreen: true,
+			GrantTypes:         c.GrantTypes,
 		},
 		Frontend: dex.Frontend{
 			Issuer: "NetBird",