[management] Fetch complete user data in ValidateTunnelPeer

Previously the `ValidateTunnelPeer` method used by the ProxyService
would fetch user information from the database if the connected peer
was associated with a user ID, but it would not consult the IdP data
for cached info from JWT claims like email.  This caused the value of
the injected `X-Netbird-User` header to always display the peer ID and
never the user email associated with the peer as expected.

This change adds an optional IdP manager to the ProxyService and
fetches the complete user data from it if present.

management/internals/modules/reverseproxy/service/manager/manager_test.go

@@ -434,7 +434,7 @@ func TestDeletePeerService_SourcePeerValidation(t *testing.T) {
 		t.Helper()
 		tokenStore := nbgrpc.NewOneTimeTokenStore(context.Background(), testCacheStore(t))
 		pkceStore := nbgrpc.NewPKCEVerifierStore(context.Background(), testCacheStore(t))
-		srv := nbgrpc.NewProxyServiceServer(nil, tokenStore, pkceStore, nbgrpc.ProxyOIDCConfig{}, nil, nil, nil, nil)
+		srv := nbgrpc.NewProxyServiceServer(nil, tokenStore, pkceStore, nbgrpc.ProxyOIDCConfig{}, nil, nil, nil, nil, nil)
 		return srv
 	}
 
@@ -723,7 +723,7 @@ func setupIntegrationTest(t *testing.T) (*Manager, store.Store) {
 
 	tokenStore := nbgrpc.NewOneTimeTokenStore(ctx, testCacheStore(t))
 	pkceStore := nbgrpc.NewPKCEVerifierStore(ctx, testCacheStore(t))
-	proxySrv := nbgrpc.NewProxyServiceServer(nil, tokenStore, pkceStore, nbgrpc.ProxyOIDCConfig{}, nil, nil, nil, nil)
+	proxySrv := nbgrpc.NewProxyServiceServer(nil, tokenStore, pkceStore, nbgrpc.ProxyOIDCConfig{}, nil, nil, nil, nil, nil)
 
 	proxyController, err := proxymanager.NewGRPCController(proxySrv, noop.NewMeterProvider().Meter(""))
 	require.NoError(t, err)
@@ -1147,7 +1147,7 @@ func TestDeleteService_DeletesTargets(t *testing.T) {
 
 	tokenStore := nbgrpc.NewOneTimeTokenStore(ctx, testCacheStore(t))
 	pkceStore := nbgrpc.NewPKCEVerifierStore(ctx, testCacheStore(t))
-	proxySrv := nbgrpc.NewProxyServiceServer(nil, tokenStore, pkceStore, nbgrpc.ProxyOIDCConfig{}, nil, nil, nil, nil)
+	proxySrv := nbgrpc.NewProxyServiceServer(nil, tokenStore, pkceStore, nbgrpc.ProxyOIDCConfig{}, nil, nil, nil, nil, nil)
 
 	proxyController, err := proxymanager.NewGRPCController(proxySrv, noop.NewMeterProvider().Meter(""))
 	require.NoError(t, err)

management/internals/server/boot.go

@@ -219,7 +219,7 @@ func (s *BaseServer) GRPCServer() *grpc.Server {
 
 func (s *BaseServer) ReverseProxyGRPCServer() *nbgrpc.ProxyServiceServer {
 	return Create(s, func() *nbgrpc.ProxyServiceServer {
-		proxyService := nbgrpc.NewProxyServiceServer(s.AccessLogsManager(), s.ProxyTokenStore(), s.PKCEVerifierStore(), s.proxyOIDCConfig(), s.PeersManager(), s.UsersManager(), s.ProxyManager(), s.Store())
+		proxyService := nbgrpc.NewProxyServiceServer(s.AccessLogsManager(), s.ProxyTokenStore(), s.PKCEVerifierStore(), s.proxyOIDCConfig(), s.PeersManager(), s.UsersManager(), s.IdpManager(), s.ProxyManager(), s.Store())
 		s.AfterInit(func(s *BaseServer) {
 			proxyService.SetServiceManager(s.ServiceManager())
 			proxyService.SetProxyController(s.ServiceProxyController())

management/internals/shared/grpc/proxy.go

@@ -33,6 +33,7 @@ import (
 	"github.com/netbirdio/netbird/management/internals/modules/reverseproxy/proxy"
 	rpservice "github.com/netbirdio/netbird/management/internals/modules/reverseproxy/service"
 	"github.com/netbirdio/netbird/management/internals/modules/reverseproxy/sessionkey"
+	"github.com/netbirdio/netbird/management/server/idp"
 	"github.com/netbirdio/netbird/management/server/types"
 	"github.com/netbirdio/netbird/management/server/users"
 	proxyauth "github.com/netbirdio/netbird/proxy/auth"
@@ -82,6 +83,9 @@ type ProxyServiceServer struct {
 	// Manager for users
 	usersManager users.Manager
 
+	// Manager for IdP-enriched user data (may be nil when no IdP is configured)
+	idpManager idp.Manager
+
 	// Store for one-time authentication tokens
 	tokenStore *OneTimeTokenStore
 
@@ -157,7 +161,7 @@ func enforceAccountScope(ctx context.Context, requestAccountID string) error {
 }
 
 // NewProxyServiceServer creates a new proxy service server.
-func NewProxyServiceServer(accessLogMgr accesslogs.Manager, tokenStore *OneTimeTokenStore, pkceStore *PKCEVerifierStore, oidcConfig ProxyOIDCConfig, peersManager peers.Manager, usersManager users.Manager, proxyMgr proxy.Manager, tokenChecker ProxyTokenChecker) *ProxyServiceServer {
+func NewProxyServiceServer(accessLogMgr accesslogs.Manager, tokenStore *OneTimeTokenStore, pkceStore *PKCEVerifierStore, oidcConfig ProxyOIDCConfig, peersManager peers.Manager, usersManager users.Manager, idpManager idp.Manager, proxyMgr proxy.Manager, tokenChecker ProxyTokenChecker) *ProxyServiceServer {
 	ctx, cancel := context.WithCancel(context.Background())
 	s := &ProxyServiceServer{
 		accessLogManager:  accessLogMgr,
@@ -166,6 +170,7 @@ func NewProxyServiceServer(accessLogMgr accesslogs.Manager, tokenStore *OneTimeT
 		pkceVerifierStore: pkceStore,
 		peersManager:      peersManager,
 		usersManager:      usersManager,
+		idpManager:        idpManager,
 		proxyManager:      proxyMgr,
 		tokenChecker:      tokenChecker,
 		snapshotBatchSize: snapshotBatchSizeFromEnv(),
@@ -1711,12 +1716,24 @@ func (s *ProxyServiceServer) ValidateTunnelPeer(ctx context.Context, req *proto.
 	principalID := peer.ID
 	displayIdentity := peer.Name
 	if peer.UserID != "" {
+		principalID = peer.UserID
+		// Stored column first (cheap, but often empty for OIDC-provisioned users).
 		if user, uerr := s.usersManager.GetUser(ctx, peer.UserID); uerr == nil && user != nil {
 			principalID = user.Id
 			if user.Email != "" {
 				displayIdentity = user.Email
 			}
 		}
+		// IdP enrichment wins when available — the stored email column is a
+		// best-effort cache and is frequently empty for OIDC users. Enrichment
+		// failures must never fail the RPC; we simply keep the stored/peer identity.
+		if s.idpManager != nil {
+			if ud, uerr := s.idpManager.GetUserDataByID(ctx, peer.UserID, idp.AppMetadata{WTAccountID: service.AccountID}); uerr == nil && ud != nil && ud.Email != "" {
+				displayIdentity = ud.Email
+			} else if uerr != nil {
+				log.WithFields(log.Fields{"domain": domain, "user_id": peer.UserID, "error": uerr.Error()}).Debug("ValidateTunnelPeer: IdP user enrichment failed; using stored/peer identity")
+			}
+		}
 	}
 
 	if err := checkPeerGroupAccess(service, groupIDs); err != nil {

management/internals/shared/grpc/proxy_group_access_test.go

@@ -3,14 +3,19 @@ package grpc
 import (
 	"context"
 	"errors"
+	"net"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
+	"github.com/netbirdio/netbird/management/internals/modules/peers"
 	"github.com/netbirdio/netbird/management/internals/modules/reverseproxy/proxy"
 	"github.com/netbirdio/netbird/management/internals/modules/reverseproxy/service"
+	"github.com/netbirdio/netbird/management/server/idp"
+	"github.com/netbirdio/netbird/management/server/peer"
 	"github.com/netbirdio/netbird/management/server/types"
+	"github.com/netbirdio/netbird/shared/management/proto"
 )
 
 type mockReverseProxyManager struct {
@@ -137,6 +142,52 @@ func (m *mockUsersManager) GetUserWithGroups(ctx context.Context, userID string)
 	return user, nil, nil
 }
 
+// mockTunnelPeersManager implements only the two peers.Manager methods that
+// ValidateTunnelPeer calls; the embedded interface satisfies the rest (and
+// panics if any unexpected method is invoked).
+type mockTunnelPeersManager struct {
+	peers.Manager
+	peer      *peer.Peer
+	peerErr   error
+	groups    []*types.Group
+	groupsErr error
+}
+
+func (m *mockTunnelPeersManager) GetPeerByTunnelIP(_ context.Context, _ string, _ net.IP) (*peer.Peer, error) {
+	return m.peer, m.peerErr
+}
+
+func (m *mockTunnelPeersManager) GetPeerWithGroups(_ context.Context, _, _ string) (*peer.Peer, []*types.Group, error) {
+	return m.peer, m.groups, m.groupsErr
+}
+
+// mockTunnelIdpManager implements only GetUserDataByID; the embedded interface
+// satisfies the rest of idp.Manager. hasData==false returns (nil, nil) to model
+// an IdP that knows nothing about the user.
+type mockTunnelIdpManager struct {
+	idp.Manager
+	email    string
+	hasData  bool
+	err      error
+	gotCalls int
+	gotMeta  []idp.AppMetadata
+}
+
+func (m *mockTunnelIdpManager) GetUserDataByID(_ context.Context, userID string, meta idp.AppMetadata) (*idp.UserData, error) {
+	m.gotCalls++
+	m.gotMeta = append(m.gotMeta, meta)
+	if m.err != nil {
+		return nil, m.err
+	}
+	if !m.hasData {
+		// This might not be a thing any of the actual IDP implementations do,
+		// i.e. return a nil value with no error, but it seems valuable to test
+		// that behavior here.
+		return nil, nil //nolint:nilnil
+	}
+	return &idp.UserData{ID: userID, Email: m.email}, nil
+}
+
 func TestValidateUserGroupAccess(t *testing.T) {
 	tests := []struct {
 		name             string
@@ -354,6 +405,163 @@ func TestValidateUserGroupAccess(t *testing.T) {
 	}
 }
 
+// TestValidateTunnelPeerUserEmailEnrichment verifies the UserEmail/UserId
+// resolution in ValidateTunnelPeer, including the IdP-enrichment fallback order
+// (IdP email -> stored User.Email -> peer.Name).
+func TestValidateTunnelPeerUserEmailEnrichment(t *testing.T) {
+	const (
+		domain    = "app.example.com"
+		accountID = "account1"
+		peerID    = "peer1"
+		peerName  = "peer-display-name"
+		userID    = "user1"
+	)
+
+	storedUser := map[string]*types.User{userID: {Id: userID, AccountID: accountID, Email: "stored@example.com"}}
+	storedUserNoEmail := map[string]*types.User{userID: {Id: userID, AccountID: accountID, Email: ""}}
+
+	tests := []struct {
+		name         string
+		peerUserID   string
+		storedUsers  map[string]*types.User
+		storedErr    error
+		noIdP        bool
+		idpEmail     string
+		idpHasData   bool
+		idpErr       error
+		expectEmail  string
+		expectUserID string
+		expectIdPHit bool
+	}{
+		{
+			name:         "idp email wins over stored email",
+			peerUserID:   userID,
+			storedUsers:  storedUser,
+			idpEmail:     "idp@example.com",
+			idpHasData:   true,
+			expectEmail:  "idp@example.com",
+			expectUserID: userID,
+			expectIdPHit: true,
+		},
+		{
+			name:         "stored email when idp returns empty email",
+			peerUserID:   userID,
+			storedUsers:  storedUser,
+			idpEmail:     "",
+			idpHasData:   true,
+			expectEmail:  "stored@example.com",
+			expectUserID: userID,
+			expectIdPHit: true,
+		},
+		{
+			name:         "stored email when idp has no data",
+			peerUserID:   userID,
+			storedUsers:  storedUser,
+			idpHasData:   false,
+			expectEmail:  "stored@example.com",
+			expectUserID: userID,
+			expectIdPHit: true,
+		},
+		{
+			name:         "stored email when idp errors",
+			peerUserID:   userID,
+			storedUsers:  storedUser,
+			idpErr:       errors.New("idp unreachable"),
+			expectEmail:  "stored@example.com",
+			expectUserID: userID,
+			expectIdPHit: true,
+		},
+		{
+			name:         "stored email when no idp manager",
+			peerUserID:   userID,
+			storedUsers:  storedUser,
+			noIdP:        true,
+			expectEmail:  "stored@example.com",
+			expectUserID: userID,
+		},
+		{
+			name:         "idp email when stored email is empty",
+			peerUserID:   userID,
+			storedUsers:  storedUserNoEmail,
+			idpEmail:     "idp@example.com",
+			idpHasData:   true,
+			expectEmail:  "idp@example.com",
+			expectUserID: userID,
+			expectIdPHit: true,
+		},
+		{
+			name:         "idp email when stored user missing keeps peer.UserID as principal",
+			peerUserID:   userID,
+			storedUsers:  map[string]*types.User{},
+			idpEmail:     "idp@example.com",
+			idpHasData:   true,
+			expectEmail:  "idp@example.com",
+			expectUserID: userID,
+			expectIdPHit: true,
+		},
+		{
+			name:         "unlinked peer uses peer name and never consults idp",
+			peerUserID:   "",
+			storedUsers:  storedUser,
+			idpEmail:     "idp@example.com",
+			idpHasData:   true,
+			expectEmail:  peerName,
+			expectUserID: peerID,
+			expectIdPHit: false,
+		},
+		{
+			name:         "linked peer with empty stored email and no idp falls back to peer name",
+			peerUserID:   userID,
+			storedUsers:  storedUserNoEmail,
+			noIdP:        true,
+			expectEmail:  peerName,
+			expectUserID: userID,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			svc := &service.Service{Domain: domain, AccountID: accountID}
+			server := &ProxyServiceServer{
+				serviceManager: &mockReverseProxyManager{
+					proxiesByAccount: map[string][]*service.Service{accountID: {svc}},
+				},
+				peersManager: &mockTunnelPeersManager{
+					peer: &peer.Peer{ID: peerID, Name: peerName, UserID: tt.peerUserID},
+				},
+				usersManager: &mockUsersManager{users: tt.storedUsers, err: tt.storedErr},
+			}
+
+			var idpMock *mockTunnelIdpManager
+			if !tt.noIdP {
+				idpMock = &mockTunnelIdpManager{email: tt.idpEmail, hasData: tt.idpHasData, err: tt.idpErr}
+				server.idpManager = idpMock
+			}
+
+			resp, err := server.ValidateTunnelPeer(context.Background(), &proto.ValidateTunnelPeerRequest{
+				Domain:   domain,
+				TunnelIp: "100.64.0.1",
+			})
+
+			require.NoError(t, err)
+			require.NotNil(t, resp)
+			assert.True(t, resp.GetValid(), "expected access granted")
+			assert.Equal(t, tt.expectEmail, resp.GetUserEmail())
+			assert.Equal(t, tt.expectUserID, resp.GetUserId())
+
+			if idpMock != nil {
+				if tt.expectIdPHit {
+					assert.Equal(t, 1, idpMock.gotCalls, "expected IdP to be consulted")
+					require.Len(t, idpMock.gotMeta, 1)
+					assert.Equal(t, accountID, idpMock.gotMeta[0].WTAccountID)
+				} else {
+					assert.Equal(t, 0, idpMock.gotCalls, "expected IdP to not be consulted")
+				}
+			}
+		})
+	}
+}
+
 func TestGetAccountProxyByDomain(t *testing.T) {
 	tests := []struct {
 		name             string

management/internals/shared/grpc/validate_session_test.go

@@ -42,7 +42,7 @@ func setupValidateSessionTest(t *testing.T) *validateSessionTestSetup {
 	tokenStore := NewOneTimeTokenStore(ctx, testCacheStore(t))
 	pkceStore := NewPKCEVerifierStore(ctx, testCacheStore(t))
 
-	proxyService := NewProxyServiceServer(nil, tokenStore, pkceStore, ProxyOIDCConfig{}, nil, usersManager, proxyManager, nil)
+	proxyService := NewProxyServiceServer(nil, tokenStore, pkceStore, ProxyOIDCConfig{}, nil, usersManager, nil, proxyManager, nil)
 	proxyService.SetServiceManager(serviceManager)
 
 	createTestProxies(t, ctx, testStore)

management/server/account_test.go

@@ -3215,7 +3215,7 @@ func createManager(t testing.TB) (*DefaultAccountManager, *update_channel.PeersU
 		return nil, nil, err
 	}
 
-	proxyGrpcServer := nbgrpc.NewProxyServiceServer(nil, nil, nil, nbgrpc.ProxyOIDCConfig{}, peersManager, nil, proxyManager, nil)
+	proxyGrpcServer := nbgrpc.NewProxyServiceServer(nil, nil, nil, nbgrpc.ProxyOIDCConfig{}, peersManager, nil, nil, proxyManager, nil)
 	proxyController, err := proxymanager.NewGRPCController(proxyGrpcServer, noop.Meter{})
 	if err != nil {
 		return nil, nil, err

management/server/http/handlers/proxy/auth_callback_integration_test.go

@@ -217,6 +217,7 @@ func setupAuthCallbackTest(t *testing.T) *testSetup {
 		usersManager,
 		nil,
 		nil,
+		nil,
 	)
 
 	proxyService.SetServiceManager(&testServiceManager{store: testStore})

management/server/http/testing/testing_tools/channel/channel.go

@@ -110,7 +110,7 @@ func BuildApiBlackBoxWithDBState(t testing_tools.TB, sqlFile string, expectedPee
 	if err != nil {
 		t.Fatalf("Failed to create proxy manager: %v", err)
 	}
-	proxyServiceServer := nbgrpc.NewProxyServiceServer(accessLogsManager, proxyTokenStore, pkceverifierStore, nbgrpc.ProxyOIDCConfig{}, peersManager, userManager, proxyMgr, nil)
+	proxyServiceServer := nbgrpc.NewProxyServiceServer(accessLogsManager, proxyTokenStore, pkceverifierStore, nbgrpc.ProxyOIDCConfig{}, peersManager, userManager, nil, proxyMgr, nil)
 	domainManager := manager.NewManager(store, proxyMgr, permissionsManager, am)
 	serviceProxyController, err := proxymanager.NewGRPCController(proxyServiceServer, noopMeter)
 	if err != nil {
@@ -240,7 +240,7 @@ func BuildApiBlackBoxWithDBStateAndPeerChannel(t testing_tools.TB, sqlFile strin
 	if err != nil {
 		t.Fatalf("Failed to create proxy manager: %v", err)
 	}
-	proxyServiceServer := nbgrpc.NewProxyServiceServer(accessLogsManager, proxyTokenStore, pkceverifierStore, nbgrpc.ProxyOIDCConfig{}, peersManager, userManager, proxyMgr, nil)
+	proxyServiceServer := nbgrpc.NewProxyServiceServer(accessLogsManager, proxyTokenStore, pkceverifierStore, nbgrpc.ProxyOIDCConfig{}, peersManager, userManager, nil, proxyMgr, nil)
 	domainManager := manager.NewManager(store, proxyMgr, permissionsManager, am)
 	serviceProxyController, err := proxymanager.NewGRPCController(proxyServiceServer, noopMeter)
 	if err != nil {

proxy/management_byop_integration_test.go

@@ -125,6 +125,7 @@ func setupBYOPIntegrationTest(t *testing.T) *byopTestSetup {
 		oidcConfig,
 		nil,
 		usersManager,
+		nil,
 		realProxyManager,
 		nil,
 	)

proxy/management_integration_test.go

@@ -140,6 +140,7 @@ func setupIntegrationTest(t *testing.T) *integrationTestSetup {
 		oidcConfig,
 		nil,
 		usersManager,
+		nil,
 		proxyManager,
 		nil,
 	)