[management,proxy] Use single-use codes for OIDC session handoff (#7635)

* Generalize PKCE verifier store into SingleUseStore * Generalize PKCE verifier store into SingleUseStore * Extend single-use store to generate one-time retrieval codes * Hand off proxy OIDC session via one-time code instead of URL token * Use the single-use store in integration tests * Read active proxy versions by cluster * Detect proxy clusters that support session codes * Bind OIDC session handoff mode to signed state * Deprecate legacy OIDC session token handoff * Remove unrelated session code test stub * fix tests * fix merge * Fix session code compatibility detection * Isolate proxy session codes in shared cache * bump min session version
2026-09-29 18:19:07 +02:00 · 2026-09-29 18:29:55 +03:00
parent 7ff709f565
commit 30dd076b36
22 changed files with 676 additions and 281 deletions
@@ -20,6 +20,7 @@ type Manager interface {
 	ClusterRequireSubdomain(ctx context.Context, clusterAddr string) *bool
 	ClusterSupportsCrowdSec(ctx context.Context, clusterAddr string) *bool
 	ClusterSupportsPrivate(ctx context.Context, clusterAddr string) *bool
+	ClusterSupportsSessionCode(ctx context.Context, clusterAddr string) bool
 	CleanupStale(ctx context.Context, inactivityDuration time.Duration) error
 	GetAccountProxy(ctx context.Context, accountID string) (*Proxy, error)
 	CountAccountProxies(ctx context.Context, accountID string) (int64, error)
@@ -8,6 +8,7 @@ import (
 	"go.opentelemetry.io/otel/metric"

 	"github.com/netbirdio/netbird/management/internals/modules/reverseproxy/proxy"
+	nbversion "github.com/netbirdio/netbird/version"
 )

 // store defines the interface for proxy persistence operations
@@ -22,6 +23,7 @@ type store interface {
 	GetClusterRequireSubdomain(ctx context.Context, clusterAddr string) *bool
 	GetClusterSupportsCrowdSec(ctx context.Context, clusterAddr string) *bool
 	GetClusterSupportsPrivate(ctx context.Context, clusterAddr string) *bool
+	GetActiveProxyVersions(ctx context.Context, clusterAddr string) ([]string, error)
 	CleanupStaleProxies(ctx context.Context, inactivityDuration time.Duration) error
 	GetProxyByAccountID(ctx context.Context, accountID string) (*proxy.Proxy, error)
 	CountProxiesByAccountID(ctx context.Context, accountID string) (int64, error)
@@ -29,6 +31,8 @@ type store interface {
 	DeleteAccountCluster(ctx context.Context, clusterAddress, accountID string) error
 }

+const minSessionCodeVersion = "0.81.0"
+
 // Manager handles all proxy operations
 type Manager struct {
 	store   store
@@ -145,6 +149,22 @@ func (m Manager) ClusterSupportsPrivate(ctx context.Context, clusterAddr string)
 	return m.store.GetClusterSupportsPrivate(ctx, clusterAddr)
 }

+// ClusterSupportsSessionCode reports whether all active proxies support session codes.
+func (m Manager) ClusterSupportsSessionCode(ctx context.Context, clusterAddr string) bool {
+	versions, err := m.store.GetActiveProxyVersions(ctx, clusterAddr)
+	if err != nil || len(versions) == 0 {
+		return false
+	}
+
+	for _, version := range versions {
+		if supported, err := nbversion.MeetsMinVersion(minSessionCodeVersion, version); err != nil || !supported {
+			return false
+		}
+	}
+
+	return true
+}
+
 // CleanupStale removes proxies that haven't sent heartbeat in the specified duration
 func (m *Manager) CleanupStale(ctx context.Context, inactivityDuration time.Duration) error {
 	if err := m.store.CleanupStaleProxies(ctx, inactivityDuration); err != nil {
@@ -22,6 +22,7 @@ type mockStore struct {
 	updateProxyHeartbeatFunc                 func(ctx context.Context, p *proxy.Proxy) error
 	getActiveProxyClusterAddressesFunc       func(ctx context.Context) ([]string, error)
 	getActiveProxyClusterAddressesForAccFunc func(ctx context.Context, accountID string) ([]string, error)
+	getActiveProxyVersionsFunc               func(ctx context.Context, clusterAddress string) ([]string, error)
 	cleanupStaleProxiesFunc                  func(ctx context.Context, d time.Duration) error
 	getProxyByAccountIDFunc                  func(ctx context.Context, accountID string) (*proxy.Proxy, error)
 	countProxiesByAccountIDFunc              func(ctx context.Context, accountID string) (int64, error)
@@ -104,6 +105,12 @@ func (m *mockStore) GetClusterSupportsCrowdSec(_ context.Context, _ string) *boo
 func (m *mockStore) GetClusterSupportsPrivate(_ context.Context, _ string) *bool {
 	return nil
 }
+func (m *mockStore) GetActiveProxyVersions(ctx context.Context, clusterAddress string) ([]string, error) {
+	if m.getActiveProxyVersionsFunc != nil {
+		return m.getActiveProxyVersionsFunc(ctx, clusterAddress)
+	}
+	return nil, nil
+}

 func newTestManager(s store) *Manager {
 	meter := noop.NewMeterProvider().Meter("test")
@@ -114,6 +121,34 @@ func newTestManager(s store) *Manager {
 	return m
 }

+func TestClusterSupportsSessionCode(t *testing.T) {
+	tests := []struct {
+		name     string
+		versions []string
+		storeErr error
+		want     bool
+	}{
+		{name: "all supported", versions: []string{"0.81.0", "0.81.2"}, want: true},
+		{name: "one old proxy", versions: []string{"0.81.0", "0.80.0"}},
+		{name: "missing version", versions: []string{"0.81.0", ""}},
+		{name: "no active proxies"},
+		{name: "store error", storeErr: errors.New("db error")},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			s := &mockStore{
+				getActiveProxyVersionsFunc: func(_ context.Context, _ string) ([]string, error) {
+					return tt.versions, tt.storeErr
+				},
+			}
+
+			got := newTestManager(s).ClusterSupportsSessionCode(context.Background(), "cluster.example.com")
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}
+
 func TestConnect_WithAccountID(t *testing.T) {
 	accountID := "acc-123"

@@ -112,6 +112,20 @@ func (mr *MockManagerMockRecorder) ClusterSupportsPrivate(ctx, clusterAddr any)
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ClusterSupportsPrivate", reflect.TypeOf((*MockManager)(nil).ClusterSupportsPrivate), ctx, clusterAddr)
 }

+// ClusterSupportsSessionCode mocks base method.
+func (m *MockManager) ClusterSupportsSessionCode(ctx context.Context, clusterAddr string) bool {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "ClusterSupportsSessionCode", ctx, clusterAddr)
+	ret0, _ := ret[0].(bool)
+	return ret0
+}
+
+// ClusterSupportsSessionCode indicates an expected call of ClusterSupportsSessionCode.
+func (mr *MockManagerMockRecorder) ClusterSupportsSessionCode(ctx, clusterAddr any) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ClusterSupportsSessionCode", reflect.TypeOf((*MockManager)(nil).ClusterSupportsSessionCode), ctx, clusterAddr)
+}
+
 // Connect mocks base method.
 func (m *MockManager) Connect(ctx context.Context, proxyID, sessionID, clusterAddress, ipAddress, version string, accountID *string, capabilities *Capabilities) (*Proxy, error) {
 	m.ctrl.T.Helper()
@@ -27,8 +27,6 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"

-	"github.com/netbirdio/netbird/shared/management/domain"
-
 	"github.com/netbirdio/netbird/management/internals/modules/agentnetwork"
 	"github.com/netbirdio/netbird/management/internals/modules/peers"
 	"github.com/netbirdio/netbird/management/internals/modules/reverseproxy/accesslogs"
@@ -42,6 +40,7 @@ import (
 	"github.com/netbirdio/netbird/management/server/users"
 	proxyauth "github.com/netbirdio/netbird/proxy/auth"
 	"github.com/netbirdio/netbird/shared/hash/argon2id"
+	"github.com/netbirdio/netbird/shared/management/domain"
 	"github.com/netbirdio/netbird/shared/management/proto"
 	nbstatus "github.com/netbirdio/netbird/shared/management/status"
 )
@@ -142,7 +141,7 @@ type ProxyServiceServer struct {
 	// OIDC configuration for proxy authentication
 	oidcConfig ProxyOIDCConfig

-	// Store for PKCE verifiers
+	// singleUseStore backs both PKCE verifiers and OIDC session exchange codes.
 	singleUseStore *SingleUseStore

 	// tokenTTL is the lifetime of one-time tokens generated for proxy
@@ -158,6 +157,13 @@ type ProxyServiceServer struct {

 const pkceVerifierTTL = 10 * time.Minute

+const sessionCodeTTL = 60 * time.Second
+
+const sessionCodeCacheNamespace = "proxy:session"
+
+// The signed nonce binds the handoff mode without changing the state format.
+const sessionCodeNoncePrefix = "code."
+
 const defaultProxyTokenTTL = 5 * time.Minute

 const defaultSnapshotBatchSize = 500
@@ -306,6 +312,16 @@ func (s *ProxyServiceServer) proxyConnectAuthorizer() ProxyConnectAuthorizer {
 	return s.connectAuthorizer
 }

+// GenerateSessionCode creates a single-use code for the given session token.
+func (s *ProxyServiceServer) GenerateSessionCode(sessionToken string) (code string, ok bool) {
+	code, err := s.singleUseStore.Generate(sessionCodeCacheNamespace, sessionToken, sessionCodeTTL)
+	if err != nil {
+		log.WithError(err).Error("failed to generate proxy session code")
+		return "", false
+	}
+	return code, true
+}
+
 // CheckLLMPolicyLimits is the pre-flight policy gate the proxy calls before
 // forwarding an LLM request upstream. Delegates to the agent-network selector,
 // which scores applicable policies by remaining headroom and returns the
@@ -1536,18 +1552,20 @@ func (s *ProxyServiceServer) GetOIDCURL(ctx context.Context, req *proto.GetOIDCU
 		log.WithContext(ctx).Errorf("failed to get account services: %v", err)
 		return nil, status.Errorf(codes.FailedPrecondition, "get account services: %v", err)
 	}
-	var found bool
+	var matchedService *rpservice.Service
 	for _, service := range services {
 		if service.Domain == redirectURL.Hostname() {
-			found = true
+			matchedService = service
 			break
 		}
 	}
-	if !found {
+	if matchedService == nil {
 		log.WithContext(ctx).Debugf("OIDC redirect URL %q does not match any service domain", redirectURL.Hostname())
 		return nil, status.Errorf(codes.FailedPrecondition, "service not found in store")
 	}

+	useSessionCode := s.proxyManager.ClusterSupportsSessionCode(ctx, matchedService.ProxyCluster)
+
 	provider, err := oidc.NewProvider(ctx, s.oidcConfig.Issuer)
 	if err != nil {
 		log.WithContext(ctx).Errorf("failed to create OIDC provider: %v", err)
@@ -1567,9 +1585,12 @@ func (s *ProxyServiceServer) GetOIDCURL(ctx context.Context, req *proto.GetOIDCU
 		return nil, status.Errorf(codes.Internal, "generate nonce: %v", err)
 	}
 	nonceB64 := base64.URLEncoding.EncodeToString(nonce)
+	if useSessionCode {
+		nonceB64 = sessionCodeNoncePrefix + nonceB64
+	}

 	// Using an HMAC here to avoid redirection state being modified.
-	// State format: base64(redirectURL)|nonce|hmac(redirectURL|nonce)
+	// State format: base64(redirectURL)|[code.]nonce|hmac(redirectURL|nonce)
 	payload := redirectURL.String() + "|" + nonceB64
 	hmacSum := s.generateHMAC(payload)
 	state := fmt.Sprintf("%s|%s|%s", base64.URLEncoding.EncodeToString([]byte(redirectURL.String())), nonceB64, hmacSum)
@@ -1612,15 +1633,12 @@ func (s *ProxyServiceServer) generateHMAC(input string) string {
 	return hex.EncodeToString(mac.Sum(nil))
 }

-// ValidateState validates the state parameter from an OAuth callback.
-// Returns the original redirect URL if valid, or an error if invalid.
-// The HMAC is verified before consuming the PKCE verifier to prevent
-// an attacker from invalidating a legitimate user's auth flow.
-func (s *ProxyServiceServer) ValidateState(state string) (verifier, redirectURL string, err error) {
-	// State format: base64(redirectURL)|nonce|hmac(redirectURL|nonce)
+// ValidateState validates and consumes an OIDC state.
+func (s *ProxyServiceServer) ValidateState(state string) (verifier, redirectURL string, useSessionCode bool, err error) {
+	// State format: base64(redirectURL)|[code.]nonce|hmac(redirectURL|nonce)
 	parts := strings.Split(state, "|")
 	if len(parts) != 3 {
-		return "", "", errors.New("invalid state format")
+		return "", "", false, errors.New("invalid state format")
 	}

 	encodedURL := parts[0]
@@ -1629,7 +1647,7 @@ func (s *ProxyServiceServer) ValidateState(state string) (verifier, redirectURL

 	redirectURLBytes, err := base64.URLEncoding.DecodeString(encodedURL)
 	if err != nil {
-		return "", "", fmt.Errorf("invalid state encoding: %w", err)
+		return "", "", false, fmt.Errorf("invalid state encoding: %w", err)
 	}
 	redirectURL = string(redirectURLBytes)

@@ -1637,16 +1655,17 @@ func (s *ProxyServiceServer) ValidateState(state string) (verifier, redirectURL
 	expectedHMAC := s.generateHMAC(payload)

 	if !hmac.Equal([]byte(providedHMAC), []byte(expectedHMAC)) {
-		return "", "", errors.New("invalid state signature")
+		return "", "", false, errors.New("invalid state signature")
 	}
+	useSessionCode = strings.HasPrefix(nonce, sessionCodeNoncePrefix)

 	// Consume the PKCE verifier only after HMAC validation passes.
 	verifier, ok := s.singleUseStore.LoadAndDelete(state)
 	if !ok {
-		return "", "", errors.New("no verifier for state")
+		return "", "", false, errors.New("no verifier for state")
 	}

-	return verifier, redirectURL, nil
+	return verifier, redirectURL, useSessionCode, nil
 }

 // Denied reasons reported to the proxy when access is refused because of the
@@ -1851,7 +1870,20 @@ func (s *ProxyServiceServer) getAccountServiceByDomain(ctx context.Context, acco
 // ValidateSession validates a session token and checks if the user has access to the domain.
 func (s *ProxyServiceServer) ValidateSession(ctx context.Context, req *proto.ValidateSessionRequest) (*proto.ValidateSessionResponse, error) {
 	domain := req.GetDomain()
-	sessionToken := req.GetSessionToken()
+	sessionToken := req.GetSessionToken() //nolint:staticcheck
+
+	// A one-time code from the OIDC callback is redeemed here for the durable
+	// token, so the token never travels in a redirect URL. The redeemed token
+	// is returned to the proxy (mintedToken) to install as the session cookie.
+	mintedToken := ""
+	if code := req.GetSessionCode(); code != "" {
+		redeemed, found := s.singleUseStore.LoadAndDelete(singleUseCacheKey(sessionCodeCacheNamespace, code))
+		if !found {
+			return deniedSessionResponse("invalid or expired session code"), nil
+		}
+		sessionToken = redeemed
+		mintedToken = redeemed
+	}

 	if domain == "" || sessionToken == "" {
 		return deniedSessionResponse("missing domain or session_token"), nil
@@ -1924,6 +1956,7 @@ func (s *ProxyServiceServer) ValidateSession(ctx context.Context, req *proto.Val
 		UserEmail:      user.Email,
 		PeerGroupIds:   groupIDs,
 		PeerGroupNames: groupNames,
+		SessionToken:   mintedToken,
 	}, nil
 }

@@ -313,7 +313,7 @@ func TestValidateState_RejectsOldTwoPartFormat(t *testing.T) {
 	err := s.singleUseStore.Store("base64url|hmac", "test", 10*time.Minute)
 	require.NoError(t, err)

-	_, _, err = s.ValidateState("base64url|hmac")
+	_, _, _, err = s.ValidateState("base64url|hmac")
 	require.Error(t, err)
 	assert.Contains(t, err.Error(), "invalid state format")
 }
@@ -385,11 +385,35 @@ func TestValidateState_RejectsInvalidHMAC(t *testing.T) {
 	err := s.singleUseStore.Store("dGVzdA==|nonce|wrong-hmac", "test", 10*time.Minute)
 	require.NoError(t, err)

-	_, _, err = s.ValidateState("dGVzdA==|nonce|wrong-hmac")
+	_, _, _, err = s.ValidateState("dGVzdA==|nonce|wrong-hmac")
 	require.Error(t, err)
 	assert.Contains(t, err.Error(), "invalid state signature")
 }

+func TestSessionCodeCannotConsumeOIDCState(t *testing.T) {
+	const verifier = "pkce-verifier"
+
+	store := NewSingleUseStore(context.Background(), testCacheStore(t))
+	server := &ProxyServiceServer{
+		oidcConfig: ProxyOIDCConfig{
+			HMACKey: []byte("test-hmac-key"),
+		},
+		singleUseStore: store,
+	}
+	state := generateState(server, "https://service.example.com/callback")
+	require.NoError(t, store.Store(state, verifier, time.Minute))
+
+	response, err := server.ValidateSession(context.Background(), &proto.ValidateSessionRequest{
+		SessionCode: state,
+	})
+	require.NoError(t, err)
+	assert.False(t, response.GetValid())
+
+	gotVerifier, _, _, err := server.ValidateState(state)
+	require.NoError(t, err)
+	assert.Equal(t, verifier, gotVerifier)
+}
+
 func TestSendServiceUpdateToCluster_FiltersOnCapability(t *testing.T) {
 	tokenStore := NewOneTimeTokenStore(context.Background(), testCacheStore(t))

@@ -2,6 +2,8 @@ package grpc

 import (
 	"context"
+	"crypto/rand"
+	"encoding/base64"
 	"fmt"
 	"time"

@@ -33,6 +35,24 @@ func (s *SingleUseStore) Store(key, value string, ttl time.Duration) error {
 	return nil
 }

+// Generate stores a value under a namespaced random key and returns the random key.
+func (s *SingleUseStore) Generate(namespace, value string, ttl time.Duration) (string, error) {
+	buf := make([]byte, 32)
+	if _, err := rand.Read(buf); err != nil {
+		return "", fmt.Errorf("generate single-use key: %w", err)
+	}
+
+	key := base64.RawURLEncoding.EncodeToString(buf)
+	if err := s.Store(singleUseCacheKey(namespace, key), value, ttl); err != nil {
+		return "", err
+	}
+	return key, nil
+}
+
+func singleUseCacheKey(namespace, key string) string {
+	return namespace + ":" + key
+}
+
 // LoadAndDelete retrieves and removes the value for a key.
 func (s *SingleUseStore) LoadAndDelete(key string) (string, bool) {
 	value, found, err := s.cache.GetDel(s.ctx, key)
@@ -83,3 +83,40 @@ func TestSingleUseStoreLoadAndDelete(t *testing.T) {
 		}
 	})
 }
+
+func TestSingleUseStore_GenerateAndConsumeOnce(t *testing.T) {
+	const namespace = "test"
+	s := NewSingleUseStore(context.Background(), testCacheStore(t))
+
+	key, err := s.Generate(namespace, "the-value", time.Minute)
+	if err != nil {
+		t.Fatalf("generate: %v", err)
+	}
+	if key == "" || key == "the-value" {
+		t.Fatalf("unexpected key %q", key)
+	}
+
+	value, found := s.LoadAndDelete(singleUseCacheKey(namespace, key))
+	if !found || value != "the-value" {
+		t.Fatalf("expected to load the stored value, got %q found=%v", value, found)
+	}
+
+	if _, found := s.LoadAndDelete(singleUseCacheKey(namespace, key)); found {
+		t.Fatal("value must be consumed on first LoadAndDelete")
+	}
+}
+
+func TestSingleUseStore_GenerateUniqueKeys(t *testing.T) {
+	s := NewSingleUseStore(context.Background(), testCacheStore(t))
+	a, err := s.Generate("test", "v", time.Minute)
+	if err != nil {
+		t.Fatalf("generate a: %v", err)
+	}
+	b, err := s.Generate("test", "v", time.Minute)
+	if err != nil {
+		t.Fatalf("generate b: %v", err)
+	}
+	if a == b {
+		t.Fatal("generated keys must be distinct")
+	}
+}
@@ -634,6 +634,10 @@ func (m *testValidateSessionProxyManager) ClusterSupportsPrivate(_ context.Conte
 	return nil
 }

+func (m *testValidateSessionProxyManager) ClusterSupportsSessionCode(_ context.Context, _ string) bool {
+	return false
+}
+
 type testValidateSessionUsersManager struct {
 	store store.Store
 }
@@ -662,3 +666,47 @@ func (m *testValidateSessionUsersManager) GetUserWithGroups(ctx context.Context,
 	}
 	return user, groups, nil
 }
+
+func TestValidateSession_RedeemsSessionCode(t *testing.T) {
+	setup := setupValidateSessionTest(t)
+	defer setup.cleanup()
+
+	proxy, err := setup.store.GetServiceByID(context.Background(), store.LockingStrengthNone, "testAccountId", "testProxyId")
+	require.NoError(t, err)
+
+	token := createSessionToken(t, proxy.SessionPrivateKey, "allowedUserId", "test-proxy.example.com")
+	code, ok := setup.proxyService.GenerateSessionCode(token)
+	require.True(t, ok)
+	require.NotEqual(t, token, code, "code must not be the token itself")
+
+	resp, err := setup.proxyService.ValidateSession(context.Background(), &proto.ValidateSessionRequest{
+		Domain:      "test-proxy.example.com",
+		SessionCode: code,
+	})
+	require.NoError(t, err)
+	assert.True(t, resp.Valid, "redeemed code should authorize the user")
+	assert.Equal(t, "allowedUserId", resp.UserId)
+	assert.Equal(t, token, resp.GetSessionToken(), "response must carry the durable token for the cookie")
+
+	// Single-use: the same code must not redeem again.
+	resp2, err := setup.proxyService.ValidateSession(context.Background(), &proto.ValidateSessionRequest{
+		Domain:      "test-proxy.example.com",
+		SessionCode: code,
+	})
+	require.NoError(t, err)
+	assert.False(t, resp2.Valid, "a consumed code must be rejected")
+	assert.Empty(t, resp2.GetSessionToken())
+}
+
+func TestValidateSession_InvalidSessionCode(t *testing.T) {
+	setup := setupValidateSessionTest(t)
+	defer setup.cleanup()
+
+	resp, err := setup.proxyService.ValidateSession(context.Background(), &proto.ValidateSessionRequest{
+		Domain:      "test-proxy.example.com",
+		SessionCode: "does-not-exist",
+	})
+	require.NoError(t, err)
+	assert.False(t, resp.Valid)
+	assert.Empty(t, resp.GetSessionToken())
+}
@@ -59,7 +59,7 @@ func (h *AuthCallbackHandler) handleCallback(w http.ResponseWriter, r *http.Requ

 	state := r.URL.Query().Get("state")

-	codeVerifier, originalURL, err := h.proxyService.ValidateState(state)
+	codeVerifier, originalURL, useSessionCode, err := h.proxyService.ValidateState(state)
 	if err != nil {
 		log.WithError(err).Error("OAuth callback state validation failed")
 		http.Error(w, "Invalid state parameter", http.StatusBadRequest)
@@ -119,10 +119,19 @@ func (h *AuthCallbackHandler) handleCallback(w http.ResponseWriter, r *http.Requ
 	redirectURL.Scheme = "https"

 	query := redirectURL.Query()
-	query.Set("session_token", sessionToken)
+	if useSessionCode {
+		code, ok := h.proxyService.GenerateSessionCode(sessionToken)
+		if !ok {
+			http.Error(w, "Failed to create session", http.StatusInternalServerError)
+			return
+		}
+		query.Set("session_code", code)
+	} else {
+		query.Set("session_token", sessionToken)
+	}
 	redirectURL.RawQuery = query.Encode()

-	log.WithField("redirect", redirectURL.Host).Debug("OAuth callback: redirecting user with session token")
+	log.WithField("redirect", redirectURL.Host).Debug("OAuth callback: redirecting user to proxy")
 	http.Redirect(w, r, redirectURL.String(), http.StatusFound)
 }

@@ -181,6 +181,10 @@ func (m *testAccessLogManager) GetAllAccessLogs(_ context.Context, _, _ string,
 }

 func setupAuthCallbackTest(t *testing.T) *testSetup {
+	return setupAuthCallbackTestWithProxyManager(t, testSessionCodeManager{})
+}
+
+func setupAuthCallbackTestWithProxyManager(t *testing.T, proxyManager nbproxy.Manager) *testSetup {
 	t.Helper()

 	ctx := context.Background()
@@ -217,7 +221,7 @@ func setupAuthCallbackTest(t *testing.T) *testSetup {
 		nil,
 		usersManager,
 		nil,
-		nil,
+		proxyManager,
 		nil,
 	)

@@ -242,6 +246,15 @@ func setupAuthCallbackTest(t *testing.T) *testSetup {
 	}
 }

+type testSessionCodeManager struct {
+	nbproxy.Manager
+	supported bool
+}
+
+func (m testSessionCodeManager) ClusterSupportsSessionCode(_ context.Context, _ string) bool {
+	return m.supported
+}
+
 func createTestReverseProxies(t *testing.T, ctx context.Context, testStore store.Store) {
 	t.Helper()

@@ -252,10 +265,11 @@ func createTestReverseProxies(t *testing.T, ctx context.Context, testStore store
 	privKey := base64.StdEncoding.EncodeToString(priv)

 	testProxy := &service.Service{
-		ID:        "testProxyId",
-		AccountID: "testAccountId",
-		Name:      "Test Proxy",
-		Domain:    "test-proxy.example.com",
+		ID:           "testProxyId",
+		AccountID:    "testAccountId",
+		Name:         "Test Proxy",
+		Domain:       "test-proxy.example.com",
+		ProxyCluster: "cluster.example.com",
 		Targets: []*service.Target{{
 			Path:       strPtr("/"),
 			Host:       "localhost",
@@ -512,29 +526,56 @@ func createTestState(t *testing.T, ps *nbgrpc.ProxyServiceServer, redirectURL st
 }

 func TestAuthCallback_UserAllowedToLogin(t *testing.T) {
-	setup := setupAuthCallbackTest(t)
-	defer setup.cleanup()
+	tests := []struct {
+		name        string
+		manager     nbproxy.Manager
+		wantParam   string
+		absentParam string
+	}{
+		{name: "legacy proxy", manager: testSessionCodeManager{}, wantParam: "session_token", absentParam: "session_code"},
+		{name: "compatible proxy", manager: testSessionCodeManager{supported: true}, wantParam: "session_code", absentParam: "session_token"},
+	}

-	setup.oidcServer.tokenSubject = "allowedUserId"
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			setup := setupAuthCallbackTestWithProxyManager(t, tt.manager)
+			defer setup.cleanup()

-	state := createTestState(t, setup.proxyService, "https://test-proxy.example.com/dashboard")
+			setup.oidcServer.tokenSubject = "allowedUserId"
+			state := createTestState(t, setup.proxyService, "https://test-proxy.example.com/dashboard")
+			req := httptest.NewRequest(http.MethodGet, "/reverse-proxy/callback?code=test-auth-code&state="+url.QueryEscape(state), nil)
+			rec := httptest.NewRecorder()
+			setup.router.ServeHTTP(rec, req)
+			require.Equal(t, http.StatusFound, rec.Code)

-	req := httptest.NewRequest(http.MethodGet, "/reverse-proxy/callback?code=test-auth-code&state="+url.QueryEscape(state), nil)
-	rec := httptest.NewRecorder()
+			location, err := url.Parse(rec.Header().Get("Location"))
+			require.NoError(t, err)
+			require.Equal(t, "test-proxy.example.com", location.Host)
+			require.NotEmpty(t, location.Query().Get(tt.wantParam))
+			require.Empty(t, location.Query().Get(tt.absentParam))
+			require.Empty(t, location.Query().Get("error"))

-	setup.router.ServeHTTP(rec, req)
+			if tt.wantParam == "session_code" {
+				code := location.Query().Get("session_code")
+				response, err := setup.proxyService.ValidateSession(context.Background(), &proto.ValidateSessionRequest{
+					Domain:      location.Hostname(),
+					SessionCode: code,
+				})
+				require.NoError(t, err)
+				require.True(t, response.GetValid())
+				require.NotEmpty(t, response.GetSessionToken())
+				require.NotEqual(t, code, response.GetSessionToken())

-	require.Equal(t, http.StatusFound, rec.Code)
-
-	location := rec.Header().Get("Location")
-	require.NotEmpty(t, location)
-
-	parsedLocation, err := url.Parse(location)
-	require.NoError(t, err)
-
-	require.Equal(t, "test-proxy.example.com", parsedLocation.Host)
-	require.NotEmpty(t, parsedLocation.Query().Get("session_token"), "Should include session token")
-	require.Empty(t, parsedLocation.Query().Get("error"), "Should not have error parameter")
+				replayed, err := setup.proxyService.ValidateSession(context.Background(), &proto.ValidateSessionRequest{
+					Domain:      location.Hostname(),
+					SessionCode: code,
+				})
+				require.NoError(t, err)
+				require.False(t, replayed.GetValid())
+				require.Empty(t, replayed.GetSessionToken())
+			}
+		})
+	}
 }

 // TestAuthCallback_UserDeniedByAccountStatus asserts that a user whose account
@@ -367,6 +367,21 @@ func (s *SqlStore) GetClusterSupportsCrowdSec(ctx context.Context, clusterAddr s
 	return s.getClusterUnanimousCapability(ctx, clusterAddr, "supports_crowdsec")
 }

+// GetActiveProxyVersions returns every active proxy version in a cluster.
+func (s *SqlStore) GetActiveProxyVersions(ctx context.Context, clusterAddr string) ([]string, error) {
+	var versions []string
+	err := s.db.WithContext(ctx).
+		Model(&proxy.Proxy{}).
+		Where("LOWER(cluster_address) = LOWER(?) AND status = ? AND last_seen > ?",
+			clusterAddr, proxy.StatusConnected, time.Now().Add(-proxyActiveThreshold)).
+		Pluck("version", &versions).Error
+	if err != nil {
+		log.WithContext(ctx).Errorf("failed to get active proxy versions for %s: %v", clusterAddr, err)
+		return nil, status.Errorf(status.Internal, "get active proxy versions")
+	}
+	return versions, nil
+}
+
 // getClusterUnanimousCapability returns an aggregated boolean capability
 // requiring all active proxies in the cluster to report true.
 func (s *SqlStore) getClusterUnanimousCapability(ctx context.Context, clusterAddr, column string) *bool {
@@ -337,6 +337,7 @@ type Store interface {
 	GetClusterRequireSubdomain(ctx context.Context, clusterAddr string) *bool
 	GetClusterSupportsCrowdSec(ctx context.Context, clusterAddr string) *bool
 	GetClusterSupportsPrivate(ctx context.Context, clusterAddr string) *bool
+	GetActiveProxyVersions(ctx context.Context, clusterAddr string) ([]string, error)
 	CleanupStaleProxies(ctx context.Context, inactivityDuration time.Duration) error
 	GetAllProxies(ctx context.Context) ([]*proxy.Proxy, error)
 	DisconnectAllProxies(ctx context.Context) (int64, error)
@@ -1539,6 +1539,21 @@ func (mr *MockStoreMockRecorder) GetActiveProxyClusterAddressesForAccount(ctx, a
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetActiveProxyClusterAddressesForAccount", reflect.TypeOf((*MockStore)(nil).GetActiveProxyClusterAddressesForAccount), ctx, accountID)
 }

+// GetActiveProxyVersions mocks base method.
+func (m *MockStore) GetActiveProxyVersions(ctx context.Context, clusterAddr string) ([]string, error) {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "GetActiveProxyVersions", ctx, clusterAddr)
+	ret0, _ := ret[0].([]string)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// GetActiveProxyVersions indicates an expected call of GetActiveProxyVersions.
+func (mr *MockStoreMockRecorder) GetActiveProxyVersions(ctx, clusterAddr any) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetActiveProxyVersions", reflect.TypeOf((*MockStore)(nil).GetActiveProxyVersions), ctx, clusterAddr)
+}
+
 // GetAgentNetworkAccessLogSessions mocks base method.
 func (m *MockStore) GetAgentNetworkAccessLogSessions(ctx context.Context, lockStrength LockingStrength, accountID string, filter types.AgentNetworkAccessLogFilter) ([]*types.AgentNetworkAccessLogSession, int64, error) {
 	m.ctrl.T.Helper()
@@ -46,7 +46,7 @@ type Scheme interface {
 	// an authenticated user. An empty token indicates an unauthenticated
 	// request; optionally, promptData may be returned for the login UI.
 	// An error indicates an infrastructure failure (e.g. gRPC unavailable).
-	Authenticate(*http.Request) (token string, promptData string, err error)
+	Authenticate(*http.Request) (token, promptData string, err error)
 }

 // DomainConfig holds the authentication and restriction settings for a protected domain.
@@ -77,6 +77,8 @@ type validationResult struct {
 	// Groups for tokens minted before names were embedded; the consumer
 	// falls back to ids for missing positions.
 	GroupNames []string
+	// MintedToken is the session token issued when a one-time code is redeemed.
+	MintedToken string
 }

 // Middleware applies per-domain authentication and IP restriction checks.
@@ -581,7 +583,8 @@ func (mw *Middleware) authenticateWithSchemes(w http.ResponseWriter, r *http.Req
 // handleAuthenticatedToken validates the token, handles denied access, and on
 // success sets a session cookie and redirects to the original URL.
 func (mw *Middleware) handleAuthenticatedToken(w http.ResponseWriter, r *http.Request, host, token string, config DomainConfig, scheme Scheme) {
-	result, err := mw.validateSessionToken(r.Context(), host, token, config.SessionPublicKey, scheme.Type())
+	isCode := scheme.Type() == auth.MethodOIDC && r.URL.Query().Get("session_code") != ""
+	result, err := mw.validateSessionToken(r.Context(), host, token, isCode, config.SessionPublicKey, scheme.Type())
 	if err != nil {
 		if cd := proxy.CapturedDataFromContext(r.Context()); cd != nil {
 			cd.SetOrigin(proxy.OriginAuth)
@@ -612,7 +615,13 @@ func (mw *Middleware) handleAuthenticatedToken(w http.ResponseWriter, r *http.Re
 		return
 	}

-	setSessionCookie(w, token, config.SessionExpiration)
+	// When a code was redeemed, the cookie must hold the durable token the
+	// server returned, not the single-use code.
+	cookieValue := token
+	if result.MintedToken != "" {
+		cookieValue = result.MintedToken
+	}
+	setSessionCookie(w, cookieValue, config.SessionExpiration)

 	// Redirect instead of forwarding the auth POST to the backend.
 	// The browser will follow with a GET carrying the new session cookie.
@@ -652,7 +661,7 @@ func wasCredentialSubmitted(r *http.Request, method auth.Method) bool {
 	case auth.MethodPassword:
 		return credentialFormValue(r, passwordFormId) != ""
 	case auth.MethodOIDC:
-		return r.URL.Query().Get("session_token") != ""
+		return r.URL.Query().Get("session_token") != "" || r.URL.Query().Get("session_code") != ""
 	}
 	return false
 }
@@ -706,12 +715,15 @@ func (mw *Middleware) RemoveDomain(domain string) {

 // validateSessionToken validates a session token. OIDC tokens with a configured
 // validator go through gRPC for group access checks; other methods validate locally.
-func (mw *Middleware) validateSessionToken(ctx context.Context, host, token string, publicKey ed25519.PublicKey, method auth.Method) (*validationResult, error) {
+func (mw *Middleware) validateSessionToken(ctx context.Context, host, token string, isCode bool, publicKey ed25519.PublicKey, method auth.Method) (*validationResult, error) {
 	if method == auth.MethodOIDC && mw.sessionValidator != nil {
-		resp, err := mw.sessionValidator.ValidateSession(ctx, &proto.ValidateSessionRequest{
-			Domain:       host,
-			SessionToken: token,
-		})
+		req := &proto.ValidateSessionRequest{Domain: host}
+		if isCode {
+			req.SessionCode = token
+		} else {
+			req.SessionToken = token //nolint:staticcheck
+		}
+		resp, err := mw.sessionValidator.ValidateSession(ctx, req)
 		if err != nil {
 			return nil, fmt.Errorf("%w: %w", errValidationUnavailable, err)
 		}
@@ -729,11 +741,12 @@ func (mw *Middleware) validateSessionToken(ctx context.Context, host, token stri
 			}, nil
 		}
 		return &validationResult{
-			UserID:     resp.UserId,
-			UserEmail:  resp.GetUserEmail(),
-			Valid:      true,
-			Groups:     resp.GetPeerGroupIds(),
-			GroupNames: resp.GetPeerGroupNames(),
+			UserID:      resp.UserId,
+			UserEmail:   resp.GetUserEmail(),
+			Valid:       true,
+			Groups:      resp.GetPeerGroupIds(),
+			GroupNames:  resp.GetPeerGroupNames(),
+			MintedToken: resp.GetSessionToken(),
 		}, nil
 	}

@@ -788,14 +801,16 @@ func sessionGroupsAllowed(allowed map[string]struct{}, method auth.Method, group
 	}
 }

-// stripSessionTokenParam returns the request URI with the session_token query
-// parameter removed so it doesn't linger in the browser's address bar or history.
+// stripSessionTokenParam returns the request URI with the session hand-off
+// query parameters removed so they don't linger in the browser's address bar
+// or history.
 func stripSessionTokenParam(u *url.URL) string {
 	q := u.Query()
-	if !q.Has("session_token") {
+	if !q.Has("session_token") && !q.Has("session_code") {
 		return u.RequestURI()
 	}
 	q.Del("session_token")
+	q.Del("session_code")
 	clean := *u
 	clean.RawQuery = q.Encode()
 	return clean.RequestURI()
@@ -783,6 +783,12 @@ func TestWasCredentialSubmitted(t *testing.T) {
 			query:    url.Values{"session_token": {"abc123"}},
 			expected: true,
 		},
+		{
+			name:     "OIDC code in query",
+			method:   auth.MethodOIDC,
+			query:    url.Values{"session_code": {"abc123"}},
+			expected: true,
+		},
 		{
 			name:     "OIDC token not in query",
 			method:   auth.MethodOIDC,
@@ -1571,3 +1577,23 @@ func TestProtect_TunnelPeerFastPath_TakesPathWithInboundMarker(t *testing.T) {
 	assert.Equal(t, http.StatusOK, rec.Code,
 		"a successful tunnel-peer validation must forward to the next handler")
 }
+
+func TestStripSessionTokenParam(t *testing.T) {
+	cases := []struct {
+		name string
+		in   string
+		want string
+	}{
+		{"strips session_token", "https://ex.com/p?a=1&session_token=tok", "/p?a=1"},
+		{"strips session_code", "https://ex.com/p?a=1&session_code=code", "/p?a=1"},
+		{"strips both", "https://ex.com/p?session_token=tok&session_code=code&a=1", "/p?a=1"},
+		{"no-op when absent", "https://ex.com/p?a=1", "/p?a=1"},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			u, err := url.Parse(tc.in)
+			require.NoError(t, err)
+			assert.Equal(t, tc.want, stripSessionTokenParam(u))
+		})
+	}
+}
@@ -40,9 +40,14 @@ func (OIDC) Type() auth.Method {

 // Authenticate checks for an OIDC session token or obtains the OIDC redirect URL.
 func (o OIDC) Authenticate(r *http.Request) (string, string, error) {
-	// Check for the session_token query param (from OIDC redirects).
-	// The management server passes the token in the URL because it cannot set
-	// cookies for the proxy's domain (cookies are domain-scoped per RFC 6265).
+	// Check for the session credential returned by the OIDC callback. The management
+	// server passes it in the URL because it cannot set a cookie for the proxy's
+	// domain (cookies are domain-scoped per RFC 6265). The current flow uses a
+	// single-use session_code to keep the durable token out of the URL.
+	// session_token remains supported for backward compatibility.
+	if code := r.URL.Query().Get("session_code"); code != "" {
+		return code, "", nil
+	}
 	if token := r.URL.Query().Get("session_token"); token != "" {
 		return token, "", nil
 	}
@@ -721,12 +721,13 @@ func stripSessionCookie(r *httputil.ProxyRequest) {
 	}
 }

-// stripSessionTokenQuery removes the OIDC session_token query parameter from
-// the outgoing URL to prevent credential leakage to backends.
+// stripSessionTokenQuery removes the OIDC session hand-off query parameters
+// from the outgoing URL to prevent credential leakage to backends.
 func stripSessionTokenQuery(r *httputil.ProxyRequest) {
 	q := r.Out.URL.Query()
-	if q.Has("session_token") {
+	if q.Has("session_token") || q.Has("session_code") {
 		q.Del("session_token")
+		q.Del("session_code")
 		r.Out.URL.RawQuery = q.Encode()
 	}
 }
@@ -131,7 +131,7 @@ func setupIntegrationTest(t *testing.T) *integrationTestSetup {
 		HMACKey:  []byte("test-hmac-key"),
 	}

-	proxyManager := &testProxyManager{}
+	proxyManager := &testProxyManager{supportsSessionCode: true}

 	proxyService := nbgrpc.NewProxyServiceServer(
 		&testAccessLogManager{},
@@ -202,7 +202,9 @@ func (m *testAccessLogManager) GetAllAccessLogs(_ context.Context, _, _ string,
 }

 // testProxyManager is a mock implementation of proxy.Manager for testing.
-type testProxyManager struct{}
+type testProxyManager struct {
+	supportsSessionCode bool
+}

 func (m *testProxyManager) Connect(_ context.Context, proxyID, sessionID, _, _, _ string, _ *string, _ *nbproxy.Capabilities) (*nbproxy.Proxy, error) {
 	return &nbproxy.Proxy{ID: proxyID, SessionID: sessionID, Status: nbproxy.StatusConnected}, nil
@@ -244,6 +246,10 @@ func (m *testProxyManager) ClusterSupportsPrivate(_ context.Context, _ string) *
 	return nil
 }

+func (m *testProxyManager) ClusterSupportsSessionCode(_ context.Context, _ string) bool {
+	return m.supportsSessionCode
+}
+
 func (m *testProxyManager) CleanupStale(_ context.Context, _ time.Duration) error {
 	return nil
 }
@@ -181,6 +181,7 @@ func ServeAccessDeniedPage(w http.ResponseWriter, r *http.Request, code int, tit
 func stripAuthParams(u *url.URL) string {
 	q := u.Query()
 	q.Del("session_token")
+	q.Del("session_code")
 	q.Del("error")
 	q.Del("error_description")
 	clean := *u
@@ -2265,8 +2265,11 @@ type ValidateSessionRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields

-	Domain       string `protobuf:"bytes,1,opt,name=domain,proto3" json:"domain,omitempty"`
+	Domain string `protobuf:"bytes,1,opt,name=domain,proto3" json:"domain,omitempty"`
+	// Deprecated: Do not use.
 	SessionToken string `protobuf:"bytes,2,opt,name=session_token,json=sessionToken,proto3" json:"session_token,omitempty"`
+	// session_code is a short-lived, single-use code exchanged for a session token.
+	SessionCode string `protobuf:"bytes,3,opt,name=session_code,json=sessionCode,proto3" json:"session_code,omitempty"`
 }

 func (x *ValidateSessionRequest) Reset() {
@@ -2308,6 +2311,7 @@ func (x *ValidateSessionRequest) GetDomain() string {
 	return ""
 }

+// Deprecated: Do not use.
 func (x *ValidateSessionRequest) GetSessionToken() string {
 	if x != nil {
 		return x.SessionToken
@@ -2315,6 +2319,13 @@ func (x *ValidateSessionRequest) GetSessionToken() string {
 	return ""
 }

+func (x *ValidateSessionRequest) GetSessionCode() string {
+	if x != nil {
+		return x.SessionCode
+	}
+	return ""
+}
+
 type ValidateSessionResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2333,6 +2344,8 @@ type ValidateSessionResponse struct {
 	// Stamped onto upstream requests as X-NetBird-Groups so downstream
 	// services can read names rather than opaque ids.
 	PeerGroupNames []string `protobuf:"bytes,6,rep,name=peer_group_names,json=peerGroupNames,proto3" json:"peer_group_names,omitempty"`
+	// session_token contains the durable token issued when session_code is redeemed.
+	SessionToken string `protobuf:"bytes,7,opt,name=session_token,json=sessionToken,proto3" json:"session_token,omitempty"`
 }

 func (x *ValidateSessionResponse) Reset() {
@@ -2409,6 +2422,13 @@ func (x *ValidateSessionResponse) GetPeerGroupNames() []string {
 	return nil
 }

+func (x *ValidateSessionResponse) GetSessionToken() string {
+	if x != nil {
+		return x.SessionToken
+	}
+	return ""
+}
+
 // ValidateTunnelPeerRequest carries the inbound peer's tunnel IP and the
 // service domain whose group requirements should gate access. The calling
 // account is inferred from the proxy's gRPC metadata (ProxyToken).
@@ -3519,223 +3539,228 @@ var file_proxy_service_proto_rawDesc = []byte{
 	0x09, 0x52, 0x0b, 0x72, 0x65, 0x64, 0x69, 0x72, 0x65, 0x63, 0x74, 0x55, 0x72, 0x6c, 0x22, 0x26,
 	0x0a, 0x12, 0x47, 0x65, 0x74, 0x4f, 0x49, 0x44, 0x43, 0x55, 0x52, 0x4c, 0x52, 0x65, 0x73, 0x70,
 	0x6f, 0x6e, 0x73, 0x65, 0x12, 0x10, 0x0a, 0x03, 0x75, 0x72, 0x6c, 0x18, 0x01, 0x20, 0x01, 0x28,
-	0x09, 0x52, 0x03, 0x75, 0x72, 0x6c, 0x22, 0x55, 0x0a, 0x16, 0x56, 0x61, 0x6c, 0x69, 0x64, 0x61,
+	0x09, 0x52, 0x03, 0x75, 0x72, 0x6c, 0x22, 0x7c, 0x0a, 0x16, 0x56, 0x61, 0x6c, 0x69, 0x64, 0x61,
 	0x74, 0x65, 0x53, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74,
 	0x12, 0x16, 0x0a, 0x06, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09,
-	0x52, 0x06, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x12, 0x23, 0x0a, 0x0d, 0x73, 0x65, 0x73, 0x73,
-	0x69, 0x6f, 0x6e, 0x5f, 0x74, 0x6f, 0x6b, 0x65, 0x6e, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52,
-	0x0c, 0x73, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x54, 0x6f, 0x6b, 0x65, 0x6e, 0x22, 0xdc, 0x01,
-	0x0a, 0x17, 0x56, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74, 0x65, 0x53, 0x65, 0x73, 0x73, 0x69, 0x6f,
-	0x6e, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c,
+	0x52, 0x06, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x12, 0x27, 0x0a, 0x0d, 0x73, 0x65, 0x73, 0x73,
+	0x69, 0x6f, 0x6e, 0x5f, 0x74, 0x6f, 0x6b, 0x65, 0x6e, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x42,
+	0x02, 0x18, 0x01, 0x52, 0x0c, 0x73, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x54, 0x6f, 0x6b, 0x65,
+	0x6e, 0x12, 0x21, 0x0a, 0x0c, 0x73, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x5f, 0x63, 0x6f, 0x64,
+	0x65, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0b, 0x73, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e,
+	0x43, 0x6f, 0x64, 0x65, 0x22, 0x81, 0x02, 0x0a, 0x17, 0x56, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74,
+	0x65, 0x53, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65,
+	0x12, 0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x69, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x08, 0x52,
+	0x05, 0x76, 0x61, 0x6c, 0x69, 0x64, 0x12, 0x17, 0x0a, 0x07, 0x75, 0x73, 0x65, 0x72, 0x5f, 0x69,
+	0x64, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x06, 0x75, 0x73, 0x65, 0x72, 0x49, 0x64, 0x12,
+	0x1d, 0x0a, 0x0a, 0x75, 0x73, 0x65, 0x72, 0x5f, 0x65, 0x6d, 0x61, 0x69, 0x6c, 0x18, 0x03, 0x20,
+	0x01, 0x28, 0x09, 0x52, 0x09, 0x75, 0x73, 0x65, 0x72, 0x45, 0x6d, 0x61, 0x69, 0x6c, 0x12, 0x23,
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 }

 var (
@@ -363,7 +363,9 @@ message GetOIDCURLResponse {

 message ValidateSessionRequest {
  string domain = 1;
-  string session_token = 2;
+  string session_token = 2 [deprecated = true];
+  // session_code is a short-lived, single-use code exchanged for a session token.
+  string session_code = 3;
 }

 message ValidateSessionResponse {
@@ -380,6 +382,8 @@ message ValidateSessionResponse {
  // Stamped onto upstream requests as X-NetBird-Groups so downstream
  // services can read names rather than opaque ids.
  repeated string peer_group_names = 6;
+  // session_token contains the durable token issued when session_code is redeemed.
+  string session_token = 7;
 }

 // ValidateTunnelPeerRequest carries the inbound peer's tunnel IP and the
@@ -506,4 +510,3 @@ message RecordLLMUsageRequest {

 message RecordLLMUsageResponse {
 }
-