K8s: use contexthandler in standalone handler chain (#90102)

pkg/api/common_test.go

@@ -189,7 +189,6 @@ func getContextHandler(t *testing.T, cfg *setting.Cfg) *contexthandler.ContextHa
 	return contexthandler.ProvideService(
 		cfg,
 		tracing.InitializeTracerForTest(),
-		featuremgmt.WithFeatures(),
 		&authntest.FakeService{ExpectedIdentity: &authn.Identity{ID: authn.AnonymousNamespaceID, SessionToken: &usertoken.UserToken{}}},
 	)
 }

pkg/apimachinery/identity/requester.go

@@ -43,6 +43,9 @@ type Requester interface {
 	GetOrgName() string
 	// GetAuthID returns external id for entity.
 	GetAuthID() string
+	// GetAllowedKubernetesNamespace returns either "*" or the single namespace this requester has access to
+	// An empty value means the implementation has not specified a kubernetes namespace.
+	GetAllowedKubernetesNamespace() string
 	// GetAuthenticatedBy returns the authentication method used to authenticate the entity.
 	GetAuthenticatedBy() string
 	// IsAuthenticatedBy returns true if entity was authenticated by any of supplied providers.

pkg/apimachinery/identity/static.go

@@ -22,6 +22,7 @@ type StaticRequester struct {
 	EmailVerified              bool
 	AuthID                     string
 	AuthenticatedBy            string
+	AllowedKubernetesNamespace string
 	IsGrafanaAdmin             bool
 	// Permissions grouped by orgID and actions
 	Permissions map[int64]map[string][]string
@@ -123,6 +124,10 @@ func (u *StaticRequester) GetAuthID() string {
 	return u.AuthID
 }
 
+func (u *StaticRequester) GetAllowedKubernetesNamespace() string {
+	return u.AllowedKubernetesNamespace
+}
+
 func (u *StaticRequester) GetAuthenticatedBy() string {
 	return u.AuthenticatedBy
 }

pkg/apiserver/endpoints/filters/requester.go

@@ -39,7 +39,10 @@ func WithRequester(handler http.Handler) http.Handler {
 						Name:      info.GetName(),
 						Login:     info.GetName(),
 						OrgRole:   identity.RoleAdmin,
+
 						IsGrafanaAdmin:             true,
+						AllowedKubernetesNamespace: "default",
+
 						Permissions: map[int64]map[string][]string{
 							orgId: {
 								"*": {"*"}, // all resources, all scopes

pkg/cmd/grafana/apiserver/cmd.go

@@ -74,15 +74,15 @@ func newCommandStartExampleAPIServer(o *APIServerOptions, stopCh <-chan struct{}
 				return err
 			}
 
-			config, err := o.Config()
-			if err != nil {
-				return err
-			}
-
 			if o.Options.TracingOptions.TracingService != nil {
 				tracer.InitTracer(o.Options.TracingOptions.TracingService)
 			}
 
+			config, err := o.Config(tracer)
+			if err != nil {
+				return err
+			}
+
 			defer o.factory.Shutdown()
 
 			if err := o.RunAPIServer(config, stopCh); err != nil {

pkg/cmd/grafana/apiserver/server.go

@@ -76,7 +76,7 @@ func (o *APIServerOptions) loadAPIGroupBuilders(ctx context.Context, tracer trac
 	return nil
 }
 
-func (o *APIServerOptions) Config() (*genericapiserver.RecommendedConfig, error) {
+func (o *APIServerOptions) Config(tracer tracing.Tracer) (*genericapiserver.RecommendedConfig, error) {
 	if err := o.Options.RecommendedOptions.SecureServing.MaybeDefaultWithSelfSignedCerts(
 		"localhost", o.AlternateDNS, []net.IP{netutils.ParseIPSloppy("127.0.0.1")},
 	); err != nil {
@@ -122,6 +122,7 @@ func (o *APIServerOptions) Config() (*genericapiserver.RecommendedConfig, error)
 		setting.BuildVersion,
 		setting.BuildCommit,
 		setting.BuildBranch,
+		o.factory.GetOptionalMiddlewares(tracer)...,
 	)
 	return serverConfig, err
 }

pkg/middleware/auth_test.go

@@ -26,7 +26,7 @@ import (
 )
 
 func setupAuthMiddlewareTest(t *testing.T, identity *authn.Identity, authErr error) *contexthandler.ContextHandler {
-	return contexthandler.ProvideService(setting.NewCfg(), tracing.InitializeTracerForTest(), featuremgmt.WithFeatures(), &authntest.FakeService{
+	return contexthandler.ProvideService(setting.NewCfg(), tracing.InitializeTracerForTest(), &authntest.FakeService{
 		ExpectedErr:      authErr,
 		ExpectedIdentity: identity,
 	})

pkg/middleware/middleware_test.go

@@ -19,7 +19,6 @@ import (
 	"github.com/grafana/grafana/pkg/services/authn/authntest"
 	"github.com/grafana/grafana/pkg/services/contexthandler"
 	contextmodel "github.com/grafana/grafana/pkg/services/contexthandler/model"
-	"github.com/grafana/grafana/pkg/services/featuremgmt"
 	"github.com/grafana/grafana/pkg/services/navtree"
 	"github.com/grafana/grafana/pkg/services/user/usertest"
 	"github.com/grafana/grafana/pkg/setting"
@@ -273,5 +272,5 @@ func getContextHandler(t *testing.T, cfg *setting.Cfg, authnService authn.Servic
 	t.Helper()
 
 	tracer := tracing.InitializeTracerForTest()
-	return contexthandler.ProvideService(cfg, tracer, featuremgmt.WithFeatures(), authnService)
+	return contexthandler.ProvideService(cfg, tracer, authnService)
 }

pkg/server/wire.go

@@ -360,6 +360,7 @@ var wireBasicSet = wire.NewSet(
 	authnimpl.ProvideService,
 	authnimpl.ProvideIdentitySynchronizer,
 	authnimpl.ProvideAuthnService,
+	authnimpl.ProvideAuthnServiceAuthenticateOnly,
 	authnimpl.ProvideRegistration,
 	supportbundlesimpl.ProvideService,
 	extsvcaccounts.ProvideExtSvcAccountsService,

pkg/services/apiserver/builder/helper.go

@@ -10,6 +10,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/grafana/grafana/pkg/web"
 	"github.com/prometheus/client_golang/prometheus"
 	"golang.org/x/mod/semver"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -53,6 +54,7 @@ func SetupConfig(
 	buildVersion string,
 	buildCommit string,
 	buildBranch string,
+	optionalMiddlewares ...web.Middleware,
 ) error {
 	defsGetter := GetOpenAPIDefinitions(builders)
 	serverConfig.OpenAPIConfig = genericapiserver.DefaultOpenAPIConfig(
@@ -98,6 +100,14 @@ func SetupConfig(
 		handler := filters.WithTracingHTTPLoggingAttributes(requestHandler)
 		handler = filters.WithRequester(handler)
 		handler = genericapiserver.DefaultBuildHandlerChain(handler, c)
+
+		// If optional middlewares include auth function, they need to happen before DefaultBuildHandlerChain
+		if len(optionalMiddlewares) > 0 {
+			for _, m := range optionalMiddlewares {
+				handler = m(handler)
+			}
+		}
+
 		handler = filters.WithAcceptHeader(handler)
 		handler = filters.WithPathRewriters(handler, pathRewriters)
 		handler = k8stracing.WithTracing(handler, serverConfig.TracerProvider, "KubernetesAPI")

pkg/services/apiserver/standalone/factory.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
+	"github.com/grafana/grafana/pkg/web"
 	"github.com/prometheus/client_golang/prometheus"
 	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime/schema"
@@ -33,6 +34,9 @@ type APIServerFactory interface {
 	// Given the flags, what can we produce
 	GetEnabled(runtime []RuntimeConfig) ([]schema.GroupVersion, error)
 
+	// Any optional middlewares this factory wants configured via apiserver's BuildHandlerChain facility
+	GetOptionalMiddlewares(tracer tracing.Tracer) []web.Middleware
+
 	// Make an API server for a given group+version
 	MakeAPIServer(ctx context.Context, tracer tracing.Tracer, gv schema.GroupVersion) (builder.APIGroupBuilder, error)
 
@@ -50,6 +54,10 @@ func (p *DummyAPIFactory) GetOptions() options.OptionsProvider {
 	return nil
 }
 
+func (p *DummyAPIFactory) GetOptionalMiddlewares(_ tracing.Tracer) []web.Middleware {
+	return []web.Middleware{}
+}
+
 func (p *DummyAPIFactory) GetEnabled(runtime []RuntimeConfig) ([]schema.GroupVersion, error) {
 	gv := []schema.GroupVersion{}
 	for _, cfg := range runtime {

pkg/services/authn/authn.go

@@ -73,9 +73,13 @@ type PostAuthHookFn func(ctx context.Context, identity *Identity, r *Request) er
 type PostLoginHookFn func(ctx context.Context, identity *Identity, r *Request, err error)
 type PreLogoutHookFn func(ctx context.Context, requester identity.Requester, sessionToken *usertoken.UserToken) error
 
-type Service interface {
+type Authenticator interface {
 	// Authenticate authenticates a request
 	Authenticate(ctx context.Context, r *Request) (*Identity, error)
+}
+
+type Service interface {
+	Authenticator
 	// RegisterPostAuthHook registers a hook with a priority that is called after a successful authentication.
 	// A lower number means higher priority.
 	RegisterPostAuthHook(hook PostAuthHookFn, priority uint)
@@ -115,10 +119,9 @@ type IdentitySynchronizer interface {
 }
 
 type Client interface {
+	Authenticator
 	// Name returns the name of a client
 	Name() string
-	// Authenticate performs the authentication for the request
-	Authenticate(ctx context.Context, r *Request) (*Identity, error)
 	// IsEnabled returns the enabled status of the client
 	IsEnabled() bool
 }

pkg/services/authn/authnimpl/service.go

@@ -39,6 +39,11 @@ func ProvideAuthnService(s *Service) authn.Service {
 	return s
 }
 
+// make sure service also implements authn.ServiceAuthenticateOnly interface
+func ProvideAuthnServiceAuthenticateOnly(s *Service) authn.Authenticator {
+	return s
+}
+
 // make sure service implements authn.IdentitySynchronizer interface
 func ProvideIdentitySynchronizer(s *Service) authn.IdentitySynchronizer {
 	return s

pkg/services/authn/clients/ext_jwt.go

@@ -20,9 +20,8 @@ import (
 var _ authn.Client = new(ExtendedJWT)
 
 const (
-	extJWTAuthenticationHeaderName  = "X-Access-Token"
-	extJWTAuthorizationHeaderName   = "X-Grafana-Id"
-	extJWTAccessTokenExpectAudience = "grafana"
+	ExtJWTAuthenticationHeaderName = "X-Access-Token"
+	ExtJWTAuthorizationHeaderName  = "X-Grafana-Id"
 )
 
 var (
@@ -46,7 +45,7 @@ func ProvideExtendedJWT(cfg *setting.Cfg) *ExtendedJWT {
 	})
 
 	accessTokenVerifier := authlib.NewAccessTokenVerifier(authlib.VerifierConfig{
-		AllowedAudiences: []string{extJWTAccessTokenExpectAudience},
+		AllowedAudiences: cfg.ExtJWTAuth.Audiences,
 	}, keys)
 
 	// For ID tokens, we explicitly do not validate audience, hence an empty AllowedAudiences
@@ -129,11 +128,19 @@ func (s *ExtendedJWT) authenticateAsUser(
 		return nil, errExtJWTInvalidSubject.Errorf("unexpected identity: %s", userID.String())
 	}
 
+	// For use in service layer, allow higher privilege
+	allowedKubernetesNamespace := accessTokenClaims.Rest.Namespace
+	if len(s.cfg.StackID) > 0 {
+		// For single-tenant cloud use, choose the lower of the two (id token will always have the specific namespace)
+		allowedKubernetesNamespace = idTokenClaims.Rest.Namespace
+	}
+
 	return &authn.Identity{
 		ID:                         userID,
 		OrgID:                      s.getDefaultOrgID(),
 		AuthenticatedBy:            login.ExtendedJWTModule,
 		AuthID:                     accessID.String(),
+		AllowedKubernetesNamespace: allowedKubernetesNamespace,
 		ClientParams: authn.ClientParams{
 			SyncPermissions: true,
 			FetchPermissionsParams: authn.FetchPermissionsParams{
@@ -164,6 +171,7 @@ func (s *ExtendedJWT) authenticateAsService(claims *authlib.Claims[authlib.Acces
 		OrgID:                      s.getDefaultOrgID(),
 		AuthenticatedBy:            login.ExtendedJWTModule,
 		AuthID:                     claims.Subject,
+		AllowedKubernetesNamespace: claims.Rest.Namespace,
 		ClientParams: authn.ClientParams{
 			SyncPermissions: true,
 			FetchPermissionsParams: authn.FetchPermissionsParams{
@@ -208,7 +216,7 @@ func (s *ExtendedJWT) Priority() uint {
 
 // retrieveAuthenticationToken retrieves the JWT token from the request.
 func (s *ExtendedJWT) retrieveAuthenticationToken(httpRequest *http.Request) string {
-	jwtToken := httpRequest.Header.Get(extJWTAuthenticationHeaderName)
+	jwtToken := httpRequest.Header.Get(ExtJWTAuthenticationHeaderName)
 
 	// Strip the 'Bearer' prefix if it exists.
 	return strings.TrimPrefix(jwtToken, "Bearer ")
@@ -216,7 +224,7 @@ func (s *ExtendedJWT) retrieveAuthenticationToken(httpRequest *http.Request) str
 
 // retrieveAuthorizationToken retrieves the JWT token from the request.
 func (s *ExtendedJWT) retrieveAuthorizationToken(httpRequest *http.Request) string {
-	jwtToken := httpRequest.Header.Get(extJWTAuthorizationHeaderName)
+	jwtToken := httpRequest.Header.Get(ExtJWTAuthorizationHeaderName)
 
 	// Strip the 'Bearer' prefix if it exists.
 	return strings.TrimPrefix(jwtToken, "Bearer ")

pkg/services/authn/clients/ext_jwt_test.go

@@ -51,6 +51,17 @@ var (
 			Namespace:       "default", // org ID of 1 is special and translates to default
 		},
 	}
+	validIDTokenClaimsWithStackSet = idTokenClaims{
+		Claims: &jwt.Claims{
+			Subject:  "user:2",
+			Expiry:   jwt.NewNumericDate(time.Date(2023, 5, 3, 0, 0, 0, 0, time.UTC)),
+			IssuedAt: jwt.NewNumericDate(time.Date(2023, 5, 2, 0, 0, 0, 0, time.UTC)),
+		},
+		Rest: authnlib.IDTokenClaims{
+			AuthenticatedBy: "extended_jwt",
+			Namespace:       "stack-1234",
+		},
+	}
 	validAcessTokenClaimsWildcard = accessTokenClaims{
 		Claims: &jwt.Claims{
 			Subject:  "access-policy:this-uid",
@@ -183,6 +194,7 @@ func TestExtendedJWT_Test(t *testing.T) {
 func TestExtendedJWT_Authenticate(t *testing.T) {
 	type testCase struct {
 		name        string
+		cfg         *setting.Cfg // optional, only used when overriding the cfg provided by default test setup
 		accessToken *accessTokenClaims
 		idToken     *idTokenClaims
 		orgID       int64
@@ -198,6 +210,7 @@ func TestExtendedJWT_Authenticate(t *testing.T) {
 				ID:                         authn.MustParseNamespaceID("access-policy:this-uid"),
 				UID:                        authn.MustParseNamespaceID("access-policy:this-uid"),
 				OrgID:                      1,
+				AllowedKubernetesNamespace: "default",
 				AuthenticatedBy:            "extendedjwt",
 				AuthID:                     "access-policy:this-uid",
 				ClientParams: authn.ClientParams{
@@ -213,6 +226,7 @@ func TestExtendedJWT_Authenticate(t *testing.T) {
 				ID:                         authn.MustParseNamespaceID("access-policy:this-uid"),
 				UID:                        authn.MustParseNamespaceID("access-policy:this-uid"),
 				OrgID:                      1,
+				AllowedKubernetesNamespace: "*",
 				AuthenticatedBy:            "extendedjwt",
 				AuthID:                     "access-policy:this-uid",
 				ClientParams: authn.ClientParams{
@@ -228,6 +242,7 @@ func TestExtendedJWT_Authenticate(t *testing.T) {
 			want: &authn.Identity{
 				ID:                         authn.MustParseNamespaceID("user:2"),
 				OrgID:                      1,
+				AllowedKubernetesNamespace: "default",
 				AuthenticatedBy:            "extendedjwt",
 				AuthID:                     "access-policy:this-uid",
 				ClientParams: authn.ClientParams{
@@ -247,6 +262,32 @@ func TestExtendedJWT_Authenticate(t *testing.T) {
 			want: &authn.Identity{
 				ID:                         authn.MustParseNamespaceID("user:2"),
 				OrgID:                      1,
+				AllowedKubernetesNamespace: "*",
+				AuthenticatedBy:            "extendedjwt",
+				AuthID:                     "access-policy:this-uid",
+				ClientParams: authn.ClientParams{
+					FetchSyncedUser: true,
+					SyncPermissions: true,
+				},
+			},
+		},
+		{
+			name:        "should authenticate as user using wildcard namespace for access token, setting allowed namespace to specific",
+			accessToken: &validAcessTokenClaimsWildcard,
+			idToken:     &validIDTokenClaimsWithStackSet,
+			orgID:       1,
+			cfg: &setting.Cfg{
+				// default org set up by the authenticator is 1
+				StackID: "1234",
+				ExtJWTAuth: setting.ExtJWTSettings{
+					Enabled:      true,
+					ExpectIssuer: "http://localhost:3000",
+				},
+			},
+			want: &authn.Identity{
+				ID:                         authn.MustParseNamespaceID("user:2"),
+				OrgID:                      1,
+				AllowedKubernetesNamespace: "stack-1234",
 				AuthenticatedBy:            "extendedjwt",
 				AuthID:                     "access-policy:this-uid",
 				ClientParams: authn.ClientParams{
@@ -301,7 +342,7 @@ func TestExtendedJWT_Authenticate(t *testing.T) {
 
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
-			env := setupTestCtx(nil)
+			env := setupTestCtx(tc.cfg)
 
 			validHTTPReq := &http.Request{
 				Header: map[string][]string{
@@ -313,7 +354,7 @@ func TestExtendedJWT_Authenticate(t *testing.T) {
 			if tc.idToken != nil {
 				env.s.accessTokenVerifier = &mockVerifier{Claims: *tc.accessToken}
 				env.s.idTokenVerifier = &mockIDVerifier{Claims: *tc.idToken}
-				validHTTPReq.Header.Add(extJWTAuthorizationHeaderName, generateIDToken(*tc.idToken, pk, jose.RS256))
+				validHTTPReq.Header.Add(ExtJWTAuthorizationHeaderName, generateIDToken(*tc.idToken, pk, jose.RS256))
 			}
 
 			id, err := env.s.Authenticate(context.Background(), &authn.Request{

pkg/services/authn/identity.go

@@ -47,6 +47,8 @@ type Identity struct {
 	// AuthId is the unique identifier for the entity in the external system.
 	// Empty if the identity is provided by Grafana.
 	AuthID string
+	// AllowedKubernetesNamespace
+	AllowedKubernetesNamespace string
 	// IsDisabled is true if the entity is disabled.
 	IsDisabled bool
 	// HelpFlags1 is the help flags for the entity.
@@ -127,6 +129,10 @@ func (i *Identity) GetLogin() string {
 	return i.Login
 }
 
+func (i *Identity) GetAllowedKubernetesNamespace() string {
+	return i.AllowedKubernetesNamespace
+}
+
 func (i *Identity) GetOrgID() int64 {
 	return i.OrgID
 }

pkg/services/contexthandler/contexthandler.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"net/http"
 
+	authnClients "github.com/grafana/grafana/pkg/services/authn/clients"
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/trace"
 
@@ -16,20 +17,18 @@ import (
 	"github.com/grafana/grafana/pkg/services/authn"
 	"github.com/grafana/grafana/pkg/services/contexthandler/ctxkey"
 	contextmodel "github.com/grafana/grafana/pkg/services/contexthandler/model"
-	"github.com/grafana/grafana/pkg/services/featuremgmt"
 	"github.com/grafana/grafana/pkg/services/login"
 	"github.com/grafana/grafana/pkg/services/user"
 	"github.com/grafana/grafana/pkg/setting"
 	"github.com/grafana/grafana/pkg/web"
 )
 
-func ProvideService(cfg *setting.Cfg, tracer tracing.Tracer, features featuremgmt.FeatureToggles, authnService authn.Service,
+func ProvideService(cfg *setting.Cfg, tracer tracing.Tracer, authenticator authn.Authenticator,
 ) *ContextHandler {
 	return &ContextHandler{
 		Cfg:           cfg,
 		tracer:        tracer,
-		features:     features,
-		authnService: authnService,
+		authenticator: authenticator,
 	}
 }
 
@@ -37,8 +36,7 @@ func ProvideService(cfg *setting.Cfg, tracer tracing.Tracer, features featuremgm
 type ContextHandler struct {
 	Cfg           *setting.Cfg
 	tracer        tracing.Tracer
-	features     featuremgmt.FeatureToggles
-	authnService authn.Service
+	authenticator authn.Authenticator
 }
 
 type reqContextKey = ctxkey.Key
@@ -112,7 +110,7 @@ func (h *ContextHandler) Middleware(next http.Handler) http.Handler {
 			reqContext.Logger = reqContext.Logger.New("traceID", traceID)
 		}
 
-		id, err := h.authnService.Authenticate(ctx, &authn.Request{HTTPRequest: reqContext.Req})
+		id, err := h.authenticator.Authenticate(ctx, &authn.Request{HTTPRequest: reqContext.Req})
 		if err != nil {
 			// Hack: set all errors on LookupTokenErr, so we can check it in auth middlewares
 			reqContext.LookupTokenErr = err
@@ -124,6 +122,8 @@ func (h *ContextHandler) Middleware(next http.Handler) http.Handler {
 			reqContext.IsRenderCall = id.IsAuthenticatedBy(login.RenderModule)
 		}
 
+		h.excludeSensitiveHeadersFromRequest(reqContext.Req)
+
 		reqContext.Logger = reqContext.Logger.New("userId", reqContext.UserID, "orgId", reqContext.OrgID, "uname", reqContext.Login)
 		span.AddEvent("user", trace.WithAttributes(
 			attribute.String("uname", reqContext.Login),
@@ -142,6 +142,11 @@ func (h *ContextHandler) Middleware(next http.Handler) http.Handler {
 	})
 }
 
+func (h *ContextHandler) excludeSensitiveHeadersFromRequest(req *http.Request) {
+	req.Header.Del(authnClients.ExtJWTAuthenticationHeaderName)
+	req.Header.Del(authnClients.ExtJWTAuthorizationHeaderName)
+}
+
 func (h *ContextHandler) addIDHeaderEndOfRequestFunc(ident identity.Requester) web.BeforeFunc {
 	return func(w web.ResponseWriter) {
 		if w.Written() {

pkg/services/contexthandler/contexthandler_test.go

@@ -15,7 +15,6 @@ import (
 	"github.com/grafana/grafana/pkg/services/authn/authntest"
 	"github.com/grafana/grafana/pkg/services/contexthandler"
 	contextmodel "github.com/grafana/grafana/pkg/services/contexthandler/model"
-	"github.com/grafana/grafana/pkg/services/featuremgmt"
 	"github.com/grafana/grafana/pkg/services/login"
 	"github.com/grafana/grafana/pkg/services/user"
 	"github.com/grafana/grafana/pkg/setting"
@@ -27,7 +26,6 @@ func TestContextHandler(t *testing.T) {
 		handler := contexthandler.ProvideService(
 			setting.NewCfg(),
 			tracing.InitializeTracerForTest(),
-			featuremgmt.WithFeatures(),
 			&authntest.FakeService{ExpectedErr: errors.New("some error")},
 		)
 
@@ -49,7 +47,6 @@ func TestContextHandler(t *testing.T) {
 		handler := contexthandler.ProvideService(
 			setting.NewCfg(),
 			tracing.InitializeTracerForTest(),
-			featuremgmt.WithFeatures(),
 			&authntest.FakeService{ExpectedIdentity: id},
 		)
 
@@ -75,7 +72,6 @@ func TestContextHandler(t *testing.T) {
 		handler := contexthandler.ProvideService(
 			setting.NewCfg(),
 			tracing.InitializeTracerForTest(),
-			featuremgmt.WithFeatures(),
 			&authntest.FakeService{ExpectedIdentity: identity},
 		)
 
@@ -97,7 +93,6 @@ func TestContextHandler(t *testing.T) {
 		handler := contexthandler.ProvideService(
 			setting.NewCfg(),
 			tracing.InitializeTracerForTest(),
-			featuremgmt.WithFeatures(),
 			&authntest.FakeService{ExpectedIdentity: identity},
 		)
 
@@ -128,7 +123,6 @@ func TestContextHandler(t *testing.T) {
 		handler := contexthandler.ProvideService(
 			cfg,
 			tracing.InitializeTracerForTest(),
-			featuremgmt.WithFeatures(),
 			&authntest.FakeService{ExpectedIdentity: &authn.Identity{}},
 		)
 
@@ -154,7 +148,6 @@ func TestContextHandler(t *testing.T) {
 			handler := contexthandler.ProvideService(
 				cfg,
 				tracing.InitializeTracerForTest(),
-				featuremgmt.WithFeatures(),
 				&authntest.FakeService{ExpectedIdentity: &authn.Identity{ID: authn.MustParseNamespaceID(id)}},
 			)
 

pkg/services/user/identity.go

@@ -28,6 +28,8 @@ type SignedInUser struct {
 	AuthID string
 	// AuthenticatedBy be set if user signed in using external method
 	AuthenticatedBy            string
+	AllowedKubernetesNamespace string
+
 	ApiKeyID         int64 `xorm:"api_key_id"`
 	IsServiceAccount bool  `xorm:"is_service_account"`
 	IsGrafanaAdmin   bool
@@ -89,6 +91,10 @@ func (u *SignedInUser) HasUniqueId() bool {
 	return u.IsRealUser() || u.IsApiKeyUser() || u.IsServiceAccountUser()
 }
 
+func (u *SignedInUser) GetAllowedKubernetesNamespace() string {
+	return u.AllowedKubernetesNamespace
+}
+
 // GetCacheKey returns a unique key for the entity.
 // Add an extra prefix to avoid collisions with other caches
 func (u *SignedInUser) GetCacheKey() string {

pkg/setting/setting_jwt.go

@@ -2,6 +2,10 @@ package setting
 
 import "time"
 
+const (
+	extJWTAccessTokenExpectAudience = "grafana"
+)
+
 type AuthJWTSettings struct {
 	// JWT Auth
 	Enabled                 bool
@@ -29,6 +33,7 @@ type ExtJWTSettings struct {
 	Enabled      bool
 	ExpectIssuer string
 	JWKSUrl      string
+	Audiences    []string
 }
 
 func (cfg *Cfg) readAuthExtJWTSettings() {
@@ -36,6 +41,9 @@ func (cfg *Cfg) readAuthExtJWTSettings() {
 	jwtSettings := ExtJWTSettings{}
 	jwtSettings.Enabled = authExtendedJWT.Key("enabled").MustBool(false)
 	jwtSettings.JWKSUrl = authExtendedJWT.Key("jwks_url").MustString("")
+	// for Grafana, this is hard coded, but we leave it as a configurable param for other use-cases
+	jwtSettings.Audiences = []string{extJWTAccessTokenExpectAudience}
+
 	cfg.ExtJWTAuth = jwtSettings
 }
 

pkg/web/macaron.go

@@ -139,6 +139,17 @@ func mwFromHandler(handler Handler) Middleware {
 	}
 }
 
+// a convenience function that is provided for users of contexthandler package (standalone apiservers)
+// who have an implicit dependency on Macron in context but don't want to take a dependency on
+// router additionally
+func EmptyMacronMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
+		m := New()
+		c := m.createContext(writer, request)
+		next.ServeHTTP(writer, c.Req) // since c.Req has the newer context attached
+	})
+}
+
 func (m *Macaron) createContext(rw http.ResponseWriter, req *http.Request) *Context {
 	// NOTE: we have to explicitly copy the middleware chain here to avoid
 	// passing a shared slice to the *Context, which leads to racy behavior in