Authn: Identity resolvers (#85930)

* AuthN: Add NamespaceID struct. We should replace the usage of encoded namespaceID with this one

* AuthN: Add optional interface that clients can implement to be able to resolve identity for a namespace

* Authn: Implement IdentityResolverClient for api keys

* AuthN: use idenity resolvers

Co-authored-by: Misi <mgyongyosi@users.noreply.github.com>

pkg/services/accesscontrol/accesscontrol.go

@@ -175,7 +175,9 @@ func HasGlobalAccess(ac AccessControl, authnService authn.Service, c *contextmod
 		var targetOrgID int64 = GlobalOrgID
 		orgUser, err := authnService.ResolveIdentity(c.Req.Context(), targetOrgID, c.SignedInUser.GetID())
 		if err != nil {
-			deny(c, nil, fmt.Errorf("failed to authenticate user in target org: %w", err))
+			// This will be an common error for entities that can't authenticate in global scope
+			c.Logger.Debug("Failed to authenticate user in global scope", "error", err)
+			return false
 		}
 
 		hasAccess, err := ac.Evaluate(c.Req.Context(), orgUser, evaluator)

pkg/services/authn/authn.go

@@ -108,7 +108,7 @@ type Client interface {
 }
 
 // ContextAwareClient is an optional interface that auth client can implement.
-// Clients that implements this interface will be tried during request authentication
+// Clients that implements this interface will be tried during request authentication.
 type ContextAwareClient interface {
 	Client
 	// Test should return true if client can be used to authenticate request
@@ -127,7 +127,7 @@ type HookClient interface {
 
 // RedirectClient is an optional interface that auth clients can implement.
 // Clients that implements this interface can be used to generate redirect urls
-// for authentication flows, e.g. oauth clients
+// for authentication flows, e.g. oauth clients.
 type RedirectClient interface {
 	Client
 	RedirectURL(ctx context.Context, r *Request) (*Redirect, error)
@@ -150,12 +150,20 @@ type ProxyClient interface {
 }
 
 // UsageStatClient is an optional interface that auth clients can implement.
-// Clients that implements this interface can specify a usage stat collection hook
+// Clients that implements this interface can specify a usage stat collection hook.
 type UsageStatClient interface {
 	Client
 	UsageStatFn(ctx context.Context) (map[string]any, error)
 }
 
+// IdentityResolverClient is an optional interface that auth clients can implement.
+// Clients that implements this interface can resolve an full identity from an orgID and namespaceID.
+type IdentityResolverClient interface {
+	Client
+	Namespace() string
+	ResolveIdentity(ctx context.Context, orgID int64, namespaceID NamespaceID) (*Identity, error)
+}
+
 type Request struct {
 	// OrgID will be populated by authn.Service
 	OrgID int64

pkg/services/authn/authnimpl/service.go

@@ -49,15 +49,16 @@ func ProvideService(
 	sessionService auth.UserTokenService, usageStats usagestats.Service, registerer prometheus.Registerer,
 ) *Service {
 	s := &Service{
-		log:            log.New("authn.service"),
-		cfg:            cfg,
-		clients:        make(map[string]authn.Client),
-		clientQueue:    newQueue[authn.ContextAwareClient](),
-		tracer:         tracer,
-		metrics:        newMetrics(registerer),
-		sessionService: sessionService,
-		postAuthHooks:  newQueue[authn.PostAuthHookFn](),
-		postLoginHooks: newQueue[authn.PostLoginHookFn](),
+		log:                    log.New("authn.service"),
+		cfg:                    cfg,
+		clients:                make(map[string]authn.Client),
+		clientQueue:            newQueue[authn.ContextAwareClient](),
+		idenityResolverClients: make(map[string]authn.IdentityResolverClient),
+		tracer:                 tracer,
+		metrics:                newMetrics(registerer),
+		sessionService:         sessionService,
+		postAuthHooks:          newQueue[authn.PostAuthHookFn](),
+		postLoginHooks:         newQueue[authn.PostLoginHookFn](),
 	}
 
 	usageStats.RegisterMetricsFunc(s.getUsageStats)
@@ -71,6 +72,8 @@ type Service struct {
 	clients     map[string]authn.Client
 	clientQueue *queue[authn.ContextAwareClient]
 
+	idenityResolverClients map[string]authn.IdentityResolverClient
+
 	tracer  tracing.Tracer
 	metrics *metrics
 
@@ -292,19 +295,29 @@ func (s *Service) ResolveIdentity(ctx context.Context, orgID int64, namespaceID
 	// hack to not update last seen
 	r.SetMeta(authn.MetaKeyIsLogin, "true")
 
-	identity, err := s.authenticate(ctx, clients.ProvideIdentity(namespaceID), r)
+	id, err := authn.ParseNamespaceID(namespaceID)
 	if err != nil {
 		return nil, err
 	}
 
-	return identity, nil
+	identity, err := s.resolveIdenity(ctx, orgID, id)
+	if err != nil {
+		return nil, err
+	}
+
+	return s.authenticate(ctx, clients.ProvideIdentity(identity), r)
 }
 
 func (s *Service) RegisterClient(c authn.Client) {
 	s.clients[c.Name()] = c
+
 	if cac, ok := c.(authn.ContextAwareClient); ok {
 		s.clientQueue.insert(cac, cac.Priority())
 	}
+
+	if rc, ok := c.(authn.IdentityResolverClient); ok {
+		s.idenityResolverClients[rc.Namespace()] = rc
+	}
 }
 
 func (s *Service) SyncIdentity(ctx context.Context, identity *authn.Identity) error {
@@ -314,6 +327,35 @@ func (s *Service) SyncIdentity(ctx context.Context, identity *authn.Identity) er
 	return s.runPostAuthHooks(ctx, identity, r)
 }
 
+func (s *Service) resolveIdenity(ctx context.Context, orgID int64, namespaceID authn.NamespaceID) (*authn.Identity, error) {
+	if namespaceID.IsNamespace(authn.NamespaceUser) {
+		return &authn.Identity{
+			OrgID: orgID,
+			ID:    namespaceID.String(),
+			ClientParams: authn.ClientParams{
+				AllowGlobalOrg:  true,
+				FetchSyncedUser: true,
+				SyncPermissions: true,
+			}}, nil
+	}
+
+	if namespaceID.IsNamespace(authn.NamespaceServiceAccount) {
+		return &authn.Identity{
+			ID:    namespaceID.String(),
+			OrgID: orgID,
+			ClientParams: authn.ClientParams{
+				FetchSyncedUser: true,
+				SyncPermissions: true,
+			}}, nil
+	}
+
+	resolver, ok := s.idenityResolverClients[namespaceID.Namespace()]
+	if !ok {
+		return nil, authn.ErrUnsupportedIdentity.Errorf("no resolver for : %s", namespaceID.Namespace())
+	}
+	return resolver.ResolveIdentity(ctx, orgID, namespaceID)
+}
+
 func (s *Service) errorLogFunc(ctx context.Context, err error) func(msg string, ctx ...any) {
 	if errors.Is(err, context.Canceled) {
 		return func(msg string, ctx ...any) {}

pkg/services/authn/authnimpl/service_test.go

@@ -383,6 +383,49 @@ func TestService_Logout(t *testing.T) {
 	}
 }
 
+func TestService_ResolveIdentity(t *testing.T) {
+	t.Run("should return error for for unknown namespace", func(t *testing.T) {
+		svc := setupTests(t)
+		_, err := svc.ResolveIdentity(context.Background(), 1, "some:1")
+		assert.ErrorIs(t, err, authn.ErrInvalidNamepsaceID)
+	})
+
+	t.Run("should return error for for namespace that don't have a resolver", func(t *testing.T) {
+		svc := setupTests(t)
+		_, err := svc.ResolveIdentity(context.Background(), 1, "api-key:1")
+		assert.ErrorIs(t, err, authn.ErrUnsupportedIdentity)
+	})
+
+	t.Run("should resolve for user", func(t *testing.T) {
+		svc := setupTests(t)
+		identity, err := svc.ResolveIdentity(context.Background(), 1, "user:1")
+		assert.NoError(t, err)
+		assert.NotNil(t, identity)
+	})
+
+	t.Run("should resolve for service account", func(t *testing.T) {
+		svc := setupTests(t)
+		identity, err := svc.ResolveIdentity(context.Background(), 1, "service-account:1")
+		assert.NoError(t, err)
+		assert.NotNil(t, identity)
+	})
+
+	t.Run("should resolve for valid namespace if client is registered", func(t *testing.T) {
+		svc := setupTests(t, func(svc *Service) {
+			svc.RegisterClient(&authntest.MockClient{
+				NamespaceFunc: func() string { return authn.NamespaceAPIKey },
+				ResolveIdentityFunc: func(ctx context.Context, orgID int64, namespaceID authn.NamespaceID) (*authn.Identity, error) {
+					return &authn.Identity{}, nil
+				},
+			})
+		})
+
+		identity, err := svc.ResolveIdentity(context.Background(), 1, "api-key:1")
+		assert.NoError(t, err)
+		assert.NotNil(t, identity)
+	})
+}
+
 func mustParseURL(s string) *url.URL {
 	u, err := url.Parse(s)
 	if err != nil {
@@ -395,14 +438,15 @@ func setupTests(t *testing.T, opts ...func(svc *Service)) *Service {
 	t.Helper()
 
 	s := &Service{
-		log:            log.NewNopLogger(),
-		cfg:            setting.NewCfg(),
-		clients:        map[string]authn.Client{},
-		clientQueue:    newQueue[authn.ContextAwareClient](),
-		tracer:         tracing.InitializeTracerForTest(),
-		metrics:        newMetrics(nil),
-		postAuthHooks:  newQueue[authn.PostAuthHookFn](),
-		postLoginHooks: newQueue[authn.PostLoginHookFn](),
+		log:                    log.NewNopLogger(),
+		cfg:                    setting.NewCfg(),
+		clients:                make(map[string]authn.Client),
+		clientQueue:            newQueue[authn.ContextAwareClient](),
+		idenityResolverClients: make(map[string]authn.IdentityResolverClient),
+		tracer:                 tracing.InitializeTracerForTest(),
+		metrics:                newMetrics(nil),
+		postAuthHooks:          newQueue[authn.PostAuthHookFn](),
+		postLoginHooks:         newQueue[authn.PostLoginHookFn](),
 	}
 
 	for _, o := range opts {

pkg/services/authn/authntest/mock.go

@@ -60,14 +60,17 @@ func (m *MockService) SyncIdentity(ctx context.Context, identity *authn.Identity
 var _ authn.HookClient = new(MockClient)
 var _ authn.LogoutClient = new(MockClient)
 var _ authn.ContextAwareClient = new(MockClient)
+var _ authn.IdentityResolverClient = new(MockClient)
 
 type MockClient struct {
-	NameFunc         func() string
-	AuthenticateFunc func(ctx context.Context, r *authn.Request) (*authn.Identity, error)
-	TestFunc         func(ctx context.Context, r *authn.Request) bool
-	PriorityFunc     func() uint
-	HookFunc         func(ctx context.Context, identity *authn.Identity, r *authn.Request) error
-	LogoutFunc       func(ctx context.Context, user identity.Requester) (*authn.Redirect, bool)
+	NameFunc            func() string
+	AuthenticateFunc    func(ctx context.Context, r *authn.Request) (*authn.Identity, error)
+	TestFunc            func(ctx context.Context, r *authn.Request) bool
+	PriorityFunc        func() uint
+	HookFunc            func(ctx context.Context, identity *authn.Identity, r *authn.Request) error
+	LogoutFunc          func(ctx context.Context, user identity.Requester) (*authn.Redirect, bool)
+	NamespaceFunc       func() string
+	ResolveIdentityFunc func(ctx context.Context, orgID int64, namespaceID authn.NamespaceID) (*authn.Identity, error)
 }
 
 func (m MockClient) Name() string {
@@ -112,6 +115,21 @@ func (m *MockClient) Logout(ctx context.Context, user identity.Requester) (*auth
 	return nil, false
 }
 
+func (m *MockClient) Namespace() string {
+	if m.NamespaceFunc != nil {
+		return m.NamespaceFunc()
+	}
+	return ""
+}
+
+// ResolveIdentity implements authn.IdentityResolverClient.
+func (m *MockClient) ResolveIdentity(ctx context.Context, orgID int64, namespaceID authn.NamespaceID) (*authn.Identity, error) {
+	if m.ResolveIdentityFunc != nil {
+		return m.ResolveIdentityFunc(ctx, orgID, namespaceID)
+	}
+	return nil, nil
+}
+
 var _ authn.ProxyClient = new(MockProxyClient)
 
 type MockProxyClient struct {

pkg/services/authn/clients/api_key.go

@@ -27,6 +27,7 @@ var (
 
 var _ authn.HookClient = new(APIKey)
 var _ authn.ContextAwareClient = new(APIKey)
+var _ authn.IdentityResolverClient = new(APIKey)
 
 func ProvideAPIKey(apiKeyService apikey.Service) *APIKey {
 	return &APIKey{
@@ -45,7 +46,7 @@ func (s *APIKey) Name() string {
 }
 
 func (s *APIKey) Authenticate(ctx context.Context, r *authn.Request) (*authn.Identity, error) {
-	apiKey, err := s.getAPIKey(ctx, getTokenFromRequest(r))
+	key, err := s.getAPIKey(ctx, getTokenFromRequest(r))
 	if err != nil {
 		if errors.Is(err, apikeygen.ErrInvalidApiKey) {
 			return nil, errAPIKeyInvalid.Errorf("API key is invalid")
@@ -53,37 +54,20 @@ func (s *APIKey) Authenticate(ctx context.Context, r *authn.Request) (*authn.Ide
 		return nil, err
 	}
 
-	if apiKey.Expires != nil && *apiKey.Expires <= time.Now().Unix() {
-		return nil, errAPIKeyExpired.Errorf("API key has expired")
-	}
-
-	if apiKey.IsRevoked != nil && *apiKey.IsRevoked {
-		return nil, errAPIKeyRevoked.Errorf("Api key is revoked")
+	if r.OrgID == 0 {
+		r.OrgID = key.OrgID
 	}
 
-	if r.OrgID == 0 {
-		r.OrgID = apiKey.OrgID
-	} else if r.OrgID != apiKey.OrgID {
-		return nil, errAPIKeyOrgMismatch.Errorf("API does not belong in Organization %v", r.OrgID)
+	if err := validateApiKey(r.OrgID, key); err != nil {
+		return nil, err
 	}
 
 	// if the api key don't belong to a service account construct the identity and return it
-	if apiKey.ServiceAccountId == nil || *apiKey.ServiceAccountId < 1 {
-		return &authn.Identity{
-			ID:              authn.NamespacedID(authn.NamespaceAPIKey, apiKey.ID),
-			OrgID:           apiKey.OrgID,
-			OrgRoles:        map[int64]org.RoleType{apiKey.OrgID: apiKey.Role},
-			ClientParams:    authn.ClientParams{SyncPermissions: true},
-			AuthenticatedBy: login.APIKeyAuthModule,
-		}, nil
+	if key.ServiceAccountId == nil || *key.ServiceAccountId < 1 {
+		return newAPIKeyIdentity(key), nil
 	}
 
-	return &authn.Identity{
-		ID:              authn.NamespacedID(authn.NamespaceServiceAccount, *apiKey.ServiceAccountId),
-		OrgID:           apiKey.OrgID,
-		AuthenticatedBy: login.APIKeyAuthModule,
-		ClientParams:    authn.ClientParams{FetchSyncedUser: true, SyncPermissions: true},
-	}, nil
+	return newServiceAccountIdentity(key), nil
 }
 
 func (s *APIKey) getAPIKey(ctx context.Context, token string) (*apikey.APIKey, error) {
@@ -147,6 +131,38 @@ func (s *APIKey) Priority() uint {
 	return 30
 }
 
+func (s *APIKey) Namespace() string {
+	return authn.NamespaceAPIKey
+}
+
+func (s *APIKey) ResolveIdentity(ctx context.Context, orgID int64, namespaceID authn.NamespaceID) (*authn.Identity, error) {
+	if !namespaceID.IsNamespace(authn.NamespaceAPIKey) {
+		return nil, authn.ErrInvalidNamepsaceID.Errorf("got unspected namespace: %s", namespaceID.Namespace())
+	}
+
+	apiKeyID, err := namespaceID.ParseInt()
+	if err != nil {
+		return nil, err
+	}
+
+	key, err := s.apiKeyService.GetApiKeyById(ctx, &apikey.GetByIDQuery{
+		ApiKeyID: apiKeyID,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	if err := validateApiKey(orgID, key); err != nil {
+		return nil, err
+	}
+
+	if key.ServiceAccountId != nil && *key.ServiceAccountId >= 1 {
+		return nil, authn.ErrInvalidNamepsaceID.Errorf("api key belongs to service account")
+	}
+
+	return newAPIKeyIdentity(key), nil
+}
+
 func (s *APIKey) Hook(ctx context.Context, identity *authn.Identity, r *authn.Request) error {
 	id, exists := s.getAPIKeyID(ctx, identity, r)
 
@@ -217,3 +233,38 @@ func getTokenFromRequest(r *authn.Request) string {
 	}
 	return ""
 }
+
+func validateApiKey(orgID int64, key *apikey.APIKey) error {
+	if key.Expires != nil && *key.Expires <= time.Now().Unix() {
+		return errAPIKeyExpired.Errorf("API key has expired")
+	}
+
+	if key.IsRevoked != nil && *key.IsRevoked {
+		return errAPIKeyRevoked.Errorf("Api key is revoked")
+	}
+
+	if orgID != key.OrgID {
+		return errAPIKeyOrgMismatch.Errorf("API does not belong in Organization")
+	}
+
+	return nil
+}
+
+func newAPIKeyIdentity(key *apikey.APIKey) *authn.Identity {
+	return &authn.Identity{
+		ID:              authn.NamespacedID(authn.NamespaceAPIKey, key.ID),
+		OrgID:           key.OrgID,
+		OrgRoles:        map[int64]org.RoleType{key.OrgID: key.Role},
+		ClientParams:    authn.ClientParams{SyncPermissions: true},
+		AuthenticatedBy: login.APIKeyAuthModule,
+	}
+}
+
+func newServiceAccountIdentity(key *apikey.APIKey) *authn.Identity {
+	return &authn.Identity{
+		ID:              authn.NamespacedID(authn.NamespaceServiceAccount, *key.ServiceAccountId),
+		OrgID:           key.OrgID,
+		AuthenticatedBy: login.APIKeyAuthModule,
+		ClientParams:    authn.ClientParams{FetchSyncedUser: true, SyncPermissions: true},
+	}
+}

pkg/services/authn/clients/api_key_test.go

@@ -283,6 +283,100 @@ func TestAPIKey_GetAPIKeyIDFromIdentity(t *testing.T) {
 	}
 }
 
+func TestAPIKey_ResolveIdentity(t *testing.T) {
+	type testCase struct {
+		desc        string
+		namespaceID authn.NamespaceID
+
+		exptedApiKey *apikey.APIKey
+
+		expectedIdenity *authn.Identity
+		expectedErr     error
+	}
+
+	tests := []testCase{
+		{
+			desc:        "should return error for invalid namespace",
+			namespaceID: authn.MustParseNamespaceID("user:1"),
+			expectedErr: authn.ErrInvalidNamepsaceID,
+		},
+		{
+			desc:        "should return error when api key has expired",
+			namespaceID: authn.MustParseNamespaceID("api-key:1"),
+			exptedApiKey: &apikey.APIKey{
+				ID:      1,
+				OrgID:   1,
+				Expires: intPtr(0),
+			},
+			expectedErr: errAPIKeyExpired,
+		},
+		{
+			desc:        "should return error when api key is revoked",
+			namespaceID: authn.MustParseNamespaceID("api-key:1"),
+			exptedApiKey: &apikey.APIKey{
+				ID:        1,
+				OrgID:     1,
+				IsRevoked: boolPtr(true),
+			},
+			expectedErr: errAPIKeyRevoked,
+		},
+		{
+			desc:        "should return error when api key is connected to service account",
+			namespaceID: authn.MustParseNamespaceID("api-key:1"),
+			exptedApiKey: &apikey.APIKey{
+				ID:               1,
+				OrgID:            1,
+				ServiceAccountId: intPtr(1),
+			},
+			expectedErr: authn.ErrInvalidNamepsaceID,
+		},
+		{
+			desc:        "should return error when api key is belongs to different org",
+			namespaceID: authn.MustParseNamespaceID("api-key:1"),
+			exptedApiKey: &apikey.APIKey{
+				ID:               1,
+				OrgID:            2,
+				ServiceAccountId: intPtr(1),
+			},
+			expectedErr: errAPIKeyOrgMismatch,
+		},
+		{
+			desc:        "should return valid idenitty",
+			namespaceID: authn.MustParseNamespaceID("api-key:1"),
+			exptedApiKey: &apikey.APIKey{
+				ID:    1,
+				OrgID: 1,
+				Role:  org.RoleEditor,
+			},
+			expectedIdenity: &authn.Identity{
+				OrgID:           1,
+				OrgRoles:        map[int64]org.RoleType{1: org.RoleEditor},
+				ID:              "api-key:1",
+				AuthenticatedBy: login.APIKeyAuthModule,
+				ClientParams:    authn.ClientParams{SyncPermissions: true},
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.desc, func(t *testing.T) {
+			c := ProvideAPIKey(&apikeytest.Service{
+				ExpectedAPIKey: tt.exptedApiKey,
+			})
+
+			identity, err := c.ResolveIdentity(context.Background(), 1, tt.namespaceID)
+			if tt.expectedErr != nil {
+				assert.Nil(t, identity)
+				assert.ErrorIs(t, err, tt.expectedErr)
+				return
+			}
+
+			assert.NoError(t, err)
+			assert.EqualValues(t, *tt.expectedIdenity, *identity)
+		})
+	}
+}
+
 func intPtr(n int64) *int64 {
 	return &n
 }

pkg/services/authn/clients/identity.go

@@ -8,27 +8,18 @@ import (
 
 var _ authn.Client = (*IdentityClient)(nil)
 
-func ProvideIdentity(namespaceID string) *IdentityClient {
-	return &IdentityClient{namespaceID}
+func ProvideIdentity(identity *authn.Identity) *IdentityClient {
+	return &IdentityClient{identity}
 }
 
 type IdentityClient struct {
-	namespaceID string
+	identity *authn.Identity
 }
 
 func (i *IdentityClient) Name() string {
 	return "identity"
 }
 
-// Authenticate implements authn.Client.
 func (i *IdentityClient) Authenticate(ctx context.Context, r *authn.Request) (*authn.Identity, error) {
-	return &authn.Identity{
-		OrgID: r.OrgID,
-		ID:    i.namespaceID,
-		ClientParams: authn.ClientParams{
-			AllowGlobalOrg:  true,
-			FetchSyncedUser: true,
-			SyncPermissions: true,
-		},
-	}, nil
+	return i.identity, nil
 }

pkg/services/authn/error.go

@@ -8,4 +8,5 @@ var (
 	ErrClientNotConfigured = errutil.BadRequest("auth.client.notConfigured")
 	ErrUnsupportedIdentity = errutil.NotImplemented("auth.identity.unsupported")
 	ErrExpiredAccessToken  = errutil.Unauthorized("oauth.expired-token", errutil.WithPublicMessage("OAuth access token expired"))
+	ErrInvalidNamepsaceID  = errutil.BadRequest("auth.identity.invalid-namespace-id")
 )

pkg/services/authn/identity.go

@@ -16,24 +16,7 @@ import (
 	"github.com/grafana/grafana/pkg/services/user"
 )
 
-// NamespacedID builds a namespaced ID from a namespace and an ID.
-func NamespacedID(namespace string, id int64) string {
-	return fmt.Sprintf("%s:%d", namespace, id)
-}
-
-const (
-	NamespaceUser           = identity.NamespaceUser
-	NamespaceAPIKey         = identity.NamespaceAPIKey
-	NamespaceServiceAccount = identity.NamespaceServiceAccount
-	NamespaceAnonymous      = identity.NamespaceAnonymous
-	NamespaceRenderService  = identity.NamespaceRenderService
-	NamespaceAccessPolicy   = identity.NamespaceAccessPolicy
-)
-
-const (
-	AnonymousNamespaceID = NamespaceAnonymous + ":0"
-	GlobalOrgID          = int64(0)
-)
+const GlobalOrgID = int64(0)
 
 var _ identity.Requester = (*Identity)(nil)
 
@@ -145,7 +128,6 @@ func (i *Identity) GetLogin() string {
 	return i.Login
 }
 
-// GetOrgID implements identity.Requester.
 func (i *Identity) GetOrgID() int64 {
 	return i.OrgID
 }

pkg/services/authn/namespace.go

@@ -0,0 +1,89 @@
+package authn
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/grafana/grafana/pkg/services/auth/identity"
+)
+
+const (
+	NamespaceUser           = identity.NamespaceUser
+	NamespaceAPIKey         = identity.NamespaceAPIKey
+	NamespaceServiceAccount = identity.NamespaceServiceAccount
+	NamespaceAnonymous      = identity.NamespaceAnonymous
+	NamespaceRenderService  = identity.NamespaceRenderService
+	NamespaceAccessPolicy   = identity.NamespaceAccessPolicy
+	AnonymousNamespaceID    = NamespaceAnonymous + ":0"
+)
+
+var namespaceLookup = map[string]struct{}{
+	NamespaceUser:           {},
+	NamespaceAPIKey:         {},
+	NamespaceServiceAccount: {},
+	NamespaceAnonymous:      {},
+	NamespaceRenderService:  {},
+	NamespaceAccessPolicy:   {},
+}
+
+// NamespacedID builds a namespaced ID from a namespace and an ID.
+func NamespacedID(namespace string, id int64) string {
+	return fmt.Sprintf("%s:%d", namespace, id)
+}
+
+func ParseNamespaceID(str string) (NamespaceID, error) {
+	var namespaceID NamespaceID
+
+	parts := strings.Split(str, ":")
+	if len(parts) != 2 {
+		return namespaceID, ErrInvalidNamepsaceID.Errorf("expected namespace id to have 2 parts")
+	}
+
+	namespace, id := parts[0], parts[1]
+
+	if _, ok := namespaceLookup[namespace]; !ok {
+		return namespaceID, ErrInvalidNamepsaceID.Errorf("got invalid namespace %s", namespace)
+	}
+
+	namespaceID.id = id
+	namespaceID.namespace = namespace
+
+	return namespaceID, nil
+}
+
+// MustParseNamespaceID parses namespace id, it will panic it failes to do so.
+// Sutable to use in tests or when we can garantuee that we pass a correct format.
+func MustParseNamespaceID(str string) NamespaceID {
+	namespaceID, err := ParseNamespaceID(str)
+	if err != nil {
+		panic(err)
+	}
+	return namespaceID
+}
+
+// FIXME: use this instead of encoded string through the codebase
+type NamespaceID struct {
+	id        string
+	namespace string
+}
+
+func (ni NamespaceID) ID() string {
+	return ni.id
+}
+
+func (ni NamespaceID) ParseInt() (int64, error) {
+	return strconv.ParseInt(ni.id, 10, 64)
+}
+
+func (ni NamespaceID) Namespace() string {
+	return ni.namespace
+}
+
+func (ni NamespaceID) IsNamespace(expected ...string) bool {
+	return identity.IsNamespace(ni.namespace, expected...)
+}
+
+func (ni NamespaceID) String() string {
+	return fmt.Sprintf("%s:%s", ni.namespace, ni.id)
+}