proposal: add banneduser middleware

pkg/application/service/services.go

@@ -16,6 +16,7 @@ type InformerService interface {
 	ListSpaceBindings(reqs ...labels.Requirement) ([]toolchainv1alpha1.SpaceBinding, error)
 	GetProxyPluginConfig(name string) (*toolchainv1alpha1.ProxyPlugin, error)
 	GetNSTemplateTier(name string) (*toolchainv1alpha1.NSTemplateTier, error)
+	ListBannedUsersByEmail(email string) ([]toolchainv1alpha1.BannedUser, error)
 }
 
 type SignupService interface {

pkg/informers/informers.go

@@ -3,6 +3,7 @@ package informers
 import (
 	"fmt"
 
+	toolchainv1alpha1 "github.com/codeready-toolchain/api/api/v1alpha1"
 	"github.com/codeready-toolchain/registration-service/pkg/configuration"
 	"github.com/codeready-toolchain/registration-service/pkg/kubeclient/resources"
 	"github.com/codeready-toolchain/registration-service/pkg/log"
@@ -23,9 +24,12 @@ type Informer struct {
 	UserSignup        cache.GenericLister
 	ProxyPluginConfig cache.GenericLister
 	NSTemplateTier    cache.GenericLister
+	BannedUsers       cache.GenericLister
 }
 
 func StartInformer(cfg *rest.Config) (*Informer, chan struct{}, error) {
+	group := toolchainv1alpha1.GroupVersion.Group
+	version := toolchainv1alpha1.GroupVersion.Version
 
 	informer := &Informer{}
 	dynamicClient, err := dynamic.NewForConfig(cfg)
@@ -36,40 +40,45 @@ func StartInformer(cfg *rest.Config) (*Informer, chan struct{}, error) {
 	factory := dynamicinformer.NewFilteredDynamicSharedInformerFactory(dynamicClient, 0, configuration.Namespace(), nil)
 
 	// MasterUserRecords
-	genericMasterUserRecordInformer := factory.ForResource(schema.GroupVersionResource{Group: "toolchain.dev.openshift.com", Version: "v1alpha1", Resource: resources.MurResourcePlural})
+	genericMasterUserRecordInformer := factory.ForResource(schema.GroupVersionResource{Group: group, Version: version, Resource: resources.MurResourcePlural})
 	informer.Masteruserrecord = genericMasterUserRecordInformer.Lister()
 	masterUserRecordInformer := genericMasterUserRecordInformer.Informer()
 
 	// Space
-	genericSpaceInformer := factory.ForResource(schema.GroupVersionResource{Group: "toolchain.dev.openshift.com", Version: "v1alpha1", Resource: resources.SpaceResourcePlural})
+	genericSpaceInformer := factory.ForResource(schema.GroupVersionResource{Group: group, Version: version, Resource: resources.SpaceResourcePlural})
 	informer.Space = genericSpaceInformer.Lister()
 	spaceInformer := genericSpaceInformer.Informer()
 
 	// SpaceBinding
-	genericSpaceBindingInformer := factory.ForResource(schema.GroupVersionResource{Group: "toolchain.dev.openshift.com", Version: "v1alpha1", Resource: resources.SpaceBindingResourcePlural})
+	genericSpaceBindingInformer := factory.ForResource(schema.GroupVersionResource{Group: group, Version: version, Resource: resources.SpaceBindingResourcePlural})
 	informer.SpaceBinding = genericSpaceBindingInformer.Lister()
 	spaceBindingInformer := genericSpaceBindingInformer.Informer()
 
 	// ToolchainStatus
-	genericToolchainStatusInformer := factory.ForResource(schema.GroupVersionResource{Group: "toolchain.dev.openshift.com", Version: "v1alpha1", Resource: resources.ToolchainStatusPlural})
+	genericToolchainStatusInformer := factory.ForResource(schema.GroupVersionResource{Group: group, Version: version, Resource: resources.ToolchainStatusPlural})
 	informer.ToolchainStatus = genericToolchainStatusInformer.Lister()
 	toolchainstatusInformer := genericToolchainStatusInformer.Informer()
 
 	// UserSignups
-	genericUserSignupInformer := factory.ForResource(schema.GroupVersionResource{Group: "toolchain.dev.openshift.com", Version: "v1alpha1", Resource: resources.UserSignupResourcePlural})
+	genericUserSignupInformer := factory.ForResource(schema.GroupVersionResource{Group: group, Version: version, Resource: resources.UserSignupResourcePlural})
 	informer.UserSignup = genericUserSignupInformer.Lister()
 	userSignupInformer := genericUserSignupInformer.Informer()
 
 	// Proxy plugins
-	proxyPluginInformer := factory.ForResource(schema.GroupVersionResource{Group: "toolchain.dev.openshift.com", Version: "v1alpha1", Resource: resources.ProxyPluginsPlural})
+	proxyPluginInformer := factory.ForResource(schema.GroupVersionResource{Group: group, Version: version, Resource: resources.ProxyPluginsPlural})
 	informer.ProxyPluginConfig = proxyPluginInformer.Lister()
 	proxyPluginConfigInformer := proxyPluginInformer.Informer()
 
 	// NSTemplateTier plugins
-	genericNSTemplateTierInformer := factory.ForResource(schema.GroupVersionResource{Group: "toolchain.dev.openshift.com", Version: "v1alpha1", Resource: resources.NSTemplateTierPlural})
+	genericNSTemplateTierInformer := factory.ForResource(schema.GroupVersionResource{Group: group, Version: version, Resource: resources.NSTemplateTierPlural})
 	informer.NSTemplateTier = genericNSTemplateTierInformer.Lister()
 	nsTemplateTierInformer := genericNSTemplateTierInformer.Informer()
 
+	// BannedUsers
+	genericBannedUsersInformer := factory.ForResource(schema.GroupVersionResource{Group: group, Version: version, Resource: resources.BannedUserResourcePlural})
+	informer.BannedUsers = genericBannedUsersInformer.Lister()
+	bannedUsersInformer := genericBannedUsersInformer.Informer()
+
 	stopper := make(chan struct{})
 
 	log.Info(nil, "Starting proxy cache informers")
@@ -83,6 +92,7 @@ func StartInformer(cfg *rest.Config) (*Informer, chan struct{}, error) {
 		userSignupInformer.HasSynced,
 		proxyPluginConfigInformer.HasSynced,
 		nsTemplateTierInformer.HasSynced,
+		bannedUsersInformer.HasSynced,
 	) {
 		err := fmt.Errorf("timed out waiting for caches to sync")
 		log.Error(nil, err, "Failed to create informers")

pkg/informers/service/informer_service.go

@@ -9,10 +9,12 @@
 	"github.com/codeready-toolchain/registration-service/pkg/informers"
 	"github.com/codeready-toolchain/registration-service/pkg/kubeclient/resources"
 	"github.com/codeready-toolchain/registration-service/pkg/log"
+	"github.com/codeready-toolchain/toolchain-common/pkg/hash"
 
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/selection"
 )
 
 type Option func(f *ServiceImpl)
@@ -145,3 +147,33 @@
 	}
 	return tier, err
 }
+
+func (s *ServiceImpl) ListBannedUsersByEmail(email string) ([]toolchainv1alpha1.BannedUser, error) {
+	hashedEmail := hash.EncodeString(email)
+	r, err := labels.NewRequirement(toolchainv1alpha1.BannedUserEmailHashLabelKey, selection.Equals, []string{hashedEmail})
+	if err != nil {
+		return nil, err
+	}
+
+	ls := labels.NewSelector().Add(*r)
+	objs, err := s.informer.BannedUsers.ByNamespace(configuration.Namespace()).List(ls)
+	if err != nil {
+		return nil, err
+	}
+
+	bb := []toolchainv1alpha1.BannedUser{}
+	for _, obj := range objs {
+		unobj := obj.(*unstructured.Unstructured)
+		bu := &toolchainv1alpha1.BannedUser{}
+		if err := runtime.DefaultUnstructuredConverter.FromUnstructured(unobj.UnstructuredContent(), bu); err != nil {
+			log.Errorf(nil, err, "failed to list BannedUsers")
+			return nil, err
+		}
+
+		// check in case of hash collision
+		if bu.Spec.Email == email {
+			bb = append(bb, *bu)
+		}
+	}
+	return bb, nil
+}

pkg/informers/service/informer_service_test.go

@@ -6,15 +6,18 @@ import (
 
 	toolchainv1alpha1 "github.com/codeready-toolchain/api/api/v1alpha1"
 	appservice "github.com/codeready-toolchain/registration-service/pkg/application/service"
+	"github.com/codeready-toolchain/registration-service/pkg/configuration"
 	"github.com/codeready-toolchain/registration-service/pkg/informers"
 	"github.com/codeready-toolchain/registration-service/pkg/informers/service"
 	"github.com/codeready-toolchain/registration-service/pkg/kubeclient"
 	"github.com/codeready-toolchain/registration-service/test"
+	"github.com/codeready-toolchain/toolchain-common/pkg/hash"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"github.com/stretchr/testify/suite"
 
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/runtime"
@@ -386,6 +389,108 @@ func (s *TestInformerServiceSuite) TestInformerService() {
 		})
 	})
 
+	s.Run("bannedusers", func() {
+		// given
+		bb := map[string]toolchainv1alpha1.BannedUser{
+			"alice": {
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      "alice",
+					Namespace: configuration.Namespace(),
+					Labels: map[string]string{
+						toolchainv1alpha1.BannedUserEmailHashLabelKey: hash.EncodeString("alice@redhat.com"),
+					},
+				},
+				Spec: toolchainv1alpha1.BannedUserSpec{
+					Email: "alice@redhat.com",
+				},
+			},
+			"bob": {
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      "bob",
+					Namespace: configuration.Namespace(),
+					Labels: map[string]string{
+						toolchainv1alpha1.BannedUserEmailHashLabelKey: hash.EncodeString("bob@redhat.com"),
+					},
+				},
+				Spec: toolchainv1alpha1.BannedUserSpec{
+					Email: "bob@redhat.com",
+				},
+			},
+			"bob-dup": {
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      "bob-dup",
+					Namespace: configuration.Namespace(),
+					Labels: map[string]string{
+						toolchainv1alpha1.BannedUserEmailHashLabelKey: hash.EncodeString("bob@redhat.com"),
+					},
+				},
+				Spec: toolchainv1alpha1.BannedUserSpec{
+					Email: "bob@redhat.com",
+				},
+			},
+		}
+
+		// convert to unstructured.Unstructured for fakeLister
+		bbu := make(map[string]*unstructured.Unstructured, len(bb))
+		for k, b := range bb {
+			bu, err := runtime.DefaultUnstructuredConverter.ToUnstructured(b.DeepCopy())
+			require.NoError(s.T(), err)
+			bbu[k] = &unstructured.Unstructured{Object: bu}
+		}
+
+		// setup InformerService with fakeLister
+		inf := informers.Informer{BannedUsers: fakeLister{objs: bbu}}
+		svc := service.NewInformerService(fakeInformerServiceContext{
+			Svcs:     s.Application,
+			informer: inf,
+		})
+
+		s.Run("not found", func() {
+			// when
+			rbb, err := svc.ListBannedUsersByEmail("unknown@unknown.com")
+
+			// then
+			require.NoError(s.T(), err)
+			require.Empty(s.T(), rbb)
+		})
+
+		s.Run("invalid email", func() {
+			// when
+			rbb, err := svc.ListBannedUsersByEmail("not-an-email")
+
+			// then
+			require.NoError(s.T(), err)
+			require.Empty(s.T(), rbb)
+		})
+
+		s.Run("found one", func() {
+			// given
+			expected := bb["alice"]
+
+			// when
+			rbb, err := svc.ListBannedUsersByEmail(expected.Spec.Email)
+
+			// then
+			require.NotNil(s.T(), rbb)
+			require.NoError(s.T(), err)
+			require.Len(s.T(), rbb, 1, "expected 1 result for email %s", expected.Spec.Email)
+			require.Equal(s.T(), expected, rbb[0])
+		})
+
+		s.Run("found multiple", func() {
+			// given
+			expected := []toolchainv1alpha1.BannedUser{bb["bob"], bb["bob-dup"]}
+
+			// when
+			rbb, err := svc.ListBannedUsersByEmail(expected[0].Spec.Email)
+
+			// then
+			require.NotNil(s.T(), rbb)
+			require.NoError(s.T(), err)
+			require.Len(s.T(), rbb, 2, "expected 2 results for email %s", expected[0].Spec.Email)
+			require.Equal(s.T(), expected, rbb)
+		})
+	})
 }
 
 type fakeInformerServiceContext struct {
@@ -410,8 +515,15 @@ type fakeLister struct {
 }
 
 // List will return all objects across namespaces
-func (l fakeLister) List(_ labels.Selector) (ret []runtime.Object, err error) {
-	return nil, nil
+func (l fakeLister) List(ls labels.Selector) (ret []runtime.Object, err error) {
+	objs := []runtime.Object{}
+	for _, o := range l.objs {
+		ll := labels.Set(o.GetLabels())
+		if ls.Matches(ll) {
+			objs = append(objs, o)
+		}
+	}
+	return objs, nil
 }
 
 // Get will attempt to retrieve assuming that name==key

pkg/kubeclient/resources/names.go

@@ -9,4 +9,5 @@ const (
 	ToolchainStatusName        = "toolchain-status"
 	ProxyPluginsPlural         = "proxyplugins"
 	NSTemplateTierPlural       = "nstemplatetiers"
+	BannedUserResourcePlural   = "bannedusers"
 )

pkg/proxy/proxy.go

@@ -118,6 +118,7 @@
 				return next(ctx)
 			}
 		},
+		p.ensureUserIsNotBanned(),
 	)
 
 	// middleware after routing
@@ -391,18 +392,52 @@
 				return next(ctx)
 			}
 
-			userID, username, err := p.extractUserID(ctx.Request())
+			token, err := p.extractUserToken(ctx.Request())
 			if err != nil {
 				return crterrors.NewUnauthorizedError("invalid bearer token", err.Error())
 			}
-			ctx.Set(context.SubKey, userID)
-			ctx.Set(context.UsernameKey, username)
+			ctx.Set(context.SubKey, token.Subject)
+			ctx.Set(context.UsernameKey, token.PreferredUsername)
+			ctx.Set(context.EmailKey, token.Email)
 
 			return next(ctx)
 		}
 	}
 }
 
+// ensureUserIsNotBanned rejects the request if the user is banned.
+// This Middleware requires the context to contain the email of the user,
+// so it needs to be executed after the `addUserContext` Middleware.
+func (p *Proxy) ensureUserIsNotBanned() echo.MiddlewareFunc {
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(ctx echo.Context) error {
+			if unsecured(ctx) { // skip only for unsecured endpoints
+				return next(ctx)
+			}
+
+			email := ctx.Get(context.EmailKey).(string)
+			if email == "" {
+				return crterrors.NewUnauthorizedError("unauthenticated request", "invalid email in token")
+			}
+
+			// retrieve banned users
+			uu, err := p.app.InformerService().ListBannedUsersByEmail(email)
+			if err != nil {
+				ctx.Logger().Errorf("error retrieving the list of banned users with email address %s: %v", email, err)
+				return crterrors.NewInternalError(errs.New("user access could not be verified"), "could not define user access")
+			}
+
+			// if a matching Banned user is found, then user is banned
+			if len(uu) > 0 {
+				return crterrors.NewForbiddenError("user access is forbidden", "user access is forbidden")
+			}
+
+			// user is not banned
+			return next(ctx)
+		}
+	}
+}
+
 func (p *Proxy) stripInvalidHeaders() echo.MiddlewareFunc {
 	return func(next echo.HandlerFunc) echo.HandlerFunc {
 		return func(ctx echo.Context) error {
@@ -430,26 +465,26 @@
 	}
 }
 
-func (p *Proxy) extractUserID(req *http.Request) (string, string, error) {
+func (p *Proxy) extractUserToken(req *http.Request) (*auth.TokenClaims, error) {
 	userToken := ""
 	var err error
 	if wsstream.IsWebSocketRequest(req) {
 		userToken, err = extractTokenFromWebsocketRequest(req)
 		if err != nil {
-			return "", "", err
+			return nil, err
 		}
 	} else {
 		userToken, err = extractUserToken(req)
 		if err != nil {
-			return "", "", err
+			return nil, err
 		}
 	}
 
 	token, err := p.tokenParser.FromString(userToken)
 	if err != nil {
-		return "", "", crterrors.NewUnauthorizedError("unable to extract userID from token", err.Error())
+		return nil, crterrors.NewUnauthorizedError("unable to extract userID from token", err.Error())
 	}
-	return token.Subject, token.PreferredUsername, nil
+	return token, nil
 }
 
 func extractUserToken(req *http.Request) (string, error) {