concierge_impersonation_proxy_test.go: Make it work on more clusters
Should work on cluster which have: - load balancers not supported, has squid proxy (e.g. kind) - load balancers supported, has squid proxy (e.g. EKS) - load balancers supported, no squid proxy (e.g. GKE) When testing with a load balancer, call the impersonation proxy through the load balancer. Also, added a new library.RequireNeverWithoutError() helper. Signed-off-by: Margo Crawford <margaretc@vmware.com>
This commit is contained in:
Ryan Richard
parent
f937ae2c07
commit
3fcde8088c
@ -33,14 +33,15 @@ const (
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// TODO don't hard code "pinniped-concierge-" in these strings. It should be constructed from the env app name.
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impersonationProxyConfigMapName = "pinniped-concierge-impersonation-proxy-config"
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impersonationProxyTLSSecretName = "pinniped-concierge-impersonation-proxy-tls-serving-certificate" //nolint:gosec // this is not a credential
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impersonationProxyLoadBalancerName = "pinniped-concierge-impersonation-proxy-load-balancer"
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)
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// Note that this test supports being run on all of our integration test cluster types:
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// - load balancers not supported, has squid proxy (e.g. kind)
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// - load balancers supported, has squid proxy (e.g. EKS)
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// - load balancers supported, no squid proxy (e.g. GKE)
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func TestImpersonationProxy(t *testing.T) {
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env := library.IntegrationEnv(t)
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if env.Proxy == "" {
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t.Skip("this test can only run in environments with the in-cluster proxy right now")
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return
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}
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Minute)
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defer cancel()
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@ -51,14 +52,15 @@ func TestImpersonationProxy(t *testing.T) {
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// Create a WebhookAuthenticator.
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authenticator := library.CreateTestWebhookAuthenticator(ctx, t)
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// The address of the ClusterIP service that points at the impersonation proxy's port
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// The address of the ClusterIP service that points at the impersonation proxy's port (used when there is no load balancer).
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proxyServiceEndpoint := fmt.Sprintf("%s-proxy.%s.svc.cluster.local", env.ConciergeAppName, env.ConciergeNamespace)
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proxyServiceURL := fmt.Sprintf("https://%s", proxyServiceEndpoint)
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t.Logf("making kubeconfig that points to %q", proxyServiceURL)
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// The error message that will be returned by squid when the impersonation proxy port inside the cluster is not listening.
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serviceUnavailableViaSquidError := fmt.Sprintf(`Get "https://%s/api/v1/namespaces": Service Unavailable`, proxyServiceEndpoint)
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getImpersonationProxyClient := func(caData []byte) *kubernetes.Clientset {
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impersonationProxyViaSquidClient := func(caData []byte) *kubernetes.Clientset {
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t.Helper()
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kubeconfig := &rest.Config{
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Host: proxyServiceURL,
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Host: fmt.Sprintf("https://%s", proxyServiceEndpoint),
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TLSClientConfig: rest.TLSClientConfig{Insecure: caData == nil, CAData: caData},
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BearerToken: impersonationtoken.Make(t, env.TestUser.Token, &authenticator, env.APIGroupSuffix),
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Proxy: func(req *http.Request) (*url.URL, error) {
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@ -68,37 +70,68 @@ func TestImpersonationProxy(t *testing.T) {
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return proxyURL, nil
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},
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}
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impersonationProxyClient, err := kubernetes.NewForConfig(kubeconfig)
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require.NoError(t, err, "unexpected failure from kubernetes.NewForConfig()")
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return impersonationProxyClient
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}
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impersonationProxyViaLoadBalancerClient := func(host string, caData []byte) *kubernetes.Clientset {
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t.Helper()
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kubeconfig := &rest.Config{
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Host: fmt.Sprintf("https://%s", host),
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TLSClientConfig: rest.TLSClientConfig{Insecure: caData == nil, CAData: caData},
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BearerToken: impersonationtoken.Make(t, env.TestUser.Token, &authenticator, env.APIGroupSuffix),
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}
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impersonationProxyClient, err := kubernetes.NewForConfig(kubeconfig)
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require.NoError(t, err, "unexpected failure from kubernetes.NewForConfig()")
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return impersonationProxyClient
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}
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oldConfigMap, err := adminClient.CoreV1().ConfigMaps(env.ConciergeNamespace).Get(ctx, impersonationProxyConfigMapName, metav1.GetOptions{})
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if oldConfigMap.Data != nil {
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if !k8serrors.IsNotFound(err) {
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require.NoError(t, err) // other errors aside from NotFound are unexpected
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t.Logf("stashing a pre-existing configmap %s", oldConfigMap.Name)
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require.NoError(t, adminClient.CoreV1().ConfigMaps(env.ConciergeNamespace).Delete(ctx, impersonationProxyConfigMapName, metav1.DeleteOptions{}))
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}
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serviceUnavailableError := fmt.Sprintf(`Get "%s/api/v1/namespaces": Service Unavailable`, proxyServiceURL)
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insecureImpersonationProxyClient := getImpersonationProxyClient(nil)
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impersonationProxyLoadBalancerIngress := ""
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if env.HasCapability(library.HasExternalLoadBalancerProvider) {
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// Check that load balancer has been created
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require.Eventually(t, func() bool {
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return hasLoadBalancerService(ctx, t, adminClient, env.ConciergeNamespace)
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if env.HasCapability(library.HasExternalLoadBalancerProvider) { //nolint:nestif // come on... it's just a test
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// Check that load balancer has been created.
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library.RequireEventuallyWithoutError(t, func() (bool, error) {
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return hasImpersonationProxyLoadBalancerService(ctx, adminClient, env.ConciergeNamespace)
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}, 10*time.Second, 500*time.Millisecond)
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// Wait for the load balancer to get an ingress and make a note of its address.
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var ingress *corev1.LoadBalancerIngress
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library.RequireEventuallyWithoutError(t, func() (bool, error) {
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ingress, err = getImpersonationProxyLoadBalancerIngress(ctx, adminClient, env.ConciergeNamespace)
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if err != nil {
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return false, err
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}
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return ingress != nil, nil
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}, 10*time.Second, 500*time.Millisecond)
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if ingress.Hostname != "" {
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impersonationProxyLoadBalancerIngress = ingress.Hostname
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} else {
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// Check that no load balancer has been created
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require.Never(t, func() bool {
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return hasLoadBalancerService(ctx, t, adminClient, env.ConciergeNamespace)
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require.NotEmpty(t, ingress.IP, "the ingress should have either a hostname or IP, but it didn't")
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impersonationProxyLoadBalancerIngress = ingress.IP
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}
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} else {
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require.NotEmpty(t, env.Proxy,
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"test cluster does not support load balancers but also doesn't have a squid proxy... "+
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"this is not a supported configuration for test clusters")
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// Check that no load balancer has been created.
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library.RequireNeverWithoutError(t, func() (bool, error) {
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return hasImpersonationProxyLoadBalancerService(ctx, adminClient, env.ConciergeNamespace)
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}, 10*time.Second, 500*time.Millisecond)
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// Check that we can't use the impersonation proxy to execute kubectl commands yet
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_, err = insecureImpersonationProxyClient.CoreV1().Namespaces().List(ctx, metav1.ListOptions{})
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require.EqualError(t, err, serviceUnavailableError)
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// Check that we can't use the impersonation proxy to execute kubectl commands yet.
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_, err = impersonationProxyViaSquidClient(nil).CoreV1().Namespaces().List(ctx, metav1.ListOptions{})
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require.EqualError(t, err, serviceUnavailableViaSquidError)
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// Create configuration to make the impersonation proxy turn on with a hard coded endpoint (without a LoadBalancer)
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// Create configuration to make the impersonation proxy turn on with a hard coded endpoint (without a LoadBalancer).
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configMap := configMapForConfig(t, impersonator.Config{
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Mode: impersonator.ModeEnabled,
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Endpoint: proxyServiceEndpoint,
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@ -108,6 +141,7 @@ func TestImpersonationProxy(t *testing.T) {
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_, err = adminClient.CoreV1().ConfigMaps(env.ConciergeNamespace).Create(ctx, &configMap, metav1.CreateOptions{})
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require.NoError(t, err)
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// At the end of the test, clean up the ConfigMap.
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t.Cleanup(func() {
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ctx, cancel = context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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@ -134,8 +168,17 @@ func TestImpersonationProxy(t *testing.T) {
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return caSecret != nil && caSecret.Data["ca.crt"] != nil
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}, 5*time.Minute, 250*time.Millisecond)
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// Create an impersonation proxy client with that ca data.
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impersonationProxyClient := getImpersonationProxyClient(caSecret.Data["ca.crt"])
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// Create an impersonation proxy client with that CA data to use for the rest of this test.
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// This client performs TLS checks, so it also provides test coverage that the impersonation proxy server is generating TLS certs correctly.
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var impersonationProxyClient *kubernetes.Clientset
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if env.HasCapability(library.HasExternalLoadBalancerProvider) {
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impersonationProxyClient = impersonationProxyViaLoadBalancerClient(impersonationProxyLoadBalancerIngress, caSecret.Data["ca.crt"])
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} else {
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impersonationProxyClient = impersonationProxyViaSquidClient(caSecret.Data["ca.crt"])
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}
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// Test that the user can perform basic actions through the client with their username and group membership
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// influencing RBAC checks correctly.
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t.Run(
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"access as user",
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library.AccessAsUserTest(ctx, env.TestUser.ExpectedUsername, impersonationProxyClient),
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@ -148,13 +191,14 @@ func TestImpersonationProxy(t *testing.T) {
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)
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}
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t.Run("watching all the verbs", func(t *testing.T) {
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// Create a namespace, because it will be easier to deletecollection if we have a namespace.
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// t.Cleanup Delete the namespace.
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// Try more Kube API verbs through the impersonation proxy.
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t.Run("watching all the basic verbs", func(t *testing.T) {
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// Create a namespace, because it will be easier to exercise deletecollection if we have a namespace.
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namespace, err := adminClient.CoreV1().Namespaces().Create(ctx, &corev1.Namespace{
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ObjectMeta: metav1.ObjectMeta{GenerateName: "impersonation-integration-test-"},
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}, metav1.CreateOptions{})
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require.NoError(t, err)
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// Schedule the namespace for cleanup.
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t.Cleanup(func() {
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t.Logf("cleaning up test namespace %s", namespace.Name)
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err = adminClient.CoreV1().Namespaces().Delete(context.Background(), namespace.Name, metav1.DeleteOptions{})
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@ -175,6 +219,7 @@ func TestImpersonationProxy(t *testing.T) {
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Name: "cluster-admin",
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},
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)
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// Wait for the above RBAC rule to take effect.
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library.WaitForUserToHaveAccess(t, env.TestUser.ExpectedUsername, []string{}, &v1.ResourceAttributes{
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Namespace: namespace.Name,
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Verb: "create",
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@ -183,7 +228,7 @@ func TestImpersonationProxy(t *testing.T) {
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Resource: "configmaps",
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})
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// Create and start informer.
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// Create and start informer to exercise the "watch" verb for us.
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informerFactory := k8sinformers.NewSharedInformerFactoryWithOptions(
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impersonationProxyClient,
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0,
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@ -198,10 +243,13 @@ func TestImpersonationProxy(t *testing.T) {
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})
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informerFactory.WaitForCacheSync(ctx.Done())
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// Test "create" verb through the impersonation proxy.
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// Use labels on our created ConfigMaps to avoid accidentally listing other ConfigMaps that might
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// exist in the namespace. In Kube 1.20+ there is a default ConfigMap in every namespace.
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configMapLabels := labels.Set{
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"pinniped.dev/testConfigMap": library.RandHex(t, 8),
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}
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// Test "create" verb through the impersonation proxy.
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_, err = impersonationProxyClient.CoreV1().ConfigMaps(namespace.Name).Create(ctx,
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&corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Name: "configmap-1", Labels: configMapLabels}},
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metav1.CreateOptions{},
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@ -244,8 +292,7 @@ func TestImpersonationProxy(t *testing.T) {
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require.NoError(t, err)
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require.Equal(t, "bar", updateResult.Data["foo"])
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// Make sure that the updated ConfigMap shows up in the informer's cache to
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// demonstrate that the informer's "watch" verb is working through the impersonation proxy.
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// Make sure that the updated ConfigMap shows up in the informer's cache.
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require.Eventually(t, func() bool {
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configMap, err := informer.Lister().ConfigMaps(namespace.Name).Get("configmap-3")
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return err == nil && configMap.Data["foo"] == "bar"
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@ -262,8 +309,7 @@ func TestImpersonationProxy(t *testing.T) {
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require.Equal(t, "bar", patchResult.Data["foo"])
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require.Equal(t, "42", patchResult.Data["baz"])
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// Make sure that the patched ConfigMap shows up in the informer's cache to
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// demonstrate that the informer's "watch" verb is working through the impersonation proxy.
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// Make sure that the patched ConfigMap shows up in the informer's cache.
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require.Eventually(t, func() bool {
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configMap, err := informer.Lister().ConfigMaps(namespace.Name).Get("configmap-3")
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return err == nil && configMap.Data["foo"] == "bar" && configMap.Data["baz"] == "42"
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@ -273,8 +319,7 @@ func TestImpersonationProxy(t *testing.T) {
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err = impersonationProxyClient.CoreV1().ConfigMaps(namespace.Name).Delete(ctx, "configmap-3", metav1.DeleteOptions{})
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require.NoError(t, err)
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// Make sure that the deleted ConfigMap shows up in the informer's cache to
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// demonstrate that the informer's "watch" verb is working through the impersonation proxy.
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// Make sure that the deleted ConfigMap shows up in the informer's cache.
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require.Eventually(t, func() bool {
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_, getErr := informer.Lister().ConfigMaps(namespace.Name).Get("configmap-3")
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list, listErr := informer.Lister().ConfigMaps(namespace.Name).List(configMapLabels.AsSelector())
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@ -285,13 +330,13 @@ func TestImpersonationProxy(t *testing.T) {
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err = impersonationProxyClient.CoreV1().ConfigMaps(namespace.Name).DeleteCollection(ctx, metav1.DeleteOptions{}, metav1.ListOptions{})
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require.NoError(t, err)
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// Make sure that the deleted ConfigMaps shows up in the informer's cache to
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// demonstrate that the informer's "watch" verb is working through the impersonation proxy.
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// Make sure that the deleted ConfigMaps shows up in the informer's cache.
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require.Eventually(t, func() bool {
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list, listErr := informer.Lister().ConfigMaps(namespace.Name).List(configMapLabels.AsSelector())
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return listErr == nil && len(list) == 0
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}, 10*time.Second, 50*time.Millisecond)
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// There should be no ConfigMaps left.
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listResult, err = impersonationProxyClient.CoreV1().ConfigMaps(namespace.Name).List(ctx, metav1.ListOptions{
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LabelSelector: configMapLabels.String(),
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})
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@ -311,22 +356,30 @@ func TestImpersonationProxy(t *testing.T) {
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require.NoError(t, err)
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}
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// Check that the impersonation proxy has shut down
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require.Eventually(t, func() bool {
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// It's okay if this returns RBAC errors because this user has no role bindings.
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// What we want to see is that the proxy eventually shuts down entirely.
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_, err = insecureImpersonationProxyClient.CoreV1().Namespaces().List(ctx, metav1.ListOptions{})
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return err.Error() == serviceUnavailableError
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}, 20*time.Second, 500*time.Millisecond)
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if env.HasCapability(library.HasExternalLoadBalancerProvider) {
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// The load balancer should not exist after we disable the impersonation proxy.
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// Note that this can take kind of a long time on real cloud providers (e.g. ~22 seconds on EKS).
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require.Eventually(t, func() bool {
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return !hasLoadBalancerService(ctx, t, adminClient, env.ConciergeNamespace)
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library.RequireEventuallyWithoutError(t, func() (bool, error) {
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hasService, err := hasImpersonationProxyLoadBalancerService(ctx, adminClient, env.ConciergeNamespace)
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return !hasService, err
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}, time.Minute, 500*time.Millisecond)
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}
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// Check that the impersonation proxy port has shut down.
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// Ideally we could always check that the impersonation proxy's port has shut down, but on clusters where we
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// do not run the squid proxy we have no easy way to see beyond the load balancer to see inside the cluster,
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// so we'll skip this check on clusters which have load balancers but don't run the squid proxy.
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// The other cluster types that do run the squid proxy will give us sufficient coverage here.
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if env.Proxy != "" {
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require.Eventually(t, func() bool {
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// It's okay if this returns RBAC errors because this user has no role bindings.
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// What we want to see is that the proxy eventually shuts down entirely.
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_, err = impersonationProxyViaSquidClient(nil).CoreV1().Namespaces().List(ctx, metav1.ListOptions{})
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return err.Error() == serviceUnavailableViaSquidError
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}, 20*time.Second, 500*time.Millisecond)
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}
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// Check that the generated TLS cert Secret was deleted by the controller.
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require.Eventually(t, func() bool {
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caSecret, err = adminClient.CoreV1().Secrets(env.ConciergeNamespace).Get(ctx, impersonationProxyTLSSecretName, metav1.GetOptions{})
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return k8serrors.IsNotFound(err)
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@ -346,15 +399,28 @@ func configMapForConfig(t *testing.T, config impersonator.Config) corev1.ConfigM
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return configMap
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}
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func hasLoadBalancerService(ctx context.Context, t *testing.T, client kubernetes.Interface, namespace string) bool {
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t.Helper()
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func hasImpersonationProxyLoadBalancerService(ctx context.Context, client kubernetes.Interface, namespace string) (bool, error) {
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service, err := client.CoreV1().Services(namespace).Get(ctx, impersonationProxyLoadBalancerName, metav1.GetOptions{})
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if k8serrors.IsNotFound(err) {
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return false, nil
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}
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if err != nil {
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return false, err
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}
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return service.Spec.Type == corev1.ServiceTypeLoadBalancer, nil
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}
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services, err := client.CoreV1().Services(namespace).List(ctx, metav1.ListOptions{})
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require.NoError(t, err)
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for _, service := range services.Items {
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if service.Spec.Type == corev1.ServiceTypeLoadBalancer {
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return true
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func getImpersonationProxyLoadBalancerIngress(ctx context.Context, client kubernetes.Interface, namespace string) (*corev1.LoadBalancerIngress, error) {
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service, err := client.CoreV1().Services(namespace).Get(ctx, impersonationProxyLoadBalancerName, metav1.GetOptions{})
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if err != nil {
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return nil, err
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}
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ingresses := service.Status.LoadBalancer.Ingress
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if len(ingresses) > 1 {
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return nil, fmt.Errorf("didn't expect multiple ingresses, but if it happens then maybe this test needs to be adjusted")
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}
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return false
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if len(ingresses) == 0 {
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return nil, nil
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}
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return &ingresses[0], nil
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}
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@ -5,6 +5,7 @@ package library
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import (
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"context"
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"errors"
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"fmt"
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"testing"
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"time"
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@ -15,7 +16,7 @@ import (
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"k8s.io/apimachinery/pkg/util/wait"
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)
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// RequireEventuallyWithoutError is a wrapper around require.Eventually() that allows the caller to
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// RequireEventuallyWithoutError is similar to require.Eventually() except that it also allows the caller to
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// return an error from the condition function. If the condition function returns an error at any
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// point, the assertion will immediately fail.
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func RequireEventuallyWithoutError(
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@ -29,6 +30,28 @@ func RequireEventuallyWithoutError(
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require.NoError(t, wait.PollImmediate(tick, waitFor, f), msgAndArgs...)
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}
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// RequireNeverWithoutError is similar to require.Never() except that it also allows the caller to
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// return an error from the condition function. If the condition function returns an error at any
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// point, the assertion will immediately fail.
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func RequireNeverWithoutError(
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t *testing.T,
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f func() (bool, error),
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waitFor time.Duration,
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tick time.Duration,
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||||
msgAndArgs ...interface{},
|
||||
) {
|
||||
t.Helper()
|
||||
err := wait.PollImmediate(tick, waitFor, f)
|
||||
isWaitTimeout := errors.Is(err, wait.ErrWaitTimeout)
|
||||
if err != nil && !isWaitTimeout {
|
||||
require.NoError(t, err, msgAndArgs...) // this will fail and throw the right error message
|
||||
}
|
||||
if err == nil {
|
||||
// This prints the same error message that require.Never would print in this case.
|
||||
require.Fail(t, "Condition satisfied", msgAndArgs...)
|
||||
}
|
||||
}
|
||||
|
||||
// NewRestartAssertion allows a caller to assert that there were no restarts for a Pod in the
|
||||
// provided namespace with the provided labelSelector during the lifetime of a test.
|
||||
func AssertNoRestartsDuringTest(t *testing.T, namespace, labelSelector string) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user