KEP-4633: Add intgration tests for Anonymous Auth Configurable Endpoints.

Signed-off-by: Vinayak Goyal <vinaygo@google.com>

test/integration/apiserver/anonymous/anonymous_test.go

@@ -0,0 +1,241 @@
+/*
+Copyright 2024 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package anonymous
+
+import (
+	"context"
+	"crypto/tls"
+	"fmt"
+	"net/http"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	rbacv1 "k8s.io/api/rbac/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apiserver/pkg/features"
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	"k8s.io/client-go/kubernetes"
+	_ "k8s.io/client-go/plugin/pkg/client/auth/oidc"
+	featuregatetesting "k8s.io/component-base/featuregate/testing"
+	kubeapiserverapptesting "k8s.io/kubernetes/cmd/kube-apiserver/app/testing"
+	"k8s.io/kubernetes/pkg/apis/rbac"
+	"k8s.io/kubernetes/test/integration/authutil"
+	"k8s.io/kubernetes/test/integration/framework"
+)
+
+const (
+	defaultNamespace           = "default"
+	defaultRBACRoleName        = "developer-role"
+	defaultRBACRoleBindingName = "developer-role-binding"
+	anonymousUser              = "system:anonymous"
+)
+
+var (
+	defaultRole = &rbacv1.Role{
+		TypeMeta:   metav1.TypeMeta{APIVersion: "rbac.authorization.k8s.io/v1", Kind: "Role"},
+		ObjectMeta: metav1.ObjectMeta{Name: defaultRBACRoleName, Namespace: defaultNamespace},
+		Rules: []rbacv1.PolicyRule{
+			{
+				Verbs:     []string{"list"},
+				Resources: []string{"pods"},
+				APIGroups: []string{""},
+			},
+		},
+	}
+	defaultRoleBinding = &rbacv1.RoleBinding{
+		TypeMeta:   metav1.TypeMeta{APIVersion: "rbac.authorization.k8s.io/v1", Kind: "RoleBinding"},
+		ObjectMeta: metav1.ObjectMeta{Name: defaultRBACRoleBindingName, Namespace: defaultNamespace},
+		Subjects: []rbacv1.Subject{
+			{
+				APIGroup: rbac.GroupName,
+				Kind:     rbacv1.UserKind,
+				Name:     anonymousUser,
+			},
+		},
+		RoleRef: rbacv1.RoleRef{
+			APIGroup: rbac.GroupName,
+			Kind:     "Role",
+			Name:     defaultRBACRoleName,
+		},
+	}
+)
+
+func TestStructuredAuthenticationConfig(t *testing.T) {
+	t.Log("Testing anonymous authenticator with authentication config")
+
+	featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.StructuredAuthenticationConfiguration, true)
+	featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.AnonymousAuthConfigurableEndpoints, true)
+
+	testCases := []struct {
+		desc            string
+		authConfig      string
+		additionalFlags []string
+		assertErrFn     func(t *testing.T, errorToCheck error)
+		assertFn        func(t *testing.T, server kubeapiserverapptesting.TestServer)
+	}{
+		{
+			desc: "valid config no conditions",
+			authConfig: `
+apiVersion: apiserver.config.k8s.io/v1beta1
+kind: AuthenticationConfiguration
+anonymous:
+  enabled: true
+`,
+			assertErrFn: func(t *testing.T, errorToCheck error) {
+				require.NoError(t, errorToCheck)
+			},
+			assertFn: func(t *testing.T, server kubeapiserverapptesting.TestServer) {
+				configureRBAC(t, server)
+
+				client := insecureHTTPClient(t)
+
+				resp, err := client.Get(server.ClientConfig.Host + "/api/v1/namespaces/default/pods")
+				require.NoError(t, err)
+				defer resp.Body.Close() //nolint:errcheck
+				require.Equal(t, 200, resp.StatusCode)
+
+				resp, err = client.Get(server.ClientConfig.Host + "/livez")
+				require.NoError(t, err)
+				defer resp.Body.Close() //nolint:errcheck
+				require.Equal(t, 200, resp.StatusCode)
+
+				resp, err = client.Get(server.ClientConfig.Host + "/healthz")
+				require.NoError(t, err)
+				defer resp.Body.Close() //nolint:errcheck
+				require.Equal(t, 200, resp.StatusCode)
+
+			},
+			additionalFlags: nil,
+		},
+		{
+			desc: "valid config with conditions",
+			authConfig: `
+apiVersion: apiserver.config.k8s.io/v1beta1
+kind: AuthenticationConfiguration
+anonymous:
+  enabled: true
+  conditions:
+  - path: "/livez"
+`,
+			assertErrFn: func(t *testing.T, errorToCheck error) {
+				require.NoError(t, errorToCheck)
+			},
+			assertFn: func(t *testing.T, server kubeapiserverapptesting.TestServer) {
+				client := insecureHTTPClient(t)
+
+				resp, err := client.Get(server.ClientConfig.Host + "/api/v1/namespaces/default/pods")
+				require.NoError(t, err)
+				defer resp.Body.Close() //nolint:errcheck
+				require.Equal(t, 401, resp.StatusCode)
+
+				resp, err = client.Get(server.ClientConfig.Host + "/livez")
+				require.NoError(t, err)
+				defer resp.Body.Close() //nolint:errcheck
+				require.Equal(t, 200, resp.StatusCode)
+
+				resp, err = client.Get(server.ClientConfig.Host + "/healthz")
+				require.NoError(t, err)
+				defer resp.Body.Close() //nolint:errcheck
+				require.Equal(t, 401, resp.StatusCode)
+
+			},
+			additionalFlags: nil,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.desc, func(t *testing.T) {
+			flags := []string{"--authorization-mode=RBAC"}
+			flags = append(flags, fmt.Sprintf("--authentication-config=%s", writeTempFile(t, tc.authConfig)))
+			flags = append(flags, tc.additionalFlags...)
+
+			server, err := kubeapiserverapptesting.StartTestServer(
+				t,
+				kubeapiserverapptesting.NewDefaultTestServerOptions(),
+				flags,
+				framework.SharedEtcd(),
+			)
+
+			tc.assertErrFn(t, err)
+
+			if tc.assertFn == nil {
+				return
+			}
+
+			defer server.TearDownFn()
+
+			tc.assertFn(t, server)
+		})
+	}
+}
+
+func TestMain(m *testing.M) {
+	framework.EtcdMain(m.Run)
+}
+
+func writeTempFile(t *testing.T, content string) string {
+	t.Helper()
+	file, err := os.CreateTemp("", "anonymous-auth-test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		if err := os.Remove(file.Name()); err != nil {
+			t.Fatal(err)
+		}
+	})
+	if err := os.WriteFile(file.Name(), []byte(content), 0600); err != nil {
+		t.Fatal(err)
+	}
+	return file.Name()
+}
+
+func configureRBAC(t *testing.T, server kubeapiserverapptesting.TestServer) {
+	t.Helper()
+
+	kc := kubernetes.NewForConfigOrDie(server.ClientConfig)
+
+	_, err := kc.RbacV1().Roles(defaultNamespace).Create(context.Background(), defaultRole, metav1.CreateOptions{})
+	require.NoError(t, err)
+
+	_, err = kc.RbacV1().RoleBindings(defaultNamespace).Create(context.Background(), defaultRoleBinding, metav1.CreateOptions{})
+	require.NoError(t, err)
+
+	authutil.WaitForNamedAuthorizationUpdate(
+		t,
+		context.Background(),
+		kc.AuthorizationV1(),
+		anonymousUser,
+		defaultNamespace, // namespace
+		"list",
+		"", // resource name
+		schema.GroupResource{Group: "", Resource: "pods"},
+		true,
+	)
+}
+
+func insecureHTTPClient(t *testing.T) *http.Client {
+	t.Helper()
+
+	return &http.Client{
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+		},
+	}
+}