Adding ipdenylist annotation (#8795)

* feat: Add support for IP Deny List

* fixed gomod

* Update package

* go mod tidy

* Revert "go mod tidy"

This reverts commit e6a837e1e76d72115e8727a33d2f4c1cd7249f1f.

* update ginko version

* Updates e2e tests

* fix test typo

test/e2e/annotations/ipdenylist.go

@@ -0,0 +1,147 @@
+/*
+Copyright 2023 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 annotations
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/onsi/ginkgo/v2"
+
+	"k8s.io/ingress-nginx/test/e2e/framework"
+)
+
+var _ = framework.DescribeAnnotation("denylist-source-range", func() {
+	f := framework.NewDefaultFramework("ipdenylist")
+
+	ginkgo.BeforeEach(func() {
+		f.NewEchoDeployment()
+	})
+
+	ginkgo.It("only deny explicitly denied IPs, allow all others", func() {
+		host := "ipdenylist.foo.com"
+		namespace := f.Namespace
+
+		annotations := map[string]string{
+			"nginx.ingress.kubernetes.io/denylist-source-range": "18.0.0.0/8, 56.0.0.1",
+		}
+
+		ing := framework.NewSingleIngress(host, "/", host, namespace, framework.EchoService, 80, annotations)
+
+		// Temporarily trust forwarded headers so we can test IP based access control
+		f.UpdateNginxConfigMapData("use-forwarded-headers", "true")
+		defer func() {
+			// Return to the original value
+			f.UpdateNginxConfigMapData("use-forwarded-headers", "false")
+		}()
+
+		f.EnsureIngress(ing)
+
+		f.WaitForNginxServer(host,
+			func(server string) bool {
+				return strings.Contains(server, "deny 18.0.0.0/8;") &&
+					strings.Contains(server, "deny 56.0.0.1;") &&
+					!strings.Contains(server, "deny all;")
+			})
+
+		ginkgo.By("sending request from an explicitly denied IP range")
+		f.HTTPTestClient().
+			GET("/").
+			WithHeader("Host", host).
+			WithHeader("X-Forwarded-For", "18.0.0.1").
+			Expect().
+			Status(http.StatusForbidden)
+
+		ginkgo.By("sending request from an explicitly denied IP address")
+		f.HTTPTestClient().
+			GET("/").
+			WithHeader("Host", host).
+			WithHeader("X-Forwarded-For", "56.0.0.1").
+			Expect().
+			Status(http.StatusForbidden)
+
+		ginkgo.By("sending request from an implicitly allowed IP range")
+		f.HTTPTestClient().
+			GET("/").
+			WithHeader("Host", host).
+			WithHeader("X-Forwarded-For", "56.0.0.2").
+			Expect().
+			Status(http.StatusOK)
+	})
+
+	ginkgo.It("only allow explicitly allowed IPs, deny all others", func() {
+		host := "ipdenylist.foo.com"
+		namespace := f.Namespace
+
+		annotations := map[string]string{
+			"nginx.ingress.kubernetes.io/denylist-source-range":  "18.1.0.0/16, 56.0.0.0/8",
+			"nginx.ingress.kubernetes.io/whitelist-source-range": "18.0.0.0/8, 55.0.0.0/8",
+		}
+
+		ing := framework.NewSingleIngress(host, "/", host, namespace, framework.EchoService, 80, annotations)
+
+		// Temporarily trust forwarded headers so we can test IP based access control
+		f.UpdateNginxConfigMapData("use-forwarded-headers", "true")
+		defer func() {
+			// Return to the original value
+			f.UpdateNginxConfigMapData("use-forwarded-headers", "false")
+		}()
+
+		f.EnsureIngress(ing)
+
+		f.WaitForNginxServer(host,
+			func(server string) bool {
+				return strings.Contains(server, "deny 18.1.0.0/16;") &&
+					strings.Contains(server, "deny 56.0.0.0/8;") &&
+					strings.Contains(server, "allow 18.0.0.0/8;") &&
+					strings.Contains(server, "allow 55.0.0.0/8;") &&
+					strings.Contains(server, "deny all;")
+			})
+
+		ginkgo.By("sending request from an explicitly denied IP range")
+		f.HTTPTestClient().
+			GET("/").
+			WithHeader("Host", host).
+			WithHeader("X-Forwarded-For", "18.1.0.1").
+			Expect().
+			Status(http.StatusForbidden)
+
+		ginkgo.By("sending request from an implicitly denied IP")
+		f.HTTPTestClient().
+			GET("/").
+			WithHeader("Host", host).
+			WithHeader("X-Forwarded-For", "10.10.10.10").
+			Expect().
+			Status(http.StatusForbidden)
+
+		ginkgo.By("sending request from an explicitly allowed IP range")
+		f.HTTPTestClient().
+			GET("/").
+			WithHeader("Host", host).
+			WithHeader("X-Forwarded-For", "18.4.0.1").
+			Expect().
+			Status(http.StatusOK)
+
+		ginkgo.By("sending request from an explicitly allowed IP range")
+		f.HTTPTestClient().
+			GET("/").
+			WithHeader("Host", host).
+			WithHeader("X-Forwarded-For", "55.55.55.55").
+			Expect().
+			Status(http.StatusOK)
+	})
+})