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Enable karydia-default-network-policy for enhanced security (#164)
Level 1 Network Policy / karydia-default-network-policy added security for the following aspects: - block access to host network (AWS only) - block access to meta data services (AWS, GCP, Azure and Alibaba Cloud)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| // Copyright (C) 2019 SAP SE or an SAP affiliate company. All rights reserved. | ||
| // This file is licensed under the Apache Software License, v. 2 except as | ||
| // noted otherwise in the LICENSE file. | ||
| // | ||
| // 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 e2e | ||
|
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||
| import ( | ||
| "os/exec" | ||
| "strings" | ||
| "syscall" | ||
| "testing" | ||
| "time" | ||
|
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| corev1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| ) | ||
|
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||
| const ( | ||
| Success int = 0 | ||
| TimeOut int = 1 | ||
| ) | ||
|
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| func execCommandAssertExitCode(t *testing.T, command string, expectedExitCode int) { | ||
| exitCode := Success | ||
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| args := strings.Fields(command) | ||
| cmd := exec.Command(args[0], args[1:]...) | ||
| err := cmd.Run() | ||
|
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| if err != nil { | ||
| // try to get the exit code | ||
| if exitError, ok := err.(*exec.ExitError); ok { | ||
| ws := exitError.Sys().(syscall.WaitStatus) | ||
| exitCode = ws.ExitStatus() | ||
|
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||
| if exitCode != expectedExitCode { | ||
| t.Fatalf("Exit status with unexpected code: %d %s", exitCode, command) | ||
| } | ||
| } else { | ||
| t.Fatalf("Could not get exit code.") | ||
| } | ||
| } else { | ||
| // success, exitCode should be 0 if go is ok | ||
| ws := cmd.ProcessState.Sys().(syscall.WaitStatus) | ||
| exitCode = ws.ExitStatus() | ||
|
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| if exitCode != expectedExitCode { | ||
| t.Fatalf("Exit status with unexpected code: %d %s", exitCode, command) | ||
| } | ||
| } | ||
| } | ||
|
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| func TestNetworkPolicyLevel1(t *testing.T) { | ||
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| var namespace *corev1.Namespace | ||
| var err error | ||
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| namespace, err = f.CreateTestNamespace() | ||
| if err != nil { | ||
| t.Fatalf("failed to create test namespace: %v", err) | ||
| } | ||
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| ns := namespace.ObjectMeta.Name | ||
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| pod := &corev1.Pod{ | ||
| ObjectMeta: metav1.ObjectMeta{ | ||
| Name: "karydia-network-policy-1", | ||
| Namespace: ns, | ||
| }, | ||
| Spec: corev1.PodSpec{ | ||
| Containers: []corev1.Container{ | ||
| { | ||
| Name: "karydia-e2e-test-container", | ||
| Image: "alpine", | ||
| Command: []string{"tail", "-f", "/dev/null"}, | ||
| }, | ||
| }, | ||
| }, | ||
| } | ||
|
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| createdPod, err := f.KubeClientset.CoreV1().Pods(ns).Create(pod) | ||
| if err != nil { | ||
| t.Fatalf("Failed to create: " + err.Error()) | ||
| } | ||
| podName := createdPod.ObjectMeta.Name | ||
|
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| timeout := 2 * time.Minute | ||
| if err := f.WaitPodRunning(ns, podName, timeout); err != nil { | ||
| t.Fatalf("pod never reached state running") | ||
| } | ||
|
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| // host network (AWS only) | ||
| cmd1 := "kubectl exec --namespace=" + ns + " " + podName + " -- wget --spider --timeout 3 10.250.0.0" | ||
| execCommandAssertExitCode(t, cmd1, TimeOut) | ||
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| cmd2 := "kubectl exec --namespace=" + ns + " " + podName + " -- wget --spider --timeout 3 10.250.1.1" | ||
| execCommandAssertExitCode(t, cmd2, TimeOut) | ||
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| cmd3 := "kubectl exec --namespace=" + ns + " " + podName + " -- wget --spider --timeout 3 10.250.50.200" | ||
| execCommandAssertExitCode(t, cmd3, TimeOut) | ||
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| // meta data services (AWS, GCP, Azure) | ||
| cmd4 := "kubectl exec --namespace=" + ns + " " + podName + " -- wget --spider --timeout 3 169.254.169.254" | ||
| execCommandAssertExitCode(t, cmd4, TimeOut) | ||
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| cmd5 := "kubectl exec --namespace=" + ns + " " + podName + " -- wget --spider --timeout 3 169.254.0.0" | ||
| execCommandAssertExitCode(t, cmd5, TimeOut) | ||
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| cmd6 := "kubectl exec --namespace=" + ns + " " + podName + " -- wget --spider --timeout 3 169.254.2.2" | ||
| execCommandAssertExitCode(t, cmd6, TimeOut) | ||
|
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| // meta data services (Alibaba Cloud) | ||
| cmd7 := "kubectl exec --namespace=" + ns + " " + podName + " -- wget --spider --timeout 3 100.100.0.0" | ||
| execCommandAssertExitCode(t, cmd7, TimeOut) | ||
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| cmd8 := "kubectl exec --namespace=" + ns + " " + podName + " -- wget --spider --timeout 3 100.100.1.3" | ||
| execCommandAssertExitCode(t, cmd8, TimeOut) | ||
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| cmd9 := "kubectl exec --namespace=" + ns + " " + podName + " -- wget --spider --timeout 3 100.100.60.155" | ||
| execCommandAssertExitCode(t, cmd9, TimeOut) | ||
|
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| // external traffic with static IPs | ||
| // Google DNS | ||
| cmd10 := "kubectl exec --namespace=" + ns + " " + podName + " -- wget --spider --timeout 3 https://8.8.8.8" | ||
| execCommandAssertExitCode(t, cmd10, Success) | ||
|
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| // Cloudflare DNS | ||
| cmd11 := "kubectl exec --namespace=" + ns + " " + podName + " -- wget --spider --timeout 3 1.1.1.1" | ||
| execCommandAssertExitCode(t, cmd11, Success) | ||
|
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| // external traffic with domain names | ||
| cmd12 := "kubectl exec --namespace=" + ns + " " + podName + " -- wget --spider --timeout 3 www.google.de" | ||
| execCommandAssertExitCode(t, cmd12, Success) | ||
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| cmd13 := "kubectl exec --namespace=" + ns + " " + podName + " -- wget --spider --timeout 3 www.sap.com" | ||
| execCommandAssertExitCode(t, cmd13, Success) | ||
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| err = f.KubeClientset.CoreV1().Pods(ns).Delete(createdPod.ObjectMeta.Name, &metav1.DeleteOptions{}) | ||
| if err != nil { | ||
| t.Fatalf("pod could not be deleted") | ||
| } | ||
|
|
||
| } |