k8s: Validate API server not excluded admission plugins

This patch verifies if CIS Kubernetes Benchmark v1.3.0 section
regarding master node configuration is satisfied (1.1.14).

Issue-ID: SECCOM-235
Change-Id: I63c2f8a5b94bfd6c9963805aae85595e6b6ad6d7
Signed-off-by: Pawel Wieczorek <p.wieczorek2@samsung.com>

2 files changed, 18 insertions, 0 deletions

diff --git a/test/security/k8s/src/check/validators/master/api.go b/test/security/k8s/src/check/validators/master/api.go
index 0bed71189..dc22e35f6 100644
--- a/test/security/k8s/src/check/validators/master/api.go
+++ b/test/security/k8s/src/check/validators/master/api.go
@@ -215,6 +215,14 @@ func IsEventRateLimitAdmissionControlPluginIncluded(params []string) bool {
 	return false
 }
 
+// IsNamespaceLifecycleAdmissionControlPluginNotExcluded validates NamespaceLifecycle is excluded from admission control plugins.
+func IsNamespaceLifecycleAdmissionControlPluginNotExcluded(params []string) bool {
+	if isSingleFlagPresent("--disable-admission-plugins=", params) {
+		return !hasFlagArgumentIncluded("--disable-admission-plugins=", "NamespaceLifecycle", params)
+	}
+	return true
+}
+
 // isSingleFlagPresent checks presence of selected flag and whether it was used once.
 func isSingleFlagPresent(flag string, params []string) bool {
 	found := filterFlags(params, flag)
diff --git a/test/security/k8s/src/check/validators/master/api_test.go b/test/security/k8s/src/check/validators/master/api_test.go
index 4e125663a..233662a63 100644
--- a/test/security/k8s/src/check/validators/master/api_test.go
+++ b/test/security/k8s/src/check/validators/master/api_test.go
@@ -305,5 +305,15 @@ var _ = Describe("Api", func() {
 			Entry("Is not present on Dublin cluster", kubeApiServerDublin, false),
 			Entry("Should be present on CIS-compliant cluster", kubeApiServerCISCompliant, true),
 		)
+
+		DescribeTable("NamespaceLifecycle admission control plugin",
+			func(params []string, expected bool) {
+				Expect(IsNamespaceLifecycleAdmissionControlPluginNotExcluded(params)).To(Equal(expected))
+			},
+			Entry("Is explicitly disabled on insecure cluster", []string{"--disable-admission-plugins=Foo,Bar,NamespaceLifecycle,Baz,Quuz"}, false),
+			Entry("Should not be disabled on CIS-compliant cluster", kubeApiServerCISCompliant, true),
+			Entry("Should not be disabled on Casablanca cluster", kubeApiServerCasablanca, true),
+			Entry("Should not be disabled on Dublin cluster", kubeApiServerDublin, true),
+		)
 	})
 })