main_test.go

/*
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 main

import (
	"bytes"
	"crypto/tls"
	"testing"

	. "github.com/onsi/gomega" //nolint:revive
	"k8s.io/klog/v2"
	ctrl "sigs.k8s.io/controller-runtime"
)

func TestTLSInsecureCiperSuite(t *testing.T) {
	t.Run("test insecure cipher suite passed as TLS flag", func(t *testing.T) {
		g := NewWithT(t)
		tlsMockOptions := TLSOptions{
			TLSMaxVersion:   "TLS13",
			TLSMinVersion:   "TLS12",
			TLSCipherSuites: "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256",
		}
		ctrl.Log.WithName("setup")
		ctrl.SetLogger(klog.Background())

		bufWriter := bytes.NewBuffer(nil)
		klog.SetOutput(bufWriter)
		klog.LogToStderr(false) // this is important, because klog by default logs to stderr only
		_, err := GetTLSOptionOverrideFuncs(tlsMockOptions)
		g.Expect(err).Should(BeNil())
		g.Expect(bufWriter.String()).Should(ContainSubstring("use of insecure cipher 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256' detected."))
	})
}

func TestTLSMinAndMaxVersion(t *testing.T) {
	t.Run("should fail if TLS min version is greater than max version.", func(t *testing.T) {
		g := NewWithT(t)
		tlsMockOptions := TLSOptions{
			TLSMaxVersion: "TLS12",
			TLSMinVersion: "TLS13",
		}
		_, err := GetTLSOptionOverrideFuncs(tlsMockOptions)
		g.Expect(err.Error()).To(Equal("TLS version flag min version (TLS13) is greater than max version (TLS12)"))
	})
}

func Test13CipherSuite(t *testing.T) {
	t.Run("should reset ciphersuite flag if TLS min and max version are set to 1.3", func(t *testing.T) {
		g := NewWithT(t)

		// Here TLS_RSA_WITH_AES_128_CBC_SHA is a tls12 cipher suite.
		tlsMockOptions := TLSOptions{
			TLSMaxVersion:   "TLS13",
			TLSMinVersion:   "TLS13",
			TLSCipherSuites: "TLS_RSA_WITH_AES_128_CBC_SHA,TLS_AES_256_GCM_SHA384",
		}

		ctrl.Log.WithName("setup")
		ctrl.SetLogger(klog.Background())

		bufWriter := bytes.NewBuffer(nil)
		klog.SetOutput(bufWriter)
		klog.LogToStderr(false) // this is important, because klog by default logs to stderr only
		_, err := GetTLSOptionOverrideFuncs(tlsMockOptions)
		g.Expect(err).Should(BeNil())
		g.Expect(bufWriter.String()).Should(ContainSubstring("warning: Cipher suites should not be set for TLS version 1.3. Ignoring ciphers"))
	})
}

func TestGetTLSOverrideFuncs(t *testing.T) {
	t.Run("should error out when incorrect min tls version passed", func(t *testing.T) {
		g := NewWithT(t)
		_, err := GetTLSOptionOverrideFuncs(TLSOptions{
			TLSMinVersion: "TLS11",
			TLSMaxVersion: "TLS12",
		})
		g.Expect(err.Error()).Should(Equal("unexpected TLS version \"TLS11\" (must be one of: TLS12, TLS13)"))
	})
	t.Run("should error out when incorrect max tls version passed", func(t *testing.T) {
		g := NewWithT(t)
		_, err := GetTLSOptionOverrideFuncs(TLSOptions{
			TLSMinVersion: "TLS12",
			TLSMaxVersion: "TLS11",
		})
		g.Expect(err.Error()).Should(Equal("unexpected TLS version \"TLS11\" (must be one of: TLS12, TLS13)"))
	})
	t.Run("should apply the requested TLS versions", func(t *testing.T) {
		g := NewWithT(t)
		tlsOptionOverrides, err := GetTLSOptionOverrideFuncs(TLSOptions{
			TLSMinVersion: "TLS12",
			TLSMaxVersion: "TLS13",
		})

		var tlsConfig tls.Config
		for _, apply := range tlsOptionOverrides {
			apply(&tlsConfig)
		}

		g.Expect(err).Should(BeNil())
		g.Expect(tlsConfig.MinVersion).To(Equal(uint16(tls.VersionTLS12)))
		g.Expect(tlsConfig.MaxVersion).To(Equal(uint16(tls.VersionTLS13)))
	})
	t.Run("should apply the requested non-default TLS versions", func(t *testing.T) {
		g := NewWithT(t)
		tlsOptionOverrides, err := GetTLSOptionOverrideFuncs(TLSOptions{
			TLSMinVersion: "TLS13",
			TLSMaxVersion: "TLS13",
		})

		var tlsConfig tls.Config
		for _, apply := range tlsOptionOverrides {
			apply(&tlsConfig)
		}

		g.Expect(err).Should(BeNil())
		g.Expect(tlsConfig.MinVersion).To(Equal(uint16(tls.VersionTLS13)))
		g.Expect(tlsConfig.MaxVersion).To(Equal(uint16(tls.VersionTLS13)))
	})
}

func TestTLSOptions(t *testing.T) {
	t.Run("should pass with all the correct options below with no error.", func(t *testing.T) {
		g := NewWithT(t)
		tlsMockOptions := TLSOptions{
			TLSMinVersion:   "TLS12",
			TLSMaxVersion:   "TLS13",
			TLSCipherSuites: "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
		}
		_, err := GetTLSOptionOverrideFuncs(tlsMockOptions)
		g.Expect(err).Should(BeNil())
	})
}