e1bf54d0e3
Add a --tls-cipher-suites command line flag and set to sensible defaults. Signed-off-by: Will Thames <will@thames.id.au>
129 lines
4.0 KiB
Go
129 lines
4.0 KiB
Go
/*
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Copyright 2019 The Jetstack cert-manager contributors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"flag"
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"fmt"
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"os"
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"os/signal"
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"strings"
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"syscall"
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"k8s.io/klog"
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"k8s.io/klog/klogr"
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"github.com/jetstack/cert-manager/pkg/logs"
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"github.com/jetstack/cert-manager/pkg/webhook"
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"github.com/jetstack/cert-manager/pkg/webhook/handlers"
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"github.com/jetstack/cert-manager/pkg/webhook/server"
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)
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const (
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defaultCipherSuites = "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256," +
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"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384," +
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"TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305," +
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"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA," +
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"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA," +
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"TLS_RSA_WITH_AES_128_GCM_SHA256," +
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"TLS_RSA_WITH_AES_256_GCM_SHA384," +
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"TLS_RSA_WITH_AES_128_CBC_SHA," +
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"TLS_RSA_WITH_AES_256_CBC_SHA"
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)
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var (
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securePort int
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healthzPort int
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tlsCertFile string
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tlsKeyFile string
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tlsCipherSuites string
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)
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func init() {
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flag.IntVar(&healthzPort, "healthz-port", 6080, "port number to listen on for insecure healthz connections")
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flag.IntVar(&securePort, "secure-port", 6443, "port number to listen on for secure TLS connections")
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flag.StringVar(&tlsCertFile, "tls-cert-file", "", "path to the file containing the TLS certificate to serve with")
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flag.StringVar(&tlsKeyFile, "tls-private-key-file", "", "path to the file containing the TLS private key to serve with")
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flag.StringVar(&tlsCipherSuites, "tls-cipher-suites", defaultCipherSuites, "comma separated list of TLS 1.2 cipher suites to use (TLS 1.3 cipher suites are not configurable)")
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}
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var validationHook handlers.ValidatingAdmissionHook = handlers.NewRegistryBackedValidator(logs.Log, webhook.Scheme, webhook.ValidationRegistry)
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var mutationHook handlers.MutatingAdmissionHook = handlers.NewSchemeBackedDefaulter(logs.Log, webhook.Scheme)
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var conversionHook handlers.ConversionHook = handlers.NewSchemeBackedConverter(logs.Log, webhook.Scheme)
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func main() {
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klog.InitFlags(flag.CommandLine)
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flag.Parse()
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log := klogr.New()
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stopCh := setupSignalHandler()
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var source server.CertificateSource
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if tlsCertFile == "" || tlsKeyFile == "" {
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log.Info("warning: serving insecurely as tls certificate data not provided")
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} else {
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log.Info("enabling TLS as certificate file flags specified")
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source = &server.FileCertificateSource{
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CertPath: tlsCertFile,
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KeyPath: tlsKeyFile,
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Log: log,
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}
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}
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var cipherSuites []string
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if len(tlsCipherSuites) > 0 {
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cipherSuites = strings.Split(tlsCipherSuites, ",")
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}
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srv := server.Server{
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ListenAddr: fmt.Sprintf(":%d", securePort),
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HealthzAddr: fmt.Sprintf(":%d", healthzPort),
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EnablePprof: true,
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CertificateSource: source,
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CipherSuites: cipherSuites,
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ValidationWebhook: validationHook,
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MutationWebhook: mutationHook,
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ConversionWebhook: conversionHook,
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Log: log,
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}
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if err := srv.Run(stopCh); err != nil {
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log.Error(err, "error running server")
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os.Exit(1)
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}
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}
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var shutdownSignals = []os.Signal{os.Interrupt, syscall.SIGTERM}
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var onlyOneSignalHandler = make(chan struct{})
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// setupSignalHandler registered for SIGTERM and SIGINT. A stop channel is returned
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// which is closed on one of these signals. If a second signal is caught, the program
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// is terminated with exit code 1.
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func setupSignalHandler() (stopCh <-chan struct{}) {
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close(onlyOneSignalHandler) // panics when called twice
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stop := make(chan struct{})
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c := make(chan os.Signal, 2)
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signal.Notify(c, shutdownSignals...)
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go func() {
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<-c
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close(stop)
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<-c
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os.Exit(1) // second signal. Exit directly.
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}()
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return stop
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}
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