318 lines
10 KiB
Go
318 lines
10 KiB
Go
package crd
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import (
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"context"
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"crypto/sha256"
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"fmt"
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"os"
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"reflect"
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"sort"
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"strconv"
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"strings"
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"time"
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"github.com/cenkalti/backoff/v3"
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"github.com/containous/traefik/v2/pkg/config/dynamic"
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"github.com/containous/traefik/v2/pkg/job"
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"github.com/containous/traefik/v2/pkg/log"
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"github.com/containous/traefik/v2/pkg/safe"
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"github.com/containous/traefik/v2/pkg/tls"
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corev1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/labels"
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)
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const (
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annotationKubernetesIngressClass = "kubernetes.io/ingress.class"
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traefikDefaultIngressClass = "traefik"
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)
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// Provider holds configurations of the provider.
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type Provider struct {
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Endpoint string `description:"Kubernetes server endpoint (required for external cluster client)." json:"endpoint,omitempty" toml:"endpoint,omitempty" yaml:"endpoint,omitempty"`
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Token string `description:"Kubernetes bearer token (not needed for in-cluster client)." json:"token,omitempty" toml:"token,omitempty" yaml:"token,omitempty"`
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CertAuthFilePath string `description:"Kubernetes certificate authority file path (not needed for in-cluster client)." json:"certAuthFilePath,omitempty" toml:"certAuthFilePath,omitempty" yaml:"certAuthFilePath,omitempty"`
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DisablePassHostHeaders bool `description:"Kubernetes disable PassHost Headers." json:"disablePassHostHeaders,omitempty" toml:"disablePassHostHeaders,omitempty" yaml:"disablePassHostHeaders,omitempty" export:"true"`
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Namespaces []string `description:"Kubernetes namespaces." json:"namespaces,omitempty" toml:"namespaces,omitempty" yaml:"namespaces,omitempty" export:"true"`
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LabelSelector string `description:"Kubernetes label selector to use." json:"labelSelector,omitempty" toml:"labelSelector,omitempty" yaml:"labelSelector,omitempty" export:"true"`
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IngressClass string `description:"Value of kubernetes.io/ingress.class annotation to watch for." json:"ingressClass,omitempty" toml:"ingressClass,omitempty" yaml:"ingressClass,omitempty" export:"true"`
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lastConfiguration safe.Safe
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}
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func (p *Provider) newK8sClient(ctx context.Context, labelSelector string) (*clientWrapper, error) {
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labelSel, err := labels.Parse(labelSelector)
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if err != nil {
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return nil, fmt.Errorf("invalid label selector: %q", labelSelector)
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}
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log.FromContext(ctx).Infof("label selector is: %q", labelSel)
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withEndpoint := ""
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if p.Endpoint != "" {
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withEndpoint = fmt.Sprintf(" with endpoint %v", p.Endpoint)
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}
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var client *clientWrapper
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switch {
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case os.Getenv("KUBERNETES_SERVICE_HOST") != "" && os.Getenv("KUBERNETES_SERVICE_PORT") != "":
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log.FromContext(ctx).Infof("Creating in-cluster Provider client%s", withEndpoint)
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client, err = newInClusterClient(p.Endpoint)
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case os.Getenv("KUBECONFIG") != "":
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log.FromContext(ctx).Infof("Creating cluster-external Provider client from KUBECONFIG %s", os.Getenv("KUBECONFIG"))
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client, err = newExternalClusterClientFromFile(os.Getenv("KUBECONFIG"))
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default:
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log.FromContext(ctx).Infof("Creating cluster-external Provider client%s", withEndpoint)
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client, err = newExternalClusterClient(p.Endpoint, p.Token, p.CertAuthFilePath)
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}
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if err == nil {
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client.labelSelector = labelSel
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}
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return client, err
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}
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// Init the provider.
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func (p *Provider) Init() error {
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return nil
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}
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// Provide allows the k8s provider to provide configurations to traefik
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// using the given configuration channel.
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func (p *Provider) Provide(configurationChan chan<- dynamic.Message, pool *safe.Pool) error {
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ctxLog := log.With(context.Background(), log.Str(log.ProviderName, "kubernetescrd"))
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logger := log.FromContext(ctxLog)
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logger.Debugf("Using label selector: %q", p.LabelSelector)
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k8sClient, err := p.newK8sClient(ctxLog, p.LabelSelector)
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if err != nil {
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return err
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}
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pool.Go(func(stop chan bool) {
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operation := func() error {
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stopWatch := make(chan struct{}, 1)
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defer close(stopWatch)
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eventsChan, err := k8sClient.WatchAll(p.Namespaces, stopWatch)
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if err != nil {
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logger.Errorf("Error watching kubernetes events: %v", err)
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timer := time.NewTimer(1 * time.Second)
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select {
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case <-timer.C:
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return err
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case <-stop:
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return nil
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}
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}
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for {
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select {
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case <-stop:
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return nil
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case event := <-eventsChan:
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conf := p.loadConfigurationFromCRD(ctxLog, k8sClient)
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if reflect.DeepEqual(p.lastConfiguration.Get(), conf) {
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logger.Debugf("Skipping Kubernetes event kind %T", event)
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} else {
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p.lastConfiguration.Set(conf)
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configurationChan <- dynamic.Message{
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ProviderName: "kubernetescrd",
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Configuration: conf,
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}
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}
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}
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}
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}
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notify := func(err error, time time.Duration) {
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logger.Errorf("Provider connection error: %s; retrying in %s", err, time)
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}
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err := backoff.RetryNotify(safe.OperationWithRecover(operation), job.NewBackOff(backoff.NewExponentialBackOff()), notify)
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if err != nil {
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logger.Errorf("Cannot connect to Provider: %s", err)
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}
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})
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return nil
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}
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func (p *Provider) loadConfigurationFromCRD(ctx context.Context, client Client) *dynamic.Configuration {
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tlsConfigs := make(map[string]*tls.CertAndStores)
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conf := &dynamic.Configuration{
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HTTP: p.loadIngressRouteConfiguration(ctx, client, tlsConfigs),
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TCP: p.loadIngressRouteTCPConfiguration(ctx, client, tlsConfigs),
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TLS: &dynamic.TLSConfiguration{
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Certificates: getTLSConfig(tlsConfigs),
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Options: buildTLSOptions(ctx, client),
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},
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}
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for _, middleware := range client.GetMiddlewares() {
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conf.HTTP.Middlewares[makeID(middleware.Namespace, middleware.Name)] = &middleware.Spec
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}
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return conf
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}
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func buildTLSOptions(ctx context.Context, client Client) map[string]tls.Options {
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tlsOptionsCRD := client.GetTLSOptions()
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var tlsOptions map[string]tls.Options
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if len(tlsOptionsCRD) == 0 {
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return tlsOptions
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}
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tlsOptions = make(map[string]tls.Options)
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for _, tlsOption := range tlsOptionsCRD {
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logger := log.FromContext(log.With(ctx, log.Str("tlsOption", tlsOption.Name), log.Str("namespace", tlsOption.Namespace)))
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var clientCAs []tls.FileOrContent
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for _, secretName := range tlsOption.Spec.ClientAuth.SecretNames {
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secret, exists, err := client.GetSecret(tlsOption.Namespace, secretName)
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if err != nil {
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logger.Errorf("Failed to fetch secret %s/%s: %v", tlsOption.Namespace, secretName, err)
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continue
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}
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if !exists {
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logger.Warnf("Secret %s/%s does not exist", tlsOption.Namespace, secretName)
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continue
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}
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cert, err := getCABlocks(secret, tlsOption.Namespace, secretName)
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if err != nil {
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logger.Errorf("Failed to extract CA from secret %s/%s: %v", tlsOption.Namespace, secretName, err)
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continue
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}
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clientCAs = append(clientCAs, tls.FileOrContent(cert))
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}
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tlsOptions[makeID(tlsOption.Namespace, tlsOption.Name)] = tls.Options{
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MinVersion: tlsOption.Spec.MinVersion,
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CipherSuites: tlsOption.Spec.CipherSuites,
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ClientAuth: tls.ClientAuth{
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CAFiles: clientCAs,
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ClientAuthType: tlsOption.Spec.ClientAuth.ClientAuthType,
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},
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SniStrict: tlsOption.Spec.SniStrict,
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}
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}
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return tlsOptions
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}
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func checkStringQuoteValidity(value string) error {
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_, err := strconv.Unquote(`"` + value + `"`)
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return err
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}
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func makeServiceKey(rule, ingressName string) (string, error) {
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h := sha256.New()
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if _, err := h.Write([]byte(rule)); err != nil {
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return "", err
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}
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key := fmt.Sprintf("%s-%.10x", ingressName, h.Sum(nil))
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return key, nil
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}
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func makeID(namespace, name string) string {
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if namespace == "" {
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return name
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}
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return namespace + "/" + name
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}
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func shouldProcessIngress(ingressClass string, ingressClassAnnotation string) bool {
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return ingressClass == ingressClassAnnotation ||
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(len(ingressClass) == 0 && ingressClassAnnotation == traefikDefaultIngressClass)
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}
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func getTLS(k8sClient Client, secretName, namespace string) (*tls.CertAndStores, error) {
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secret, exists, err := k8sClient.GetSecret(namespace, secretName)
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if err != nil {
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return nil, fmt.Errorf("failed to fetch secret %s/%s: %v", namespace, secretName, err)
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}
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if !exists {
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return nil, fmt.Errorf("secret %s/%s does not exist", namespace, secretName)
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}
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cert, key, err := getCertificateBlocks(secret, namespace, secretName)
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if err != nil {
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return nil, err
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}
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return &tls.CertAndStores{
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Certificate: tls.Certificate{
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CertFile: tls.FileOrContent(cert),
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KeyFile: tls.FileOrContent(key),
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},
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}, nil
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}
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func getTLSConfig(tlsConfigs map[string]*tls.CertAndStores) []*tls.CertAndStores {
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var secretNames []string
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for secretName := range tlsConfigs {
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secretNames = append(secretNames, secretName)
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}
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sort.Strings(secretNames)
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var configs []*tls.CertAndStores
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for _, secretName := range secretNames {
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configs = append(configs, tlsConfigs[secretName])
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}
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return configs
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}
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func getCertificateBlocks(secret *corev1.Secret, namespace, secretName string) (string, string, error) {
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var missingEntries []string
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tlsCrtData, tlsCrtExists := secret.Data["tls.crt"]
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if !tlsCrtExists {
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missingEntries = append(missingEntries, "tls.crt")
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}
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tlsKeyData, tlsKeyExists := secret.Data["tls.key"]
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if !tlsKeyExists {
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missingEntries = append(missingEntries, "tls.key")
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}
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if len(missingEntries) > 0 {
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return "", "", fmt.Errorf("secret %s/%s is missing the following TLS data entries: %s",
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namespace, secretName, strings.Join(missingEntries, ", "))
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}
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cert := string(tlsCrtData)
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if cert == "" {
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missingEntries = append(missingEntries, "tls.crt")
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}
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key := string(tlsKeyData)
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if key == "" {
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missingEntries = append(missingEntries, "tls.key")
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}
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if len(missingEntries) > 0 {
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return "", "", fmt.Errorf("secret %s/%s contains the following empty TLS data entries: %s",
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namespace, secretName, strings.Join(missingEntries, ", "))
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}
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return cert, key, nil
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}
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func getCABlocks(secret *corev1.Secret, namespace, secretName string) (string, error) {
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tlsCrtData, tlsCrtExists := secret.Data["tls.ca"]
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if !tlsCrtExists {
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return "", fmt.Errorf("the tls.ca entry is missing from secret %s/%s",
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namespace, secretName)
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}
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cert := string(tlsCrtData)
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if cert == "" {
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return "", fmt.Errorf("the tls.ca entry in secret %s/%s is empty",
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namespace, secretName)
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}
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return cert, nil
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}
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