494 lines
18 KiB
Go
494 lines
18 KiB
Go
package kubernetes
|
|
|
|
import (
|
|
"bufio"
|
|
"bytes"
|
|
"errors"
|
|
"flag"
|
|
"fmt"
|
|
"os"
|
|
"reflect"
|
|
"strconv"
|
|
"strings"
|
|
"text/template"
|
|
"time"
|
|
|
|
"github.com/cenk/backoff"
|
|
"github.com/containous/traefik/job"
|
|
"github.com/containous/traefik/log"
|
|
"github.com/containous/traefik/provider"
|
|
"github.com/containous/traefik/safe"
|
|
"github.com/containous/traefik/types"
|
|
"k8s.io/client-go/pkg/api/v1"
|
|
"k8s.io/client-go/pkg/apis/extensions/v1beta1"
|
|
"k8s.io/client-go/pkg/util/intstr"
|
|
)
|
|
|
|
var _ provider.Provider = (*Provider)(nil)
|
|
|
|
const (
|
|
ruleTypePathPrefix = "PathPrefix"
|
|
ruleTypeReplacePath = "ReplacePath"
|
|
|
|
annotationKubernetesIngressClass = "kubernetes.io/ingress.class"
|
|
annotationKubernetesAuthRealm = "ingress.kubernetes.io/auth-realm"
|
|
annotationKubernetesAuthType = "ingress.kubernetes.io/auth-type"
|
|
annotationKubernetesAuthSecret = "ingress.kubernetes.io/auth-secret"
|
|
annotationKubernetesRewriteTarget = "ingress.kubernetes.io/rewrite-target"
|
|
annotationKubernetesWhitelistSourceRange = "ingress.kubernetes.io/whitelist-source-range"
|
|
annotationKubernetesSSLRedirect = "ingress.kubernetes.io/ssl-redirect"
|
|
annotationKubernetesHSTSMaxAge = "ingress.kubernetes.io/hsts-max-age"
|
|
annotationKubernetesHSTSIncludeSubdomains = "ingress.kubernetes.io/hsts-include-subdomains"
|
|
annotationKubernetesCustomRequestHeaders = "ingress.kubernetes.io/custom-request-headers"
|
|
annotationKubernetesCustomResponseHeaders = "ingress.kubernetes.io/custom-response-headers"
|
|
annotationKubernetesAllowedHosts = "ingress.kubernetes.io/allowed-hosts"
|
|
annotationKubernetesProxyHeaders = "ingress.kubernetes.io/proxy-headers"
|
|
annotationKubernetesSSLTemporaryRedirect = "ingress.kubernetes.io/ssl-temporary-redirect"
|
|
annotationKubernetesSSLHost = "ingress.kubernetes.io/ssl-host"
|
|
annotationKubernetesSSLProxyHeaders = "ingress.kubernetes.io/ssl-proxy-headers"
|
|
annotationKubernetesHSTSPreload = "ingress.kubernetes.io/hsts-preload"
|
|
annotationKubernetesForceHSTSHeader = "ingress.kubernetes.io/force-hsts"
|
|
annotationKubernetesFrameDeny = "ingress.kubernetes.io/frame-deny"
|
|
annotationKubernetesCustomFrameOptionsValue = "ingress.kubernetes.io/custom-frame-options-value"
|
|
annotationKubernetesContentTypeNosniff = "ingress.kubernetes.io/content-type-nosniff"
|
|
annotationKubernetesBrowserXSSFilter = "ingress.kubernetes.io/browser-xss-filter"
|
|
annotationKubernetesContentSecurityPolicy = "ingress.kubernetes.io/content-security-policy"
|
|
annotationKubernetesPublicKey = "ingress.kubernetes.io/public-key"
|
|
annotationKubernetesReferrerPolicy = "ingress.kubernetes.io/referrer-policy"
|
|
annotationKubernetesIsDevelopment = "ingress.kubernetes.io/is-development"
|
|
)
|
|
|
|
const traefikDefaultRealm = "traefik"
|
|
|
|
// Provider holds configurations of the provider.
|
|
type Provider struct {
|
|
provider.BaseProvider `mapstructure:",squash" export:"true"`
|
|
Endpoint string `description:"Kubernetes server endpoint (required for external cluster client)"`
|
|
Token string `description:"Kubernetes bearer token (not needed for in-cluster client)"`
|
|
CertAuthFilePath string `description:"Kubernetes certificate authority file path (not needed for in-cluster client)"`
|
|
DisablePassHostHeaders bool `description:"Kubernetes disable PassHost Headers" export:"true"`
|
|
EnablePassTLSCert bool `description:"Kubernetes enable Pass TLS Client Certs" export:"true"`
|
|
Namespaces Namespaces `description:"Kubernetes namespaces" export:"true"`
|
|
LabelSelector string `description:"Kubernetes api label selector to use" export:"true"`
|
|
lastConfiguration safe.Safe
|
|
}
|
|
|
|
func (p Provider) newK8sClient() (Client, error) {
|
|
withEndpoint := ""
|
|
if p.Endpoint != "" {
|
|
withEndpoint = fmt.Sprintf(" with endpoint %v", p.Endpoint)
|
|
}
|
|
|
|
if os.Getenv("KUBERNETES_SERVICE_HOST") != "" && os.Getenv("KUBERNETES_SERVICE_PORT") != "" {
|
|
log.Infof("Creating in-cluster Provider client%s\n", withEndpoint)
|
|
return NewInClusterClient(p.Endpoint)
|
|
}
|
|
|
|
log.Infof("Creating cluster-external Provider client%s\n", withEndpoint)
|
|
return NewExternalClusterClient(p.Endpoint, p.Token, p.CertAuthFilePath)
|
|
}
|
|
|
|
// Provide allows the k8s provider to provide configurations to traefik
|
|
// using the given configuration channel.
|
|
func (p *Provider) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, constraints types.Constraints) error {
|
|
// Tell glog (used by client-go) to log into STDERR. Otherwise, we risk
|
|
// certain kinds of API errors getting logged into a directory not
|
|
// available in a `FROM scratch` Docker container, causing glog to abort
|
|
// hard with an exit code > 0.
|
|
flag.Set("logtostderr", "true")
|
|
|
|
k8sClient, err := p.newK8sClient()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
p.Constraints = append(p.Constraints, constraints...)
|
|
|
|
pool.Go(func(stop chan bool) {
|
|
operation := func() error {
|
|
for {
|
|
stopWatch := make(chan struct{}, 1)
|
|
defer close(stopWatch)
|
|
log.Debugf("Using label selector: '%s'", p.LabelSelector)
|
|
eventsChan, err := k8sClient.WatchAll(p.Namespaces, p.LabelSelector, stopWatch)
|
|
if err != nil {
|
|
log.Errorf("Error watching kubernetes events: %v", err)
|
|
timer := time.NewTimer(1 * time.Second)
|
|
select {
|
|
case <-timer.C:
|
|
return err
|
|
case <-stop:
|
|
return nil
|
|
}
|
|
}
|
|
for {
|
|
select {
|
|
case <-stop:
|
|
return nil
|
|
case event := <-eventsChan:
|
|
log.Debugf("Received Kubernetes event kind %T", event)
|
|
templateObjects, err := p.loadIngresses(k8sClient)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if reflect.DeepEqual(p.lastConfiguration.Get(), templateObjects) {
|
|
log.Debugf("Skipping Kubernetes event kind %T", event)
|
|
} else {
|
|
p.lastConfiguration.Set(templateObjects)
|
|
configurationChan <- types.ConfigMessage{
|
|
ProviderName: "kubernetes",
|
|
Configuration: p.loadConfig(*templateObjects),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
notify := func(err error, time time.Duration) {
|
|
log.Errorf("Provider connection error: %s; retrying in %s", err, time)
|
|
}
|
|
err := backoff.RetryNotify(safe.OperationWithRecover(operation), job.NewBackOff(backoff.NewExponentialBackOff()), notify)
|
|
if err != nil {
|
|
log.Errorf("Cannot connect to Provider: %s", err)
|
|
}
|
|
})
|
|
|
|
return nil
|
|
}
|
|
|
|
func (p *Provider) loadIngresses(k8sClient Client) (*types.Configuration, error) {
|
|
ingresses := k8sClient.GetIngresses()
|
|
|
|
templateObjects := types.Configuration{
|
|
Backends: map[string]*types.Backend{},
|
|
Frontends: map[string]*types.Frontend{},
|
|
}
|
|
for _, i := range ingresses {
|
|
ingressClass := i.Annotations[annotationKubernetesIngressClass]
|
|
|
|
if !shouldProcessIngress(ingressClass) {
|
|
continue
|
|
}
|
|
|
|
for _, r := range i.Spec.Rules {
|
|
if r.HTTP == nil {
|
|
log.Warn("Error in ingress: HTTP is nil")
|
|
continue
|
|
}
|
|
|
|
for _, pa := range r.HTTP.Paths {
|
|
if _, exists := templateObjects.Backends[r.Host+pa.Path]; !exists {
|
|
templateObjects.Backends[r.Host+pa.Path] = &types.Backend{
|
|
Servers: make(map[string]types.Server),
|
|
LoadBalancer: &types.LoadBalancer{
|
|
Method: "wrr",
|
|
},
|
|
}
|
|
}
|
|
|
|
passHostHeader := getBoolAnnotation(i, types.LabelFrontendPassHostHeader, !p.DisablePassHostHeaders)
|
|
passTLSCert := getBoolAnnotation(i, types.LabelFrontendPassTLSCert, p.EnablePassTLSCert)
|
|
|
|
if realm := i.Annotations[annotationKubernetesAuthRealm]; realm != "" && realm != traefikDefaultRealm {
|
|
log.Errorf("Value for annotation %q on ingress %s/%s invalid: no realm customization supported", annotationKubernetesAuthRealm, i.ObjectMeta.Namespace, i.ObjectMeta.Name)
|
|
delete(templateObjects.Backends, r.Host+pa.Path)
|
|
continue
|
|
}
|
|
|
|
entryPoints := getSliceAnnotation(i, types.LabelFrontendEntryPoints)
|
|
|
|
whitelistSourceRange := getSliceAnnotation(i, annotationKubernetesWhitelistSourceRange)
|
|
|
|
entryPointRedirect, _ := i.Annotations[types.LabelFrontendRedirect]
|
|
|
|
if _, exists := templateObjects.Frontends[r.Host+pa.Path]; !exists {
|
|
basicAuthCreds, err := handleBasicAuthConfig(i, k8sClient)
|
|
if err != nil {
|
|
log.Errorf("Failed to retrieve basic auth configuration for ingress %s/%s: %s", i.ObjectMeta.Namespace, i.ObjectMeta.Name, err)
|
|
continue
|
|
}
|
|
|
|
priority := getPriority(i)
|
|
|
|
headers := types.Headers{
|
|
CustomRequestHeaders: getMapAnnotation(i, annotationKubernetesCustomRequestHeaders),
|
|
CustomResponseHeaders: getMapAnnotation(i, annotationKubernetesCustomResponseHeaders),
|
|
AllowedHosts: getSliceAnnotation(i, annotationKubernetesAllowedHosts),
|
|
HostsProxyHeaders: getSliceAnnotation(i, annotationKubernetesProxyHeaders),
|
|
SSLRedirect: getBoolAnnotation(i, annotationKubernetesSSLRedirect, false),
|
|
SSLTemporaryRedirect: getBoolAnnotation(i, annotationKubernetesSSLTemporaryRedirect, false),
|
|
SSLHost: getStringAnnotation(i, annotationKubernetesSSLHost),
|
|
SSLProxyHeaders: getMapAnnotation(i, annotationKubernetesSSLProxyHeaders),
|
|
STSSeconds: getSTSSeconds(i),
|
|
STSIncludeSubdomains: getBoolAnnotation(i, annotationKubernetesHSTSIncludeSubdomains, false),
|
|
STSPreload: getBoolAnnotation(i, annotationKubernetesHSTSPreload, false),
|
|
ForceSTSHeader: getBoolAnnotation(i, annotationKubernetesForceHSTSHeader, false),
|
|
FrameDeny: getBoolAnnotation(i, annotationKubernetesFrameDeny, false),
|
|
CustomFrameOptionsValue: getStringAnnotation(i, annotationKubernetesCustomFrameOptionsValue),
|
|
ContentTypeNosniff: getBoolAnnotation(i, annotationKubernetesContentTypeNosniff, false),
|
|
BrowserXSSFilter: getBoolAnnotation(i, annotationKubernetesBrowserXSSFilter, false),
|
|
ContentSecurityPolicy: getStringAnnotation(i, annotationKubernetesContentSecurityPolicy),
|
|
PublicKey: getStringAnnotation(i, annotationKubernetesPublicKey),
|
|
ReferrerPolicy: getStringAnnotation(i, annotationKubernetesReferrerPolicy),
|
|
IsDevelopment: getBoolAnnotation(i, annotationKubernetesIsDevelopment, false),
|
|
}
|
|
|
|
templateObjects.Frontends[r.Host+pa.Path] = &types.Frontend{
|
|
Backend: r.Host + pa.Path,
|
|
PassHostHeader: passHostHeader,
|
|
PassTLSCert: passTLSCert,
|
|
Routes: make(map[string]types.Route),
|
|
Priority: priority,
|
|
BasicAuth: basicAuthCreds,
|
|
WhitelistSourceRange: whitelistSourceRange,
|
|
Redirect: entryPointRedirect,
|
|
EntryPoints: entryPoints,
|
|
Headers: headers,
|
|
}
|
|
}
|
|
if len(r.Host) > 0 {
|
|
rule := "Host:" + r.Host
|
|
|
|
if strings.Contains(r.Host, "*") {
|
|
rule = "HostRegexp:" + strings.Replace(r.Host, "*", "{subdomain:[A-Za-z0-9-_]+}", 1)
|
|
}
|
|
|
|
if _, exists := templateObjects.Frontends[r.Host+pa.Path].Routes[r.Host]; !exists {
|
|
templateObjects.Frontends[r.Host+pa.Path].Routes[r.Host] = types.Route{
|
|
Rule: rule,
|
|
}
|
|
}
|
|
}
|
|
|
|
rule := getRuleForPath(pa, i)
|
|
if rule != "" {
|
|
templateObjects.Frontends[r.Host+pa.Path].Routes[pa.Path] = types.Route{
|
|
Rule: rule,
|
|
}
|
|
}
|
|
|
|
service, exists, err := k8sClient.GetService(i.ObjectMeta.Namespace, pa.Backend.ServiceName)
|
|
if err != nil {
|
|
log.Errorf("Error while retrieving service information from k8s API %s/%s: %v", i.ObjectMeta.Namespace, pa.Backend.ServiceName, err)
|
|
return nil, err
|
|
}
|
|
|
|
if !exists {
|
|
log.Errorf("Service not found for %s/%s", i.ObjectMeta.Namespace, pa.Backend.ServiceName)
|
|
delete(templateObjects.Frontends, r.Host+pa.Path)
|
|
continue
|
|
}
|
|
|
|
if expression := service.Annotations[types.LabelTraefikBackendCircuitbreaker]; expression != "" {
|
|
templateObjects.Backends[r.Host+pa.Path].CircuitBreaker = &types.CircuitBreaker{
|
|
Expression: expression,
|
|
}
|
|
}
|
|
|
|
if service.Annotations[types.LabelBackendLoadbalancerMethod] == "drr" {
|
|
templateObjects.Backends[r.Host+pa.Path].LoadBalancer.Method = "drr"
|
|
}
|
|
|
|
if sticky := service.Annotations[types.LabelBackendLoadbalancerSticky]; len(sticky) > 0 {
|
|
log.Warnf("Deprecated configuration found: %s. Please use %s.", types.LabelBackendLoadbalancerSticky, types.LabelBackendLoadbalancerStickiness)
|
|
templateObjects.Backends[r.Host+pa.Path].LoadBalancer.Sticky = strings.EqualFold(strings.TrimSpace(sticky), "true")
|
|
}
|
|
|
|
if service.Annotations[types.LabelBackendLoadbalancerStickiness] == "true" {
|
|
templateObjects.Backends[r.Host+pa.Path].LoadBalancer.Stickiness = &types.Stickiness{}
|
|
if cookieName := service.Annotations[types.LabelBackendLoadbalancerStickinessCookieName]; len(cookieName) > 0 {
|
|
templateObjects.Backends[r.Host+pa.Path].LoadBalancer.Stickiness.CookieName = cookieName
|
|
}
|
|
}
|
|
|
|
protocol := "http"
|
|
for _, port := range service.Spec.Ports {
|
|
if equalPorts(port, pa.Backend.ServicePort) {
|
|
if port.Port == 443 {
|
|
protocol = "https"
|
|
}
|
|
|
|
if service.Spec.Type == "ExternalName" {
|
|
url := protocol + "://" + service.Spec.ExternalName
|
|
name := url
|
|
|
|
templateObjects.Backends[r.Host+pa.Path].Servers[name] = types.Server{
|
|
URL: url,
|
|
Weight: 1,
|
|
}
|
|
} else {
|
|
endpoints, exists, err := k8sClient.GetEndpoints(service.ObjectMeta.Namespace, service.ObjectMeta.Name)
|
|
if err != nil {
|
|
log.Errorf("Error retrieving endpoints %s/%s: %v", service.ObjectMeta.Namespace, service.ObjectMeta.Name, err)
|
|
return nil, err
|
|
}
|
|
|
|
if !exists {
|
|
log.Warnf("Endpoints not found for %s/%s", service.ObjectMeta.Namespace, service.ObjectMeta.Name)
|
|
break
|
|
}
|
|
|
|
if len(endpoints.Subsets) == 0 {
|
|
log.Warnf("Endpoints not available for %s/%s", service.ObjectMeta.Namespace, service.ObjectMeta.Name)
|
|
break
|
|
}
|
|
|
|
for _, subset := range endpoints.Subsets {
|
|
for _, address := range subset.Addresses {
|
|
url := protocol + "://" + address.IP + ":" + strconv.Itoa(endpointPortNumber(port, subset.Ports))
|
|
name := url
|
|
if address.TargetRef != nil && address.TargetRef.Name != "" {
|
|
name = address.TargetRef.Name
|
|
}
|
|
templateObjects.Backends[r.Host+pa.Path].Servers[name] = types.Server{
|
|
URL: url,
|
|
Weight: 1,
|
|
}
|
|
}
|
|
}
|
|
}
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return &templateObjects, nil
|
|
}
|
|
|
|
func (p Provider) loadConfig(templateObjects types.Configuration) *types.Configuration {
|
|
var FuncMap = template.FuncMap{}
|
|
configuration, err := p.GetConfiguration("templates/kubernetes.tmpl", FuncMap, templateObjects)
|
|
if err != nil {
|
|
log.Error(err)
|
|
}
|
|
return configuration
|
|
}
|
|
|
|
func getSTSSeconds(i *v1beta1.Ingress) int64 {
|
|
value, err := strconv.ParseInt(i.ObjectMeta.Annotations[annotationKubernetesHSTSMaxAge], 10, 64)
|
|
if err == nil && value > 0 {
|
|
return value
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func getRuleForPath(pa v1beta1.HTTPIngressPath, i *v1beta1.Ingress) string {
|
|
if len(pa.Path) == 0 {
|
|
return ""
|
|
}
|
|
|
|
ruleType := i.Annotations[types.LabelFrontendRuleType]
|
|
if ruleType == "" {
|
|
ruleType = ruleTypePathPrefix
|
|
}
|
|
|
|
rules := []string{ruleType + ":" + pa.Path}
|
|
|
|
if rewriteTarget := i.Annotations[annotationKubernetesRewriteTarget]; rewriteTarget != "" {
|
|
rules = append(rules, ruleTypeReplacePath+":"+rewriteTarget)
|
|
}
|
|
|
|
return strings.Join(rules, ";")
|
|
}
|
|
|
|
func getPriority(i *v1beta1.Ingress) int {
|
|
priority := 0
|
|
|
|
priorityRaw, ok := i.Annotations[types.LabelFrontendPriority]
|
|
if ok {
|
|
priorityParsed, err := strconv.Atoi(priorityRaw)
|
|
|
|
if err == nil {
|
|
priority = priorityParsed
|
|
} else {
|
|
log.Errorf("Error in ingress: failed to parse %q value %q.", types.LabelFrontendPriority, priorityRaw)
|
|
}
|
|
}
|
|
|
|
return priority
|
|
}
|
|
|
|
func handleBasicAuthConfig(i *v1beta1.Ingress, k8sClient Client) ([]string, error) {
|
|
authType, exists := i.Annotations[annotationKubernetesAuthType]
|
|
if !exists {
|
|
return nil, nil
|
|
}
|
|
if strings.ToLower(authType) != "basic" {
|
|
return nil, fmt.Errorf("unsupported auth-type on annotation ingress.kubernetes.io/auth-type: %q", authType)
|
|
}
|
|
authSecret := i.Annotations[annotationKubernetesAuthSecret]
|
|
if authSecret == "" {
|
|
return nil, errors.New("auth-secret annotation ingress.kubernetes.io/auth-secret must be set")
|
|
}
|
|
basicAuthCreds, err := loadAuthCredentials(i.Namespace, authSecret, k8sClient)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to load auth credentials: %s", err)
|
|
}
|
|
return basicAuthCreds, nil
|
|
}
|
|
|
|
func loadAuthCredentials(namespace, secretName string, k8sClient Client) ([]string, error) {
|
|
secret, ok, err := k8sClient.GetSecret(namespace, secretName)
|
|
switch { // keep order of case conditions
|
|
case err != nil:
|
|
return nil, fmt.Errorf("failed to fetch secret %q/%q: %s", namespace, secretName, err)
|
|
case !ok:
|
|
return nil, fmt.Errorf("secret %q/%q not found", namespace, secretName)
|
|
case secret == nil:
|
|
return nil, fmt.Errorf("data for secret %q/%q must not be nil", namespace, secretName)
|
|
case len(secret.Data) != 1:
|
|
return nil, fmt.Errorf("found %d elements for secret %q/%q, must be single element exactly", len(secret.Data), namespace, secretName)
|
|
default:
|
|
}
|
|
var firstSecret []byte
|
|
for _, v := range secret.Data {
|
|
firstSecret = v
|
|
break
|
|
}
|
|
creds := make([]string, 0)
|
|
scanner := bufio.NewScanner(bytes.NewReader(firstSecret))
|
|
for scanner.Scan() {
|
|
if cred := scanner.Text(); cred != "" {
|
|
creds = append(creds, cred)
|
|
}
|
|
}
|
|
if len(creds) == 0 {
|
|
return nil, fmt.Errorf("secret %q/%q does not contain any credentials", namespace, secretName)
|
|
}
|
|
|
|
return creds, nil
|
|
}
|
|
|
|
func endpointPortNumber(servicePort v1.ServicePort, endpointPorts []v1.EndpointPort) int {
|
|
if len(endpointPorts) > 0 {
|
|
//name is optional if there is only one port
|
|
port := endpointPorts[0]
|
|
for _, endpointPort := range endpointPorts {
|
|
if servicePort.Name == endpointPort.Name {
|
|
port = endpointPort
|
|
}
|
|
}
|
|
return int(port.Port)
|
|
}
|
|
return int(servicePort.Port)
|
|
}
|
|
|
|
func equalPorts(servicePort v1.ServicePort, ingressPort intstr.IntOrString) bool {
|
|
if int(servicePort.Port) == ingressPort.IntValue() {
|
|
return true
|
|
}
|
|
if servicePort.Name != "" && servicePort.Name == ingressPort.String() {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func shouldProcessIngress(ingressClass string) bool {
|
|
switch ingressClass {
|
|
case "", "traefik":
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|