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server.go
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server.go
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package server
import (
"bytes"
"context"
"crypto/tls"
"crypto/x509"
"encoding/json"
"encoding/pem"
"fmt"
"io"
"net/http"
"os"
"strings"
"time"
"go.uber.org/zap"
"github.com/tektoncd/triggers/pkg/apis/triggers/v1alpha1"
triggersv1 "github.com/tektoncd/triggers/pkg/apis/triggers/v1beta1"
triggersv1alpha1 "github.com/tektoncd/triggers/pkg/client/clientset/versioned/typed/triggers/v1alpha1"
"github.com/tektoncd/triggers/pkg/interceptors"
"github.com/tektoncd/triggers/pkg/interceptors/bitbucket"
"github.com/tektoncd/triggers/pkg/interceptors/cel"
"github.com/tektoncd/triggers/pkg/interceptors/github"
"github.com/tektoncd/triggers/pkg/interceptors/gitlab"
"github.com/tektoncd/triggers/pkg/interceptors/slack"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
secretInformer "knative.dev/pkg/client/injection/kube/informers/core/v1/secret"
"knative.dev/pkg/system"
certresources "knative.dev/pkg/webhook/certificates/resources"
)
const (
Decade = 100 * 365 * 24 * time.Hour
interceptorTLSSecretKey = "INTERCEPTOR_TLS_SECRET_NAME"
interceptorTLSSvcKey = "INTERCEPTOR_TLS_SVC_NAME"
)
type keypairReloader struct {
caCertData []byte
serverCertData []byte
}
type Server struct {
Logger *zap.SugaredLogger
interceptors map[string]triggersv1.InterceptorInterface
}
// RegisterInterceptor sets up the interceptor to be served at the specfied path
func (is *Server) RegisterInterceptor(path string, interceptor triggersv1.InterceptorInterface) {
if is.interceptors == nil {
is.interceptors = map[string]triggersv1.InterceptorInterface{}
}
is.interceptors[path] = interceptor
}
func NewWithCoreInterceptors(sg interceptors.SecretGetter, logger *zap.SugaredLogger) (*Server, error) {
i := map[string]triggersv1.InterceptorInterface{
"bitbucket": bitbucket.NewInterceptor(sg),
"cel": cel.NewInterceptor(sg),
"github": github.NewInterceptor(sg),
"gitlab": gitlab.NewInterceptor(sg),
"slack": slack.NewInterceptor(sg),
}
for k, v := range i {
if v == nil {
return nil, fmt.Errorf("interceptor %s failed to initialize", k)
}
}
s := Server{
Logger: logger,
interceptors: i,
}
return &s, nil
}
func (is *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
b, err := is.ExecuteInterceptor(r)
if err != nil {
switch e := err.(type) {
case Error:
is.Logger.Infof("HTTP %d - %s", e.Status(), e)
http.Error(w, e.Error(), e.Status())
default:
is.Logger.Errorf("Non Status Error: %s", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
}
w.Header().Add("Content-Type", "application/json")
if _, err := w.Write(b); err != nil {
is.Logger.Errorf("failed to write response: %s", err)
}
}
// Error represents a handler error. It provides methods for a HTTP status
// code and embeds the built-in error interface.
type Error interface {
error
Status() int
}
// HTTPError represents an error with an associated HTTP status code.
type HTTPError struct {
Code int
Err error
}
// Allows HTTPError to satisfy the error interface.
func (se HTTPError) Error() string {
return se.Err.Error()
}
// Returns our HTTP status code.
func (se HTTPError) Status() int {
return se.Code
}
func badRequest(err error) HTTPError {
return HTTPError{Code: http.StatusBadRequest, Err: err}
}
func internal(err error) HTTPError {
return HTTPError{Code: http.StatusInternalServerError, Err: err}
}
func (is *Server) ExecuteInterceptor(r *http.Request) ([]byte, error) {
var ii triggersv1.InterceptorInterface
// Find correct interceptor
ii, ok := is.interceptors[strings.TrimPrefix(strings.ToLower(r.URL.Path), "/")]
if !ok {
return nil, badRequest(fmt.Errorf("path did not match any interceptors"))
}
// Create a context
ctx, cancel := context.WithTimeout(r.Context(), 3*time.Second)
defer cancel()
var body bytes.Buffer
defer r.Body.Close()
if _, err := io.Copy(&body, r.Body); err != nil {
return nil, internal(fmt.Errorf("failed to read body: %w", err))
}
var ireq triggersv1.InterceptorRequest
if err := json.Unmarshal(body.Bytes(), &ireq); err != nil {
return nil, badRequest(fmt.Errorf("failed to parse body as InterceptorRequest: %w", err))
}
is.Logger.Debugf("Interceptor Request is: %+v", ireq)
iresp := ii.Process(ctx, &ireq)
is.Logger.Infof("Interceptor response is: %+v", iresp)
respBytes, err := json.Marshal(iresp)
if err != nil {
return nil, internal(err)
}
return respBytes, nil
}
func CreateAndValidateCerts(ctx context.Context, coreV1Interface corev1.CoreV1Interface, logger *zap.SugaredLogger, service *Server, tc triggersv1alpha1.TriggersV1alpha1Interface) {
serverCert, caCert, err := createCerts(ctx, coreV1Interface, time.Now().Add(Decade), logger)
if err != nil {
return
}
if err := service.listAndUpdateClusterInterceptorCRD(ctx, tc, caCert); err != nil {
return
}
// After creating certificates using CreateCerts lets validate validity of created certificates
service.checkCertValidity(ctx, serverCert, caCert, coreV1Interface, logger, tc, time.Minute)
}
func createCerts(ctx context.Context, coreV1Interface corev1.CoreV1Interface, noAfter time.Time, logger *zap.SugaredLogger) ([]byte, []byte, error) {
interceptorSvcName := os.Getenv(interceptorTLSSvcKey)
interceptorSecretName := os.Getenv(interceptorTLSSecretKey)
namespace := system.Namespace()
secret, err := coreV1Interface.Secrets(namespace).Get(ctx, interceptorSecretName, metav1.GetOptions{})
if err != nil {
if apierrors.IsNotFound(err) {
// The secret should be created explicitly by a higher-level system
// that's responsible for install/updates. We simply populate the
// secret information.
logger.Infof("secret %s is missing", interceptorSecretName)
return []byte{}, []byte{}, err
}
logger.Infof("error accessing certificate secret %q: %v", interceptorSecretName, err)
return []byte{}, []byte{}, err
}
serverKey, serverCert, caCert, err := certresources.CreateCerts(ctx, interceptorSvcName, namespace, noAfter)
if err != nil {
logger.Errorf("failed to create certs : %v", err)
return []byte{}, []byte{}, err
}
secret.Data = map[string][]byte{
certresources.ServerKey: serverKey,
certresources.ServerCert: serverCert,
certresources.CACert: caCert,
}
if _, err = coreV1Interface.Secrets(namespace).Update(ctx, secret, metav1.UpdateOptions{}); err != nil {
logger.Errorf("failed to update secret : %v", err)
return []byte{}, []byte{}, err
}
return serverCert, caCert, nil
}
// updateCRDWithCaCert updates clusterinterceptor crd caBundle with caCert
func (is *Server) updateCRDWithCaCert(ctx context.Context, triggersV1Alpha1 triggersv1alpha1.TriggersV1alpha1Interface,
ci []v1alpha1.ClusterInterceptor, caCert []byte) error {
for i := range ci {
if _, ok := is.interceptors[ci[i].Name]; ok {
if bytes.Equal(ci[i].Spec.ClientConfig.CaBundle, []byte{}) || !bytes.Equal(ci[i].Spec.ClientConfig.CaBundle, caCert) {
ci[i].Spec.ClientConfig.CaBundle = caCert
if _, err := triggersV1Alpha1.ClusterInterceptors().Update(ctx, &ci[i], metav1.UpdateOptions{}); err != nil {
return err
}
}
}
}
return nil
}
func (is *Server) checkCertValidity(ctx context.Context, serverCert, caCert []byte, coreV1Interface corev1.CoreV1Interface,
logger *zap.SugaredLogger, tc triggersv1alpha1.TriggersV1alpha1Interface, tickerTime time.Duration) {
result := &keypairReloader{
caCertData: caCert,
serverCertData: serverCert,
}
ticker := time.NewTicker(tickerTime)
var (
cert *x509.Certificate
err error
)
go func() {
for {
<-ticker.C
// Check the expiration date of the certificate to see if it needs to be updated
roots := x509.NewCertPool()
ok := roots.AppendCertsFromPEM(result.caCertData)
if !ok {
logger.Error("failed to parse root certificate")
}
block, _ := pem.Decode(result.serverCertData)
if block == nil {
logger.Error("failed to parse certificate PEM")
} else {
cert, err = x509.ParseCertificate(block.Bytes)
if err != nil {
logger.Errorf("failed to parse certificate: %v", err.Error())
}
}
opts := x509.VerifyOptions{
Roots: roots,
}
if _, err := cert.Verify(opts); err != nil {
logger.Errorf("failed to verify certificate: %v", err.Error())
serverCertNew, caCertNew, err := createCerts(ctx, coreV1Interface, time.Now().Add(Decade), logger)
if err != nil {
logger.Errorf("failed to create certs %v", err)
}
result = &keypairReloader{
caCertData: caCertNew,
serverCertData: serverCertNew,
}
if err := is.listAndUpdateClusterInterceptorCRD(ctx, tc, caCertNew); err != nil {
logger.Error(err.Error())
}
}
}
}()
}
func (is *Server) listAndUpdateClusterInterceptorCRD(ctx context.Context, tc triggersv1alpha1.TriggersV1alpha1Interface, caCert []byte) error {
clusterInterceptorList, err := tc.ClusterInterceptors().List(ctx, metav1.ListOptions{})
if err != nil {
return err
}
return is.updateCRDWithCaCert(ctx, tc, clusterInterceptorList.Items, caCert)
}
func GetTLSData(ctx context.Context, logger *zap.SugaredLogger) (*tls.Certificate, error) {
secret, err := secretInformer.Get(ctx).Lister().Secrets(system.Namespace()).Get(os.Getenv(interceptorTLSSecretKey))
if err != nil {
logger.Errorf("failed to fetch secret %v", err)
return nil, err
}
serverKey, ok := secret.Data[certresources.ServerKey]
if !ok {
logger.Warn("server key missing")
return nil, fmt.Errorf("server key missing")
}
serverCert, ok := secret.Data[certresources.ServerCert]
if !ok {
logger.Warn("server cert missing")
return nil, fmt.Errorf("server cert missing")
}
cert, err := tls.X509KeyPair(serverCert, serverKey)
return &cert, err
}
func UpdateCACertToClusterInterceptorCRD(ctx context.Context, service *Server, tc triggersv1alpha1.TriggersV1alpha1Interface, logger *zap.SugaredLogger, timer time.Duration) {
interceptorSecretName := os.Getenv(interceptorTLSSecretKey)
ticker := time.NewTicker(timer)
go func() {
for {
<-ticker.C
secret, err := secretInformer.Get(ctx).Lister().Secrets(system.Namespace()).Get(interceptorSecretName)
if err != nil {
logger.Errorf("failed to fetch secret %v", err)
return
}
caCert, ok := secret.Data[certresources.CACert]
if !ok {
logger.Warn("CACert key missing")
return
}
if err := service.listAndUpdateClusterInterceptorCRD(ctx, tc, caCert); err != nil {
return
}
}
}()
}