k3s/pkg/cluster/https.go

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package cluster
import (
"context"
"crypto/tls"
"errors"
"io/ioutil"
"log"
"net"
"net/http"
"os"
"path/filepath"
"github.com/rancher/dynamiclistener"
"github.com/rancher/dynamiclistener/factory"
"github.com/rancher/dynamiclistener/storage/file"
"github.com/rancher/dynamiclistener/storage/kubernetes"
"github.com/rancher/dynamiclistener/storage/memory"
"github.com/rancher/k3s/pkg/daemons/config"
"github.com/rancher/k3s/pkg/etcd"
"github.com/rancher/k3s/pkg/version"
"github.com/rancher/wrangler/pkg/generated/controllers/core"
"github.com/sirupsen/logrus"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// newListener returns a new TCP listener and HTTP request handler using dynamiclistener.
// dynamiclistener will use the cluster's Server CA to sign the dynamically generate certificate,
// and will sync the certs into the Kubernetes datastore, with a local disk cache.
func (c *Cluster) newListener(ctx context.Context) (net.Listener, http.Handler, error) {
if c.managedDB != nil {
if _, err := os.Stat(etcd.ResetFile(c.config)); err == nil {
// delete the dynamic listener file if it exists after restoration to fix restoration
// on fresh nodes
os.Remove(filepath.Join(c.config.DataDir, "tls/dynamic-cert.json"))
}
}
tcp, err := dynamiclistener.NewTCPListener(c.config.BindAddress, c.config.SupervisorPort)
if err != nil {
return nil, nil, err
}
cert, key, err := factory.LoadCerts(c.runtime.ServerCA, c.runtime.ServerCAKey)
if err != nil {
return nil, nil, err
}
storage := tlsStorage(ctx, c.config.DataDir, c.runtime)
return dynamiclistener.NewListener(tcp, storage, cert, key, dynamiclistener.Config{
ExpirationDaysCheck: config.CertificateRenewDays,
Organization: []string{version.Program},
SANs: append(c.config.SANs, "kubernetes", "kubernetes.default", "kubernetes.default.svc", "kubernetes.default.svc."+c.config.ClusterDomain),
CN: version.Program,
TLSConfig: &tls.Config{
ClientAuth: tls.RequestClientCert,
MinVersion: c.config.TLSMinVersion,
CipherSuites: c.config.TLSCipherSuites,
},
RegenerateCerts: func() bool {
const regenerateDynamicListenerFile = "dynamic-cert-regenerate"
dynamicListenerRegenFilePath := filepath.Join(c.config.DataDir, "tls", regenerateDynamicListenerFile)
if _, err := os.Stat(dynamicListenerRegenFilePath); err == nil {
os.Remove(dynamicListenerRegenFilePath)
return true
}
return false
},
})
}
// initClusterAndHTTPS sets up the dynamic tls listener, request router,
// and cluster database. Once the database is up, it starts the supervisor http server.
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func (c *Cluster) initClusterAndHTTPS(ctx context.Context) error {
// Set up dynamiclistener TLS listener and request handler
listener, handler, err := c.newListener(ctx)
if err != nil {
return err
}
// Get the base request handler
handler, err = c.getHandler(handler)
if err != nil {
return err
}
// Config the cluster database and allow it to add additional request handlers
handler, err = c.initClusterDB(ctx, handler)
if err != nil {
return err
}
// Create a HTTP server with the registered request handlers, using logrus for logging
server := http.Server{
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Handler: handler,
}
if logrus.IsLevelEnabled(logrus.DebugLevel) {
server.ErrorLog = log.New(logrus.StandardLogger().Writer(), "Cluster-Http-Server ", log.LstdFlags)
} else {
server.ErrorLog = log.New(ioutil.Discard, "Cluster-Http-Server", 0)
}
// Start the supervisor http server on the tls listener
go func() {
err := server.Serve(listener)
if err != nil && !errors.Is(err, http.ErrServerClosed) {
logrus.Fatalf("server stopped: %v", err)
}
}()
// Shutdown the http server when the context is closed
go func() {
<-ctx.Done()
server.Shutdown(context.Background())
}()
return nil
}
// tlsStorage creates an in-memory cache for dynamiclistener's certificate, backed by a file on disk
// and the Kubernetes datastore.
func tlsStorage(ctx context.Context, dataDir string, runtime *config.ControlRuntime) dynamiclistener.TLSStorage {
fileStorage := file.New(filepath.Join(dataDir, "tls/dynamic-cert.json"))
cache := memory.NewBacked(fileStorage)
return kubernetes.New(ctx, func() *core.Factory {
return runtime.Core
}, metav1.NamespaceSystem, version.Program+"-serving", cache)
}