mirror of
https://github.com/k3s-io/k3s.git
synced 2024-06-07 19:41:36 +00:00
543 lines
17 KiB
Go
543 lines
17 KiB
Go
package server
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import (
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"context"
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"crypto"
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"crypto/x509"
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"fmt"
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"net"
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"net/http"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/gorilla/mux"
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"github.com/k3s-io/k3s/pkg/bootstrap"
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"github.com/k3s-io/k3s/pkg/cli/cmds"
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"github.com/k3s-io/k3s/pkg/daemons/config"
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"github.com/k3s-io/k3s/pkg/generated/clientset/versioned/scheme"
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"github.com/k3s-io/k3s/pkg/nodepassword"
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"github.com/k3s-io/k3s/pkg/util"
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"github.com/k3s-io/k3s/pkg/version"
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"github.com/pkg/errors"
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certutil "github.com/rancher/dynamiclistener/cert"
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coreclient "github.com/rancher/wrangler/pkg/generated/controllers/core/v1"
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"github.com/sirupsen/logrus"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/util/json"
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"k8s.io/apiserver/pkg/authentication/user"
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"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
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"k8s.io/apiserver/pkg/endpoints/request"
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bootstrapapi "k8s.io/cluster-bootstrap/token/api"
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"k8s.io/kubernetes/pkg/auth/nodeidentifier"
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)
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const (
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staticURL = "/static/"
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)
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var (
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identifier = nodeidentifier.NewDefaultNodeIdentifier()
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)
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func router(ctx context.Context, config *Config, cfg *cmds.Server) http.Handler {
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serverConfig := &config.ControlConfig
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nodeAuth := passwordBootstrap(ctx, config)
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prefix := "/v1-" + version.Program
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authed := mux.NewRouter().SkipClean(true)
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authed.Use(authMiddleware(serverConfig, version.Program+":agent", user.NodesGroup, bootstrapapi.BootstrapDefaultGroup))
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authed.Path(prefix + "/serving-kubelet.crt").Handler(servingKubeletCert(serverConfig, serverConfig.Runtime.ServingKubeletKey, nodeAuth))
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authed.Path(prefix + "/client-kubelet.crt").Handler(clientKubeletCert(serverConfig, serverConfig.Runtime.ClientKubeletKey, nodeAuth))
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authed.Path(prefix + "/client-kube-proxy.crt").Handler(fileHandler(serverConfig.Runtime.ClientKubeProxyCert, serverConfig.Runtime.ClientKubeProxyKey))
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authed.Path(prefix + "/client-" + version.Program + "-controller.crt").Handler(fileHandler(serverConfig.Runtime.ClientK3sControllerCert, serverConfig.Runtime.ClientK3sControllerKey))
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authed.Path(prefix + "/client-ca.crt").Handler(fileHandler(serverConfig.Runtime.ClientCA))
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authed.Path(prefix + "/server-ca.crt").Handler(fileHandler(serverConfig.Runtime.ServerCA))
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authed.Path(prefix + "/apiservers").Handler(apiserversHandler(serverConfig))
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authed.Path(prefix + "/config").Handler(configHandler(serverConfig, cfg))
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authed.Path(prefix + "/readyz").Handler(readyzHandler(serverConfig))
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if cfg.DisableAPIServer {
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authed.NotFoundHandler = apiserverDisabled()
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} else {
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authed.NotFoundHandler = apiserver(serverConfig.Runtime)
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}
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nodeAuthed := mux.NewRouter().SkipClean(true)
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nodeAuthed.NotFoundHandler = authed
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nodeAuthed.Use(authMiddleware(serverConfig, user.NodesGroup))
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nodeAuthed.Path(prefix + "/connect").Handler(serverConfig.Runtime.Tunnel)
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serverAuthed := mux.NewRouter().SkipClean(true)
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serverAuthed.NotFoundHandler = nodeAuthed
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serverAuthed.Use(authMiddleware(serverConfig, version.Program+":server"))
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serverAuthed.Path(prefix + "/encrypt/status").Handler(encryptionStatusHandler(serverConfig))
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serverAuthed.Path(prefix + "/encrypt/config").Handler(encryptionConfigHandler(ctx, serverConfig))
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serverAuthed.Path(prefix + "/cert/cacerts").Handler(caCertReplaceHandler(serverConfig))
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serverAuthed.Path("/db/info").Handler(nodeAuthed)
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serverAuthed.Path(prefix + "/server-bootstrap").Handler(bootstrapHandler(serverConfig.Runtime))
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systemAuthed := mux.NewRouter().SkipClean(true)
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systemAuthed.NotFoundHandler = serverAuthed
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systemAuthed.MethodNotAllowedHandler = serverAuthed
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systemAuthed.Use(authMiddleware(serverConfig, user.SystemPrivilegedGroup))
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systemAuthed.Methods(http.MethodConnect).Handler(serverConfig.Runtime.Tunnel)
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staticDir := filepath.Join(serverConfig.DataDir, "static")
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router := mux.NewRouter().SkipClean(true)
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router.NotFoundHandler = systemAuthed
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router.PathPrefix(staticURL).Handler(serveStatic(staticURL, staticDir))
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router.Path("/cacerts").Handler(cacerts(serverConfig.Runtime.ServerCA))
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router.Path("/ping").Handler(ping())
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return router
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}
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func apiserver(runtime *config.ControlRuntime) http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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if runtime != nil && runtime.APIServer != nil {
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runtime.APIServer.ServeHTTP(resp, req)
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} else {
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responsewriters.ErrorNegotiated(
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apierrors.NewServiceUnavailable("apiserver not ready"),
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scheme.Codecs.WithoutConversion(), schema.GroupVersion{}, resp, req,
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)
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}
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})
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}
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func apiserverDisabled() http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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responsewriters.ErrorNegotiated(
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apierrors.NewServiceUnavailable("apiserver disabled"),
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scheme.Codecs.WithoutConversion(), schema.GroupVersion{}, resp, req,
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)
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})
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}
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func bootstrapHandler(runtime *config.ControlRuntime) http.Handler {
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if runtime.HTTPBootstrap {
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return bootstrap.Handler(&runtime.ControlRuntimeBootstrap)
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}
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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logrus.Warnf("Received HTTP bootstrap request from %s, but embedded etcd is not enabled.", req.RemoteAddr)
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responsewriters.ErrorNegotiated(
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apierrors.NewBadRequest("etcd disabled"),
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scheme.Codecs.WithoutConversion(), schema.GroupVersion{}, resp, req,
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)
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})
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}
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func cacerts(serverCA string) http.Handler {
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var ca []byte
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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if ca == nil {
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var err error
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ca, err = os.ReadFile(serverCA)
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if err != nil {
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sendError(err, resp)
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return
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}
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}
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resp.Header().Set("content-type", "text/plain")
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resp.Write(ca)
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})
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}
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func getNodeInfo(req *http.Request) (*nodeInfo, error) {
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user, ok := request.UserFrom(req.Context())
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if !ok {
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return nil, errors.New("auth user not set")
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}
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nodeName := req.Header.Get(version.Program + "-Node-Name")
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if nodeName == "" {
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return nil, errors.New("node name not set")
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}
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nodePassword := req.Header.Get(version.Program + "-Node-Password")
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if nodePassword == "" {
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return nil, errors.New("node password not set")
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}
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return &nodeInfo{
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Name: strings.ToLower(nodeName),
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Password: nodePassword,
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User: user,
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}, nil
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}
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func getCACertAndKeys(caCertFile, caKeyFile, signingKeyFile string) ([]*x509.Certificate, crypto.Signer, crypto.Signer, error) {
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keyBytes, err := os.ReadFile(signingKeyFile)
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if err != nil {
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return nil, nil, nil, err
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}
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key, err := certutil.ParsePrivateKeyPEM(keyBytes)
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if err != nil {
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return nil, nil, nil, err
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}
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caKeyBytes, err := os.ReadFile(caKeyFile)
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if err != nil {
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return nil, nil, nil, err
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}
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caKey, err := certutil.ParsePrivateKeyPEM(caKeyBytes)
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if err != nil {
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return nil, nil, nil, err
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}
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caBytes, err := os.ReadFile(caCertFile)
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if err != nil {
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return nil, nil, nil, err
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}
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caCert, err := certutil.ParseCertsPEM(caBytes)
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if err != nil {
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return nil, nil, nil, err
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}
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return caCert, caKey.(crypto.Signer), key.(crypto.Signer), nil
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}
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func servingKubeletCert(server *config.Control, keyFile string, auth nodePassBootstrapper) http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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if req.TLS == nil {
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resp.WriteHeader(http.StatusNotFound)
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return
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}
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nodeName, errCode, err := auth(req)
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if err != nil {
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sendError(err, resp, errCode)
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return
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}
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caCert, caKey, key, err := getCACertAndKeys(server.Runtime.ServerCA, server.Runtime.ServerCAKey, server.Runtime.ServingKubeletKey)
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if err != nil {
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sendError(err, resp)
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return
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}
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ips := []net.IP{net.ParseIP("127.0.0.1")}
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if nodeIP := req.Header.Get(version.Program + "-Node-IP"); nodeIP != "" {
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for _, v := range strings.Split(nodeIP, ",") {
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ip := net.ParseIP(v)
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if ip == nil {
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sendError(fmt.Errorf("invalid IP address %s", ip), resp)
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return
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}
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ips = append(ips, ip)
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}
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}
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cert, err := certutil.NewSignedCert(certutil.Config{
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CommonName: nodeName,
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Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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AltNames: certutil.AltNames{
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DNSNames: []string{nodeName, "localhost"},
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IPs: ips,
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},
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}, key, caCert[0], caKey)
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if err != nil {
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sendError(err, resp)
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return
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}
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keyBytes, err := os.ReadFile(keyFile)
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if err != nil {
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http.Error(resp, err.Error(), http.StatusInternalServerError)
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return
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}
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resp.Write(append(certutil.EncodeCertPEM(cert), certutil.EncodeCertPEM(caCert[0])...))
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resp.Write(keyBytes)
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})
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}
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func clientKubeletCert(server *config.Control, keyFile string, auth nodePassBootstrapper) http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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if req.TLS == nil {
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resp.WriteHeader(http.StatusNotFound)
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return
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}
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nodeName, errCode, err := auth(req)
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if err != nil {
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sendError(err, resp, errCode)
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return
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}
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caCert, caKey, key, err := getCACertAndKeys(server.Runtime.ClientCA, server.Runtime.ClientCAKey, server.Runtime.ClientKubeletKey)
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if err != nil {
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sendError(err, resp)
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return
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}
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cert, err := certutil.NewSignedCert(certutil.Config{
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CommonName: "system:node:" + nodeName,
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Organization: []string{user.NodesGroup},
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Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
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}, key, caCert[0], caKey)
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if err != nil {
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sendError(err, resp)
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return
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}
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keyBytes, err := os.ReadFile(keyFile)
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if err != nil {
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http.Error(resp, err.Error(), http.StatusInternalServerError)
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return
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}
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resp.Write(append(certutil.EncodeCertPEM(cert), certutil.EncodeCertPEM(caCert[0])...))
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resp.Write(keyBytes)
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})
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}
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func fileHandler(fileName ...string) http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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if req.TLS == nil {
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resp.WriteHeader(http.StatusNotFound)
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return
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}
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resp.Header().Set("Content-Type", "text/plain")
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if len(fileName) == 1 {
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http.ServeFile(resp, req, fileName[0])
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return
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}
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for _, f := range fileName {
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bytes, err := os.ReadFile(f)
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if err != nil {
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logrus.Errorf("Failed to read %s: %v", f, err)
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resp.WriteHeader(http.StatusInternalServerError)
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return
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}
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resp.Write(bytes)
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}
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})
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}
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func apiserversHandler(server *config.Control) http.Handler {
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var endpointsClient coreclient.EndpointsClient
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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var endpoints []string
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if endpointsClient == nil {
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if server.Runtime.Core != nil {
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endpointsClient = server.Runtime.Core.Core().V1().Endpoints()
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}
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}
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if endpointsClient != nil {
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if endpoint, _ := endpointsClient.Get("default", "kubernetes", metav1.GetOptions{}); endpoint != nil {
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endpoints = util.GetAddresses(endpoint)
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}
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}
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resp.Header().Set("content-type", "application/json")
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if err := json.NewEncoder(resp).Encode(endpoints); err != nil {
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logrus.Errorf("Failed to encode apiserver endpoints: %v", err)
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resp.WriteHeader(http.StatusInternalServerError)
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}
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})
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}
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func configHandler(server *config.Control, cfg *cmds.Server) http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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if req.TLS == nil {
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resp.WriteHeader(http.StatusNotFound)
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return
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}
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// Startup hooks may read and modify cmds.Server in a goroutine, but as these are copied into
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// config.Control before the startup hooks are called, any modifications need to be sync'd back
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// into the struct before it is sent to agents.
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// At this time we don't sync all the fields, just those known to be touched by startup hooks.
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server.DisableKubeProxy = cfg.DisableKubeProxy
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resp.Header().Set("content-type", "application/json")
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if err := json.NewEncoder(resp).Encode(server); err != nil {
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logrus.Errorf("Failed to encode agent config: %v", err)
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resp.WriteHeader(http.StatusInternalServerError)
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}
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})
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}
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func readyzHandler(server *config.Control) http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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code := http.StatusOK
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data := []byte("ok")
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if server.Runtime.Core == nil {
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code = http.StatusInternalServerError
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data = []byte("runtime core not ready")
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}
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resp.WriteHeader(code)
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resp.Header().Set("Content-Type", "text/plain")
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resp.Header().Set("Content-length", strconv.Itoa(len(data)))
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resp.Write(data)
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})
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}
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func ping() http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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data := []byte("pong")
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resp.Header().Set("Content-Type", "text/plain")
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resp.Header().Set("Content-Length", strconv.Itoa(len(data)))
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resp.Write(data)
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})
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}
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func serveStatic(urlPrefix, staticDir string) http.Handler {
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return http.StripPrefix(urlPrefix, http.FileServer(http.Dir(staticDir)))
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}
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func sendError(err error, resp http.ResponseWriter, status ...int) {
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var code int
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if len(status) == 1 {
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code = status[0]
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}
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if code == 0 || code == http.StatusOK {
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code = http.StatusInternalServerError
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}
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logrus.Error(err)
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resp.WriteHeader(code)
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resp.Write([]byte(err.Error()))
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}
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// nodePassBootstrapper returns a node name, or http error code and error
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type nodePassBootstrapper func(req *http.Request) (string, int, error)
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// nodeInfo contains information on the requesting node, derived from auth creds
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// and request headers.
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type nodeInfo struct {
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Name string
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Password string
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User user.Info
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}
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func passwordBootstrap(ctx context.Context, config *Config) nodePassBootstrapper {
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runtime := config.ControlConfig.Runtime
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deferredNodes := map[string]bool{}
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var secretClient coreclient.SecretClient
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var nodeClient coreclient.NodeClient
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var mu sync.Mutex
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return nodePassBootstrapper(func(req *http.Request) (string, int, error) {
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node, err := getNodeInfo(req)
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if err != nil {
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return "", http.StatusBadRequest, err
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}
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nodeName, isNodeAuth := identifier.NodeIdentity(node.User)
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if isNodeAuth && nodeName != node.Name {
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return "", http.StatusBadRequest, errors.New("header node name does not match auth node name")
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}
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if secretClient == nil || nodeClient == nil {
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if runtime.Core != nil {
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// initialize the client if we can
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secretClient = runtime.Core.Core().V1().Secret()
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nodeClient = runtime.Core.Core().V1().Node()
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} else if node.Name == os.Getenv("NODE_NAME") {
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// If we're verifying our own password, verify it locally and ensure a secret later.
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return verifyLocalPassword(ctx, config, &mu, deferredNodes, node)
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} else if config.ControlConfig.DisableAPIServer && !isNodeAuth {
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// If we're running on an etcd-only node, and the request didn't use Node Identity auth,
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// defer node password verification until an apiserver joins the cluster.
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return verifyRemotePassword(ctx, config, &mu, deferredNodes, node)
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} else {
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// Otherwise, reject the request until the core is ready.
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return "", http.StatusServiceUnavailable, errors.New("runtime core not ready")
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}
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}
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if err := verifyNode(ctx, nodeClient, node); err != nil {
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return "", http.StatusUnauthorized, err
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}
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if err := nodepassword.Ensure(secretClient, node.Name, node.Password); err != nil {
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return "", http.StatusForbidden, err
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}
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return node.Name, http.StatusOK, nil
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})
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}
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func verifyLocalPassword(ctx context.Context, config *Config, mu *sync.Mutex, deferredNodes map[string]bool, node *nodeInfo) (string, int, error) {
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// use same password file location that the agent creates
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nodePasswordRoot := "/"
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if config.ControlConfig.Rootless {
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nodePasswordRoot = filepath.Join(config.ControlConfig.DataDir, "agent")
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}
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nodeConfigPath := filepath.Join(nodePasswordRoot, "etc", "rancher", "node")
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nodePasswordFile := filepath.Join(nodeConfigPath, "password")
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passBytes, err := os.ReadFile(nodePasswordFile)
|
|
if err != nil {
|
|
return "", http.StatusInternalServerError, errors.Wrap(err, "unable to read node password file")
|
|
}
|
|
|
|
password := strings.TrimSpace(string(passBytes))
|
|
if password != node.Password {
|
|
return "", http.StatusForbidden, errors.Wrapf(err, "unable to verify local password for node '%s'", node.Name)
|
|
}
|
|
|
|
mu.Lock()
|
|
defer mu.Unlock()
|
|
|
|
if _, ok := deferredNodes[node.Name]; !ok {
|
|
deferredNodes[node.Name] = true
|
|
go ensureSecret(ctx, config, node)
|
|
logrus.Debugf("Password verified locally for node '%s'", node.Name)
|
|
}
|
|
|
|
return node.Name, http.StatusOK, nil
|
|
}
|
|
|
|
func verifyRemotePassword(ctx context.Context, config *Config, mu *sync.Mutex, deferredNodes map[string]bool, node *nodeInfo) (string, int, error) {
|
|
mu.Lock()
|
|
defer mu.Unlock()
|
|
|
|
if _, ok := deferredNodes[node.Name]; !ok {
|
|
deferredNodes[node.Name] = true
|
|
go ensureSecret(ctx, config, node)
|
|
logrus.Debugf("Password verification deferred for node '%s'", node.Name)
|
|
}
|
|
|
|
return node.Name, http.StatusOK, nil
|
|
}
|
|
|
|
func verifyNode(ctx context.Context, nodeClient coreclient.NodeClient, node *nodeInfo) error {
|
|
if nodeName, isNodeAuth := identifier.NodeIdentity(node.User); isNodeAuth {
|
|
if _, err := nodeClient.Get(nodeName, metav1.GetOptions{}); err != nil {
|
|
return errors.Wrap(err, "unable to verify node identity")
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func ensureSecret(ctx context.Context, config *Config, node *nodeInfo) {
|
|
runtime := config.ControlConfig.Runtime
|
|
for {
|
|
select {
|
|
case <-ctx.Done():
|
|
return
|
|
case <-time.After(1 * time.Second):
|
|
if runtime.Core != nil {
|
|
logrus.Debugf("Runtime core has become available, ensuring password secret for node '%s'", node.Name)
|
|
secretClient := runtime.Core.Core().V1().Secret()
|
|
if err := nodepassword.Ensure(secretClient, node.Name, node.Password); err != nil {
|
|
logrus.Warnf("Error ensuring node password secret for pre-validated node '%s': %v", node.Name, err)
|
|
}
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|