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362 lines
9.4 KiB
362 lines
9.4 KiB
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package tiller
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import (
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"crypto/x509"
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"encoding/base64"
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"encoding/pem"
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"errors"
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"fmt"
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"log"
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"os"
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"strings"
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"github.com/spf13/pflag"
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"golang.org/x/net/context"
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"google.golang.org/grpc"
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"google.golang.org/grpc/metadata"
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"k8s.io/helm/pkg/helm"
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"k8s.io/helm/pkg/version"
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authenticationapi "k8s.io/kubernetes/pkg/apis/authentication"
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clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
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rest "k8s.io/kubernetes/pkg/client/restclient"
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"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
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clientcmdapi "k8s.io/kubernetes/pkg/client/unversioned/clientcmd/api"
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utilflag "k8s.io/kubernetes/pkg/util/flag"
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)
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// maxMsgSize use 10MB as the default message size limit.
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// grpc library default is 4MB
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var maxMsgSize = 1024 * 1024 * 10
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// NewServer creates a new grpc server.
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func NewServer() *grpc.Server {
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return grpc.NewServer(
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grpc.MaxMsgSize(maxMsgSize),
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grpc.UnaryInterceptor(newUnaryInterceptor()),
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grpc.StreamInterceptor(newStreamInterceptor()),
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)
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}
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func authenticate(ctx context.Context) (context.Context, error) {
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md, ok := metadata.FromContext(ctx)
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if !ok {
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return nil, errors.New("Missing metadata in context.")
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}
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var user *authenticationapi.UserInfo
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var kubeConfig *rest.Config
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var err error
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authHeader, ok := md[helm.Authorization]
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if !ok || authHeader[0] == "" {
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user, kubeConfig, err = checkClientCert(ctx)
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} else {
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if strings.HasPrefix(authHeader[0], "Bearer ") {
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user, kubeConfig, err = checkBearerAuth(ctx)
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} else if strings.HasPrefix(authHeader[0], "Basic ") {
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user, kubeConfig, err = checkBasicAuth(ctx)
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} else {
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return nil, errors.New("Unknown authorization scheme.")
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}
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}
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if err != nil {
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return nil, err
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}
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ctx = context.WithValue(ctx, helm.K8sUser, user)
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ctx = context.WithValue(ctx, helm.K8sConfig, kubeConfig)
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// TODO: Remove
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if user == nil {
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log.Println("user not found in context")
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} else {
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log.Println("authenticated user:", user)
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}
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return ctx, nil
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}
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func newUnaryInterceptor() grpc.UnaryServerInterceptor {
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return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
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err = checkClientVersion(ctx)
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if err != nil {
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// whitelist GetVersion() from the version check
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if _, m := splitMethod(info.FullMethod); m != "GetVersion" {
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log.Println(err)
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return nil, err
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}
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}
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ctx, err = authenticate(ctx)
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if err != nil {
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log.Println(err)
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return nil, err
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}
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return handler(ctx, req)
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}
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}
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func newStreamInterceptor() grpc.StreamServerInterceptor {
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return func(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
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ctx := ss.Context()
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err := checkClientVersion(ctx)
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if err != nil {
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log.Println(err)
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return err
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}
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ctx, err = authenticate(ctx)
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if err != nil {
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log.Println(err)
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return err
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}
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// TODO: How to pass modified ctx?
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return handler(srv, ss)
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}
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}
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func splitMethod(fullMethod string) (string, string) {
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if frags := strings.Split(fullMethod, "/"); len(frags) == 3 {
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return frags[1], frags[2]
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}
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return "unknown", "unknown"
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}
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func versionFromContext(ctx context.Context) string {
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if md, ok := metadata.FromContext(ctx); ok {
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if v, ok := md["x-helm-api-client"]; ok && len(v) > 0 {
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return v[0]
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}
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}
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return ""
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}
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func checkClientVersion(ctx context.Context) error {
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clientVersion := versionFromContext(ctx)
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if !version.IsCompatible(clientVersion, version.Version) {
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return fmt.Errorf("incompatible versions client: %s server: %s", clientVersion, version.Version)
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}
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return nil
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}
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func checkBearerAuth(ctx context.Context) (*authenticationapi.UserInfo, *rest.Config, error) {
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md, _ := metadata.FromContext(ctx)
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token := md[helm.Authorization][0][len("Bearer "):]
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apiServer, err := getServerURL(md)
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if err != nil {
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return nil, nil, err
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}
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caCert, _ := getCertificateAuthority(md)
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// ref: k8s.io/helm/vendor/k8s.io/kubernetes/pkg/kubectl/cmd/util#NewFactory()
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flags := pflag.NewFlagSet("", pflag.ContinueOnError)
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flags.SetNormalizeFunc(utilflag.WarnWordSepNormalizeFunc) // Warn for "_" flags
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loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
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// use the standard defaults for this client command
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// DEPRECATED: remove and replace with something more accurate
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loadingRules.DefaultClientConfig = &clientcmd.DefaultClientConfig
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flags.StringVar(&loadingRules.ExplicitPath, "kubeconfig", "", "Path to the kubeconfig file to use for CLI requests.")
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overrides := &clientcmd.ConfigOverrides{
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ClusterDefaults: clientcmd.ClusterDefaults,
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ClusterInfo: clientcmdapi.Cluster{
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Server: apiServer,
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CertificateAuthorityData: caCert,
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},
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}
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flagNames := clientcmd.RecommendedConfigOverrideFlags("")
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// short flagnames are disabled by default. These are here for compatibility with existing scripts
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flagNames.ClusterOverrideFlags.APIServer.ShortName = "s"
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clientcmd.BindOverrideFlags(overrides, flags, flagNames)
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tokenConfig, err := clientcmd.NewInteractiveDeferredLoadingClientConfig(loadingRules, overrides, os.Stdin).ClientConfig()
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if err != nil {
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return nil, nil, err
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}
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client, err := clientset.NewForConfig(tokenConfig)
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if err != nil {
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return nil, nil, err
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}
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// verify token
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tokenReq := &authenticationapi.TokenReview{
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Spec: authenticationapi.TokenReviewSpec{
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Token: token,
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},
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}
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result, err := client.AuthenticationClient.TokenReviews().Create(tokenReq)
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if err != nil {
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return nil, nil, err
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}
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if !result.Status.Authenticated {
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return nil, nil, errors.New("Not authenticated")
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}
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kubeConfig := &rest.Config{
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Host: apiServer,
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BearerToken: token,
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TLSClientConfig: rest.TLSClientConfig{
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CAData: caCert,
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},
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}
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return &result.Status.User, kubeConfig, nil
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}
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func checkBasicAuth(ctx context.Context) (*authenticationapi.UserInfo, *rest.Config, error) {
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md, _ := metadata.FromContext(ctx)
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authz := md[helm.Authorization][0]
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apiServer, err := getServerURL(md)
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if err != nil {
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return nil, nil, err
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}
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basicAuth, err := base64.StdEncoding.DecodeString(authz[len("Basic "):])
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if err != nil {
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return nil, nil, err
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}
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username, password := getUserPasswordFromBasicAuth(string(basicAuth))
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if len(username) == 0 || len(password) == 0 {
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return nil, nil, errors.New("Missing username or password.")
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}
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kubeConfig := &rest.Config{
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Host: apiServer,
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Username: username,
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Password: password,
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}
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caCert, err := getCertificateAuthority(md)
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if err == nil {
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kubeConfig.TLSClientConfig = rest.TLSClientConfig{
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CAData: caCert,
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}
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}
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client, err := clientset.NewForConfig(kubeConfig)
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if err != nil {
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return nil, nil, err
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}
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// verify credentials
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_, err = client.DiscoveryClient.ServerVersion()
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if err != nil {
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return nil, nil, err
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}
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return &authenticationapi.UserInfo{
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Username: username,
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}, kubeConfig, nil
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}
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func getUserPasswordFromBasicAuth(token string) (string, string) {
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st := strings.SplitN(token, ":", 2)
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if len(st) == 2 {
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return st[0], st[1]
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}
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return "", ""
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}
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func checkClientCert(ctx context.Context) (*authenticationapi.UserInfo, *rest.Config, error) {
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md, _ := metadata.FromContext(ctx)
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apiServer, err := getServerURL(md)
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if err != nil {
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return nil, nil, err
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}
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kubeConfig := &rest.Config{
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Host: apiServer,
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}
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crt, err := getClientCert(md)
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if err != nil {
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return nil, nil, err
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}
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key, err := getClientKey(md)
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if err != nil {
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return nil, nil, err
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}
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kubeConfig.TLSClientConfig = rest.TLSClientConfig{
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KeyData: key,
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CertData: crt,
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}
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caCert, err := getCertificateAuthority(md)
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if err == nil {
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kubeConfig.TLSClientConfig.CAData = caCert
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}
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client, err := clientset.NewForConfig(kubeConfig)
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if err != nil {
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return nil, nil, err
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}
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// verify credentials
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_, err = client.DiscoveryClient.ServerVersion()
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if err != nil {
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return nil, nil, err
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}
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pem, _ := pem.Decode([]byte(crt))
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c, err := x509.ParseCertificate(pem.Bytes)
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if err != nil {
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return nil, nil, err
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}
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return &authenticationapi.UserInfo{
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Username: c.Subject.CommonName,
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}, kubeConfig, nil
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}
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func getClientCert(md metadata.MD) ([]byte, error) {
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cert, ok := md[helm.K8sClientCertificate]
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if !ok {
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return nil, errors.New("Client certificate not found")
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}
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certData, err := base64.StdEncoding.DecodeString(cert[0])
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if err != nil {
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return nil, err
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}
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return certData, nil
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}
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func getClientKey(md metadata.MD) ([]byte, error) {
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key, ok := md[helm.K8sClientKey]
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if !ok {
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return nil, errors.New("Client key not found")
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}
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keyData, err := base64.StdEncoding.DecodeString(key[0])
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if err != nil {
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return nil, err
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}
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return keyData, nil
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}
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func getCertificateAuthority(md metadata.MD) ([]byte, error) {
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caData, ok := md[helm.K8sCertificateAuthority]
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if !ok {
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return nil, errors.New("CAcert not found")
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}
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caCert, err := base64.StdEncoding.DecodeString(caData[0])
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if err != nil {
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return nil, err
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}
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return caCert, nil
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}
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func getServerURL(md metadata.MD) (string, error) {
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apiserver, ok := md[helm.K8sServer]
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if !ok {
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return "", errors.New("API server url not found")
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}
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return apiserver[0], nil
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}
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