679 lines
21 KiB
Go
679 lines
21 KiB
Go
// Copyright 2020-2022 the Pinniped contributors. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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// Package server defines the entrypoint for the Pinniped Supervisor server.
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package server
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import (
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"context"
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"crypto/rand"
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"crypto/tls"
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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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"os/signal"
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"strconv"
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"strings"
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"sync"
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"syscall"
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"time"
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"github.com/joshlf/go-acl"
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appsv1 "k8s.io/api/apps/v1"
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corev1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/runtime/serializer"
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apimachineryversion "k8s.io/apimachinery/pkg/version"
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genericapifilters "k8s.io/apiserver/pkg/endpoints/filters"
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genericapiserver "k8s.io/apiserver/pkg/server"
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genericoptions "k8s.io/apiserver/pkg/server/options"
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kubeinformers "k8s.io/client-go/informers"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/pkg/version"
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"k8s.io/client-go/rest"
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aggregatorclient "k8s.io/kube-aggregator/pkg/client/clientset_generated/clientset"
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"k8s.io/utils/clock"
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configv1alpha1 "go.pinniped.dev/generated/latest/apis/supervisor/config/v1alpha1"
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pinnipedclientset "go.pinniped.dev/generated/latest/client/supervisor/clientset/versioned"
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pinnipedinformers "go.pinniped.dev/generated/latest/client/supervisor/informers/externalversions"
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"go.pinniped.dev/internal/apiserviceref"
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"go.pinniped.dev/internal/config/supervisor"
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"go.pinniped.dev/internal/controller/apicerts"
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"go.pinniped.dev/internal/controller/supervisorconfig"
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"go.pinniped.dev/internal/controller/supervisorconfig/activedirectoryupstreamwatcher"
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"go.pinniped.dev/internal/controller/supervisorconfig/generator"
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"go.pinniped.dev/internal/controller/supervisorconfig/ldapupstreamwatcher"
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"go.pinniped.dev/internal/controller/supervisorconfig/oidcupstreamwatcher"
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"go.pinniped.dev/internal/controller/supervisorstorage"
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"go.pinniped.dev/internal/controllerinit"
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"go.pinniped.dev/internal/controllerlib"
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"go.pinniped.dev/internal/crypto/ptls"
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"go.pinniped.dev/internal/deploymentref"
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"go.pinniped.dev/internal/downward"
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"go.pinniped.dev/internal/dynamiccert"
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"go.pinniped.dev/internal/groupsuffix"
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"go.pinniped.dev/internal/kubeclient"
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"go.pinniped.dev/internal/leaderelection"
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"go.pinniped.dev/internal/oidc/jwks"
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"go.pinniped.dev/internal/oidc/provider"
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"go.pinniped.dev/internal/oidc/provider/manager"
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"go.pinniped.dev/internal/plog"
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"go.pinniped.dev/internal/secret"
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"go.pinniped.dev/internal/supervisor/apiserver"
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supervisorscheme "go.pinniped.dev/internal/supervisor/scheme"
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)
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const (
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singletonWorker = 1
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defaultResyncInterval = 3 * time.Minute
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)
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func startServer(ctx context.Context, shutdown *sync.WaitGroup, l net.Listener, handler http.Handler) {
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handler = genericapifilters.WithWarningRecorder(handler)
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handler = withBootstrapPaths(handler, "/healthz") // only health checks are allowed for bootstrap connections
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server := http.Server{
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Handler: handler,
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ConnContext: withBootstrapConnCtx,
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}
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shutdown.Add(1)
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go func() {
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defer shutdown.Done()
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err := server.Serve(l)
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plog.Debug("server exited", "err", err)
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}()
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shutdown.Add(1)
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go func() {
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defer shutdown.Done()
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<-ctx.Done()
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plog.Debug("server context cancelled", "err", ctx.Err())
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// allow up to a minute grace period for active connections to return to idle
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connectionsCtx, connectionsCancel := context.WithTimeout(context.Background(), time.Minute)
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defer connectionsCancel()
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if err := server.Shutdown(connectionsCtx); err != nil {
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plog.Debug("server shutdown failed", "err", err)
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}
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}()
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}
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func signalCtx() context.Context {
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signalCh := make(chan os.Signal, 1)
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signal.Notify(signalCh, os.Interrupt, syscall.SIGTERM)
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ctx, cancel := context.WithCancel(context.Background())
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go func() {
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defer cancel()
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s := <-signalCh
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plog.Debug("saw signal", "signal", s)
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}()
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return ctx
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}
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//nolint:funlen
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func prepareControllers(
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cfg *supervisor.Config,
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issuerManager *manager.Manager,
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dynamicJWKSProvider jwks.DynamicJWKSProvider,
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dynamicTLSCertProvider provider.DynamicTLSCertProvider,
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dynamicUpstreamIDPProvider provider.DynamicUpstreamIDPProvider,
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dynamicServingCertProvider dynamiccert.Private,
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secretCache *secret.Cache,
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supervisorDeployment *appsv1.Deployment,
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kubeClient kubernetes.Interface,
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pinnipedClient pinnipedclientset.Interface,
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aggregatorClient aggregatorclient.Interface,
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kubeInformers kubeinformers.SharedInformerFactory,
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pinnipedInformers pinnipedinformers.SharedInformerFactory,
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leaderElector controllerinit.RunnerWrapper,
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podInfo *downward.PodInfo,
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) controllerinit.RunnerBuilder {
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const certificateName string = "pinniped-supervisor-api-tls-serving-certificate"
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clientSecretSupervisorGroupData := groupsuffix.SupervisorAggregatedGroups(*cfg.APIGroupSuffix)
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federationDomainInformer := pinnipedInformers.Config().V1alpha1().FederationDomains()
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secretInformer := kubeInformers.Core().V1().Secrets()
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// Create controller manager.
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controllerManager := controllerlib.
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NewManager().
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WithController(
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supervisorstorage.GarbageCollectorController(
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dynamicUpstreamIDPProvider,
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clock.RealClock{},
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kubeClient,
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secretInformer,
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controllerlib.WithInformer,
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),
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singletonWorker,
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).
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WithController(
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supervisorconfig.NewFederationDomainWatcherController(
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issuerManager,
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clock.RealClock{},
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pinnipedClient,
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federationDomainInformer,
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controllerlib.WithInformer,
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),
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singletonWorker,
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).
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WithController(
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supervisorconfig.NewJWKSWriterController(
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cfg.Labels,
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kubeClient,
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pinnipedClient,
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secretInformer,
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federationDomainInformer,
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controllerlib.WithInformer,
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),
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singletonWorker,
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).
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WithController(
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supervisorconfig.NewJWKSObserverController(
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dynamicJWKSProvider,
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secretInformer,
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federationDomainInformer,
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controllerlib.WithInformer,
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),
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singletonWorker,
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).
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WithController(
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supervisorconfig.NewTLSCertObserverController(
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dynamicTLSCertProvider,
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cfg.NamesConfig.DefaultTLSCertificateSecret,
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secretInformer,
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federationDomainInformer,
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controllerlib.WithInformer,
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),
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singletonWorker,
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).
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WithController(
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generator.NewSupervisorSecretsController(
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supervisorDeployment,
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cfg.Labels,
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kubeClient,
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secretInformer,
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func(secret []byte) {
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plog.Debug("setting csrf cookie secret")
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secretCache.SetCSRFCookieEncoderHashKey(secret)
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},
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controllerlib.WithInformer,
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controllerlib.WithInitialEvent,
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),
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singletonWorker,
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).
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WithController(
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generator.NewFederationDomainSecretsController(
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generator.NewSymmetricSecretHelper(
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"pinniped-oidc-provider-hmac-key-",
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cfg.Labels,
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rand.Reader,
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generator.SecretUsageTokenSigningKey,
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func(federationDomainIssuer string, symmetricKey []byte) {
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plog.Debug("setting hmac secret", "issuer", federationDomainIssuer)
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secretCache.SetTokenHMACKey(federationDomainIssuer, symmetricKey)
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},
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),
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func(fd *configv1alpha1.FederationDomainStatus) *corev1.LocalObjectReference {
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return &fd.Secrets.TokenSigningKey
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},
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kubeClient,
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pinnipedClient,
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secretInformer,
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federationDomainInformer,
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controllerlib.WithInformer,
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),
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singletonWorker,
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).
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WithController(
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generator.NewFederationDomainSecretsController(
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generator.NewSymmetricSecretHelper(
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"pinniped-oidc-provider-upstream-state-signature-key-",
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cfg.Labels,
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rand.Reader,
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generator.SecretUsageStateSigningKey,
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func(federationDomainIssuer string, symmetricKey []byte) {
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plog.Debug("setting state signature key", "issuer", federationDomainIssuer)
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secretCache.SetStateEncoderHashKey(federationDomainIssuer, symmetricKey)
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},
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),
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func(fd *configv1alpha1.FederationDomainStatus) *corev1.LocalObjectReference {
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return &fd.Secrets.StateSigningKey
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},
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kubeClient,
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pinnipedClient,
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secretInformer,
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federationDomainInformer,
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controllerlib.WithInformer,
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),
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singletonWorker,
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).
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WithController(
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generator.NewFederationDomainSecretsController(
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generator.NewSymmetricSecretHelper(
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"pinniped-oidc-provider-upstream-state-encryption-key-",
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cfg.Labels,
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rand.Reader,
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generator.SecretUsageStateEncryptionKey,
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func(federationDomainIssuer string, symmetricKey []byte) {
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plog.Debug("setting state encryption key", "issuer", federationDomainIssuer)
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secretCache.SetStateEncoderBlockKey(federationDomainIssuer, symmetricKey)
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},
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),
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func(fd *configv1alpha1.FederationDomainStatus) *corev1.LocalObjectReference {
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return &fd.Secrets.StateEncryptionKey
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},
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kubeClient,
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pinnipedClient,
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secretInformer,
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federationDomainInformer,
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controllerlib.WithInformer,
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),
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singletonWorker,
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).
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WithController(
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oidcupstreamwatcher.New(
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dynamicUpstreamIDPProvider,
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pinnipedClient,
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pinnipedInformers.IDP().V1alpha1().OIDCIdentityProviders(),
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secretInformer,
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plog.Logr(), // nolint: staticcheck // old controller with lots of log statements
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controllerlib.WithInformer,
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),
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singletonWorker).
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WithController(
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ldapupstreamwatcher.New(
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dynamicUpstreamIDPProvider,
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pinnipedClient,
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pinnipedInformers.IDP().V1alpha1().LDAPIdentityProviders(),
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secretInformer,
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controllerlib.WithInformer,
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),
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singletonWorker).
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WithController(
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activedirectoryupstreamwatcher.New(
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dynamicUpstreamIDPProvider,
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pinnipedClient,
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pinnipedInformers.IDP().V1alpha1().ActiveDirectoryIdentityProviders(),
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secretInformer,
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controllerlib.WithInformer,
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),
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singletonWorker).
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WithController(
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apicerts.NewCertsManagerController(
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podInfo.Namespace,
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certificateName,
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cfg.Labels,
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kubeClient,
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secretInformer,
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controllerlib.WithInformer,
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controllerlib.WithInitialEvent,
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365*24*time.Hour, // about one year
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"Pinniped Supervisor Aggregation CA",
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cfg.NamesConfig.APIService,
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),
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singletonWorker,
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).
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WithController(
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apicerts.NewAPIServiceUpdaterController(
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podInfo.Namespace,
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certificateName,
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clientSecretSupervisorGroupData.APIServiceName(),
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aggregatorClient,
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secretInformer,
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controllerlib.WithInformer,
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),
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singletonWorker,
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).
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WithController(
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apicerts.NewCertsObserverController(
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podInfo.Namespace,
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certificateName,
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dynamicServingCertProvider,
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secretInformer,
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controllerlib.WithInformer,
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),
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singletonWorker,
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).
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WithController(
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apicerts.NewCertsExpirerController(
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podInfo.Namespace,
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certificateName,
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kubeClient,
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secretInformer,
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controllerlib.WithInformer,
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9*30*24*time.Hour, // about 9 months
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apicerts.TLSCertificateChainSecretKey,
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plog.New(),
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),
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singletonWorker,
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)
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return controllerinit.Prepare(controllerManager.Start, leaderElector, kubeInformers, pinnipedInformers)
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}
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//nolint:funlen
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func runSupervisor(ctx context.Context, podInfo *downward.PodInfo, cfg *supervisor.Config) error {
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serverInstallationNamespace := podInfo.Namespace
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clientSecretSupervisorGroupData := groupsuffix.SupervisorAggregatedGroups(*cfg.APIGroupSuffix)
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apiServiceRef, err := apiserviceref.New(clientSecretSupervisorGroupData.APIServiceName())
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if err != nil {
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return fmt.Errorf("cannot create API service ref: %w", err)
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}
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dref, supervisorDeployment, supervisorPod, err := deploymentref.New(podInfo)
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if err != nil {
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return fmt.Errorf("cannot create deployment ref: %w", err)
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}
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opts := []kubeclient.Option{
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dref,
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apiServiceRef,
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kubeclient.WithMiddleware(groupsuffix.New(*cfg.APIGroupSuffix)),
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}
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client, leaderElector, err := leaderelection.New(
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podInfo,
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supervisorDeployment,
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opts...,
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)
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if err != nil {
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return fmt.Errorf("cannot create k8s client: %w", err)
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}
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clientWithoutLeaderElection, err := kubeclient.New(opts...)
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if err != nil {
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return fmt.Errorf("cannot create k8s client without leader election: %w", err)
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}
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kubeInformers := kubeinformers.NewSharedInformerFactoryWithOptions(
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client.Kubernetes,
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defaultResyncInterval,
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kubeinformers.WithNamespace(serverInstallationNamespace),
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)
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pinnipedInformers := pinnipedinformers.NewSharedInformerFactoryWithOptions(
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client.PinnipedSupervisor,
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defaultResyncInterval,
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pinnipedinformers.WithNamespace(serverInstallationNamespace),
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)
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// Serve the /healthz endpoint and make all other paths result in 404.
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healthMux := http.NewServeMux()
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healthMux.Handle("/healthz", http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
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_, _ = writer.Write([]byte("ok"))
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}))
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dynamicServingCertProvider := dynamiccert.NewServingCert("supervisor-serving-cert")
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dynamicJWKSProvider := jwks.NewDynamicJWKSProvider()
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dynamicTLSCertProvider := provider.NewDynamicTLSCertProvider()
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dynamicUpstreamIDPProvider := provider.NewDynamicUpstreamIDPProvider()
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secretCache := secret.Cache{}
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// OIDC endpoints will be served by the oidProvidersManager, and any non-OIDC paths will fallback to the healthMux.
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oidProvidersManager := manager.NewManager(
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healthMux,
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dynamicJWKSProvider,
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dynamicUpstreamIDPProvider,
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&secretCache,
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clientWithoutLeaderElection.Kubernetes.CoreV1().Secrets(serverInstallationNamespace), // writes to kube storage are allowed for non-leaders
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)
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// Get the "real" name of the client secret supervisor API group (i.e., the API group name with the
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// injected suffix).
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scheme, clientSecretGV := supervisorscheme.New(*cfg.APIGroupSuffix)
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buildControllersFunc := prepareControllers(
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cfg,
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oidProvidersManager,
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dynamicJWKSProvider,
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dynamicTLSCertProvider,
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dynamicUpstreamIDPProvider,
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dynamicServingCertProvider,
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&secretCache,
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supervisorDeployment,
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client.Kubernetes,
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client.PinnipedSupervisor,
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client.Aggregation,
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kubeInformers,
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pinnipedInformers,
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leaderElector,
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podInfo,
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)
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shutdown := &sync.WaitGroup{}
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// Get the aggregated API server config.
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aggregatedAPIServerConfig, err := getAggregatedAPIServerConfig(
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dynamicServingCertProvider,
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buildControllersFunc,
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*cfg.APIGroupSuffix,
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*cfg.AggregatedAPIServerPort,
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scheme,
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clientSecretGV,
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)
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if err != nil {
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return fmt.Errorf("could not configure aggregated API server: %w", err)
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}
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// Complete the aggregated API server config and make a server instance.
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server, err := aggregatedAPIServerConfig.Complete().New()
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if err != nil {
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return fmt.Errorf("could not create aggregated API server: %w", err)
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}
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if e := cfg.Endpoints.HTTP; e.Network != supervisor.NetworkDisabled {
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finishSetupPerms := maybeSetupUnixPerms(e, supervisorPod)
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httpListener, err := net.Listen(e.Network, e.Address)
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if err != nil {
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return fmt.Errorf("cannot create http listener with network %q and address %q: %w", e.Network, e.Address, err)
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}
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if err := finishSetupPerms(); err != nil {
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return fmt.Errorf("cannot setup http listener permissions for network %q and address %q: %w", e.Network, e.Address, err)
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}
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defer func() { _ = httpListener.Close() }()
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startServer(ctx, shutdown, httpListener, oidProvidersManager)
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plog.Debug("supervisor http listener started", "address", httpListener.Addr().String())
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}
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if e := cfg.Endpoints.HTTPS; e.Network != supervisor.NetworkDisabled { //nolint:nestif
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finishSetupPerms := maybeSetupUnixPerms(e, supervisorPod)
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bootstrapCert, err := getBootstrapCert() // generate this in-memory once per process startup
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if err != nil {
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return fmt.Errorf("https listener bootstrap error: %w", err)
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}
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c := ptls.Default(nil)
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c.GetCertificate = func(info *tls.ClientHelloInfo) (*tls.Certificate, error) {
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cert := dynamicTLSCertProvider.GetTLSCert(strings.ToLower(info.ServerName))
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defaultCert := dynamicTLSCertProvider.GetDefaultTLSCert()
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|
|
if plog.Enabled(plog.LevelTrace) { // minor CPU optimization as this is generally just noise
|
|
host, port, _ := net.SplitHostPort(info.Conn.LocalAddr().String()) // error is safe to ignore here
|
|
|
|
plog.Trace("GetCertificate called",
|
|
"info.ServerName", info.ServerName,
|
|
"foundSNICert", cert != nil,
|
|
"foundDefaultCert", defaultCert != nil,
|
|
"host", host,
|
|
"port", port,
|
|
)
|
|
}
|
|
|
|
if cert == nil {
|
|
cert = defaultCert
|
|
}
|
|
|
|
if cert == nil {
|
|
setIsBootstrapConn(info.Context()) // make this connection only work for bootstrap requests
|
|
cert = bootstrapCert
|
|
}
|
|
|
|
return cert, nil
|
|
}
|
|
|
|
httpsListener, err := tls.Listen(e.Network, e.Address, c)
|
|
if err != nil {
|
|
return fmt.Errorf("cannot create https listener with network %q and address %q: %w", e.Network, e.Address, err)
|
|
}
|
|
|
|
if err := finishSetupPerms(); err != nil {
|
|
return fmt.Errorf("cannot setup https listener permissions for network %q and address %q: %w", e.Network, e.Address, err)
|
|
}
|
|
|
|
defer func() { _ = httpsListener.Close() }()
|
|
startServer(ctx, shutdown, httpsListener, oidProvidersManager)
|
|
plog.Debug("supervisor https listener started", "address", httpsListener.Addr().String())
|
|
}
|
|
|
|
plog.Debug("supervisor started")
|
|
defer plog.Debug("supervisor exiting")
|
|
|
|
// Run the server. Its post-start hook will start the controllers.
|
|
err = server.GenericAPIServer.PrepareRun().Run(ctx.Done())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
shutdown.Wait()
|
|
|
|
return nil
|
|
}
|
|
|
|
// Create a configuration for the aggregated API server.
|
|
func getAggregatedAPIServerConfig(
|
|
dynamicCertProvider dynamiccert.Private,
|
|
buildControllers controllerinit.RunnerBuilder,
|
|
apiGroupSuffix string,
|
|
aggregatedAPIServerPort int64,
|
|
scheme *runtime.Scheme,
|
|
clientSecretSupervisorGroupVersion schema.GroupVersion,
|
|
) (*apiserver.Config, error) {
|
|
codecs := serializer.NewCodecFactory(scheme)
|
|
|
|
// this is unused for now but it is a safe value that we could use in the future
|
|
defaultEtcdPathPrefix := fmt.Sprintf("/pinniped-supervisor-registry/%s", apiGroupSuffix)
|
|
|
|
recommendedOptions := genericoptions.NewRecommendedOptions(
|
|
defaultEtcdPathPrefix,
|
|
codecs.LegacyCodec(clientSecretSupervisorGroupVersion),
|
|
)
|
|
recommendedOptions.Etcd = nil // turn off etcd storage because we don't need it yet
|
|
recommendedOptions.SecureServing.ServerCert.GeneratedCert = dynamicCertProvider
|
|
|
|
// This port is configurable. It should be safe to cast because the config reader already validated it.
|
|
recommendedOptions.SecureServing.BindPort = int(aggregatedAPIServerPort)
|
|
|
|
// secure TLS for connections coming from and going to the Kube API server
|
|
// this is best effort because not all options provide the right hooks to override TLS config
|
|
// since our only client is the Kube API server, this uses the most secure TLS config
|
|
if err := ptls.SecureRecommendedOptions(recommendedOptions, kubeclient.Secure); err != nil {
|
|
return nil, fmt.Errorf("failed to secure recommended options: %w", err)
|
|
}
|
|
|
|
serverConfig := genericapiserver.NewRecommendedConfig(codecs)
|
|
// Note that among other things, this ApplyTo() function copies
|
|
// `recommendedOptions.SecureServing.ServerCert.GeneratedCert` into
|
|
// `serverConfig.SecureServing.Cert` thus making `dynamicCertProvider`
|
|
// the cert provider for the running server. The provider will be called
|
|
// by the API machinery periodically. When the provider returns nil certs,
|
|
// the API server will return "the server is currently unable to
|
|
// handle the request" error responses for all incoming requests.
|
|
// If the provider later starts returning certs, then the API server
|
|
// will use them to handle the incoming requests successfully.
|
|
if err := recommendedOptions.ApplyTo(serverConfig); err != nil {
|
|
return nil, fmt.Errorf("failed to apply recommended options: %w", err)
|
|
}
|
|
|
|
apiServerConfig := &apiserver.Config{
|
|
GenericConfig: serverConfig,
|
|
ExtraConfig: apiserver.ExtraConfig{
|
|
BuildControllersPostStartHook: buildControllers,
|
|
Scheme: scheme,
|
|
NegotiatedSerializer: codecs,
|
|
ClientSecretSupervisorGroupVersion: clientSecretSupervisorGroupVersion,
|
|
},
|
|
}
|
|
return apiServerConfig, nil
|
|
}
|
|
|
|
func maybeSetupUnixPerms(endpoint *supervisor.Endpoint, pod *corev1.Pod) func() error {
|
|
if endpoint.Network != supervisor.NetworkUnix {
|
|
return func() error { return nil }
|
|
}
|
|
|
|
_ = os.Remove(endpoint.Address) // empty dir volumes persist across container crashes
|
|
|
|
return func() error {
|
|
selfUser := int64(os.Getuid())
|
|
var entries []acl.Entry
|
|
for _, container := range pod.Spec.Containers {
|
|
if container.SecurityContext == nil ||
|
|
container.SecurityContext.RunAsUser == nil ||
|
|
*container.SecurityContext.RunAsUser == selfUser {
|
|
continue
|
|
}
|
|
|
|
plog.Debug("adding write permission",
|
|
"address", endpoint.Address,
|
|
"uid", *container.SecurityContext.RunAsUser,
|
|
)
|
|
entries = append(entries, acl.Entry{
|
|
Tag: acl.TagUser,
|
|
Qualifier: strconv.FormatInt(*container.SecurityContext.RunAsUser, 10),
|
|
Perms: 2, // write permission
|
|
})
|
|
}
|
|
return acl.Add(endpoint.Address, entries...) // allow all containers in the pod to write to the socket
|
|
}
|
|
}
|
|
|
|
func main() error { // return an error instead of plog.Fatal to allow defer statements to run
|
|
defer plog.Setup()()
|
|
|
|
plog.Always("Running supervisor",
|
|
"user-agent", rest.DefaultKubernetesUserAgent(),
|
|
"version", versionInfo(version.Get()),
|
|
"arguments", os.Args,
|
|
)
|
|
|
|
// Discover in which namespace we are installed.
|
|
podInfo, err := downward.Load(os.Args[1])
|
|
if err != nil {
|
|
return fmt.Errorf("could not read pod metadata: %w", err)
|
|
}
|
|
|
|
ctx := signalCtx()
|
|
|
|
// Read the server config file.
|
|
cfg, err := supervisor.FromPath(ctx, os.Args[2])
|
|
if err != nil {
|
|
return fmt.Errorf("could not load config: %w", err)
|
|
}
|
|
|
|
return runSupervisor(ctx, podInfo, cfg)
|
|
}
|
|
|
|
func Main() {
|
|
if err := main(); err != nil {
|
|
plog.Fatal(err)
|
|
}
|
|
}
|
|
|
|
type versionInfo apimachineryversion.Info // hide .String() method from plog
|