mirror of
https://github.com/edgelesssys/constellation.git
synced 2024-10-01 01:36:09 -04:00
251 lines
7.4 KiB
Go
251 lines
7.4 KiB
Go
/*
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Copyright (c) Edgeless Systems GmbH
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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package cmd
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"net"
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"sync"
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"time"
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"github.com/edgelesssys/constellation/v2/cli/internal/cloudcmd"
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"github.com/edgelesssys/constellation/v2/cli/internal/state"
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"github.com/edgelesssys/constellation/v2/disk-mapper/recoverproto"
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"github.com/edgelesssys/constellation/v2/internal/api/attestationconfigapi"
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"github.com/edgelesssys/constellation/v2/internal/atls"
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"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
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"github.com/edgelesssys/constellation/v2/internal/config"
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"github.com/edgelesssys/constellation/v2/internal/constants"
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"github.com/edgelesssys/constellation/v2/internal/file"
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"github.com/edgelesssys/constellation/v2/internal/grpc/dialer"
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grpcRetry "github.com/edgelesssys/constellation/v2/internal/grpc/retry"
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"github.com/edgelesssys/constellation/v2/internal/kms/uri"
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"github.com/edgelesssys/constellation/v2/internal/retry"
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"github.com/spf13/afero"
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"github.com/spf13/cobra"
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"github.com/spf13/pflag"
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)
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// NewRecoverCmd returns a new cobra.Command for the recover command.
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func NewRecoverCmd() *cobra.Command {
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cmd := &cobra.Command{
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Use: "recover",
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Short: "Recover a completely stopped Constellation cluster",
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Long: "Recover a Constellation cluster by sending a recovery key to an instance in the boot stage.\n\n" +
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"This is only required if instances restart without other instances available for bootstrapping.",
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Args: cobra.ExactArgs(0),
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RunE: runRecover,
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}
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cmd.Flags().StringP("endpoint", "e", "", "endpoint of the instance, passed as HOST[:PORT]")
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return cmd
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}
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type recoverFlags struct {
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rootFlags
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endpoint string
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}
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func (f *recoverFlags) parse(flags *pflag.FlagSet) error {
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if err := f.rootFlags.parse(flags); err != nil {
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return err
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}
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endpoint, err := flags.GetString("endpoint")
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if err != nil {
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return fmt.Errorf("getting 'endpoint' flag: %w", err)
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}
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f.endpoint = endpoint
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return nil
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}
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type recoverCmd struct {
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log debugLog
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configFetcher attestationconfigapi.Fetcher
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flags recoverFlags
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}
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func runRecover(cmd *cobra.Command, _ []string) error {
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log, err := newCLILogger(cmd)
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if err != nil {
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return fmt.Errorf("creating logger: %w", err)
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}
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defer log.Sync()
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fileHandler := file.NewHandler(afero.NewOsFs())
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newDialer := func(validator atls.Validator) *dialer.Dialer {
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return dialer.New(nil, validator, &net.Dialer{})
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}
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r := &recoverCmd{log: log, configFetcher: attestationconfigapi.NewFetcher()}
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if err := r.flags.parse(cmd.Flags()); err != nil {
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return err
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}
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r.log.Debugf("Using flags: %+v", r.flags)
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return r.recover(cmd, fileHandler, 5*time.Second, &recoverDoer{log: r.log}, newDialer)
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}
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func (r *recoverCmd) recover(
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cmd *cobra.Command, fileHandler file.Handler, interval time.Duration,
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doer recoverDoerInterface, newDialer func(validator atls.Validator) *dialer.Dialer,
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) error {
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var masterSecret uri.MasterSecret
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r.log.Debugf("Loading master secret file from %s", r.flags.pathPrefixer.PrefixPrintablePath(constants.MasterSecretFilename))
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if err := fileHandler.ReadJSON(constants.MasterSecretFilename, &masterSecret); err != nil {
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return err
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}
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r.log.Debugf("Loading configuration file from %q", r.flags.pathPrefixer.PrefixPrintablePath(constants.ConfigFilename))
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conf, err := config.New(fileHandler, constants.ConfigFilename, r.configFetcher, r.flags.force)
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var configValidationErr *config.ValidationError
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if errors.As(err, &configValidationErr) {
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cmd.PrintErrln(configValidationErr.LongMessage())
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}
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if err != nil {
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return err
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}
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provider := conf.GetProvider()
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r.log.Debugf("Got provider %s", provider.String())
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if provider == cloudprovider.Azure {
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interval = 20 * time.Second // Azure LB takes a while to remove unhealthy instances
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}
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stateFile, err := state.ReadFromFile(fileHandler, constants.StateFilename)
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if err != nil {
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return fmt.Errorf("reading state file: %w", err)
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}
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endpoint, err := r.parseEndpoint(stateFile)
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if err != nil {
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return err
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}
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if stateFile.Infrastructure.Azure != nil {
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conf.UpdateMAAURL(stateFile.Infrastructure.Azure.AttestationURL)
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}
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r.log.Debugf("Creating aTLS Validator for %s", conf.GetAttestationConfig().GetVariant())
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validator, err := cloudcmd.NewValidator(cmd, conf.GetAttestationConfig(), r.log)
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if err != nil {
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return fmt.Errorf("creating new validator: %w", err)
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}
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r.log.Debugf("Created a new validator")
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doer.setDialer(newDialer(validator), endpoint)
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r.log.Debugf("Set dialer for endpoint %s", endpoint)
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doer.setURIs(masterSecret.EncodeToURI(), uri.NoStoreURI)
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r.log.Debugf("Set secrets")
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if err := r.recoverCall(cmd.Context(), cmd.OutOrStdout(), interval, doer); err != nil {
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if grpcRetry.ServiceIsUnavailable(err) {
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return nil
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}
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return fmt.Errorf("recovering cluster: %w", err)
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}
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return nil
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}
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func (r *recoverCmd) recoverCall(ctx context.Context, out io.Writer, interval time.Duration, doer recoverDoerInterface) error {
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var err error
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ctr := 0
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for {
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once := sync.Once{}
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retryOnceOnFailure := func(err error) bool {
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var retry bool
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// retry transient GCP LB errors
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if grpcRetry.LoadbalancerIsNotReady(err) {
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retry = true
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} else {
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// retry connection errors once
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// this is necessary because Azure's LB takes a while to remove unhealthy instances
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once.Do(func() {
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retry = grpcRetry.ServiceIsUnavailable(err)
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})
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}
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r.log.Debugf("Encountered error (retriable: %t): %s", retry, err)
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return retry
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}
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retrier := retry.NewIntervalRetrier(doer, interval, retryOnceOnFailure)
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r.log.Debugf("Created new interval retrier")
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err = retrier.Do(ctx)
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if err != nil {
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break
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}
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fmt.Fprintln(out, "Pushed recovery key.")
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ctr++
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}
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r.log.Debugf("Retry counter is %d", ctr)
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if ctr > 0 {
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fmt.Fprintf(out, "Recovered %d control-plane nodes.\n", ctr)
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} else if grpcRetry.ServiceIsUnavailable(err) {
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fmt.Fprintln(out, "No control-plane nodes in need of recovery found. Exiting.")
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return nil
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}
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return err
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}
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func (r *recoverCmd) parseEndpoint(state *state.State) (string, error) {
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endpoint := r.flags.endpoint
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if endpoint == "" {
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endpoint = state.Infrastructure.ClusterEndpoint
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}
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endpoint, err := addPortIfMissing(endpoint, constants.RecoveryPort)
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if err != nil {
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return "", fmt.Errorf("validating cluster endpoint: %w", err)
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}
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return endpoint, nil
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}
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type recoverDoerInterface interface {
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Do(ctx context.Context) error
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setDialer(dialer grpcDialer, endpoint string)
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setURIs(kmsURI, storageURI string)
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}
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type recoverDoer struct {
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dialer grpcDialer
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endpoint string
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kmsURI string // encodes masterSecret
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storageURI string
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log debugLog
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}
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// Do performs the recover streaming rpc.
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func (d *recoverDoer) Do(ctx context.Context) (retErr error) {
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conn, err := d.dialer.Dial(ctx, d.endpoint)
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if err != nil {
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return fmt.Errorf("dialing recovery server: %w", err)
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}
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d.log.Debugf("Dialed recovery server")
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defer conn.Close()
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protoClient := recoverproto.NewAPIClient(conn)
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d.log.Debugf("Created protoClient")
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req := &recoverproto.RecoverMessage{
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KmsUri: d.kmsURI,
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StorageUri: d.storageURI,
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}
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_, err = protoClient.Recover(ctx, req)
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if err != nil {
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return fmt.Errorf("calling recover: %w", err)
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}
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d.log.Debugf("Received confirmation")
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return nil
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}
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func (d *recoverDoer) setDialer(dialer grpcDialer, endpoint string) {
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d.dialer = dialer
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d.endpoint = endpoint
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}
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func (d *recoverDoer) setURIs(kmsURI, storageURI string) {
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d.kmsURI = kmsURI
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d.storageURI = storageURI
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}
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