constellation/cli/internal/cmd/recover.go
Daniel Weiße 8f5f84deb5 AB#2305 Fix missing atls verifier in init call (#352)
Signed-off-by: Daniel Weiße <dw@edgeless.systems>
2022-08-09 14:04:40 +02:00

147 lines
4.6 KiB
Go

package cmd
import (
"errors"
"fmt"
"regexp"
"strings"
"github.com/edgelesssys/constellation/cli/internal/cloudcmd"
"github.com/edgelesssys/constellation/cli/internal/proto"
"github.com/edgelesssys/constellation/internal/attestation"
"github.com/edgelesssys/constellation/internal/cloud/cloudprovider"
"github.com/edgelesssys/constellation/internal/constants"
"github.com/edgelesssys/constellation/internal/crypto"
"github.com/edgelesssys/constellation/internal/file"
"github.com/edgelesssys/constellation/internal/state"
"github.com/spf13/afero"
"github.com/spf13/cobra"
)
var diskUUIDRegexp = regexp.MustCompile("^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$")
// NewRecoverCmd returns a new cobra.Command for the recover command.
func NewRecoverCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "recover",
Short: "Recover a completely stopped Constellation cluster",
Long: "Recover a Constellation cluster by sending a recovery key to an instance in the boot stage." +
"\nThis is only required if instances restart without other instances available for bootstrapping.",
Args: cobra.ExactArgs(0),
RunE: runRecover,
}
cmd.Flags().StringP("endpoint", "e", "", "endpoint of the instance, passed as HOST[:PORT] (required)")
must(cmd.MarkFlagRequired("endpoint"))
cmd.Flags().String("disk-uuid", "", "disk UUID of the encrypted state disk (required)")
must(cmd.MarkFlagRequired("disk-uuid"))
cmd.Flags().String("master-secret", constants.MasterSecretFilename, "path to master secret file")
return cmd
}
func runRecover(cmd *cobra.Command, _ []string) error {
fileHandler := file.NewHandler(afero.NewOsFs())
recoveryClient := &proto.KeyClient{}
defer recoveryClient.Close()
return recover(cmd, fileHandler, recoveryClient)
}
func recover(cmd *cobra.Command, fileHandler file.Handler, recoveryClient recoveryClient) error {
flags, err := parseRecoverFlags(cmd)
if err != nil {
return err
}
var masterSecret masterSecret
if err := fileHandler.ReadJSON(flags.secretPath, &masterSecret); err != nil {
return err
}
var stat state.ConstellationState
if err := fileHandler.ReadJSON(constants.StateFilename, &stat); err != nil {
return err
}
provider := cloudprovider.FromString(stat.CloudProvider)
config, err := readConfig(cmd.OutOrStdout(), fileHandler, flags.configPath, provider)
if err != nil {
return fmt.Errorf("reading and validating config: %w", err)
}
validators, err := cloudcmd.NewValidator(provider, config)
if err != nil {
return err
}
cmd.Print(validators.WarningsIncludeInit())
if err := recoveryClient.Connect(flags.endpoint, validators.V()); err != nil {
return err
}
diskKey, err := deriveStateDiskKey(masterSecret.Key, masterSecret.Salt, flags.diskUUID)
if err != nil {
return err
}
measurementSecret, err := attestation.DeriveMeasurementSecret(masterSecret.Key, masterSecret.Salt)
if err != nil {
return err
}
if err := recoveryClient.PushStateDiskKey(cmd.Context(), diskKey, measurementSecret); err != nil {
return err
}
cmd.Println("Pushed recovery key.")
return nil
}
func parseRecoverFlags(cmd *cobra.Command) (recoverFlags, error) {
endpoint, err := cmd.Flags().GetString("endpoint")
if err != nil {
return recoverFlags{}, fmt.Errorf("parsing endpoint argument: %w", err)
}
endpoint, err = validateEndpoint(endpoint, constants.BootstrapperPort)
if err != nil {
return recoverFlags{}, fmt.Errorf("validating endpoint argument: %w", err)
}
diskUUID, err := cmd.Flags().GetString("disk-uuid")
if err != nil {
return recoverFlags{}, fmt.Errorf("parsing disk-uuid argument: %w", err)
}
if match := diskUUIDRegexp.MatchString(diskUUID); !match {
return recoverFlags{}, errors.New("flag '--disk-uuid' isn't a valid LUKS UUID")
}
diskUUID = strings.ToLower(diskUUID)
masterSecretPath, err := cmd.Flags().GetString("master-secret")
if err != nil {
return recoverFlags{}, fmt.Errorf("parsing master-secret path argument: %w", err)
}
configPath, err := cmd.Flags().GetString("config")
if err != nil {
return recoverFlags{}, fmt.Errorf("parsing config path argument: %w", err)
}
return recoverFlags{
endpoint: endpoint,
diskUUID: diskUUID,
secretPath: masterSecretPath,
configPath: configPath,
}, nil
}
type recoverFlags struct {
endpoint string
diskUUID string
secretPath string
configPath string
}
// deriveStateDiskKey derives a state disk key from a master key, a salt, and a disk UUID.
func deriveStateDiskKey(masterKey, salt []byte, diskUUID string) ([]byte, error) {
return crypto.DeriveKey(masterKey, salt, []byte(crypto.HKDFInfoPrefix+diskUUID), crypto.StateDiskKeyLength)
}