constellation/cli/internal/cmd/verify.go
katexochen 7bbcc564bb Refactor id file interaction
* Use IP instead of endpoint in clusterIDsFile
* Move and rename validateEnpoint to addPortIfMissing
* Refactor clusterIDsFile handling in verify cmd
2022-08-23 18:11:20 +02:00

228 lines
6.6 KiB
Go

package cmd
import (
"bytes"
"context"
"errors"
"fmt"
"net"
"strconv"
"strings"
"github.com/edgelesssys/constellation/cli/internal/cloudcmd"
"github.com/edgelesssys/constellation/internal/atls"
"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/grpc/dialer"
"github.com/edgelesssys/constellation/verify/verifyproto"
"github.com/spf13/afero"
"github.com/spf13/cobra"
"google.golang.org/grpc"
)
// NewVerifyCmd returns a new cobra.Command for the verify command.
func NewVerifyCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "verify {aws|azure|gcp}",
Short: "Verify the confidential properties of a Constellation cluster",
Long: `Verify the confidential properties of a Constellation cluster.
If arguments aren't specified, values are read from ` + "`" + constants.ClusterIDsFileName + "`.",
Args: cobra.MatchAll(
cobra.ExactArgs(1),
isCloudProvider(0),
warnAWS(0),
),
RunE: runVerify,
}
cmd.Flags().String("owner-id", "", "verify using the owner identity derived from the master secret")
cmd.Flags().String("cluster-id", "", "verify using Constellation's cluster identifier")
cmd.Flags().StringP("node-endpoint", "e", "", "endpoint of the node to verify, passed as HOST[:PORT]")
return cmd
}
func runVerify(cmd *cobra.Command, args []string) error {
provider := cloudprovider.FromString(args[0])
fileHandler := file.NewHandler(afero.NewOsFs())
verifyClient := &constellationVerifier{dialer: dialer.New(nil, nil, &net.Dialer{})}
return verify(cmd, provider, fileHandler, verifyClient)
}
func verify(
cmd *cobra.Command, provider cloudprovider.Provider, fileHandler file.Handler, verifyClient verifyClient,
) error {
flags, err := parseVerifyFlags(cmd, fileHandler)
if err != nil {
return err
}
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
}
if err := validators.UpdateInitPCRs(flags.ownerID, flags.clusterID); err != nil {
return err
}
nonce, err := crypto.GenerateRandomBytes(32)
if err != nil {
return err
}
userData, err := crypto.GenerateRandomBytes(32)
if err != nil {
return err
}
if err := verifyClient.Verify(
cmd.Context(),
flags.endpoint,
&verifyproto.GetAttestationRequest{
Nonce: nonce,
UserData: userData,
},
validators.V(cmd),
); err != nil {
return err
}
cmd.Println("OK")
return nil
}
func parseVerifyFlags(cmd *cobra.Command, fileHandler file.Handler) (verifyFlags, error) {
configPath, err := cmd.Flags().GetString("config")
if err != nil {
return verifyFlags{}, fmt.Errorf("parsing config path argument: %w", err)
}
ownerID, err := cmd.Flags().GetString("owner-id")
if err != nil {
return verifyFlags{}, fmt.Errorf("parsing owner-id argument: %w", err)
}
clusterID, err := cmd.Flags().GetString("cluster-id")
if err != nil {
return verifyFlags{}, fmt.Errorf("parsing cluster-id argument: %w", err)
}
endpoint, err := cmd.Flags().GetString("node-endpoint")
if err != nil {
return verifyFlags{}, fmt.Errorf("parsing node-endpoint argument: %w", err)
}
emptyEndpoint := endpoint == ""
emptyIDs := ownerID == "" && clusterID == ""
var idFile clusterIDsFile
if emptyEndpoint || emptyIDs { // Get empty values from ID file
if err := fileHandler.ReadJSON(constants.ClusterIDsFileName, &idFile); err != nil {
return verifyFlags{}, fmt.Errorf("reading cluster ID file: %w", err)
}
}
if emptyEndpoint {
cmd.Printf("Using endpoint from %q. Specify --node-endpoint to override this.\n", constants.ClusterIDsFileName)
endpoint = idFile.IP
}
if emptyIDs {
cmd.Printf("Using IDs from %q. Specify --owner-id and/or --cluster-id to override this.\n", constants.ClusterIDsFileName)
ownerID = idFile.OwnerID
clusterID = idFile.ClusterID
}
// Validate
if ownerID == "" && clusterID == "" {
return verifyFlags{}, errors.New("neither owner-id nor cluster-id provided to verify the cluster")
}
endpoint, err = addPortIfMissing(endpoint, constants.VerifyServiceNodePortGRPC)
if err != nil {
return verifyFlags{}, fmt.Errorf("validating endpoint argument: %w", err)
}
return verifyFlags{
endpoint: endpoint,
configPath: configPath,
ownerID: ownerID,
clusterID: clusterID,
}, nil
}
type verifyFlags struct {
endpoint string
ownerID string
clusterID string
configPath string
}
func addPortIfMissing(endpoint string, defaultPort int) (string, error) {
if endpoint == "" {
return "", errors.New("endpoint is empty")
}
_, _, err := net.SplitHostPort(endpoint)
if err == nil {
return endpoint, nil
}
if strings.Contains(err.Error(), "missing port in address") {
return net.JoinHostPort(endpoint, strconv.Itoa(defaultPort)), nil
}
return "", err
}
// verifyCompletion handles the completion of CLI arguments. It is frequently called
// while the user types arguments of the command to suggest completion.
func verifyCompletion(_ *cobra.Command, args []string, _ string) ([]string, cobra.ShellCompDirective) {
switch len(args) {
case 0:
return []string{"gcp", "azure"}, cobra.ShellCompDirectiveNoFileComp
default:
return []string{}, cobra.ShellCompDirectiveError
}
}
type constellationVerifier struct {
dialer grpcInsecureDialer
}
// Verify retrieves an attestation statement from the Constellation and verifies it using the validator.
func (v *constellationVerifier) Verify(
ctx context.Context, endpoint string, req *verifyproto.GetAttestationRequest, validator atls.Validator,
) error {
conn, err := v.dialer.DialInsecure(ctx, endpoint)
if err != nil {
return fmt.Errorf("dialing init server: %w", err)
}
defer conn.Close()
client := verifyproto.NewAPIClient(conn)
resp, err := client.GetAttestation(ctx, req)
if err != nil {
return fmt.Errorf("getting attestation: %w", err)
}
signedData, err := validator.Validate(resp.Attestation, req.Nonce)
if err != nil {
return fmt.Errorf("validating attestation: %w", err)
}
if !bytes.Equal(signedData, req.UserData) {
return errors.New("signed data in attestation does not match provided user data")
}
return nil
}
type verifyClient interface {
Verify(ctx context.Context, endpoint string, req *verifyproto.GetAttestationRequest, validator atls.Validator) error
}
type grpcInsecureDialer interface {
DialInsecure(ctx context.Context, endpoint string) (conn *grpc.ClientConn, err error)
}