constellation/cli/internal/cmd/verify.go
Fabian Kammel 81a5907f26
consistently use stdout and stderr (#502)
* consistently use stdout and stderr
Signed-off-by: Fabian Kammel <fk@edgeless.systems>
2022-11-10 10:27:24 +01:00

217 lines
5.9 KiB
Go

/*
Copyright (c) Edgeless Systems GmbH
SPDX-License-Identifier: AGPL-3.0-only
*/
package cmd
import (
"bytes"
"context"
"errors"
"fmt"
"io/fs"
"net"
"strconv"
"strings"
"github.com/edgelesssys/constellation/v2/cli/internal/cloudcmd"
"github.com/edgelesssys/constellation/v2/cli/internal/clusterid"
"github.com/edgelesssys/constellation/v2/internal/atls"
"github.com/edgelesssys/constellation/v2/internal/constants"
"github.com/edgelesssys/constellation/v2/internal/crypto"
"github.com/edgelesssys/constellation/v2/internal/file"
"github.com/edgelesssys/constellation/v2/internal/grpc/dialer"
"github.com/edgelesssys/constellation/v2/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",
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(0),
),
RunE: runVerify,
}
cmd.Flags().String("cluster-id", "", "expected 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 {
fileHandler := file.NewHandler(afero.NewOsFs())
verifyClient := &constellationVerifier{dialer: dialer.New(nil, nil, &net.Dialer{})}
return verify(cmd, fileHandler, verifyClient)
}
func verify(cmd *cobra.Command, fileHandler file.Handler, verifyClient verifyClient) error {
flags, err := parseVerifyFlags(cmd, fileHandler)
if err != nil {
return err
}
config, err := readConfig(cmd.ErrOrStderr(), fileHandler, flags.configPath)
if err != nil {
return fmt.Errorf("reading and validating config: %w", err)
}
provider := config.GetProvider()
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 := ""
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)
}
// Get empty values from ID file
emptyEndpoint := endpoint == ""
emptyIDs := ownerID == "" && clusterID == ""
if emptyEndpoint || emptyIDs {
var idFile clusterid.File
if err := fileHandler.ReadJSON(constants.ClusterIDsFileName, &idFile); err == nil {
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 ID from %q. Specify --cluster-id to override this.\n", constants.ClusterIDsFileName)
ownerID = idFile.OwnerID
clusterID = idFile.ClusterID
}
} else if !errors.Is(err, fs.ErrNotExist) {
return verifyFlags{}, fmt.Errorf("reading cluster ID file: %w", err)
}
}
// Validate
if ownerID == "" && clusterID == "" {
return verifyFlags{}, errors.New("cluster-id not 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
}
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)
}