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run.go
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run.go
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package cmd
import (
"bytes"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"os"
"reflect"
"github.com/gorilla/websocket"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"github.com/spf13/cobra"
sentinelEntities "github.com/capeprivacy/sentinel/entities"
"github.com/capeprivacy/sentinel/runner"
"github.com/capeprivacy/cli/attest"
"github.com/capeprivacy/cli/crypto"
)
// runCmd represents the run command
var runCmd = &cobra.Command{
Use: "run function_id [input data]",
Short: "Run a deployed function with data",
Long: "Run a deployed function with data, takes function id, path to data, and (optional) function hash.\n" +
"Run will also read input data from stdin, example: \"echo '1234' | cape run id\".\n" +
"Results are output to stdout so you can easily pipe them elsewhere.",
RunE: func(cmd *cobra.Command, args []string) error {
err := run(cmd, args)
if _, ok := err.(UserError); !ok {
cmd.SilenceUsage = true
}
return err
},
}
type RunResponse struct {
Type string `json:"type"`
Message []byte `json:"message"`
}
type AttestationResponse struct {
AttestationDoc string `json:"attestation_doc"`
}
type Message struct {
Type string `json:"type"`
Message []byte `json:"message"`
}
type ErrorRunResponse struct {
Message string `json:"message"`
}
func init() {
rootCmd.AddCommand(runCmd)
runCmd.PersistentFlags().StringP("token", "t", "", "token to use")
runCmd.PersistentFlags().StringP("file", "f", "", "input data file")
runCmd.PersistentFlags().StringP("function-hash", "", "", "function hash to attest")
runCmd.PersistentFlags().StringP("key-policy-hash", "", "", "key policy hash to attest")
runCmd.PersistentFlags().StringSliceP("pcr", "p", []string{""}, "pass multiple PCRs to validate against")
}
func run(cmd *cobra.Command, args []string) error {
u := C.EnclaveHost
insecure := C.Insecure
if len(args) < 1 {
return UserError{Msg: "you must pass a function ID", Err: fmt.Errorf("invalid number of input arguments")}
}
functionID := args[0]
var input []byte
file, err := cmd.Flags().GetString("file")
if err != nil {
return UserError{Msg: "error retrieving file flag", Err: err}
}
funcHashArg, err := cmd.Flags().GetString("function-hash")
if err != nil {
return UserError{Msg: "error retrieving function_hash flag", Err: err}
}
pcrSlice, err := cmd.Flags().GetStringSlice("pcr")
if err != nil {
return UserError{Msg: "error retrieving pcr flags", Err: err}
}
funcHash, err := hex.DecodeString(funcHashArg)
if err != nil {
return UserError{Msg: "error reading function hash", Err: err}
}
keyPolicyHashArg, err := cmd.Flags().GetString("key-policy-hash")
if err != nil {
return UserError{Msg: "error retrieving key_policy_hash flag", Err: err}
}
keyPolicyHash, err := hex.DecodeString(keyPolicyHashArg)
if err != nil {
return UserError{Msg: "error reading key policy hash", Err: err}
}
switch {
case file != "":
// input file was provided
input, err = os.ReadFile(file)
if err != nil {
return UserError{Msg: "unable to read data file", Err: err}
}
case len(args) == 2:
// read input from command line string
input = []byte(args[1])
default:
// read input from stdin
buf := new(bytes.Buffer)
if _, err := io.Copy(buf, cmd.InOrStdin()); err != nil {
return UserError{Msg: "unable to read data from stdin", Err: err}
}
input = buf.Bytes()
}
results, err := doRun(u, functionID, input, insecure, funcHash, keyPolicyHash, pcrSlice)
if err != nil {
return fmt.Errorf("error processing data: %w", err)
}
fmt.Println(string(results))
return nil
}
// This function is exported for tuner to use.
func Run(url string, functionID string, file string, insecure bool) ([]byte, error) {
input, err := os.ReadFile(file)
if err != nil {
return nil, fmt.Errorf("unable to read data file: %w", err)
}
// TODO: Tuner may want to verify function hash later.
res, err := doRun(url, functionID, input, insecure, nil, nil, []string{})
if err != nil {
return nil, fmt.Errorf("error processing data: %w", err)
}
return res, nil
}
func doRun(url string, functionID string, data []byte, insecure bool, funcHash []byte, keyPolicyHash []byte, pcrSlice []string) ([]byte, error) {
endpoint := fmt.Sprintf("%s/v1/run/%s", url, functionID)
token, err := getAuthToken()
if err != nil {
return nil, err
}
c, res, err := websocketDial(endpoint, insecure, token)
if err != nil {
log.Error("error dialing websocket: ", err)
// This check is necessary because we don't necessarily return an http response from sentinel.
// Http error code and message is returned if network routing fails.
if res != nil {
var e ErrorMsg
if err := json.NewDecoder(res.Body).Decode(&e); err != nil {
return nil, err
}
res.Body.Close()
return nil, fmt.Errorf("error code: %d, reason: %s", res.StatusCode, e.Error)
}
return nil, err
}
defer c.Close()
nonce, err := crypto.GetNonce()
if err != nil {
return nil, err
}
p := runner.Protocol{Websocket: c}
req := sentinelEntities.StartRequest{Nonce: []byte(nonce), AuthToken: token}
log.Debug("\n> Sending Nonce and Auth Token")
err = p.WriteStart(req)
if err != nil {
return nil, errors.Wrap(err, "error writing run request")
}
log.Debug("* Waiting for attestation document...")
attestDoc, err := p.ReadAttestationDoc()
if err != nil {
log.Println("error reading attestation doc")
return nil, err
}
log.Debug("< Downloading AWS Root Certificate")
rootCert, err := attest.GetRootAWSCert()
if err != nil {
return nil, err
}
log.Debug("< Auth Completed. Received Attestation Document")
doc, userData, err := attest.Attest(attestDoc, rootCert)
if err != nil {
log.Println("error attesting")
return nil, err
}
if userData.FuncHash == nil && len(funcHash) > 0 {
return nil, fmt.Errorf("did not receive function hash from enclave")
}
// If function hash as an optional parameter has not been specified by the user, then we don't check the value.
if len(funcHash) > 0 && !reflect.DeepEqual(funcHash, userData.FuncHash) {
return nil, fmt.Errorf("returned function hash did not match provided, got: %x, want %x", userData.FuncHash, funcHash)
}
if userData.KeyPolicyHash == nil && len(keyPolicyHash) > 0 {
return nil, fmt.Errorf("did not receive key policy hash from enclave")
}
if len(keyPolicyHash) > 0 && !reflect.DeepEqual(keyPolicyHash, userData.KeyPolicyHash) {
return nil, fmt.Errorf("returned key policy hash did not match provided, got: %x, want %x", userData.KeyPolicyHash, keyPolicyHash)
}
encryptedData, err := crypto.LocalEncrypt(*doc, data)
if err != nil {
log.Println("error encrypting")
return nil, err
}
log.Debug("\n> Sending Encrypted Inputs")
err = writeData(c, encryptedData)
if err != nil {
return nil, err
}
log.Debug("* Waiting for function results...")
resData, err := p.ReadRunResults()
if err != nil {
return nil, err
}
log.Debugf("< Received Function Results.")
return resData.Message, nil
}
func writeData(conn *websocket.Conn, data []byte) error {
w, err := conn.NextWriter(websocket.BinaryMessage)
if err != nil {
return err
}
defer w.Close()
_, err = w.Write(data)
if err != nil {
return err
}
return nil
}