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crypto: replace ToECDSAPub with error-checking func UnmarshalPubkey (#16932) 

ToECDSAPub was unsafe because it returned a non-nil key with nil X, Y in
case of invalid input. This change replaces ToECDSAPub with
UnmarshalPubkey across the codebase.
This commit is contained in:
Felix Lange 2018-06-12 15:26:08 +02:00 committed by Guillaume Ballet
parent 85cd64df0e
commit 0255951587
9 changed files with 62 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
cmd/wnode/main.go
View File

@ -140,8 +140,8 @@ func processArgs() {
}
if *asymmetricMode && len(*argPub) > 0 {
pub = crypto.ToECDSAPub(common.FromHex(*argPub))
if !isKeyValid(pub) {
var err error
if pub, err = crypto.UnmarshalPubkey(common.FromHex(*argPub)); err != nil {
utils.Fatalf("invalid public key")
}
}
@ -321,10 +321,6 @@ func startServer() error {
return nil
}
func isKeyValid(k *ecdsa.PublicKey) bool {
return k.X != nil && k.Y != nil
}
func configureNode() {
var err error
var p2pAccept bool
@ -340,9 +336,8 @@ func configureNode() {
if b == nil {
utils.Fatalf("Error: can not convert hexadecimal string")
}
pub = crypto.ToECDSAPub(b)
if !isKeyValid(pub) {
utils.Fatalf("Error: invalid public key")
if pub, err = crypto.UnmarshalPubkey(b); err != nil {
utils.Fatalf("Error: invalid peer public key")
}
}
}

13
crypto/crypto.go
View File

@ -39,6 +39,8 @@ var (
secp256k1halfN = new(big.Int).Div(secp256k1N, big.NewInt(2))
)
var errInvalidPubkey = errors.New("invalid secp256k1 public key")
// Keccak256 calculates and returns the Keccak256 hash of the input data.
func Keccak256(data ...[]byte) []byte {
d := sha3.NewKeccak256()
@ -122,12 +124,13 @@ func FromECDSA(priv *ecdsa.PrivateKey) []byte {
return math.PaddedBigBytes(priv.D, priv.Params().BitSize/8)
}
func ToECDSAPub(pub []byte) *ecdsa.PublicKey {
if len(pub) == 0 {
return nil
}
// UnmarshalPubkey converts bytes to a secp256k1 public key.
func UnmarshalPubkey(pub []byte) (*ecdsa.PublicKey, error) {
x, y := elliptic.Unmarshal(S256(), pub)
return &ecdsa.PublicKey{Curve: S256(), X: x, Y: y}
if x == nil {
return nil, errInvalidPubkey
}
return &ecdsa.PublicKey{Curve: S256(), X: x, Y: y}, nil
}
func FromECDSAPub(pub *ecdsa.PublicKey) []byte {

31
crypto/crypto_test.go
View File

@ -23,9 +23,11 @@ import (
"io/ioutil"
"math/big"
"os"
"reflect"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
)
var testAddrHex = "970e8128ab834e8eac17ab8e3812f010678cf791"
@ -56,6 +58,33 @@ func BenchmarkSha3(b *testing.B) {
}
}
func TestUnmarshalPubkey(t *testing.T) {
key, err := UnmarshalPubkey(nil)
if err != errInvalidPubkey || key != nil {
t.Fatalf("expected error, got %v, %v", err, key)
}
key, err = UnmarshalPubkey([]byte{1, 2, 3})
if err != errInvalidPubkey || key != nil {
t.Fatalf("expected error, got %v, %v", err, key)
}
var (
enc, _ = hex.DecodeString("04760c4460e5336ac9bbd87952a3c7ec4363fc0a97bd31c86430806e287b437fd1b01abc6e1db640cf3106b520344af1d58b00b57823db3e1407cbc433e1b6d04d")
dec = &ecdsa.PublicKey{
Curve: S256(),
X: hexutil.MustDecodeBig("0x760c4460e5336ac9bbd87952a3c7ec4363fc0a97bd31c86430806e287b437fd1"),
Y: hexutil.MustDecodeBig("0xb01abc6e1db640cf3106b520344af1d58b00b57823db3e1407cbc433e1b6d04d"),
}
)
key, err = UnmarshalPubkey(enc)
if err != nil {
t.Fatalf("expected no error, got %v", err)
}
if !reflect.DeepEqual(key, dec) {
t.Fatal("wrong result")
}
}
func TestSign(t *testing.T) {
key, _ := HexToECDSA(testPrivHex)
addr := common.HexToAddress(testAddrHex)
@ -69,7 +98,7 @@ func TestSign(t *testing.T) {
if err != nil {
t.Errorf("ECRecover error: %s", err)
}
pubKey := ToECDSAPub(recoveredPub)
pubKey, _ := UnmarshalPubkey(recoveredPub)
recoveredAddr := PubkeyToAddress(*pubKey)
if addr != recoveredAddr {
t.Errorf("Address mismatch: want: %x have: %x", addr, recoveredAddr)

6
internal/ethapi/api.go
View File

@ -461,13 +461,11 @@ func (s *PrivateAccountAPI) EcRecover(ctx context.Context, data, sig hexutil.Byt
}
sig[64] -= 27 // Transform yellow paper V from 27/28 to 0/1
rpk, err := crypto.Ecrecover(signHash(data), sig)
rpk, err := crypto.SigToPub(signHash(data), sig)
if err != nil {
return common.Address{}, err
}
pubKey := crypto.ToECDSAPub(rpk)
recoveredAddr := crypto.PubkeyToAddress(*pubKey)
return recoveredAddr, nil
return crypto.PubkeyToAddress(*rpk), nil
}
// SignAndSendTransaction was renamed to SendTransaction. This method is deprecated

6
p2p/rlpx.go
View File

@ -528,9 +528,9 @@ func importPublicKey(pubKey []byte) (*ecies.PublicKey, error) {
return nil, fmt.Errorf("invalid public key length %v (expect 64/65)", len(pubKey))
}
// TODO: fewer pointless conversions
pub := crypto.ToECDSAPub(pubKey65)
if pub.X == nil {
return nil, fmt.Errorf("invalid public key")
pub, err := crypto.UnmarshalPubkey(pubKey65)
if err != nil {
return nil, err
}
return ecies.ImportECDSAPublic(pub), nil
}

6
signer/core/api.go
View File

@ -432,13 +432,11 @@ func (api *SignerAPI) EcRecover(ctx context.Context, data, sig hexutil.Bytes) (c
}
sig[64] -= 27 // Transform yellow paper V from 27/28 to 0/1
hash, _ := SignHash(data)
rpk, err := crypto.Ecrecover(hash, sig)
rpk, err := crypto.SigToPub(hash, sig)
if err != nil {
return common.Address{}, err
}
pubKey := crypto.ToECDSAPub(rpk)
recoveredAddr := crypto.PubkeyToAddress(*pubKey)
return recoveredAddr, nil
return crypto.PubkeyToAddress(*rpk), nil
}
// SignHash is a helper function that calculates a hash for the given message that can be

8
swarm/services/swap/swap.go
View File

@ -19,6 +19,7 @@ package swap
import (
"context"
"crypto/ecdsa"
"errors"
"fmt"
"math/big"
"os"
@ -134,6 +135,11 @@ func NewSwap(local *SwapParams, remote *SwapProfile, backend chequebook.Backend,
out *chequebook.Outbox
)
remotekey, err := crypto.UnmarshalPubkey(common.FromHex(remote.PublicKey))
if err != nil {
return nil, errors.New("invalid remote public key")
}
// check if remote chequebook is valid
// insolvent chequebooks suicide so will signal as invalid
// TODO: monitoring a chequebooks events
@ -142,7 +148,7 @@ func NewSwap(local *SwapParams, remote *SwapProfile, backend chequebook.Backend,
log.Info(fmt.Sprintf("invalid contract %v for peer %v: %v)", remote.Contract.Hex()[:8], proto, err))
} else {
// remote contract valid, create inbox
in, err = chequebook.NewInbox(local.privateKey, remote.Contract, local.Beneficiary, crypto.ToECDSAPub(common.FromHex(remote.PublicKey)), backend)
in, err = chequebook.NewInbox(local.privateKey, remote.Contract, local.Beneficiary, remotekey, backend)
if err != nil {
log.Warn(fmt.Sprintf("unable to set up inbox for chequebook contract %v for peer %v: %v)", remote.Contract.Hex()[:8], proto, err))
}

9
whisper/whisperv5/api.go
View File

@ -252,8 +252,7 @@ func (api *PublicWhisperAPI) Post(ctx context.Context, req NewMessage) (bool, er
// Set asymmetric key that is used to encrypt the message
if pubKeyGiven {
params.Dst = crypto.ToECDSAPub(req.PublicKey)
if !ValidatePublicKey(params.Dst) {
if params.Dst, err = crypto.UnmarshalPubkey(req.PublicKey); err != nil {
return false, ErrInvalidPublicKey
}
}
@ -329,8 +328,7 @@ func (api *PublicWhisperAPI) Messages(ctx context.Context, crit Criteria) (*rpc.
}
if len(crit.Sig) > 0 {
filter.Src = crypto.ToECDSAPub(crit.Sig)
if !ValidatePublicKey(filter.Src) {
if filter.Src, err = crypto.UnmarshalPubkey(crit.Sig); err != nil {
return nil, ErrInvalidSigningPubKey
}
}
@ -513,8 +511,7 @@ func (api *PublicWhisperAPI) NewMessageFilter(req Criteria) (string, error) {
}
if len(req.Sig) > 0 {
src = crypto.ToECDSAPub(req.Sig)
if !ValidatePublicKey(src) {
if src, err = crypto.UnmarshalPubkey(req.Sig); err != nil {
return "", ErrInvalidSigningPubKey
}
}

9
whisper/whisperv6/api.go
View File

@ -272,8 +272,7 @@ func (api *PublicWhisperAPI) Post(ctx context.Context, req NewMessage) (hexutil.
// Set asymmetric key that is used to encrypt the message
if pubKeyGiven {
params.Dst = crypto.ToECDSAPub(req.PublicKey)
if !ValidatePublicKey(params.Dst) {
if params.Dst, err = crypto.UnmarshalPubkey(req.PublicKey); err != nil {
return nil, ErrInvalidPublicKey
}
}
@ -360,8 +359,7 @@ func (api *PublicWhisperAPI) Messages(ctx context.Context, crit Criteria) (*rpc.
}
if len(crit.Sig) > 0 {
filter.Src = crypto.ToECDSAPub(crit.Sig)
if !ValidatePublicKey(filter.Src) {
if filter.Src, err = crypto.UnmarshalPubkey(crit.Sig); err != nil {
return nil, ErrInvalidSigningPubKey
}
}
@ -544,8 +542,7 @@ func (api *PublicWhisperAPI) NewMessageFilter(req Criteria) (string, error) {
}
if len(req.Sig) > 0 {
src = crypto.ToECDSAPub(req.Sig)
if !ValidatePublicKey(src) {
if src, err = crypto.UnmarshalPubkey(req.Sig); err != nil {
return "", ErrInvalidSigningPubKey
}
}