loopout: use psbt when obtaining the MuSig2 signature

In this commit we deprecate the sighash field from the
MuSig2SignSweepReq request in favour of using a psbt serialized sweep
transaction instead. This way the sever gains full transparency about
client sweep requests and can assemble the sighash to sign on its own.
pull/509/head swapserverrpc/v1.0.3
Andras Banki-Horvath 2 years ago
parent e80852f9ba
commit f8da106338
No known key found for this signature in database
GPG Key ID: 80E5375C094198D8

@ -1353,7 +1353,7 @@ func (s *loopOutSwap) createMuSig2SweepTxn(
// First assemble our taproot keyspend sweep transaction and get the
// sig hash.
sweepTx, sigHash, err := s.sweeper.CreateUnsignedTaprootKeySpendSweepTx(
sweepTx, sweepTxPsbt, sigHash, err := s.sweeper.CreateUnsignedTaprootKeySpendSweepTx(
ctx, uint32(s.height), s.htlc, htlcOutpoint, htlcValue, fee,
s.DestAddr,
)
@ -1387,7 +1387,7 @@ func (s *loopOutSwap) createMuSig2SweepTxn(
serverNonce, serverSig, err := s.swapKit.server.MuSig2SignSweep(
ctx, s.SwapContract.ProtocolVersion, s.hash,
s.swapInvoicePaymentAddr, musig2SessionInfo.PublicNonce[:],
sigHash,
sweepTxPsbt,
)
if err != nil {
return nil, err

@ -256,7 +256,8 @@ func (s *serverMock) ReportRoutingResult(_ context.Context, _ lntypes.Hash,
}
func (s *serverMock) MuSig2SignSweep(_ context.Context, _ loopdb.ProtocolVersion,
_ lntypes.Hash, _ [32]byte, _ []byte, _ []byte) ([]byte, []byte, error) {
_ lntypes.Hash, _ [32]byte, _ []byte, _ []byte) ([]byte,
[]byte, error) {
return nil, nil, nil
}

@ -126,7 +126,7 @@ type swapServerClient interface {
// htlc spend. Returns the server's nonce and partial signature.
MuSig2SignSweep(ctx context.Context,
protocolVersion loopdb.ProtocolVersion, swapHash lntypes.Hash,
paymentAddr [32]byte, nonce []byte, sigHash []byte) (
paymentAddr [32]byte, nonce []byte, sweepTxPsbt []byte) (
[]byte, []byte, error)
}
@ -731,7 +731,7 @@ func (s *grpcSwapServerClient) ReportRoutingResult(ctx context.Context,
// spend. Returns the server's nonce and partial signature.
func (s *grpcSwapServerClient) MuSig2SignSweep(ctx context.Context,
protocolVersion loopdb.ProtocolVersion, swapHash lntypes.Hash,
paymentAddr [32]byte, nonce []byte, sigHash []byte) (
paymentAddr [32]byte, nonce []byte, sweepTxPsbt []byte) (
[]byte, []byte, error) {
req := &looprpc.MuSig2SignSweepReq{
@ -739,7 +739,7 @@ func (s *grpcSwapServerClient) MuSig2SignSweep(ctx context.Context,
SwapHash: swapHash[:],
PaymentAddress: paymentAddr[:],
Nonce: nonce,
SigHash: sigHash,
SweepTxPsbt: sweepTxPsbt,
}
rpcCtx, rpcCancel := context.WithTimeout(ctx, globalCallTimeout)

@ -2276,8 +2276,8 @@ type MuSig2SignSweepReq struct {
PaymentAddress []byte `protobuf:"bytes,3,opt,name=payment_address,json=paymentAddress,proto3" json:"payment_address,omitempty"`
// The local public nonce.
Nonce []byte `protobuf:"bytes,4,opt,name=nonce,proto3" json:"nonce,omitempty"`
// The sighash of the htlc sweep.
SigHash []byte `protobuf:"bytes,5,opt,name=sig_hash,json=sigHash,proto3" json:"sig_hash,omitempty"`
// The psbt of the sweep txn.
SweepTxPsbt []byte `protobuf:"bytes,6,opt,name=sweep_tx_psbt,json=sweepTxPsbt,proto3" json:"sweep_tx_psbt,omitempty"`
}
func (x *MuSig2SignSweepReq) Reset() {
@ -2340,9 +2340,9 @@ func (x *MuSig2SignSweepReq) GetNonce() []byte {
return nil
}
func (x *MuSig2SignSweepReq) GetSigHash() []byte {
func (x *MuSig2SignSweepReq) GetSweepTxPsbt() []byte {
if x != nil {
return x.SigHash
return x.SweepTxPsbt
}
return nil
}
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}
var (

@ -530,6 +530,8 @@ message ReportRoutingResultRes {
}
message MuSig2SignSweepReq {
reserved 5;
ProtocolVersion protocol_version = 1;
// The swap hash.
@ -542,8 +544,8 @@ message MuSig2SignSweepReq {
// The local public nonce.
bytes nonce = 4;
// The sighash of the htlc sweep.
bytes sig_hash = 5;
// The psbt of the sweep txn.
bytes sweep_tx_psbt = 6;
}
message MuSig2SignSweepRes {

@ -1,11 +1,13 @@
package sweep
import (
"bytes"
"context"
"fmt"
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/btcutil"
"github.com/btcsuite/btcd/btcutil/psbt"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcd/wire"
"github.com/lightninglabs/lndclient"
@ -20,51 +22,57 @@ type Sweeper struct {
}
// CreateUnsignedTaprootKeySpendSweepTx creates a taproot htlc sweep tx using
// keyspend. Returns the raw unsigned txn and the sighash or an error.
// keyspend. Returns the raw unsigned txn, the psbt serialized txn, the sighash
// or an error.
func (s *Sweeper) CreateUnsignedTaprootKeySpendSweepTx(
ctx context.Context, lockTime uint32,
htlc *swap.Htlc, htlcOutpoint wire.OutPoint,
amount, fee btcutil.Amount, destAddr btcutil.Address) (
*wire.MsgTx, []byte, error) {
*wire.MsgTx, []byte, []byte, error) {
if htlc.Version != swap.HtlcV3 {
return nil, nil, fmt.Errorf("invalid htlc version")
return nil, nil, nil, fmt.Errorf("invalid htlc version")
}
// Compose tx.
sweepTx := wire.NewMsgTx(2)
sweepTx.LockTime = lockTime
// Add HTLC input.
sweepTx.AddTxIn(&wire.TxIn{
PreviousOutPoint: htlcOutpoint,
SignatureScript: htlc.SigScript,
})
// Add output for the destination address.
sweepPkScript, err := txscript.PayToAddrScript(destAddr)
if err != nil {
return nil, nil, err
return nil, nil, nil, err
}
sweepTx.AddTxOut(&wire.TxOut{
PkScript: sweepPkScript,
Value: int64(amount - fee),
})
// Compose tx.
sweepTx := &wire.MsgTx{
Version: 2,
TxIn: []*wire.TxIn{{
PreviousOutPoint: htlcOutpoint,
}},
TxOut: []*wire.TxOut{{
Value: int64(amount - fee),
PkScript: sweepPkScript,
}},
LockTime: lockTime,
}
// We need our previous outputs for taproot spends, and there's no
// harm including them for segwit v0, so we always include our prevOut.
prevOut := []*wire.TxOut{
{
Value: int64(amount),
PkScript: htlc.PkScript,
},
packet, err := psbt.NewFromUnsignedTx(sweepTx)
if err != nil {
return nil, nil, nil, err
}
packet.Inputs[0].WitnessUtxo = &wire.TxOut{
Value: int64(amount),
PkScript: htlc.PkScript,
}
var psbtBuf bytes.Buffer
err = packet.Serialize(&psbtBuf)
if err != nil {
return nil, nil, nil, err
}
// We now need to create the raw sighash of the transaction, as that
// will be the message we're signing collaboratively.
// We now need to create the raw sighash of the transaction, as we'll
// use it to create the witness for our htlc sweep.
prevOutputFetcher := txscript.NewCannedPrevOutputFetcher(
prevOut[0].PkScript, prevOut[0].Value,
htlc.PkScript, int64(amount),
)
sigHashes := txscript.NewTxSigHashes(sweepTx, prevOutputFetcher)
@ -73,10 +81,10 @@ func (s *Sweeper) CreateUnsignedTaprootKeySpendSweepTx(
prevOutputFetcher,
)
if err != nil {
return nil, nil, err
return nil, nil, nil, err
}
return sweepTx, taprootSigHash, nil
return sweepTx, psbtBuf.Bytes(), taprootSigHash, nil
}
// CreateSweepTx creates an htlc sweep tx.

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