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verify payout & dispute payout tx fees are within range of recreated tx

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This commit is contained in:
woodser 2023-01-15 17:29:19 -05:00
parent 9260cf53ee
commit a49611a234
5 changed files with 48 additions and 16 deletions
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1
core/src/main/java/bisq/core/btc/wallet/TradeWalletService.java
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@ -698,6 +698,7 @@ public class TradeWalletService {
* @throws TransactionVerificationException if there was an unexpected problem with the payout tx or its signatures
* @throws WalletException if the seller's wallet is null or structurally inconsistent
*/
@Deprecated
public Transaction sellerSignsAndFinalizesPayoutTx(Transaction depositTx,
byte[] buyerSignature,
Coin buyerPayoutAmount,

18
core/src/main/java/bisq/core/support/dispute/DisputeManager.java
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@ -701,7 +701,7 @@ public abstract class DisputeManager<T extends DisputeList<Dispute>> extends Sup
if (trade == null) throw new RuntimeException("Dispute trade " + dispute.getTradeId() + " does not exist");
// create dispute payout tx if not given
if (payoutTx == null) payoutTx = createDisputePayoutTx(trade, dispute, disputeResult); // can be null if already published or we don't have receiver's multisig hex
if (payoutTx == null) payoutTx = createDisputePayoutTx(trade, dispute, disputeResult, false); // can be null if already published or we don't have receiver's multisig hex
// persist result in dispute's chat message
ChatMessage chatMessage = new ChatMessage(
@ -804,7 +804,7 @@ public abstract class DisputeManager<T extends DisputeList<Dispute>> extends Sup
// Utils
///////////////////////////////////////////////////////////////////////////////////////////
public MoneroTxWallet createDisputePayoutTx(Trade trade, Dispute dispute, DisputeResult disputeResult) {
public MoneroTxWallet createDisputePayoutTx(Trade trade, Dispute dispute, DisputeResult disputeResult, boolean skipMultisigImport) {
// sync and save wallet
trade.syncWallet();
@ -813,14 +813,16 @@ public abstract class DisputeManager<T extends DisputeList<Dispute>> extends Sup
// create unsigned dispute payout tx if not already published and arbitrator has trader's updated multisig info
TradingPeer receiver = trade.getTradingPeer(dispute.getTraderPubKeyRing());
if (!trade.isPayoutPublished() && receiver.getUpdatedMultisigHex() != null) {
MoneroWallet multisigWallet = trade.getWallet();
// import multisig hex
MoneroWallet multisigWallet = trade.getWallet();
List<String> updatedMultisigHexes = new ArrayList<String>();
if (trade.getBuyer().getUpdatedMultisigHex() != null) updatedMultisigHexes.add(trade.getBuyer().getUpdatedMultisigHex());
if (trade.getSeller().getUpdatedMultisigHex() != null) updatedMultisigHexes.add(trade.getSeller().getUpdatedMultisigHex());
if (!updatedMultisigHexes.isEmpty()) {
multisigWallet.importMultisigHex(updatedMultisigHexes.toArray(new String[0])); // TODO (monero-project): fails if multisig hex imported individually
if (!skipMultisigImport) {
List<String> updatedMultisigHexes = new ArrayList<String>();
if (trade.getBuyer().getUpdatedMultisigHex() != null) updatedMultisigHexes.add(trade.getBuyer().getUpdatedMultisigHex());
if (trade.getSeller().getUpdatedMultisigHex() != null) updatedMultisigHexes.add(trade.getSeller().getUpdatedMultisigHex());
if (!updatedMultisigHexes.isEmpty()) {
multisigWallet.importMultisigHex(updatedMultisigHexes.toArray(new String[0])); // TODO (monero-project): fails if multisig hex imported individually
}
}
// sync and save wallet

17
core/src/main/java/bisq/core/support/dispute/arbitration/ArbitrationManager.java
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@ -329,8 +329,6 @@ public final class ArbitrationManager extends DisputeManager<ArbitrationDisputeL
BigInteger destinationSum = (buyerPayoutDestination == null ? BigInteger.ZERO : buyerPayoutDestination.getAmount()).add(sellerPayoutDestination == null ? BigInteger.ZERO : sellerPayoutDestination.getAmount());
if (!arbitratorSignedPayoutTx.getOutputSum().equals(destinationSum.add(arbitratorSignedPayoutTx.getChangeAmount()))) throw new RuntimeException("Sum of outputs != destination amounts + change amount");
// TODO: verify miner fee is within expected range
// verify winner and loser payout amounts
BigInteger txCost = arbitratorSignedPayoutTx.getFee().add(arbitratorSignedPayoutTx.getChangeAmount()); // fee + lost dust change
BigInteger expectedWinnerAmount = HavenoUtils.coinToAtomicUnits(disputeResult.getWinner() == Winner.BUYER ? disputeResult.getBuyerPayoutAmount() : disputeResult.getSellerPayoutAmount());
@ -348,6 +346,21 @@ public final class ArbitrationManager extends DisputeManager<ArbitrationDisputeL
String signedMultisigTxHex = result.getSignedMultisigTxHex();
signedTxSet.setMultisigTxHex(signedMultisigTxHex);
// verify mining fee is within tolerance by recreating payout tx
// TODO (monero-project): creating tx will require exchanging updated multisig hex if message needs reprocessed. provide weight with describe_transfer so fee can be estimated?
MoneroTxWallet feeEstimateTx = null;
try {
feeEstimateTx = createDisputePayoutTx(trade, dispute, disputeResult, true);
} catch (Exception e) {
log.warn("Could not recreate dispute payout tx to verify fee: " + e.getMessage());
}
if (feeEstimateTx != null) {
BigInteger feeEstimate = feeEstimateTx.getFee();
double feeDiff = arbitratorSignedPayoutTx.getFee().subtract(feeEstimate).abs().doubleValue() / feeEstimate.doubleValue(); // TODO: use BigDecimal?
if (feeDiff > XmrWalletService.MINER_FEE_TOLERANCE) throw new RuntimeException("Miner fee is not within " + (XmrWalletService.MINER_FEE_TOLERANCE * 100) + "% of estimated fee, expected " + feeEstimate + " but was " + arbitratorSignedPayoutTx.getFee());
log.info("Payout tx fee {} is within tolerance, diff %={}", arbitratorSignedPayoutTx.getFee(), feeDiff);
}
// submit fully signed payout tx to the network
List<String> txHashes = multisigWallet.submitMultisigTxHex(signedTxSet.getMultisigTxHex());
signedTxSet.getTxs().get(0).setHash(txHashes.get(0)); // manually update hash which is known after signed

26
core/src/main/java/bisq/core/trade/Trade.java
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@ -716,7 +716,6 @@ public abstract class Trade implements Tradable, Model {
BigInteger sellerPayoutAmount = sellerDepositAmount.subtract(tradeAmount);
// create transaction to get fee estimate
if (multisigWallet.isMultisigImportNeeded()) throw new RuntimeException("Cannot create payout tx because multisig import is needed");
MoneroTxWallet feeEstimateTx = multisigWallet.createTx(new MoneroTxConfig()
.setAccountIndex(0)
.addDestination(buyerPayoutAddress, buyerPayoutAmount.multiply(BigInteger.valueOf(9)).divide(BigInteger.valueOf(10))) // reduce payment amount to compute fee of similar tx
@ -798,17 +797,34 @@ public abstract class Trade implements Tradable, Model {
BigInteger expectedSellerPayout = sellerDepositAmount.subtract(tradeAmount).subtract(txCost.divide(BigInteger.valueOf(2)));
if (!sellerPayoutDestination.getAmount().equals(expectedSellerPayout)) throw new RuntimeException("Seller destination amount is not deposit amount - trade amount - 1/2 tx costs, " + sellerPayoutDestination.getAmount() + " vs " + expectedSellerPayout);
// TODO (woodser): verify fee is reasonable (e.g. within 2x of fee estimate tx)
// sign payout tx
// handle tx signing
if (sign) {
// sign tx
MoneroMultisigSignResult result = multisigWallet.signMultisigTxHex(payoutTxHex);
if (result.getSignedMultisigTxHex() == null) throw new RuntimeException("Error signing payout tx");
payoutTxHex = result.getSignedMultisigTxHex();
describedTxSet = multisigWallet.describeMultisigTxSet(payoutTxHex); // update described set
payoutTx = describedTxSet.getTxs().get(0);
// verify fee is within tolerance by recreating payout tx
// TODO (monero-project): creating tx will require exchanging updated multisig hex if message needs reprocessed. provide weight with describe_transfer so fee can be estimated?
MoneroTxWallet feeEstimateTx = null;
try {
feeEstimateTx = createPayoutTx();
} catch (Exception e) {
log.warn("Could not recreate payout tx to verify fee: " + e.getMessage());
}
if (feeEstimateTx != null) {
BigInteger feeEstimate = feeEstimateTx.getFee();
double feeDiff = payoutTx.getFee().subtract(feeEstimate).abs().doubleValue() / feeEstimate.doubleValue(); // TODO: use BigDecimal?
if (feeDiff > XmrWalletService.MINER_FEE_TOLERANCE) throw new RuntimeException("Miner fee is not within " + (XmrWalletService.MINER_FEE_TOLERANCE * 100) + "% of estimated fee, expected " + feeEstimate + " but was " + payoutTx.getFee());
log.info("Payout tx fee {} is within tolerance, diff %={}", payoutTx.getFee(), feeDiff);
}
}
// update trade state
setPayoutTx(describedTxSet.getTxs().get(0));
setPayoutTx(payoutTx);
setPayoutTxHex(payoutTxHex);
// submit payout tx

2
desktop/src/main/java/bisq/desktop/main/overlays/windows/DisputeSummaryWindow.java
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@ -583,7 +583,7 @@ public class DisputeSummaryWindow extends Overlay<DisputeSummaryWindow> {
closeTicketButton.setOnAction(e -> {
// create payout tx
MoneroTxWallet payoutTx = arbitrationManager.createDisputePayoutTx(trade, dispute, disputeResult);
MoneroTxWallet payoutTx = arbitrationManager.createDisputePayoutTx(trade, dispute, disputeResult, false);
// show confirmation
if (dispute.getSupportType() == SupportType.ARBITRATION &&