From 5fcff908f90a0ddc3832cb05d7ad014e1c107436 Mon Sep 17 00:00:00 2001 From: Oliver Gugger Date: Fri, 13 Dec 2024 13:33:28 +0100 Subject: [PATCH] rpcserver+taprpc: reject small invoice payments With this commit we reject the payment of small invoices by using assets, if the total amount of sending 1 asset unit plus the protocol-dictated 354 satoshi for a non-dust HTLC is higher than the total invoice amount attempting to be paid. The user can override this decision with a new flag if they wish to proceed with the uneconomical payment. --- rpcserver.go | 75 ++++++++- taprpc/tapchannelrpc/tapchannel.pb.go | 152 ++++++++++--------- taprpc/tapchannelrpc/tapchannel.proto | 8 + taprpc/tapchannelrpc/tapchannel.swagger.json | 4 + 4 files changed, 170 insertions(+), 69 deletions(-) diff --git a/rpcserver.go b/rpcserver.go index f8d8ce46f..3408aa65c 100644 --- a/rpcserver.go +++ b/rpcserver.go @@ -7074,8 +7074,24 @@ func (r *rpcServer) SendPayment(req *tchrpc.SendPaymentRequest, // amount based on the asset-to-BTC conversion rate. sellOrder := taprpc.MarshalAcceptedSellQuote(*quote) + // paymentMaxAmt is the maximum amount that the counterparty is + // expected to pay. This is the amount that the invoice is + // asking for plus the fee limit in milli-satoshis. + paymentMaxAmt, _, err := r.parseRequest(pReq) + if err != nil { + return err + } + + // Check if the payment requires overpayment based on the quote. + err = checkOverpayment( + sellOrder, paymentMaxAmt, req.AllowOverpay, + ) + if err != nil { + return err + } + // Send out the information about the quote on the stream. - err := stream.Send(&tchrpc.SendPaymentResponse{ + err = stream.Send(&tchrpc.SendPaymentResponse{ Result: &tchrpc.SendPaymentResponse_AcceptedSellOrder{ AcceptedSellOrder: sellOrder, }, @@ -7177,6 +7193,14 @@ func (r *rpcServer) SendPayment(req *tchrpc.SendPaymentRequest, return fmt.Errorf("unexpected response type: %T", r) } + // Check if the payment requires overpayment based on the quote. + err = checkOverpayment( + acceptedQuote, paymentMaxAmt, req.AllowOverpay, + ) + if err != nil { + return err + } + // Send out the information about the quote on the stream. err = stream.Send(&tchrpc.SendPaymentResponse{ Result: &tchrpc.SendPaymentResponse_AcceptedSellOrder{ @@ -7320,6 +7344,55 @@ func (r *rpcServer) parseRequest( return paymentMaxAmt, expiry, nil } +// checkOverpayment checks if paying a certain invoice amount requires +// overpayment when using assets to pay, given the rate from the accepted quote +// and the minimum non-dust HTLC amount dictated by the protocol. +func checkOverpayment(quote *rfqrpc.PeerAcceptedSellQuote, + paymentAmount lnwire.MilliSatoshi, allowOverpay bool) error { + + rateFP, err := rfqrpc.UnmarshalFixedPoint(quote.BidAssetRate) + if err != nil { + return fmt.Errorf("cannot unmarshal asset rate: %w", err) + } + + // If the calculated asset amount is zero, we can't pay this amount + // using assets, so we'll reject the payment even if the user has set + // the override flag. + if quote.AssetAmount == 0 { + oneUnit := rfqmath.NewBigIntFixedPoint(1, 0) + oneUnitAsMSat := rfqmath.UnitsToMilliSatoshi(oneUnit, *rateFP) + return fmt.Errorf("rejecting payment of %v (invoice amount + "+ + "user-defined routing fee limit), smallest payable "+ + "amount with assets is equivalent to %v", + paymentAmount, oneUnitAsMSat) + } + + srvrLog.Debugf("Checking if payment is economical (min transportable "+ + "mSat: %d, paymentAmount: %d, allowOverpay=%v)", + quote.MinTransportableMsat, paymentAmount, allowOverpay) + + // If the override flag is set, we ignore this check and return early. + if allowOverpay { + return nil + } + + // If the payment amount is less than the minimal transportable amount + // dictated by the quote, we'll return an error to inform the user. They + // can still override this check if they want to proceed anyway. + if lnwire.MilliSatoshi(quote.MinTransportableMsat) > paymentAmount { + return fmt.Errorf("rejecting payment of %v (invoice "+ + "amount + user-defined routing fee limit), minimum "+ + "amount for an asset payment is %v mSAT with the "+ + "current rate of %v units/BTC; override this check "+ + "by specifying the allow_overpay flag", + paymentAmount, quote.MinTransportableMsat, + rateFP.String()) + } + + // The amount checks out, we can proceed with the payment. + return nil +} + // AddInvoice is a wrapper around lnd's lnrpc.AddInvoice method with asset // specific parameters. It allows RPC users to create invoices that correspond // to the specified asset amount. diff --git a/taprpc/tapchannelrpc/tapchannel.pb.go b/taprpc/tapchannelrpc/tapchannel.pb.go index c7ab8944e..f109c7263 100644 --- a/taprpc/tapchannelrpc/tapchannel.pb.go +++ b/taprpc/tapchannelrpc/tapchannel.pb.go @@ -377,6 +377,13 @@ type SendPaymentRequest struct { // payment will immediately be dispatched, skipping the rfq negotiation // phase, and using the following rfq id instead. RfqId []byte `protobuf:"bytes,5,opt,name=rfq_id,json=rfqId,proto3" json:"rfq_id,omitempty"` + // If a small invoice should be paid that is below the amount that always + // needs to be sent out to carry a single asset unit, then by default the + // payment is rejected. If this flag is set, then the payment will be + // allowed to proceed, even if it is uneconomical, meaning that more sats + // are sent out to the network than the invoice amount plus routing fees + // require to be paid. + AllowOverpay bool `protobuf:"varint,6,opt,name=allow_overpay,json=allowOverpay,proto3" json:"allow_overpay,omitempty"` } func (x *SendPaymentRequest) Reset() { @@ -446,6 +453,13 @@ func (x *SendPaymentRequest) GetRfqId() []byte { return nil } +func (x *SendPaymentRequest) GetAllowOverpay() bool { + if x != nil { + return x.AllowOverpay + } + return false +} + type SendPaymentResponse struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache @@ -792,7 +806,7 @@ var file_tapchannelrpc_tapchannel_proto_rawDesc = []byte{ 0x64, 0x73, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x04, 0x52, 0x03, 0x6b, 0x65, 0x79, 0x12, 0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0c, 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If this flag is set, then the payment will be + // allowed to proceed, even if it is uneconomical, meaning that more sats + // are sent out to the network than the invoice amount plus routing fees + // require to be paid. + bool allow_overpay = 6; } message SendPaymentResponse { diff --git a/taprpc/tapchannelrpc/tapchannel.swagger.json b/taprpc/tapchannelrpc/tapchannel.swagger.json index 8b853f4dd..f13b7be49 100644 --- a/taprpc/tapchannelrpc/tapchannel.swagger.json +++ b/taprpc/tapchannelrpc/tapchannel.swagger.json @@ -1470,6 +1470,10 @@ "type": "string", "format": "byte", "description": "The rfq id to use for this payment. If the user sets this value then the\npayment will immediately be dispatched, skipping the rfq negotiation\nphase, and using the following rfq id instead." + }, + "allow_overpay": { + "type": "boolean", + "description": "If a small invoice should be paid that is below the amount that always\nneeds to be sent out to carry a single asset unit, then by default the\npayment is rejected. If this flag is set, then the payment will be\nallowed to proceed, even if it is uneconomical, meaning that more sats\nare sent out to the network than the invoice amount plus routing fees\nrequire to be paid." } } },