Add RBF-bumping of preimage/timeout txn on remote HTLC outputs

Given they are only signed by us we can RBF at wish

Fix tests broken by introduction of more txn broadcast
(channel_monitor_network_test)

Add locktime in RemoteHTLC as it's needed to generate
timeout txn.

diff --git a/fuzz/fuzz_targets/full_stack_target.rs b/fuzz/fuzz_targets/full_stack_target.rs
index b090831d172cae36b8fbb9388a87f53b320e611b..cf70569a3f7ac4c1866e5ee081c9660ca260400c 100644 (file)
--- a/fuzz/fuzz_targets/full_stack_target.rs
+++ b/fuzz/fuzz_targets/full_stack_target.rs
@@ -869,6 +869,7 @@ mod tests {
                // 0200000001fd00000000000000000000000000000000000000000000000000000000000000000000000000000000014f00000000000000220020f60000000000000000000000000000000000000000000000000000000000000000000000 - the funding transaction
                // 00fd - A feerate request (returning min feerate, which our open_channel also uses) (gonna be ingested by FuzzEstimator)
                // 0c0000 - connect a block with no transactions
+               // 00fd - A feerate request (returning min feerate, which our open_channel also uses) (gonna be ingested by FuzzEstimator)
                // 0c0000 - connect a block with no transactions
                // 0c0000 - connect a block with no transactions
                // 0c0000 - connect a block with no transactions
@@ -878,7 +879,7 @@ mod tests {
                // - client now fails the HTLC backwards as it was unable to extract the payment preimage (CHECK 9 duplicate and CHECK 10)
 
                let logger = Arc::new(TrackingLogger { lines: Mutex::new(HashMap::new()) });
-               super::do_test(&::hex::decode("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&(Arc::clone(&logger) as Arc<dyn Logger>));
+               super::do_test(&::hex::decode("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&(Arc::clone(&logger) as Arc<dyn Logger>));
 
                let log_entries = logger.lines.lock().unwrap();
                assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling SendAcceptChannel event in peer_handler for node 030000000000000000000000000000000000000000000000000000000000000000 for channel ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb181909679".to_string())), Some(&1)); // 1

diff --git a/lightning/src/ln/channelmonitor.rs b/lightning/src/ln/channelmonitor.rs
index bfde8cd91b09a97882984b78cb53331ec5542d76..9d6bb5c47cfad2b75ca43f412d93ceee915c8d37 100644 (file)
--- a/lightning/src/ln/channelmonitor.rs
+++ b/lightning/src/ln/channelmonitor.rs
@@ -387,6 +387,7 @@ enum InputMaterial {
                key: SecretKey,
                preimage: Option<PaymentPreimage>,
                amount: u64,
+               locktime: u32,
        },
        LocalHTLC {
                script: Script,
@@ -411,12 +412,13 @@ impl Writeable for InputMaterial  {
                                }
                                writer.write_all(&byte_utils::be64_to_array(*amount))?;
                        },
-                       &InputMaterial::RemoteHTLC { ref script, ref key, ref preimage, ref amount } => {
+                       &InputMaterial::RemoteHTLC { ref script, ref key, ref preimage, ref amount, ref locktime } => {
                                writer.write_all(&[1; 1])?;
                                script.write(writer)?;
                                key.write(writer)?;
                                preimage.write(writer)?;
                                writer.write_all(&byte_utils::be64_to_array(*amount))?;
+                               writer.write_all(&byte_utils::be32_to_array(*locktime))?;
                        },
                        &InputMaterial::LocalHTLC { ref script, ref sigs, ref preimage, ref amount } => {
                                writer.write_all(&[2; 1])?;
@@ -457,11 +459,13 @@ impl<R: ::std::io::Read> Readable<R> for InputMaterial {
                                let key = Readable::read(reader)?;
                                let preimage = Readable::read(reader)?;
                                let amount = Readable::read(reader)?;
+                               let locktime = Readable::read(reader)?;
                                InputMaterial::RemoteHTLC {
                                        script,
                                        key,
                                        preimage,
-                                       amount
+                                       amount,
+                                       locktime
                                }
                        },
                        2 => {
@@ -1826,7 +1830,7 @@ impl ChannelMonitor {
                                                                                        });
                                                                                        log_trace!(self, "Outpoint {}:{} is being being claimed, if it doesn't succeed, a bumped claiming txn is going to be broadcast at height {}", single_htlc_tx.input[0].previous_output.txid, single_htlc_tx.input[0].previous_output.vout, height_timer);
                                                                                        let mut per_input_material = HashMap::with_capacity(1);
-                                                                                       per_input_material.insert(single_htlc_tx.input[0].previous_output, InputMaterial::RemoteHTLC { script: redeemscript, key: htlc_key, preimage: Some(*payment_preimage), amount: htlc.amount_msat / 1000 });
+                                                                                       per_input_material.insert(single_htlc_tx.input[0].previous_output, InputMaterial::RemoteHTLC { script: redeemscript, key: htlc_key, preimage: Some(*payment_preimage), amount: htlc.amount_msat / 1000, locktime: 0 });
                                                                                        match self.pending_claim_requests.entry(single_htlc_tx.txid()) {
                                                                                                hash_map::Entry::Occupied(_) => {},
                                                                                                hash_map::Entry::Vacant(entry) => { entry.insert(ClaimTxBumpMaterial { height_timer, feerate_previous: used_feerate, soonest_timelock: htlc.cltv_expiry, per_input_material}); }
@@ -1867,7 +1871,7 @@ impl ChannelMonitor {
                                                                        //TODO: track SpendableOutputDescriptor
                                                                        log_trace!(self, "Outpoint {}:{} is being being claimed, if it doesn't succeed, a bumped claiming txn is going to be broadcast at height {}", timeout_tx.input[0].previous_output.txid, timeout_tx.input[0].previous_output.vout, height_timer);
                                                                        let mut per_input_material = HashMap::with_capacity(1);
-                                                                       per_input_material.insert(timeout_tx.input[0].previous_output, InputMaterial::RemoteHTLC { script : redeemscript, key: htlc_key, preimage: None, amount: htlc.amount_msat / 1000 });
+                                                                       per_input_material.insert(timeout_tx.input[0].previous_output, InputMaterial::RemoteHTLC { script : redeemscript, key: htlc_key, preimage: None, amount: htlc.amount_msat / 1000, locktime: htlc.cltv_expiry });
                                                                        match self.pending_claim_requests.entry(timeout_tx.txid()) {
                                                                                hash_map::Entry::Occupied(_) => {},
                                                                                hash_map::Entry::Vacant(entry) => { entry.insert(ClaimTxBumpMaterial { height_timer, feerate_previous: used_feerate, soonest_timelock: htlc.cltv_expiry, per_input_material }); }
@@ -1911,7 +1915,7 @@ impl ChannelMonitor {
                                        for (input, info) in spend_tx.input.iter_mut().zip(inputs_info.iter()) {
                                                let (redeemscript, htlc_key) = sign_input!(sighash_parts, input, info.1, (info.0).0.to_vec());
                                                log_trace!(self, "Outpoint {}:{} is being being claimed, if it doesn't succeed, a bumped claiming txn is going to be broadcast at height {}", input.previous_output.txid, input.previous_output.vout, height_timer);
-                                               per_input_material.insert(input.previous_output, InputMaterial::RemoteHTLC { script: redeemscript, key: htlc_key, preimage: Some(*(info.0)), amount: info.1});
+                                               per_input_material.insert(input.previous_output, InputMaterial::RemoteHTLC { script: redeemscript, key: htlc_key, preimage: Some(*(info.0)), amount: info.1, locktime: 0});
                                        }
                                        match self.pending_claim_requests.entry(spend_tx.txid()) {
                                                hash_map::Entry::Occupied(_) => {},
@@ -2731,7 +2735,10 @@ impl ChannelMonitor {
                                        inputs_witnesses_weight += Self::get_witnesses_weight(if !is_htlc { &[InputDescriptors::RevokedOutput] } else if script.len() == OFFERED_HTLC_SCRIPT_WEIGHT { &[InputDescriptors::RevokedOfferedHTLC] } else if script.len() == ACCEPTED_HTLC_SCRIPT_WEIGHT { &[InputDescriptors::RevokedReceivedHTLC] } else { &[] });
                                        amt += *amount;
                                },
-                               &InputMaterial::RemoteHTLC { .. } => { },
+                               &InputMaterial::RemoteHTLC { ref preimage, ref amount, .. } => {
+                                       inputs_witnesses_weight += Self::get_witnesses_weight(if preimage.is_some() { &[InputDescriptors::OfferedHTLC] } else { &[InputDescriptors::ReceivedHTLC] });
+                                       amt += *amount;
+                               },
                                &InputMaterial::LocalHTLC { .. } => { return None; }
                        }
                }
@@ -2767,7 +2774,21 @@ impl ChannelMonitor {
                                        bumped_tx.input[i].witness.push(script.clone().into_bytes());
                                        log_trace!(self, "Going to broadcast bumped Penalty Transaction {} claiming revoked {} output {} from {} with new feerate {}", bumped_tx.txid(), if !is_htlc { "to_local" } else if script.len() == OFFERED_HTLC_SCRIPT_WEIGHT { "offered" } else if script.len() == ACCEPTED_HTLC_SCRIPT_WEIGHT { "received" } else { "" }, outp.vout, outp.txid, new_feerate);
                                },
-                               &InputMaterial::RemoteHTLC { .. } => {},
+                               &InputMaterial::RemoteHTLC { ref script, ref key, ref preimage, ref amount, ref locktime } => {
+                                       if !preimage.is_some() { bumped_tx.lock_time = *locktime };
+                                       let sighash_parts = bip143::SighashComponents::new(&bumped_tx);
+                                       let sighash = hash_to_message!(&sighash_parts.sighash_all(&bumped_tx.input[i], &script, *amount)[..]);
+                                       let sig = self.secp_ctx.sign(&sighash, &key);
+                                       bumped_tx.input[i].witness.push(sig.serialize_der().to_vec());
+                                       bumped_tx.input[i].witness[0].push(SigHashType::All as u8);
+                                       if let &Some(preimage) = preimage {
+                                               bumped_tx.input[i].witness.push(preimage.clone().0.to_vec());
+                                       } else {
+                                               bumped_tx.input[i].witness.push(vec![0]);
+                                       }
+                                       bumped_tx.input[i].witness.push(script.clone().into_bytes());
+                                       log_trace!(self, "Going to broadcast bumped Claim Transaction {} claiming remote {} htlc output {} from {} with new feerate {}", bumped_tx.txid(), if preimage.is_some() { "offered" } else { "received" }, outp.vout, outp.txid, new_feerate);
+                               },
                                &InputMaterial::LocalHTLC { .. } => {
                                        //TODO : Given that Local Commitment Transaction and HTLC-Timeout/HTLC-Success are counter-signed by peer, we can't
                                        // RBF them. Need a Lightning specs change and package relay modification :

diff --git a/lightning/src/ln/functional_tests.rs b/lightning/src/ln/functional_tests.rs
index 88a10dc6b8192a08b16199c80594856b84c354ea..7667ce45aa74f60af6e9748daa6b4b79088da52c 100644 (file)
--- a/lightning/src/ln/functional_tests.rs
+++ b/lightning/src/ln/functional_tests.rs
@@ -1783,8 +1783,10 @@ fn channel_monitor_network_test() {
        // nodes[3] gets the preimage, but nodes[2] already disconnected, resulting in a nodes[2]
        // HTLC-Timeout and a nodes[3] claim against it (+ its own announces)
        nodes[2].node.peer_disconnected(&nodes[3].node.get_our_node_id(), true);
+       let node2_commitment_txid;
        {
                let node_txn = test_txn_broadcast(&nodes[2], &chan_3, None, HTLCType::TIMEOUT);
+               node2_commitment_txid = node_txn[0].txid();
 
                // Claim the payment on nodes[3], giving it knowledge of the preimage
                claim_funds!(nodes[3], nodes[2], payment_preimage_1, 3_000_000);
@@ -1818,6 +1820,16 @@ fn channel_monitor_network_test() {
                        nodes[3].block_notifier.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
                }
 
+               // Clear bumped claiming txn spending node 2 commitment tx. Bumped txn are generated after reaching some height timer.
+               {
+                       let mut node_txn = nodes[3].tx_broadcaster.txn_broadcasted.lock().unwrap();
+                       node_txn.retain(|tx| {
+                               if tx.input[0].previous_output.txid == node2_commitment_txid {
+                                       false
+                               } else { true }
+                       });
+               }
+
                let node_txn = test_txn_broadcast(&nodes[3], &chan_4, None, HTLCType::TIMEOUT);
 
                // Claim the payment on nodes[4], giving it knowledge of the preimage