From 6eb290d780946de7f5d6b3e9a85598062a17b92c Mon Sep 17 00:00:00 2001 From: Antoine Riard Date: Wed, 3 Jul 2019 10:26:17 -0400 Subject: [PATCH] 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. --- fuzz/fuzz_targets/full_stack_target.rs | 3 ++- lightning/src/ln/channelmonitor.rs | 35 ++++++++++++++++++++------ lightning/src/ln/functional_tests.rs | 12 +++++++++ 3 files changed, 42 insertions(+), 8 deletions(-) diff --git a/fuzz/fuzz_targets/full_stack_target.rs b/fuzz/fuzz_targets/full_stack_target.rs index b090831d..cf70569a 100644 --- 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("00000000000000000000000000000000000000000000000000000000000000000000000001000300000000000000000000000000000000000000000000000000000000000000000300320003000000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000030012000603000000000000000000000000000000030016001000000000030000000000000000000000000000000300120141030000000000000000000000000000000300fe00207500000000000000000000000000000000000000000000000000000000000000ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb181909679000000000000c35000000000000000000000000000000222ffffffffffffffff00000000000002220000000000000000000000fd000601e3030000000000000000000000000000000000000000000000000000000000000001030000000000000000000000000000000000000000000000000000000000000002030000000000000000000000000000000000000000000000000000000000000003030000000000000000000000000000000000000000000000000000000000000004030053030000000000000000000000000000000000000000000000000000000000000005030000000000000000000000000000000000000000000000000000000000000000010300000000000000000000000000000000fd00fd00fd0300120084030000000000000000000000000000000300940022ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb1819096793d0000000000000000000000000000000000000000000000000000000000000000005c000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001030000000000000000000000000000000c005e020000000100000000000000000000000000000000000000000000000000000000000000000000000000ffffffff0150c3000000000000220020ae00000000000000000000000000000000000000000000000000000000000000000000000c00000c00000c00000c00000c00000c00000c00000c00000c00000c00000c00000c000003001200430300000000000000000000000000000003005300243d000000000000000000000000000000000000000000000000000000000000000301000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000001030132000300000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000003014200030200000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000300000000000000000000000000000003011200060100000000000000000000000000000003011600100000000001000000000000000000000000000000050103020000000000000000000000000000000000000000000000000000000000000000c3500003e800fd00fd00fd0301120110010000000000000000000000000000000301ff00210000000000000000000000000000000000000000000000000000000000000e02000000000000001a00000000004c4b4000000000000003e800000000000003e80000000203f00005030000000000000000000000000000000000000000000000000000000000000100030000000000000000000000000000000000000000000000000000000000000200030000000000000000000000000000000000000000000000000000000000000300030000000000000000000000000000000000000000000000000000000000000400030000000000000000000000000000000000000000000000000000000000000500030000000000000000000000000000000301210000000000000000000000000000000000010000000000000000000000000000000a03011200620100000000000000000000000000000003017200233900000000000000000000000000000000000000000000000000000000000000f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000100010000000000000000000000000000000b030112004301000000000000000000000000000000030153002439000000000000000000000000000000000000000000000000000000000000000301000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000003001205ac030000000000000000000000000000000300ff00803d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003e80ff0000000000000000000000000000000000000000000000000000000000000000000121000300000000000000000000000000000000000000000000000000000000000005550000000e000001000000000000000003e8000000010000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff0300ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff0300fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff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&(Arc::clone(&logger) as Arc)); + 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&(Arc::clone(&logger) as Arc)); 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 bfde8cd9..9d6bb5c4 100644 --- a/lightning/src/ln/channelmonitor.rs +++ b/lightning/src/ln/channelmonitor.rs @@ -387,6 +387,7 @@ enum InputMaterial { key: SecretKey, preimage: Option, 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 Readable 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 88a10dc6..7667ce45 100644 --- 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 -- 2.30.2