Add outpoint index in watch_outputs to fix tracking#653

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Merged
TheBlueMatt merged 3 commits into from
Oct 15, 2020
Merged

Add outpoint index in watch_outputs to fix tracking #653

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30aad79
Add transaction index in watched_outputs
Jul 1, 2020
613ac6e
Add test_htlc_no_detection
Oct 6, 2020
27ee115
Assert on correct registeration of outputs index
Oct 9, 2020
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8 changes: 4 additions & 4 deletions lightning/src/chain/chainmonitor.rs
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Original file line numberDiff line numberDiff line change
Expand Up@@ -95,8 +95,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit

if let Some(ref chain_source) = self.chain_source {
for (txid, outputs) in txn_outputs.drain(..) {
for (idx, output) in outputs.iter().enumerate() {
chain_source.register_output(&OutPoint { txid, index: idx as u16 }, &output.script_pubkey);
for (idx, output) in outputs.iter() {
chain_source.register_output(&OutPoint { txid, index: *idx as u16 }, &output.script_pubkey);
}
}
}
Expand DownExpand Up@@ -152,8 +152,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit
if let Some(ref chain_source) = self.chain_source {
chain_source.register_tx(&funding_txo.0.txid, &funding_txo.1);
for (txid, outputs) in monitor.get_outputs_to_watch().iter() {
for (idx, script_pubkey) in outputs.iter().enumerate() {
chain_source.register_output(&OutPoint { txid: *txid, index: idx as u16 }, &script_pubkey);
for (idx, script_pubkey) in outputs.iter() {
chain_source.register_output(&OutPoint { txid: *txid, index: *idx as u16 }, script_pubkey);
}
}
}
Expand Down
75 changes: 53 additions & 22 deletions lightning/src/chain/channelmonitor.rs
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Original file line numberDiff line numberDiff line change
Expand Up@@ -666,7 +666,7 @@ pub struct ChannelMonitor<ChanSigner: ChannelKeys> {
// interface knows about the TXOs that we want to be notified of spends of. We could probably
// be smart and derive them from the above storage fields, but its much simpler and more
// Obviously Correct (tm) if we just keep track of them explicitly.
outputs_to_watch: HashMap<Txid, Vec<Script>>,
outputs_to_watch: HashMap<Txid, Vec<(u32, Script)>>,

#[cfg(test)]
pub onchain_tx_handler: OnchainTxHandler<ChanSigner>,
Expand DownExpand Up@@ -914,10 +914,11 @@ impl<ChanSigner: ChannelKeys + Writeable> ChannelMonitor<ChanSigner> {
}

(self.outputs_to_watch.len() as u64).write(writer)?;
for (txid, output_scripts) in self.outputs_to_watch.iter() {
for (txid, idx_scripts) in self.outputs_to_watch.iter() {
txid.write(writer)?;
(output_scripts.len() as u64).write(writer)?;
for script in output_scripts.iter() {
(idx_scripts.len() as u64).write(writer)?;
for (idx, script) in idx_scripts.iter() {
idx.write(writer)?;
script.write(writer)?;
}
}
Expand DownExpand Up@@ -963,7 +964,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
onchain_tx_handler.provide_latest_holder_tx(initial_holder_commitment_tx);

let mut outputs_to_watch = HashMap::new();
outputs_to_watch.insert(funding_info.0.txid, vec![funding_info.1.clone()]);
outputs_to_watch.insert(funding_info.0.txid, vec![(funding_info.0.index as u32, funding_info.1.clone())]);

ChannelMonitor {
latest_update_id: 0,
Expand DownExpand Up@@ -1209,7 +1210,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
/// transaction), which we must learn about spends of via block_connected().
///
/// (C-not exported) because we have no HashMap bindings
pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<Script>> {
pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<(u32, Script)>> {
// If we've detected a counterparty commitment tx on chain, we must include it in the set
// of outputs to watch for spends of, otherwise we're likely to lose user funds. Because
// its trivial to do, double-check that here.
Expand DownExpand Up@@ -1264,7 +1265,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
/// HTLC-Success/HTLC-Timeout transactions.
/// Return updates for HTLC pending in the channel and failed automatically by the broadcast of
/// revoked counterparty commitment tx
fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
// Most secp and related errors trying to create keys means we have no hope of constructing
// a spend transaction...so we return no transactions to broadcast
let mut claimable_outpoints = Vec::new();
Expand DownExpand Up@@ -1319,7 +1320,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
if !claimable_outpoints.is_empty() || per_commitment_option.is_some() { // ie we're confident this is actually ours
// We're definitely a counterparty commitment transaction!
log_trace!(logger, "Got broadcast of revoked counterparty commitment transaction, going to generate general spend tx with {} inputs", claimable_outpoints.len());
watch_outputs.append(&mut tx.output.clone());
for (idx, outp) in tx.output.iter().enumerate() {
watch_outputs.push((idx as u32, outp.clone()));
}
self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

macro_rules! check_htlc_fails {
Expand DownExpand Up@@ -1366,7 +1369,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
// already processed the block, resulting in the counterparty_commitment_txn_on_chain entry
// not being generated by the above conditional. Thus, to be safe, we go ahead and
// insert it here.
watch_outputs.append(&mut tx.output.clone());
for (idx, outp) in tx.output.iter().enumerate() {
watch_outputs.push((idx as u32, outp.clone()));
}
self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

log_trace!(logger, "Got broadcast of non-revoked counterparty commitment transaction {}", commitment_txid);
Expand DownExpand Up@@ -1456,7 +1461,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
}

/// Attempts to claim a counterparty HTLC-Success/HTLC-Timeout's outputs using the revocation key
fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<TxOut>)>) where L::Target: Logger {
fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<(u32, TxOut)>)>) where L::Target: Logger {
let htlc_txid = tx.txid();
if tx.input.len() != 1 || tx.output.len() != 1 || tx.input[0].witness.len() != 5 {
return (Vec::new(), None)
Expand All@@ -1478,10 +1483,11 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
log_trace!(logger, "Counterparty HTLC broadcast {}:{}", htlc_txid, 0);
let witness_data = InputMaterial::Revoked { per_commitment_point, counterparty_delayed_payment_base_key: self.counterparty_tx_cache.counterparty_delayed_payment_base_key, counterparty_htlc_base_key: self.counterparty_tx_cache.counterparty_htlc_base_key, per_commitment_key, input_descriptor: InputDescriptors::RevokedOutput, amount: tx.output[0].value, htlc: None, on_counterparty_tx_csv: self.counterparty_tx_cache.on_counterparty_tx_csv };
let claimable_outpoints = vec!(ClaimRequest { absolute_timelock: height + self.counterparty_tx_cache.on_counterparty_tx_csv as u32, aggregable: true, outpoint: BitcoinOutPoint { txid: htlc_txid, vout: 0}, witness_data });
(claimable_outpoints, Some((htlc_txid, tx.output.clone())))
let outputs = vec![(0, tx.output[0].clone())];
(claimable_outpoints, Some((htlc_txid, outputs)))
}

fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<TxOut>, Option<(Script, PublicKey, PublicKey)>) {
fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<(u32, TxOut)>, Option<(Script, PublicKey, PublicKey)>) {
let mut claim_requests = Vec::with_capacity(holder_tx.htlc_outputs.len());
let mut watch_outputs = Vec::with_capacity(holder_tx.htlc_outputs.len());

Expand All@@ -1502,7 +1508,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
} else { None },
amount: htlc.amount_msat,
}});
watch_outputs.push(commitment_tx.output[transaction_output_index as usize].clone());
watch_outputs.push((transaction_output_index, commitment_tx.output[transaction_output_index as usize].clone()));
}
}

Expand All@@ -1512,7 +1518,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
/// Attempts to claim any claimable HTLCs in a commitment transaction which was not (yet)
/// revoked using data in holder_claimable_outpoints.
/// Should not be used if check_spend_revoked_transaction succeeds.
fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
let commitment_txid = tx.txid();
let mut claim_requests = Vec::new();
let mut watch_outputs = Vec::new();
Expand DownExpand Up@@ -1662,7 +1668,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
/// [`get_outputs_to_watch`].
///
/// [`get_outputs_to_watch`]: #method.get_outputs_to_watch
pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<TxOut>)>
pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<(u32, TxOut)>)>
where B::Target: BroadcasterInterface,
F::Target: FeeEstimator,
L::Target: Logger,
Expand DownExpand Up@@ -1763,9 +1769,23 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
// Determine new outputs to watch by comparing against previously known outputs to watch,
// updating the latter in the process.
watch_outputs.retain(|&(ref txid, ref txouts)| {
let output_scripts = txouts.iter().map(|o| o.script_pubkey.clone()).collect();
self.outputs_to_watch.insert(txid.clone(), output_scripts).is_none()
let idx_and_scripts = txouts.iter().map(|o| (o.0, o.1.script_pubkey.clone())).collect();
self.outputs_to_watch.insert(txid.clone(), idx_and_scripts).is_none()

@TheBlueMattTheBlueMattOct 15, 2020

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Can we iterate the new watch txn to assert they're known types so that the panic!() two hunks down is definitely correct?

@TheBlueMattTheBlueMattOct 15, 2020

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Actually, its all test-only, it doesnt matter.

});
#[cfg(test)]
{
// If we see a transaction for which we registered outputs previously,
// make sure the registered scriptpubkey at the expected index match
// the actual transaction output one. We failed this case before #653.
for tx in &txn_matched {
if let Some(outputs) = self.get_outputs_to_watch().get(&tx.txid()) {
for idx_and_script in outputs.iter() {
assert!((idx_and_script.0 as usize) < tx.output.len());
assert_eq!(tx.output[idx_and_script.0 as usize].script_pubkey, idx_and_script.1);
}
}
}
}
watch_outputs
}

Expand DownExpand Up@@ -1813,8 +1833,19 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
fn spends_watched_output(&self, tx: &Transaction) -> bool {
for input in tx.input.iter() {
if let Some(outputs) = self.get_outputs_to_watch().get(&input.previous_output.txid) {
for (idx, _script_pubkey) in outputs.iter().enumerate() {
if idx == input.previous_output.vout as usize {
for (idx, _script_pubkey) in outputs.iter() {
if *idx == input.previous_output.vout {
#[cfg(test)]
{
// If the expected script is a known type, check that the witness
// appears to be spending the correct type (ie that the match would
// actually succeed in BIP 158/159-style filters).
if _script_pubkey.is_v0_p2wsh() {
assert_eq!(&bitcoin::Address::p2wsh(&Script::from(input.witness.last().unwrap().clone()), bitcoin::Network::Bitcoin).script_pubkey(), _script_pubkey);
} else if _script_pubkey.is_v0_p2wpkh() {
assert_eq!(&bitcoin::Address::p2wpkh(&bitcoin::PublicKey::from_slice(&input.witness.last().unwrap()).unwrap(), bitcoin::Network::Bitcoin).unwrap().script_pubkey(), _script_pubkey);
} else { panic!(); }
}
return true;
}
}
Expand DownExpand Up@@ -2316,13 +2347,13 @@ impl<ChanSigner: ChannelKeys + Readable> Readable for (BlockHash, ChannelMonitor
}

let outputs_to_watch_len: u64 = Readable::read(reader)?;
let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<Vec<Script>>())));
let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<u32>() + mem::size_of::<Vec<Script>>())));
for _ in 0..outputs_to_watch_len {
let txid = Readable::read(reader)?;
let outputs_len: u64 = Readable::read(reader)?;
let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / mem::size_of::<Script>()));
let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<u32>() + mem::size_of::<Script>())));
for _ in 0..outputs_len {
outputs.push(Readable::read(reader)?);
outputs.push((Readable::read(reader)?, Readable::read(reader)?));
}
if let Some(_) = outputs_to_watch.insert(txid, outputs) {
return Err(DecodeError::InvalidValue);
Expand Down
101 changes: 47 additions & 54 deletions lightning/src/ln/functional_tests.rs
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Original file line numberDiff line numberDiff line change
Expand Up@@ -7157,60 +7157,6 @@ fn test_failure_delay_dust_htlc_local_commitment() {
do_test_failure_delay_dust_htlc_local_commitment(false);
}

#[test]
fn test_no_failure_dust_htlc_local_commitment() {
// Transaction filters for failing back dust htlc based on local commitment txn infos has been
// prone to error, we test here that a dummy transaction don't fail them.

let chanmon_cfgs = create_chanmon_cfgs(2);
let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());

// Rebalance a bit
send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);

let as_dust_limit = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;
let bs_dust_limit = nodes[1].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;

// We route 2 dust-HTLCs between A and B
let (preimage_1, _) = route_payment(&nodes[0], &[&nodes[1]], bs_dust_limit*1000);
let (preimage_2, _) = route_payment(&nodes[1], &[&nodes[0]], as_dust_limit*1000);

// Build a dummy invalid transaction trying to spend a commitment tx
let input = TxIn {
previous_output: BitcoinOutPoint { txid: chan.3.txid(), vout: 0 },
script_sig: Script::new(),
sequence: 0,
witness: Vec::new(),
};

let outp = TxOut {
script_pubkey: Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(),
value: 10000,
};

let dummy_tx = Transaction {
version: 2,
lock_time: 0,
input: vec![input],
output: vec![outp]
};

let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
nodes[0].chain_monitor.chain_monitor.block_connected(&header, &[(0, &dummy_tx)], 1);
assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);
// We broadcast a few more block to check everything is all right
connect_blocks(&nodes[0], 20, 1, true, header.block_hash());
assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);

claim_payment(&nodes[0], &vec!(&nodes[1])[..], preimage_1, bs_dust_limit*1000);
claim_payment(&nodes[1], &vec!(&nodes[0])[..], preimage_2, as_dust_limit*1000);
}

fn do_test_sweep_outbound_htlc_failure_update(revoked: bool, local: bool) {
// Outbound HTLC-failure updates must be cancelled if we get a reorg before we reach ANTI_REORG_DELAY.
// Broadcast of revoked remote commitment tx, trigger failure-update of dust/non-dust HTLCs
Expand DownExpand Up@@ -8497,3 +8443,50 @@ fn test_concurrent_monitor_claim() {
check_spends!(htlc_txn[1], bob_state_y);
}
}

#[test]
fn test_htlc_no_detection() {
// This test is a mutation to underscore the detection logic bug we had
// before #653. HTLC value routed is above the remaining balance, thus
// inverting HTLC and `to_remote` output. HTLC will come second and
// it wouldn't be seen by pre-#653 detection as we were enumerate()'ing
// on a watched outputs vector (Vec<TxOut>) thus implicitly relying on
// outputs order detection for correct spending children filtring.

let chanmon_cfgs = create_chanmon_cfgs(2);
let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
let nodes = create_network(2, &node_cfgs, &node_chanmgrs);

// Create some initial channels
let chan_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());

send_payment(&nodes[0], &vec!(&nodes[1])[..], 1_000_000, 1_000_000);
let (_, our_payment_hash) = route_payment(&nodes[0], &vec!(&nodes[1])[..], 2_000_000);
let local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
assert_eq!(local_txn[0].input.len(), 1);
assert_eq!(local_txn[0].output.len(), 3);
check_spends!(local_txn[0], chan_1.3);

// Timeout HTLC on A's chain and so it can generate a HTLC-Timeout tx
let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
// We deliberately connect the local tx twice as this should provoke a failure calling
// this test before #653 fix.
connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
check_closed_broadcast!(nodes[0], false);
check_added_monitors!(nodes[0], 1);

let htlc_timeout = {
let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
assert_eq!(node_txn[0].input.len(), 1);
assert_eq!(node_txn[0].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
check_spends!(node_txn[0], local_txn[0]);
node_txn[0].clone()
};

let header_201 = BlockHeader { version: 0x20000000, prev_blockhash: header.block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
connect_block(&nodes[0], &Block { header: header_201, txdata: vec![htlc_timeout.clone()] }, 201);
connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1, 201, true, header_201.block_hash());
expect_payment_failed!(nodes[0], our_payment_hash, true);
}
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
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 Merged

TheBlueMatt
merged 3 commits into

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Oct 15, 2020
 Merged


Add outpoint index in watch_outputs to fix tracking
#653
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30aad79

Add transaction index in watched_outputs

Jul 1, 2020
613ac6e

Add test_htlc_no_detection

Oct 6, 2020
27ee115

Assert on correct registeration of outputs index

Oct 9, 2020

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8 changes: 4 additions & 4 deletions
lightning/src/chain/chainmonitor.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -95,8 +95,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit

 if let Some(ref chain_source) = self.chain_source {
 for (txid, outputs) in txn_outputs.drain(..) {
 for (idx, output) in outputs.iter().enumerate() {
 chain_source.register_output(&OutPoint { txid, index: idx as u16 }, &output.script_pubkey);
 for (idx, output) in outputs.iter() {
 chain_source.register_output(&OutPoint { txid, index: *idx as u16 }, &output.script_pubkey);
 }
 }
 }
Expand DownExpand Up@@ -152,8 +152,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit
 if let Some(ref chain_source) = self.chain_source {
 chain_source.register_tx(&funding_txo.0.txid, &funding_txo.1);
 for (txid, outputs) in monitor.get_outputs_to_watch().iter() {
 for (idx, script_pubkey) in outputs.iter().enumerate() {
 chain_source.register_output(&OutPoint { txid: *txid, index: idx as u16 }, &script_pubkey);
 for (idx, script_pubkey) in outputs.iter() {
 chain_source.register_output(&OutPoint { txid: *txid, index: *idx as u16 }, script_pubkey);
 }
 }
 }
Expand Down

75 changes: 53 additions & 22 deletions
lightning/src/chain/channelmonitor.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -666,7 +666,7 @@ pub struct ChannelMonitor<ChanSigner: ChannelKeys> {
	// interface knows about the TXOs that we want to be notified of spends of. We could probably
	// be smart and derive them from the above storage fields, but its much simpler and more
	// Obviously Correct (tm) if we just keep track of them explicitly.
	outputs_to_watch: HashMap<Txid, Vec<Script>>,
	outputs_to_watch: HashMap<Txid, Vec<(u32, Script)>>,

	#[cfg(test)]
	pub onchain_tx_handler: OnchainTxHandler<ChanSigner>,
Expand DownExpand Up@@ -914,10 +914,11 @@ impl<ChanSigner: ChannelKeys + Writeable> ChannelMonitor<ChanSigner> {
 }

 (self.outputs_to_watch.len() as u64).write(writer)?;
 for (txid, output_scripts) in self.outputs_to_watch.iter() {
 for (txid, idx_scripts) in self.outputs_to_watch.iter() {
 txid.write(writer)?;
 (output_scripts.len() as u64).write(writer)?;
 for script in output_scripts.iter() {
 (idx_scripts.len() as u64).write(writer)?;
 for (idx, script) in idx_scripts.iter() {
 idx.write(writer)?;
 script.write(writer)?;
 }
 }
Expand DownExpand Up@@ -963,7 +964,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 onchain_tx_handler.provide_latest_holder_tx(initial_holder_commitment_tx);

 let mut outputs_to_watch = HashMap::new();
 outputs_to_watch.insert(funding_info.0.txid, vec![funding_info.1.clone()]);
 outputs_to_watch.insert(funding_info.0.txid, vec![(funding_info.0.index as u32, funding_info.1.clone())]);

 ChannelMonitor {
 latest_update_id: 0,
Expand DownExpand Up@@ -1209,7 +1210,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// transaction), which we must learn about spends of via block_connected().
	///
	/// (C-not exported) because we have no HashMap bindings
	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<Script>> {
	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<(u32, Script)>> {
 // If we've detected a counterparty commitment tx on chain, we must include it in the set
 // of outputs to watch for spends of, otherwise we're likely to lose user funds. Because
 // its trivial to do, double-check that here.
Expand DownExpand Up@@ -1264,7 +1265,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// HTLC-Success/HTLC-Timeout transactions.
	/// Return updates for HTLC pending in the channel and failed automatically by the broadcast of
	/// revoked counterparty commitment tx
	fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
	fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
 // Most secp and related errors trying to create keys means we have no hope of constructing
 // a spend transaction...so we return no transactions to broadcast
 let mut claimable_outpoints = Vec::new();
Expand DownExpand Up@@ -1319,7 +1320,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 if !claimable_outpoints.is_empty() || per_commitment_option.is_some() { // ie we're confident this is actually ours
 // We're definitely a counterparty commitment transaction!
 log_trace!(logger, "Got broadcast of revoked counterparty commitment transaction, going to generate general spend tx with {} inputs", claimable_outpoints.len());
 watch_outputs.append(&mut tx.output.clone());
 for (idx, outp) in tx.output.iter().enumerate() {
 watch_outputs.push((idx as u32, outp.clone()));
 }
 self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

 macro_rules! check_htlc_fails {
Expand DownExpand Up@@ -1366,7 +1369,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 // already processed the block, resulting in the counterparty_commitment_txn_on_chain entry
 // not being generated by the above conditional. Thus, to be safe, we go ahead and
 // insert it here.
 watch_outputs.append(&mut tx.output.clone());
 for (idx, outp) in tx.output.iter().enumerate() {
 watch_outputs.push((idx as u32, outp.clone()));
 }
 self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

 log_trace!(logger, "Got broadcast of non-revoked counterparty commitment transaction {}", commitment_txid);
Expand DownExpand Up@@ -1456,7 +1461,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	}

	/// Attempts to claim a counterparty HTLC-Success/HTLC-Timeout's outputs using the revocation key
	fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<TxOut>)>) where L::Target: Logger {
	fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<(u32, TxOut)>)>) where L::Target: Logger {
 let htlc_txid = tx.txid();
 if tx.input.len() != 1 || tx.output.len() != 1 || tx.input[0].witness.len() != 5 {
 return (Vec::new(), None)
Expand All@@ -1478,10 +1483,11 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 log_trace!(logger, "Counterparty HTLC broadcast {}:{}", htlc_txid, 0);
 let witness_data = InputMaterial::Revoked { per_commitment_point, counterparty_delayed_payment_base_key: self.counterparty_tx_cache.counterparty_delayed_payment_base_key, counterparty_htlc_base_key: self.counterparty_tx_cache.counterparty_htlc_base_key, per_commitment_key, input_descriptor: InputDescriptors::RevokedOutput, amount: tx.output[0].value, htlc: None, on_counterparty_tx_csv: self.counterparty_tx_cache.on_counterparty_tx_csv };
 let claimable_outpoints = vec!(ClaimRequest { absolute_timelock: height + self.counterparty_tx_cache.on_counterparty_tx_csv as u32, aggregable: true, outpoint: BitcoinOutPoint { txid: htlc_txid, vout: 0}, witness_data });
 (claimable_outpoints, Some((htlc_txid, tx.output.clone())))
 let outputs = vec![(0, tx.output[0].clone())];
 (claimable_outpoints, Some((htlc_txid, outputs)))
	}

	fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<TxOut>, Option<(Script, PublicKey, PublicKey)>) {
	fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<(u32, TxOut)>, Option<(Script, PublicKey, PublicKey)>) {
 let mut claim_requests = Vec::with_capacity(holder_tx.htlc_outputs.len());
 let mut watch_outputs = Vec::with_capacity(holder_tx.htlc_outputs.len());

Expand All@@ -1502,7 +1508,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 } else { None },
 amount: htlc.amount_msat,
 }});
 watch_outputs.push(commitment_tx.output[transaction_output_index as usize].clone());
 watch_outputs.push((transaction_output_index, commitment_tx.output[transaction_output_index as usize].clone()));
 }
 }

Expand All@@ -1512,7 +1518,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// Attempts to claim any claimable HTLCs in a commitment transaction which was not (yet)
	/// revoked using data in holder_claimable_outpoints.
	/// Should not be used if check_spend_revoked_transaction succeeds.
	fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
	fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
 let commitment_txid = tx.txid();
 let mut claim_requests = Vec::new();
 let mut watch_outputs = Vec::new();
Expand DownExpand Up@@ -1662,7 +1668,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// [`get_outputs_to_watch`].
	///
	/// [`get_outputs_to_watch`]: #method.get_outputs_to_watch
	pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<TxOut>)>
	pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<(u32, TxOut)>)>
 where B::Target: BroadcasterInterface,
 F::Target: FeeEstimator,
 L::Target: Logger,
Expand DownExpand Up@@ -1763,9 +1769,23 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 // Determine new outputs to watch by comparing against previously known outputs to watch,
 // updating the latter in the process.
 watch_outputs.retain(|&(ref txid, ref txouts)| {
 let output_scripts = txouts.iter().map(|o| o.script_pubkey.clone()).collect();
 self.outputs_to_watch.insert(txid.clone(), output_scripts).is_none()
 let idx_and_scripts = txouts.iter().map(|o| (o.0, o.1.script_pubkey.clone())).collect();
 self.outputs_to_watch.insert(txid.clone(), idx_and_scripts).is_none()
@TheBlueMattTheBlueMattOct 15, 2020

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Can we iterate the new watch txn to assert they're known types so that the panic!() two hunks down is definitely correct?
@TheBlueMattTheBlueMattOct 15, 2020

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Actually, its all test-only, it doesnt matter.
 });
 #[cfg(test)]
 {
 // If we see a transaction for which we registered outputs previously,
 // make sure the registered scriptpubkey at the expected index match
 // the actual transaction output one. We failed this case before #653.
 for tx in &txn_matched {
 if let Some(outputs) = self.get_outputs_to_watch().get(&tx.txid()) {
 for idx_and_script in outputs.iter() {
 assert!((idx_and_script.0 as usize) < tx.output.len());
 assert_eq!(tx.output[idx_and_script.0 as usize].script_pubkey, idx_and_script.1);
 }
 }
 }
 }
 watch_outputs
	}

Expand DownExpand Up@@ -1813,8 +1833,19 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	fn spends_watched_output(&self, tx: &Transaction) -> bool {
 for input in tx.input.iter() {
 if let Some(outputs) = self.get_outputs_to_watch().get(&input.previous_output.txid) {
 for (idx, _script_pubkey) in outputs.iter().enumerate() {
 if idx == input.previous_output.vout as usize {
 for (idx, _script_pubkey) in outputs.iter() {
 if *idx == input.previous_output.vout {
 #[cfg(test)]
 {
 // If the expected script is a known type, check that the witness
 // appears to be spending the correct type (ie that the match would
 // actually succeed in BIP 158/159-style filters).
 if _script_pubkey.is_v0_p2wsh() {
 assert_eq!(&bitcoin::Address::p2wsh(&Script::from(input.witness.last().unwrap().clone()), bitcoin::Network::Bitcoin).script_pubkey(), _script_pubkey);
 } else if _script_pubkey.is_v0_p2wpkh() {
 assert_eq!(&bitcoin::Address::p2wpkh(&bitcoin::PublicKey::from_slice(&input.witness.last().unwrap()).unwrap(), bitcoin::Network::Bitcoin).unwrap().script_pubkey(), _script_pubkey);
 } else { panic!(); }
 }
 return true;
 }
 }
Expand DownExpand Up@@ -2316,13 +2347,13 @@ impl<ChanSigner: ChannelKeys + Readable> Readable for (BlockHash, ChannelMonitor
 }

 let outputs_to_watch_len: u64 = Readable::read(reader)?;
 let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<Vec<Script>>())));
 let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<u32>() + mem::size_of::<Vec<Script>>())));
 for _ in 0..outputs_to_watch_len {
 let txid = Readable::read(reader)?;
 let outputs_len: u64 = Readable::read(reader)?;
 let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / mem::size_of::<Script>()));
 let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<u32>() + mem::size_of::<Script>())));
 for _ in 0..outputs_len {
 outputs.push(Readable::read(reader)?);
 outputs.push((Readable::read(reader)?, Readable::read(reader)?));
 }
 if let Some(_) = outputs_to_watch.insert(txid, outputs) {
 return Err(DecodeError::InvalidValue);
Expand Down

101 changes: 47 additions & 54 deletions
lightning/src/ln/functional_tests.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -7157,60 +7157,6 @@ fn test_failure_delay_dust_htlc_local_commitment() {
	do_test_failure_delay_dust_htlc_local_commitment(false);
}

#[test]
fn test_no_failure_dust_htlc_local_commitment() {
	// Transaction filters for failing back dust htlc based on local commitment txn infos has been
	// prone to error, we test here that a dummy transaction don't fail them.

	let chanmon_cfgs = create_chanmon_cfgs(2);
	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
	let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());

	// Rebalance a bit
	send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);

	let as_dust_limit = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;
	let bs_dust_limit = nodes[1].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;

	// We route 2 dust-HTLCs between A and B
	let (preimage_1, _) = route_payment(&nodes[0], &[&nodes[1]], bs_dust_limit*1000);
	let (preimage_2, _) = route_payment(&nodes[1], &[&nodes[0]], as_dust_limit*1000);

	// Build a dummy invalid transaction trying to spend a commitment tx
	let input = TxIn {
 previous_output: BitcoinOutPoint { txid: chan.3.txid(), vout: 0 },
 script_sig: Script::new(),
 sequence: 0,
 witness: Vec::new(),
	};

	let outp = TxOut {
 script_pubkey: Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(),
 value: 10000,
	};

	let dummy_tx = Transaction {
 version: 2,
 lock_time: 0,
 input: vec![input],
 output: vec![outp]
	};

	let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
	nodes[0].chain_monitor.chain_monitor.block_connected(&header, &[(0, &dummy_tx)], 1);
	assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
	assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);
	// We broadcast a few more block to check everything is all right
	connect_blocks(&nodes[0], 20, 1, true, header.block_hash());
	assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
	assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);

	claim_payment(&nodes[0], &vec!(&nodes[1])[..], preimage_1, bs_dust_limit*1000);
	claim_payment(&nodes[1], &vec!(&nodes[0])[..], preimage_2, as_dust_limit*1000);
}

fn do_test_sweep_outbound_htlc_failure_update(revoked: bool, local: bool) {
	// Outbound HTLC-failure updates must be cancelled if we get a reorg before we reach ANTI_REORG_DELAY.
	// Broadcast of revoked remote commitment tx, trigger failure-update of dust/non-dust HTLCs
Expand DownExpand Up@@ -8497,3 +8443,50 @@ fn test_concurrent_monitor_claim() {
 check_spends!(htlc_txn[1], bob_state_y);
	}
}

#[test]
fn test_htlc_no_detection() {
	// This test is a mutation to underscore the detection logic bug we had
 // before #653. HTLC value routed is above the remaining balance, thus
 // inverting HTLC and `to_remote` output. HTLC will come second and
 // it wouldn't be seen by pre-#653 detection as we were enumerate()'ing
 // on a watched outputs vector (Vec<TxOut>) thus implicitly relying on
 // outputs order detection for correct spending children filtring.

 let chanmon_cfgs = create_chanmon_cfgs(2);
 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);

 // Create some initial channels
 let chan_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());

 send_payment(&nodes[0], &vec!(&nodes[1])[..], 1_000_000, 1_000_000);
 let (_, our_payment_hash) = route_payment(&nodes[0], &vec!(&nodes[1])[..], 2_000_000);
 let local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
 assert_eq!(local_txn[0].input.len(), 1);
 assert_eq!(local_txn[0].output.len(), 3);
 check_spends!(local_txn[0], chan_1.3);

 // Timeout HTLC on A's chain and so it can generate a HTLC-Timeout tx
 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
	// We deliberately connect the local tx twice as this should provoke a failure calling
	// this test before #653 fix.
 connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
 check_closed_broadcast!(nodes[0], false);
 check_added_monitors!(nodes[0], 1);

 let htlc_timeout = {
 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
 assert_eq!(node_txn[0].input.len(), 1);
 assert_eq!(node_txn[0].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
 check_spends!(node_txn[0], local_txn[0]);
 node_txn[0].clone()
 };

 let header_201 = BlockHeader { version: 0x20000000, prev_blockhash: header.block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 connect_block(&nodes[0], &Block { header: header_201, txdata: vec![htlc_timeout.clone()] }, 201);
 connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1, 201, true, header_201.block_hash());
 expect_payment_failed!(nodes[0], our_payment_hash, true);
}

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if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
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 Merged

TheBlueMatt
merged 3 commits into

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Oct 15, 2020
 Merged


Add outpoint index in watch_outputs to fix tracking
#653
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30aad79

Add transaction index in watched_outputs

Jul 1, 2020
613ac6e

Add test_htlc_no_detection

Oct 6, 2020
27ee115

Assert on correct registeration of outputs index

Oct 9, 2020

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8 changes: 4 additions & 4 deletions
lightning/src/chain/chainmonitor.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -95,8 +95,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit

 if let Some(ref chain_source) = self.chain_source {
 for (txid, outputs) in txn_outputs.drain(..) {
 for (idx, output) in outputs.iter().enumerate() {
 chain_source.register_output(&OutPoint { txid, index: idx as u16 }, &output.script_pubkey);
 for (idx, output) in outputs.iter() {
 chain_source.register_output(&OutPoint { txid, index: *idx as u16 }, &output.script_pubkey);
 }
 }
 }
Expand DownExpand Up@@ -152,8 +152,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit
 if let Some(ref chain_source) = self.chain_source {
 chain_source.register_tx(&funding_txo.0.txid, &funding_txo.1);
 for (txid, outputs) in monitor.get_outputs_to_watch().iter() {
 for (idx, script_pubkey) in outputs.iter().enumerate() {
 chain_source.register_output(&OutPoint { txid: *txid, index: idx as u16 }, &script_pubkey);
 for (idx, script_pubkey) in outputs.iter() {
 chain_source.register_output(&OutPoint { txid: *txid, index: *idx as u16 }, script_pubkey);
 }
 }
 }
Expand Down

75 changes: 53 additions & 22 deletions
lightning/src/chain/channelmonitor.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -666,7 +666,7 @@ pub struct ChannelMonitor<ChanSigner: ChannelKeys> {
	// interface knows about the TXOs that we want to be notified of spends of. We could probably
	// be smart and derive them from the above storage fields, but its much simpler and more
	// Obviously Correct (tm) if we just keep track of them explicitly.
	outputs_to_watch: HashMap<Txid, Vec<Script>>,
	outputs_to_watch: HashMap<Txid, Vec<(u32, Script)>>,

	#[cfg(test)]
	pub onchain_tx_handler: OnchainTxHandler<ChanSigner>,
Expand DownExpand Up@@ -914,10 +914,11 @@ impl<ChanSigner: ChannelKeys + Writeable> ChannelMonitor<ChanSigner> {
 }

 (self.outputs_to_watch.len() as u64).write(writer)?;
 for (txid, output_scripts) in self.outputs_to_watch.iter() {
 for (txid, idx_scripts) in self.outputs_to_watch.iter() {
 txid.write(writer)?;
 (output_scripts.len() as u64).write(writer)?;
 for script in output_scripts.iter() {
 (idx_scripts.len() as u64).write(writer)?;
 for (idx, script) in idx_scripts.iter() {
 idx.write(writer)?;
 script.write(writer)?;
 }
 }
Expand DownExpand Up@@ -963,7 +964,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 onchain_tx_handler.provide_latest_holder_tx(initial_holder_commitment_tx);

 let mut outputs_to_watch = HashMap::new();
 outputs_to_watch.insert(funding_info.0.txid, vec![funding_info.1.clone()]);
 outputs_to_watch.insert(funding_info.0.txid, vec![(funding_info.0.index as u32, funding_info.1.clone())]);

 ChannelMonitor {
 latest_update_id: 0,
Expand DownExpand Up@@ -1209,7 +1210,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// transaction), which we must learn about spends of via block_connected().
	///
	/// (C-not exported) because we have no HashMap bindings
	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<Script>> {
	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<(u32, Script)>> {
 // If we've detected a counterparty commitment tx on chain, we must include it in the set
 // of outputs to watch for spends of, otherwise we're likely to lose user funds. Because
 // its trivial to do, double-check that here.
Expand DownExpand Up@@ -1264,7 +1265,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// HTLC-Success/HTLC-Timeout transactions.
	/// Return updates for HTLC pending in the channel and failed automatically by the broadcast of
	/// revoked counterparty commitment tx
	fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
	fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
 // Most secp and related errors trying to create keys means we have no hope of constructing
 // a spend transaction...so we return no transactions to broadcast
 let mut claimable_outpoints = Vec::new();
Expand DownExpand Up@@ -1319,7 +1320,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 if !claimable_outpoints.is_empty() || per_commitment_option.is_some() { // ie we're confident this is actually ours
 // We're definitely a counterparty commitment transaction!
 log_trace!(logger, "Got broadcast of revoked counterparty commitment transaction, going to generate general spend tx with {} inputs", claimable_outpoints.len());
 watch_outputs.append(&mut tx.output.clone());
 for (idx, outp) in tx.output.iter().enumerate() {
 watch_outputs.push((idx as u32, outp.clone()));
 }
 self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

 macro_rules! check_htlc_fails {
Expand DownExpand Up@@ -1366,7 +1369,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 // already processed the block, resulting in the counterparty_commitment_txn_on_chain entry
 // not being generated by the above conditional. Thus, to be safe, we go ahead and
 // insert it here.
 watch_outputs.append(&mut tx.output.clone());
 for (idx, outp) in tx.output.iter().enumerate() {
 watch_outputs.push((idx as u32, outp.clone()));
 }
 self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

 log_trace!(logger, "Got broadcast of non-revoked counterparty commitment transaction {}", commitment_txid);
Expand DownExpand Up@@ -1456,7 +1461,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	}

	/// Attempts to claim a counterparty HTLC-Success/HTLC-Timeout's outputs using the revocation key
	fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<TxOut>)>) where L::Target: Logger {
	fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<(u32, TxOut)>)>) where L::Target: Logger {
 let htlc_txid = tx.txid();
 if tx.input.len() != 1 || tx.output.len() != 1 || tx.input[0].witness.len() != 5 {
 return (Vec::new(), None)
Expand All@@ -1478,10 +1483,11 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 log_trace!(logger, "Counterparty HTLC broadcast {}:{}", htlc_txid, 0);
 let witness_data = InputMaterial::Revoked { per_commitment_point, counterparty_delayed_payment_base_key: self.counterparty_tx_cache.counterparty_delayed_payment_base_key, counterparty_htlc_base_key: self.counterparty_tx_cache.counterparty_htlc_base_key, per_commitment_key, input_descriptor: InputDescriptors::RevokedOutput, amount: tx.output[0].value, htlc: None, on_counterparty_tx_csv: self.counterparty_tx_cache.on_counterparty_tx_csv };
 let claimable_outpoints = vec!(ClaimRequest { absolute_timelock: height + self.counterparty_tx_cache.on_counterparty_tx_csv as u32, aggregable: true, outpoint: BitcoinOutPoint { txid: htlc_txid, vout: 0}, witness_data });
 (claimable_outpoints, Some((htlc_txid, tx.output.clone())))
 let outputs = vec![(0, tx.output[0].clone())];
 (claimable_outpoints, Some((htlc_txid, outputs)))
	}

	fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<TxOut>, Option<(Script, PublicKey, PublicKey)>) {
	fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<(u32, TxOut)>, Option<(Script, PublicKey, PublicKey)>) {
 let mut claim_requests = Vec::with_capacity(holder_tx.htlc_outputs.len());
 let mut watch_outputs = Vec::with_capacity(holder_tx.htlc_outputs.len());

Expand All@@ -1502,7 +1508,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 } else { None },
 amount: htlc.amount_msat,
 }});
 watch_outputs.push(commitment_tx.output[transaction_output_index as usize].clone());
 watch_outputs.push((transaction_output_index, commitment_tx.output[transaction_output_index as usize].clone()));
 }
 }

Expand All@@ -1512,7 +1518,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// Attempts to claim any claimable HTLCs in a commitment transaction which was not (yet)
	/// revoked using data in holder_claimable_outpoints.
	/// Should not be used if check_spend_revoked_transaction succeeds.
	fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
	fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
 let commitment_txid = tx.txid();
 let mut claim_requests = Vec::new();
 let mut watch_outputs = Vec::new();
Expand DownExpand Up@@ -1662,7 +1668,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// [`get_outputs_to_watch`].
	///
	/// [`get_outputs_to_watch`]: #method.get_outputs_to_watch
	pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<TxOut>)>
	pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<(u32, TxOut)>)>
 where B::Target: BroadcasterInterface,
 F::Target: FeeEstimator,
 L::Target: Logger,
Expand DownExpand Up@@ -1763,9 +1769,23 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 // Determine new outputs to watch by comparing against previously known outputs to watch,
 // updating the latter in the process.
 watch_outputs.retain(|&(ref txid, ref txouts)| {
 let output_scripts = txouts.iter().map(|o| o.script_pubkey.clone()).collect();
 self.outputs_to_watch.insert(txid.clone(), output_scripts).is_none()
 let idx_and_scripts = txouts.iter().map(|o| (o.0, o.1.script_pubkey.clone())).collect();
 self.outputs_to_watch.insert(txid.clone(), idx_and_scripts).is_none()
@TheBlueMattTheBlueMattOct 15, 2020

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Can we iterate the new watch txn to assert they're known types so that the panic!() two hunks down is definitely correct?
@TheBlueMattTheBlueMattOct 15, 2020

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Actually, its all test-only, it doesnt matter.
 });
 #[cfg(test)]
 {
 // If we see a transaction for which we registered outputs previously,
 // make sure the registered scriptpubkey at the expected index match
 // the actual transaction output one. We failed this case before #653.
 for tx in &txn_matched {
 if let Some(outputs) = self.get_outputs_to_watch().get(&tx.txid()) {
 for idx_and_script in outputs.iter() {
 assert!((idx_and_script.0 as usize) < tx.output.len());
 assert_eq!(tx.output[idx_and_script.0 as usize].script_pubkey, idx_and_script.1);
 }
 }
 }
 }
 watch_outputs
	}

Expand DownExpand Up@@ -1813,8 +1833,19 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	fn spends_watched_output(&self, tx: &Transaction) -> bool {
 for input in tx.input.iter() {
 if let Some(outputs) = self.get_outputs_to_watch().get(&input.previous_output.txid) {
 for (idx, _script_pubkey) in outputs.iter().enumerate() {
 if idx == input.previous_output.vout as usize {
 for (idx, _script_pubkey) in outputs.iter() {
 if *idx == input.previous_output.vout {
 #[cfg(test)]
 {
 // If the expected script is a known type, check that the witness
 // appears to be spending the correct type (ie that the match would
 // actually succeed in BIP 158/159-style filters).
 if _script_pubkey.is_v0_p2wsh() {
 assert_eq!(&bitcoin::Address::p2wsh(&Script::from(input.witness.last().unwrap().clone()), bitcoin::Network::Bitcoin).script_pubkey(), _script_pubkey);
 } else if _script_pubkey.is_v0_p2wpkh() {
 assert_eq!(&bitcoin::Address::p2wpkh(&bitcoin::PublicKey::from_slice(&input.witness.last().unwrap()).unwrap(), bitcoin::Network::Bitcoin).unwrap().script_pubkey(), _script_pubkey);
 } else { panic!(); }
 }
 return true;
 }
 }
Expand DownExpand Up@@ -2316,13 +2347,13 @@ impl<ChanSigner: ChannelKeys + Readable> Readable for (BlockHash, ChannelMonitor
 }

 let outputs_to_watch_len: u64 = Readable::read(reader)?;
 let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<Vec<Script>>())));
 let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<u32>() + mem::size_of::<Vec<Script>>())));
 for _ in 0..outputs_to_watch_len {
 let txid = Readable::read(reader)?;
 let outputs_len: u64 = Readable::read(reader)?;
 let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / mem::size_of::<Script>()));
 let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<u32>() + mem::size_of::<Script>())));
 for _ in 0..outputs_len {
 outputs.push(Readable::read(reader)?);
 outputs.push((Readable::read(reader)?, Readable::read(reader)?));
 }
 if let Some(_) = outputs_to_watch.insert(txid, outputs) {
 return Err(DecodeError::InvalidValue);
Expand Down

101 changes: 47 additions & 54 deletions
lightning/src/ln/functional_tests.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -7157,60 +7157,6 @@ fn test_failure_delay_dust_htlc_local_commitment() {
	do_test_failure_delay_dust_htlc_local_commitment(false);
}

#[test]
fn test_no_failure_dust_htlc_local_commitment() {
	// Transaction filters for failing back dust htlc based on local commitment txn infos has been
	// prone to error, we test here that a dummy transaction don't fail them.

	let chanmon_cfgs = create_chanmon_cfgs(2);
	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
	let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());

	// Rebalance a bit
	send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);

	let as_dust_limit = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;
	let bs_dust_limit = nodes[1].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;

	// We route 2 dust-HTLCs between A and B
	let (preimage_1, _) = route_payment(&nodes[0], &[&nodes[1]], bs_dust_limit*1000);
	let (preimage_2, _) = route_payment(&nodes[1], &[&nodes[0]], as_dust_limit*1000);

	// Build a dummy invalid transaction trying to spend a commitment tx
	let input = TxIn {
 previous_output: BitcoinOutPoint { txid: chan.3.txid(), vout: 0 },
 script_sig: Script::new(),
 sequence: 0,
 witness: Vec::new(),
	};

	let outp = TxOut {
 script_pubkey: Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(),
 value: 10000,
	};

	let dummy_tx = Transaction {
 version: 2,
 lock_time: 0,
 input: vec![input],
 output: vec![outp]
	};

	let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
	nodes[0].chain_monitor.chain_monitor.block_connected(&header, &[(0, &dummy_tx)], 1);
	assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
	assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);
	// We broadcast a few more block to check everything is all right
	connect_blocks(&nodes[0], 20, 1, true, header.block_hash());
	assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
	assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);

	claim_payment(&nodes[0], &vec!(&nodes[1])[..], preimage_1, bs_dust_limit*1000);
	claim_payment(&nodes[1], &vec!(&nodes[0])[..], preimage_2, as_dust_limit*1000);
}

fn do_test_sweep_outbound_htlc_failure_update(revoked: bool, local: bool) {
	// Outbound HTLC-failure updates must be cancelled if we get a reorg before we reach ANTI_REORG_DELAY.
	// Broadcast of revoked remote commitment tx, trigger failure-update of dust/non-dust HTLCs
Expand DownExpand Up@@ -8497,3 +8443,50 @@ fn test_concurrent_monitor_claim() {
 check_spends!(htlc_txn[1], bob_state_y);
	}
}

#[test]
fn test_htlc_no_detection() {
	// This test is a mutation to underscore the detection logic bug we had
 // before #653. HTLC value routed is above the remaining balance, thus
 // inverting HTLC and `to_remote` output. HTLC will come second and
 // it wouldn't be seen by pre-#653 detection as we were enumerate()'ing
 // on a watched outputs vector (Vec<TxOut>) thus implicitly relying on
 // outputs order detection for correct spending children filtring.

 let chanmon_cfgs = create_chanmon_cfgs(2);
 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);

 // Create some initial channels
 let chan_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());

 send_payment(&nodes[0], &vec!(&nodes[1])[..], 1_000_000, 1_000_000);
 let (_, our_payment_hash) = route_payment(&nodes[0], &vec!(&nodes[1])[..], 2_000_000);
 let local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
 assert_eq!(local_txn[0].input.len(), 1);
 assert_eq!(local_txn[0].output.len(), 3);
 check_spends!(local_txn[0], chan_1.3);

 // Timeout HTLC on A's chain and so it can generate a HTLC-Timeout tx
 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
	// We deliberately connect the local tx twice as this should provoke a failure calling
	// this test before #653 fix.
 connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
 check_closed_broadcast!(nodes[0], false);
 check_added_monitors!(nodes[0], 1);

 let htlc_timeout = {
 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
 assert_eq!(node_txn[0].input.len(), 1);
 assert_eq!(node_txn[0].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
 check_spends!(node_txn[0], local_txn[0]);
 node_txn[0].clone()
 };

 let header_201 = BlockHeader { version: 0x20000000, prev_blockhash: header.block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 connect_block(&nodes[0], &Block { header: header_201, txdata: vec![htlc_timeout.clone()] }, 201);
 connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1, 201, true, header_201.block_hash());
 expect_payment_failed!(nodes[0], our_payment_hash, true);
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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 Merged

TheBlueMatt
merged 3 commits into

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Oct 15, 2020
 Merged


Add outpoint index in watch_outputs to fix tracking
#653
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30aad79

Add transaction index in watched_outputs

Jul 1, 2020
613ac6e

Add test_htlc_no_detection

Oct 6, 2020
27ee115

Assert on correct registeration of outputs index

Oct 9, 2020

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8 changes: 4 additions & 4 deletions
lightning/src/chain/chainmonitor.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -95,8 +95,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit

 if let Some(ref chain_source) = self.chain_source {
 for (txid, outputs) in txn_outputs.drain(..) {
 for (idx, output) in outputs.iter().enumerate() {
 chain_source.register_output(&OutPoint { txid, index: idx as u16 }, &output.script_pubkey);
 for (idx, output) in outputs.iter() {
 chain_source.register_output(&OutPoint { txid, index: *idx as u16 }, &output.script_pubkey);
 }
 }
 }
Expand DownExpand Up@@ -152,8 +152,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit
 if let Some(ref chain_source) = self.chain_source {
 chain_source.register_tx(&funding_txo.0.txid, &funding_txo.1);
 for (txid, outputs) in monitor.get_outputs_to_watch().iter() {
 for (idx, script_pubkey) in outputs.iter().enumerate() {
 chain_source.register_output(&OutPoint { txid: *txid, index: idx as u16 }, &script_pubkey);
 for (idx, script_pubkey) in outputs.iter() {
 chain_source.register_output(&OutPoint { txid: *txid, index: *idx as u16 }, script_pubkey);
 }
 }
 }
Expand Down

75 changes: 53 additions & 22 deletions
lightning/src/chain/channelmonitor.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -666,7 +666,7 @@ pub struct ChannelMonitor<ChanSigner: ChannelKeys> {
	// interface knows about the TXOs that we want to be notified of spends of. We could probably
	// be smart and derive them from the above storage fields, but its much simpler and more
	// Obviously Correct (tm) if we just keep track of them explicitly.
	outputs_to_watch: HashMap<Txid, Vec<Script>>,
	outputs_to_watch: HashMap<Txid, Vec<(u32, Script)>>,

	#[cfg(test)]
	pub onchain_tx_handler: OnchainTxHandler<ChanSigner>,
Expand DownExpand Up@@ -914,10 +914,11 @@ impl<ChanSigner: ChannelKeys + Writeable> ChannelMonitor<ChanSigner> {
 }

 (self.outputs_to_watch.len() as u64).write(writer)?;
 for (txid, output_scripts) in self.outputs_to_watch.iter() {
 for (txid, idx_scripts) in self.outputs_to_watch.iter() {
 txid.write(writer)?;
 (output_scripts.len() as u64).write(writer)?;
 for script in output_scripts.iter() {
 (idx_scripts.len() as u64).write(writer)?;
 for (idx, script) in idx_scripts.iter() {
 idx.write(writer)?;
 script.write(writer)?;
 }
 }
Expand DownExpand Up@@ -963,7 +964,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 onchain_tx_handler.provide_latest_holder_tx(initial_holder_commitment_tx);

 let mut outputs_to_watch = HashMap::new();
 outputs_to_watch.insert(funding_info.0.txid, vec![funding_info.1.clone()]);
 outputs_to_watch.insert(funding_info.0.txid, vec![(funding_info.0.index as u32, funding_info.1.clone())]);

 ChannelMonitor {
 latest_update_id: 0,
Expand DownExpand Up@@ -1209,7 +1210,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// transaction), which we must learn about spends of via block_connected().
	///
	/// (C-not exported) because we have no HashMap bindings
	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<Script>> {
	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<(u32, Script)>> {
 // If we've detected a counterparty commitment tx on chain, we must include it in the set
 // of outputs to watch for spends of, otherwise we're likely to lose user funds. Because
 // its trivial to do, double-check that here.
Expand DownExpand Up@@ -1264,7 +1265,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// HTLC-Success/HTLC-Timeout transactions.
	/// Return updates for HTLC pending in the channel and failed automatically by the broadcast of
	/// revoked counterparty commitment tx
	fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
	fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
 // Most secp and related errors trying to create keys means we have no hope of constructing
 // a spend transaction...so we return no transactions to broadcast
 let mut claimable_outpoints = Vec::new();
Expand DownExpand Up@@ -1319,7 +1320,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 if !claimable_outpoints.is_empty() || per_commitment_option.is_some() { // ie we're confident this is actually ours
 // We're definitely a counterparty commitment transaction!
 log_trace!(logger, "Got broadcast of revoked counterparty commitment transaction, going to generate general spend tx with {} inputs", claimable_outpoints.len());
 watch_outputs.append(&mut tx.output.clone());
 for (idx, outp) in tx.output.iter().enumerate() {
 watch_outputs.push((idx as u32, outp.clone()));
 }
 self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

 macro_rules! check_htlc_fails {
Expand DownExpand Up@@ -1366,7 +1369,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 // already processed the block, resulting in the counterparty_commitment_txn_on_chain entry
 // not being generated by the above conditional. Thus, to be safe, we go ahead and
 // insert it here.
 watch_outputs.append(&mut tx.output.clone());
 for (idx, outp) in tx.output.iter().enumerate() {
 watch_outputs.push((idx as u32, outp.clone()));
 }
 self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

 log_trace!(logger, "Got broadcast of non-revoked counterparty commitment transaction {}", commitment_txid);
Expand DownExpand Up@@ -1456,7 +1461,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	}

	/// Attempts to claim a counterparty HTLC-Success/HTLC-Timeout's outputs using the revocation key
	fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<TxOut>)>) where L::Target: Logger {
	fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<(u32, TxOut)>)>) where L::Target: Logger {
 let htlc_txid = tx.txid();
 if tx.input.len() != 1 || tx.output.len() != 1 || tx.input[0].witness.len() != 5 {
 return (Vec::new(), None)
Expand All@@ -1478,10 +1483,11 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 log_trace!(logger, "Counterparty HTLC broadcast {}:{}", htlc_txid, 0);
 let witness_data = InputMaterial::Revoked { per_commitment_point, counterparty_delayed_payment_base_key: self.counterparty_tx_cache.counterparty_delayed_payment_base_key, counterparty_htlc_base_key: self.counterparty_tx_cache.counterparty_htlc_base_key, per_commitment_key, input_descriptor: InputDescriptors::RevokedOutput, amount: tx.output[0].value, htlc: None, on_counterparty_tx_csv: self.counterparty_tx_cache.on_counterparty_tx_csv };
 let claimable_outpoints = vec!(ClaimRequest { absolute_timelock: height + self.counterparty_tx_cache.on_counterparty_tx_csv as u32, aggregable: true, outpoint: BitcoinOutPoint { txid: htlc_txid, vout: 0}, witness_data });
 (claimable_outpoints, Some((htlc_txid, tx.output.clone())))
 let outputs = vec![(0, tx.output[0].clone())];
 (claimable_outpoints, Some((htlc_txid, outputs)))
	}

	fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<TxOut>, Option<(Script, PublicKey, PublicKey)>) {
	fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<(u32, TxOut)>, Option<(Script, PublicKey, PublicKey)>) {
 let mut claim_requests = Vec::with_capacity(holder_tx.htlc_outputs.len());
 let mut watch_outputs = Vec::with_capacity(holder_tx.htlc_outputs.len());

Expand All@@ -1502,7 +1508,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 } else { None },
 amount: htlc.amount_msat,
 }});
 watch_outputs.push(commitment_tx.output[transaction_output_index as usize].clone());
 watch_outputs.push((transaction_output_index, commitment_tx.output[transaction_output_index as usize].clone()));
 }
 }

Expand All@@ -1512,7 +1518,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// Attempts to claim any claimable HTLCs in a commitment transaction which was not (yet)
	/// revoked using data in holder_claimable_outpoints.
	/// Should not be used if check_spend_revoked_transaction succeeds.
	fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
	fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
 let commitment_txid = tx.txid();
 let mut claim_requests = Vec::new();
 let mut watch_outputs = Vec::new();
Expand DownExpand Up@@ -1662,7 +1668,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// [`get_outputs_to_watch`].
	///
	/// [`get_outputs_to_watch`]: #method.get_outputs_to_watch
	pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<TxOut>)>
	pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<(u32, TxOut)>)>
 where B::Target: BroadcasterInterface,
 F::Target: FeeEstimator,
 L::Target: Logger,
Expand DownExpand Up@@ -1763,9 +1769,23 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 // Determine new outputs to watch by comparing against previously known outputs to watch,
 // updating the latter in the process.
 watch_outputs.retain(|&(ref txid, ref txouts)| {
 let output_scripts = txouts.iter().map(|o| o.script_pubkey.clone()).collect();
 self.outputs_to_watch.insert(txid.clone(), output_scripts).is_none()
 let idx_and_scripts = txouts.iter().map(|o| (o.0, o.1.script_pubkey.clone())).collect();
 self.outputs_to_watch.insert(txid.clone(), idx_and_scripts).is_none()
@TheBlueMattTheBlueMattOct 15, 2020

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Can we iterate the new watch txn to assert they're known types so that the panic!() two hunks down is definitely correct?
@TheBlueMattTheBlueMattOct 15, 2020

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Actually, its all test-only, it doesnt matter.
 });
 #[cfg(test)]
 {
 // If we see a transaction for which we registered outputs previously,
 // make sure the registered scriptpubkey at the expected index match
 // the actual transaction output one. We failed this case before #653.
 for tx in &txn_matched {
 if let Some(outputs) = self.get_outputs_to_watch().get(&tx.txid()) {
 for idx_and_script in outputs.iter() {
 assert!((idx_and_script.0 as usize) < tx.output.len());
 assert_eq!(tx.output[idx_and_script.0 as usize].script_pubkey, idx_and_script.1);
 }
 }
 }
 }
 watch_outputs
	}

Expand DownExpand Up@@ -1813,8 +1833,19 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	fn spends_watched_output(&self, tx: &Transaction) -> bool {
 for input in tx.input.iter() {
 if let Some(outputs) = self.get_outputs_to_watch().get(&input.previous_output.txid) {
 for (idx, _script_pubkey) in outputs.iter().enumerate() {
 if idx == input.previous_output.vout as usize {
 for (idx, _script_pubkey) in outputs.iter() {
 if *idx == input.previous_output.vout {
 #[cfg(test)]
 {
 // If the expected script is a known type, check that the witness
 // appears to be spending the correct type (ie that the match would
 // actually succeed in BIP 158/159-style filters).
 if _script_pubkey.is_v0_p2wsh() {
 assert_eq!(&bitcoin::Address::p2wsh(&Script::from(input.witness.last().unwrap().clone()), bitcoin::Network::Bitcoin).script_pubkey(), _script_pubkey);
 } else if _script_pubkey.is_v0_p2wpkh() {
 assert_eq!(&bitcoin::Address::p2wpkh(&bitcoin::PublicKey::from_slice(&input.witness.last().unwrap()).unwrap(), bitcoin::Network::Bitcoin).unwrap().script_pubkey(), _script_pubkey);
 } else { panic!(); }
 }
 return true;
 }
 }
Expand DownExpand Up@@ -2316,13 +2347,13 @@ impl<ChanSigner: ChannelKeys + Readable> Readable for (BlockHash, ChannelMonitor
 }

 let outputs_to_watch_len: u64 = Readable::read(reader)?;
 let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<Vec<Script>>())));
 let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<u32>() + mem::size_of::<Vec<Script>>())));
 for _ in 0..outputs_to_watch_len {
 let txid = Readable::read(reader)?;
 let outputs_len: u64 = Readable::read(reader)?;
 let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / mem::size_of::<Script>()));
 let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<u32>() + mem::size_of::<Script>())));
 for _ in 0..outputs_len {
 outputs.push(Readable::read(reader)?);
 outputs.push((Readable::read(reader)?, Readable::read(reader)?));
 }
 if let Some(_) = outputs_to_watch.insert(txid, outputs) {
 return Err(DecodeError::InvalidValue);
Expand Down

101 changes: 47 additions & 54 deletions
lightning/src/ln/functional_tests.rs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -7157,60 +7157,6 @@ fn test_failure_delay_dust_htlc_local_commitment() {
	do_test_failure_delay_dust_htlc_local_commitment(false);
}

#[test]
fn test_no_failure_dust_htlc_local_commitment() {
	// Transaction filters for failing back dust htlc based on local commitment txn infos has been
	// prone to error, we test here that a dummy transaction don't fail them.

	let chanmon_cfgs = create_chanmon_cfgs(2);
	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
	let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());

	// Rebalance a bit
	send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);

	let as_dust_limit = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;
	let bs_dust_limit = nodes[1].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;

	// We route 2 dust-HTLCs between A and B
	let (preimage_1, _) = route_payment(&nodes[0], &[&nodes[1]], bs_dust_limit*1000);
	let (preimage_2, _) = route_payment(&nodes[1], &[&nodes[0]], as_dust_limit*1000);

	// Build a dummy invalid transaction trying to spend a commitment tx
	let input = TxIn {
 previous_output: BitcoinOutPoint { txid: chan.3.txid(), vout: 0 },
 script_sig: Script::new(),
 sequence: 0,
 witness: Vec::new(),
	};

	let outp = TxOut {
 script_pubkey: Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(),
 value: 10000,
	};

	let dummy_tx = Transaction {
 version: 2,
 lock_time: 0,
 input: vec![input],
 output: vec![outp]
	};

	let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
	nodes[0].chain_monitor.chain_monitor.block_connected(&header, &[(0, &dummy_tx)], 1);
	assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
	assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);
	// We broadcast a few more block to check everything is all right
	connect_blocks(&nodes[0], 20, 1, true, header.block_hash());
	assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
	assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);

	claim_payment(&nodes[0], &vec!(&nodes[1])[..], preimage_1, bs_dust_limit*1000);
	claim_payment(&nodes[1], &vec!(&nodes[0])[..], preimage_2, as_dust_limit*1000);
}

fn do_test_sweep_outbound_htlc_failure_update(revoked: bool, local: bool) {
	// Outbound HTLC-failure updates must be cancelled if we get a reorg before we reach ANTI_REORG_DELAY.
	// Broadcast of revoked remote commitment tx, trigger failure-update of dust/non-dust HTLCs
Expand DownExpand Up@@ -8497,3 +8443,50 @@ fn test_concurrent_monitor_claim() {
 check_spends!(htlc_txn[1], bob_state_y);
	}
}

#[test]
fn test_htlc_no_detection() {
	// This test is a mutation to underscore the detection logic bug we had
 // before #653. HTLC value routed is above the remaining balance, thus
 // inverting HTLC and `to_remote` output. HTLC will come second and
 // it wouldn't be seen by pre-#653 detection as we were enumerate()'ing
 // on a watched outputs vector (Vec<TxOut>) thus implicitly relying on
 // outputs order detection for correct spending children filtring.

 let chanmon_cfgs = create_chanmon_cfgs(2);
 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);

 // Create some initial channels
 let chan_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());

 send_payment(&nodes[0], &vec!(&nodes[1])[..], 1_000_000, 1_000_000);
 let (_, our_payment_hash) = route_payment(&nodes[0], &vec!(&nodes[1])[..], 2_000_000);
 let local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
 assert_eq!(local_txn[0].input.len(), 1);
 assert_eq!(local_txn[0].output.len(), 3);
 check_spends!(local_txn[0], chan_1.3);

 // Timeout HTLC on A's chain and so it can generate a HTLC-Timeout tx
 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
	// We deliberately connect the local tx twice as this should provoke a failure calling
	// this test before #653 fix.
 connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
 check_closed_broadcast!(nodes[0], false);
 check_added_monitors!(nodes[0], 1);

 let htlc_timeout = {
 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
 assert_eq!(node_txn[0].input.len(), 1);
 assert_eq!(node_txn[0].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
 check_spends!(node_txn[0], local_txn[0]);
 node_txn[0].clone()
 };

 let header_201 = BlockHeader { version: 0x20000000, prev_blockhash: header.block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 connect_block(&nodes[0], &Block { header: header_201, txdata: vec![htlc_timeout.clone()] }, 201);
 connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1, 201, true, header_201.block_hash());
 expect_payment_failed!(nodes[0], our_payment_hash, true);
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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 Merged

TheBlueMatt
merged 3 commits into

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Oct 15, 2020
 Merged


Add outpoint index in watch_outputs to fix tracking
#653
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30aad79

Add transaction index in watched_outputs

Jul 1, 2020
613ac6e

Add test_htlc_no_detection

Oct 6, 2020
27ee115

Assert on correct registeration of outputs index

Oct 9, 2020

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8 changes: 4 additions & 4 deletions
lightning/src/chain/chainmonitor.rs

View file


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Original file line numberDiff line numberDiff line change
Expand Up@@ -95,8 +95,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit

 if let Some(ref chain_source) = self.chain_source {
 for (txid, outputs) in txn_outputs.drain(..) {
 for (idx, output) in outputs.iter().enumerate() {
 chain_source.register_output(&OutPoint { txid, index: idx as u16 }, &output.script_pubkey);
 for (idx, output) in outputs.iter() {
 chain_source.register_output(&OutPoint { txid, index: *idx as u16 }, &output.script_pubkey);
 }
 }
 }
Expand DownExpand Up@@ -152,8 +152,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit
 if let Some(ref chain_source) = self.chain_source {
 chain_source.register_tx(&funding_txo.0.txid, &funding_txo.1);
 for (txid, outputs) in monitor.get_outputs_to_watch().iter() {
 for (idx, script_pubkey) in outputs.iter().enumerate() {
 chain_source.register_output(&OutPoint { txid: *txid, index: idx as u16 }, &script_pubkey);
 for (idx, script_pubkey) in outputs.iter() {
 chain_source.register_output(&OutPoint { txid: *txid, index: *idx as u16 }, script_pubkey);
 }
 }
 }
Expand Down

75 changes: 53 additions & 22 deletions
lightning/src/chain/channelmonitor.rs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -666,7 +666,7 @@ pub struct ChannelMonitor<ChanSigner: ChannelKeys> {
	// interface knows about the TXOs that we want to be notified of spends of. We could probably
	// be smart and derive them from the above storage fields, but its much simpler and more
	// Obviously Correct (tm) if we just keep track of them explicitly.
	outputs_to_watch: HashMap<Txid, Vec<Script>>,
	outputs_to_watch: HashMap<Txid, Vec<(u32, Script)>>,

	#[cfg(test)]
	pub onchain_tx_handler: OnchainTxHandler<ChanSigner>,
Expand DownExpand Up@@ -914,10 +914,11 @@ impl<ChanSigner: ChannelKeys + Writeable> ChannelMonitor<ChanSigner> {
 }

 (self.outputs_to_watch.len() as u64).write(writer)?;
 for (txid, output_scripts) in self.outputs_to_watch.iter() {
 for (txid, idx_scripts) in self.outputs_to_watch.iter() {
 txid.write(writer)?;
 (output_scripts.len() as u64).write(writer)?;
 for script in output_scripts.iter() {
 (idx_scripts.len() as u64).write(writer)?;
 for (idx, script) in idx_scripts.iter() {
 idx.write(writer)?;
 script.write(writer)?;
 }
 }
Expand DownExpand Up@@ -963,7 +964,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 onchain_tx_handler.provide_latest_holder_tx(initial_holder_commitment_tx);

 let mut outputs_to_watch = HashMap::new();
 outputs_to_watch.insert(funding_info.0.txid, vec![funding_info.1.clone()]);
 outputs_to_watch.insert(funding_info.0.txid, vec![(funding_info.0.index as u32, funding_info.1.clone())]);

 ChannelMonitor {
 latest_update_id: 0,
Expand DownExpand Up@@ -1209,7 +1210,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// transaction), which we must learn about spends of via block_connected().
	///
	/// (C-not exported) because we have no HashMap bindings
	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<Script>> {
	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<(u32, Script)>> {
 // If we've detected a counterparty commitment tx on chain, we must include it in the set
 // of outputs to watch for spends of, otherwise we're likely to lose user funds. Because
 // its trivial to do, double-check that here.
Expand DownExpand Up@@ -1264,7 +1265,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// HTLC-Success/HTLC-Timeout transactions.
	/// Return updates for HTLC pending in the channel and failed automatically by the broadcast of
	/// revoked counterparty commitment tx
	fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
	fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
 // Most secp and related errors trying to create keys means we have no hope of constructing
 // a spend transaction...so we return no transactions to broadcast
 let mut claimable_outpoints = Vec::new();
Expand DownExpand Up@@ -1319,7 +1320,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 if !claimable_outpoints.is_empty() || per_commitment_option.is_some() { // ie we're confident this is actually ours
 // We're definitely a counterparty commitment transaction!
 log_trace!(logger, "Got broadcast of revoked counterparty commitment transaction, going to generate general spend tx with {} inputs", claimable_outpoints.len());
 watch_outputs.append(&mut tx.output.clone());
 for (idx, outp) in tx.output.iter().enumerate() {
 watch_outputs.push((idx as u32, outp.clone()));
 }
 self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

 macro_rules! check_htlc_fails {
Expand DownExpand Up@@ -1366,7 +1369,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 // already processed the block, resulting in the counterparty_commitment_txn_on_chain entry
 // not being generated by the above conditional. Thus, to be safe, we go ahead and
 // insert it here.
 watch_outputs.append(&mut tx.output.clone());
 for (idx, outp) in tx.output.iter().enumerate() {
 watch_outputs.push((idx as u32, outp.clone()));
 }
 self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

 log_trace!(logger, "Got broadcast of non-revoked counterparty commitment transaction {}", commitment_txid);
Expand DownExpand Up@@ -1456,7 +1461,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	}

	/// Attempts to claim a counterparty HTLC-Success/HTLC-Timeout's outputs using the revocation key
	fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<TxOut>)>) where L::Target: Logger {
	fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<(u32, TxOut)>)>) where L::Target: Logger {
 let htlc_txid = tx.txid();
 if tx.input.len() != 1 || tx.output.len() != 1 || tx.input[0].witness.len() != 5 {
 return (Vec::new(), None)
Expand All@@ -1478,10 +1483,11 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 log_trace!(logger, "Counterparty HTLC broadcast {}:{}", htlc_txid, 0);
 let witness_data = InputMaterial::Revoked { per_commitment_point, counterparty_delayed_payment_base_key: self.counterparty_tx_cache.counterparty_delayed_payment_base_key, counterparty_htlc_base_key: self.counterparty_tx_cache.counterparty_htlc_base_key, per_commitment_key, input_descriptor: InputDescriptors::RevokedOutput, amount: tx.output[0].value, htlc: None, on_counterparty_tx_csv: self.counterparty_tx_cache.on_counterparty_tx_csv };
 let claimable_outpoints = vec!(ClaimRequest { absolute_timelock: height + self.counterparty_tx_cache.on_counterparty_tx_csv as u32, aggregable: true, outpoint: BitcoinOutPoint { txid: htlc_txid, vout: 0}, witness_data });
 (claimable_outpoints, Some((htlc_txid, tx.output.clone())))
 let outputs = vec![(0, tx.output[0].clone())];
 (claimable_outpoints, Some((htlc_txid, outputs)))
	}

	fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<TxOut>, Option<(Script, PublicKey, PublicKey)>) {
	fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<(u32, TxOut)>, Option<(Script, PublicKey, PublicKey)>) {
 let mut claim_requests = Vec::with_capacity(holder_tx.htlc_outputs.len());
 let mut watch_outputs = Vec::with_capacity(holder_tx.htlc_outputs.len());

Expand All@@ -1502,7 +1508,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 } else { None },
 amount: htlc.amount_msat,
 }});
 watch_outputs.push(commitment_tx.output[transaction_output_index as usize].clone());
 watch_outputs.push((transaction_output_index, commitment_tx.output[transaction_output_index as usize].clone()));
 }
 }

Expand All@@ -1512,7 +1518,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// Attempts to claim any claimable HTLCs in a commitment transaction which was not (yet)
	/// revoked using data in holder_claimable_outpoints.
	/// Should not be used if check_spend_revoked_transaction succeeds.
	fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
	fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
 let commitment_txid = tx.txid();
 let mut claim_requests = Vec::new();
 let mut watch_outputs = Vec::new();
Expand DownExpand Up@@ -1662,7 +1668,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// [`get_outputs_to_watch`].
	///
	/// [`get_outputs_to_watch`]: #method.get_outputs_to_watch
	pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<TxOut>)>
	pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<(u32, TxOut)>)>
 where B::Target: BroadcasterInterface,
 F::Target: FeeEstimator,
 L::Target: Logger,
Expand DownExpand Up@@ -1763,9 +1769,23 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 // Determine new outputs to watch by comparing against previously known outputs to watch,
 // updating the latter in the process.
 watch_outputs.retain(|&(ref txid, ref txouts)| {
 let output_scripts = txouts.iter().map(|o| o.script_pubkey.clone()).collect();
 self.outputs_to_watch.insert(txid.clone(), output_scripts).is_none()
 let idx_and_scripts = txouts.iter().map(|o| (o.0, o.1.script_pubkey.clone())).collect();
 self.outputs_to_watch.insert(txid.clone(), idx_and_scripts).is_none()
@TheBlueMattTheBlueMattOct 15, 2020

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Can we iterate the new watch txn to assert they're known types so that the panic!() two hunks down is definitely correct?
@TheBlueMattTheBlueMattOct 15, 2020

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Actually, its all test-only, it doesnt matter.
 });
 #[cfg(test)]
 {
 // If we see a transaction for which we registered outputs previously,
 // make sure the registered scriptpubkey at the expected index match
 // the actual transaction output one. We failed this case before #653.
 for tx in &txn_matched {
 if let Some(outputs) = self.get_outputs_to_watch().get(&tx.txid()) {
 for idx_and_script in outputs.iter() {
 assert!((idx_and_script.0 as usize) < tx.output.len());
 assert_eq!(tx.output[idx_and_script.0 as usize].script_pubkey, idx_and_script.1);
 }
 }
 }
 }
 watch_outputs
	}

Expand DownExpand Up@@ -1813,8 +1833,19 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	fn spends_watched_output(&self, tx: &Transaction) -> bool {
 for input in tx.input.iter() {
 if let Some(outputs) = self.get_outputs_to_watch().get(&input.previous_output.txid) {
 for (idx, _script_pubkey) in outputs.iter().enumerate() {
 if idx == input.previous_output.vout as usize {
 for (idx, _script_pubkey) in outputs.iter() {
 if *idx == input.previous_output.vout {
 #[cfg(test)]
 {
 // If the expected script is a known type, check that the witness
 // appears to be spending the correct type (ie that the match would
 // actually succeed in BIP 158/159-style filters).
 if _script_pubkey.is_v0_p2wsh() {
 assert_eq!(&bitcoin::Address::p2wsh(&Script::from(input.witness.last().unwrap().clone()), bitcoin::Network::Bitcoin).script_pubkey(), _script_pubkey);
 } else if _script_pubkey.is_v0_p2wpkh() {
 assert_eq!(&bitcoin::Address::p2wpkh(&bitcoin::PublicKey::from_slice(&input.witness.last().unwrap()).unwrap(), bitcoin::Network::Bitcoin).unwrap().script_pubkey(), _script_pubkey);
 } else { panic!(); }
 }
 return true;
 }
 }
Expand DownExpand Up@@ -2316,13 +2347,13 @@ impl<ChanSigner: ChannelKeys + Readable> Readable for (BlockHash, ChannelMonitor
 }

 let outputs_to_watch_len: u64 = Readable::read(reader)?;
 let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<Vec<Script>>())));
 let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<u32>() + mem::size_of::<Vec<Script>>())));
 for _ in 0..outputs_to_watch_len {
 let txid = Readable::read(reader)?;
 let outputs_len: u64 = Readable::read(reader)?;
 let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / mem::size_of::<Script>()));
 let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<u32>() + mem::size_of::<Script>())));
 for _ in 0..outputs_len {
 outputs.push(Readable::read(reader)?);
 outputs.push((Readable::read(reader)?, Readable::read(reader)?));
 }
 if let Some(_) = outputs_to_watch.insert(txid, outputs) {
 return Err(DecodeError::InvalidValue);
Expand Down

101 changes: 47 additions & 54 deletions
lightning/src/ln/functional_tests.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -7157,60 +7157,6 @@ fn test_failure_delay_dust_htlc_local_commitment() {
	do_test_failure_delay_dust_htlc_local_commitment(false);
}

#[test]
fn test_no_failure_dust_htlc_local_commitment() {
	// Transaction filters for failing back dust htlc based on local commitment txn infos has been
	// prone to error, we test here that a dummy transaction don't fail them.

	let chanmon_cfgs = create_chanmon_cfgs(2);
	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
	let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());

	// Rebalance a bit
	send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);

	let as_dust_limit = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;
	let bs_dust_limit = nodes[1].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;

	// We route 2 dust-HTLCs between A and B
	let (preimage_1, _) = route_payment(&nodes[0], &[&nodes[1]], bs_dust_limit*1000);
	let (preimage_2, _) = route_payment(&nodes[1], &[&nodes[0]], as_dust_limit*1000);

	// Build a dummy invalid transaction trying to spend a commitment tx
	let input = TxIn {
 previous_output: BitcoinOutPoint { txid: chan.3.txid(), vout: 0 },
 script_sig: Script::new(),
 sequence: 0,
 witness: Vec::new(),
	};

	let outp = TxOut {
 script_pubkey: Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(),
 value: 10000,
	};

	let dummy_tx = Transaction {
 version: 2,
 lock_time: 0,
 input: vec![input],
 output: vec![outp]
	};

	let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
	nodes[0].chain_monitor.chain_monitor.block_connected(&header, &[(0, &dummy_tx)], 1);
	assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
	assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);
	// We broadcast a few more block to check everything is all right
	connect_blocks(&nodes[0], 20, 1, true, header.block_hash());
	assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
	assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);

	claim_payment(&nodes[0], &vec!(&nodes[1])[..], preimage_1, bs_dust_limit*1000);
	claim_payment(&nodes[1], &vec!(&nodes[0])[..], preimage_2, as_dust_limit*1000);
}

fn do_test_sweep_outbound_htlc_failure_update(revoked: bool, local: bool) {
	// Outbound HTLC-failure updates must be cancelled if we get a reorg before we reach ANTI_REORG_DELAY.
	// Broadcast of revoked remote commitment tx, trigger failure-update of dust/non-dust HTLCs
Expand DownExpand Up@@ -8497,3 +8443,50 @@ fn test_concurrent_monitor_claim() {
 check_spends!(htlc_txn[1], bob_state_y);
	}
}

#[test]
fn test_htlc_no_detection() {
	// This test is a mutation to underscore the detection logic bug we had
 // before #653. HTLC value routed is above the remaining balance, thus
 // inverting HTLC and `to_remote` output. HTLC will come second and
 // it wouldn't be seen by pre-#653 detection as we were enumerate()'ing
 // on a watched outputs vector (Vec<TxOut>) thus implicitly relying on
 // outputs order detection for correct spending children filtring.

 let chanmon_cfgs = create_chanmon_cfgs(2);
 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);

 // Create some initial channels
 let chan_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());

 send_payment(&nodes[0], &vec!(&nodes[1])[..], 1_000_000, 1_000_000);
 let (_, our_payment_hash) = route_payment(&nodes[0], &vec!(&nodes[1])[..], 2_000_000);
 let local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
 assert_eq!(local_txn[0].input.len(), 1);
 assert_eq!(local_txn[0].output.len(), 3);
 check_spends!(local_txn[0], chan_1.3);

 // Timeout HTLC on A's chain and so it can generate a HTLC-Timeout tx
 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
	// We deliberately connect the local tx twice as this should provoke a failure calling
	// this test before #653 fix.
 connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
 check_closed_broadcast!(nodes[0], false);
 check_added_monitors!(nodes[0], 1);

 let htlc_timeout = {
 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
 assert_eq!(node_txn[0].input.len(), 1);
 assert_eq!(node_txn[0].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
 check_spends!(node_txn[0], local_txn[0]);
 node_txn[0].clone()
 };

 let header_201 = BlockHeader { version: 0x20000000, prev_blockhash: header.block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 connect_block(&nodes[0], &Block { header: header_201, txdata: vec![htlc_timeout.clone()] }, 201);
 connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1, 201, true, header_201.block_hash());
 expect_payment_failed!(nodes[0], our_payment_hash, true);
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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 Merged

TheBlueMatt
merged 3 commits into

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Oct 15, 2020
 Merged


Add outpoint index in watch_outputs to fix tracking
#653
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30aad79

Add transaction index in watched_outputs

Jul 1, 2020
613ac6e

Add test_htlc_no_detection

Oct 6, 2020
27ee115

Assert on correct registeration of outputs index

Oct 9, 2020

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8 changes: 4 additions & 4 deletions
lightning/src/chain/chainmonitor.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -95,8 +95,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit

 if let Some(ref chain_source) = self.chain_source {
 for (txid, outputs) in txn_outputs.drain(..) {
 for (idx, output) in outputs.iter().enumerate() {
 chain_source.register_output(&OutPoint { txid, index: idx as u16 }, &output.script_pubkey);
 for (idx, output) in outputs.iter() {
 chain_source.register_output(&OutPoint { txid, index: *idx as u16 }, &output.script_pubkey);
 }
 }
 }
Expand DownExpand Up@@ -152,8 +152,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit
 if let Some(ref chain_source) = self.chain_source {
 chain_source.register_tx(&funding_txo.0.txid, &funding_txo.1);
 for (txid, outputs) in monitor.get_outputs_to_watch().iter() {
 for (idx, script_pubkey) in outputs.iter().enumerate() {
 chain_source.register_output(&OutPoint { txid: *txid, index: idx as u16 }, &script_pubkey);
 for (idx, script_pubkey) in outputs.iter() {
 chain_source.register_output(&OutPoint { txid: *txid, index: *idx as u16 }, script_pubkey);
 }
 }
 }
Expand Down

75 changes: 53 additions & 22 deletions
lightning/src/chain/channelmonitor.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -666,7 +666,7 @@ pub struct ChannelMonitor<ChanSigner: ChannelKeys> {
	// interface knows about the TXOs that we want to be notified of spends of. We could probably
	// be smart and derive them from the above storage fields, but its much simpler and more
	// Obviously Correct (tm) if we just keep track of them explicitly.
	outputs_to_watch: HashMap<Txid, Vec<Script>>,
	outputs_to_watch: HashMap<Txid, Vec<(u32, Script)>>,

	#[cfg(test)]
	pub onchain_tx_handler: OnchainTxHandler<ChanSigner>,
Expand DownExpand Up@@ -914,10 +914,11 @@ impl<ChanSigner: ChannelKeys + Writeable> ChannelMonitor<ChanSigner> {
 }

 (self.outputs_to_watch.len() as u64).write(writer)?;
 for (txid, output_scripts) in self.outputs_to_watch.iter() {
 for (txid, idx_scripts) in self.outputs_to_watch.iter() {
 txid.write(writer)?;
 (output_scripts.len() as u64).write(writer)?;
 for script in output_scripts.iter() {
 (idx_scripts.len() as u64).write(writer)?;
 for (idx, script) in idx_scripts.iter() {
 idx.write(writer)?;
 script.write(writer)?;
 }
 }
Expand DownExpand Up@@ -963,7 +964,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 onchain_tx_handler.provide_latest_holder_tx(initial_holder_commitment_tx);

 let mut outputs_to_watch = HashMap::new();
 outputs_to_watch.insert(funding_info.0.txid, vec![funding_info.1.clone()]);
 outputs_to_watch.insert(funding_info.0.txid, vec![(funding_info.0.index as u32, funding_info.1.clone())]);

 ChannelMonitor {
 latest_update_id: 0,
Expand DownExpand Up@@ -1209,7 +1210,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// transaction), which we must learn about spends of via block_connected().
	///
	/// (C-not exported) because we have no HashMap bindings
	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<Script>> {
	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<(u32, Script)>> {
 // If we've detected a counterparty commitment tx on chain, we must include it in the set
 // of outputs to watch for spends of, otherwise we're likely to lose user funds. Because
 // its trivial to do, double-check that here.
Expand DownExpand Up@@ -1264,7 +1265,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// HTLC-Success/HTLC-Timeout transactions.
	/// Return updates for HTLC pending in the channel and failed automatically by the broadcast of
	/// revoked counterparty commitment tx
	fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
	fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
 // Most secp and related errors trying to create keys means we have no hope of constructing
 // a spend transaction...so we return no transactions to broadcast
 let mut claimable_outpoints = Vec::new();
Expand DownExpand Up@@ -1319,7 +1320,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 if !claimable_outpoints.is_empty() || per_commitment_option.is_some() { // ie we're confident this is actually ours
 // We're definitely a counterparty commitment transaction!
 log_trace!(logger, "Got broadcast of revoked counterparty commitment transaction, going to generate general spend tx with {} inputs", claimable_outpoints.len());
 watch_outputs.append(&mut tx.output.clone());
 for (idx, outp) in tx.output.iter().enumerate() {
 watch_outputs.push((idx as u32, outp.clone()));
 }
 self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

 macro_rules! check_htlc_fails {
Expand DownExpand Up@@ -1366,7 +1369,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 // already processed the block, resulting in the counterparty_commitment_txn_on_chain entry
 // not being generated by the above conditional. Thus, to be safe, we go ahead and
 // insert it here.
 watch_outputs.append(&mut tx.output.clone());
 for (idx, outp) in tx.output.iter().enumerate() {
 watch_outputs.push((idx as u32, outp.clone()));
 }
 self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

 log_trace!(logger, "Got broadcast of non-revoked counterparty commitment transaction {}", commitment_txid);
Expand DownExpand Up@@ -1456,7 +1461,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	}

	/// Attempts to claim a counterparty HTLC-Success/HTLC-Timeout's outputs using the revocation key
	fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<TxOut>)>) where L::Target: Logger {
	fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<(u32, TxOut)>)>) where L::Target: Logger {
 let htlc_txid = tx.txid();
 if tx.input.len() != 1 || tx.output.len() != 1 || tx.input[0].witness.len() != 5 {
 return (Vec::new(), None)
Expand All@@ -1478,10 +1483,11 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 log_trace!(logger, "Counterparty HTLC broadcast {}:{}", htlc_txid, 0);
 let witness_data = InputMaterial::Revoked { per_commitment_point, counterparty_delayed_payment_base_key: self.counterparty_tx_cache.counterparty_delayed_payment_base_key, counterparty_htlc_base_key: self.counterparty_tx_cache.counterparty_htlc_base_key, per_commitment_key, input_descriptor: InputDescriptors::RevokedOutput, amount: tx.output[0].value, htlc: None, on_counterparty_tx_csv: self.counterparty_tx_cache.on_counterparty_tx_csv };
 let claimable_outpoints = vec!(ClaimRequest { absolute_timelock: height + self.counterparty_tx_cache.on_counterparty_tx_csv as u32, aggregable: true, outpoint: BitcoinOutPoint { txid: htlc_txid, vout: 0}, witness_data });
 (claimable_outpoints, Some((htlc_txid, tx.output.clone())))
 let outputs = vec![(0, tx.output[0].clone())];
 (claimable_outpoints, Some((htlc_txid, outputs)))
	}

	fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<TxOut>, Option<(Script, PublicKey, PublicKey)>) {
	fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<(u32, TxOut)>, Option<(Script, PublicKey, PublicKey)>) {
 let mut claim_requests = Vec::with_capacity(holder_tx.htlc_outputs.len());
 let mut watch_outputs = Vec::with_capacity(holder_tx.htlc_outputs.len());

Expand All@@ -1502,7 +1508,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 } else { None },
 amount: htlc.amount_msat,
 }});
 watch_outputs.push(commitment_tx.output[transaction_output_index as usize].clone());
 watch_outputs.push((transaction_output_index, commitment_tx.output[transaction_output_index as usize].clone()));
 }
 }

Expand All@@ -1512,7 +1518,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// Attempts to claim any claimable HTLCs in a commitment transaction which was not (yet)
	/// revoked using data in holder_claimable_outpoints.
	/// Should not be used if check_spend_revoked_transaction succeeds.
	fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
	fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
 let commitment_txid = tx.txid();
 let mut claim_requests = Vec::new();
 let mut watch_outputs = Vec::new();
Expand DownExpand Up@@ -1662,7 +1668,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// [`get_outputs_to_watch`].
	///
	/// [`get_outputs_to_watch`]: #method.get_outputs_to_watch
	pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<TxOut>)>
	pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<(u32, TxOut)>)>
 where B::Target: BroadcasterInterface,
 F::Target: FeeEstimator,
 L::Target: Logger,
Expand DownExpand Up@@ -1763,9 +1769,23 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 // Determine new outputs to watch by comparing against previously known outputs to watch,
 // updating the latter in the process.
 watch_outputs.retain(|&(ref txid, ref txouts)| {
 let output_scripts = txouts.iter().map(|o| o.script_pubkey.clone()).collect();
 self.outputs_to_watch.insert(txid.clone(), output_scripts).is_none()
 let idx_and_scripts = txouts.iter().map(|o| (o.0, o.1.script_pubkey.clone())).collect();
 self.outputs_to_watch.insert(txid.clone(), idx_and_scripts).is_none()
@TheBlueMattTheBlueMattOct 15, 2020

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Can we iterate the new watch txn to assert they're known types so that the panic!() two hunks down is definitely correct?
@TheBlueMattTheBlueMattOct 15, 2020

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Actually, its all test-only, it doesnt matter.
 });
 #[cfg(test)]
 {
 // If we see a transaction for which we registered outputs previously,
 // make sure the registered scriptpubkey at the expected index match
 // the actual transaction output one. We failed this case before #653.
 for tx in &txn_matched {
 if let Some(outputs) = self.get_outputs_to_watch().get(&tx.txid()) {
 for idx_and_script in outputs.iter() {
 assert!((idx_and_script.0 as usize) < tx.output.len());
 assert_eq!(tx.output[idx_and_script.0 as usize].script_pubkey, idx_and_script.1);
 }
 }
 }
 }
 watch_outputs
	}

Expand DownExpand Up@@ -1813,8 +1833,19 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	fn spends_watched_output(&self, tx: &Transaction) -> bool {
 for input in tx.input.iter() {
 if let Some(outputs) = self.get_outputs_to_watch().get(&input.previous_output.txid) {
 for (idx, _script_pubkey) in outputs.iter().enumerate() {
 if idx == input.previous_output.vout as usize {
 for (idx, _script_pubkey) in outputs.iter() {
 if *idx == input.previous_output.vout {
 #[cfg(test)]
 {
 // If the expected script is a known type, check that the witness
 // appears to be spending the correct type (ie that the match would
 // actually succeed in BIP 158/159-style filters).
 if _script_pubkey.is_v0_p2wsh() {
 assert_eq!(&bitcoin::Address::p2wsh(&Script::from(input.witness.last().unwrap().clone()), bitcoin::Network::Bitcoin).script_pubkey(), _script_pubkey);
 } else if _script_pubkey.is_v0_p2wpkh() {
 assert_eq!(&bitcoin::Address::p2wpkh(&bitcoin::PublicKey::from_slice(&input.witness.last().unwrap()).unwrap(), bitcoin::Network::Bitcoin).unwrap().script_pubkey(), _script_pubkey);
 } else { panic!(); }
 }
 return true;
 }
 }
Expand DownExpand Up@@ -2316,13 +2347,13 @@ impl<ChanSigner: ChannelKeys + Readable> Readable for (BlockHash, ChannelMonitor
 }

 let outputs_to_watch_len: u64 = Readable::read(reader)?;
 let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<Vec<Script>>())));
 let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<u32>() + mem::size_of::<Vec<Script>>())));
 for _ in 0..outputs_to_watch_len {
 let txid = Readable::read(reader)?;
 let outputs_len: u64 = Readable::read(reader)?;
 let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / mem::size_of::<Script>()));
 let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<u32>() + mem::size_of::<Script>())));
 for _ in 0..outputs_len {
 outputs.push(Readable::read(reader)?);
 outputs.push((Readable::read(reader)?, Readable::read(reader)?));
 }
 if let Some(_) = outputs_to_watch.insert(txid, outputs) {
 return Err(DecodeError::InvalidValue);
Expand Down

101 changes: 47 additions & 54 deletions
lightning/src/ln/functional_tests.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -7157,60 +7157,6 @@ fn test_failure_delay_dust_htlc_local_commitment() {
	do_test_failure_delay_dust_htlc_local_commitment(false);
}

#[test]
fn test_no_failure_dust_htlc_local_commitment() {
	// Transaction filters for failing back dust htlc based on local commitment txn infos has been
	// prone to error, we test here that a dummy transaction don't fail them.

	let chanmon_cfgs = create_chanmon_cfgs(2);
	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
	let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());

	// Rebalance a bit
	send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);

	let as_dust_limit = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;
	let bs_dust_limit = nodes[1].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;

	// We route 2 dust-HTLCs between A and B
	let (preimage_1, _) = route_payment(&nodes[0], &[&nodes[1]], bs_dust_limit*1000);
	let (preimage_2, _) = route_payment(&nodes[1], &[&nodes[0]], as_dust_limit*1000);

	// Build a dummy invalid transaction trying to spend a commitment tx
	let input = TxIn {
 previous_output: BitcoinOutPoint { txid: chan.3.txid(), vout: 0 },
 script_sig: Script::new(),
 sequence: 0,
 witness: Vec::new(),
	};

	let outp = TxOut {
 script_pubkey: Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(),
 value: 10000,
	};

	let dummy_tx = Transaction {
 version: 2,
 lock_time: 0,
 input: vec![input],
 output: vec![outp]
	};

	let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
	nodes[0].chain_monitor.chain_monitor.block_connected(&header, &[(0, &dummy_tx)], 1);
	assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
	assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);
	// We broadcast a few more block to check everything is all right
	connect_blocks(&nodes[0], 20, 1, true, header.block_hash());
	assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
	assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);

	claim_payment(&nodes[0], &vec!(&nodes[1])[..], preimage_1, bs_dust_limit*1000);
	claim_payment(&nodes[1], &vec!(&nodes[0])[..], preimage_2, as_dust_limit*1000);
}

fn do_test_sweep_outbound_htlc_failure_update(revoked: bool, local: bool) {
	// Outbound HTLC-failure updates must be cancelled if we get a reorg before we reach ANTI_REORG_DELAY.
	// Broadcast of revoked remote commitment tx, trigger failure-update of dust/non-dust HTLCs
Expand DownExpand Up@@ -8497,3 +8443,50 @@ fn test_concurrent_monitor_claim() {
 check_spends!(htlc_txn[1], bob_state_y);
	}
}

#[test]
fn test_htlc_no_detection() {
	// This test is a mutation to underscore the detection logic bug we had
 // before #653. HTLC value routed is above the remaining balance, thus
 // inverting HTLC and `to_remote` output. HTLC will come second and
 // it wouldn't be seen by pre-#653 detection as we were enumerate()'ing
 // on a watched outputs vector (Vec<TxOut>) thus implicitly relying on
 // outputs order detection for correct spending children filtring.

 let chanmon_cfgs = create_chanmon_cfgs(2);
 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);

 // Create some initial channels
 let chan_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());

 send_payment(&nodes[0], &vec!(&nodes[1])[..], 1_000_000, 1_000_000);
 let (_, our_payment_hash) = route_payment(&nodes[0], &vec!(&nodes[1])[..], 2_000_000);
 let local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
 assert_eq!(local_txn[0].input.len(), 1);
 assert_eq!(local_txn[0].output.len(), 3);
 check_spends!(local_txn[0], chan_1.3);

 // Timeout HTLC on A's chain and so it can generate a HTLC-Timeout tx
 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
	// We deliberately connect the local tx twice as this should provoke a failure calling
	// this test before #653 fix.
 connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
 check_closed_broadcast!(nodes[0], false);
 check_added_monitors!(nodes[0], 1);

 let htlc_timeout = {
 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
 assert_eq!(node_txn[0].input.len(), 1);
 assert_eq!(node_txn[0].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
 check_spends!(node_txn[0], local_txn[0]);
 node_txn[0].clone()
 };

 let header_201 = BlockHeader { version: 0x20000000, prev_blockhash: header.block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 connect_block(&nodes[0], &Block { header: header_201, txdata: vec![htlc_timeout.clone()] }, 201);
 connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1, 201, true, header_201.block_hash());
 expect_payment_failed!(nodes[0], our_payment_hash, true);
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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 Merged

TheBlueMatt
merged 3 commits into

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Oct 15, 2020
 Merged


Add outpoint index in watch_outputs to fix tracking
#653
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30aad79

Add transaction index in watched_outputs

Jul 1, 2020
613ac6e

Add test_htlc_no_detection

Oct 6, 2020
27ee115

Assert on correct registeration of outputs index

Oct 9, 2020

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8 changes: 4 additions & 4 deletions
lightning/src/chain/chainmonitor.rs

View file


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Original file line numberDiff line numberDiff line change
Expand Up@@ -95,8 +95,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit

 if let Some(ref chain_source) = self.chain_source {
 for (txid, outputs) in txn_outputs.drain(..) {
 for (idx, output) in outputs.iter().enumerate() {
 chain_source.register_output(&OutPoint { txid, index: idx as u16 }, &output.script_pubkey);
 for (idx, output) in outputs.iter() {
 chain_source.register_output(&OutPoint { txid, index: *idx as u16 }, &output.script_pubkey);
 }
 }
 }
Expand DownExpand Up@@ -152,8 +152,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit
 if let Some(ref chain_source) = self.chain_source {
 chain_source.register_tx(&funding_txo.0.txid, &funding_txo.1);
 for (txid, outputs) in monitor.get_outputs_to_watch().iter() {
 for (idx, script_pubkey) in outputs.iter().enumerate() {
 chain_source.register_output(&OutPoint { txid: *txid, index: idx as u16 }, &script_pubkey);
 for (idx, script_pubkey) in outputs.iter() {
 chain_source.register_output(&OutPoint { txid: *txid, index: *idx as u16 }, script_pubkey);
 }
 }
 }
Expand Down

75 changes: 53 additions & 22 deletions
lightning/src/chain/channelmonitor.rs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -666,7 +666,7 @@ pub struct ChannelMonitor<ChanSigner: ChannelKeys> {
	// interface knows about the TXOs that we want to be notified of spends of. We could probably
	// be smart and derive them from the above storage fields, but its much simpler and more
	// Obviously Correct (tm) if we just keep track of them explicitly.
	outputs_to_watch: HashMap<Txid, Vec<Script>>,
	outputs_to_watch: HashMap<Txid, Vec<(u32, Script)>>,

	#[cfg(test)]
	pub onchain_tx_handler: OnchainTxHandler<ChanSigner>,
Expand DownExpand Up@@ -914,10 +914,11 @@ impl<ChanSigner: ChannelKeys + Writeable> ChannelMonitor<ChanSigner> {
 }

 (self.outputs_to_watch.len() as u64).write(writer)?;
 for (txid, output_scripts) in self.outputs_to_watch.iter() {
 for (txid, idx_scripts) in self.outputs_to_watch.iter() {
 txid.write(writer)?;
 (output_scripts.len() as u64).write(writer)?;
 for script in output_scripts.iter() {
 (idx_scripts.len() as u64).write(writer)?;
 for (idx, script) in idx_scripts.iter() {
 idx.write(writer)?;
 script.write(writer)?;
 }
 }
Expand DownExpand Up@@ -963,7 +964,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 onchain_tx_handler.provide_latest_holder_tx(initial_holder_commitment_tx);

 let mut outputs_to_watch = HashMap::new();
 outputs_to_watch.insert(funding_info.0.txid, vec![funding_info.1.clone()]);
 outputs_to_watch.insert(funding_info.0.txid, vec![(funding_info.0.index as u32, funding_info.1.clone())]);

 ChannelMonitor {
 latest_update_id: 0,
Expand DownExpand Up@@ -1209,7 +1210,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// transaction), which we must learn about spends of via block_connected().
	///
	/// (C-not exported) because we have no HashMap bindings
	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<Script>> {
	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<(u32, Script)>> {
 // If we've detected a counterparty commitment tx on chain, we must include it in the set
 // of outputs to watch for spends of, otherwise we're likely to lose user funds. Because
 // its trivial to do, double-check that here.
Expand DownExpand Up@@ -1264,7 +1265,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// HTLC-Success/HTLC-Timeout transactions.
	/// Return updates for HTLC pending in the channel and failed automatically by the broadcast of
	/// revoked counterparty commitment tx
	fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
	fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
 // Most secp and related errors trying to create keys means we have no hope of constructing
 // a spend transaction...so we return no transactions to broadcast
 let mut claimable_outpoints = Vec::new();
Expand DownExpand Up@@ -1319,7 +1320,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 if !claimable_outpoints.is_empty() || per_commitment_option.is_some() { // ie we're confident this is actually ours
 // We're definitely a counterparty commitment transaction!
 log_trace!(logger, "Got broadcast of revoked counterparty commitment transaction, going to generate general spend tx with {} inputs", claimable_outpoints.len());
 watch_outputs.append(&mut tx.output.clone());
 for (idx, outp) in tx.output.iter().enumerate() {
 watch_outputs.push((idx as u32, outp.clone()));
 }
 self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

 macro_rules! check_htlc_fails {
Expand DownExpand Up@@ -1366,7 +1369,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 // already processed the block, resulting in the counterparty_commitment_txn_on_chain entry
 // not being generated by the above conditional. Thus, to be safe, we go ahead and
 // insert it here.
 watch_outputs.append(&mut tx.output.clone());
 for (idx, outp) in tx.output.iter().enumerate() {
 watch_outputs.push((idx as u32, outp.clone()));
 }
 self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

 log_trace!(logger, "Got broadcast of non-revoked counterparty commitment transaction {}", commitment_txid);
Expand DownExpand Up@@ -1456,7 +1461,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	}

	/// Attempts to claim a counterparty HTLC-Success/HTLC-Timeout's outputs using the revocation key
	fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<TxOut>)>) where L::Target: Logger {
	fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<(u32, TxOut)>)>) where L::Target: Logger {
 let htlc_txid = tx.txid();
 if tx.input.len() != 1 || tx.output.len() != 1 || tx.input[0].witness.len() != 5 {
 return (Vec::new(), None)
Expand All@@ -1478,10 +1483,11 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 log_trace!(logger, "Counterparty HTLC broadcast {}:{}", htlc_txid, 0);
 let witness_data = InputMaterial::Revoked { per_commitment_point, counterparty_delayed_payment_base_key: self.counterparty_tx_cache.counterparty_delayed_payment_base_key, counterparty_htlc_base_key: self.counterparty_tx_cache.counterparty_htlc_base_key, per_commitment_key, input_descriptor: InputDescriptors::RevokedOutput, amount: tx.output[0].value, htlc: None, on_counterparty_tx_csv: self.counterparty_tx_cache.on_counterparty_tx_csv };
 let claimable_outpoints = vec!(ClaimRequest { absolute_timelock: height + self.counterparty_tx_cache.on_counterparty_tx_csv as u32, aggregable: true, outpoint: BitcoinOutPoint { txid: htlc_txid, vout: 0}, witness_data });
 (claimable_outpoints, Some((htlc_txid, tx.output.clone())))
 let outputs = vec![(0, tx.output[0].clone())];
 (claimable_outpoints, Some((htlc_txid, outputs)))
	}

	fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<TxOut>, Option<(Script, PublicKey, PublicKey)>) {
	fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<(u32, TxOut)>, Option<(Script, PublicKey, PublicKey)>) {
 let mut claim_requests = Vec::with_capacity(holder_tx.htlc_outputs.len());
 let mut watch_outputs = Vec::with_capacity(holder_tx.htlc_outputs.len());

Expand All@@ -1502,7 +1508,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 } else { None },
 amount: htlc.amount_msat,
 }});
 watch_outputs.push(commitment_tx.output[transaction_output_index as usize].clone());
 watch_outputs.push((transaction_output_index, commitment_tx.output[transaction_output_index as usize].clone()));
 }
 }

Expand All@@ -1512,7 +1518,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// Attempts to claim any claimable HTLCs in a commitment transaction which was not (yet)
	/// revoked using data in holder_claimable_outpoints.
	/// Should not be used if check_spend_revoked_transaction succeeds.
	fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
	fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
 let commitment_txid = tx.txid();
 let mut claim_requests = Vec::new();
 let mut watch_outputs = Vec::new();
Expand DownExpand Up@@ -1662,7 +1668,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// [`get_outputs_to_watch`].
	///
	/// [`get_outputs_to_watch`]: #method.get_outputs_to_watch
	pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<TxOut>)>
	pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<(u32, TxOut)>)>
 where B::Target: BroadcasterInterface,
 F::Target: FeeEstimator,
 L::Target: Logger,
Expand DownExpand Up@@ -1763,9 +1769,23 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 // Determine new outputs to watch by comparing against previously known outputs to watch,
 // updating the latter in the process.
 watch_outputs.retain(|&(ref txid, ref txouts)| {
 let output_scripts = txouts.iter().map(|o| o.script_pubkey.clone()).collect();
 self.outputs_to_watch.insert(txid.clone(), output_scripts).is_none()
 let idx_and_scripts = txouts.iter().map(|o| (o.0, o.1.script_pubkey.clone())).collect();
 self.outputs_to_watch.insert(txid.clone(), idx_and_scripts).is_none()
@TheBlueMattTheBlueMattOct 15, 2020

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Can we iterate the new watch txn to assert they're known types so that the panic!() two hunks down is definitely correct?
@TheBlueMattTheBlueMattOct 15, 2020

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Actually, its all test-only, it doesnt matter.
 });
 #[cfg(test)]
 {
 // If we see a transaction for which we registered outputs previously,
 // make sure the registered scriptpubkey at the expected index match
 // the actual transaction output one. We failed this case before #653.
 for tx in &txn_matched {
 if let Some(outputs) = self.get_outputs_to_watch().get(&tx.txid()) {
 for idx_and_script in outputs.iter() {
 assert!((idx_and_script.0 as usize) < tx.output.len());
 assert_eq!(tx.output[idx_and_script.0 as usize].script_pubkey, idx_and_script.1);
 }
 }
 }
 }
 watch_outputs
	}

Expand DownExpand Up@@ -1813,8 +1833,19 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	fn spends_watched_output(&self, tx: &Transaction) -> bool {
 for input in tx.input.iter() {
 if let Some(outputs) = self.get_outputs_to_watch().get(&input.previous_output.txid) {
 for (idx, _script_pubkey) in outputs.iter().enumerate() {
 if idx == input.previous_output.vout as usize {
 for (idx, _script_pubkey) in outputs.iter() {
 if *idx == input.previous_output.vout {
 #[cfg(test)]
 {
 // If the expected script is a known type, check that the witness
 // appears to be spending the correct type (ie that the match would
 // actually succeed in BIP 158/159-style filters).
 if _script_pubkey.is_v0_p2wsh() {
 assert_eq!(&bitcoin::Address::p2wsh(&Script::from(input.witness.last().unwrap().clone()), bitcoin::Network::Bitcoin).script_pubkey(), _script_pubkey);
 } else if _script_pubkey.is_v0_p2wpkh() {
 assert_eq!(&bitcoin::Address::p2wpkh(&bitcoin::PublicKey::from_slice(&input.witness.last().unwrap()).unwrap(), bitcoin::Network::Bitcoin).unwrap().script_pubkey(), _script_pubkey);
 } else { panic!(); }
 }
 return true;
 }
 }
Expand DownExpand Up@@ -2316,13 +2347,13 @@ impl<ChanSigner: ChannelKeys + Readable> Readable for (BlockHash, ChannelMonitor
 }

 let outputs_to_watch_len: u64 = Readable::read(reader)?;
 let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<Vec<Script>>())));
 let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<u32>() + mem::size_of::<Vec<Script>>())));
 for _ in 0..outputs_to_watch_len {
 let txid = Readable::read(reader)?;
 let outputs_len: u64 = Readable::read(reader)?;
 let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / mem::size_of::<Script>()));
 let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<u32>() + mem::size_of::<Script>())));
 for _ in 0..outputs_len {
 outputs.push(Readable::read(reader)?);
 outputs.push((Readable::read(reader)?, Readable::read(reader)?));
 }
 if let Some(_) = outputs_to_watch.insert(txid, outputs) {
 return Err(DecodeError::InvalidValue);
Expand Down

101 changes: 47 additions & 54 deletions
lightning/src/ln/functional_tests.rs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -7157,60 +7157,6 @@ fn test_failure_delay_dust_htlc_local_commitment() {
	do_test_failure_delay_dust_htlc_local_commitment(false);
}

#[test]
fn test_no_failure_dust_htlc_local_commitment() {
	// Transaction filters for failing back dust htlc based on local commitment txn infos has been
	// prone to error, we test here that a dummy transaction don't fail them.

	let chanmon_cfgs = create_chanmon_cfgs(2);
	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
	let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());

	// Rebalance a bit
	send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);

	let as_dust_limit = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;
	let bs_dust_limit = nodes[1].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;

	// We route 2 dust-HTLCs between A and B
	let (preimage_1, _) = route_payment(&nodes[0], &[&nodes[1]], bs_dust_limit*1000);
	let (preimage_2, _) = route_payment(&nodes[1], &[&nodes[0]], as_dust_limit*1000);

	// Build a dummy invalid transaction trying to spend a commitment tx
	let input = TxIn {
 previous_output: BitcoinOutPoint { txid: chan.3.txid(), vout: 0 },
 script_sig: Script::new(),
 sequence: 0,
 witness: Vec::new(),
	};

	let outp = TxOut {
 script_pubkey: Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(),
 value: 10000,
	};

	let dummy_tx = Transaction {
 version: 2,
 lock_time: 0,
 input: vec![input],
 output: vec![outp]
	};

	let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
	nodes[0].chain_monitor.chain_monitor.block_connected(&header, &[(0, &dummy_tx)], 1);
	assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
	assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);
	// We broadcast a few more block to check everything is all right
	connect_blocks(&nodes[0], 20, 1, true, header.block_hash());
	assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
	assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);

	claim_payment(&nodes[0], &vec!(&nodes[1])[..], preimage_1, bs_dust_limit*1000);
	claim_payment(&nodes[1], &vec!(&nodes[0])[..], preimage_2, as_dust_limit*1000);
}

fn do_test_sweep_outbound_htlc_failure_update(revoked: bool, local: bool) {
	// Outbound HTLC-failure updates must be cancelled if we get a reorg before we reach ANTI_REORG_DELAY.
	// Broadcast of revoked remote commitment tx, trigger failure-update of dust/non-dust HTLCs
Expand DownExpand Up@@ -8497,3 +8443,50 @@ fn test_concurrent_monitor_claim() {
 check_spends!(htlc_txn[1], bob_state_y);
	}
}

#[test]
fn test_htlc_no_detection() {
	// This test is a mutation to underscore the detection logic bug we had
 // before #653. HTLC value routed is above the remaining balance, thus
 // inverting HTLC and `to_remote` output. HTLC will come second and
 // it wouldn't be seen by pre-#653 detection as we were enumerate()'ing
 // on a watched outputs vector (Vec<TxOut>) thus implicitly relying on
 // outputs order detection for correct spending children filtring.

 let chanmon_cfgs = create_chanmon_cfgs(2);
 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);

 // Create some initial channels
 let chan_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());

 send_payment(&nodes[0], &vec!(&nodes[1])[..], 1_000_000, 1_000_000);
 let (_, our_payment_hash) = route_payment(&nodes[0], &vec!(&nodes[1])[..], 2_000_000);
 let local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
 assert_eq!(local_txn[0].input.len(), 1);
 assert_eq!(local_txn[0].output.len(), 3);
 check_spends!(local_txn[0], chan_1.3);

 // Timeout HTLC on A's chain and so it can generate a HTLC-Timeout tx
 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
	// We deliberately connect the local tx twice as this should provoke a failure calling
	// this test before #653 fix.
 connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
 check_closed_broadcast!(nodes[0], false);
 check_added_monitors!(nodes[0], 1);

 let htlc_timeout = {
 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
 assert_eq!(node_txn[0].input.len(), 1);
 assert_eq!(node_txn[0].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
 check_spends!(node_txn[0], local_txn[0]);
 node_txn[0].clone()
 };

 let header_201 = BlockHeader { version: 0x20000000, prev_blockhash: header.block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 connect_block(&nodes[0], &Block { header: header_201, txdata: vec![htlc_timeout.clone()] }, 201);
 connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1, 201, true, header_201.block_hash());
 expect_payment_failed!(nodes[0], our_payment_hash, true);
}

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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 Merged

TheBlueMatt
merged 3 commits into

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Oct 15, 2020
 Merged


Add outpoint index in watch_outputs to fix tracking
#653
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30aad79

Add transaction index in watched_outputs

Jul 1, 2020
613ac6e

Add test_htlc_no_detection

Oct 6, 2020
27ee115

Assert on correct registeration of outputs index

Oct 9, 2020

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8 changes: 4 additions & 4 deletions
lightning/src/chain/chainmonitor.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -95,8 +95,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit

 if let Some(ref chain_source) = self.chain_source {
 for (txid, outputs) in txn_outputs.drain(..) {
 for (idx, output) in outputs.iter().enumerate() {
 chain_source.register_output(&OutPoint { txid, index: idx as u16 }, &output.script_pubkey);
 for (idx, output) in outputs.iter() {
 chain_source.register_output(&OutPoint { txid, index: *idx as u16 }, &output.script_pubkey);
 }
 }
 }
Expand DownExpand Up@@ -152,8 +152,8 @@ impl<ChanSigner: ChannelKeys, C: Deref, T: Deref, F: Deref, L: Deref> ChainMonit
 if let Some(ref chain_source) = self.chain_source {
 chain_source.register_tx(&funding_txo.0.txid, &funding_txo.1);
 for (txid, outputs) in monitor.get_outputs_to_watch().iter() {
 for (idx, script_pubkey) in outputs.iter().enumerate() {
 chain_source.register_output(&OutPoint { txid: *txid, index: idx as u16 }, &script_pubkey);
 for (idx, script_pubkey) in outputs.iter() {
 chain_source.register_output(&OutPoint { txid: *txid, index: *idx as u16 }, script_pubkey);
 }
 }
 }
Expand Down

75 changes: 53 additions & 22 deletions
lightning/src/chain/channelmonitor.rs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -666,7 +666,7 @@ pub struct ChannelMonitor<ChanSigner: ChannelKeys> {
	// interface knows about the TXOs that we want to be notified of spends of. We could probably
	// be smart and derive them from the above storage fields, but its much simpler and more
	// Obviously Correct (tm) if we just keep track of them explicitly.
	outputs_to_watch: HashMap<Txid, Vec<Script>>,
	outputs_to_watch: HashMap<Txid, Vec<(u32, Script)>>,

	#[cfg(test)]
	pub onchain_tx_handler: OnchainTxHandler<ChanSigner>,
Expand DownExpand Up@@ -914,10 +914,11 @@ impl<ChanSigner: ChannelKeys + Writeable> ChannelMonitor<ChanSigner> {
 }

 (self.outputs_to_watch.len() as u64).write(writer)?;
 for (txid, output_scripts) in self.outputs_to_watch.iter() {
 for (txid, idx_scripts) in self.outputs_to_watch.iter() {
 txid.write(writer)?;
 (output_scripts.len() as u64).write(writer)?;
 for script in output_scripts.iter() {
 (idx_scripts.len() as u64).write(writer)?;
 for (idx, script) in idx_scripts.iter() {
 idx.write(writer)?;
 script.write(writer)?;
 }
 }
Expand DownExpand Up@@ -963,7 +964,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 onchain_tx_handler.provide_latest_holder_tx(initial_holder_commitment_tx);

 let mut outputs_to_watch = HashMap::new();
 outputs_to_watch.insert(funding_info.0.txid, vec![funding_info.1.clone()]);
 outputs_to_watch.insert(funding_info.0.txid, vec![(funding_info.0.index as u32, funding_info.1.clone())]);

 ChannelMonitor {
 latest_update_id: 0,
Expand DownExpand Up@@ -1209,7 +1210,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// transaction), which we must learn about spends of via block_connected().
	///
	/// (C-not exported) because we have no HashMap bindings
	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<Script>> {
	pub fn get_outputs_to_watch(&self) -> &HashMap<Txid, Vec<(u32, Script)>> {
 // If we've detected a counterparty commitment tx on chain, we must include it in the set
 // of outputs to watch for spends of, otherwise we're likely to lose user funds. Because
 // its trivial to do, double-check that here.
Expand DownExpand Up@@ -1264,7 +1265,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// HTLC-Success/HTLC-Timeout transactions.
	/// Return updates for HTLC pending in the channel and failed automatically by the broadcast of
	/// revoked counterparty commitment tx
	fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
	fn check_spend_counterparty_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
 // Most secp and related errors trying to create keys means we have no hope of constructing
 // a spend transaction...so we return no transactions to broadcast
 let mut claimable_outpoints = Vec::new();
Expand DownExpand Up@@ -1319,7 +1320,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 if !claimable_outpoints.is_empty() || per_commitment_option.is_some() { // ie we're confident this is actually ours
 // We're definitely a counterparty commitment transaction!
 log_trace!(logger, "Got broadcast of revoked counterparty commitment transaction, going to generate general spend tx with {} inputs", claimable_outpoints.len());
 watch_outputs.append(&mut tx.output.clone());
 for (idx, outp) in tx.output.iter().enumerate() {
 watch_outputs.push((idx as u32, outp.clone()));
 }
 self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

 macro_rules! check_htlc_fails {
Expand DownExpand Up@@ -1366,7 +1369,9 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 // already processed the block, resulting in the counterparty_commitment_txn_on_chain entry
 // not being generated by the above conditional. Thus, to be safe, we go ahead and
 // insert it here.
 watch_outputs.append(&mut tx.output.clone());
 for (idx, outp) in tx.output.iter().enumerate() {
 watch_outputs.push((idx as u32, outp.clone()));
 }
 self.counterparty_commitment_txn_on_chain.insert(commitment_txid, commitment_number);

 log_trace!(logger, "Got broadcast of non-revoked counterparty commitment transaction {}", commitment_txid);
Expand DownExpand Up@@ -1456,7 +1461,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	}

	/// Attempts to claim a counterparty HTLC-Success/HTLC-Timeout's outputs using the revocation key
	fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<TxOut>)>) where L::Target: Logger {
	fn check_spend_counterparty_htlc<L: Deref>(&mut self, tx: &Transaction, commitment_number: u64, height: u32, logger: &L) -> (Vec<ClaimRequest>, Option<(Txid, Vec<(u32, TxOut)>)>) where L::Target: Logger {
 let htlc_txid = tx.txid();
 if tx.input.len() != 1 || tx.output.len() != 1 || tx.input[0].witness.len() != 5 {
 return (Vec::new(), None)
Expand All@@ -1478,10 +1483,11 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 log_trace!(logger, "Counterparty HTLC broadcast {}:{}", htlc_txid, 0);
 let witness_data = InputMaterial::Revoked { per_commitment_point, counterparty_delayed_payment_base_key: self.counterparty_tx_cache.counterparty_delayed_payment_base_key, counterparty_htlc_base_key: self.counterparty_tx_cache.counterparty_htlc_base_key, per_commitment_key, input_descriptor: InputDescriptors::RevokedOutput, amount: tx.output[0].value, htlc: None, on_counterparty_tx_csv: self.counterparty_tx_cache.on_counterparty_tx_csv };
 let claimable_outpoints = vec!(ClaimRequest { absolute_timelock: height + self.counterparty_tx_cache.on_counterparty_tx_csv as u32, aggregable: true, outpoint: BitcoinOutPoint { txid: htlc_txid, vout: 0}, witness_data });
 (claimable_outpoints, Some((htlc_txid, tx.output.clone())))
 let outputs = vec![(0, tx.output[0].clone())];
 (claimable_outpoints, Some((htlc_txid, outputs)))
	}

	fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<TxOut>, Option<(Script, PublicKey, PublicKey)>) {
	fn broadcast_by_holder_state(&self, commitment_tx: &Transaction, holder_tx: &HolderSignedTx) -> (Vec<ClaimRequest>, Vec<(u32, TxOut)>, Option<(Script, PublicKey, PublicKey)>) {
 let mut claim_requests = Vec::with_capacity(holder_tx.htlc_outputs.len());
 let mut watch_outputs = Vec::with_capacity(holder_tx.htlc_outputs.len());

Expand All@@ -1502,7 +1508,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 } else { None },
 amount: htlc.amount_msat,
 }});
 watch_outputs.push(commitment_tx.output[transaction_output_index as usize].clone());
 watch_outputs.push((transaction_output_index, commitment_tx.output[transaction_output_index as usize].clone()));
 }
 }

Expand All@@ -1512,7 +1518,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// Attempts to claim any claimable HTLCs in a commitment transaction which was not (yet)
	/// revoked using data in holder_claimable_outpoints.
	/// Should not be used if check_spend_revoked_transaction succeeds.
	fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<TxOut>)) where L::Target: Logger {
	fn check_spend_holder_transaction<L: Deref>(&mut self, tx: &Transaction, height: u32, logger: &L) -> (Vec<ClaimRequest>, (Txid, Vec<(u32, TxOut)>)) where L::Target: Logger {
 let commitment_txid = tx.txid();
 let mut claim_requests = Vec::new();
 let mut watch_outputs = Vec::new();
Expand DownExpand Up@@ -1662,7 +1668,7 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	/// [`get_outputs_to_watch`].
	///
	/// [`get_outputs_to_watch`]: #method.get_outputs_to_watch
	pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<TxOut>)>
	pub fn block_connected<B: Deref, F: Deref, L: Deref>(&mut self, header: &BlockHeader, txdata: &TransactionData, height: u32, broadcaster: B, fee_estimator: F, logger: L)-> Vec<(Txid, Vec<(u32, TxOut)>)>
 where B::Target: BroadcasterInterface,
 F::Target: FeeEstimator,
 L::Target: Logger,
Expand DownExpand Up@@ -1763,9 +1769,23 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
 // Determine new outputs to watch by comparing against previously known outputs to watch,
 // updating the latter in the process.
 watch_outputs.retain(|&(ref txid, ref txouts)| {
 let output_scripts = txouts.iter().map(|o| o.script_pubkey.clone()).collect();
 self.outputs_to_watch.insert(txid.clone(), output_scripts).is_none()
 let idx_and_scripts = txouts.iter().map(|o| (o.0, o.1.script_pubkey.clone())).collect();
 self.outputs_to_watch.insert(txid.clone(), idx_and_scripts).is_none()
@TheBlueMattTheBlueMattOct 15, 2020

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Can we iterate the new watch txn to assert they're known types so that the panic!() two hunks down is definitely correct?
@TheBlueMattTheBlueMattOct 15, 2020

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Actually, its all test-only, it doesnt matter.
 });
 #[cfg(test)]
 {
 // If we see a transaction for which we registered outputs previously,
 // make sure the registered scriptpubkey at the expected index match
 // the actual transaction output one. We failed this case before #653.
 for tx in &txn_matched {
 if let Some(outputs) = self.get_outputs_to_watch().get(&tx.txid()) {
 for idx_and_script in outputs.iter() {
 assert!((idx_and_script.0 as usize) < tx.output.len());
 assert_eq!(tx.output[idx_and_script.0 as usize].script_pubkey, idx_and_script.1);
 }
 }
 }
 }
 watch_outputs
	}

Expand DownExpand Up@@ -1813,8 +1833,19 @@ impl<ChanSigner: ChannelKeys> ChannelMonitor<ChanSigner> {
	fn spends_watched_output(&self, tx: &Transaction) -> bool {
 for input in tx.input.iter() {
 if let Some(outputs) = self.get_outputs_to_watch().get(&input.previous_output.txid) {
 for (idx, _script_pubkey) in outputs.iter().enumerate() {
 if idx == input.previous_output.vout as usize {
 for (idx, _script_pubkey) in outputs.iter() {
 if *idx == input.previous_output.vout {
 #[cfg(test)]
 {
 // If the expected script is a known type, check that the witness
 // appears to be spending the correct type (ie that the match would
 // actually succeed in BIP 158/159-style filters).
 if _script_pubkey.is_v0_p2wsh() {
 assert_eq!(&bitcoin::Address::p2wsh(&Script::from(input.witness.last().unwrap().clone()), bitcoin::Network::Bitcoin).script_pubkey(), _script_pubkey);
 } else if _script_pubkey.is_v0_p2wpkh() {
 assert_eq!(&bitcoin::Address::p2wpkh(&bitcoin::PublicKey::from_slice(&input.witness.last().unwrap()).unwrap(), bitcoin::Network::Bitcoin).unwrap().script_pubkey(), _script_pubkey);
 } else { panic!(); }
 }
 return true;
 }
 }
Expand DownExpand Up@@ -2316,13 +2347,13 @@ impl<ChanSigner: ChannelKeys + Readable> Readable for (BlockHash, ChannelMonitor
 }

 let outputs_to_watch_len: u64 = Readable::read(reader)?;
 let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<Vec<Script>>())));
 let mut outputs_to_watch = HashMap::with_capacity(cmp::min(outputs_to_watch_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<Txid>() + mem::size_of::<u32>() + mem::size_of::<Vec<Script>>())));
 for _ in 0..outputs_to_watch_len {
 let txid = Readable::read(reader)?;
 let outputs_len: u64 = Readable::read(reader)?;
 let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / mem::size_of::<Script>()));
 let mut outputs = Vec::with_capacity(cmp::min(outputs_len as usize, MAX_ALLOC_SIZE / (mem::size_of::<u32>() + mem::size_of::<Script>())));
 for _ in 0..outputs_len {
 outputs.push(Readable::read(reader)?);
 outputs.push((Readable::read(reader)?, Readable::read(reader)?));
 }
 if let Some(_) = outputs_to_watch.insert(txid, outputs) {
 return Err(DecodeError::InvalidValue);
Expand Down

101 changes: 47 additions & 54 deletions
lightning/src/ln/functional_tests.rs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -7157,60 +7157,6 @@ fn test_failure_delay_dust_htlc_local_commitment() {
	do_test_failure_delay_dust_htlc_local_commitment(false);
}

#[test]
fn test_no_failure_dust_htlc_local_commitment() {
	// Transaction filters for failing back dust htlc based on local commitment txn infos has been
	// prone to error, we test here that a dummy transaction don't fail them.

	let chanmon_cfgs = create_chanmon_cfgs(2);
	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
	let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
	let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());

	// Rebalance a bit
	send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);

	let as_dust_limit = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;
	let bs_dust_limit = nodes[1].node.channel_state.lock().unwrap().by_id.get(&chan.2).unwrap().holder_dust_limit_satoshis;

	// We route 2 dust-HTLCs between A and B
	let (preimage_1, _) = route_payment(&nodes[0], &[&nodes[1]], bs_dust_limit*1000);
	let (preimage_2, _) = route_payment(&nodes[1], &[&nodes[0]], as_dust_limit*1000);

	// Build a dummy invalid transaction trying to spend a commitment tx
	let input = TxIn {
 previous_output: BitcoinOutPoint { txid: chan.3.txid(), vout: 0 },
 script_sig: Script::new(),
 sequence: 0,
 witness: Vec::new(),
	};

	let outp = TxOut {
 script_pubkey: Builder::new().push_opcode(opcodes::all::OP_RETURN).into_script(),
 value: 10000,
	};

	let dummy_tx = Transaction {
 version: 2,
 lock_time: 0,
 input: vec![input],
 output: vec![outp]
	};

	let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
	nodes[0].chain_monitor.chain_monitor.block_connected(&header, &[(0, &dummy_tx)], 1);
	assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
	assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);
	// We broadcast a few more block to check everything is all right
	connect_blocks(&nodes[0], 20, 1, true, header.block_hash());
	assert_eq!(nodes[0].node.get_and_clear_pending_events().len(), 0);
	assert_eq!(nodes[0].node.get_and_clear_pending_msg_events().len(), 0);

	claim_payment(&nodes[0], &vec!(&nodes[1])[..], preimage_1, bs_dust_limit*1000);
	claim_payment(&nodes[1], &vec!(&nodes[0])[..], preimage_2, as_dust_limit*1000);
}

fn do_test_sweep_outbound_htlc_failure_update(revoked: bool, local: bool) {
	// Outbound HTLC-failure updates must be cancelled if we get a reorg before we reach ANTI_REORG_DELAY.
	// Broadcast of revoked remote commitment tx, trigger failure-update of dust/non-dust HTLCs
Expand DownExpand Up@@ -8497,3 +8443,50 @@ fn test_concurrent_monitor_claim() {
 check_spends!(htlc_txn[1], bob_state_y);
	}
}

#[test]
fn test_htlc_no_detection() {
	// This test is a mutation to underscore the detection logic bug we had
 // before #653. HTLC value routed is above the remaining balance, thus
 // inverting HTLC and `to_remote` output. HTLC will come second and
 // it wouldn't be seen by pre-#653 detection as we were enumerate()'ing
 // on a watched outputs vector (Vec<TxOut>) thus implicitly relying on
 // outputs order detection for correct spending children filtring.

 let chanmon_cfgs = create_chanmon_cfgs(2);
 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);

 // Create some initial channels
 let chan_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 10001, InitFeatures::known(), InitFeatures::known());

 send_payment(&nodes[0], &vec!(&nodes[1])[..], 1_000_000, 1_000_000);
 let (_, our_payment_hash) = route_payment(&nodes[0], &vec!(&nodes[1])[..], 2_000_000);
 let local_txn = get_local_commitment_txn!(nodes[0], chan_1.2);
 assert_eq!(local_txn[0].input.len(), 1);
 assert_eq!(local_txn[0].output.len(), 3);
 check_spends!(local_txn[0], chan_1.3);

 // Timeout HTLC on A's chain and so it can generate a HTLC-Timeout tx
 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
	// We deliberately connect the local tx twice as this should provoke a failure calling
	// this test before #653 fix.
 connect_block(&nodes[0], &Block { header, txdata: vec![local_txn[0].clone()] }, 200);
 check_closed_broadcast!(nodes[0], false);
 check_added_monitors!(nodes[0], 1);

 let htlc_timeout = {
 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
 assert_eq!(node_txn[0].input.len(), 1);
 assert_eq!(node_txn[0].input[0].witness.last().unwrap().len(), OFFERED_HTLC_SCRIPT_WEIGHT);
 check_spends!(node_txn[0], local_txn[0]);
 node_txn[0].clone()
 };

 let header_201 = BlockHeader { version: 0x20000000, prev_blockhash: header.block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 connect_block(&nodes[0], &Block { header: header_201, txdata: vec![htlc_timeout.clone()] }, 201);
 connect_blocks(&nodes[0], ANTI_REORG_DELAY - 1, 201, true, header_201.block_hash());
 expect_payment_failed!(nodes[0], our_payment_hash, true);
}