Fix infinite loop when closing a pre-funding channel #2760
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tnull
previously approved these changes
Nov 29, 2023
wpaulino
reviewed
Nov 29, 2023
shaavan
approved these changes
Nov 29, 2023
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Lol I was paying no attention and built this on 0.0.118, rather than git HEAD, rebased now. |
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Codecov ReportAttention:
❗ Your organization needs to install the Codecov GitHub app to enable full functionality. Additional details and impacted files@@ Coverage Diff @@
## main #2760 +/- ##
==========================================
- Coverage 88.52% 88.52% -0.01%
==========================================
Files 115 115
Lines 90996 90999 +3
Branches 90996 90999 +3
==========================================
+ Hits 80557 80558 +1
- Misses 8012 8014 +2
Partials 2427 2427 ☔ View full report in Codecov by Sentry. |
|
Okay, pushed two commits to start to redo the line between funded and unfunded channels yet again, but I think everyone should be happy with this (it was the original idea, and now no longer has the temporary-vs-post-funding-channel-id map key problem). |
dunxen
previously approved these changes
Nov 30, 2023
|
|
||
| /// Handles a funding_signed message from the remote end. | ||
| /// If this call is successful, broadcast the funding transaction (and not before!) | ||
| pub fn funding_signed<L: Deref>( |
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Ok this makes sense for unfunded V1 channels since there's no need to persist the channel before a funding_signed. Also it's great that this is only in outbound now.
It has given me a little more to think about in the V2 case.
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Yea, sorry for the back-and-forth on it, I know we'd discussed this originally but I think I pushed back cause I was annoyed about the different channel id keys.
shaavan
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Dec 3, 2023
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ACK modulo nit
(Adding to my previous review)
Thanks for this great update to the codebase! 🚀
- Handling funding signed from the remote end, is a behavior specific to
OutboundV1Channel, and until the funding sign is handled, theOutboundV1Channelis not yet technically aChannel. - So it makes sense to make this handler part of the
OutboundV1Channelstruct. - Updates to the code are clean and clear, and a few added comments are helpful.
- All the tests of the codebase pass, and hence, there is no broken behavioral change.
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Rebased and addressed feedback: $ git range-diff 4fc3a171152140860440311743178d922c6b7c4b..5db34c58542b06ae8f92d186aab45b43b6d28956 37150b4d697f723f278b6cf3f63892df272b9aa5..3f6e29bd0519dba925992b24455118f1a4e3400d
1: 1de0f5f45 ! 1: c8124e4fb Move to `Funded` after `funding_signed` rather than on funding
@@ lightning/src/ln/channel.rs: impl<SP: Deref> Channel<SP> where
- funding_redeemscript.clone(), self.context.channel_value_satoshis,
- obscure_factor,
- holder_commitment_tx, best_block, self.context.counterparty_node_id);
--
+- let logger_with_chan_monitor = WithChannelMonitor::from(logger, &channel_monitor);
- channel_monitor.provide_initial_counterparty_commitment_tx(
- counterparty_initial_bitcoin_tx.txid, Vec::new(),
- self.context.cur_counterparty_commitment_transaction_number,
- self.context.counterparty_cur_commitment_point.unwrap(),
- counterparty_initial_commitment_tx.feerate_per_kw(),
- counterparty_initial_commitment_tx.to_broadcaster_value_sat(),
-- counterparty_initial_commitment_tx.to_countersignatory_value_sat(), logger);
+- counterparty_initial_commitment_tx.to_countersignatory_value_sat(), &&logger_with_chan_monitor);
-
- assert_eq!(self.context.channel_state & (ChannelState::MonitorUpdateInProgress as u32), 0); // We have no had any monitor(s) yet to fail update!
- if self.context.is_batch_funding() {
@@ lightning/src/ln/channel.rs: impl<SP: Deref> OutboundV1Channel<SP> where SP::Tar
+ Ok(funding_created)
}
-+
fn get_initial_channel_type(config: &UserConfig, their_features: &InitFeatures) -> ChannelTypeFeatures {
- // The default channel type (ie the first one we try) depends on whether the channel is
- // public - if it is, we just go with `only_static_remotekey` as it's the only option
@@ lightning/src/ln/channel.rs: impl<SP: Deref> OutboundV1Channel<SP> where SP::Target: SignerProvider {
Ok(())
@@ lightning/src/ln/channel.rs: impl<SP: Deref> OutboundV1Channel<SP> where SP::Tar
+ funding_redeemscript.clone(), self.context.channel_value_satoshis,
+ obscure_factor,
+ holder_commitment_tx, best_block, self.context.counterparty_node_id);
-+
++ let logger_with_chan_monitor = WithChannelMonitor::from(logger, &channel_monitor);
+ channel_monitor.provide_initial_counterparty_commitment_tx(
+ counterparty_initial_bitcoin_tx.txid, Vec::new(),
+ self.context.cur_counterparty_commitment_transaction_number,
+ self.context.counterparty_cur_commitment_point.unwrap(),
+ counterparty_initial_commitment_tx.feerate_per_kw(),
+ counterparty_initial_commitment_tx.to_broadcaster_value_sat(),
-+ counterparty_initial_commitment_tx.to_countersignatory_value_sat(), logger);
++ counterparty_initial_commitment_tx.to_countersignatory_value_sat(), &&logger_with_chan_monitor);
+
+ assert_eq!(self.context.channel_state & (ChannelState::MonitorUpdateInProgress as u32), 0); // We have no had any monitor(s) yet to fail update!
+ if self.context.is_batch_funding() {
@@ lightning/src/ln/channel.rs: impl<SP: Deref> OutboundV1Channel<SP> where SP::Tar
}
/// A not-yet-funded inbound (from counterparty) channel using V1 channel establishment.
-@@ lightning/src/ln/channel.rs: use crate::ln::channelmanager::{self, HTLCSource, PaymentId};
+@@ lightning/src/ln/channel.rs: mod tests {
value: 10000000, script_pubkey: output_script.clone(),
}]};
let funding_outpoint = OutPoint{ txid: tx.txid(), index: 0 };
@@ lightning/src/ln/channel.rs: use crate::ln::channelmanager::{self, HTLCSource, P
// Put some inbound and outbound HTLCs in A's channel.
let htlc_amount_msat = 11_092_000; // put an amount below A's effective dust limit but above B's.
-@@ lightning/src/ln/channel.rs: use crate::ln::channelmanager::{self, HTLCSource, PaymentId};
+@@ lightning/src/ln/channel.rs: mod tests {
value: 10000000, script_pubkey: output_script.clone(),
}]};
let funding_outpoint = OutPoint{ txid: tx.txid(), index: 0 };
@@ lightning/src/ln/channel.rs: use crate::ln::channelmanager::{self, HTLCSource, P
// Now disconnect the two nodes and check that the commitment point in
// Node B's channel_reestablish message is sane.
-@@ lightning/src/ln/channel.rs: use crate::ln::channelmanager::{self, HTLCSource, PaymentId};
+@@ lightning/src/ln/channel.rs: mod tests {
value: 10000000, script_pubkey: output_script.clone(),
}]};
let funding_outpoint = OutPoint{ txid: tx.txid(), index: 0 };
@@ lightning/src/ln/channel.rs: use crate::ln::channelmanager::{self, HTLCSource, P
// Make sure that receiving a channel update will update the Channel as expected.
let update = ChannelUpdate {
-@@ lightning/src/ln/channel.rs: use crate::ln::channelmanager::{self, HTLCSource, PaymentId};
+@@ lightning/src/ln/channel.rs: mod tests {
},
]};
let funding_outpoint = OutPoint{ txid: tx.txid(), index: 0 };
@@ lightning/src/ln/channel.rs: use crate::ln::channelmanager::{self, HTLCSource, P
).map_err(|_| ()).unwrap();
let (mut node_b_chan, funding_signed_msg, _) = node_b_chan.funding_created(
&funding_created_msg.unwrap(),
-@@ lightning/src/ln/channel.rs: use crate::ln::channelmanager::{self, HTLCSource, PaymentId};
+@@ lightning/src/ln/channel.rs: mod tests {
// Receive funding_signed, but the channel will be configured to hold sending channel_ready and
// broadcasting the funding transaction until the batch is ready.
@@ lightning/src/ln/channelmanager.rs: where
+ Some(ChannelPhase::UnfundedOutboundV1(mut chan)) => {
let funding_txo = find_funding_output(&chan, &funding_transaction)?;
- let funding_res = chan.get_funding_created(funding_transaction, funding_txo, is_batch_funding, &self.logger)
+ let logger = WithChannelContext::from(&self.logger, &chan.context);
@@ lightning/src/ln/channelmanager.rs: where
(chan, MsgHandleErrInternal::from_finish_shutdown(msg, channel_id, user_id, shutdown_res, None, channel_capacity))
} else { unreachable!(); });
@@ lightning/src/ln/channelmanager.rs: where
}
}
Ok(())
+@@ lightning/src/ln/channelmanager.rs: where
+ // We got a temporary failure updating monitor, but will claim the
+ // HTLC when the monitor updating is restored (or on chain).
+ let logger = WithContext::from(&self.logger, None, Some(prev_hop_chan_id));
+- log_error!(self.logger, "Temporary failure claiming HTLC, treating as success: {}", err.err.err);
++ log_error!(logger, "Temporary failure claiming HTLC, treating as success: {}", err.err.err);
+ } else { errs.push((pk, err)); }
+ }
+ }
@@ lightning/src/ln/channelmanager.rs: where
let mut peer_state_lock = peer_state_mutex.lock().unwrap();
let peer_state = &mut *peer_state_lock;
@@ lightning/src/ln/channelmanager.rs: where
- hash_map::Entry::Occupied(mut chan_phase_entry) => {
- match chan_phase_entry.get_mut() {
- ChannelPhase::Funded(ref mut chan) => {
+- let logger = WithChannelContext::from(&self.logger, &chan.context);
- let monitor = try_chan_phase_entry!(self,
-- chan.funding_signed(&msg, best_block, &self.signer_provider, &self.logger), chan_phase_entry);
+- chan.funding_signed(&msg, best_block, &self.signer_provider, &&logger), chan_phase_entry);
- if let Ok(persist_status) = self.chain_monitor.watch_channel(chan.context.get_funding_txo().unwrap(), monitor) {
- handle_new_monitor_update!(self, persist_status, peer_state_lock, peer_state, per_peer_state, chan, INITIAL_MONITOR);
- Ok(())
@@ lightning/src/ln/channelmanager.rs: where
+ hash_map::Entry::Occupied(chan_phase_entry) => {
+ if matches!(chan_phase_entry.get(), ChannelPhase::UnfundedOutboundV1(_)) {
+ let chan = if let ChannelPhase::UnfundedOutboundV1(chan) = chan_phase_entry.remove() { chan } else { unreachable!() };
++ let logger = WithContext::from(
++ &self.logger,
++ Some(chan.context.get_counterparty_node_id()),
++ Some(chan.context.channel_id())
++ );
+ let res =
-+ chan.funding_signed(&msg, best_block, &self.signer_provider, &self.logger);
++ chan.funding_signed(&msg, best_block, &self.signer_provider, &&logger);
+ match res {
+ Ok((chan, monitor)) => {
+ if let Ok(persist_status) = self.chain_monitor.watch_channel(chan.context.get_funding_txo().unwrap(), monitor) {
@@ lightning/src/ln/channelmanager.rs: where
+ Err((chan, e)) => {
+ debug_assert!(matches!(e, ChannelError::Close(_)),
+ "We don't have a channel anymore, so the error better have expected close");
-+ // We've already removed this inbound channel from the map in `PeerState`
-+ // above so at this point we just need to clean up any lingering entries
-+ // concerning this channel as it is safe to do so.
++ // We've already removed this outbound channel from the map in
++ // `PeerState` above so at this point we just need to clean up any
++ // lingering entries concerning this channel as it is safe to do so.
+ return Err(convert_chan_phase_err!(self, e, &mut ChannelPhase::UnfundedOutboundV1(chan), &msg.channel_id).1);
}
- },
2: fc8daa30e ! 2: 973de6f4e Limit the scope of `get_funding_created_msg` to outbound channels
@@ lightning/src/ln/channel.rs: impl<SP: Deref> ChannelContext<SP> where SP::Target
- let signature = match &self.holder_signer {
- // TODO (taproot|arik): move match into calling method for Taproot
- ChannelSignerType::Ecdsa(ecdsa) => {
-- ecdsa.sign_counterparty_commitment(&counterparty_initial_commitment_tx, Vec::new(), &self.secp_ctx)
+- ecdsa.sign_counterparty_commitment(&counterparty_initial_commitment_tx, Vec::new(), Vec::new(), &self.secp_ctx)
- .map(|(sig, _)| sig).ok()?
- },
- // TODO (taproot|arik)
@@ lightning/src/ln/channel.rs: impl<SP: Deref> OutboundV1Channel<SP> where SP::Tar
})
}
-+ /// Only allowed after [`Self::channel_transaction_parameters`] is set.
++ /// Only allowed after [`ChannelContext::channel_transaction_parameters`] is set.
+ fn get_funding_created_msg<L: Deref>(&mut self, logger: &L) -> Option<msgs::FundingCreated> where L::Target: Logger {
+ let counterparty_keys = self.context.build_remote_transaction_keys();
+ let counterparty_initial_commitment_tx = self.context.build_commitment_transaction(self.context.cur_counterparty_commitment_transaction_number, &counterparty_keys, false, false, logger).tx;
+ let signature = match &self.context.holder_signer {
+ // TODO (taproot|arik): move match into calling method for Taproot
+ ChannelSignerType::Ecdsa(ecdsa) => {
-+ ecdsa.sign_counterparty_commitment(&counterparty_initial_commitment_tx, Vec::new(), &self.context.secp_ctx)
++ ecdsa.sign_counterparty_commitment(&counterparty_initial_commitment_tx, Vec::new(), Vec::new(), &self.context.secp_ctx)
+ .map(|(sig, _)| sig).ok()?
+ },
+ // TODO (taproot|arik)
3: 0e264f9df ! 3: bfb503eec Drop unreachable shutdown code in `Channel::get_shutdown`
@@ lightning/src/ln/channel.rs: impl<SP: Deref> Channel<SP> where
- monitor_update: None,
- dropped_outbound_htlcs: Vec::new(),
- unbroadcasted_batch_funding_txid: self.context.unbroadcasted_batch_funding_txid(),
+- channel_id: self.context.channel_id,
+- counterparty_node_id: self.context.counterparty_node_id,
- };
- self.context.channel_state = ChannelState::ShutdownComplete as u32;
- Some(shutdown_result)
4: 80f9d505a = 4: 0d3000520 Move pre-funded-channel immediate shutdown logic to the right place
5: 5db34c585 = 5: 3f6e29bd0 Immediately error in `close_channel_internal` if there is no chan |
wpaulino
previously approved these changes
Dec 5, 2023
|
Needs rebase |
Previously, channels were stored in different maps in `PeerState` based on whether the funding had been set, keeping the keys across the maps consistent (pre-funding temporary_channel_ids vs funding-outpoint-based channel_ids). However, channels are now stored in a single `channel_by_id` map, making that point moot. Instead, here, we convert the `ChannelPhase` state transition boundary to "once we have a `ChannelMonitor`", which makes more sense now, and was actually the original proposed boundary. This also requires calling `signer_maybe_unblocked` on a pre-funded outbound channel, but that nicely also lets us limit the scope of `FundingCreated` message generation, which we do in the next commit.
Since we no longer use `ChannelContext::get_funding_created_msg`, it can be moved back into `UnfundedOutboundV1` channels only, where it realistically belongs.
`Channel` is only a thing for funded channels. Thus, checking if a channel has not yet been funded is dead code and can simply be elided.
Because a `Funded` `Channel` cannot possibly be pre-funding, the
logic in `ChannelManager::close_channel_internal` to handle
pre-funding channels is in the wrong place.
Rather than being handled inside the `Funded` branch, it should be
in an `else` following it, handling either of the two
`ChannelPhases` outside of `Funded`.
Sadly, because of a previous control flow management `loop {}`, the
existing code will infinite loop, which is fixed here.
Previously, unfunded channels would be stored outside of `PeerState::channel_by_id`, and thus if there is no channel when we look in `PeerState::channel_by_id`, `close_channel_internal` called `force_close_channel_with_peer` to hunt for unfunded channels. However, that is no longer the case, so the call is redundant, and we can simply return an error instead.
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Rebased: $ git range-diff 37150b4d697f723f278b6cf3f63892df272b9aa5..3f6e29bd0519dba925992b24455118f1a4e3400d 2d266794c2133782938ce62a96538ef138c85781..5ba4c079bb242f5a0279a36d24ba87e3d8d1d528
1: c8124e4fb ! 1: 6ab56a40b Move to `Funded` after `funding_signed` rather than on funding
@@ lightning/src/ln/channel.rs: pub(super) struct MonitorRestoreUpdates {
}
@@ lightning/src/ln/channel.rs: impl<SP: Deref> Channel<SP> where
+ }
// Message handlers:
-
+-
- /// Handles a funding_signed message from the remote end.
- /// If this call is successful, broadcast the funding transaction (and not before!)
- pub fn funding_signed<L: Deref>(
@@ lightning/src/ln/channel.rs: impl<SP: Deref> Channel<SP> where
- if !self.context.is_outbound() {
- return Err(ChannelError::Close("Received funding_signed for an inbound channel?".to_owned()));
- }
-- if self.context.channel_state & !(ChannelState::MonitorUpdateInProgress as u32) != ChannelState::FundingCreated as u32 {
+- if !matches!(self.context.channel_state, ChannelState::FundingNegotiated) {
- return Err(ChannelError::Close("Received funding_signed in strange state!".to_owned()));
- }
- if self.context.commitment_secrets.get_min_seen_secret() != (1 << 48) ||
@@ lightning/src/ln/channel.rs: impl<SP: Deref> Channel<SP> where
- funding_redeemscript.clone(), self.context.channel_value_satoshis,
- obscure_factor,
- holder_commitment_tx, best_block, self.context.counterparty_node_id);
-- let logger_with_chan_monitor = WithChannelMonitor::from(logger, &channel_monitor);
- channel_monitor.provide_initial_counterparty_commitment_tx(
- counterparty_initial_bitcoin_tx.txid, Vec::new(),
- self.context.cur_counterparty_commitment_transaction_number,
- self.context.counterparty_cur_commitment_point.unwrap(),
- counterparty_initial_commitment_tx.feerate_per_kw(),
- counterparty_initial_commitment_tx.to_broadcaster_value_sat(),
-- counterparty_initial_commitment_tx.to_countersignatory_value_sat(), &&logger_with_chan_monitor);
+- counterparty_initial_commitment_tx.to_countersignatory_value_sat(), logger);
-
-- assert_eq!(self.context.channel_state & (ChannelState::MonitorUpdateInProgress as u32), 0); // We have no had any monitor(s) yet to fail update!
+- assert!(!self.context.channel_state.is_monitor_update_in_progress()); // We have no had any monitor(s) yet to fail update!
- if self.context.is_batch_funding() {
-- self.context.channel_state = ChannelState::FundingSent as u32 | ChannelState::WaitingForBatch as u32;
+- self.context.channel_state = ChannelState::AwaitingChannelReady(AwaitingChannelReadyFlags::WAITING_FOR_BATCH);
- } else {
-- self.context.channel_state = ChannelState::FundingSent as u32;
+- self.context.channel_state = ChannelState::AwaitingChannelReady(AwaitingChannelReadyFlags::new());
- }
- self.context.cur_holder_commitment_transaction_number -= 1;
- self.context.cur_counterparty_commitment_transaction_number -= 1;
@@ lightning/src/ln/channel.rs: impl<SP: Deref> OutboundV1Channel<SP> where SP::Tar
+ if !self.context.is_outbound() {
+ return Err((self, ChannelError::Close("Received funding_signed for an inbound channel?".to_owned())));
+ }
-+ if self.context.channel_state & !(ChannelState::MonitorUpdateInProgress as u32) != ChannelState::FundingCreated as u32 {
++ if !matches!(self.context.channel_state, ChannelState::FundingNegotiated) {
+ return Err((self, ChannelError::Close("Received funding_signed in strange state!".to_owned())));
+ }
+ if self.context.commitment_secrets.get_min_seen_secret() != (1 << 48) ||
@@ lightning/src/ln/channel.rs: impl<SP: Deref> OutboundV1Channel<SP> where SP::Tar
+ funding_redeemscript.clone(), self.context.channel_value_satoshis,
+ obscure_factor,
+ holder_commitment_tx, best_block, self.context.counterparty_node_id);
-+ let logger_with_chan_monitor = WithChannelMonitor::from(logger, &channel_monitor);
+ channel_monitor.provide_initial_counterparty_commitment_tx(
+ counterparty_initial_bitcoin_tx.txid, Vec::new(),
+ self.context.cur_counterparty_commitment_transaction_number,
+ self.context.counterparty_cur_commitment_point.unwrap(),
+ counterparty_initial_commitment_tx.feerate_per_kw(),
+ counterparty_initial_commitment_tx.to_broadcaster_value_sat(),
-+ counterparty_initial_commitment_tx.to_countersignatory_value_sat(), &&logger_with_chan_monitor);
++ counterparty_initial_commitment_tx.to_countersignatory_value_sat(), logger);
+
-+ assert_eq!(self.context.channel_state & (ChannelState::MonitorUpdateInProgress as u32), 0); // We have no had any monitor(s) yet to fail update!
++ assert!(!self.context.channel_state.is_monitor_update_in_progress()); // We have no had any monitor(s) yet to fail update!
+ if self.context.is_batch_funding() {
-+ self.context.channel_state = ChannelState::FundingSent as u32 | ChannelState::WaitingForBatch as u32;
++ self.context.channel_state = ChannelState::AwaitingChannelReady(AwaitingChannelReadyFlags::WAITING_FOR_BATCH);
+ } else {
-+ self.context.channel_state = ChannelState::FundingSent as u32;
++ self.context.channel_state = ChannelState::AwaitingChannelReady(AwaitingChannelReadyFlags::new());
+ }
+ self.context.cur_holder_commitment_transaction_number -= 1;
+ self.context.cur_counterparty_commitment_transaction_number -= 1;
2: 973de6f4e = 2: 8e519b56d Limit the scope of `get_funding_created_msg` to outbound channels
3: bfb503eec ! 3: 1667b4d20 Drop unreachable shutdown code in `Channel::get_shutdown`
@@ lightning/src/ln/channel.rs: impl<SP: Deref> Channel<SP> where
- // If we haven't funded the channel yet, we don't need to bother ensuring the shutdown
- // script is set, we just force-close and call it a day.
- let mut chan_closed = false;
-- if self.context.channel_state & !STATE_FLAGS < ChannelState::FundingSent as u32 {
+- if self.context.channel_state.is_pre_funded_state() {
- chan_closed = true;
- }
-
@@ lightning/src/ln/channel.rs: impl<SP: Deref> Channel<SP> where
// From here on out, we may not fail!
self.context.target_closing_feerate_sats_per_kw = target_feerate_sats_per_kw;
-- let shutdown_result = if self.context.channel_state & !STATE_FLAGS < ChannelState::FundingSent as u32 {
+- let shutdown_result = if self.context.channel_state.is_pre_funded_state() {
- let shutdown_result = ShutdownResult {
- monitor_update: None,
- dropped_outbound_htlcs: Vec::new(),
@@ lightning/src/ln/channel.rs: impl<SP: Deref> Channel<SP> where
- channel_id: self.context.channel_id,
- counterparty_node_id: self.context.counterparty_node_id,
- };
-- self.context.channel_state = ChannelState::ShutdownComplete as u32;
+- self.context.channel_state = ChannelState::ShutdownComplete;
- Some(shutdown_result)
- } else {
-- self.context.channel_state |= ChannelState::LocalShutdownSent as u32;
+- self.context.channel_state.set_local_shutdown_sent();
- None
- };
-+ self.context.channel_state |= ChannelState::LocalShutdownSent as u32;
++ self.context.channel_state.set_local_shutdown_sent();
self.context.update_time_counter += 1;
let monitor_update = if update_shutdown_script {
4: 0d3000520 = 4: 3a2690c8a Move pre-funded-channel immediate shutdown logic to the right place
5: 3f6e29bd0 = 5: 5ba4c079b Immediately error in `close_channel_internal` if there is no chan |
shaavan
approved these changes
Dec 8, 2023
wpaulino
approved these changes
Dec 8, 2023
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Because a
FundedChannelcannot possibly be pre-funding, thelogic in
ChannelManager::close_channel_internalto handlepre-funding channels is in the wrong place.
Rather than being handled inside the
Fundedbranch, it should bein an
elsefollowing it, handling either of the twoChannelPhasesoutside ofFunded.Sadly, because of a previous control flow management
loop {}, theexisting code will infinite loop, which is fixed here.