From d30d599a2f5cfc16568e026d0764396a200d8388 Mon Sep 17 00:00:00 2001 From: Matt Corallo Date: Tue, 31 Oct 2023 18:39:04 +0000 Subject: [PATCH] Drop non-anchor channel fee upper bound limit entirely Quite a while ago we added checks for the total current dust exposure on a channel to explicitly limit dust inflation attacks. When we did this, we kept the existing upper bound on the channel's feerate in place. However, these two things are redundant - the point of the feerate upper bound is to prevent dust inflation, and it does so in a crude way that can cause spurious force-closures. Here we simply drop the upper bound entirely, relying on the dust inflation limit to prevent dust inflation instead. --- fuzz/src/chanmon_consistency.rs | 1 - fuzz/src/full_stack.rs | 4 ++-- lightning/src/chain/chaininterface.rs | 17 -------------- lightning/src/ln/channel.rs | 34 +++------------------------ lightning/src/util/test_utils.rs | 9 ++----- 5 files changed, 7 insertions(+), 58 deletions(-) diff --git a/fuzz/src/chanmon_consistency.rs b/fuzz/src/chanmon_consistency.rs index dddd97cae..074224e56 100644 --- a/fuzz/src/chanmon_consistency.rs +++ b/fuzz/src/chanmon_consistency.rs @@ -80,7 +80,6 @@ impl FeeEstimator for FuzzEstimator { // always return a HighPriority feerate here which is >= the maximum Normal feerate and a // Background feerate which is <= the minimum Normal feerate. match conf_target { - ConfirmationTarget::MaxAllowedNonAnchorChannelRemoteFee => MAX_FEE * 10, ConfirmationTarget::OnChainSweep => MAX_FEE, ConfirmationTarget::ChannelCloseMinimum|ConfirmationTarget::AnchorChannelFee|ConfirmationTarget::MinAllowedAnchorChannelRemoteFee|ConfirmationTarget::MinAllowedNonAnchorChannelRemoteFee => 253, ConfirmationTarget::NonAnchorChannelFee => cmp::min(self.ret_val.load(atomic::Ordering::Acquire), MAX_FEE), diff --git a/fuzz/src/full_stack.rs b/fuzz/src/full_stack.rs index 9ed58dd94..1500a5a8a 100644 --- a/fuzz/src/full_stack.rs +++ b/fuzz/src/full_stack.rs @@ -776,7 +776,7 @@ mod tests { // 030059 - inbound read from peer id 0 of len 89 // 030000000000000000000000000000000000000000000000000000000000000005 020900000000000000000000000000000000000000000000000000000000000000 01 0000 01021000 03000000000000000000000000000000 - rest of open_channel and mac // - // 00fd00fd - Two feerate requests (all returning min feerate, which our open_channel also uses) (gonna be ingested by FuzzEstimator) + // 00fd - Two feerate requests (all returning min feerate, which our open_channel also uses) (gonna be ingested by FuzzEstimator) // - client should now respond with accept_channel (CHECK 1: type 33 to peer 03000000) // // 030012 - inbound read from peer id 0 of len 18 @@ -1033,7 +1033,7 @@ mod tests { // - client now fails the HTLC backwards as it was unable to extract the payment preimage (CHECK 9 duplicate and CHECK 10) let logger = Arc::new(TrackingLogger { lines: Mutex::new(HashMap::new()) }); - 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&(Arc::clone(&logger) as Arc)); + 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&(Arc::clone(&logger) as Arc)); let log_entries = logger.lines.lock().unwrap(); assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling SendAcceptChannel event in peer_handler for node 030000000000000000000000000000000000000000000000000000000000000002 for channel ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb181909679".to_string())), Some(&1)); // 1 diff --git a/lightning/src/chain/chaininterface.rs b/lightning/src/chain/chaininterface.rs index 73707f052..2d7f0c18a 100644 --- a/lightning/src/chain/chaininterface.rs +++ b/lightning/src/chain/chaininterface.rs @@ -53,23 +53,6 @@ pub enum ConfirmationTarget { /// to low hundreds of blocks to get our transaction on-chain, but we shouldn't risk too low a /// fee - this should be a relatively high priority feerate. OnChainSweep, - /// The highest feerate we will allow our channel counterparty to have in a non-anchor channel. - /// - /// This is the feerate on the transaction which we (or our counterparty) will broadcast in - /// order to close the channel unilaterally. Because our counterparty must ensure they can - /// always broadcast the latest state, this value being too low will cause immediate - /// force-closures. - /// - /// Allowing this value to be too high can allow our counterparty to burn our HTLC outputs to - /// dust, which can result in HTLCs failing or force-closures (when the dust HTLCs exceed - /// [`ChannelConfig::max_dust_htlc_exposure`]). - /// - /// Because most nodes use a feerate estimate which is based on a relatively high priority - /// transaction entering the current mempool, setting this to a small multiple of your current - /// high priority feerate estimate should suffice. - /// - /// [`ChannelConfig::max_dust_htlc_exposure`]: crate::util::config::ChannelConfig::max_dust_htlc_exposure - MaxAllowedNonAnchorChannelRemoteFee, /// This is the lowest feerate we will allow our channel counterparty to have in an anchor /// channel in order to close the channel if a channel party goes away. /// diff --git a/lightning/src/ln/channel.rs b/lightning/src/ln/channel.rs index 33a46084a..3606b04e6 100644 --- a/lightning/src/ln/channel.rs +++ b/lightning/src/ln/channel.rs @@ -2162,20 +2162,6 @@ impl Channel where feerate_per_kw: u32, cur_feerate_per_kw: Option, logger: &L ) -> Result<(), ChannelError> where F::Target: FeeEstimator, L::Target: Logger, { - // We only bound the fee updates on the upper side to prevent completely absurd feerates, - // always accepting up to 25 sat/vByte or 10x our fee estimator's "High Priority" fee. - // We generally don't care too much if they set the feerate to something very high, but it - // could result in the channel being useless due to everything being dust. This doesn't - // apply to channels supporting anchor outputs since HTLC transactions are pre-signed with a - // zero fee, so their fee is no longer considered to determine dust limits. - if !channel_type.supports_anchors_zero_fee_htlc_tx() { - let upper_limit = - fee_estimator.bounded_sat_per_1000_weight(ConfirmationTarget::MaxAllowedNonAnchorChannelRemoteFee) as u64; - if feerate_per_kw as u64 > upper_limit { - return Err(ChannelError::Close(format!("Peer's feerate much too high. Actual: {}. Our expected upper limit: {}", feerate_per_kw, upper_limit))); - } - } - let lower_limit_conf_target = if channel_type.supports_anchors_zero_fee_htlc_tx() { ConfirmationTarget::MinAllowedAnchorChannelRemoteFee } else { @@ -3872,14 +3858,11 @@ impl Channel where return Err(ChannelError::Close("Peer sent update_fee when we needed a channel_reestablish".to_owned())); } Channel::::check_remote_fee(&self.context.channel_type, fee_estimator, msg.feerate_per_kw, Some(self.context.feerate_per_kw), logger)?; - let feerate_over_dust_buffer = msg.feerate_per_kw > self.context.get_dust_buffer_feerate(None); self.context.pending_update_fee = Some((msg.feerate_per_kw, FeeUpdateState::RemoteAnnounced)); self.context.update_time_counter += 1; - // If the feerate has increased over the previous dust buffer (note that - // `get_dust_buffer_feerate` considers the `pending_update_fee` status), check that we - // won't be pushed over our dust exposure limit by the feerate increase. - if feerate_over_dust_buffer { + // Check that we won't be pushed over our dust exposure limit by the feerate increase. + if !self.context.channel_type.supports_anchors_zero_fee_htlc_tx() { let inbound_stats = self.context.get_inbound_pending_htlc_stats(None); let outbound_stats = self.context.get_outbound_pending_htlc_stats(None); let holder_tx_dust_exposure = inbound_stats.on_holder_tx_dust_exposure_msat + outbound_stats.on_holder_tx_dust_exposure_msat; @@ -7684,7 +7667,7 @@ mod tests { use crate::ln::PaymentHash; use crate::ln::channelmanager::{self, HTLCSource, PaymentId}; use crate::ln::channel::InitFeatures; - use crate::ln::channel::{Channel, ChannelState, InboundHTLCOutput, OutboundV1Channel, InboundV1Channel, OutboundHTLCOutput, InboundHTLCState, OutboundHTLCState, HTLCCandidate, HTLCInitiator, commit_tx_fee_msat}; + use crate::ln::channel::{ChannelState, InboundHTLCOutput, OutboundV1Channel, InboundV1Channel, OutboundHTLCOutput, InboundHTLCState, OutboundHTLCState, HTLCCandidate, HTLCInitiator, commit_tx_fee_msat}; use crate::ln::channel::{MAX_FUNDING_SATOSHIS_NO_WUMBO, TOTAL_BITCOIN_SUPPLY_SATOSHIS, MIN_THEIR_CHAN_RESERVE_SATOSHIS}; use crate::ln::features::ChannelTypeFeatures; use crate::ln::msgs::{ChannelUpdate, DecodeError, UnsignedChannelUpdate, MAX_VALUE_MSAT}; @@ -7726,17 +7709,6 @@ mod tests { "MAX_FUNDING_SATOSHIS_NO_WUMBO is greater than all satoshis in existence"); } - #[test] - fn test_no_fee_check_overflow() { - // Previously, calling `check_remote_fee` with a fee of 0xffffffff would overflow in - // arithmetic, causing a panic with debug assertions enabled. - let fee_est = TestFeeEstimator { fee_est: 42 }; - let bounded_fee_estimator = LowerBoundedFeeEstimator::new(&fee_est); - assert!(Channel::<&TestKeysInterface>::check_remote_fee( - &ChannelTypeFeatures::only_static_remote_key(), &bounded_fee_estimator, - u32::max_value(), None, &&test_utils::TestLogger::new()).is_err()); - } - struct Keys { signer: InMemorySigner, } diff --git a/lightning/src/util/test_utils.rs b/lightning/src/util/test_utils.rs index d42a84d36..337dfc063 100644 --- a/lightning/src/util/test_utils.rs +++ b/lightning/src/util/test_utils.rs @@ -94,13 +94,8 @@ pub struct TestFeeEstimator { pub sat_per_kw: Mutex, } impl chaininterface::FeeEstimator for TestFeeEstimator { - fn get_est_sat_per_1000_weight(&self, confirmation_target: ConfirmationTarget) -> u32 { - match confirmation_target { - ConfirmationTarget::MaxAllowedNonAnchorChannelRemoteFee => { - core::cmp::max(25 * 250, *self.sat_per_kw.lock().unwrap() * 10) - } - _ => *self.sat_per_kw.lock().unwrap(), - } + fn get_est_sat_per_1000_weight(&self, _confirmation_target: ConfirmationTarget) -> u32 { + *self.sat_per_kw.lock().unwrap() } } -- 2.39.5