diff --git a/fuzz/src/full_stack.rs b/fuzz/src/full_stack.rs index d82ff88d9c7..799c2eb8cb9 100644 --- a/fuzz/src/full_stack.rs +++ b/fuzz/src/full_stack.rs @@ -680,7 +680,7 @@ mod tests { // 030012 - inbound read from peer id 0 of len 18 // 0141 03000000000000000000000000000000 - message header indicating message length 321 // 0300fe - inbound read from peer id 0 of len 254 - // 0020 7500000000000000000000000000000000000000000000000000000000000000 ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb181909679 000000000000c350 0000000000000000 000000000000014a ffffffffffffffff 0000000000000222 0000000000000000 000000fd 0006 01e3 030000000000000000000000000000000000000000000000000000000000000001 030000000000000000000000000000000000000000000000000000000000000002 030000000000000000000000000000000000000000000000000000000000000003 030000000000000000000000000000000000000000000000000000000000000004 - beginning of open_channel message + // 0020 7500000000000000000000000000000000000000000000000000000000000000 ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb181909679 000000000000c350 0000000000000000 0000000000000162 ffffffffffffffff 0000000000000222 0000000000000000 000000fd 0006 01e3 030000000000000000000000000000000000000000000000000000000000000001 030000000000000000000000000000000000000000000000000000000000000002 030000000000000000000000000000000000000000000000000000000000000003 030000000000000000000000000000000000000000000000000000000000000004 - beginning of open_channel message // 030053 - inbound read from peer id 0 of len 83 // 030000000000000000000000000000000000000000000000000000000000000005 020900000000000000000000000000000000000000000000000000000000000000 01 03000000000000000000000000000000 - rest of open_channel and mac // @@ -731,7 +731,7 @@ mod tests { // 030112 - inbound read from peer id 1 of len 18 // 0110 01000000000000000000000000000000 - message header indicating message length 272 // 0301ff - inbound read from peer id 1 of len 255 - // 0021 0000000000000000000000000000000000000000000000000000000000000e05 000000000000014a 00000000004c4b40 00000000000003e8 00000000000003e8 00000002 03f0 0005 030000000000000000000000000000000000000000000000000000000000000100 030000000000000000000000000000000000000000000000000000000000000200 030000000000000000000000000000000000000000000000000000000000000300 030000000000000000000000000000000000000000000000000000000000000400 030000000000000000000000000000000000000000000000000000000000000500 02660000000000000000000000000000 - beginning of accept_channel + // 0021 0000000000000000000000000000000000000000000000000000000000000e05 0000000000000162 00000000004c4b40 00000000000003e8 00000000000003e8 00000002 03f0 0005 030000000000000000000000000000000000000000000000000000000000000100 030000000000000000000000000000000000000000000000000000000000000200 030000000000000000000000000000000000000000000000000000000000000300 030000000000000000000000000000000000000000000000000000000000000400 030000000000000000000000000000000000000000000000000000000000000500 02660000000000000000000000000000 - beginning of accept_channel // 030121 - inbound read from peer id 1 of len 33 // 0000000000000000000000000000000000 01000000000000000000000000000000 - rest of accept_channel and mac // @@ -927,7 +927,7 @@ 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)); + super::do_test(&::hex::decode("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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/ln/channel.rs b/lightning/src/ln/channel.rs index 337d95920a8..f412bf2f6e3 100644 --- a/lightning/src/ln/channel.rs +++ b/lightning/src/ln/channel.rs @@ -26,7 +26,7 @@ use ln::{PaymentPreimage, PaymentHash}; use ln::features::{ChannelFeatures, InitFeatures}; use ln::msgs; use ln::msgs::{DecodeError, OptionalField, DataLossProtect}; -use ln::script::ShutdownScript; +use ln::script::{self, ShutdownScript}; use ln::channelmanager::{CounterpartyForwardingInfo, PendingHTLCStatus, HTLCSource, HTLCFailReason, HTLCFailureMsg, PendingHTLCInfo, RAACommitmentOrder, BREAKDOWN_TIMEOUT, MIN_CLTV_EXPIRY_DELTA, MAX_LOCAL_BREAKDOWN_TIMEOUT}; use ln::chan_utils::{CounterpartyCommitmentSecrets, TxCreationKeys, HTLCOutputInCommitment, HTLC_SUCCESS_TX_WEIGHT, HTLC_TIMEOUT_TX_WEIGHT, make_funding_redeemscript, ChannelPublicKeys, CommitmentTransaction, HolderCommitmentTransaction, ChannelTransactionParameters, CounterpartyChannelTransactionParameters, MAX_HTLCS, get_commitment_transaction_number_obscure_factor, ClosingTransaction}; use ln::chan_utils; @@ -44,7 +44,6 @@ use util::scid_utils::scid_from_parts; use io; use prelude::*; use core::{cmp,mem,fmt}; -use core::convert::TryFrom; use core::ops::Deref; #[cfg(any(test, feature = "fuzztarget", debug_assertions))] use sync::Mutex; @@ -555,21 +554,24 @@ pub const ANCHOR_OUTPUT_VALUE_SATOSHI: u64 = 330; /// it's 2^24. pub const MAX_FUNDING_SATOSHIS: u64 = 1 << 24; -/// Maximum counterparty `dust_limit_satoshis` allowed. 2 * standard dust threshold on p2wsh output -/// Scales up on Bitcoin Core's proceeding policy with dust outputs. A typical p2wsh output is 43 -/// bytes to which Core's `GetDustThreshold()` sums up a minimal spend of 67 bytes (even if -/// a p2wsh witnessScript might be *effectively* smaller), `dustRelayFee` is set to 3000sat/kb, thus -/// 110 * 3000 / 1000 = 330. Per-protocol rules, all time-sensitive outputs are p2wsh, a value of -/// 330 sats is the lower bound desired to ensure good propagation of transactions. We give a bit -/// of margin to our counterparty and pick up 660 satoshis as an accepted `dust_limit_satoshis` -/// upper bound to avoid negotiation conflicts with other implementations. -pub const MAX_DUST_LIMIT_SATOSHIS: u64 = 2 * 330; - -/// A typical p2wsh output is 43 bytes to which Core's `GetDustThreshold()` sums up a minimal -/// spend of 67 bytes (even if a p2wsh witnessScript might be *effectively* smaller), `dustRelayFee` -/// is set to 3000sat/kb, thus 110 * 3000 / 1000 = 330. Per-protocol rules, all time-sensitive outputs -/// are p2wsh, a value of 330 sats is the lower bound desired to ensure good propagation of transactions. -pub const MIN_DUST_LIMIT_SATOSHIS: u64 = 330; +/// The maximum network dust limit for standard script formats. This currently represents the +/// minimum output value for a P2SH output before Bitcoin Core 22 considers the entire +/// transaction non-standard and thus refuses to relay it. +/// We also use this as the maximum counterparty `dust_limit_satoshis` allowed, given many +/// implementations use this value for their dust limit today. +pub const MAX_STD_OUTPUT_DUST_LIMIT_SATOSHIS: u64 = 546; + +/// The maximum channel dust limit we will accept from our counterparty. +pub const MAX_CHAN_DUST_LIMIT_SATOSHIS: u64 = MAX_STD_OUTPUT_DUST_LIMIT_SATOSHIS; + +/// The dust limit is used for both the commitment transaction outputs as well as the closing +/// transactions. For cooperative closing transactions, we require segwit outputs, though accept +/// *any* segwit scripts, which are allowed to be up to 42 bytes in length. +/// In order to avoid having to concern ourselves with standardness during the closing process, we +/// simply require our counterparty to use a dust limit which will leave any segwit output +/// standard. +/// See https://github.com/lightningnetwork/lightning-rfc/issues/905 for more details. +pub const MIN_CHAN_DUST_LIMIT_SATOSHIS: u64 = 354; /// Used to return a simple Error back to ChannelManager. Will get converted to a /// msgs::ErrorAction::SendErrorMessage or msgs::ErrorAction::IgnoreError as appropriate with our @@ -636,7 +638,7 @@ impl Channel { return Err(APIError::APIMisuseError {err: format!("Configured with an unreasonable our_to_self_delay ({}) putting user funds at risks", holder_selected_contest_delay)}); } let holder_selected_channel_reserve_satoshis = Channel::::get_holder_selected_channel_reserve_satoshis(channel_value_satoshis); - if holder_selected_channel_reserve_satoshis < MIN_DUST_LIMIT_SATOSHIS { + if holder_selected_channel_reserve_satoshis < MIN_CHAN_DUST_LIMIT_SATOSHIS { return Err(APIError::APIMisuseError { err: format!("Holder selected channel reserve below implemention limit dust_limit_satoshis {}", holder_selected_channel_reserve_satoshis) }); } @@ -707,7 +709,7 @@ impl Channel { feerate_per_kw: feerate, counterparty_dust_limit_satoshis: 0, - holder_dust_limit_satoshis: MIN_DUST_LIMIT_SATOSHIS, + holder_dust_limit_satoshis: MIN_CHAN_DUST_LIMIT_SATOSHIS, counterparty_max_htlc_value_in_flight_msat: 0, counterparty_selected_channel_reserve_satoshis: None, // Filled in in accept_channel counterparty_htlc_minimum_msat: 0, @@ -841,11 +843,11 @@ impl Channel { if msg.max_accepted_htlcs < config.peer_channel_config_limits.min_max_accepted_htlcs { return Err(ChannelError::Close(format!("max_accepted_htlcs ({}) is less than the user specified limit ({})", msg.max_accepted_htlcs, config.peer_channel_config_limits.min_max_accepted_htlcs))); } - if msg.dust_limit_satoshis < MIN_DUST_LIMIT_SATOSHIS { - return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is less than the implementation limit ({})", msg.dust_limit_satoshis, MIN_DUST_LIMIT_SATOSHIS))); + if msg.dust_limit_satoshis < MIN_CHAN_DUST_LIMIT_SATOSHIS { + return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is less than the implementation limit ({})", msg.dust_limit_satoshis, MIN_CHAN_DUST_LIMIT_SATOSHIS))); } - if msg.dust_limit_satoshis > MAX_DUST_LIMIT_SATOSHIS { - return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is greater than the implementation limit ({})", msg.dust_limit_satoshis, MAX_DUST_LIMIT_SATOSHIS))); + if msg.dust_limit_satoshis > MAX_CHAN_DUST_LIMIT_SATOSHIS { + return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is greater than the implementation limit ({})", msg.dust_limit_satoshis, MAX_CHAN_DUST_LIMIT_SATOSHIS))); } // Convert things into internal flags and prep our state: @@ -862,11 +864,11 @@ impl Channel { let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background); let holder_selected_channel_reserve_satoshis = Channel::::get_holder_selected_channel_reserve_satoshis(msg.funding_satoshis); - if holder_selected_channel_reserve_satoshis < MIN_DUST_LIMIT_SATOSHIS { - return Err(ChannelError::Close(format!("Suitable channel reserve not found. remote_channel_reserve was ({}). dust_limit_satoshis is ({}).", holder_selected_channel_reserve_satoshis, MIN_DUST_LIMIT_SATOSHIS))); + if holder_selected_channel_reserve_satoshis < MIN_CHAN_DUST_LIMIT_SATOSHIS { + return Err(ChannelError::Close(format!("Suitable channel reserve not found. remote_channel_reserve was ({}). dust_limit_satoshis is ({}).", holder_selected_channel_reserve_satoshis, MIN_CHAN_DUST_LIMIT_SATOSHIS))); } - if msg.channel_reserve_satoshis < MIN_DUST_LIMIT_SATOSHIS { - return Err(ChannelError::Close(format!("channel_reserve_satoshis ({}) is smaller than our dust limit ({})", msg.channel_reserve_satoshis, MIN_DUST_LIMIT_SATOSHIS))); + if msg.channel_reserve_satoshis < MIN_CHAN_DUST_LIMIT_SATOSHIS { + return Err(ChannelError::Close(format!("channel_reserve_satoshis ({}) is smaller than our dust limit ({})", msg.channel_reserve_satoshis, MIN_CHAN_DUST_LIMIT_SATOSHIS))); } if holder_selected_channel_reserve_satoshis < msg.dust_limit_satoshis { return Err(ChannelError::Close(format!("Dust limit ({}) too high for the channel reserve we require the remote to keep ({})", msg.dust_limit_satoshis, holder_selected_channel_reserve_satoshis))); @@ -893,10 +895,10 @@ impl Channel { if script.len() == 0 { None } else { - match ShutdownScript::try_from((script.clone(), their_features)) { - Ok(shutdown_script) => Some(shutdown_script.into_inner()), - Err(_) => return Err(ChannelError::Close(format!("Peer is signaling upfront_shutdown but has provided an unacceptable scriptpubkey format: {}", script))), + if !script::is_bolt2_compliant(&script, their_features) { + return Err(ChannelError::Close(format!("Peer is signaling upfront_shutdown but has provided an unacceptable scriptpubkey format: {}", script))) } + Some(script.clone()) } }, // Peer is signaling upfront shutdown but don't opt-out with correct mechanism (a.k.a 0-length script). Peer looks buggy, we fail the channel @@ -971,7 +973,7 @@ impl Channel { feerate_per_kw: msg.feerate_per_kw, channel_value_satoshis: msg.funding_satoshis, counterparty_dust_limit_satoshis: msg.dust_limit_satoshis, - holder_dust_limit_satoshis: MIN_DUST_LIMIT_SATOSHIS, + holder_dust_limit_satoshis: MIN_CHAN_DUST_LIMIT_SATOSHIS, counterparty_max_htlc_value_in_flight_msat: cmp::min(msg.max_htlc_value_in_flight_msat, msg.funding_satoshis * 1000), counterparty_selected_channel_reserve_satoshis: Some(msg.channel_reserve_satoshis), counterparty_htlc_minimum_msat: msg.htlc_minimum_msat, @@ -1615,11 +1617,11 @@ impl Channel { if msg.max_accepted_htlcs < config.peer_channel_config_limits.min_max_accepted_htlcs { return Err(ChannelError::Close(format!("max_accepted_htlcs ({}) is less than the user specified limit ({})", msg.max_accepted_htlcs, config.peer_channel_config_limits.min_max_accepted_htlcs))); } - if msg.dust_limit_satoshis < MIN_DUST_LIMIT_SATOSHIS { - return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is less than the implementation limit ({})", msg.dust_limit_satoshis, MIN_DUST_LIMIT_SATOSHIS))); + if msg.dust_limit_satoshis < MIN_CHAN_DUST_LIMIT_SATOSHIS { + return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is less than the implementation limit ({})", msg.dust_limit_satoshis, MIN_CHAN_DUST_LIMIT_SATOSHIS))); } - if msg.dust_limit_satoshis > MAX_DUST_LIMIT_SATOSHIS { - return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is greater than the implementation limit ({})", msg.dust_limit_satoshis, MAX_DUST_LIMIT_SATOSHIS))); + if msg.dust_limit_satoshis > MAX_CHAN_DUST_LIMIT_SATOSHIS { + return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is greater than the implementation limit ({})", msg.dust_limit_satoshis, MAX_CHAN_DUST_LIMIT_SATOSHIS))); } if msg.minimum_depth > config.peer_channel_config_limits.max_minimum_depth { return Err(ChannelError::Close(format!("We consider the minimum depth to be unreasonably large. Expected minimum: ({}). Actual: ({})", config.peer_channel_config_limits.max_minimum_depth, msg.minimum_depth))); @@ -1638,10 +1640,10 @@ impl Channel { if script.len() == 0 { None } else { - match ShutdownScript::try_from((script.clone(), their_features)) { - Ok(shutdown_script) => Some(shutdown_script.into_inner()), - Err(_) => return Err(ChannelError::Close(format!("Peer is signaling upfront_shutdown but has provided an unacceptable scriptpubkey format: {}", script))), + if !script::is_bolt2_compliant(&script, their_features) { + return Err(ChannelError::Close(format!("Peer is signaling upfront_shutdown but has provided an unacceptable scriptpubkey format: {}", script))); } + Some(script.clone()) } }, // Peer is signaling upfront shutdown but don't opt-out with correct mechanism (a.k.a 0-length script). Peer looks buggy, we fail the channel @@ -3491,17 +3493,16 @@ impl Channel { } assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0); - let shutdown_scriptpubkey = match ShutdownScript::try_from((msg.scriptpubkey.clone(), their_features)) { - Ok(script) => script.into_inner(), - Err(_) => return Err(ChannelError::Close(format!("Got a nonstandard scriptpubkey ({}) from remote peer", msg.scriptpubkey.to_bytes().to_hex()))), - }; + if !script::is_bolt2_compliant(&msg.scriptpubkey, their_features) { + return Err(ChannelError::Close(format!("Got a nonstandard scriptpubkey ({}) from remote peer", msg.scriptpubkey.to_bytes().to_hex()))); + } if self.counterparty_shutdown_scriptpubkey.is_some() { - if Some(&shutdown_scriptpubkey) != self.counterparty_shutdown_scriptpubkey.as_ref() { - return Err(ChannelError::Close(format!("Got shutdown request with a scriptpubkey ({}) which did not match their previous scriptpubkey.", shutdown_scriptpubkey.to_bytes().to_hex()))); + if Some(&msg.scriptpubkey) != self.counterparty_shutdown_scriptpubkey.as_ref() { + return Err(ChannelError::Close(format!("Got shutdown request with a scriptpubkey ({}) which did not match their previous scriptpubkey.", msg.scriptpubkey.to_bytes().to_hex()))); } } else { - self.counterparty_shutdown_scriptpubkey = Some(shutdown_scriptpubkey); + self.counterparty_shutdown_scriptpubkey = Some(msg.scriptpubkey.clone()); } // If we have any LocalAnnounced updates we'll probably just get back an update_fail_htlc @@ -3628,6 +3629,12 @@ impl Channel { }, }; + for outp in closing_tx.trust().built_transaction().output.iter() { + if !outp.script_pubkey.is_witness_program() && outp.value < MAX_STD_OUTPUT_DUST_LIMIT_SATOSHIS { + return Err(ChannelError::Close("Remote sent us a closing_signed with a dust output. Always use segwit closing scripts!".to_owned())); + } + } + assert!(self.shutdown_scriptpubkey.is_some()); if let Some((last_fee, sig)) = self.last_sent_closing_fee { if last_fee == msg.fee_satoshis { diff --git a/lightning/src/ln/functional_tests.rs b/lightning/src/ln/functional_tests.rs index e1a57cd7cc1..e6529415f2a 100644 --- a/lightning/src/ln/functional_tests.rs +++ b/lightning/src/ln/functional_tests.rs @@ -1480,7 +1480,7 @@ fn test_chan_reserve_dust_inbound_htlcs_outbound_chan() { push_amt -= Channel::::get_holder_selected_channel_reserve_satoshis(100_000) * 1000; create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, push_amt, InitFeatures::known(), InitFeatures::known()); - let dust_amt = crate::ln::channel::MIN_DUST_LIMIT_SATOSHIS * 1000 + let dust_amt = crate::ln::channel::MIN_CHAN_DUST_LIMIT_SATOSHIS * 1000 + feerate_per_kw as u64 * HTLC_SUCCESS_TX_WEIGHT / 1000 * 1000 - 1; // In the previous code, routing this dust payment would cause nodes[0] to perceive a channel // reserve violation even though it's a dust HTLC and therefore shouldn't count towards the @@ -5830,7 +5830,7 @@ fn bolt2_open_channel_sane_dust_limit() { let push_msat=10001; nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), channel_value_satoshis, push_msat, 42, None).unwrap(); let mut node0_to_1_send_open_channel = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id()); - node0_to_1_send_open_channel.dust_limit_satoshis = 661; + node0_to_1_send_open_channel.dust_limit_satoshis = 547; node0_to_1_send_open_channel.channel_reserve_satoshis = 100001; nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &node0_to_1_send_open_channel); @@ -5841,7 +5841,7 @@ fn bolt2_open_channel_sane_dust_limit() { }, _ => panic!("Unexpected event"), }; - assert_eq!(err_msg.data, "dust_limit_satoshis (661) is greater than the implementation limit (660)"); + assert_eq!(err_msg.data, "dust_limit_satoshis (547) is greater than the implementation limit (546)"); } // Test that if we fail to send an HTLC that is being freed from the holding cell, and the HTLC @@ -9069,116 +9069,3 @@ fn test_keysend_payments_to_private_node() { pass_along_path(&nodes[0], &path, 10000, payment_hash, None, event, true, Some(test_preimage)); claim_payment(&nodes[0], &path, test_preimage); } - -fn do_test_max_dust_htlc_exposure(dust_outbound_balance: bool, at_forward: bool, on_holder_tx: bool) { - // Test that we properly reject dust HTLC violating our `max_dust_htlc_exposure_msat` policy. - // - // At HTLC forward (`send_payment()`), if the sum of the trimmed-to-dust HTLC inbound and - // trimmed-to-dust HTLC outbound balance and this new payment as included on next counterparty - // commitment are above our `max_dust_htlc_exposure_msat`, we'll reject the update. - // At HTLC reception (`update_add_htlc()`), if the sum of the trimmed-to-dust HTLC inbound - // and trimmed-to-dust HTLC outbound balance and this new received HTLC as included on next - // counterparty commitment are above our `max_dust_htlc_exposure_msat`, we'll fail the update. - // Note, we return a `temporary_channel_failure` (0x1000 | 7), as the channel might be - // available again for HTLC processing once the dust bandwidth has cleared up. - - let chanmon_cfgs = create_chanmon_cfgs(2); - let mut config = test_default_channel_config(); - config.channel_options.max_dust_htlc_exposure_msat = 5_000_000; // default setting value - let node_cfgs = create_node_cfgs(2, &chanmon_cfgs); - let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, Some(config)]); - let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs); - - nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 1_000_000, 500_000_000, 42, None).unwrap(); - let mut open_channel = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id()); - open_channel.max_htlc_value_in_flight_msat = 50_000_000; - open_channel.max_accepted_htlcs = 60; - nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &open_channel); - let mut accept_channel = get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id()); - if on_holder_tx { - accept_channel.dust_limit_satoshis = 660; - } - nodes[0].node.handle_accept_channel(&nodes[1].node.get_our_node_id(), InitFeatures::known(), &accept_channel); - - let (temporary_channel_id, tx, _) = create_funding_transaction(&nodes[0], 1_000_000, 42); - - if on_holder_tx { - if let Some(mut chan) = nodes[1].node.channel_state.lock().unwrap().by_id.get_mut(&temporary_channel_id) { - chan.holder_dust_limit_satoshis = 660; - } - } - - nodes[0].node.funding_transaction_generated(&temporary_channel_id, tx.clone()).unwrap(); - nodes[1].node.handle_funding_created(&nodes[0].node.get_our_node_id(), &get_event_msg!(nodes[0], MessageSendEvent::SendFundingCreated, nodes[1].node.get_our_node_id())); - check_added_monitors!(nodes[1], 1); - - nodes[0].node.handle_funding_signed(&nodes[1].node.get_our_node_id(), &get_event_msg!(nodes[1], MessageSendEvent::SendFundingSigned, nodes[0].node.get_our_node_id())); - check_added_monitors!(nodes[0], 1); - - let (funding_locked, _) = create_chan_between_nodes_with_value_confirm(&nodes[0], &nodes[1], &tx); - let (announcement, as_update, bs_update) = create_chan_between_nodes_with_value_b(&nodes[0], &nodes[1], &funding_locked); - update_nodes_with_chan_announce(&nodes, 0, 1, &announcement, &as_update, &bs_update); - - if on_holder_tx { - if dust_outbound_balance { - for i in 0..2 { - let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], 2_300_000); - if let Err(_) = nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)) { panic!("Unexpected event at dust HTLC {}", i); } - } - } else { - for _ in 0..2 { - route_payment(&nodes[0], &[&nodes[1]], 2_300_000); - } - } - } else { - if dust_outbound_balance { - for i in 0..25 { - let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], 200_000); // + 177_000 msat of HTLC-success tx at 253 sats/kWU - if let Err(_) = nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)) { panic!("Unexpected event at dust HTLC {}", i); } - } - } else { - for _ in 0..25 { - route_payment(&nodes[0], &[&nodes[1]], 200_000); // + 167_000 msat of HTLC-timeout tx at 253 sats/kWU - } - } - } - - if at_forward { - let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], if on_holder_tx { 2_300_000 } else { 200_000 }); - let mut config = UserConfig::default(); - if on_holder_tx { - unwrap_send_err!(nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)), true, APIError::ChannelUnavailable { ref err }, assert_eq!(err, &format!("Cannot send value that would put our exposure to dust HTLCs at {} over the limit {} on holder commitment tx", 6_900_000, config.channel_options.max_dust_htlc_exposure_msat))); - } else { - unwrap_send_err!(nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)), true, APIError::ChannelUnavailable { ref err }, assert_eq!(err, &format!("Cannot send value that would put our exposure to dust HTLCs at {} over the limit {} on counterparty commitment tx", 5_200_000, config.channel_options.max_dust_htlc_exposure_msat))); - } - } else { - let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1 ], if on_holder_tx { 2_300_000 } else { 200_000 }); - nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap(); - check_added_monitors!(nodes[0], 1); - let mut events = nodes[0].node.get_and_clear_pending_msg_events(); - assert_eq!(events.len(), 1); - let payment_event = SendEvent::from_event(events.remove(0)); - nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]); - if on_holder_tx { - nodes[1].logger.assert_log("lightning::ln::channel".to_string(), format!("Cannot accept value that would put our exposure to dust HTLCs at {} over the limit {} on holder commitment tx", 6_900_000, config.channel_options.max_dust_htlc_exposure_msat), 1); - } else { - nodes[1].logger.assert_log("lightning::ln::channel".to_string(), format!("Cannot accept value that would put our exposure to dust HTLCs at {} over the limit {} on counterparty commitment tx", 5_200_000, config.channel_options.max_dust_htlc_exposure_msat), 1); - } - } - - let _ = nodes[1].node.get_and_clear_pending_msg_events(); - let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap(); - added_monitors.clear(); -} - -#[test] -fn test_max_dust_htlc_exposure() { - do_test_max_dust_htlc_exposure(true, true, true); - do_test_max_dust_htlc_exposure(false, true, true); - do_test_max_dust_htlc_exposure(false, false, true); - do_test_max_dust_htlc_exposure(false, false, false); - do_test_max_dust_htlc_exposure(true, true, false); - do_test_max_dust_htlc_exposure(true, false, false); - do_test_max_dust_htlc_exposure(true, false, true); - do_test_max_dust_htlc_exposure(false, true, false); -} diff --git a/lightning/src/ln/script.rs b/lightning/src/ln/script.rs index 4e81d76ad67..00ad48bb1e3 100644 --- a/lightning/src/ln/script.rs +++ b/lightning/src/ln/script.rs @@ -3,7 +3,7 @@ use bitcoin::blockdata::opcodes::all::OP_PUSHBYTES_0 as SEGWIT_V0; use bitcoin::blockdata::script::{Builder, Script}; use bitcoin::hashes::Hash; -use bitcoin::hash_types::{PubkeyHash, ScriptHash, WPubkeyHash, WScriptHash}; +use bitcoin::hash_types::{WPubkeyHash, WScriptHash}; use bitcoin::secp256k1::key::PublicKey; use ln::features::InitFeatures; @@ -66,16 +66,6 @@ impl ShutdownScript { Self(ShutdownScriptImpl::Legacy(pubkey)) } - /// Generates a P2PKH script pubkey from the given [`PubkeyHash`]. - pub fn new_p2pkh(pubkey_hash: &PubkeyHash) -> Self { - Self(ShutdownScriptImpl::Bolt2(Script::new_p2pkh(pubkey_hash))) - } - - /// Generates a P2SH script pubkey from the given [`ScriptHash`]. - pub fn new_p2sh(script_hash: &ScriptHash) -> Self { - Self(ShutdownScriptImpl::Bolt2(Script::new_p2sh(script_hash))) - } - /// Generates a P2WPKH script pubkey from the given [`WPubkeyHash`]. pub fn new_p2wpkh(pubkey_hash: &WPubkeyHash) -> Self { Self(ShutdownScriptImpl::Bolt2(Script::new_v0_wpkh(pubkey_hash))) @@ -126,7 +116,9 @@ impl ShutdownScript { } } -fn is_bolt2_compliant(script: &Script, features: &InitFeatures) -> bool { +/// Check if a given script is compliant with BOLT 2's shutdown script requirements for the given +/// counterparty features. +pub(crate) fn is_bolt2_compliant(script: &Script, features: &InitFeatures) -> bool { if script.is_p2pkh() || script.is_p2sh() || script.is_v0_p2wpkh() || script.is_v0_p2wsh() { true } else if features.supports_shutdown_anysegwit() { @@ -136,6 +128,8 @@ fn is_bolt2_compliant(script: &Script, features: &InitFeatures) -> bool { } } +// Note that this is only for our own shutdown scripts. Counterparties are still allowed to send us +// non-witness shutdown scripts which this rejects. impl TryFrom