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Force-close channels if closing transactions may be non-standard

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If a counterparty (or an old channel of ours) uses a non-segwit
script for their cooperative close payout, they may include an
output which is unbroadcastable due to not meeting the network dust
limit.

Here we check for this condition, force-closing the channel instead
if we find an output in the closing transaction which does not meet
the limit.
This commit is contained in:
Matt Corallo 2021-09-01 20:33:49 +00:00
parent 1b70d9ee8f
commit 9279890089
1 changed files with 6 additions and 0 deletions
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6
lightning/src/ln/channel.rs
View file

@ -3629,6 +3629,12 @@ impl<Signer: Sign> Channel<Signer> {
},
};
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 {