AaronFiore/electrum
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check dust limits

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* on channel opening we verify that the peer's dust limit is above 354
  sat, the limit for unknown segwit versions
* we constrain the allowed scriptpubkey types for channel closing
* we check that the remote's output is above the relay dust limit for
  the collaborative close case
This commit is contained in:
bitromortac
2021-10-22 12:58:04 +02:00
parent f2f8c4533b
commit 947693c90d
4 changed files with 40 additions and 16 deletions
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7
electrum/lnutil.py
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@@ -40,6 +40,7 @@ COMMITMENT_TX_WEIGHT = 724
HTLC_OUTPUT_WEIGHT = 172
LN_MAX_FUNDING_SAT = pow(2, 24) - 1
DUST_LIMIT_MAX = 1000
# dummy address for fee estimation of funding tx
def ln_dummy_address():
@@ -103,10 +104,10 @@ class ChannelConfig(StoredObject):
raise Exception(f"{conf_name}. insane initial_msat={self.initial_msat}. (funding_sat={funding_sat})")
if self.reserve_sat < self.dust_limit_sat:
raise Exception(f"{conf_name}. MUST set channel_reserve_satoshis greater than or equal to dust_limit_satoshis")
# technically this could be using the lower DUST_LIMIT_DEFAULT_SAT_SEGWIT
# but other implementations are checking against this value too; also let's be conservative
if self.dust_limit_sat < bitcoin.DUST_LIMIT_DEFAULT_SAT_LEGACY:
if self.dust_limit_sat < bitcoin.DUST_LIMIT_UNKNOWN_SEGWIT:
raise Exception(f"{conf_name}. dust limit too low: {self.dust_limit_sat} sat")
if self.dust_limit_sat > DUST_LIMIT_MAX:
raise Exception(f"{conf_name}. dust limit too high: {self.dust_limit_sat} sat")
if self.reserve_sat > funding_sat // 100:
raise Exception(f"{conf_name}. reserve too high: {self.reserve_sat}, funding_sat: {funding_sat}")
if self.htlc_minimum_msat > 1_000: