AaronFiore/electrum
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implement option_shutdown_anysegwit

Browse Source 
https://github.com/lightningnetwork/lightning-rfc/pull/672

We check the received shutdown script against higher segwit versions and
accept closing to that script if option_shutdown_anysegwit has been
negotiated.
This commit is contained in:
bitromortac
2021-10-22 11:59:44 +02:00
parent 5c91212fab
commit f2f8c4533b
5 changed files with 55 additions and 8 deletions
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22
electrum/lnpeer.py
View File

@@ -495,6 +495,9 @@ class Peer(Logger):
self.lnworker.peer_closed(self)
self.got_disconnected.set()
def is_shutdown_anysegwit(self):
return self.features.supports(LnFeatures.OPTION_SHUTDOWN_ANYSEGWIT_OPT)
def is_static_remotekey(self):
return self.features.supports(LnFeatures.OPTION_STATIC_REMOTEKEY_OPT)
@@ -1692,11 +1695,20 @@ class Peer(Logger):
if their_upfront_scriptpubkey:
if not (their_scriptpubkey == their_upfront_scriptpubkey):
raise UpfrontShutdownScriptViolation("remote didn't use upfront shutdown script it commited to in channel opening")
# BOLT-02 restrict the scriptpubkey to some templates:
if not (match_script_against_template(their_scriptpubkey, transaction.SCRIPTPUBKEY_TEMPLATE_WITNESS_V0)
or match_script_against_template(their_scriptpubkey, transaction.SCRIPTPUBKEY_TEMPLATE_P2SH)
or match_script_against_template(their_scriptpubkey, transaction.SCRIPTPUBKEY_TEMPLATE_P2PKH)):
raise Exception(f'scriptpubkey in received shutdown message does not conform to any template: {their_scriptpubkey.hex()}')
else:
# BOLT-02 restrict the scriptpubkey to some templates:
# order by decreasing dust limit
if match_script_against_template(their_scriptpubkey, transaction.SCRIPTPUBKEY_TEMPLATE_P2PKH):
pass
elif match_script_against_template(their_scriptpubkey, transaction.SCRIPTPUBKEY_TEMPLATE_P2SH):
pass
elif self.is_shutdown_anysegwit() and match_script_against_template(their_scriptpubkey, transaction.SCRIPTPUBKEY_TEMPLATE_ANYSEGWIT):
pass
elif match_script_against_template(their_scriptpubkey, transaction.SCRIPTPUBKEY_TEMPLATE_WITNESS_V0):
pass
else:
raise Exception(f'scriptpubkey in received shutdown message does not conform to any template: {their_scriptpubkey.hex()}')
chan_id = chan.channel_id
if chan_id in self.shutdown_received:
self.shutdown_received[chan_id].set_result(payload)

7
electrum/lnutil.py
View File

@@ -1026,6 +1026,12 @@ class LnFeatures(IntFlag):
_ln_feature_contexts[OPTION_TRAMPOLINE_ROUTING_REQ] = (LNFC.INIT | LNFC.NODE_ANN | LNFC.INVOICE)
_ln_feature_contexts[OPTION_TRAMPOLINE_ROUTING_OPT] = (LNFC.INIT | LNFC.NODE_ANN | LNFC.INVOICE)
OPTION_SHUTDOWN_ANYSEGWIT_REQ = 1 << 26
OPTION_SHUTDOWN_ANYSEGWIT_OPT = 1 << 27
_ln_feature_contexts[OPTION_SHUTDOWN_ANYSEGWIT_REQ] = (LNFC.INIT | LNFC.NODE_ANN)
_ln_feature_contexts[OPTION_SHUTDOWN_ANYSEGWIT_OPT] = (LNFC.INIT | LNFC.NODE_ANN)
# temporary
OPTION_TRAMPOLINE_ROUTING_REQ_ECLAIR = 1 << 50
OPTION_TRAMPOLINE_ROUTING_OPT_ECLAIR = 1 << 51
@@ -1114,6 +1120,7 @@ LN_FEATURES_IMPLEMENTED = (
| LnFeatures.PAYMENT_SECRET_OPT | LnFeatures.PAYMENT_SECRET_REQ
| LnFeatures.BASIC_MPP_OPT | LnFeatures.BASIC_MPP_REQ
| LnFeatures.OPTION_TRAMPOLINE_ROUTING_OPT | LnFeatures.OPTION_TRAMPOLINE_ROUTING_REQ
| LnFeatures.OPTION_SHUTDOWN_ANYSEGWIT_OPT | LnFeatures.OPTION_SHUTDOWN_ANYSEGWIT_REQ
)

3
electrum/lnworker.py
View File

@@ -175,7 +175,8 @@ LNWALLET_FEATURES = BASE_FEATURES\
| LnFeatures.OPTION_STATIC_REMOTEKEY_REQ\
| LnFeatures.GOSSIP_QUERIES_REQ\
| LnFeatures.BASIC_MPP_OPT\
| LnFeatures.OPTION_TRAMPOLINE_ROUTING_OPT
| LnFeatures.OPTION_TRAMPOLINE_ROUTING_OPT\
| LnFeatures.OPTION_SHUTDOWN_ANYSEGWIT_OPT\
LNGOSSIP_FEATURES = BASE_FEATURES\
| LnFeatures.GOSSIP_QUERIES_OPT\

12
electrum/tests/test_transaction.py
View File

@@ -3,7 +3,8 @@ from typing import NamedTuple, Union
from electrum import transaction, bitcoin
from electrum.transaction import (convert_raw_tx_to_hex, tx_from_any, Transaction,
PartialTransaction, TxOutpoint, PartialTxInput,
PartialTxOutput, Sighash)
PartialTxOutput, Sighash, match_script_against_template,
SCRIPTPUBKEY_TEMPLATE_ANYSEGWIT)
from electrum.util import bh2u, bfh
from electrum.bitcoin import (deserialize_privkey, opcodes,
construct_script, construct_witness)
@@ -78,6 +79,13 @@ class TestBCDataStream(ElectrumTestCase):
class TestTransaction(ElectrumTestCase):
def test_match_against_script_template(self):
script = bfh(construct_script([opcodes.OP_5, bytes(29)]))
self.assertTrue(match_script_against_template(script, SCRIPTPUBKEY_TEMPLATE_ANYSEGWIT))
script = bfh(construct_script([opcodes.OP_NOP, bytes(30)]))
self.assertFalse(match_script_against_template(script, SCRIPTPUBKEY_TEMPLATE_ANYSEGWIT))
script = bfh(construct_script([opcodes.OP_0, bytes(50)]))
self.assertFalse(match_script_against_template(script, SCRIPTPUBKEY_TEMPLATE_ANYSEGWIT))
def test_tx_update_signatures(self):
tx = tx_from_any("cHNidP8BAFUBAAAAASpcmpT83pj1WBzQAWLGChOTbOt1OJ6mW/OGM7Qk60AxAAAAAAD/////AUBCDwAAAAAAGXapFCMKw3g0BzpCFG8R74QUrpKf6q/DiKwAAAAAAAAA")
@@ -927,7 +935,7 @@ class TestSighashTypes(ElectrumTestCase):
txin = PartialTxInput(prevout=prevout)
txin.nsequence=0xffffffff
txin.script_type='p2sh-p2wsh'
txin.witness_script = bfh('56210307b8ae49ac90a048e9b53357a2354b3334e9c8bee813ecb98e99a7e07e8c3ba32103b28f0c28bfab54554ae8c658ac5c3e0ce6e79ad336331f78c428dd43eea8449b21034b8113d703413d57761b8b9781957b8c0ac1dfe69f492580ca4195f50376ba4a21033400f6afecb833092a9a21cfdf1ed1376e58c5d1f47de74683123987e967a8f42103a6d48b1131e94ba04d9737d61acdaa1322008af9602b3b14862c07a1789aac162102d8b661b0b3302ee2f162b09e07a55ad5dfbe673a9f01d9f0c19617681024306b56ae')
txin.witness_script = bfh('56210307b8ae49ac90a048e9b53357a2354b3334e9c8bee813ecb98e99a7e07e8c3ba32103b28f0c28bfab54554ae8c658ac5c3e0ce6e79ad336331f78c428dd43eea8449b21034b8113d703413d57761b8b9781957b8c0ac1dfe69f492580ca4195f50376ba4a21033400f6afecb833092a9a21cfdf1ed1376e58c5d1f47de74683123987e967a8f42103a6d48b1131e94ba04d9737d61acdaa1322008af9602b3b14862c07a1789aac162102d8b661b0b3302ee2f162b09e07a55ad5dfbe673a9f01d9f0c19617681024306b56ae')
txin.redeem_script = bfh('0020a16b5755f7f6f96dbd65f5f0d6ab9418b89af4b1f14a1bb8a09062c35f0dcb54')
txin._trusted_value_sats = 987654321
#Output of Transaction

19
electrum/transaction.py
View File

@@ -431,7 +431,23 @@ class OPPushDataGeneric:
or (isinstance(item, type) and issubclass(item, cls))
class OPGeneric:
def __init__(self, matcher: Callable=None):
if matcher is not None:
self.matcher = matcher
def match(self, op) -> bool:
return self.matcher(op)
@classmethod
def is_instance(cls, item):
# accept objects that are instances of this class
# or other classes that are subclasses
return isinstance(item, cls) \
or (isinstance(item, type) and issubclass(item, cls))
OPPushDataPubkey = OPPushDataGeneric(lambda x: x in (33, 65))
OP_ANYSEGWIT_VERSION = OPGeneric(lambda x: x in list(range(opcodes.OP_1, opcodes.OP_16 + 1)))
SCRIPTPUBKEY_TEMPLATE_P2PKH = [opcodes.OP_DUP, opcodes.OP_HASH160,
OPPushDataGeneric(lambda x: x == 20),
@@ -440,6 +456,7 @@ SCRIPTPUBKEY_TEMPLATE_P2SH = [opcodes.OP_HASH160, OPPushDataGeneric(lambda x: x
SCRIPTPUBKEY_TEMPLATE_WITNESS_V0 = [opcodes.OP_0, OPPushDataGeneric(lambda x: x in (20, 32))]
SCRIPTPUBKEY_TEMPLATE_P2WPKH = [opcodes.OP_0, OPPushDataGeneric(lambda x: x == 20)]
SCRIPTPUBKEY_TEMPLATE_P2WSH = [opcodes.OP_0, OPPushDataGeneric(lambda x: x == 32)]
SCRIPTPUBKEY_TEMPLATE_ANYSEGWIT = [OP_ANYSEGWIT_VERSION, OPPushDataGeneric(lambda x: x in list(range(2, 40 + 1)))]
def match_script_against_template(script, template) -> bool:
@@ -459,6 +476,8 @@ def match_script_against_template(script, template) -> bool:
script_item = script[i]
if OPPushDataGeneric.is_instance(template_item) and template_item.check_data_len(script_item[0]):
continue
if OPGeneric.is_instance(template_item) and template_item.match(script_item[0]):
continue
if template_item != script_item[0]:
return False
return True