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lnpeer: better error handling when processing onion packets

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SomberNight 2020-03-24 17:48:06 +01:00
parent 30bf32b34b
commit d424487814
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GPG key ID: B33B5F232C6271E9
2 changed files with 26 additions and 5 deletions
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1
electrum/lnonion.py
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@ -484,6 +484,7 @@ class OnionFailureCode(IntEnum):
FINAL_INCORRECT_HTLC_AMOUNT = 19
CHANNEL_DISABLED = UPDATE | 20
EXPIRY_TOO_FAR = 21
INVALID_ONION_PAYLOAD = PERM | 22
# don't use these elsewhere, the names are ambiguous without context

30
electrum/lnpeer.py
View file

@ -1149,7 +1149,10 @@ class Peer(Logger):
if not forwarding_enabled:
self.logger.info(f"forwarding is disabled. failing htlc.")
return OnionRoutingFailureMessage(code=OnionFailureCode.PERMANENT_CHANNEL_FAILURE, data=b'')
next_chan_scid = processed_onion.hop_data.payload["short_channel_id"]["short_channel_id"]
try:
next_chan_scid = processed_onion.hop_data.payload["short_channel_id"]["short_channel_id"]
except:
return OnionRoutingFailureMessage(code=OnionFailureCode.INVALID_ONION_PAYLOAD, data=b'\x00\x00\x00')
next_chan = self.lnworker.get_channel_by_short_id(next_chan_scid)
local_height = self.network.get_local_height()
if next_chan is None:
@ -1162,7 +1165,10 @@ class Peer(Logger):
f"chan state {next_chan.get_state()}, peer state: {next_chan.peer_state}")
data = outgoing_chan_upd_len + outgoing_chan_upd
return OnionRoutingFailureMessage(code=OnionFailureCode.TEMPORARY_CHANNEL_FAILURE, data=data)
next_cltv_expiry = processed_onion.hop_data.payload["outgoing_cltv_value"]["outgoing_cltv_value"]
try:
next_cltv_expiry = processed_onion.hop_data.payload["outgoing_cltv_value"]["outgoing_cltv_value"]
except:
return OnionRoutingFailureMessage(code=OnionFailureCode.INVALID_ONION_PAYLOAD, data=b'\x00\x00\x00')
if htlc.cltv_expiry - next_cltv_expiry < NBLOCK_OUR_CLTV_EXPIRY_DELTA:
data = htlc.cltv_expiry.to_bytes(4, byteorder="big") + outgoing_chan_upd_len + outgoing_chan_upd
return OnionRoutingFailureMessage(code=OnionFailureCode.INCORRECT_CLTV_EXPIRY, data=data)
@ -1172,7 +1178,10 @@ class Peer(Logger):
return OnionRoutingFailureMessage(code=OnionFailureCode.EXPIRY_TOO_SOON, data=data)
if max(htlc.cltv_expiry, next_cltv_expiry) > local_height + lnutil.NBLOCK_CLTV_EXPIRY_TOO_FAR_INTO_FUTURE:
return OnionRoutingFailureMessage(code=OnionFailureCode.EXPIRY_TOO_FAR, data=b'')
next_amount_msat_htlc = processed_onion.hop_data.payload["amt_to_forward"]["amt_to_forward"]
try:
next_amount_msat_htlc = processed_onion.hop_data.payload["amt_to_forward"]["amt_to_forward"]
except:
return OnionRoutingFailureMessage(code=OnionFailureCode.INVALID_ONION_PAYLOAD, data=b'\x00\x00\x00')
forwarding_fees = fee_for_edge_msat(
forwarded_amount_msat=next_amount_msat_htlc,
fee_base_msat=lnutil.OUR_FEE_BASE_MSAT,
@ -1221,12 +1230,20 @@ class Peer(Logger):
if local_height + MIN_FINAL_CLTV_EXPIRY_ACCEPTED > htlc.cltv_expiry:
reason = OnionRoutingFailureMessage(code=OnionFailureCode.FINAL_EXPIRY_TOO_SOON, data=b'')
return False, reason
cltv_from_onion = processed_onion.hop_data.payload["outgoing_cltv_value"]["outgoing_cltv_value"]
try:
cltv_from_onion = processed_onion.hop_data.payload["outgoing_cltv_value"]["outgoing_cltv_value"]
except:
reason = OnionRoutingFailureMessage(code=OnionFailureCode.INVALID_ONION_PAYLOAD, data=b'\x00\x00\x00')
return False, reason
if cltv_from_onion != htlc.cltv_expiry:
reason = OnionRoutingFailureMessage(code=OnionFailureCode.FINAL_INCORRECT_CLTV_EXPIRY,
data=htlc.cltv_expiry.to_bytes(4, byteorder="big"))
return False, reason
amount_from_onion = processed_onion.hop_data.payload["amt_to_forward"]["amt_to_forward"]
try:
amount_from_onion = processed_onion.hop_data.payload["amt_to_forward"]["amt_to_forward"]
except:
reason = OnionRoutingFailureMessage(code=OnionFailureCode.INVALID_ONION_PAYLOAD, data=b'\x00\x00\x00')
return False, reason
if amount_from_onion > htlc.amount_msat:
reason = OnionRoutingFailureMessage(code=OnionFailureCode.FINAL_INCORRECT_HTLC_AMOUNT,
data=htlc.amount_msat.to_bytes(8, byteorder="big"))
@ -1463,6 +1480,9 @@ class Peer(Logger):
error_reason = OnionRoutingFailureMessage(code=OnionFailureCode.INVALID_ONION_KEY, data=sha256(onion_packet_bytes))
except InvalidOnionMac:
error_reason = OnionRoutingFailureMessage(code=OnionFailureCode.INVALID_ONION_HMAC, data=sha256(onion_packet_bytes))
except Exception as e:
self.logger.info(f"error processing onion packet: {e!r}")
error_reason = OnionRoutingFailureMessage(code=OnionFailureCode.TEMPORARY_NODE_FAILURE, data=b'')
else:
if processed_onion.are_we_final:
preimage, error_reason = self.maybe_fulfill_htlc(