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network: disconnect from server on incorrect header length

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fix #4522
This commit is contained in:
SomberNight 2018-07-13 18:11:48 +02:00
parent 87f6aa09df
commit b44aca1654
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GPG key ID: B33B5F232C6271E9
2 changed files with 10 additions and 3 deletions
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6
electrum/blockchain.py
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@ -34,6 +34,8 @@ MAX_TARGET = 0x00000000FFFF0000000000000000000000000000000000000000000000000000
class MissingHeader(Exception):
pass
class InvalidHeader(Exception):
pass
def serialize_header(res):
s = int_to_hex(res.get('version'), 4) \
@ -46,9 +48,9 @@ def serialize_header(res):
def deserialize_header(s, height):
if not s:
raise Exception('Invalid header: {}'.format(s))
raise InvalidHeader('Invalid header: {}'.format(s))
if len(s) != 80:
raise Exception('Invalid header length: {}'.format(len(s)))
raise InvalidHeader('Invalid header length: {}'.format(len(s)))
hex_to_int = lambda s: int('0x' + bh2u(s[::-1]), 16)
h = {}
h['version'] = hex_to_int(s[0:4])

7
electrum/network.py
View file

@ -47,6 +47,7 @@ from .interface import Connection, Interface
from . import blockchain
from .version import ELECTRUM_VERSION, PROTOCOL_VERSION
from .i18n import _
from .blockchain import InvalidHeader
NODES_RETRY_INTERVAL = 60
@ -1075,7 +1076,11 @@ class Network(util.DaemonThread):
# no point in keeping this connection without headers sub
self.connection_down(interface.server)
return
header = blockchain.deserialize_header(util.bfh(header_hex), height)
try:
header = blockchain.deserialize_header(util.bfh(header_hex), height)
except InvalidHeader:
self.connection_down(interface.server)
return
if height < self.max_checkpoint():
self.connection_down(interface.server)
return