mirror of
https://github.com/LBRYFoundation/LBRY-Vault.git
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622 lines
26 KiB
Python
622 lines
26 KiB
Python
#!/usr/bin/env python
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#
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# Electrum - lightweight Bitcoin client
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# Copyright (C) 2011 thomasv@gitorious
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#
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# Permission is hereby granted, free of charge, to any person
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# obtaining a copy of this software and associated documentation files
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# (the "Software"), to deal in the Software without restriction,
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# including without limitation the rights to use, copy, modify, merge,
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# publish, distribute, sublicense, and/or sell copies of the Software,
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# and to permit persons to whom the Software is furnished to do so,
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# subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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import os
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import re
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import ssl
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import sys
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import traceback
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import asyncio
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from typing import Tuple, Union, List
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from collections import defaultdict
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import aiorpcx
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from aiorpcx import ClientSession, Notification
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from .util import PrintError, ignore_exceptions, log_exceptions, bfh, SilentTaskGroup
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from . import util
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from . import x509
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from . import pem
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from .version import ELECTRUM_VERSION, PROTOCOL_VERSION
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from . import blockchain
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from .blockchain import Blockchain
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from . import constants
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class NotificationSession(ClientSession):
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def __init__(self, *args, **kwargs):
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super(NotificationSession, self).__init__(*args, **kwargs)
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self.subscriptions = defaultdict(list)
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self.cache = {}
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self.in_flight_requests_semaphore = asyncio.Semaphore(100)
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async def handle_request(self, request):
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# note: if server sends malformed request and we raise, the superclass
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# will catch the exception, count errors, and at some point disconnect
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if isinstance(request, Notification):
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params, result = request.args[:-1], request.args[-1]
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key = self.get_hashable_key_for_rpc_call(request.method, params)
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if key in self.subscriptions:
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self.cache[key] = result
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for queue in self.subscriptions[key]:
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await queue.put(request.args)
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else:
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raise Exception('unexpected request: {}'.format(repr(request)))
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async def send_request(self, *args, timeout=-1, **kwargs):
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# note: the timeout starts after the request touches the wire!
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if timeout == -1:
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timeout = 20 if not self.proxy else 30
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# note: the semaphore implementation guarantees no starvation
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async with self.in_flight_requests_semaphore:
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try:
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return await asyncio.wait_for(
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super().send_request(*args, **kwargs),
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timeout)
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except asyncio.TimeoutError as e:
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raise RequestTimedOut('request timed out: {}'.format(args)) from e
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async def subscribe(self, method: str, params: List, queue: asyncio.Queue):
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# note: until the cache is written for the first time,
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# each 'subscribe' call might make a request on the network.
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key = self.get_hashable_key_for_rpc_call(method, params)
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self.subscriptions[key].append(queue)
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if key in self.cache:
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result = self.cache[key]
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else:
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result = await self.send_request(method, params)
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self.cache[key] = result
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await queue.put(params + [result])
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def unsubscribe(self, queue):
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"""Unsubscribe a callback to free object references to enable GC."""
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# note: we can't unsubscribe from the server, so we keep receiving
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# subsequent notifications
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for v in self.subscriptions.values():
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if queue in v:
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v.remove(queue)
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@classmethod
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def get_hashable_key_for_rpc_call(cls, method, params):
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"""Hashable index for subscriptions and cache"""
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return str(method) + repr(params)
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class GracefulDisconnect(Exception): pass
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class RequestTimedOut(GracefulDisconnect): pass
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class ErrorParsingSSLCert(Exception): pass
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class ErrorGettingSSLCertFromServer(Exception): pass
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def deserialize_server(server_str: str) -> Tuple[str, str, str]:
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# host might be IPv6 address, hence do rsplit:
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host, port, protocol = str(server_str).rsplit(':', 2)
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if not host:
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raise ValueError('host must not be empty')
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if protocol not in ('s', 't'):
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raise ValueError('invalid network protocol: {}'.format(protocol))
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int(port) # Throw if cannot be converted to int
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if not (0 < int(port) < 2**16):
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raise ValueError('port {} is out of valid range'.format(port))
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return host, port, protocol
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def serialize_server(host: str, port: Union[str, int], protocol: str) -> str:
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return str(':'.join([host, str(port), protocol]))
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class Interface(PrintError):
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def __init__(self, network, server, config_path, proxy):
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self.ready = asyncio.Future()
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self.got_disconnected = asyncio.Future()
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self.server = server
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self.host, self.port, self.protocol = deserialize_server(self.server)
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self.port = int(self.port)
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self.config_path = config_path
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self.cert_path = os.path.join(self.config_path, 'certs', self.host)
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self.blockchain = None
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self._requested_chunks = set()
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self.network = network
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self._set_proxy(proxy)
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self.session = None # type: NotificationSession
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self.tip_header = None
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self.tip = 0
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asyncio.run_coroutine_threadsafe(
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self.network.main_taskgroup.spawn(self.run()), self.network.asyncio_loop)
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self.group = SilentTaskGroup()
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def diagnostic_name(self):
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return self.host
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def _set_proxy(self, proxy: dict):
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if proxy:
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username, pw = proxy.get('user'), proxy.get('password')
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if not username or not pw:
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auth = None
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else:
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auth = aiorpcx.socks.SOCKSUserAuth(username, pw)
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if proxy['mode'] == "socks4":
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self.proxy = aiorpcx.socks.SOCKSProxy((proxy['host'], int(proxy['port'])), aiorpcx.socks.SOCKS4a, auth)
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elif proxy['mode'] == "socks5":
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self.proxy = aiorpcx.socks.SOCKSProxy((proxy['host'], int(proxy['port'])), aiorpcx.socks.SOCKS5, auth)
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else:
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raise NotImplementedError # http proxy not available with aiorpcx
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else:
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self.proxy = None
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async def is_server_ca_signed(self, sslc):
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try:
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await self.open_session(sslc, exit_early=True)
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except ssl.SSLError as e:
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assert e.reason == 'CERTIFICATE_VERIFY_FAILED'
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return False
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return True
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async def _try_saving_ssl_cert_for_first_time(self, ca_ssl_context):
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try:
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ca_signed = await self.is_server_ca_signed(ca_ssl_context)
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except (OSError, aiorpcx.socks.SOCKSFailure) as e:
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raise ErrorGettingSSLCertFromServer(e) from e
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if ca_signed:
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with open(self.cert_path, 'w') as f:
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# empty file means this is CA signed, not self-signed
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f.write('')
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else:
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await self.save_certificate()
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def _is_saved_ssl_cert_available(self):
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if not os.path.exists(self.cert_path):
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return False
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with open(self.cert_path, 'r') as f:
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contents = f.read()
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if contents == '': # CA signed
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return True
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# pinned self-signed cert
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try:
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b = pem.dePem(contents, 'CERTIFICATE')
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except SyntaxError as e:
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self.print_error("error parsing already saved cert:", e)
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raise ErrorParsingSSLCert(e) from e
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try:
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x = x509.X509(b)
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except Exception as e:
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self.print_error("error parsing already saved cert:", e)
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raise ErrorParsingSSLCert(e) from e
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try:
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x.check_date()
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return True
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except x509.CertificateError as e:
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self.print_error("certificate has expired:", e)
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os.unlink(self.cert_path) # delete pinned cert only in this case
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return False
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async def _get_ssl_context(self):
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if self.protocol != 's':
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# using plaintext TCP
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return None
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# see if we already have cert for this server; or get it for the first time
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ca_sslc = ssl.create_default_context(ssl.Purpose.SERVER_AUTH)
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if not self._is_saved_ssl_cert_available():
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await self._try_saving_ssl_cert_for_first_time(ca_sslc)
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# now we have a file saved in our certificate store
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siz = os.stat(self.cert_path).st_size
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if siz == 0:
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# CA signed cert
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sslc = ca_sslc
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else:
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# pinned self-signed cert
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sslc = ssl.create_default_context(ssl.Purpose.SERVER_AUTH, cafile=self.cert_path)
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sslc.check_hostname = 0
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return sslc
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def handle_disconnect(func):
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async def wrapper_func(self, *args, **kwargs):
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try:
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return await func(self, *args, **kwargs)
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except GracefulDisconnect as e:
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self.print_error("disconnecting gracefully. {}".format(e))
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finally:
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await self.network.connection_down(self.server)
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self.got_disconnected.set_result(1)
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return wrapper_func
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@ignore_exceptions # do not kill main_taskgroup
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@log_exceptions
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@handle_disconnect
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async def run(self):
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try:
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ssl_context = await self._get_ssl_context()
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except (ErrorParsingSSLCert, ErrorGettingSSLCertFromServer) as e:
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self.print_error('disconnecting due to: {}'.format(repr(e)))
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return
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try:
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await self.open_session(ssl_context)
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except (asyncio.CancelledError, OSError, aiorpcx.socks.SOCKSFailure) as e:
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self.print_error('disconnecting due to: {}'.format(repr(e)))
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return
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def mark_ready(self):
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if self.ready.cancelled():
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raise GracefulDisconnect('conn establishment was too slow; *ready* future was cancelled')
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if self.ready.done():
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return
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assert self.tip_header
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chain = blockchain.check_header(self.tip_header)
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if not chain:
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self.blockchain = blockchain.blockchains[0]
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else:
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self.blockchain = chain
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assert self.blockchain is not None
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self.print_error("set blockchain with height", self.blockchain.height())
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self.ready.set_result(1)
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async def save_certificate(self):
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if not os.path.exists(self.cert_path):
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# we may need to retry this a few times, in case the handshake hasn't completed
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for _ in range(10):
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dercert = await self.get_certificate()
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if dercert:
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self.print_error("succeeded in getting cert")
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with open(self.cert_path, 'w') as f:
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cert = ssl.DER_cert_to_PEM_cert(dercert)
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# workaround android bug
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cert = re.sub("([^\n])-----END CERTIFICATE-----","\\1\n-----END CERTIFICATE-----",cert)
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f.write(cert)
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# even though close flushes we can't fsync when closed.
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# and we must flush before fsyncing, cause flush flushes to OS buffer
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# fsync writes to OS buffer to disk
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f.flush()
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os.fsync(f.fileno())
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break
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await asyncio.sleep(1)
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else:
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raise Exception("could not get certificate")
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async def get_certificate(self):
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sslc = ssl.SSLContext()
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try:
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async with aiorpcx.ClientSession(self.host, self.port, ssl=sslc, proxy=self.proxy) as session:
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return session.transport._ssl_protocol._sslpipe._sslobj.getpeercert(True)
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except ValueError:
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return None
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async def get_block_header(self, height, assert_mode):
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# use lower timeout as we usually have network.bhi_lock here
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self.print_error('requesting block header {} in mode {}'.format(height, assert_mode))
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timeout = 5 if not self.proxy else 10
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res = await self.session.send_request('blockchain.block.header', [height], timeout=timeout)
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return blockchain.deserialize_header(bytes.fromhex(res), height)
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async def request_chunk(self, height, tip=None, *, can_return_early=False):
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index = height // 2016
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if can_return_early and index in self._requested_chunks:
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return
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self.print_error("requesting chunk from height {}".format(height))
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size = 2016
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if tip is not None:
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size = min(size, tip - index * 2016 + 1)
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size = max(size, 0)
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try:
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self._requested_chunks.add(index)
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res = await self.session.send_request('blockchain.block.headers', [index * 2016, size])
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finally:
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try: self._requested_chunks.remove(index)
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except KeyError: pass
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conn = self.blockchain.connect_chunk(index, res['hex'])
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if not conn:
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return conn, 0
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return conn, res['count']
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async def open_session(self, sslc, exit_early=False):
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self.session = NotificationSession(self.host, self.port, ssl=sslc, proxy=self.proxy)
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async with self.session as session:
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try:
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ver = await session.send_request('server.version', [ELECTRUM_VERSION, PROTOCOL_VERSION])
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except aiorpcx.jsonrpc.RPCError as e:
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raise GracefulDisconnect(e) # probably 'unsupported protocol version'
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if exit_early:
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return
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self.print_error("connection established. version: {}".format(ver))
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async with self.group as group:
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await group.spawn(self.ping)
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await group.spawn(self.run_fetch_blocks)
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await group.spawn(self.monitor_connection)
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# NOTE: group.__aexit__ will be called here; this is needed to notice exceptions in the group!
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async def monitor_connection(self):
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while True:
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await asyncio.sleep(1)
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if not self.session or self.session.is_closing():
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raise GracefulDisconnect('server closed session')
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async def ping(self):
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while True:
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await asyncio.sleep(300)
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await self.session.send_request('server.ping')
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async def close(self):
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await self.group.cancel_remaining()
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async def run_fetch_blocks(self):
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header_queue = asyncio.Queue()
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await self.session.subscribe('blockchain.headers.subscribe', [], header_queue)
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while True:
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item = await header_queue.get()
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raw_header = item[0]
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height = raw_header['height']
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header = blockchain.deserialize_header(bfh(raw_header['hex']), height)
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self.tip_header = header
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self.tip = height
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if self.tip < constants.net.max_checkpoint():
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raise GracefulDisconnect('server tip below max checkpoint')
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self.mark_ready()
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await self._process_header_at_tip()
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self.network.trigger_callback('network_updated')
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await self.network.switch_unwanted_fork_interface()
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await self.network.switch_lagging_interface()
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async def _process_header_at_tip(self):
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height, header = self.tip, self.tip_header
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async with self.network.bhi_lock:
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if self.blockchain.height() >= height and self.blockchain.check_header(header):
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# another interface amended the blockchain
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self.print_error("skipping header", height)
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return
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_, height = await self.step(height, header)
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# in the simple case, height == self.tip+1
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if height <= self.tip:
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await self.sync_until(height)
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self.network.trigger_callback('blockchain_updated')
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async def sync_until(self, height, next_height=None):
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if next_height is None:
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next_height = self.tip
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last = None
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while last is None or height <= next_height:
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prev_last, prev_height = last, height
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if next_height > height + 10:
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could_connect, num_headers = await self.request_chunk(height, next_height)
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if not could_connect:
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if height <= constants.net.max_checkpoint():
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raise GracefulDisconnect('server chain conflicts with checkpoints or genesis')
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last, height = await self.step(height)
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continue
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self.network.trigger_callback('network_updated')
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height = (height // 2016 * 2016) + num_headers
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assert height <= next_height+1, (height, self.tip)
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last = 'catchup'
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else:
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last, height = await self.step(height)
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assert (prev_last, prev_height) != (last, height), 'had to prevent infinite loop in interface.sync_until'
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return last, height
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async def step(self, height, header=None):
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assert height != 0
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assert height <= self.tip, (height, self.tip)
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if header is None:
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header = await self.get_block_header(height, 'catchup')
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chain = blockchain.check_header(header) if 'mock' not in header else header['mock']['check'](header)
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if chain:
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self.blockchain = chain if isinstance(chain, Blockchain) else self.blockchain
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return 'catchup', height+1
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can_connect = blockchain.can_connect(header) if 'mock' not in header else header['mock']['connect'](height)
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if not can_connect:
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self.print_error("can't connect", height)
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height, header, bad, bad_header = await self._search_headers_backwards(height, header)
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chain = blockchain.check_header(header) if 'mock' not in header else header['mock']['check'](header)
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can_connect = blockchain.can_connect(header) if 'mock' not in header else header['mock']['connect'](height)
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assert chain or can_connect
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if can_connect:
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self.print_error("could connect", height)
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height += 1
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if isinstance(can_connect, Blockchain): # not when mocking
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self.blockchain = can_connect
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self.blockchain.save_header(header)
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return 'catchup', height
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good, bad, bad_header = await self._search_headers_binary(height, bad, bad_header, chain)
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return await self._resolve_potential_chain_fork_given_forkpoint(good, bad, bad_header)
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async def _search_headers_binary(self, height, bad, bad_header, chain):
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assert bad == bad_header['block_height']
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_assert_header_does_not_check_against_any_chain(bad_header)
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self.blockchain = chain if isinstance(chain, Blockchain) else self.blockchain
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good = height
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while True:
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assert good < bad, (good, bad)
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height = (good + bad) // 2
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self.print_error("binary step. good {}, bad {}, height {}".format(good, bad, height))
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header = await self.get_block_header(height, 'binary')
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chain = blockchain.check_header(header) if 'mock' not in header else header['mock']['check'](header)
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if chain:
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self.blockchain = chain if isinstance(chain, Blockchain) else self.blockchain
|
|
good = height
|
|
else:
|
|
bad = height
|
|
bad_header = header
|
|
if good + 1 == bad:
|
|
break
|
|
|
|
mock = 'mock' in bad_header and bad_header['mock']['connect'](height)
|
|
real = not mock and self.blockchain.can_connect(bad_header, check_height=False)
|
|
if not real and not mock:
|
|
raise Exception('unexpected bad header during binary: {}'.format(bad_header))
|
|
_assert_header_does_not_check_against_any_chain(bad_header)
|
|
|
|
self.print_error("binary search exited. good {}, bad {}".format(good, bad))
|
|
return good, bad, bad_header
|
|
|
|
async def _resolve_potential_chain_fork_given_forkpoint(self, good, bad, bad_header):
|
|
assert good + 1 == bad
|
|
assert bad == bad_header['block_height']
|
|
_assert_header_does_not_check_against_any_chain(bad_header)
|
|
# 'good' is the height of a block 'good_header', somewhere in self.blockchain.
|
|
# bad_header connects to good_header; bad_header itself is NOT in self.blockchain.
|
|
|
|
bh = self.blockchain.height()
|
|
assert bh >= good
|
|
if bh == good:
|
|
height = good + 1
|
|
self.print_error("catching up from {}".format(height))
|
|
return 'no_fork', height
|
|
|
|
# this is a new fork we don't yet have
|
|
height = bad + 1
|
|
branch = blockchain.blockchains.get(bad)
|
|
if branch is not None:
|
|
# Conflict!! As our fork handling is not completely general,
|
|
# we need to delete another fork to save this one.
|
|
# Note: This could be a potential DOS vector against Electrum.
|
|
# However, mining blocks that satisfy the difficulty requirements
|
|
# is assumed to be expensive; especially as forks below the max
|
|
# checkpoint are ignored.
|
|
self.print_error("new fork at bad height {}. conflict!!".format(bad))
|
|
assert self.blockchain != branch
|
|
ismocking = type(branch) is dict
|
|
if ismocking:
|
|
self.print_error("TODO replace blockchain")
|
|
return 'fork_conflict', height
|
|
self.print_error('forkpoint conflicts with existing fork', branch.path())
|
|
self._raise_if_fork_conflicts_with_default_server(branch)
|
|
await self._disconnect_from_interfaces_on_conflicting_blockchain(branch)
|
|
branch.write(b'', 0)
|
|
branch.save_header(bad_header)
|
|
self.blockchain = branch
|
|
return 'fork_conflict', height
|
|
else:
|
|
# No conflict. Just save the new fork.
|
|
self.print_error("new fork at bad height {}. NO conflict.".format(bad))
|
|
forkfun = self.blockchain.fork if 'mock' not in bad_header else bad_header['mock']['fork']
|
|
b = forkfun(bad_header)
|
|
with blockchain.blockchains_lock:
|
|
assert bad not in blockchain.blockchains, (bad, list(blockchain.blockchains))
|
|
blockchain.blockchains[bad] = b
|
|
self.blockchain = b
|
|
assert b.forkpoint == bad
|
|
return 'fork_noconflict', height
|
|
|
|
def _raise_if_fork_conflicts_with_default_server(self, chain_to_delete: Blockchain) -> None:
|
|
main_interface = self.network.interface
|
|
if not main_interface: return
|
|
if main_interface == self: return
|
|
chain_of_default_server = main_interface.blockchain
|
|
if not chain_of_default_server: return
|
|
if chain_to_delete == chain_of_default_server:
|
|
raise GracefulDisconnect('refusing to overwrite blockchain of default server')
|
|
|
|
async def _disconnect_from_interfaces_on_conflicting_blockchain(self, chain: Blockchain) -> None:
|
|
ifaces = await self.network.disconnect_from_interfaces_on_given_blockchain(chain)
|
|
if not ifaces: return
|
|
servers = [interface.server for interface in ifaces]
|
|
self.print_error("forcing disconnect of other interfaces: {}".format(servers))
|
|
|
|
async def _search_headers_backwards(self, height, header):
|
|
async def iterate():
|
|
nonlocal height, header
|
|
checkp = False
|
|
if height <= constants.net.max_checkpoint():
|
|
height = constants.net.max_checkpoint()
|
|
checkp = True
|
|
header = await self.get_block_header(height, 'backward')
|
|
chain = blockchain.check_header(header) if 'mock' not in header else header['mock']['check'](header)
|
|
can_connect = blockchain.can_connect(header) if 'mock' not in header else header['mock']['connect'](height)
|
|
if chain or can_connect:
|
|
return False
|
|
if checkp:
|
|
raise GracefulDisconnect("server chain conflicts with checkpoints")
|
|
return True
|
|
|
|
bad, bad_header = height, header
|
|
_assert_header_does_not_check_against_any_chain(bad_header)
|
|
with blockchain.blockchains_lock: chains = list(blockchain.blockchains.values())
|
|
local_max = max([0] + [x.height() for x in chains]) if 'mock' not in header else float('inf')
|
|
height = min(local_max + 1, height - 1)
|
|
while await iterate():
|
|
bad, bad_header = height, header
|
|
delta = self.tip - height
|
|
height = self.tip - 2 * delta
|
|
|
|
_assert_header_does_not_check_against_any_chain(bad_header)
|
|
self.print_error("exiting backward mode at", height)
|
|
return height, header, bad, bad_header
|
|
|
|
|
|
def _assert_header_does_not_check_against_any_chain(header: dict) -> None:
|
|
chain_bad = blockchain.check_header(header) if 'mock' not in header else header['mock']['check'](header)
|
|
if chain_bad:
|
|
raise Exception('bad_header must not check!')
|
|
|
|
|
|
def check_cert(host, cert):
|
|
try:
|
|
b = pem.dePem(cert, 'CERTIFICATE')
|
|
x = x509.X509(b)
|
|
except:
|
|
traceback.print_exc(file=sys.stdout)
|
|
return
|
|
|
|
try:
|
|
x.check_date()
|
|
expired = False
|
|
except:
|
|
expired = True
|
|
|
|
m = "host: %s\n"%host
|
|
m += "has_expired: %s\n"% expired
|
|
util.print_msg(m)
|
|
|
|
|
|
# Used by tests
|
|
def _match_hostname(name, val):
|
|
if val == name:
|
|
return True
|
|
|
|
return val.startswith('*.') and name.endswith(val[1:])
|
|
|
|
|
|
def test_certificates():
|
|
from .simple_config import SimpleConfig
|
|
config = SimpleConfig()
|
|
mydir = os.path.join(config.path, "certs")
|
|
certs = os.listdir(mydir)
|
|
for c in certs:
|
|
p = os.path.join(mydir,c)
|
|
with open(p, encoding='utf-8') as f:
|
|
cert = f.read()
|
|
check_cert(c, cert)
|
|
|
|
if __name__ == "__main__":
|
|
test_certificates()
|