573 lines
20 KiB
Python
573 lines
20 KiB
Python
#!/usr/bin/env python
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#
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# Electrum - lightweight bitcoinprivate client
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# Copyright (C) 2015 Thomas Voegtlin
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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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from collections import namedtuple
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import traceback
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import sys
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import os
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import imp
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import pkgutil
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import time
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import threading
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from .util import print_error
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from .i18n import _
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from .util import profiler, PrintError, DaemonThread, UserCancelled, ThreadJob
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from . import bitcoin
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plugin_loaders = {}
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hook_names = set()
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hooks = {}
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class Plugins(DaemonThread):
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@profiler
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def __init__(self, config, is_local, gui_name):
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DaemonThread.__init__(self)
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if is_local:
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find = imp.find_module('plugins')
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plugins = imp.load_module('electrum_bitcoinprivate_plugins', *find)
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else:
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plugins = __import__('electrum_bitcoinprivate_plugins')
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self.pkgpath = os.path.dirname(plugins.__file__)
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self.config = config
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self.hw_wallets = {}
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self.plugins = {}
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self.gui_name = gui_name
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self.descriptions = {}
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self.device_manager = DeviceMgr(config)
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self.load_plugins()
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self.add_jobs(self.device_manager.thread_jobs())
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self.start()
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def load_plugins(self):
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for loader, name, ispkg in pkgutil.iter_modules([self.pkgpath]):
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# do not load deprecated plugins
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if name in ['plot', 'exchange_rate']:
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continue
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m = loader.find_module(name).load_module(name)
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d = m.__dict__
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gui_good = self.gui_name in d.get('available_for', [])
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if not gui_good:
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continue
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details = d.get('registers_wallet_type')
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if details:
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self.register_wallet_type(name, gui_good, details)
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details = d.get('registers_keystore')
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if details:
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self.register_keystore(name, gui_good, details)
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self.descriptions[name] = d
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if not d.get('requires_wallet_type') and self.config.get('use_' + name):
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try:
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self.load_plugin(name)
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except BaseException as e:
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traceback.print_exc(file=sys.stdout)
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self.print_error("cannot initialize plugin %s:" % name, str(e))
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def get(self, name):
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return self.plugins.get(name)
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def count(self):
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return len(self.plugins)
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def load_plugin(self, name):
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if name in self.plugins:
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return self.plugins[name]
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full_name = 'electrum_bitcoinprivate_plugins.' + name + '.' + self.gui_name
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loader = pkgutil.find_loader(full_name)
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if not loader:
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raise RuntimeError("%s implementation for %s plugin not found"
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% (self.gui_name, name))
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p = loader.load_module(full_name)
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plugin = p.Plugin(self, self.config, name)
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self.add_jobs(plugin.thread_jobs())
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self.plugins[name] = plugin
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self.print_error("loaded", name)
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return plugin
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def close_plugin(self, plugin):
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self.remove_jobs(plugin.thread_jobs())
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def enable(self, name):
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self.config.set_key('use_' + name, True, True)
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p = self.get(name)
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if p:
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return p
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return self.load_plugin(name)
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def disable(self, name):
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self.config.set_key('use_' + name, False, True)
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p = self.get(name)
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if not p:
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return
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self.plugins.pop(name)
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p.close()
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self.print_error("closed", name)
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def toggle(self, name):
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p = self.get(name)
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return self.disable(name) if p else self.enable(name)
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def is_available(self, name, w):
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d = self.descriptions.get(name)
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if not d:
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return False
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deps = d.get('requires', [])
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for dep, s in deps:
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try:
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__import__(dep)
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except ImportError:
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return False
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requires = d.get('requires_wallet_type', [])
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return not requires or w.wallet_type in requires
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def get_hardware_support(self):
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out = []
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for name, (gui_good, details) in self.hw_wallets.items():
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if gui_good:
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try:
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p = self.get_plugin(name)
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if p.is_enabled():
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out.append([name, details[2], p])
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except:
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traceback.print_exc()
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self.print_error("cannot load plugin for:", name)
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return out
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def register_wallet_type(self, name, gui_good, wallet_type):
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from .wallet import register_wallet_type, register_constructor
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self.print_error("registering wallet type", (wallet_type, name))
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def loader():
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plugin = self.get_plugin(name)
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register_constructor(wallet_type, plugin.wallet_class)
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register_wallet_type(wallet_type)
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plugin_loaders[wallet_type] = loader
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def register_keystore(self, name, gui_good, details):
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from .keystore import register_keystore
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def dynamic_constructor(d):
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return self.get_plugin(name).keystore_class(d)
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if details[0] == 'hardware':
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self.hw_wallets[name] = (gui_good, details)
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self.print_error("registering hardware %s: %s" %(name, details))
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register_keystore(details[1], dynamic_constructor)
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def get_plugin(self, name):
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if not name in self.plugins:
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self.load_plugin(name)
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return self.plugins[name]
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def run(self):
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while self.is_running():
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time.sleep(0.1)
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self.run_jobs()
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self.on_stop()
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def hook(func):
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hook_names.add(func.__name__)
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return func
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def run_hook(name, *args):
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results = []
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f_list = hooks.get(name, [])
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for p, f in f_list:
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if p.is_enabled():
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try:
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r = f(*args)
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except Exception:
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print_error("Plugin error")
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traceback.print_exc(file=sys.stdout)
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r = False
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if r:
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results.append(r)
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if results:
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assert len(results) == 1, results
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return results[0]
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class BasePlugin(PrintError):
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def __init__(self, parent, config, name):
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self.parent = parent # The plugins object
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self.name = name
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self.config = config
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self.wallet = None
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# add self to hooks
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for k in dir(self):
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if k in hook_names:
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l = hooks.get(k, [])
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l.append((self, getattr(self, k)))
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hooks[k] = l
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def diagnostic_name(self):
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return self.name
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def __str__(self):
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return self.name
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def close(self):
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# remove self from hooks
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for k in dir(self):
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if k in hook_names:
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l = hooks.get(k, [])
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l.remove((self, getattr(self, k)))
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hooks[k] = l
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self.parent.close_plugin(self)
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self.on_close()
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def on_close(self):
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pass
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def requires_settings(self):
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return False
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def thread_jobs(self):
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return []
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def is_enabled(self):
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return self.is_available() and self.config.get('use_'+self.name) is True
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def is_available(self):
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return True
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def can_user_disable(self):
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return True
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def settings_dialog(self):
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pass
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class DeviceNotFoundError(Exception):
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pass
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class DeviceUnpairableError(Exception):
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pass
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Device = namedtuple("Device", "path interface_number id_ product_key usage_page")
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DeviceInfo = namedtuple("DeviceInfo", "device label initialized")
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class DeviceMgr(ThreadJob, PrintError):
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'''Manages hardware clients. A client communicates over a hardware
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channel with the device.
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In addition to tracking device HID IDs, the device manager tracks
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hardware wallets and manages wallet pairing. A HID ID may be
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paired with a wallet when it is confirmed that the hardware device
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matches the wallet, i.e. they have the same master public key. A
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HID ID can be unpaired if e.g. it is wiped.
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Because of hotplugging, a wallet must request its client
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dynamically each time it is required, rather than caching it
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itself.
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The device manager is shared across plugins, so just one place
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does hardware scans when needed. By tracking HID IDs, if a device
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is plugged into a different port the wallet is automatically
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re-paired.
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Wallets are informed on connect / disconnect events. It must
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implement connected(), disconnected() callbacks. Being connected
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implies a pairing. Callbacks can happen in any thread context,
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and we do them without holding the lock.
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Confusingly, the HID ID (serial number) reported by the HID system
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doesn't match the device ID reported by the device itself. We use
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the HID IDs.
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This plugin is thread-safe. Currently only devices supported by
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hidapi are implemented.'''
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def __init__(self, config):
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super(DeviceMgr, self).__init__()
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# Keyed by xpub. The value is the device id
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# has been paired, and None otherwise.
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self.xpub_ids = {}
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# A list of clients. The key is the client, the value is
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# a (path, id_) pair.
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self.clients = {}
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# What we recognise. Each entry is a (vendor_id, product_id)
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# pair.
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self.recognised_hardware = set()
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# Custom enumerate functions for devices we don't know about.
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self.enumerate_func = set()
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# For synchronization
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self.lock = threading.RLock()
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self.hid_lock = threading.RLock()
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self.config = config
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def thread_jobs(self):
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# Thread job to handle device timeouts
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return [self]
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def run(self):
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'''Handle device timeouts. Runs in the context of the Plugins
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thread.'''
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with self.lock:
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clients = list(self.clients.keys())
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cutoff = time.time() - self.config.get_session_timeout()
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for client in clients:
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client.timeout(cutoff)
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def register_devices(self, device_pairs):
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for pair in device_pairs:
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self.recognised_hardware.add(pair)
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def register_enumerate_func(self, func):
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self.enumerate_func.add(func)
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def create_client(self, device, handler, plugin):
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# Get from cache first
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client = self.client_lookup(device.id_)
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if client:
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return client
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client = plugin.create_client(device, handler)
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if client:
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self.print_error("Registering", client)
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with self.lock:
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self.clients[client] = (device.path, device.id_)
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return client
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def xpub_id(self, xpub):
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with self.lock:
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return self.xpub_ids.get(xpub)
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def xpub_by_id(self, id_):
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with self.lock:
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for xpub, xpub_id in self.xpub_ids.items():
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if xpub_id == id_:
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return xpub
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return None
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def unpair_xpub(self, xpub):
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with self.lock:
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if not xpub in self.xpub_ids:
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return
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_id = self.xpub_ids.pop(xpub)
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self._close_client(_id)
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def unpair_id(self, id_):
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xpub = self.xpub_by_id(id_)
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if xpub:
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self.unpair_xpub(xpub)
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else:
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self._close_client(id_)
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def _close_client(self, id_):
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client = self.client_lookup(id_)
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self.clients.pop(client, None)
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if client:
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client.close()
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def pair_xpub(self, xpub, id_):
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with self.lock:
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self.xpub_ids[xpub] = id_
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def client_lookup(self, id_):
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with self.lock:
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for client, (path, client_id) in self.clients.items():
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if client_id == id_:
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return client
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return None
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def client_by_id(self, id_):
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'''Returns a client for the device ID if one is registered. If
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a device is wiped or in bootloader mode pairing is impossible;
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in such cases we communicate by device ID and not wallet.'''
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self.scan_devices()
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return self.client_lookup(id_)
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def client_for_keystore(self, plugin, handler, keystore, force_pair):
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self.print_error("getting client for keystore")
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if handler is None:
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raise Exception(_("Handler not found for") + ' ' + plugin.name + '\n' + _("A library is probably missing."))
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handler.update_status(False)
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devices = self.scan_devices()
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xpub = keystore.xpub
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derivation = keystore.get_derivation()
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client = self.client_by_xpub(plugin, xpub, handler, devices)
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if client is None and force_pair:
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info = self.select_device(plugin, handler, keystore, devices)
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client = self.force_pair_xpub(plugin, handler, info, xpub, derivation, devices)
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if client:
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handler.update_status(True)
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self.print_error("end client for keystore")
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return client
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def client_by_xpub(self, plugin, xpub, handler, devices):
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_id = self.xpub_id(xpub)
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client = self.client_lookup(_id)
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if client:
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# An unpaired client might have another wallet's handler
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# from a prior scan. Replace to fix dialog parenting.
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client.handler = handler
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return client
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for device in devices:
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if device.id_ == _id:
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return self.create_client(device, handler, plugin)
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def force_pair_xpub(self, plugin, handler, info, xpub, derivation, devices):
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# The wallet has not been previously paired, so let the user
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# choose an unpaired device and compare its first address.
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xtype = bitcoin.xpub_type(xpub)
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client = self.client_lookup(info.device.id_)
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if client and client.is_pairable():
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# See comment above for same code
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client.handler = handler
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# This will trigger a PIN/passphrase entry request
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try:
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client_xpub = client.get_xpub(derivation, xtype)
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except (UserCancelled, RuntimeError):
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# Bad / cancelled PIN / passphrase
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client_xpub = None
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if client_xpub == xpub:
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self.pair_xpub(xpub, info.device.id_)
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return client
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# The user input has wrong PIN or passphrase, or cancelled input,
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# or it is not pairable
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raise DeviceUnpairableError(
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_('Electrum-bitcoinprivate cannot pair with your {}.\n\n'
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'Before you request bitcoinprivate coins to be sent to addresses in this '
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'wallet, ensure you can pair with your device, or that you have '
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'its seed (and passphrase, if any). Otherwise all coins you '
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'receive will be unspendable.').format(plugin.device))
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def unpaired_device_infos(self, handler, plugin, devices=None):
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'''Returns a list of DeviceInfo objects: one for each connected,
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unpaired device accepted by the plugin.'''
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if not plugin.libraries_available:
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raise Exception('Missing libraries for {}'.format(plugin.name))
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if devices is None:
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devices = self.scan_devices()
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devices = [dev for dev in devices if not self.xpub_by_id(dev.id_)]
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infos = []
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for device in devices:
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if device.product_key not in plugin.DEVICE_IDS:
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continue
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client = self.create_client(device, handler, plugin)
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if not client:
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continue
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infos.append(DeviceInfo(device, client.label(), client.is_initialized()))
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return infos
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def select_device(self, plugin, handler, keystore, devices=None):
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'''Ask the user to select a device to use if there is more than one,
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and return the DeviceInfo for the device.'''
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while True:
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infos = self.unpaired_device_infos(handler, plugin, devices)
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if infos:
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break
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msg = _('Please insert your {}').format(plugin.device)
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if keystore.label:
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msg += ' ({})'.format(keystore.label)
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msg += '. {}\n\n{}'.format(
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_('Verify the cable is connected and that '
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'no other application is using it.'),
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_('Try to connect again?')
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)
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if not handler.yes_no_question(msg):
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raise UserCancelled()
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devices = None
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if len(infos) == 1:
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return infos[0]
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# select device by label
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for info in infos:
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if info.label == keystore.label:
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return info
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msg = _("Please select which {} device to use:").format(plugin.device)
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descriptions = [str(info.label) + ' (%s)'%(_("initialized") if info.initialized else _("wiped")) for info in infos]
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c = handler.query_choice(msg, descriptions)
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if c is None:
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raise UserCancelled()
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info = infos[c]
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# save new label
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keystore.set_label(info.label)
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if handler.win.wallet is not None:
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handler.win.wallet.save_keystore()
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return info
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def _scan_devices_with_hid(self):
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try:
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import hid
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except ImportError:
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return []
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with self.hid_lock:
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|
hid_list = hid.enumerate(0, 0)
|
|
|
|
devices = []
|
|
for d in hid_list:
|
|
product_key = (d['vendor_id'], d['product_id'])
|
|
if product_key in self.recognised_hardware:
|
|
# Older versions of hid don't provide interface_number
|
|
interface_number = d.get('interface_number', -1)
|
|
usage_page = d['usage_page']
|
|
id_ = d['serial_number']
|
|
if len(id_) == 0:
|
|
id_ = str(d['path'])
|
|
id_ += str(interface_number) + str(usage_page)
|
|
devices.append(Device(d['path'], interface_number,
|
|
id_, product_key, usage_page))
|
|
return devices
|
|
|
|
def scan_devices(self):
|
|
self.print_error("scanning devices...")
|
|
|
|
# First see what's connected that we know about
|
|
devices = self._scan_devices_with_hid()
|
|
|
|
# Let plugin handlers enumerate devices we don't know about
|
|
for f in self.enumerate_func:
|
|
try:
|
|
new_devices = f()
|
|
except BaseException as e:
|
|
self.print_error('custom device enum failed. func {}, error {}'
|
|
.format(str(f), str(e)))
|
|
else:
|
|
devices.extend(new_devices)
|
|
|
|
# find out what was disconnected
|
|
pairs = [(dev.path, dev.id_) for dev in devices]
|
|
disconnected_ids = []
|
|
with self.lock:
|
|
connected = {}
|
|
for client, pair in self.clients.items():
|
|
if pair in pairs and client.has_usable_connection_with_device():
|
|
connected[client] = pair
|
|
else:
|
|
disconnected_ids.append(pair[1])
|
|
self.clients = connected
|
|
|
|
# Unpair disconnected devices
|
|
for id_ in disconnected_ids:
|
|
self.unpair_id(id_)
|
|
|
|
return devices
|