407 lines
14 KiB
Python
407 lines
14 KiB
Python
#!/usr/bin/env python
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#
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# Electrum - lightweight bitcoinprivate 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 socket
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import ssl
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import sys
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import threading
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import time
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import traceback
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import requests
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from .util import print_error
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ca_path = requests.certs.where()
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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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def Connection(server, queue, config_path):
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"""Makes asynchronous connections to a remote Electrum server.
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Returns the running thread that is making the connection.
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Once the thread has connected, it finishes, placing a tuple on the
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queue of the form (server, socket), where socket is None if
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connection failed.
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"""
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host, port, protocol = server.rsplit(':', 2)
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if not protocol in 'st':
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raise Exception('Unknown protocol: %s' % protocol)
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c = TcpConnection(server, queue, config_path)
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c.start()
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return c
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class TcpConnection(threading.Thread, util.PrintError):
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def __init__(self, server, queue, config_path):
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threading.Thread.__init__(self)
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self.config_path = config_path
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self.queue = queue
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self.server = server
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self.host, self.port, self.protocol = self.server.rsplit(':', 2)
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self.host = str(self.host)
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self.port = int(self.port)
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self.use_ssl = (self.protocol == 's')
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self.daemon = True
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def diagnostic_name(self):
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return self.host
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def check_host_name(self, peercert, name):
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"""Simple certificate/host name checker. Returns True if the
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certificate matches, False otherwise. Does not support
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wildcards."""
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# Check that the peer has supplied a certificate.
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# None/{} is not acceptable.
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if not peercert:
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return False
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if 'subjectAltName' in peercert:
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for typ, val in peercert["subjectAltName"]:
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if typ == "DNS" and val == name:
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return True
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else:
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# Only check the subject DN if there is no subject alternative
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# name.
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cn = None
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for attr, val in peercert["subject"]:
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# Use most-specific (last) commonName attribute.
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if attr == "commonName":
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cn = val
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if cn is not None:
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return cn == name
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return False
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def get_simple_socket(self):
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try:
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l = socket.getaddrinfo(self.host, self.port, socket.AF_UNSPEC, socket.SOCK_STREAM)
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except socket.gaierror:
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self.print_error("cannot resolve hostname")
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return
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e = None
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for res in l:
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try:
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s = socket.socket(res[0], socket.SOCK_STREAM)
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s.settimeout(10)
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s.connect(res[4])
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s.settimeout(2)
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s.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
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return s
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except BaseException as _e:
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e = _e
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continue
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else:
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self.print_error("failed to connect", str(e))
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@staticmethod
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def get_ssl_context(cert_reqs, ca_certs):
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context = ssl.create_default_context(purpose=ssl.Purpose.SERVER_AUTH, cafile=ca_certs)
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context.check_hostname = False
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context.verify_mode = cert_reqs
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context.options |= ssl.OP_NO_SSLv2
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context.options |= ssl.OP_NO_SSLv3
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context.options |= ssl.OP_NO_TLSv1
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return context
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def get_socket(self):
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if self.use_ssl:
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cert_path = os.path.join(self.config_path, 'certs', self.host)
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if not os.path.exists(cert_path):
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is_new = True
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s = self.get_simple_socket()
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if s is None:
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return
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# try with CA first
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try:
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context = self.get_ssl_context(cert_reqs=ssl.CERT_REQUIRED, ca_certs=ca_path)
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s = context.wrap_socket(s, do_handshake_on_connect=True)
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except ssl.SSLError as e:
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self.print_error(e)
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s = None
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except:
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return
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if s and self.check_host_name(s.getpeercert(), self.host):
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self.print_error("SSL certificate signed by CA")
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return s
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# get server certificate.
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# Do not use ssl.get_server_certificate because it does not work with proxy
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s = self.get_simple_socket()
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if s is None:
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return
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try:
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context = self.get_ssl_context(cert_reqs=ssl.CERT_NONE, ca_certs=None)
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s = context.wrap_socket(s)
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except ssl.SSLError as e:
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self.print_error("SSL error retrieving SSL certificate:", e)
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return
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except:
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return
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dercert = s.getpeercert(True)
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s.close()
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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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temporary_path = cert_path + '.temp'
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with open(temporary_path, "w", encoding='utf-8') as f:
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f.write(cert)
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f.flush()
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os.fsync(f.fileno())
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else:
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is_new = False
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s = self.get_simple_socket()
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if s is None:
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return
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if self.use_ssl:
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try:
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context = self.get_ssl_context(cert_reqs=ssl.CERT_REQUIRED,
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ca_certs=(temporary_path if is_new else cert_path))
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s = context.wrap_socket(s, do_handshake_on_connect=True)
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except socket.timeout:
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self.print_error('timeout')
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return
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except ssl.SSLError as e:
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self.print_error("SSL error:", e)
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if e.errno != 1:
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return
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if is_new:
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rej = cert_path + '.rej'
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if os.path.exists(rej):
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os.unlink(rej)
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os.rename(temporary_path, rej)
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else:
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with open(cert_path, encoding='utf-8') as f:
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cert = f.read()
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try:
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b = pem.dePem(cert, 'CERTIFICATE')
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x = x509.X509(b)
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except:
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traceback.print_exc(file=sys.stderr)
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self.print_error("wrong certificate")
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return
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try:
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x.check_date()
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except:
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self.print_error("certificate has expired:", cert_path)
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os.unlink(cert_path)
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return
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self.print_error("wrong certificate")
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if e.errno == 104:
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return
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return
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except BaseException as e:
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self.print_error(e)
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traceback.print_exc(file=sys.stderr)
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return
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if is_new:
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self.print_error("saving certificate")
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os.rename(temporary_path, cert_path)
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return s
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def run(self):
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socket = self.get_socket()
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if socket:
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self.print_error("connected")
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self.queue.put((self.server, socket))
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class Interface(util.PrintError):
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"""The Interface class handles a socket connected to a single remote
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Electrum server. Its exposed API is:
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- Member functions close(), fileno(), get_responses(), has_timed_out(),
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ping_required(), queue_request(), send_requests()
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- Member variable server.
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"""
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def __init__(self, server, socket):
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self.server = server
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self.host, _, _ = server.rsplit(':', 2)
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self.socket = socket
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self.pipe = util.SocketPipe(socket)
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self.pipe.set_timeout(0.0) # Don't wait for data
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# Dump network messages. Set at runtime from the console.
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self.debug = False
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self.unsent_requests = []
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self.unanswered_requests = {}
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# Set last ping to zero to ensure immediate ping
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self.last_request = time.time()
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self.last_ping = 0
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self.closed_remotely = False
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def diagnostic_name(self):
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return self.host
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def fileno(self):
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# Needed for select
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return self.socket.fileno()
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def close(self):
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if not self.closed_remotely:
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try:
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self.socket.shutdown(socket.SHUT_RDWR)
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except socket.error:
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pass
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self.socket.close()
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def queue_request(self, *args): # method, params, _id
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'''Queue a request, later to be send with send_requests when the
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socket is available for writing.
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'''
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self.request_time = time.time()
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self.unsent_requests.append(args)
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def num_requests(self):
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'''Keep unanswered requests below 100'''
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n = 100 - len(self.unanswered_requests)
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return min(n, len(self.unsent_requests))
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def send_requests(self):
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'''Sends queued requests. Returns False on failure.'''
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make_dict = lambda m, p, i: {'method': m, 'params': p, 'id': i}
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n = self.num_requests()
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wire_requests = self.unsent_requests[0:n]
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try:
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self.pipe.send_all([make_dict(*r) for r in wire_requests])
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except BaseException as e:
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self.print_error("pipe send error:", e)
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return False
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self.unsent_requests = self.unsent_requests[n:]
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for request in wire_requests:
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if self.debug:
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self.print_error("-->", request)
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self.unanswered_requests[request[2]] = request
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return True
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def ping_required(self):
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'''Maintains time since last ping. Returns True if a ping should
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be sent.
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'''
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now = time.time()
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if now - self.last_ping > 60:
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self.last_ping = now
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return True
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return False
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def has_timed_out(self):
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'''Returns True if the interface has timed out.'''
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if (self.unanswered_requests and time.time() - self.request_time > 10
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and self.pipe.idle_time() > 10):
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self.print_error("timeout", len(self.unanswered_requests))
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return True
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return False
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def get_responses(self):
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'''Call if there is data available on the socket. Returns a list of
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(request, response) pairs. Notifications are singleton
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unsolicited responses presumably as a result of prior
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subscriptions, so request is None and there is no 'id' member.
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Otherwise it is a response, which has an 'id' member and a
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corresponding request. If the connection was closed remotely
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or the remote server is misbehaving, a (None, None) will appear.
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'''
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responses = []
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while True:
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try:
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response = self.pipe.get()
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except util.timeout:
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break
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if not type(response) is dict:
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responses.append((None, None))
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if response is None:
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self.closed_remotely = True
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self.print_error("connection closed remotely")
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break
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if self.debug:
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self.print_error("<--", response)
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wire_id = response.get('id', None)
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if wire_id is None: # Notification
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responses.append((None, response))
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else:
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request = self.unanswered_requests.pop(wire_id, None)
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if request:
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responses.append((request, response))
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else:
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self.print_error("unknown wire ID", wire_id)
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responses.append((None, None)) # Signal
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break
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return responses
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def check_cert(host, cert):
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try:
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b = pem.dePem(cert, 'CERTIFICATE')
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x = x509.X509(b)
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except:
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traceback.print_exc(file=sys.stdout)
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return
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try:
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x.check_date()
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expired = False
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except:
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expired = True
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m = "host: %s\n"%host
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m += "has_expired: %s\n"% expired
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util.print_msg(m)
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# Used by tests
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def _match_hostname(name, val):
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if val == name:
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return True
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return val.startswith('*.') and name.endswith(val[1:])
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def test_certificates():
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from .simple_config import SimpleConfig
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config = SimpleConfig()
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mydir = os.path.join(config.path, "certs")
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certs = os.listdir(mydir)
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for c in certs:
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p = os.path.join(mydir,c)
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with open(p, encoding='utf-8') as f:
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cert = f.read()
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check_cert(c, cert)
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if __name__ == "__main__":
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test_certificates()
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