PyBitmessage-2021-04-27/src/network/tls.py

174 lines
7.1 KiB
Python
Raw Normal View History

"""
SSL/TLS negotiation.
"""
2017-04-16 18:27:15 +02:00
import os
import socket
import ssl
import sys
from debug import logger
2017-04-16 18:27:15 +02:00
from network.advanceddispatcher import AdvancedDispatcher
import network.asyncore_pollchoose as asyncore
from queues import receiveDataQueue
2017-04-16 18:27:15 +02:00
import paths
import protocol
_DISCONNECTED_SSL = frozenset((ssl.SSL_ERROR_EOF,))
2017-04-04 10:46:01 +02:00
class TLSDispatcher(AdvancedDispatcher):
def __init__(self, address=None, sock=None,
2017-04-04 10:46:01 +02:00
certfile=None, keyfile=None, server_side=False, ciphers=protocol.sslProtocolCiphers):
self.want_read = self.want_write = True
2017-04-04 10:46:01 +02:00
if certfile is None:
self.certfile = os.path.join(paths.codePath(), 'sslkeys', 'cert.pem')
else:
self.certfile = certfile
if keyfile is None:
self.keyfile = os.path.join(paths.codePath(), 'sslkeys', 'key.pem')
else:
self.keyfile = keyfile
self.server_side = server_side
self.ciphers = ciphers
2017-04-04 10:46:01 +02:00
self.tlsStarted = False
self.tlsDone = False
self.tlsVersion = "N/A"
2017-04-04 10:46:01 +02:00
self.isSSL = False
2017-04-04 10:46:01 +02:00
def state_tls_init(self):
self.isSSL = True
2017-04-16 18:27:15 +02:00
self.tlsStarted = True
# Once the connection has been established, it's safe to wrap the
# socket.
if sys.version_info >= (2,7,9):
context = ssl.create_default_context(purpose = ssl.Purpose.SERVER_AUTH if self.server_side else ssl.Purpose.CLIENT_AUTH)
context.set_ciphers(self.ciphers)
2017-04-04 10:46:01 +02:00
context.set_ecdh_curve("secp256k1")
context.check_hostname = False
context.verify_mode = ssl.CERT_NONE
# also exclude TLSv1 and TLSv1.1 in the future
2017-04-04 10:46:01 +02:00
context.options = ssl.OP_ALL | ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3 | ssl.OP_SINGLE_ECDH_USE | ssl.OP_CIPHER_SERVER_PREFERENCE
2017-04-16 18:27:15 +02:00
self.sslSocket = context.wrap_socket(self.socket, server_side = self.server_side, do_handshake_on_connect=False)
else:
self.sslSocket = ssl.wrap_socket(self.socket,
server_side=self.server_side,
ssl_version=protocol.sslProtocolVersion,
certfile=self.certfile,
keyfile=self.keyfile,
ciphers=self.ciphers,
do_handshake_on_connect=False)
self.sslSocket.setblocking(0)
self.want_read = self.want_write = True
self.set_state("tls_handshake")
return False
# if hasattr(self.socket, "context"):
# self.socket.context.set_ecdh_curve("secp256k1")
def state_tls_handshake(self):
return False
def writable(self):
try:
if self.tlsStarted and not self.tlsDone and not self.write_buf:
return self.want_write
2017-06-24 12:13:35 +02:00
return AdvancedDispatcher.writable(self)
except AttributeError:
2017-04-16 18:27:15 +02:00
return AdvancedDispatcher.writable(self)
def readable(self):
try:
# during TLS handshake, and after flushing write buffer, return status of last handshake attempt
if self.tlsStarted and not self.tlsDone and not self.write_buf:
#print "tls readable, %r" % (self.want_read)
return self.want_read
# prior to TLS handshake, receiveDataThread should emulate synchronous behaviour
elif not self.fullyEstablished and (self.expectBytes == 0 or not self.write_buf_empty()):
return False
2017-06-24 12:13:35 +02:00
return AdvancedDispatcher.readable(self)
except AttributeError:
2017-04-16 18:27:15 +02:00
return AdvancedDispatcher.readable(self)
def handle_read(self):
try:
# wait for write buffer flush
if self.tlsStarted and not self.tlsDone and not self.write_buf:
#logger.debug("%s:%i TLS handshaking (read)", self.destination.host, self.destination.port)
self.tls_handshake()
else:
#logger.debug("%s:%i Not TLS handshaking (read)", self.destination.host, self.destination.port)
return AdvancedDispatcher.handle_read(self)
except AttributeError:
2017-04-16 18:27:15 +02:00
return AdvancedDispatcher.handle_read(self)
except ssl.SSLError as err:
if err.errno == ssl.SSL_ERROR_WANT_READ:
return
elif err.errno in _DISCONNECTED_SSL:
self.handle_close()
return
logger.info("SSL Error: %s", str(err))
self.handle_close()
return
def handle_write(self):
try:
# wait for write buffer flush
if self.tlsStarted and not self.tlsDone and not self.write_buf:
#logger.debug("%s:%i TLS handshaking (write)", self.destination.host, self.destination.port)
self.tls_handshake()
else:
#logger.debug("%s:%i Not TLS handshaking (write)", self.destination.host, self.destination.port)
return AdvancedDispatcher.handle_write(self)
except AttributeError:
return AdvancedDispatcher.handle_write(self)
except ssl.SSLError as err:
if err.errno == ssl.SSL_ERROR_WANT_WRITE:
return 0
elif err.errno in _DISCONNECTED_SSL:
self.handle_close()
return 0
logger.info("SSL Error: %s", str(err))
self.handle_close()
return
def tls_handshake(self):
2017-04-16 18:27:15 +02:00
# wait for flush
2017-06-24 12:13:35 +02:00
if self.write_buf:
2017-04-16 18:27:15 +02:00
return False
# Perform the handshake.
try:
#print "handshaking (internal)"
self.sslSocket.do_handshake()
2017-06-24 12:13:35 +02:00
except ssl.SSLError as err:
#print "%s:%i: handshake fail" % (self.destination.host, self.destination.port)
self.want_read = self.want_write = False
if err.args[0] == ssl.SSL_ERROR_WANT_READ:
#print "want read"
self.want_read = True
if err.args[0] == ssl.SSL_ERROR_WANT_WRITE:
#print "want write"
self.want_write = True
if not (self.want_write or self.want_read):
raise
except socket.error as err:
if err.errno in asyncore._DISCONNECTED:
self.handle_close()
else:
raise
else:
if sys.version_info >= (2, 7, 9):
self.tlsVersion = self.sslSocket.version()
logger.debug("%s:%i: TLS handshake success, TLS protocol version: %s",
self.destination.host, self.destination.port, self.sslSocket.version())
else:
self.tlsVersion = "TLSv1"
logger.debug("%s:%i: TLS handshake success", self.destination.host, self.destination.port)
# The handshake has completed, so remove this channel and...
self.del_channel()
self.set_socket(self.sslSocket)
self.tlsDone = True
self.bm_proto_reset()
self.set_state("connection_fully_established")
receiveDataQueue.put(self.destination)
2017-04-16 18:27:15 +02:00
return False