/usr/lib/python2.7/dist-packages/gnutls/interfaces/twisted/__init__.py is in python-gnutls 3.0.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 | """GNUTLS Twisted interface"""
__all__ = ['X509Credentials', 'TLSContext', 'connectTLS', 'listenTLS']
from time import time
from twisted.python import failure
from twisted.internet import main, base, interfaces, abstract, tcp, error
from zope.interface import implementsOnly, implementedBy
from gnutls.connection import ClientSession, ServerSession, ServerSessionFactory
from gnutls.connection import TLSContext, X509Credentials as _X509Credentials
from gnutls.constants import SHUT_RDWR, SHUT_WR
from gnutls.errors import *
class KeepRunning:
"""Return this class from a recurrent function to indicate that it should keep running"""
pass
class RecurrentCall(object):
"""Execute a function repeatedly at the given interval, until signaled to stop"""
def __init__(self, period, func, *args, **kwargs):
from twisted.internet import reactor
self.func = func
self.args = args
self.kwargs = kwargs
self.period = period
self.now = None
self.next = None
self.callid = reactor.callLater(period, self)
def __call__(self):
from twisted.internet import reactor
self.callid = None
if self.now is None:
self.now = time()
self.next = self.now + self.period
else:
self.now, self.next = self.next, self.next + self.period
result = self.func(*self.args, **self.kwargs)
if result is KeepRunning:
delay = max(self.next-time(), 0)
self.callid = reactor.callLater(delay, self)
def cancel(self):
if self.callid is not None:
try:
self.callid.cancel()
except ValueError:
pass
self.callid = None
class CertificateOK: pass
class X509Credentials(_X509Credentials):
"""A Twisted enhanced X509Credentials"""
verify_peer = False
verify_period = None
def verify_callback(self, peer_cert, preverify_status=None):
"""Verifies the peer certificate and raises an exception if it cannot be accepted"""
if isinstance(preverify_status, Exception):
raise preverify_status
self.check_certificate(peer_cert, cert_name='peer certificate')
class TLSMixin:
"""TLS specific functionality common to both clients and servers"""
def getPeerCertificate(self):
return self.socket.peer_certificate
def doRead(self):
try:
return tcp.Connection.doRead(self)
except (OperationWouldBlock, OperationInterrupted):
return
except GNUTLSError, e:
return e
def writeSomeData(self, data):
try:
return tcp.Connection.writeSomeData(self, data)
except OperationInterrupted:
return self.writeSomeData(data)
except OperationWouldBlock:
return 0
except GNUTLSError, e:
return e
def _sendCloseReason(self, reason):
try:
self.socket.send_alert(reason)
except OperationInterrupted:
self._sendCloseReason(reason)
def _sendCloseAlert(self, how=SHUT_RDWR):
try:
self.socket.bye(how)
except OperationInterrupted:
self._sendCloseAlert(how)
def closeTLSSession(self, reason):
try:
self._sendCloseReason(reason)
self._sendCloseAlert(SHUT_RDWR)
except Exception:
pass
def _postLoseConnection(self):
self.closeTLSSession(self._close_reason)
return self._close_reason
def endTLSWrite(self):
self.stopWriting()
try:
self._sendCloseAlert(SHUT_WR)
except OperationWouldBlock, e:
if self.socket.interrupted_while_writing:
self.startWriting()
return
except Exception, e:
return e
del self.doWrite
def _closeWriteConnection(self):
self.doWrite = self.endTLSWrite
result = self.endTLSWrite()
if isinstance(result, Exception):
return result
return tcp.Connection._closeWriteConnection(self)
class TLSClient(TLSMixin, tcp.Client):
"""Add TLS capabilities to a TCP client"""
implementsOnly(interfaces.ISSLTransport, *[i for i in implementedBy(tcp.Client) if i != interfaces.ITLSTransport])
def __init__(self, host, port, bindAddress, context, connector, reactor=None, server_name=None):
self.context = context
self.server_name = server_name
self.__watchdog = None
tcp.Client.__init__(self, host, port, bindAddress, connector, reactor)
def createInternetSocket(self):
sock = tcp.Client.createInternetSocket(self)
return ClientSession(sock, self.context, self.server_name)
def _recurrentVerify(self):
if not self.connected or self.disconnecting:
return
try:
self.context.credentials.verify_callback(self.socket.peer_certificate)
except Exception, e:
self.loseConnection(e)
return
else:
return KeepRunning
def _verifyPeer(self):
session = self.socket
credentials = self.context.credentials
if not credentials.verify_peer:
return
try:
session.verify_peer()
except Exception, e:
preverify_status = e
else:
preverify_status = CertificateOK
credentials.verify_callback(session.peer_certificate, preverify_status)
if credentials.verify_period > 0:
self.__watchdog = RecurrentCall(credentials.verify_period, self._recurrentVerify)
def doHandshake(self):
self.stopWriting()
try:
self.socket.handshake()
except (OperationWouldBlock, OperationInterrupted):
if self.socket.interrupted_while_writing:
self.startWriting()
return
except GNUTLSError, e:
del self.doRead
self.failIfNotConnected(err = e)
return
## reset any references to the old doRead
del self.doRead
self.stopReading()
try:
self._verifyPeer()
except GNUTLSError, e:
self.closeTLSSession(e)
self.failIfNotConnected(err = e)
return
except Exception, e:
self.closeTLSSession(e)
self.failIfNotConnected(err = error.getConnectError(str(e)))
return
## TLS handshake (including certificate verification) finished succesfully
tcp.Client._connectDone(self)
def startTLS(self):
self.doRead = self.doHandshake
self.startReading()
self.doHandshake()
def _connectDone(self):
self.startTLS()
def loseConnection(self, reason=failure.Failure(main.CONNECTION_DONE)):
reason = failure.Failure(reason) # accept python exceptions too
self._close_reason = reason.value
abstract.FileDescriptor.loseConnection(self, reason)
def connectionLost(self, reason):
if self.__watchdog is not None:
self.__watchdog.cancel()
self.__watchdog = None
tcp.Client.connectionLost(self, reason)
class TLSConnector(base.BaseConnector):
def __init__(self, host, port, factory, context, timeout, bindAddress, reactor=None, server_name=None):
self.host = host
self.port = port
self.bindAddress = bindAddress
self.context = context
self.server_name = server_name
base.BaseConnector.__init__(self, factory, timeout, reactor)
def _makeTransport(self):
return TLSClient(self.host, self.port, self.bindAddress, self.context, self, self.reactor, self.server_name)
class TLSServer(TLSMixin, tcp.Server):
"""Add TLS capabilities to a TCP server"""
implementsOnly(interfaces.ISSLTransport, *[i for i in implementedBy(tcp.Server) if i != interfaces.ITLSTransport])
def __init__(self, sock, protocol, client, server, sessionno, *args, **kw):
self.__watchdog = None
self.context = server.context
tcp.Server.__init__(self, sock, protocol, client, server, sessionno, *args, **kw)
self.protocol.makeConnection = lambda *args: None
self.protocol.transport = self ## because we may call connectionLost without connectionMade
self.startTLS()
def _recurrentVerify(self):
if not self.connected or self.disconnecting:
return
try:
self.context.credentials.verify_callback(self.socket.peer_certificate)
except Exception, e:
self.loseConnection(e)
return
else:
return KeepRunning
def _verifyPeer(self):
session = self.socket
credentials = self.context.credentials
if not credentials.verify_peer:
return
try:
session.verify_peer()
except Exception, e:
preverify_status = e
else:
preverify_status = CertificateOK
credentials.verify_callback(session.peer_certificate, preverify_status)
if credentials.verify_period > 0:
self.__watchdog = RecurrentCall(credentials.verify_period, self._recurrentVerify)
def doHandshake(self):
self.stopWriting()
try:
self.socket.handshake()
except (OperationWouldBlock, OperationInterrupted):
if self.socket.interrupted_while_writing:
self.startWriting()
return
except GNUTLSError, e:
del self.doRead
return e
## reset any references to the old doRead
del self.doRead
self.stopReading()
self.startReading()
try:
self._verifyPeer()
except Exception, e:
self.loseConnection(e)
return
## TLS handshake (including certificate verification) finished succesfully
del self.protocol.makeConnection
self.protocol.makeConnection(self)
def startTLS(self):
self.doRead = self.doHandshake
self.startReading()
def loseConnection(self, reason=failure.Failure(main.CONNECTION_DONE)):
reason = failure.Failure(reason) # accept python exceptions too
self._close_reason = reason.value
abstract.FileDescriptor.loseConnection(self, reason)
def connectionLost(self, reason):
if self.__watchdog is not None:
self.__watchdog.cancel()
self.__watchdog = None
tcp.Server.connectionLost(self, reason)
class TLSPort(tcp.Port):
"""Add TLS capabilities to a TCP port"""
transport = TLSServer
def __init__(self, port, factory, context, backlog=50, interface='', reactor=None, session_class=ServerSession):
tcp.Port.__init__(self, port, factory, backlog, interface, reactor)
self.context = context
self.session_class = session_class
def createInternetSocket(self):
sock = tcp.Port.createInternetSocket(self)
return ServerSessionFactory(sock, self.context, self.session_class)
def connectTLS(reactor, host, port, factory, context, timeout=30, bindAddress=None, server_name=None):
c = TLSConnector(host, port, factory, context, timeout, bindAddress, reactor, server_name)
c.connect()
return c
def listenTLS(reactor, port, factory, context, backlog=50, interface='', session_class=ServerSession):
p = TLSPort(port, factory, context, backlog, interface, reactor, session_class)
p.startListening()
return p
## Add the connectTLS and listenTLS methods to the reactor
import new
from twisted.internet.posixbase import PosixReactorBase
method = new.instancemethod(connectTLS, None, PosixReactorBase)
setattr(PosixReactorBase, 'connectTLS', method)
method = new.instancemethod(listenTLS, None, PosixReactorBase)
setattr(PosixReactorBase, 'listenTLS', method)
|