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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
from twisted.conch import error
from twisted.conch.ssh import transport
from twisted.internet import defer, protocol, reactor
class SSHClientFactory(protocol.ClientFactory):
def __init__(self, d, options, verifyHostKey, userAuthObject):
self.d = d
self.options = options
self.verifyHostKey = verifyHostKey
self.userAuthObject = userAuthObject
def clientConnectionLost(self, connector, reason):
if self.options["reconnect"]:
connector.connect()
def clientConnectionFailed(self, connector, reason):
if self.d is None:
return
d, self.d = self.d, None
d.errback(reason)
def buildProtocol(self, addr):
trans = SSHClientTransport(self)
if self.options["ciphers"]:
trans.supportedCiphers = self.options["ciphers"]
if self.options["macs"]:
trans.supportedMACs = self.options["macs"]
if self.options["compress"]:
trans.supportedCompressions[0:1] = ["zlib"]
if self.options["host-key-algorithms"]:
trans.supportedPublicKeys = self.options["host-key-algorithms"]
return trans
class SSHClientTransport(transport.SSHClientTransport):
def __init__(self, factory):
self.factory = factory
self.unixServer = None
def connectionLost(self, reason):
if self.unixServer:
d = self.unixServer.stopListening()
self.unixServer = None
else:
d = defer.succeed(None)
d.addCallback(
lambda x: transport.SSHClientTransport.connectionLost(self, reason)
)
def receiveError(self, code, desc):
if self.factory.d is None:
return
d, self.factory.d = self.factory.d, None
d.errback(error.ConchError(desc, code))
def sendDisconnect(self, code, reason):
if self.factory.d is None:
return
d, self.factory.d = self.factory.d, None
transport.SSHClientTransport.sendDisconnect(self, code, reason)
d.errback(error.ConchError(reason, code))
def receiveDebug(self, alwaysDisplay, message, lang):
self._log.debug(
"Received Debug Message: {message}",
message=message,
alwaysDisplay=alwaysDisplay,
lang=lang,
)
if alwaysDisplay: # XXX what should happen here?
print(message)
def verifyHostKey(self, pubKey, fingerprint):
return self.factory.verifyHostKey(
self, self.transport.getPeer().host, pubKey, fingerprint
)
def setService(self, service):
self._log.info("setting client server to {service}", service=service)
transport.SSHClientTransport.setService(self, service)
if service.name != "ssh-userauth" and self.factory.d is not None:
d, self.factory.d = self.factory.d, None
d.callback(None)
def connectionSecure(self):
self.requestService(self.factory.userAuthObject)
def connect(host, port, options, verifyHostKey, userAuthObject):
d = defer.Deferred()
factory = SSHClientFactory(d, options, verifyHostKey, userAuthObject)
reactor.connectTCP(host, port, factory)
return d
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