def circuitConnected(self):
"""
Initiate a ScrambleSuit handshake.
This method is only relevant for clients since servers never initiate
handshakes. If a session ticket is available, it is redeemed.
Otherwise, a UniformDH handshake is conducted.
"""
# The server handles the handshake passively.
if self.weAreServer:
return
# The preferred authentication mechanism is a session ticket.
bridge = self.circuit.downstream.transport.getPeer()
storedTicket = ticket.findStoredTicket(bridge)
if storedTicket is not None:
log.debug("Redeeming stored session ticket.")
(masterKey, rawTicket) = storedTicket
self.deriveSecrets(masterKey)
self.circuit.downstream.write(
ticket.createTicketMessage(rawTicket, self.sendHMAC))
# We switch to ST_CONNECTED opportunistically since we don't know
# yet whether the server accepted the ticket.
log.debug("Switching to state ST_CONNECTED.")
self.protoState = const.ST_CONNECTED
self.flushSendBuffer()
# Conduct an authenticated UniformDH handshake if there's no ticket.
else:
log.debug("No session ticket to redeem. Running UniformDH.")
self.circuit.downstream.write(self.uniformdh.createHandshake())
def circuitConnected( self ):
"""
Initiate a ScrambleSuit handshake.
This method is only relevant for clients since servers never initiate
handshakes. If a session ticket is available, it is redeemed.
Otherwise, a UniformDH handshake is conducted.
"""
# The server handles the handshake passively.
if self.weAreServer:
return
# The preferred authentication mechanism is a session ticket.
bridge = self.circuit.downstream.transport.getPeer()
storedTicket = ticket.findStoredTicket(bridge)
if storedTicket is not None:
log.debug("Redeeming stored session ticket.")
(masterKey, rawTicket) = storedTicket
self.deriveSecrets(masterKey)
self.circuit.downstream.write(ticket.createTicketMessage(rawTicket,
self.sendHMAC))
# We switch to ST_CONNECTED opportunistically since we don't know
# yet whether the server accepted the ticket.
log.debug("Switching to state ST_CONNECTED.")
self.protoState = const.ST_CONNECTED
self.flushSendBuffer()
# Conduct an authenticated UniformDH handshake if there's no ticket.
else:
log.debug("No session ticket to redeem. Running UniformDH.")
self.circuit.downstream.write(self.uniformdh.createHandshake())