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# -*- test-case-name: twisted.conch.test.test_default -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Accesses the key agent for user authentication.
Maintainer: Paul Swartz
"""
import os
from twisted.conch.ssh import agent, channel, keys
from twisted.internet import protocol, reactor
from twisted.logger import Logger
class SSHAgentClient(agent.SSHAgentClient):
_log = Logger()
def __init__(self):
agent.SSHAgentClient.__init__(self)
self.blobs = []
def getPublicKeys(self):
return self.requestIdentities().addCallback(self._cbPublicKeys)
def _cbPublicKeys(self, blobcomm):
self._log.debug("got {num_keys} public keys", num_keys=len(blobcomm))
self.blobs = [x[0] for x in blobcomm]
def getPublicKey(self):
"""
Return a L{Key} from the first blob in C{self.blobs}, if any, or
return L{None}.
"""
if self.blobs:
return keys.Key.fromString(self.blobs.pop(0))
return None
class SSHAgentForwardingChannel(channel.SSHChannel):
def channelOpen(self, specificData):
cc = protocol.ClientCreator(reactor, SSHAgentForwardingLocal)
d = cc.connectUNIX(os.environ["SSH_AUTH_SOCK"])
d.addCallback(self._cbGotLocal)
d.addErrback(lambda x: self.loseConnection())
self.buf = ""
def _cbGotLocal(self, local):
self.local = local
self.dataReceived = self.local.transport.write
self.local.dataReceived = self.write
def dataReceived(self, data):
self.buf += data
def closed(self):
if self.local:
self.local.loseConnection()
self.local = None
class SSHAgentForwardingLocal(protocol.Protocol):
pass
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