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# -*- test-case-name: twisted.conch.test.test_conch -*-
#
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
#
# $Id: conch.py,v 1.65 2004/03/11 00:29:14 z3p Exp $
# Implementation module for the `conch` command.
#
import fcntl
import getpass
import os
import signal
import struct
import sys
import tty
from typing import List, Tuple
from twisted.conch.client import connect, default
from twisted.conch.client.options import ConchOptions
from twisted.conch.error import ConchError
from twisted.conch.ssh import channel, common, connection, forwarding, session
from twisted.internet import reactor, stdio, task
from twisted.python import log, usage
from twisted.python.compat import ioType, networkString
class ClientOptions(ConchOptions):
synopsis = """Usage: conch [options] host [command]
"""
longdesc = (
"conch is a SSHv2 client that allows logging into a remote "
"machine and executing commands."
)
optParameters = [
["escape", "e", "~"],
[
"localforward",
"L",
None,
"listen-port:host:port Forward local port to remote address",
],
[
"remoteforward",
"R",
None,
"listen-port:host:port Forward remote port to local address",
],
]
optFlags = [
["null", "n", "Redirect input from /dev/null."],
["fork", "f", "Fork to background after authentication."],
["tty", "t", "Tty; allocate a tty even if command is given."],
["notty", "T", "Do not allocate a tty."],
["noshell", "N", "Do not execute a shell or command."],
["subsystem", "s", "Invoke command (mandatory) as SSH2 subsystem."],
]
compData = usage.Completions(
mutuallyExclusive=[("tty", "notty")],
optActions={
"localforward": usage.Completer(descr="listen-port:host:port"),
"remoteforward": usage.Completer(descr="listen-port:host:port"),
},
extraActions=[
usage.CompleteUserAtHost(),
usage.Completer(descr="command"),
usage.Completer(descr="argument", repeat=True),
],
)
localForwards: List[Tuple[int, Tuple[int, int]]] = []
remoteForwards: List[Tuple[int, Tuple[int, int]]] = []
def opt_escape(self, esc):
"""
Set escape character; ``none'' = disable
"""
if esc == "none":
self["escape"] = None
elif esc[0] == "^" and len(esc) == 2:
self["escape"] = chr(ord(esc[1]) - 64)
elif len(esc) == 1:
self["escape"] = esc
else:
sys.exit(f"Bad escape character '{esc}'.")
def opt_localforward(self, f):
"""
Forward local port to remote address (lport:host:port)
"""
localPort, remoteHost, remotePort = f.split(":") # Doesn't do v6 yet
localPort = int(localPort)
remotePort = int(remotePort)
self.localForwards.append((localPort, (remoteHost, remotePort)))
def opt_remoteforward(self, f):
"""
Forward remote port to local address (rport:host:port)
"""
remotePort, connHost, connPort = f.split(":") # Doesn't do v6 yet
remotePort = int(remotePort)
connPort = int(connPort)
self.remoteForwards.append((remotePort, (connHost, connPort)))
def parseArgs(self, host, *command):
self["host"] = host
self["command"] = " ".join(command)
# Rest of code in "run"
options = None
conn = None
exitStatus = 0
old = None
_inRawMode = 0
_savedRawMode = None
def run():
global options, old
args = sys.argv[1:]
if "-l" in args: # CVS is an idiot
i = args.index("-l")
args = args[i : i + 2] + args
del args[i + 2 : i + 4]
for arg in args[:]:
try:
i = args.index(arg)
if arg[:2] == "-o" and args[i + 1][0] != "-":
args[i : i + 2] = [] # Suck on it scp
except ValueError:
pass
options = ClientOptions()
try:
options.parseOptions(args)
except usage.UsageError as u:
print(f"ERROR: {u}")
options.opt_help()
sys.exit(1)
if options["log"]:
if options["logfile"]:
if options["logfile"] == "-":
f = sys.stdout
else:
f = open(options["logfile"], "a+")
else:
f = sys.stderr
realout = sys.stdout
log.startLogging(f)
sys.stdout = realout
else:
log.discardLogs()
doConnect()
fd = sys.stdin.fileno()
try:
old = tty.tcgetattr(fd)
except BaseException:
old = None
try:
oldUSR1 = signal.signal(
signal.SIGUSR1, lambda *a: reactor.callLater(0, reConnect)
)
except BaseException:
oldUSR1 = None
try:
reactor.run()
finally:
if old:
tty.tcsetattr(fd, tty.TCSANOW, old)
if oldUSR1:
signal.signal(signal.SIGUSR1, oldUSR1)
if (options["command"] and options["tty"]) or not options["notty"]:
signal.signal(signal.SIGWINCH, signal.SIG_DFL)
if sys.stdout.isatty() and not options["command"]:
print("Connection to {} closed.".format(options["host"]))
sys.exit(exitStatus)
def handleError():
from twisted.python import failure
global exitStatus
exitStatus = 2
reactor.callLater(0.01, _stopReactor)
log.err(failure.Failure())
raise
def _stopReactor():
try:
reactor.stop()
except BaseException:
pass
def doConnect():
if "@" in options["host"]:
options["user"], options["host"] = options["host"].split("@", 1)
if not options.identitys:
options.identitys = ["~/.ssh/id_rsa", "~/.ssh/id_dsa"]
host = options["host"]
if not options["user"]:
options["user"] = getpass.getuser()
if not options["port"]:
options["port"] = 22
else:
options["port"] = int(options["port"])
host = options["host"]
port = options["port"]
vhk = default.verifyHostKey
if not options["host-key-algorithms"]:
options["host-key-algorithms"] = default.getHostKeyAlgorithms(host, options)
uao = default.SSHUserAuthClient(options["user"], options, SSHConnection())
connect.connect(host, port, options, vhk, uao).addErrback(_ebExit)
def _ebExit(f):
global exitStatus
exitStatus = f"conch: exiting with error {f}"
reactor.callLater(0.1, _stopReactor)
def onConnect():
# if keyAgent and options['agent']:
# cc = protocol.ClientCreator(reactor, SSHAgentForwardingLocal, conn)
# cc.connectUNIX(os.environ['SSH_AUTH_SOCK'])
if hasattr(conn.transport, "sendIgnore"):
_KeepAlive(conn)
if options.localForwards:
for localPort, hostport in options.localForwards:
s = reactor.listenTCP(
localPort,
forwarding.SSHListenForwardingFactory(
conn, hostport, SSHListenClientForwardingChannel
),
)
conn.localForwards.append(s)
if options.remoteForwards:
for remotePort, hostport in options.remoteForwards:
log.msg(f"asking for remote forwarding for {remotePort}:{hostport}")
conn.requestRemoteForwarding(remotePort, hostport)
reactor.addSystemEventTrigger("before", "shutdown", beforeShutdown)
if not options["noshell"] or options["agent"]:
conn.openChannel(SSHSession())
if options["fork"]:
if os.fork():
os._exit(0)
os.setsid()
for i in range(3):
try:
os.close(i)
except OSError as e:
import errno
if e.errno != errno.EBADF:
raise
def reConnect():
beforeShutdown()
conn.transport.transport.loseConnection()
def beforeShutdown():
remoteForwards = options.remoteForwards
for remotePort, hostport in remoteForwards:
log.msg(f"cancelling {remotePort}:{hostport}")
conn.cancelRemoteForwarding(remotePort)
def stopConnection():
if not options["reconnect"]:
reactor.callLater(0.1, _stopReactor)
class _KeepAlive:
def __init__(self, conn):
self.conn = conn
self.globalTimeout = None
self.lc = task.LoopingCall(self.sendGlobal)
self.lc.start(300)
def sendGlobal(self):
d = self.conn.sendGlobalRequest(
b"conch-keep-alive@twistedmatrix.com", b"", wantReply=1
)
d.addBoth(self._cbGlobal)
self.globalTimeout = reactor.callLater(30, self._ebGlobal)
def _cbGlobal(self, res):
if self.globalTimeout:
self.globalTimeout.cancel()
self.globalTimeout = None
def _ebGlobal(self):
if self.globalTimeout:
self.globalTimeout = None
self.conn.transport.loseConnection()
class SSHConnection(connection.SSHConnection):
def serviceStarted(self):
global conn
conn = self
self.localForwards = []
self.remoteForwards = {}
onConnect()
def serviceStopped(self):
lf = self.localForwards
self.localForwards = []
for s in lf:
s.loseConnection()
stopConnection()
def requestRemoteForwarding(self, remotePort, hostport):
data = forwarding.packGlobal_tcpip_forward(("0.0.0.0", remotePort))
d = self.sendGlobalRequest(b"tcpip-forward", data, wantReply=1)
log.msg(f"requesting remote forwarding {remotePort}:{hostport}")
d.addCallback(self._cbRemoteForwarding, remotePort, hostport)
d.addErrback(self._ebRemoteForwarding, remotePort, hostport)
def _cbRemoteForwarding(self, result, remotePort, hostport):
log.msg(f"accepted remote forwarding {remotePort}:{hostport}")
self.remoteForwards[remotePort] = hostport
log.msg(repr(self.remoteForwards))
def _ebRemoteForwarding(self, f, remotePort, hostport):
log.msg(f"remote forwarding {remotePort}:{hostport} failed")
log.msg(f)
def cancelRemoteForwarding(self, remotePort):
data = forwarding.packGlobal_tcpip_forward(("0.0.0.0", remotePort))
self.sendGlobalRequest(b"cancel-tcpip-forward", data)
log.msg(f"cancelling remote forwarding {remotePort}")
try:
del self.remoteForwards[remotePort]
except Exception:
pass
log.msg(repr(self.remoteForwards))
def channel_forwarded_tcpip(self, windowSize, maxPacket, data):
log.msg(f"FTCP {data!r}")
remoteHP, origHP = forwarding.unpackOpen_forwarded_tcpip(data)
log.msg(self.remoteForwards)
log.msg(remoteHP)
if remoteHP[1] in self.remoteForwards:
connectHP = self.remoteForwards[remoteHP[1]]
log.msg(f"connect forwarding {connectHP}")
return SSHConnectForwardingChannel(
connectHP, remoteWindow=windowSize, remoteMaxPacket=maxPacket, conn=self
)
else:
raise ConchError(
connection.OPEN_CONNECT_FAILED, "don't know about that port"
)
def channelClosed(self, channel):
log.msg(f"connection closing {channel}")
log.msg(self.channels)
if len(self.channels) == 1: # Just us left
log.msg("stopping connection")
stopConnection()
else:
# Because of the unix thing
self.__class__.__bases__[0].channelClosed(self, channel)
class SSHSession(channel.SSHChannel):
name = b"session"
def channelOpen(self, foo):
log.msg(f"session {self.id} open")
if options["agent"]:
d = self.conn.sendRequest(
self, b"auth-agent-req@openssh.com", b"", wantReply=1
)
d.addBoth(lambda x: log.msg(x))
if options["noshell"]:
return
if (options["command"] and options["tty"]) or not options["notty"]:
_enterRawMode()
c = session.SSHSessionClient()
if options["escape"] and not options["notty"]:
self.escapeMode = 1
c.dataReceived = self.handleInput
else:
c.dataReceived = self.write
c.connectionLost = lambda x: self.sendEOF()
self.stdio = stdio.StandardIO(c)
fd = 0
if options["subsystem"]:
self.conn.sendRequest(self, b"subsystem", common.NS(options["command"]))
elif options["command"]:
if options["tty"]:
term = os.environ["TERM"]
winsz = fcntl.ioctl(fd, tty.TIOCGWINSZ, "12345678")
winSize = struct.unpack("4H", winsz)
ptyReqData = session.packRequest_pty_req(term, winSize, "")
self.conn.sendRequest(self, b"pty-req", ptyReqData)
signal.signal(signal.SIGWINCH, self._windowResized)
self.conn.sendRequest(self, b"exec", common.NS(options["command"]))
else:
if not options["notty"]:
term = os.environ["TERM"]
winsz = fcntl.ioctl(fd, tty.TIOCGWINSZ, "12345678")
winSize = struct.unpack("4H", winsz)
ptyReqData = session.packRequest_pty_req(term, winSize, "")
self.conn.sendRequest(self, b"pty-req", ptyReqData)
signal.signal(signal.SIGWINCH, self._windowResized)
self.conn.sendRequest(self, b"shell", b"")
# if hasattr(conn.transport, 'transport'):
# conn.transport.transport.setTcpNoDelay(1)
def handleInput(self, char):
if char in (b"\n", b"\r"):
self.escapeMode = 1
self.write(char)
elif self.escapeMode == 1 and char == options["escape"]:
self.escapeMode = 2
elif self.escapeMode == 2:
self.escapeMode = 1 # So we can chain escapes together
if char == b".": # Disconnect
log.msg("disconnecting from escape")
stopConnection()
return
elif char == b"\x1a": # ^Z, suspend
def _():
_leaveRawMode()
sys.stdout.flush()
sys.stdin.flush()
os.kill(os.getpid(), signal.SIGTSTP)
_enterRawMode()
reactor.callLater(0, _)
return
elif char == b"R": # Rekey connection
log.msg("rekeying connection")
self.conn.transport.sendKexInit()
return
elif char == b"#": # Display connections
self.stdio.write(b"\r\nThe following connections are open:\r\n")
channels = self.conn.channels.keys()
channels.sort()
for channelId in channels:
self.stdio.write(
networkString(
" #{} {}\r\n".format(
channelId, self.conn.channels[channelId]
)
)
)
return
self.write(b"~" + char)
else:
self.escapeMode = 0
self.write(char)
def dataReceived(self, data):
self.stdio.write(data)
def extReceived(self, t, data):
if t == connection.EXTENDED_DATA_STDERR:
log.msg(f"got {len(data)} stderr data")
if ioType(sys.stderr) == str:
sys.stderr.buffer.write(data)
else:
sys.stderr.write(data)
def eofReceived(self):
log.msg("got eof")
self.stdio.loseWriteConnection()
def closeReceived(self):
log.msg(f"remote side closed {self}")
self.conn.sendClose(self)
def closed(self):
global old
log.msg(f"closed {self}")
log.msg(repr(self.conn.channels))
def request_exit_status(self, data):
global exitStatus
exitStatus = int(struct.unpack(">L", data)[0])
log.msg(f"exit status: {exitStatus}")
def sendEOF(self):
self.conn.sendEOF(self)
def stopWriting(self):
self.stdio.pauseProducing()
def startWriting(self):
self.stdio.resumeProducing()
def _windowResized(self, *args):
winsz = fcntl.ioctl(0, tty.TIOCGWINSZ, "12345678")
winSize = struct.unpack("4H", winsz)
newSize = winSize[1], winSize[0], winSize[2], winSize[3]
self.conn.sendRequest(self, b"window-change", struct.pack("!4L", *newSize))
class SSHListenClientForwardingChannel(forwarding.SSHListenClientForwardingChannel):
pass
class SSHConnectForwardingChannel(forwarding.SSHConnectForwardingChannel):
pass
def _leaveRawMode():
global _inRawMode
if not _inRawMode:
return
fd = sys.stdin.fileno()
tty.tcsetattr(fd, tty.TCSANOW, _savedRawMode)
_inRawMode = 0
def _enterRawMode():
global _inRawMode, _savedRawMode
if _inRawMode:
return
fd = sys.stdin.fileno()
try:
old = tty.tcgetattr(fd)
new = old[:]
except BaseException:
log.msg("not a typewriter!")
else:
# iflage
new[0] = new[0] | tty.IGNPAR
new[0] = new[0] & ~(
tty.ISTRIP
| tty.INLCR
| tty.IGNCR
| tty.ICRNL
| tty.IXON
| tty.IXANY
| tty.IXOFF
)
if hasattr(tty, "IUCLC"):
new[0] = new[0] & ~tty.IUCLC
# lflag
new[3] = new[3] & ~(
tty.ISIG
| tty.ICANON
| tty.ECHO
| tty.ECHO
| tty.ECHOE
| tty.ECHOK
| tty.ECHONL
)
if hasattr(tty, "IEXTEN"):
new[3] = new[3] & ~tty.IEXTEN
# oflag
new[1] = new[1] & ~tty.OPOST
new[6][tty.VMIN] = 1
new[6][tty.VTIME] = 0
_savedRawMode = old
tty.tcsetattr(fd, tty.TCSANOW, new)
# tty.setraw(fd)
_inRawMode = 1
if __name__ == "__main__":
run()