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""" This module contains the implementation of the TCP forwarding, which allows clients and servers to forward arbitrary TCP data across the connection. Maintainer: Paul Swartz """ from __future__ import division, absolute_import import struct from twisted.internet import protocol, reactor from twisted.internet.endpoints import HostnameEndpoint, connectProtocol from twisted.python import log from twisted.python.compat import _PY3, unicode from twisted.conch.ssh import common, channel class SSHListenForwardingFactory(protocol.Factory): def __init__(self, connection, hostport, klass): self.conn = connection self.hostport = hostport # tuple self.klass = klass def buildProtocol(self, addr): channel = self.klass(conn = self.conn) client = SSHForwardingClient(channel) channel.client = client addrTuple = (addr.host, addr.port) channelOpenData = packOpen_direct_tcpip(self.hostport, addrTuple) self.conn.openChannel(channel, channelOpenData) return client class SSHListenForwardingChannel(channel.SSHChannel): def channelOpen(self, specificData): log.msg('opened forwarding channel %s' % self.id) if len(self.client.buf)>1: b = self.client.buf[1:] self.write(b) self.client.buf = b'' def openFailed(self, reason): self.closed() def dataReceived(self, data): self.client.transport.write(data) def eofReceived(self): self.client.transport.loseConnection() def closed(self): if hasattr(self, 'client'): log.msg('closing local forwarding channel %s' % self.id) self.client.transport.loseConnection() del self.client class SSHListenClientForwardingChannel(SSHListenForwardingChannel): name = b'direct-tcpip' class SSHListenServerForwardingChannel(SSHListenForwardingChannel): name = b'forwarded-tcpip' class SSHConnectForwardingChannel(channel.SSHChannel): """ Channel used for handling server side forwarding request. It acts as a client for the remote forwarding destination. @ivar hostport: C{(host, port)} requested by client as forwarding destination. @type hostport: L{tuple} or a C{sequence} @ivar client: Protocol connected to the forwarding destination. @type client: L{protocol.Protocol} @ivar clientBuf: Data received while forwarding channel is not yet connected. @type clientBuf: L{bytes} @var _reactor: Reactor used for TCP connections. @type _reactor: A reactor. @ivar _channelOpenDeferred: Deferred used in testing to check the result of C{channelOpen}. @type _channelOpenDeferred: L{twisted.internet.defer.Deferred} """ _reactor = reactor def __init__(self, hostport, *args, **kw): channel.SSHChannel.__init__(self, *args, **kw) self.hostport = hostport self.client = None self.clientBuf = b'' def channelOpen(self, specificData): """ See: L{channel.SSHChannel} """ log.msg("connecting to %s:%i" % self.hostport) ep = HostnameEndpoint( self._reactor, self.hostport[0], self.hostport[1]) d = connectProtocol(ep, SSHForwardingClient(self)) d.addCallbacks(self._setClient, self._close) self._channelOpenDeferred = d def _setClient(self, client): """ Called when the connection was established to the forwarding destination. @param client: Client protocol connected to the forwarding destination. @type client: L{protocol.Protocol} """ self.client = client log.msg("connected to %s:%i" % self.hostport) if self.clientBuf: self.client.transport.write(self.clientBuf) self.clientBuf = None if self.client.buf[1:]: self.write(self.client.buf[1:]) self.client.buf = b'' def _close(self, reason): """ Called when failed to connect to the forwarding destination. @param reason: Reason why connection failed. @type reason: L{twisted.python.failure.Failure} """ log.msg("failed to connect: %s" % reason) self.loseConnection() def dataReceived(self, data): """ See: L{channel.SSHChannel} """ if self.client: self.client.transport.write(data) else: self.clientBuf += data def closed(self): """ See: L{channel.SSHChannel} """ if self.client: log.msg('closed remote forwarding channel %s' % self.id) if self.client.channel: self.loseConnection() self.client.transport.loseConnection() del self.client def openConnectForwardingClient(remoteWindow, remoteMaxPacket, data, avatar): remoteHP, origHP = unpackOpen_direct_tcpip(data) return SSHConnectForwardingChannel(remoteHP, remoteWindow=remoteWindow, remoteMaxPacket=remoteMaxPacket, avatar=avatar) class SSHForwardingClient(protocol.Protocol): def __init__(self, channel): self.channel = channel self.buf = b'\000' def dataReceived(self, data): if self.buf: self.buf += data else: self.channel.write(data) def connectionLost(self, reason): if self.channel: self.channel.loseConnection() self.channel = None def packOpen_direct_tcpip(destination, source): """ Pack the data suitable for sending in a CHANNEL_OPEN packet. @type destination: L{tuple} @param destination: A tuple of the (host, port) of the destination host. @type source: L{tuple} @param source: A tuple of the (host, port) of the source host. """ (connHost, connPort) = destination (origHost, origPort) = source if isinstance(connHost, unicode): connHost = connHost.encode("utf-8") if isinstance(origHost, unicode): origHost = origHost.encode("utf-8") conn = common.NS(connHost) + struct.pack('>L', connPort) orig = common.NS(origHost) + struct.pack('>L', origPort) return conn + orig packOpen_forwarded_tcpip = packOpen_direct_tcpip def unpackOpen_direct_tcpip(data): """Unpack the data to a usable format. """ connHost, rest = common.getNS(data) if _PY3 and isinstance(connHost, bytes): connHost = connHost.decode("utf-8") connPort = int(struct.unpack('>L', rest[:4])[0]) origHost, rest = common.getNS(rest[4:]) if _PY3 and isinstance(origHost, bytes): origHost = origHost.decode("utf-8") origPort = int(struct.unpack('>L', rest[:4])[0]) return (connHost, connPort), (origHost, origPort) unpackOpen_forwarded_tcpip = unpackOpen_direct_tcpip def packGlobal_tcpip_forward(peer): """ Pack the data for tcpip forwarding. @param peer: A tuple of the (host, port) . @type peer: L{tuple} """ (host, port) = peer return common.NS(host) + struct.pack('>L', port) def unpackGlobal_tcpip_forward(data): host, rest = common.getNS(data) if _PY3 and isinstance(host, bytes): host = host.decode("utf-8") port = int(struct.unpack('>L', rest[:4])[0]) return host, port """This is how the data -> eof -> close stuff /should/ work. debug3: channel 1: waiting for connection debug1: channel 1: connected debug1: channel 1: read<=0 rfd 7 len 0 debug1: channel 1: read failed debug1: channel 1: close_read debug1: channel 1: input open -> drain debug1: channel 1: ibuf empty debug1: channel 1: send eof debug1: channel 1: input drain -> closed debug1: channel 1: rcvd eof debug1: channel 1: output open -> drain debug1: channel 1: obuf empty debug1: channel 1: close_write debug1: channel 1: output drain -> closed debug1: channel 1: rcvd close debug3: channel 1: will not send data after close debug1: channel 1: send close debug1: channel 1: is dead """