Python 与paramiko的x11转发

我正在尝试使用

paramiko

运行一个命令，该命令应该能够打开一个X窗口。我使用的脚本如下所示：

import paramiko                                    

ssh_client = paramiko.SSHClient()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh_client.connect('192.168.122.55', username='user', password='password')
transport = ssh_client.get_transport()
session = transport.open_session()

session.request_x11()
stdin = session.makefile('wb')
stdout = session.makefile('rb')
stderr = session.makefile_stderr('rb')
session.exec_command('env; xterm')
transport.accept()

print 'Exit status:', session.recv_exit_status()
print 'stdout:\n{}'.format(stdout.read())
print 'stderr:\n{}'.format(stderr.read())
session.close()

不幸的是，当我运行上面的脚本时，我得到以下输出：

Exit status: 1
stdout:
SHELL=/bin/bash
XDG_SESSION_COOKIE=8025e1ba5e6c47be0d2f3ad6504a25ee-1347286654.617967-1932974971
SSH_CLIENT=192.168.122.1 58654 22
USER=user
MAIL=/var/mail/user
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
PWD=/home/user
LANG=en_US.UTF-8
SHLVL=1
HOME=/home/user
LOGNAME=user
SSH_CONNECTION=192.168.122.1 58654 192.168.122.55 22
DISPLAY=localhost:10.0
_=/usr/bin/env

stderr:  
xterm: Xt error: Can't open display: localhost:10.0

如果在终端中运行以下命令：

ssh -X user@192.168.122.55 'env; xterm'

然后我得到了相同的环境变量（尽管有些端口已更改），因此我认为我的环境是正确的。但是，我仍然缺少使

paramiko

与x11转发一起工作的东西

我试过的几件事是：

• 使用

  request_x11

  中的

  handler

  参数：除了打印值之外，我没有得到比使用默认处理程序更进一步的结果
• 使用

  request_x11

  中的

  auth_cookie

  参数：尝试根据

  xauth列表

  输出对正在使用的cookie值进行硬编码。这样做的目的是避免根据

  paramiko

  本身中的文档字符串可能发生的问题：

如果省略auth_cookie，则将生成一个新的安全随机128位值 生成、使用和返回。您需要使用此值来 验证传入的x11请求并将其替换为实际的本地请求 x11 cookie（需要一些x11协议的知识）

我还可以做些什么来让它工作或解决问题

注: 这是以前在中提出的问题：

• ：唯一的响应指向我已尝试使用但无效的

  请求\u x11

  文档
• ：接受的响应建议使用

  处理程序

  参数，但它是错误的
• ：一年多没有答复

• x11

  请求可能使用了您可能无法正确处理的

  MIT-MAGIC-COOKIE-1

• 直接使用ssh，我发现需要确认x11请求（cookiechallenge？）

• .Xauthority

  文件也可能是一个问题
• 您可以尝试

  strace

  ssh进程并查看正常流程
• 在脚本中，您可以将

  xterm

  替换为

  strace xterm

  ，并与上述内容进行比较
一些链接：
祝你好运
编辑： 在Gary的答案上构建，具有多个x11连接

#!/usr/bin/env python

import os
import select
import sys
import getpass
import paramiko
import socket
import logging
import Xlib.support.connect as xlib_connect
LOGGER = logging.getLogger(__name__)

# connection settings
host = '192.168.122.55'
user = 'user'
password = getpass.getpass()

ssh_client = paramiko.SSHClient()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh_client.connect(host, username=user, password=password)
del password

# maintain map
# { fd: (channel, remote channel), ... }
channels = {}

poller = select.poll()
def x11_handler(channel, (src_addr, src_port)):
    '''handler for incoming x11 connections
    for each x11 incoming connection,
    - get a connection to the local display
    - maintain bidirectional map of remote x11 channel to local x11 channel
    - add the descriptors to the poller
    - queue the channel (use transport.accept())'''
    x11_chanfd = channel.fileno()
    local_x11_socket = xlib_connect.get_socket(*local_x11_display[:3])
    local_x11_socket_fileno = local_x11_socket.fileno()
    channels[x11_chanfd] = channel, local_x11_socket
    channels[local_x11_socket_fileno] = local_x11_socket, channel
    poller.register(x11_chanfd, select.POLLIN)
    poller.register(local_x11_socket, select.POLLIN)
    LOGGER.debug('x11 channel on: %s %s', src_addr, src_port)
    transport._queue_incoming_channel(channel)

def flush_out(session):
    while session.recv_ready():
        sys.stdout.write(session.recv(4096))
    while session.recv_stderr_ready():
        sys.stderr.write(session.recv_stderr(4096))

# get local disply
local_x11_display = xlib_connect.get_display(os.environ['DISPLAY'])
# start x11 session
transport = ssh_client.get_transport()
session = transport.open_session()
session.request_x11(handler=x11_handler)
session.exec_command('xterm')
session_fileno = session.fileno()
poller.register(session_fileno, select.POLLIN)
# accept first remote x11 connection
transport.accept()

# event loop
while not session.exit_status_ready():
    poll = poller.poll()
    # accept subsequent x11 connections if any
    if len(transport.server_accepts) > 0:
        transport.accept()
    if not poll: # this should not happen, as we don't have a timeout.
        break
    for fd, event in poll:
        if fd == session_fileno:
            flush_out(session)
        # data either on local/remote x11 socket
        if fd in channels.keys():
            channel, counterpart = channels[fd]
            try:
                # forward data between local/remote x11 socket.
                data = channel.recv(4096)
                counterpart.sendall(data)
            except socket.error:
                channel.close()
                counterpart.close()
                del channels[fd]

print 'Exit status:', session.recv_exit_status()
flush_out(session)
session.close()

---

在阅读paramiko代码时，我意识到paramiko只实现了一种建立x11通道的方法。它没有将通道连接到本地x11显示器。那就留给你了
下面是我刚刚编写的一个小实现：

#!/usr/bin/env python

import os
import select
import sys

import paramiko
import Xlib.support.connect as xlib_connect


local_x11_display = xlib_connect.get_display(os.environ['DISPLAY'])
local_x11_socket = xlib_connect.get_socket(*local_x11_display[:3])


ssh_client = paramiko.SSHClient()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh_client.connect('server', username='username', password='password')
transport = ssh_client.get_transport()
session = transport.open_session()
session.request_x11(single_connection=True)
session.exec_command('xterm')
x11_chan = transport.accept()

session_fileno = session.fileno()
x11_chan_fileno = x11_chan.fileno()
local_x11_socket_fileno = local_x11_socket.fileno()

poller = select.poll()
poller.register(session_fileno, select.POLLIN)
poller.register(x11_chan_fileno, select.POLLIN)
poller.register(local_x11_socket, select.POLLIN)
while not session.exit_status_ready():
    poll = poller.poll()
    if not poll: # this should not happen, as we don't have a timeout.
        break
    for fd, event in poll:
        if fd == session_fileno:
            while session.recv_ready():
                sys.stdout.write(session.recv(4096))
            while session.recv_stderr_ready():
                sys.stderr.write(session.recv_stderr(4096))
        if fd == x11_chan_fileno:
            local_x11_socket.sendall(x11_chan.recv(4096))
        if fd == local_x11_socket_fileno:
            x11_chan.send(local_x11_socket.recv(4096))

print 'Exit status:', session.recv_exit_status()
while session.recv_ready():
    sys.stdout.write(session.recv(4096))
while session.recv_stderr_ready():
    sys.stdout.write(session.recv_stderr(4096))
session.close()

一些注意事项：
• 我正在使用python Xlib中的一些辅助函数。这是Xlib的纯python实现。有关安装的详细信息，请参见此问题：

• 我如何实现这个的一些细节让我相信它只适用于1 x11连接（因此

  session.request_x11（single_connection=True）

  ），我想继续这样做，让它处理多个连接，但这将不得不再等一天

• 此代码基本上使用以下命令以异步方式将以下通道/套接字连接在一起：

  • session.stdout

    ->

    sys.stdout

  • session.stderr

    ->

    sys.stderr

  • x11频道

    ->

    local\u x11\u插座

  • local\u x11\u插座

    ->

    x11频道

• paramiko

  模块向

  logging

  模块输出大量有用的调试信息。您可以通过配置日志记录模块来查看：

  import logging
  logging.basicConfig(level=logging.DEBUG)
  

---

鉴于您要求的是最低版本，我认为这会使其尽可能易于使用。这是一个基于这两种代码的版本，但这将x11会话命令与常规代码分开，从而使主程序简单，会话代码可重用：

import paramiko
import os
import select
import sys
import Xlib.support.connect as xlib_connect

def run(transport, session, command):
    def x11_handler(channel, (src_addr, src_port)):
        x11_fileno = channel.fileno()
        local_x11_channel = xlib_connect.get_socket(*local_x11_display[:3])
        local_x11_fileno = local_x11_channel.fileno()

        # Register both x11 and local_x11 channels
        channels[x11_fileno] = channel, local_x11_channel
        channels[local_x11_fileno] = local_x11_channel, channel

        poller.register(x11_fileno, select.POLLIN)
        poller.register(local_x11_fileno, select.POLLIN)

        transport._queue_incoming_channel(channel)

    def flush_out(channel):
        while channel.recv_ready():
            sys.stdout.write(channel.recv(4096))
        while channel.recv_stderr_ready():
            sys.stderr.write(channel.recv_stderr(4096))

    local_x11_display = xlib_connect.get_display(os.environ['DISPLAY'])

    channels = {}
    poller = select.poll()
    session_fileno = session.fileno()
    poller.register(session_fileno)

    session.request_x11(handler=x11_handler)
    session.exec_command(command)
    transport.accept()

    # event loop
    while not session.exit_status_ready():
        poll = poller.poll()
        if not poll: # this should not happen, as we don't have a timeout.
            break
        for fd, event in poll:
            if fd == session_fileno:
                flush_out(session)
            # data either on local/remote x11 channels/sockets
            if fd in channels.keys():
                sender, receiver = channels[fd]
                try:
                    receiver.sendall(sender.recv(4096))
                except:
                    sender.close()
                    receiver.close()
                    channels.remove(fd)

    flush_out(session)
    return session.recv_exit_status()

if __name__ == '__main__':
    ssh_client = paramiko.SSHClient()
    ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    ssh_client.connect('192.168.122.55', username='user', password='password')
    transport = ssh_client.get_transport()
    session = transport.open_session()
    run(transport, session, 'xterm')

我知道你可以自己做。但是，只要复制函数

run

，任何人都可以毫不费力地使用它

---

正确的答案是。这个例子是为了让新手更容易。对于那些在Mac OS X Leopard中工作的人来说，没有select.poll（）。下面是使用kqueue而不是poll的修改版本。如有任何改进/更正，将不胜感激

#!/usr/bin/env python

import os
import select
import sys
import paramiko
import socket
import Xlib.support.connect as xlib_connect

# get local display
local_x11_display = xlib_connect.get_display(os.environ['DISPLAY'])

ssh_client = paramiko.SSHClient()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh_client.connect('hostname', port=22, username='username', password='password')

channels = {}
kq = select.kqueue()

def x11Handler(x11_chan, (src_addr, src_port)):
    x11_chan_fileno = x11_chan.fileno()
    local_x11_socket = xlib_connect.get_socket(*local_x11_display[:3])
    local_x11_socket_fileno = local_x11_socket.fileno()
    channels[x11_chan_fileno] = x11_chan, local_x11_socket
    channels[local_x11_socket_fileno] = local_x11_socket, x11_chan

    ev = [select.kevent(x11_chan_fileno, filter=select.KQ_FILTER_READ, flags=select.KQ_EV_ADD), select.kevent(local_x11_socket_fileno, filter=select.KQ_FILTER_READ, flags=select.KQ_EV_ADD)]
    kevents = kq.control(ev, 0, None)
    transport._queue_incoming_channel(x11_chan)

def flushOut(session):
    while session.recv_ready():
        sys.stdout.write(session.recv(4096))
    while session.recv_stderr_ready():
        sys.stderr.write(session.recv_stderr(4096))

# start x11 session
transport = ssh_client.get_transport()
session = transport.open_session()
session.request_x11(handler=x11Handler)
session.exec_command('xterm')

# accept first remote x11 connection
x11_chan = transport.accept()
session_fileno = session.fileno()

session_ev = [select.kevent(session_fileno, 
    filter=select.KQ_FILTER_READ,
    flags=select.KQ_EV_ADD)] 

kevents_session = kq.control(session_ev, 0, None)

# event loop
while not session.exit_status_ready():
    r_events = kq.control(None, 4)
    # accept subsequent x11 connections if any

    if len(transport.server_accepts) > 0:
        transport.accept()
    if not r_events: # this should not happen, as we don't have a timeout.
        break
    for event in r_events:
        print event
        if event.ident & session_fileno:
            flushOut(session)
        # data either on local/remote x11 socket
        if event.ident in channels.keys():
            x11_chan, counterpart = channels[event.ident]
            try:
                # forward data between local/remote x11 socket.
                data = x11_chan.recv(4096)
                counterpart.sendall(data)
            except socket.error:
                x11_chan.close()
                counterpart.close()
                del channels[event.ident]

flushOut(session)
kq.close()
session.close()

---

感谢Gary van der Merwe和dnozay的代码。下面的代码严重依赖它，用于在Windows上运行X程序。显著的区别是使用select.select而不是poll，因为poll在Windows中不可用。欢迎任何改进或更正

import select
import sys
import paramiko
import Xlib.support.connect as xlib_connect
import os
import socket
import subprocess



# run xming
XmingProc = subprocess.Popen("C:/Program Files (x86)/Xming/Xming.exe :0 -clipboard -multiwindow")
ssh_client = paramiko.SSHClient()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh_client.connect(SSHServerIP, SSHServerPort, username=user, password=pwd)
transport = ssh_client.get_transport()
channelOppositeEdges = {}

local_x11_display = xlib_connect.get_display(os.environ['DISPLAY'])
inputSockets = []

def x11_handler(channel, (src_addr, src_port)):
    local_x11_socket = xlib_connect.get_socket(*local_x11_display[:3])
    inputSockets.append(local_x11_socket)
    inputSockets.append(channel)
    channelOppositeEdges[local_x11_socket.fileno()] = channel
    channelOppositeEdges[channel.fileno()] = local_x11_socket
    transport._queue_incoming_channel(channel)

session = transport.open_session()
inputSockets.append(session)
session.request_x11(handler = x11_handler)
session.exec_command('xterm')
transport.accept()

while not session.exit_status_ready():
    readable, writable, exceptional = select.select(inputSockets,[],[])
    if len(transport.server_accepts) > 0:
        transport.accept()
    for sock in readable:
        if sock is session:
            while session.recv_ready():
                sys.stdout.write(session.recv(4096))
            while session.recv_stderr_ready():
                sys.stderr.write(session.recv_stderr(4096))   
        else: 
            try:
                data = sock.recv(4096)
                counterPartSocket  = channelOppositeEdges[sock.fileno()]
                counterPartSocket.sendall(data)
            except socket.error:
                inputSockets.remove(sock)
                inputSockets.remove(counterPartSocket)
                del channelOppositeEdges[sock.fileno()]
                del channelOppositeEdges[counterPartSocket.fileno()]
                sock.close()
                counterPartSocket.close()

print 'Exit status:', session.recv_exit_status()
while session.recv_ready():
    sys.stdout.write(session.recv(4096))
while session.recv_stderr_ready():
    sys.stdout.write(session.recv_stderr(4096))
session.close()
XmingProc.terminate()
XmingProc.wait()

---

在paramico会话处于活动状态时：（1）在远程计算机上以root用户身份运行

netstat-lpn

。它是否侦听端口6010，地址127.0.0.1？（2）

ls-l~user/.Xauthority

是怎么说的？你能提供一个对你有用的最小示例的来源吗？这是对我有用的答案。我仍然会把这个例子翻译成真实的代码，但我认为这会很有帮助。谢谢你的回复。我一直在看你的例子；但是，尽管很有希望，但对于我尝试过的其他命令，它似乎不起作用。例如，如果我尝试

gnome终端

我会得到

自动启动错误：X11初始化失败。

如果我尝试

firefox

，我会得到

错误：无法打开显示：localhost:10.0

。其他两个答案声称基于您的答案，因此您获得奖金是公平的。再次感谢，谢谢你们的代码。我有两条评论，第一条是python xlib

get_socket

函数在版本0.26中使用4个参数，因此调用应该是

xlib_connect.get_socket（*local_x11_display[：4]）

。在X11握手过程中，我还遇到了一个

无效的MIT-MAGIC-COOKIE-1键错误

，因此我必须使用

xhost+

打开访问权限，这通常在<