在脚本中使用 ssh（w/expect 或 paramiko）没有按预期工作

Question

我是 Python

的新手

我想编写 Python 脚本以使用 SSH 重启机器这是我的职能：

def sendCommandViaSSH(usr,psswrd,command):
    line = 'ssh '+ usr +'@'+ RIp + ' ' +"\""+ command+"\""
    print_message(line)
    child = pexpect.spawn (line)
    #i = child.expect('Are you sure you want to continue connecting (yes/no)?')
    i = child.expect (['Are you sure you want to continue connecting (yes/no)?', pexpect.EOF, pexpect.TIMEOUT],2)
    print_message(i)
    if i == 0:
        child.sendline ('yes')
    i = child.expect(['s password:', pexpect.EOF, pexpect.TIMEOUT])
    print_message(i)
    if i == 0:
        print_message(psswrd)
        child.sendline (psswrd)

我的问题是无法正常工作如果我运行手动执行相同的命令一切正常

示例输出：

ssh MyUsr@XXX.XXX.XXX.XXX "shutdown -k now"
2
0
MyPsswrd

如果我只是 copy/paste 从输出它工作 我的机器和遥控器都是 RedHat6.4 据我所知，它没有任何安全更改

有什么问题或有什么其他方法可以做到这一点？

编辑： 阅读评论后，我已经（返回）使用 paramiko_1.17.1 module 但是...问题仍然存在

以下：

1.code that i wrote so far
2.output that I get using it (while encountering the same problem of not working commands )

这是我的新代码：

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

def exec_paramiko(ssh, command):
    print_message("executing '{0}' on remote machine".format(command))
    chan = ssh.get_transport().open_session()
    chan.get_pty()
    f = chan.makefile()
    chan.exec_command(command)
    flag=True
    exit_code=None
    output=""
    while True:
        if chan.recv_ready():
            output+=(chan.recv(4096).decode('ascii') + "\n")
        if chan.recv_stderr_ready():
            output+=("error: {0}".format(chan.recv_stderr(4096).decode('ascii')))
        if chan.exit_status_ready():
            output+=(chan.recv(4096).decode('ascii') + "\n")
            error_string=0
            if chan.recv_stderr_ready():
                error_string=chan.recv_stderr(4096).decode('ascii')
            exit_code = chan.recv_exit_status()
            if exit_code != 0:
                output+="\nerror: {0}".format(error_string)
            break
    return exit_code, output

ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(hostname="10.xx.xx.xx",username="usr",password="psswrd",allow_agent=False,look_for_keys=False, timeout=20)
exit_code, output = exec_paramiko(ssh,'shutdown -k now' )
print "error code: {0} message: {1}".format(exit_code, output)

输出：

DEBUG:paramiko.transport:starting thread (client mode): 0xdb17c310L
DEBUG:paramiko.transport:Local version/idstring: SSH-2.0-paramiko_1.17.1
DEBUG:paramiko.transport:Remote version/idstring: SSH-2.0-OpenSSH_5.3
INFO:paramiko.transport:Connected (version 2.0, client OpenSSH_5.3)
DEBUG:paramiko.transport:kex algos:[u'diffie-hellman-group-exchange-sha256', u'diffie-hellman-group-exchange-sha1', u'diffie-hellman-group14-sha1', u'diffie-hellman-group1-sha1'] server key:[u'ssh-rsa', u'ssh-dss'] client encrypt:[u'aes128-ctr', u'aes192-ctr', u'aes256-ctr', u'arcfour256', u'arcfour128', u'aes128-cbc', u'3des-cbc', u'blowfish-cbc', u'cast128-cbc', u'aes192-cbc', u'aes256-cbc', u'arcfour', u'rijndael-cbc@lysator.liu.se'] server encrypt:[u'aes128-ctr', u'aes192-ctr', u'aes256-ctr', u'arcfour256', u'arcfour128', u'aes128-cbc', u'3des-cbc', u'blowfish-cbc', u'cast128-cbc', u'aes192-cbc', u'aes256-cbc', u'arcfour', u'rijndael-cbc@lysator.liu.se'] client mac:[u'hmac-md5', u'hmac-sha1', u'umac-64@openssh.com', u'hmac-ripemd160', u'hmac-ripemd160@openssh.com', u'hmac-sha1-96', u'hmac-md5-96'] server mac:[u'hmac-md5', u'hmac-sha1', u'umac-64@openssh.com', u'hmac-ripemd160', u'hmac-ripemd160@openssh.com', u'hmac-sha1-96', u'hmac-md5-96'] client compress:[u'none', u'zlib@openssh.com'] server compress:[u'none', u'zlib@openssh.com'] client lang:[u''] server lang:[u''] kex follows?False
DEBUG:paramiko.transport:Kex agreed: diffie-hellman-group1-sha1
DEBUG:paramiko.transport:Cipher agreed: aes128-ctr
DEBUG:paramiko.transport:MAC agreed: hmac-md5
DEBUG:paramiko.transport:Compression agreed: none
DEBUG:paramiko.transport:kex engine KexGroup1 specified hash_algo <built-in function openssl_sha1>
DEBUG:paramiko.transport:Switch to new keys ...
DEBUG:paramiko.transport:Adding ssh-rsa host key for xx.xx.xx.xx: 0c13035c7e4c0e3999d1c85215e97394
DEBUG:paramiko.transport:userauth is OK
INFO:paramiko.transport:Authentication (password) successful!
DEBUG:paramiko.transport:[chan 0] Max packet in: 32768 bytes
DEBUG:paramiko.transport:[chan 0] Max packet out: 32768 bytes
DEBUG:paramiko.transport:Secsh channel 0 opened.
DEBUG:paramiko.transport:[chan 0] Sesch channel 0 request ok
INFO:paramiko.transport.sftp:[chan 0] Opened sftp connection (server version 3)
shutting down
executing 'shutdown -k now' on remote machine
DEBUG:paramiko.transport:[chan 1] Max packet in: 32768 bytes
DEBUG:paramiko.transport:[chan 1] Max packet out: 32768 bytes
DEBUG:paramiko.transport:Secsh channel 1 opened.
DEBUG:paramiko.transport:[chan 1] Sesch channel 1 request ok
DEBUG:paramiko.transport:[chan 1] Sesch channel 1 request ok
DEBUG:paramiko.transport:[chan 1] EOF received (1)
DEBUG:paramiko.transport:[chan 1] EOF sent (1)
error code: 0 message: 

DEBUG:paramiko.transport:EOF in transport thread

Answer 1

这里有 sshpass，但我总是会使用 public 密钥。但是如果 public keys 是你不能做的事情，那么在 Python:

中进行子处理

sshpass -pfoobar ssh -o StrictHostKeyChecking=no user@host command_to_run

这是工具 url: https://sourceforge.net/projects/sshpass/

Answer 2

经过大量搜索和阅读，我发现了一些有用的东西

我的问题的原因是未知（如果发现与版本相关或通用的内容，我会尝试更新）

原码：

ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.exec_command(command)

修改后的代码：

ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())    
chan = ssh.get_transport().open_session()
#instead of ssh.exec_command(command)
chan.exec_command(command)

如果有人可以详细说明为什么工作，我想知道:)

在脚本中使用 ssh（w/expect 或 paramiko）没有按预期工作

using ssh in script (w/ expect or paramiko) not working as expected

python

ssh

redhat

paramiko