Working with paramiko

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这篇文章是来自http://segfault.in/2010/03/paramiko-ssh-and-sftp-with-python/，但我在最初学习时发现这篇文章还无法完全解决初学的我，我想初学paramiko看这篇文章也会出不少问题的，在这里，我将自己出的问题列出来，并且提供相关的解决方法，大家可以一边参考上面提供的URL，一边看我对这篇文章的学习过程。不过，单独看我写的也可以满足大家的学习的，不信，看下去，就知道了。

SSHClient is the main class provided by the paramkio module. It provides the basic interface you are going to want to use to instantiate server connections. The above code creates a new SSHClient object, and then calls ”connect()” to connect us to the local SSH server.

Here’s a simple example:

import paramiko

ssh = paramiko.SSHClient()

3 ssh.connect('192.168.1.2', username='vinod', password='screct')

这样将会报如下错误：

>>> ssh.connect('127.0.0.1',username='root',password='000000')

Traceback (most recent call last):

File "<stdin>", line 1, in ?

File "/usr/lib/python2.4/site-packages/paramiko/client.py", line 311, in connect

self._policy.missing_host_key(self, server_hostkey_name, server_key)

File "/usr/lib/python2.4/site-packages/paramiko/client.py", line 85, in missing_host_key

raise SSHException('Unknown server %s' % hostname)

paramiko.SSHException: Unknown server 127.0.0.1

解决方法：

Known_host="/root/.ssh/known_hosts"<=前提，这里应该存在与127.0.0.1有关的信息。

ssh.load_system_host_keys( known_host)

Another way is to use an SSH key:

import paramiko

import os

privatekeyfile = os.path.expanduser('~/.ssh/id_rsa')

mykey = paramiko.RSAKey.from_private_key_file(privatekeyfile)

ssh.connect('192.168.1.2', username = 'vinod', pkey = mykey)

注意:（这里的key，用的是RSA的key，我们在用ssh-keygen -t rsa来指定它，才可以在这里用，否则将会报无法识别的RSA KEY。而且如果你的RSA Key有密码的话，你还需要

mykey = paramiko.RSAKey.from_private_key_file(privatekeyfile,password='12345678')

不过，我们可以用publickey来登录的。

解法如下:

serverHost = "127.0.0.1"

serverPort = 22

userName = "root"

keyFile = "~/.ssh/badboy"

known_host = "~/.ssh/known_hosts"

channel = paramiko.SSHClient();

channel.load_system_host_keys( known_host )

channel.connect( serverHost, serverPort,username = userName, key_filename = keyFile )

）

Running Simple Commands

Lets run some simple commands on a remote machine.

import paramiko

ssh = paramiko.SSHClient()

ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) <=这样的话，就会报paramiko.SSHException: Unknown server

ssh.connect('beastie', username='vinod', password='secret')

stdin, stdout, stderr = ssh.exec_command('df -h')

print stdout.readlines()

ssh.close()

“paramiko.AutoAddPolicy()” which will auto-accept unknown keys.

Using sudo in running commands:

import paramiko

cmd = "sudo /etc/rc.d/apache2 restart"

ssh = paramiko.SSHClient()

ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

ssh.connect('beastie', username='vinod', password='secret')

stdin, stdout, stderr = ssh.exec_command(cmd)

stdin.write('secret\n')

stdin.flush()

print stdout.readlines()

ssh.close()

在这个例子中，无法运行，也无法解释，希望志同道合的朋友能给个解释!

Secure File Transfer Using SFTPClient

SFTPClient is used to open an sftp session across an open ssh Transport and do remote file operations.

An SSH Transport attaches to a stream (usually a socket), negotiates an encrypted session, authenticates, and then creates stream tunnels, called Channels, across the session. Multiple channels can be multiplexed across a single session (and often are, in the case of port forwardings).

以下是用密码认证功能登录的

#!/usr/bin/env python

import paramiko

socks=('127.0.0.1',22)

testssh=paramiko.Transport(socks)

testssh.connect(username='root',password='000000')

sftptest=paramiko.SFTPClient.from_transport(testssh)

remotepath="/tmp/a.log"

localpath="/tmp/c.log"

sftptest.put(remotepath,localpath)

sftptest.close()

testssh.close()

以下是用DSA认证登录的(PubkeyAuthentication)
#!/usr/bin/env python

import paramiko

serverHost = "192.168.1.172"

serverPort = 22

userName = "root"

keyFile = "/root/.ssh/zhuzhengjun"

known_host = "/root/.ssh/known_hosts"

channel = paramiko.SSHClient();

#host_keys = channel.load_system_host_keys(known_host)

channel.set_missing_host_key_policy(paramiko.AutoAddPolicy())

channel.connect(serverHost, serverPort,username=userName, key_filename=keyFile )

testssh=paramiko.Transport((serverHost,serverPort))

mykey = paramiko.DSSKey.from_private_key_file(keyFile,password='xyxyxy')

testssh.connect(username=userName,pkey=mykey)

sftptest=paramiko.SFTPClient.from_transport(testssh)

filepath='/tmp/e.log'

localpath='/tmp/a.log'

sftptest.put(localpath,filepath)

sftptest.close()

testssh.close()

以下是用RSA Key认证登录的

#!/usr/bin/evn python

import os

import paramiko

host='127.0.0.1'

port=22

testssh=paramiko.Transport((host,port))

privatekeyfile = os.path.expanduser('~/.ssh/badboy')

mykey = paramiko.RSAKey.from_private_key_file(privatekeyfile,password='000000')

username = 'root'

testssh.connect(username=username, pkey=mykey)

sftptest=paramiko.SFTPClient.from_transport(testssh)

filepath='/tmp/e.log'

localpath='/tmp/a.log'

sftptest.put(localpath,filepath)

sftptest.close()

testssh.close()

另一种方法：

在paramiko中使用用户名和密码通过sftp传输文件，不使用key文件。

import getpass

import select

import socket

import traceback

import paramiko

def putfile():

#import interactive

# setup logging

paramiko.util.log_to_file('demo.log')

username = username

hostname = hostname

port = 22

# now connect

try:

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

sock.connect((hostname, port))

except Exception, e:

print '*** Connect failed: ' + str(e)

traceback.print_exc()

sys.exit(1)

t = paramiko.Transport(sock)

try:

t.start_client()

except paramiko.SSHException:

print '*** SSH negotiation failed.'

sys.exit(1)

keys = {}

# check server's host key -- this is important.

key = t.get_remote_server_key()

# get username

t.auth_password(username, password)

sftp = paramiko.SFTPClient.from_transport(t)

# dirlist on remote host

d=datetime.date.today()-datetime.timedelta(1)

sftp.put(localFile,serverFile)

sftp.close()

t.close()

使用DSA认证登录的(PubkeyAuthentication)

#!/usr/bin/env python

import socket

import paramiko

import os

username='root'

hostname='192.168.1.169'

port = 22

sock=socket.socket(socket.AF_INET, socket.SOCK_STREAM)

sock.connect((hostname, port))

t=paramiko.Transport(sock)

t.start_client()

key=t.get_remote_server_key()

#t.auth_password(username,'000000')

privatekeyfile = os.path.expanduser('/root/.ssh/zhuzhengjun')

mykey=paramiko.DSSKey.from_private_key_file(privatekeyfile,password='061128')

t.auth_publickey(username,mykey)

sftp=paramiko.SFTPClient.from_transport(t)

sftp.put("/tmp/a.log","/tmp/h.log")

sftp.close()

t.close()

使用RSA Key验证

#!/usr/bin/env python

import socket

import paramiko

import os

username='root'

hostname='127.0.0.1'

port = 22

sock=socket.socket(socket.AF_INET, socket.SOCK_STREAM)

sock.connect((hostname, port))

t=paramiko.Transport(sock)

t.start_client()

key=t.get_remote_server_key()

#t.auth_password(username,'000000')

privatekeyfile = os.path.expanduser('~/.ssh/badboy')

mykey=paramiko.RSAKey.from_private_key_file(privatekeyfile,password='000000')

t.auth_publickey(username,mykey)

sftp=paramiko.SFTPClient.from_transport(t)

sftp.put("/tmp/a.log","/tmp/h.log")

sftp.close()

t.close()

我想大家看完应该对paramiko模块有一定的认识了，更全的大家可以参考paramiko的官方手册：

http://www.lag.net/paramiko/docs/

后绪，我将贴些我最近看的demo例子的解法，并且与paramiko有关的知识，如ssh-agent

大家加油!

本文出自 “坏男孩” 博客，请务必保留此出处http://5ydycm.blog.51cto.com/115934/340854

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