【发布时间】：2014-05-25 06:53:57
【问题描述】：
我正在使用 Paramiko 在远程服务器上执行 bash 脚本。在其中一些脚本中，存在与其他服务器的 ssh 连接。如果我只使用 bash，不使用 Python，我的 DSA 密钥会被第一个远程服务器上的 bash 脚本转发并用于连接到第二个远程服务器。当我使用 Paramiko 时，情况并非如此。
Bash 示例：
Jean@mydesktop:~ & ssh root@firstserver
root@firstserver:~ # ssh root@secondserver hostname
secondserver.mydomain.org
使用 Paramiko：
#!/usr/bin/python3
# -*- coding: utf-8 -*-
import paramiko
class SSHSession:
def __init__(self, server_address, user='root', port=22):
self.connected = False
self.server_address = server_address
self.user = user
self.port = port
def connect(self, clear_channel=True):
try:
if self.server_address == None:
raise ValueError('No hostname')
except:
raise ValueError('No hostname')
else:
try:
self.ssh_client = paramiko.SSHClient()
self.ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
self.ssh_client.connect(self.server_address, username=self.user)
#self.transport = self.ssh_client.get_transport()
#self.channel = self.transport.open_forward_agent_channel()
self.channel = self.ssh_client.invoke_shell()
except:
self.connected = False
return False
else:
self.connected = True
return True
def exec_command(self, command, newline='\r'):
if not self.connected:
raise Exception('Not connected')
else:
timeout = 31536000 # 365 days in seconds
self.channel.settimeout(timeout)
line_buffer = ''
channel_buffer = ''
end_string = 'CLIENT_EXPECT_CMD_OK'
print('[SEND ] >>', command)
self.channel.send(command + ' ; echo ' + end_string + newline)
while True:
channel_buffer = self.channel.recv(1).decode('UTF-8')
if len(channel_buffer) == 0:
raise Exception('connection lost with server: ' + self.server_address)
break
channel_buffer = channel_buffer.replace('\r', '')
if channel_buffer != '\n':
line_buffer += channel_buffer
else:
if line_buffer == end_string:
break
print('[RECEIVE] <<', line_buffer)
line_buffer = ''
def disconnect(self):
self.ssh_client.close()
def __enter__(self):
self.connect()
return self
def __exit__(self, _type, value, traceback):
self.disconnect()
if __name__ == "__main__":
server_address = 'firstserver'
ssh_user = 'root'
with SSHSession(server_address) as ssh_session:
ssh_session.exec_command('hostname')
ssh_session.exec_command('ssh root@secondserver hostname')
输出是：
[SEND ] >> hostname
[RECEIVE] << [root@firstserver ~]# hostname ; echo CLIENT_EXPECT_CMD_OK
[RECEIVE] << firstserver.mydomain.fr
[SEND ] >> ssh root@secondserver hostname
[RECEIVE] << [root@firstserver ~]# ssh root@secondserver hostname ; echo CLIENT_EXPECT_CMD_OK
[RECEIVE] << Permission denied (publickey,gssapi-keyex,gssapi-with-mic).
我试过了：
self.transport = self.ssh_client.get_transport()
self.channel = self.transport.open_forward_agent_channel()
而不是：
self.channel = self.ssh_client.invoke_shell()
然后我得到一个错误：
paramiko.ssh_exception.ChannelException: Administratively prohibited
有人知道这是否可能吗？我发现建议就是这样，但我不知道如何做到这一点。
【问题讨论】：
标签： python python-3.x paramiko