CODEWITHSUNDEEP
pythonsshparamiko
voiceofthemany
voiceofthemany

Reputation: 31

Using agent forwarding with paramiko on Windows

I am trying to write a python script to execute a number of remote commands on a linux machine from Windows. I am using paramiko as the SSH connection library and running some fab scripts on the remote machine.

However, the fab scripts then connect to other machines so I need to use agent forwarding. However, whenever I run the code I get this error:

    Exception in thread Thread-3:
Traceback (most recent call last):
  File "C:\Python27\lib\threading.py", line 801, in __bootstrap_inner
    self.run()
  File "C:\Python27\lib\site-packages\paramiko\agent.py", line 117, in run
    raise AuthenticationException("Unable to connect to SSH agent")

I have copied verbatim several examples including: https://gist.github.com/toejough/436540622530c35404e6

It looks like I need to set up a local authentication agent as it is just forwarding to nothing, but I can't find out how to do that.

My code:

privkey = paramiko.RSAKey.from_private_key_file(PrivKeyDirFile, password = PrivKeyPw)

# Start the client
client = paramiko.client.SSHClient()
client.set_missing_host_key_policy(paramiko.client.AutoAddPolicy())
client.load_system_host_keys()
client.connect(hostname = Host, username = User, pkey = privkey)
# get a session
sshChannel = client.get_transport().open_session()
# set up the agent request handler to handle agent requests from the server
paramiko.agent.AgentRequestHandler(sshChannel)  # <--UNDOCUMENTED??!!
# get a shell
sshChannel.get_pty()
sshChannel.invoke_shell()

# SNIP

sshChannel.send

("command-which-invokes-fab-script\n")
# error now happens

Please help!

Upvotes: 2

Views: 875

Answers (1)

ArtOfWarfare
ArtOfWarfare

Reputation: 21486

Maybe I'm just too much a novice with SSH/paramiko, but I'm confused by everything starting on the line

# get a session

Why not just have:

# Connect the client as before ...
# Run the command:
stdin, stdout, stderr = client.exec_command('command-which-invokes-fab-script', get_pty = True)

Upvotes: 0

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