python - 使用SSH中的SSH ProxyCommand的SFTP

Question

我正在使用以下SSH配置下载一些文件:

Host proxy
    Hostname      proxy.example.com
    User          proxyuser
    IdentityFile  ~/.ssh/proxy_id_rsa

Host target       # uses password auth
    Hostname      target.example.com
    User          targetuser
    ProxyCommand  ssh proxy nc %h %p

我正在尝试自动下载文件-当前使用paramiko，但如果更容易的话可以使用另一个库。

这是我根据其他答案尝试的方法:

from paramiko.proxy import ProxyCommand
from paramiko.transport import Transport
from paramiko.sftp_client import SFTPClient

proxy = ProxyCommand('ssh -i /Users/ben/.ssh/proxy_id_rsa proxyuser@proxy.example.com nc target.example.com 22')
client = SFTPClient(proxy)
client.connect(username='targetuser', password='targetpassword')

但是，这会引发错误

Traceback (most recent call last):
  File "sftp.py", line 6, in <module>
    client = SFTPClient(proxy)
  File "/Users/ben/.virtualenvs/venv/lib/python3.5/site-packages/paramiko/sftp_client.py", line 99, in __init__
    server_version = self._send_version()
  File "/Users/ben/.virtualenvs/venv/lib/python3.5/site-packages/paramiko/sftp.py", line 105, in _send_version
    t, data = self._read_packet()
  File "/Users/ben/.virtualenvs/venv/lib/python3.5/site-packages/paramiko/sftp.py", line 177, in _read_packet
    raise SFTPError('Garbage packet received')
paramiko.sftp.SFTPError: Garbage packet received

不幸的是，错误消息不是很有帮助，所以我不知所措。我无法更改 target上的配置，如果可以避免，我宁愿不更改 proxy上的配置。有什么建议么？

Answer 1

解决了以下问题:

class PatchedProxyCommand(ProxyCommand):
    # work around https://github.com/paramiko/paramiko/issues/789

    @property
    def closed(self):
        return self.process.returncode is not None

    @property
    def _closed(self):
        # Concession to Python 3 socket-like API
        return self.closed

    def close(self):
        self.process.kill()
        self.process.poll()

proxy = PatchedProxyCommand('ssh -i /Users/ben/.ssh/proxy_id_rsa '
                            'proxyuser@proxy.example.com nc target.example.com 22')

transport = Transport(proxy)
key = HostKeyEntry.from_line('target.example.com ssh-rsa '
                             'AAAAB3NzaC1yc2EAAAA/base64+stuff==').key
transport.connect(hostkey=key,
                  username='targetuser', password='targetpass')
sftp = SFTPClient.from_transport(transport)

print(sftp.listdir())