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import logging
import paramiko.client as pmc
from ._sshfp_policy import SSHFPPolicy
class SSHConnection:
"""
An SSH client connection to a remote server, with support for a proxy "jump"
host, like OpenSSH's 'ssh -J'. Uses only SSHFP for host key verification.
May be used as a context manager.
:param SSHRemote remote: Remote host to connect to.
"""
_proxy_conn = None
_client = None
_remote = None
_logger = None
def __init__(self, remote):
self._logger = logging.getLogger('%s.%s' % (self.__class__.__name__, str(remote)))
self._logger.debug('Connecting to remote host...')
sock = None
if remote.proxy_remote is not None:
self._proxy_conn = SSHConnection(remote.proxy_remote)
t = self._proxy_conn.get_transport()
sock = t.open_channel('direct-tcpip', (remote.host, remote.port), ('localhost', 0))
self._client = pmc.SSHClient()
self._client.set_missing_host_key_policy(SSHFPPolicy())
self._client.connect(remote.host, remote.port, remote.username,
sock = sock)
self._logger.debug('Connected to remote host')
self._remote = remote
def close(self):
self._logger.debug('Disconnecting from remote host')
if self._client:
self._client.close()
self._client = None
if self._proxy_conn:
self._proxy_conn.close()
self._proxy_conn = None
self._logger.debug('Disconnected from remote host')
def exec_command(self, *args, **kwargs):
return self._client.exec_command(*args, **kwargs)
def get_transport(self):
return self._client.get_transport()
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, traceback):
self.close()
def __str__(self):
return 'ssh:%s' % str(self._remote)
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