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object --+ | SSHClient
A high-level representation of a session with an SSH server. This class wraps `.Transport`, `.Channel`, and `.SFTPClient` to take care of most aspects of authenticating and opening channels. A typical use case is:
client = SSHClient() client.load_system_host_keys() client.connect('ssh.example.com') stdin, stdout, stderr = client.exec_command('ls -l')
You may pass in explicit overrides for authentication and server host key checking. The default mechanism is to try to use local key files or an SSH agent (if one is running).
.. versionadded:: 1.6
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Inherited from |
Properties | |
Inherited from |
Method Details |
Create a new SSHClient.
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Load host keys from a system (read-only) file. Host keys read with this method will not be saved back by `save_host_keys`. This method can be called multiple times. Each new set of host keys will be merged with the existing set (new replacing old if there are conflicts). If ``filename`` is left as ``None``, an attempt will be made to read keys from the user's local "known hosts" file, as used by OpenSSH, and no exception will be raised if the file can't be read. This is probably only useful on posix. :param str filename: the filename to read, or ``None`` :raises IOError: if a filename was provided and the file could not be read |
Load host keys from a local host-key file. Host keys read with this method will be checked after keys loaded via `load_system_host_keys`, but will be saved back by `save_host_keys` (so they can be modified). The missing host key policy `.AutoAddPolicy` adds keys to this set and saves them, when connecting to a previously-unknown server. This method can be called multiple times. Each new set of host keys will be merged with the existing set (new replacing old if there are conflicts). When automatically saving, the last hostname is used. :param str filename: the filename to read :raises IOError: if the filename could not be read |
Save the host keys back to a file. Only the host keys loaded with `load_host_keys` (plus any added directly) will be saved -- not any host keys loaded with `load_system_host_keys`. :param str filename: the filename to save to :raises IOError: if the file could not be written |
Get the local `.HostKeys` object. This can be used to examine the local host keys or change them. :return: the local host keys as a `.HostKeys` object. |
Set the channel for logging. The default is ``"paramiko.transport"`` but it can be set to anything you want. :param str name: new channel name for logging |
Set the policy to use when connecting to a server that doesn't have a host key in either the system or local `.HostKeys` objects. The default policy is to reject all unknown servers (using `.RejectPolicy`). You may substitute `.AutoAddPolicy` or write your own policy class. :param .MissingHostKeyPolicy policy: the policy to use when receiving a host key from a previously-unknown server |
Connect to an SSH server and authenticate to it. The server's host key is checked against the system host keys (see `load_system_host_keys`) and any local host keys (`load_host_keys`). If the server's hostname is not found in either set of host keys, the missing host key policy is used (see `set_missing_host_key_policy`). The default policy is to reject the key and raise an `.SSHException`. Authentication is attempted in the following order of priority: - The ``pkey`` or ``key_filename`` passed in (if any) - Any key we can find through an SSH agent - Any "id_rsa" or "id_dsa" key discoverable in ``~/.ssh/`` - Plain username/password auth, if a password was given If a private key requires a password to unlock it, and a password is passed in, that password will be used to attempt to unlock the key. :param str hostname: the server to connect to :param int port: the server port to connect to :param str username: the username to authenticate as (defaults to the current local username) :param str password: a password to use for authentication or for unlocking a private key :param .PKey pkey: an optional private key to use for authentication :param str key_filename: the filename, or list of filenames, of optional private key(s) to try for authentication :param float timeout: an optional timeout (in seconds) for the TCP connect :param bool allow_agent: set to False to disable connecting to the SSH agent :param bool look_for_keys: set to False to disable searching for discoverable private key files in ``~/.ssh/`` :param bool compress: set to True to turn on compression :param socket sock: an open socket or socket-like object (such as a `.Channel`) to use for communication to the target host :raises BadHostKeyException: if the server's host key could not be verified :raises AuthenticationException: if authentication failed :raises SSHException: if there was any other error connecting or establishing an SSH session :raises socket.error: if a socket error occurred while connecting |
Execute a command on the SSH server. A new `.Channel` is opened and the requested command is executed. The command's input and output streams are returned as Python ``file``-like objects representing stdin, stdout, and stderr. :param str command: the command to execute :param int bufsize: interpreted the same way as by the built-in ``file()`` function in Python :param int timeout: set command's channel timeout. See `Channel.settimeout`.settimeout :return: the stdin, stdout, and stderr of the executing command, as a 3-tuple :raises SSHException: if the server fails to execute the command |
Start an interactive shell session on the SSH server. A new `.Channel` is opened and connected to a pseudo-terminal using the requested terminal type and size. :param str term: the terminal type to emulate (for example, ``"vt100"``) :param int width: the width (in characters) of the terminal window :param int height: the height (in characters) of the terminal window :param int width_pixels: the width (in pixels) of the terminal window :param int height_pixels: the height (in pixels) of the terminal window :return: a new `.Channel` connected to the remote shell :raises SSHException: if the server fails to invoke a shell |
Open an SFTP session on the SSH server. :return: a new `.SFTPClient` session object |
Return the underlying `.Transport` object for this SSH connection. This can be used to perform lower-level tasks, like opening specific kinds of channels. :return: the `.Transport` for this connection |
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