Super fast SSH2 protocol library.
ssh2-python provides Python bindings for libssh2.
Binary wheel packages are provided for Linux, OSX and Windows, all Python versions, with
libssh2 and its required libraries included.
Wheel packages have no dependencies.
pip may need to be updated to be able to install binary wheel packages -
pip install -U pip.
pip install ssh2-python
System packages are also available on the latest release page built on Centos/RedHat 6/7, Ubuntu 14.04/16.04, Debian 7/8 and Fedora 22/23/24.
System packages have no dependencies other than the
libssh2 system library.
API Feature Set
Currently the vast majority of the libssh2 API has been implemented with only few exceptions.
Complete example scripts for various operations can be found in the examples directory.
In addition, as
ssh2-python is a thin wrapper of
libssh2 with Python semantics, its code examples can be ported straight over to Python with only minimal changes.
The library uses Cython based native code extensions as wrappers to
- Thread safe - GIL is released as much as possible
- Very low overhead
- Super fast as a consequence of the excellent C library it uses and prodigious use of native code
- Object oriented - memory freed automatically and safely as objects are garbage collected by Python
- Use Python semantics where applicable, such as context manager and iterator support for opening and reading from SFTP file handles
- Expose errors as Python exceptions where possible
- Provide access to
libssh2error code definitions
Both byte and unicode strings are accepted as arguments and encoded appropriately. To change default encoding,
utf-8, change the value of
ssh2.utils.ENCODING. Channel output is always byte strings.
See Complete Example for a complete example including socket connect.
Please use either the issue tracker for reporting issues with code or the mail group for discussion and questions.
Contributions are most welcome!
Connect and get available authentication methods.
from __future__ import print_function from ssh2.session import Session sock = <create and connect socket> session = Session() session.handshake(sock) print(session.userauth_list())
['publickey', 'password', 'keyboard-interactive']
channel = session.open_session() channel.execute('echo Hello')
size, data = channel.read() while(size > 0): print(data) size, data = channel.read()
print("Exit status: %s" % (channel.get_exit_status()))
Exit status: 0
Public Key Authentication
session.userauth_publickey_fromfile( username, 'my_pkey.pub', 'my_pkey', '')
'' can be a passphrase.
session.userauth_password( username, '<my password>')
sftp = session.sftp_init() with sftp.open(<remote file to read>, 0, 0) as remote_fh, \ open(<file to write>, 'wb') as local_fh: for size, data in remote_fh: local_fh.write(data)
A simple usage example looks very similar to
libssh2 usage examples.
See examples directory for more complete example scripts.
ssh2-python is intentially a thin wrapper over
libssh2 and directly maps most of its API.
Clients using this library can be much simpler to use than interfacing with the
libssh2 API directly.
from __future__ import print_function import os import socket from ssh2.session import Session host = 'localhost' user = os.getlogin() sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect((host, 22)) session = Session() session.handshake(sock) session.agent_auth(user) channel = session.open_session() channel.execute('echo me; exit 2') size, data = channel.read() while size > 0: print(data) size, data = channel.read() channel.close() print("Exit status: %s" % channel.get_exit_status())
Exit status: 2
SSH Functionality currently implemented
- SSH channel operations (exec,shell,subsystem) and methods
- SSH agent functionality
- Public key authentication and management
- SFTP operations
- SFTP file handles and attributes
- SSH port forwarding and tunnelling
- Non-blocking mode
- SCP send and receive
- Listener for port forwarding
- Subsystem support
And more, as per libssh2 functionality.
Comparison with other Python SSH libraries
Performance of above example, compared with Paramiko.
time python examples/example_echo.py time python examples/paramiko_comparison.py
real 0m0.141s user 0m0.037s sys 0m0.008s
real 0m0.592s user 0m0.351s sys 0m0.021s