Paramiko

Paramiko is an open-source Python library that provides an implementation of the SSH2 protocol. It enables secure remote login and file transfers over Secure Shell (SSH) connections and is commonly used in automation and orchestration scripts. Paramiko offers both high-level client interfaces and lower-level building blocks for handling SSH communications.

Key components include SSHClient, which manages connections and authentication; Transport, which handles the underlying SSH transport layer; Channel for sending and receiving data; and SFTPClient for file transfer via the SFTP subsystem. It supports password-based and public-key authentication, as well as known_hosts verification and SSH agent integration for private keys.

Paramiko also provides a basic framework for implementing an SSH server. While not a full-featured production SSH server, it includes a server interface and example code that allow developers to implement authentication, channel requests, and command execution for a custom server.

Implementation and licensing: Paramiko is written in Python, with cryptographic operations relying on external libraries such as cryptography. It is distributed under a BSD-style license and is hosted on platforms such as PyPI and GitHub. It is designed to be compatible with Python 3 and is widely used in automation tasks that require secure remote execution or file transfers.