Ansible Pylibssh

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1.4.0 verified Wed Apr 15 auth: no python

Ansible Pylibssh provides Python bindings for the `libssh` client library, specifically designed for Ansible's SSH connection needs. It offers a low-level interface to SSH functionalities. The library is actively maintained with regular stable releases, with the current version being 1.4.0, which was released in March 2026.

pip install ansible-pylibssh
error [WARNING]: ansible-pylibssh not installed, falling back to paramiko
cause Ansible defaults to using the 'paramiko' SSH library because 'ansible-pylibssh' is not installed.
fix
Install 'ansible-pylibssh' using pip: 'pip install ansible-pylibssh'.
error fatal: [10.96.192.10]: FAILED! => {"changed": false, "msg": "paramiko: The authenticity of host '10.96.192.10' can't be established.\nThe ssh-ed25519 key fingerprint is b'REDACTED'."}
cause The SSH client cannot verify the host's identity because the host key is not in the known_hosts file.
fix
Manually add the host key to the known_hosts file or configure Ansible to accept unknown host keys.
error ld: library not found for -lssh
cause The linker cannot find the 'libssh' library during the installation of 'ansible-pylibssh'.
fix
Ensure 'libssh' is installed on your system. On macOS, you can install it using Homebrew: 'brew install libssh'.
error fatal: [10.2.201.194]: FAILED! => {"changed": false, "msg": "paramiko is not installed: No module named 'paramiko'"}
cause Ansible falls back to 'paramiko' for SSH connections, but 'paramiko' is not installed.
fix
Install 'paramiko' using pip: 'pip install paramiko'.
error fatal error: 'libssh/libssh.h' file not found
cause ansible-pylibssh requires the `libssh` client library and its development headers (version 0.9.0 or newer) to be present and discoverable by the compiler during installation, which can be challenging on macOS or when building from source without proper CFLAGS.
fix
Install libssh using your system's package manager (e.g., brew install libssh on macOS, sudo apt-get install libssh-dev on Debian/Ubuntu, sudo dnf install libssh-devel on RHEL/Fedora) and then install ansible-pylibssh using pip with appropriate CFLAGS if necessary, especially on macOS. For macOS with Homebrew, use: CFLAGS="-I $(brew --prefix)/include -I ext -L $(brew --prefix)/lib -lssh" pip install ansible-pylibssh
gotcha The library is a set of Python bindings for `libssh`. Therefore, `libssh` (version 0.9.0 or newer) must be installed at the system level for `ansible-pylibssh` to function. Installing the Python package via pip alone is insufficient.
fix Install `libssh` development packages (e.g., `libssh-dev` on Debian/Ubuntu, `libssh-devel` on RHEL/Fedora, or via Homebrew on macOS) matching version 0.9.0 or later on your operating system.
breaking Support for Python 3.6, 3.7, and 3.8 was dropped with version 1.4.0. Installations on these Python versions will fail or result in an incompatible state.
fix Upgrade your Python environment to Python 3.9 or newer before installing `ansible-pylibssh` version 1.4.0 or later.
gotcha Older versions (prior to v1.2.2) had a bug where downloading files larger than 64kB over SCP could fail, leading to incomplete transfers.
fix Upgrade `ansible-pylibssh` to version 1.2.2 or newer to ensure reliable SCP transfers for larger files.
gotcha Prior to version 1.2.1, attempting to download a non-existent remote file via SCP could lead to program crashes.
fix Upgrade `ansible-pylibssh` to version 1.2.1 or newer to prevent crashes when handling non-existent remote files during SCP operations.
gotcha Earlier versions (prior to v1.2.0) could crash if `channel.recv` was called and `libssh` returned an `SSH_EOF` error, or if a channel was not explicitly closed.
fix Upgrade `ansible-pylibssh` to version 1.2.0 or newer for improved stability and crash prevention related to channel handling.
breaking As of version 1.4.0, macOS wheels require macOS version 15.0 or newer due to updates in the `cibuildwheel` process. Installations on older macOS versions may encounter issues.
fix Ensure your macOS environment is version 15.0 or newer when installing `ansible-pylibssh` 1.4.0+ to use pre-compiled wheels. Alternatively, attempt to build from source (which may require specific build tools and `libssh` installation).

This quickstart demonstrates how to establish an SSH session, execute a simple command, and then properly disconnect. It uses environment variables for host, user, and password for security and flexibility. Ensure the `libssh` C library is installed on your system and replace `SSH_HOST` and `SSH_USER` with valid credentials if not using a passwordless setup.

import os
from pylibsshext.errors import LibsshSessionException
from pylibsshext.session import Session

HOST = os.environ.get('SSH_HOST', 'localhost')
USER = os.environ.get('SSH_USER', 'testuser')
PASSWORD = os.environ.get('SSH_PASSWORD', '')
# Use a placeholder if not set, but real connections need a password or key

if not PASSWORD:
    print("Warning: SSH_PASSWORD environment variable not set. Connection might fail if password authentication is required.")

TIMEOUT = 30
PORT = 22

ssh = Session()
try:
    ssh.connect(
        host=HOST,
        user=USER,
        password=PASSWORD,
        timeout=TIMEOUT,
        port=PORT,
    )
    print(f'Successfully connected to {HOST}:{PORT}.')
    # Example: Execute a command
    channel = ssh.open_session()
    channel.request_exec('echo Hello from pylibssh!')
    output = channel.read_stdout(2048).decode()
    print(f'Command output: {output.strip()}')
    channel.close()
    channel.send_eof()

except LibsshSessionException as ssh_exc:
    print(f'Failed to connect to {HOST}:{PORT} over SSH: {ssh_exc!s}')
except Exception as e:
    print(f'An unexpected error occurred: {e}')
finally:
    if ssh.is_connected:
        ssh.disconnect()
        print(f'Disconnected from {HOST}.')