PHP SSH

(develop)

Provides an object-oriented wrapper for the php ssh2 extension. This is based on the work of Antoine Hérault.

Requirements

You need PHP version 7.1+ with the SSH2 extension.

Installation

The best way to add the library to your project is using composer.

$ composer require luka/php-ssh:^2.0

Usage

Configuration of the connection

To establish an SSH connection, you must first define its configuration. For that, create a Configuration instance with all the needed parameters.

<?php

// simple configuration to connect "my-host"
$configuration = new Ssh\HostConfiguration('my-host');

The available configuration classes are:

• Ssh\HostConfiguration
• Ssh\OpenSSH\ConfigFile

Both connection configuration and public/private key authentication can be obtained from a ssh config file such as ~/.ssh/config

<?php

// simple configuration to connect "my-host"
$configuration = Ssh\OpenSSH\ConfigFile::fromHostname('my-host', '~/.ssh/config');
$authentication = $configuration->createAuthenticationMethod('optional_passphrase', 'optional_username');

Create a session

The session is the central access point to the SSH functionality provided by the library.

<?php
// ... the configuration creation
$session = new Ssh\Session($configuration);

Authentication

The authentication classes allow you to authenticate over a SSH session. When you define an authentication for a session, it will authenticate on connection.

<?php

$configuration = new Ssh\HostConfiguration('myhost');
$authentication = new Ssh\Authentication\Password('John', 's3cr3t');

$session = new Session($configuration, $authentication);

The available authentication are:

• None for username based authentication
• Password for password authentication
• PublicKeyFile to authenticate using a public key
• HostBasedFile to authenticate using a public hostkey
• Agent to authenticate using an ssh-agent

Authentication from Ssh\OpenSSH\ConfigFile

If you use an ssh config file you can load your authentication and configuration from it as follows:

<?php

$configuration = Ssh\OpenSSH\ConfigFile::fromHostname('my-host');
$session = new Ssh\Session($configuration, $configuration->createAuthenticationMethod());

This will pick up the username, and your public and private keys from your config file Host and Identity declarations.

This simple snippet only works if the User declaration is also present, and the private key does not require a pass phrase. If any of this is not the case you have to pass the missing values to the createAuthentication() method.

Subsystems

Once you are authenticated over a SSH session, you can use the subsystems.

Sftp

You can easily access the sftp subsystem of a session using the getSftp() method:

<?php

// the session creation
$sftp = $session->getSftp();

See the Ssh\Sftp class for more details on the available methods.

Publickey

The session also provides the getPublickey() method to access the publickey subsystem:

<?php

// ... the session creation
$publickey = $session->getPublickey();

The Public-Key subsystem allows you to provide multiple public keys to use for authentication. See the Ssh\Publickey class for more details on the available methods.

Exec

The session provides the getExec() method to access the exec subsystem

<?php

// ... the session creation

/** @var Ssh\Session $session */
$exec = $session->getExec();
echo $exec->run('ls -lah')->getExitCode(), PHP_EOL;

See the Ssh\Exec class for more details.