Use SSH in PHP with phpseclib

This guide explains how to work without the module PECL SSH2 client not available on Web hosting and Cloud Servers Infomaniak, using the library instead phpseclib, which works in native PHP without requiring specific extension.

Preamble

• The use of PECL SSH2 client leads to type errors No compatible key exchange algorithms found or Unable to exchange encryption keys in its latest version available.
• Phpseclib allows:
  • SSH authentication by password or private key.
  • The execution of remote commands.
  • Secure file transfer (SFTP).
  • Management of SSH keys.

Use phpseclib

To integrate a SSH connection into a PHP script, use phpseclib as follows:

use phpseclib3\Net\SSH2;
use phpseclib3\Crypt\PublicKeyLoader;

$ssh = new SSH2('domain.xyz');
$key = PublicKeyLoader::load(file_get_contents('/path/to/private_key'));

if (!$ssh->login('utilisateur', $key)) {
    exit('Authentication Failed');
}

echo $ssh->exec('ls -la');