PHP

Get the SSH Server's Authentication Methods

Demonstrates the Chilkat Ssh.GetAuthMethods method, which queries a connected but unauthenticated SSH server for the authentication methods it advertises. It takes no arguments and returns a lowercase, comma-separated list such as publickey,password,keyboard-interactive. Call it after Connect and before authenticating.

Background: Knowing what the server accepts lets a client choose the right authentication path — for example, falling back to keyboard-interactive when password auth is not offered. Note the documented connection side effect: querying methods advances the SSH authentication state, so call it at the correct point in the sequence.

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<?php

use Chilkat2\Ssh;

// Demonstrates the Ssh.GetAuthMethods method, which queries a connected but unauthenticated SSH
// server for the authentication methods it advertises.  It takes no arguments and returns a
// lowercase, comma-separated list such as "publickey,password,keyboard-interactive".

$ssh = new Ssh();

// Connect to the SSH server.  Port 22 is the usual SSH port.
$sshPort = 22;
try {
    $ssh->Connect('ssh.example.com', $sshPort);

    // Query the advertised authentication methods.  Call after Connect, before authenticating.
    $methods = $ssh->GetAuthMethods();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo 'Server auth methods: ', $methods, "\n";

$ssh->Disconnect();