Perl

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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Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# 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".

my $ssh = Chilkat2::Ssh->new;

# Connect to the SSH server.  Port 22 is the usual SSH port.
my $sshPort = 22;
my $success = $ssh->Connect('ssh.example.com', $sshPort);
if (!$success) {
    print $ssh->LastErrorText, "\n";
    exit;
}

# Query the advertised authentication methods.  Call after Connect, before authenticating.
my $methods = $ssh->GetAuthMethods();
if (!$ssh->LastMethodSuccess) {
    print $ssh->LastErrorText, "\n";
    exit;
}

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

$ssh->Disconnect();