Perl

Start SFTP Keyboard-Interactive Authentication

Demonstrates the Chilkat SFtp.StartKeyboardAuth method, which begins keyboard-interactive authentication. The only argument is the login name. It returns XML describing the server's prompts, which are answered with ContinueKeyboardAuth.

Background: Keyboard-interactive is the prompt-driven authentication method: rather than assuming a single password, the server sends one or more questions — a password, a one-time code, a security question — and the client answers each. This is how SFTP supports two-factor and other challenge-response schemes. The returned XML tells you exactly what to ask and whether to mask the input.

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use strict;
use warnings;
use Chilkat2;

# Demonstrates the SFtp.StartKeyboardAuth method, which begins keyboard-interactive
# authentication.  The only argument is the login name.  It returns XML describing the server's
# prompts, which are answered with ContinueKeyboardAuth.

my $sftp = Chilkat2::SFtp->new;

# Step 1: Connect the SSH transport.  Port 22 is the usual port.
my $port = 22;
my $success = $sftp->Connect('sftp.example.com', $port);
if (!$success) {
    print $sftp->LastErrorText, "\n";
    exit;
}

# Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
my $infoRequestXml = $sftp->StartKeyboardAuth('mySshLogin');
if (!$sftp->LastMethodSuccess) {
    print $sftp->LastErrorText, "\n";
    exit;
}

print $infoRequestXml, "\n";

# Answer the prompt(s) with ContinueKeyboardAuth, then call InitializeSftp.

$sftp->Disconnect();