Perl

Start SSH Tunnel Keyboard-Interactive Authentication

Demonstrates the Chilkat SshTunnel.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: the server sends one or more questions — a password, a one-time code, a security question — and the client answers each. This is how a tunnel supports two-factor and other challenge-response schemes. The returned XML says exactly what to ask and whether to mask the input.

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Perl

use chilkat();

$success = 0;

#  Demonstrates the SshTunnel.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.

$tunnel = chilkat::CkSshTunnel->new();

#  The tunnel forwards accepted local connections to this destination through the SSH server.
$tunnel->put_DestHostname("db.internal.example.com");
$tunnel->put_DestPort(5432);

#  Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
#  does not authenticate yet.
$sshPort = 22;
$success = $tunnel->Connect("ssh.example.com",$sshPort);
if ($success == 0) {
    print $tunnel->lastErrorText() . "\r\n";
    exit;
}

#  Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
$infoRequestXml = $tunnel->startKeyboardAuth("mySshLogin");
if ($tunnel->get_LastMethodSuccess() == 0) {
    print $tunnel->lastErrorText() . "\r\n";
    exit;
}

print $infoRequestXml . "\r\n";

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

$waitForThreadExit = 1;
$success = $tunnel->CloseTunnel($waitForThreadExit);
if ($success == 0) {
    print $tunnel->lastErrorText() . "\r\n";
    exit;
}