Rust

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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Rust


// 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.

let tunnel = chilkat::SshTunnel::new();

// The tunnel forwards accepted local connections to this destination through the SSH server.
tunnel.set_dest_hostname("db.internal.example.com");
tunnel.set_dest_port(5432);

// Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
// does not authenticate yet.
let ssh_port = 22;
if tunnel.connect("ssh.example.com", ssh_port).is_err() {
    println!("{}", tunnel.last_error_text());
    return;
}

// Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
let Ok(info_request_xml) = tunnel.start_keyboard_auth("mySshLogin") else {
    println!("{}", tunnel.last_error_text());
    return;
};

println!("{}", info_request_xml);

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

let wait_for_thread_exit = true;
if tunnel.close_tunnel(wait_for_thread_exit).is_err() {
    println!("{}", tunnel.last_error_text());
    return;
}