C++

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.

Chilkat C++ Downloads

Download Chilkat for C++

C++

#include <CkSshTunnel.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  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.

    CkSshTunnel tunnel;

    //  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.
    int sshPort = 22;
    success = tunnel.Connect("ssh.example.com",sshPort);
    if (success == false) {
        std::cout << tunnel.lastErrorText() << "\r\n";
        return;
    }

    //  Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
    const char *infoRequestXml = tunnel.startKeyboardAuth("mySshLogin");
    if (tunnel.get_LastMethodSuccess() == false) {
        std::cout << tunnel.lastErrorText() << "\r\n";
        return;
    }

    std::cout << infoRequestXml << "\r\n";

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

    bool waitForThreadExit = true;
    success = tunnel.CloseTunnel(waitForThreadExit);
    if (success == false) {
        std::cout << tunnel.lastErrorText() << "\r\n";
        return;
    }
    }