Unicode C

SSH Tunnel Authenticate with Password and Private Key

Demonstrates the Chilkat SshTunnel.AuthenticatePwPk method, which authenticates with a server that requires both a password and a private key. The arguments are the username, the password, and an SshKey private key.

Note: The private-key path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own key file.

Background: Most servers require either a password or a public key, not both — but some high-security deployments mandate two-factor SSH. This method satisfies that policy in one call, combining something you know (the password) with something you have (the key). The password should come from a secure source rather than a literal.

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#include <C_CkSshTunnelW.h>
#include <C_CkSshKeyW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkSshTunnelW tunnel;
    int sshPort;
    const wchar_t *password;
    HCkSshKeyW privKey;
    const wchar_t *keyText;
    BOOL waitForThreadExit;

    success = FALSE;

    //  Demonstrates the SshTunnel.AuthenticatePwPk method, which authenticates with an SSH server that
    //  requires BOTH a password and a private key.  The 1st argument is the username, the 2nd is the
    //  password, and the 3rd is an SshKey private key.

    tunnel = CkSshTunnelW_Create();

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

    //  Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
    //  does not authenticate yet.
    sshPort = 22;
    success = CkSshTunnelW_Connect(tunnel,L"ssh.example.com",sshPort);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel));
        CkSshTunnelW_Dispose(tunnel);
        return;
    }

    //  Normally you would not hard-code the password in source.  You should instead obtain it
    //  from an interactive prompt, environment variable, or a secrets vault.
    password = L"mySshPassword";

    //  Load the SSH private key.  LoadText reads the file's text, which is then imported.
    privKey = CkSshKeyW_Create();
    keyText = CkSshKeyW_loadText(privKey,L"qa_data/id_rsa");
    if (CkSshKeyW_getLastMethodSuccess(privKey) == FALSE) {
        wprintf(L"%s\n",CkSshKeyW_lastErrorText(privKey));
        CkSshTunnelW_Dispose(tunnel);
        CkSshKeyW_Dispose(privKey);
        return;
    }

    success = CkSshKeyW_FromOpenSshPrivateKey(privKey,keyText);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSshKeyW_lastErrorText(privKey));
        CkSshTunnelW_Dispose(tunnel);
        CkSshKeyW_Dispose(privKey);
        return;
    }

    success = CkSshTunnelW_AuthenticatePwPk(tunnel,L"mySshLogin",password,privKey);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel));
        CkSshTunnelW_Dispose(tunnel);
        CkSshKeyW_Dispose(privKey);
        return;
    }

    wprintf(L"Authenticated with a password and a private key.\n");

    //  After authenticating, call BeginAccepting to start listening for local connections to forward.

    waitForThreadExit = TRUE;
    success = CkSshTunnelW_CloseTunnel(tunnel,waitForThreadExit);
    if (success == FALSE) {
        wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel));
        CkSshTunnelW_Dispose(tunnel);
        CkSshKeyW_Dispose(privKey);
        return;
    }



    CkSshTunnelW_Dispose(tunnel);
    CkSshKeyW_Dispose(privKey);

    }