SSH Tunnel Authenticate with a SecureString Password and Private Key

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Demonstrates the Chilkat SshTunnel.AuthenticateSecPwPk method, which authenticates using SecureString login and password objects together with a private key. The third argument is the 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.

func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the SshTunnel.AuthenticateSecPwPk method, which authenticates using SecureString
    //  login and password objects together with a private key.  The 1st argument is the username, the
    //  2nd is the password, and the 3rd is an SshKey private key.

    let tunnel = CkoSshTunnel()!

    //  The tunnel forwards accepted local connections to this destination through the SSH server.
    tunnel.destHostname = "db.internal.example.com"
    tunnel.destPort = 5432

    //  Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
    //  does not authenticate yet.
    var sshPort: Int = 22
    success = tunnel.connect(hostname: "ssh.example.com", port: sshPort)
    if success == false {
        print("\(tunnel.lastErrorText!)")
        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.
    var password: String? = "mySshPassword"

    //  Load the SSH private key.  LoadText reads the file's text, which is then imported.
    let privKey = CkoSshKey()!
    var keyText: String? = privKey.loadText(path: "qa_data/id_rsa")
    if privKey.lastMethodSuccess == false {
        print("\(privKey.lastErrorText!)")
        return
    }

    success = privKey.fromOpenSshPrivateKey(keyStr: keyText)
    if success == false {
        print("\(privKey.lastErrorText!)")
        return
    }

    //  Place the login and password into SecureString objects.
    let secureLogin = CkoSecureString()!
    secureLogin.append(str: "mySshLogin")
    let securePassword = CkoSecureString()!
    securePassword.append(str: password)

    success = tunnel.authenticateSecPwPk(username: secureLogin, password: securePassword, privateKey: privKey)
    if success == false {
        print("\(tunnel.lastErrorText!)")
        return
    }

    print("Authenticated.")

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

    var waitForThreadExit: Bool = true
    success = tunnel.closeTunnel(waitForThreads: waitForThreadExit)
    if success == false {
        print("\(tunnel.lastErrorText!)")
        return
    }


}