Continue SFTP Keyboard-Interactive Authentication

See more SFTP Examples

Demonstrates the Chilkat SFtp.ContinueKeyboardAuth method, which submits a response to a keyboard-interactive prompt. The only argument is the response text; for a request with multiple prompts, an XML response is supplied instead. It returns XML indicating the next prompt or the final result.

Background: This is the second half of the exchange started by StartKeyboardAuth. A server may issue several rounds of prompts, so a robust client loops: submit answers, read the returned XML, and continue until it sees success or failure. On success, remember that InitializeSftp still must be called before any file operation.

Chilkat C# Downloads

Download Chilkat for C#

bool success = false;

//  Demonstrates the SFtp.ContinueKeyboardAuth method, which submits a response to a
//  keyboard-interactive prompt.  The only argument is the response.  For multiple prompts, an
//  XML response is supplied instead.

Chilkat.SFtp sftp = new Chilkat.SFtp();

//  Step 1: Connect the SSH transport.  Port 22 is the usual port.
int port = 22;
success = sftp.Connect("sftp.example.com",port);
if (success == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

//  Begin keyboard-interactive authentication to receive the server's prompt(s).
string infoRequestXml = sftp.StartKeyboardAuth("mySshLogin");
if (sftp.LastMethodSuccess == false) {
    Debug.WriteLine(sftp.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.
string password = "mySshPassword";

//  Submit the response (typically the password).  The returned XML indicates the next prompt or
//  the final result.
string result = sftp.ContinueKeyboardAuth(password);
if (sftp.LastMethodSuccess == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

Debug.WriteLine(result);

//  On success, initialize the SFTP subsystem.
success = sftp.InitializeSftp();
if (success == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

sftp.Disconnect();