Start SFTP Keyboard-Interactive Authentication

See more SFTP Examples

Demonstrates the Chilkat SFtp.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: rather than assuming a single password, the server sends one or more questions — a password, a one-time code, a security question — and the client answers each. This is how SFTP supports two-factor and other challenge-response schemes. The returned XML tells you exactly what to ask and whether to mask the input.

Chilkat C# Downloads

Download Chilkat for C#

bool success = false;

//  Demonstrates the SFtp.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.

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.  The returned XML describes the server's prompts.
string infoRequestXml = sftp.StartKeyboardAuth("mySshLogin");
if (sftp.LastMethodSuccess == false) {
    Debug.WriteLine(sftp.LastErrorText);
    return;
}

Debug.WriteLine(infoRequestXml);

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

sftp.Disconnect();