Objective-C

Continue SSH Keyboard-Interactive Authentication

Demonstrates the Chilkat Ssh.ContinueKeyboardAuth method, which submits a response to a keyboard-interactive prompt. The only argument is the response text; for a request containing 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 keyboard-interactive 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 authentication succeeds or fails. Prompt responses are typically secrets, so obtain them from interactive input rather than embedding them in code.

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Objective-C

#import <CkoSsh.h>
#import <NSString.h>

BOOL success = NO;

//  Demonstrates the Ssh.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.

CkoSsh *ssh = [[CkoSsh alloc] init];

//  Connect to the SSH server.  Port 22 is the usual SSH port.
int sshPort = 22;
success = [ssh Connect: @"ssh.example.com" port: [NSNumber numberWithInt: sshPort]];
if (success == NO) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

//  Begin keyboard-interactive authentication to receive the server's prompt(s).
NSString *infoRequestXml = [ssh StartKeyboardAuth: @"mySshLogin"];
if (ssh.LastMethodSuccess == NO) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

//  Normally you would not hard-code the response (typically the password) in source.  You
//  should instead obtain it from an interactive prompt.
NSString *response = @"mySshPassword";

//  Submit the response.  The returned XML indicates the next prompt or the final result.
NSString *result = [ssh ContinueKeyboardAuth: response];
if (ssh.LastMethodSuccess == NO) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

NSLog(@"%@",result);

[ssh Disconnect];