Objective-C

Get the SSH Server's Authentication Methods

Demonstrates the Chilkat Ssh.GetAuthMethods method, which queries a connected but unauthenticated SSH server for the authentication methods it advertises. It takes no arguments and returns a lowercase, comma-separated list such as publickey,password,keyboard-interactive. Call it after Connect and before authenticating.

Background: Knowing what the server accepts lets a client choose the right authentication path — for example, falling back to keyboard-interactive when password auth is not offered. Note the documented connection side effect: querying methods advances the SSH authentication state, so call it at the correct point in the sequence.

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Objective-C

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

BOOL success = NO;

//  Demonstrates the Ssh.GetAuthMethods method, which queries a connected but unauthenticated SSH
//  server for the authentication methods it advertises.  It takes no arguments and returns a
//  lowercase, comma-separated list such as "publickey,password,keyboard-interactive".

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;
}

//  Query the advertised authentication methods.  Call after Connect, before authenticating.
NSString *methods = [ssh GetAuthMethods];
if (ssh.LastMethodSuccess == NO) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

NSLog(@"%@%@",@"Server auth methods: ",methods);

[ssh Disconnect];