Objective-C

Open an SSH Tunnel

Demonstrates Socket.SshOpenTunnel, which connects to an SSH server and initializes an SSH tunneling session, then authenticates it.

Background. An SSH tunnel lets a socket reach a destination host through an SSH server using port forwarding. The sequence is: open the tunnel, authenticate, then open forwarded channels to destinations.

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Objective-C

#import <CkoSocket.h>
#import <NSString.h>

BOOL success = NO;

CkoSocket *socket = [[CkoSocket alloc] init];

//  Connect to the SSH server and initialize an SSH tunneling session.  Port 22 is conventional but
//  not required.
success = [socket SshOpenTunnel: @"ssh.example.com" sshPort: [NSNumber numberWithInt: 22]];
if (success == NO) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

//  After the tunnel is open, authenticate before opening forwarded channels.
//  The SSH password should come from a secure source rather than being hard-coded.
NSString *sshPassword = @"mySshPassword";
success = [socket SshAuthenticatePw: @"sshUser" sshPassword: sshPassword];
if (success == NO) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

NSLog(@"%@",@"SSH tunnel established and authenticated.");