Objective-C

SFTP Authenticate with Password and Private Key

Demonstrates the Chilkat SFtp.AuthenticatePwPk method, which authenticates with a server that requires both a password and a private key. The arguments are the username, the password, and an SshKey private key.

Note: The private-key path is relative to the application's current working directory. Supply the path to your own key file.

Background: Most servers require either a password or a public key, not both — but some high-security deployments mandate two-factor SSH, combining something you know (the password) with something you have (the key). This method satisfies that policy in one call. As always, the password should come from a secure source rather than a literal in code.

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Objective-C

#import <CkoSFtp.h>
#import <NSString.h>
#import <CkoSshKey.h>

BOOL success = NO;

//  Demonstrates the SFtp.AuthenticatePwPk method, which authenticates with a server that requires
//  BOTH a password and a private key.  The 1st argument is the username, the 2nd is the password,
//  and the 3rd is an SshKey private key.

CkoSFtp *sftp = [[CkoSFtp alloc] init];

//  Step 1: Connect the SSH transport.  Port 22 is the usual port.
int port = 22;
success = [sftp Connect: @"sftp.example.com" port: [NSNumber numberWithInt: port]];
if (success == NO) {
    NSLog(@"%@",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.
NSString *password = @"mySshPassword";

//  Load the SSH private key.  LoadText reads the file's text, which is then imported.
CkoSshKey *privKey = [[CkoSshKey alloc] init];
NSString *keyText = [privKey LoadText: @"qa_data/id_rsa"];
if (privKey.LastMethodSuccess == NO) {
    NSLog(@"%@",privKey.LastErrorText);
    return;
}

success = [privKey FromOpenSshPrivateKey: keyText];
if (success == NO) {
    NSLog(@"%@",privKey.LastErrorText);
    return;
}

success = [sftp AuthenticatePwPk: @"mySshLogin" password: password privateKey: privKey];
if (success == NO) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

//  Step 3: Open the SFTP subsystem.  This must be done after authentication and before any
//  file or directory operations.
success = [sftp InitializeSftp];
if (success == NO) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

NSLog(@"%@",@"Authenticated with a password and a private key.");

[sftp Disconnect];