Objective-C

Set the FTP TLS Version and Ciphers

Demonstrates the TLS negotiation properties SslProtocol and SslAllowedCiphers, and reads back the negotiated TlsVersion and TlsCipherSuite after connecting.

Background: SslProtocol sets the allowed (or minimum) TLS version — default lets Chilkat negotiate the best available, while a value like TLS 1.2 or higher enforces a floor for policy compliance. SslAllowedCiphers narrows the offered cipher suites, which most applications should leave at the secure defaults. The read-only TlsVersion and TlsCipherSuite report what was actually agreed, useful for logging and audits.

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Objective-C

#import <CkoFtp2.h>

BOOL success = NO;

CkoFtp2 *ftp = [[CkoFtp2 alloc] init];

ftp.Hostname = @"ftp.example.com";
ftp.Username = @"myFtpLogin";

ftp.AuthTls = YES;

//  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.
ftp.Password = @"myPassword";

//  Require at least TLS 1.2.  Accepted values include "default", "TLS 1.3", "TLS 1.2",
//  "TLS 1.2 or higher", and so on.  "default" lets Chilkat negotiate the best available.
ftp.SslProtocol = @"TLS 1.2 or higher";

//  Optionally restrict the cipher suites offered.  Leave empty to use Chilkat's secure defaults.
ftp.SslAllowedCiphers = @"TLS_AES_256_GCM_SHA384,TLS_CHACHA20_POLY1305_SHA256";

success = [ftp Connect];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

//  After connecting, read back what was actually negotiated.
NSLog(@"%@%@",@"Negotiated TLS version: ",ftp.TlsVersion);
NSLog(@"%@%@",@"Negotiated cipher suite: ",ftp.TlsCipherSuite);

success = [ftp Disconnect];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}