Objective-C

FTP Connect, Examine Server Certificate, and then Authenticate

See more FTP Examples

Demonstrates how to connect to an FTP server, examine the server's SSL/TLS certificate, and then, if it meets the application's security requirements, proceed to authenticate. Objective-C

#import <CkoFtp2.h>
#import <CkoCert.h>

BOOL success = NO;

//  This example assumes Chilkat Ftp2 to have been previously unlocked.
//  See Unlock Ftp2 for sample code.

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

ftp.Hostname = @"www.authtls-ftps-server.com";
ftp.Username = @"FTP_LOGIN";
ftp.Password = @"FTP_PASSWORD";
ftp.AuthTls = YES;
ftp.Port = [NSNumber numberWithInt:21];

//  Connect to the FTP server using explicit TLS (AUTH TLS).
success = [ftp ConnectOnly];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

//  Get the FTP server's certificate.
CkoCert *serverCert = [[CkoCert alloc] init];
success = [ftp GetServerCert: serverCert];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

//  Now that we have the certificate, we can check it in any way we desire.
//  (See the online reference documentation for the certificate object's methods
//  and properties)...

//  Assuming the certificate is OK, proceed to authenticate with the FTP server.
success = [ftp LoginAfterConnectOnly];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

//  Proceed with uploading/download files, etc...
//  

[ftp Disconnect];
NSLog(@"%@",@"Success.");