(Objective-C) HTTP - Verify Server is a Trusted Root CA

Demonstrates how to only allow connections to an HTTP server having a certificate with a root that is in our list of trusted CA root certificates.

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#import <CkoGlobal.h>
#import <NSString.h>
#import <CkoHttp.h>
#import <CkoTrustedRoots.h>

// Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
// by calling UnlockBundle.  It requires a Bundle unlock code.
CkoGlobal *chilkatGlob = [[CkoGlobal alloc] init];
BOOL success = [chilkatGlob UnlockBundle: @"Anything for 30-day trial."];
if (success != YES) {
    NSLog(@"%@",chilkatGlob.LastErrorText);
    return;
}

//  On my particular system, the root CA cert for this URL is not pre-installed.
//  Note: This may be different for you.
//  Also, this example was written on 29-May-2015.  This URL was valid at the time,
//  but may not be valid at a future date.
NSString *url = @"https://animals.nationalgeographic.com/animals/invertebrates/starfish/";

CkoHttp *http = [[CkoHttp alloc] init];

//  Require that the SSL/TLS server certificate is not expired,
//  and that the certificate signature is valid.
//  This does not ensure that it has a chain of authentication to
//  a trusted root.  To ensure that, the TrustedRoots object (below) is required.
http.RequireSslCertVerify = YES;

//  Do the HTTPS page fetch (through the SSH tunnel)
NSString *html = [http QuickGetStr: url];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

NSLog(@"%@",@"The HTTP GET was successful.");

//  Now let's require that HTTP requests to SSL/TLS servers that don't have trusted CA roots
//  should fail.
CkoTrustedRoots *trustedRoots = [[CkoTrustedRoots alloc] init];

//  Indicate that we will trust any pre-installed certificates on this system.
//  (The meaning of pre-installed certificates depends on the operating system, and in
//  some environments there is no such thing as pre-installed certificates.  See the reference
//  documentation for the TrustedRoots class.)
trustedRoots.TrustSystemCaRoots = YES;

//  Activate the trusted roots globally for all Chilkat objects.
//  This call really shouldn't fail, so we're not checking the return value.
success = [trustedRoots Activate];

//  Given that our previous HTTP GET likely kept the connection open,
//  make sure that all HTTP connections are closed before re-trying.
//  Otherwise, we'll simply be re-using the pre-existing connection.
success = [http CloseAllConnections];

//  Now let's try fetching the URL again.  It should fail this time because
//  there is a requirement that the SSL/TLS server certificate must have a trusted root,
//  and the trusted root for this URL is not installed on my system (but may be different for you..)
html = [http QuickGetStr: url];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    NSLog(@"%@",@"Good, the HTTP request failed as expected.");
}
else {
    NSLog(@"%@",http.LastErrorText);
    NSLog(@"%@",@"Hmmm... we did not fail as expected?");
}