Advertise Acceptable Client CA Names for Mutual TLS

See more Socket/SSL/TLS Examples

Demonstrates Socket.AddSslAcceptableClientCaDn, which adds a certificate-authority distinguished name to the list a TLS server advertises when requesting a client certificate for mutual TLS.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

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

BOOL success = NO;

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

//  For mutual TLS, advertise the acceptable client-certificate CA distinguished names BEFORE
//  initializing server-side TLS.  Call once for each acceptable CA distinguished name.
success = [socket AddSslAcceptableClientCaDn: @"CN=Example Root CA, O=Example, C=US"];
if (success == NO) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

success = [socket AddSslAcceptableClientCaDn: @"CN=Example Intermediate CA, O=Example, C=US"];
if (success == NO) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

//  The file path is relative to the application's current working directory.  An absolute path
//  may also be used.  Supply the path appropriate to your own environment.
//  The PFX password should come from a secure source rather than being hard-coded.
NSString *pfxPassword = @"myPfxPassword";
CkoCert *cert = [[CkoCert alloc] init];
success = [cert LoadPfxFile: @"qa_data/server.pfx" password: pfxPassword];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

//  Initialize server-side TLS.  The server will now request a client certificate and advertise the
//  acceptable CA distinguished names added above.
success = [socket InitSslServer: cert];
if (success == NO) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

NSLog(@"%@",@"Server-side TLS configured to request client certificates.");