Objective-C

Use a PEM TLS Client Certificate

Demonstrates the Chilkat MailMan.SetSslClientCertPem method, which sets the client-side certificate for SSL/TLS connections, loading it from PEM data or from a PEM file. The first argument may contain the PEM text itself or a path to a PEM file; the second is the PEM password. This example loads the client certificate from a PEM file.

Background: PEM is the familiar Base64 text format bracketed by -----BEGIN CERTIFICATE----- lines, and a single PEM can hold both a certificate and its (optionally encrypted) private key. It is the common format in Unix/OpenSSL environments, whereas PFX is more typical on Windows. Because this method accepts either the PEM text or a filename, you can supply credentials straight from a config value or secret store without writing them to disk.

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Objective-C

#import <CkoMailMan.h>

BOOL success = NO;

//  Demonstrates the MailMan.SetSslClientCertPem method, which sets the client-side
//  certificate for SSL/TLS connections, loading it from PEM data or from a PEM file.  The
//  1st argument may contain PEM text or a PEM file path; the 2nd is the PEM password.

CkoMailMan *mailman = [[CkoMailMan alloc] init];

//  Configure the SMTP server connection.
mailman.SmtpHost = @"smtp.example.com";
mailman.SmtpPort = [NSNumber numberWithInt:465];
mailman.SmtpSsl = YES;
mailman.SmtpUsername = @"user@example.com";
mailman.SmtpPassword = @"myPassword";

//  Load the client certificate from a PEM file.
success = [mailman SetSslClientCertPem: @"qa_data/certs/client.pem" pemPassword: @"pem_password"];
if (success == NO) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

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

NSLog(@"%@",@"Connected using a PEM TLS client certificate.");

//  Note: The path "qa_data/certs/client.pem" is a relative local filesystem path,
//  relative to the current working directory of the running application.