Swift

Get the SMTP or POP3 Server's TLS Certificate

Demonstrates the Chilkat MailMan.GetServerCert method, which gets the digital certificate presented by the SMTP or POP3 server for the current SSL/TLS connection and stores it in a Cert object. Pass true for the SMTP server's certificate or false for the POP3 server's. This example connects to the SMTP server and prints the certificate's subject and issuer.

Background: During a TLS handshake the server presents a certificate proving its identity, and the client validates it against trusted authorities. Retrieving that certificate lets you inspect it yourself — checking the subject, issuer, or expiration for auditing, logging, or certificate-pinning style checks. It must be called while a TLS connection is established, since the certificate belongs to that specific session.

Chilkat Swift Downloads

Download Chilkat for Swift

Swift


func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the MailMan.GetServerCert method, which gets the digital certificate
    //  presented by the SMTP or POP3 server for the current SSL/TLS connection.  Pass true for
    //  the SMTP server's certificate, or false for the POP3 server's certificate.

    let mailman = CkoMailMan()!

    //  Configure the SMTP server connection.
    mailman.smtpHost = "smtp.example.com"
    mailman.smtpPort = 465
    mailman.smtpSsl = true
    mailman.smtpUsername = "user@example.com"
    mailman.smtpPassword = "myPassword"

    //  Establish the TLS connection.
    success = mailman.smtpConnect()
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    //  Get the certificate the SMTP server presented (useSmtp = true).
    let cert = CkoCert()!
    success = mailman.getServerCert(useSmtp: true, cert: cert)
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    print("Server certificate subject (CN): \(cert.subjectCN!)")
    print("Issued by: \(cert.issuerCN!)")

    success = mailman.closeSmtpConnection()
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }


}