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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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llSuccess = .F.

//  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.

loMailman = createobject("CkMailMan")

//  Configure the SMTP server connection.
loMailman.SmtpHost = "smtp.example.com"
loMailman.SmtpPort = 465
loMailman.SmtpSsl = .T.
loMailman.SmtpUsername = "user@example.com"
loMailman.SmtpPassword = "myPassword"

//  Load the client certificate from a PEM file.
llSuccess = loMailman.SetSslClientCertPem("qa_data/certs/client.pem","pem_password")
if (llSuccess = .F.) then
    ? loMailman.LastErrorText
    release loMailman
    return
endif

llSuccess = loMailman.VerifySmtpLogin()
if (llSuccess = .F.) then
    ? loMailman.LastErrorText
    release loMailman
    return
endif

? "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.


release loMailman