PowerBuilder

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.

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integer li_rc
integer li_Success
oleobject loo_Mailman
oleobject loo_Cert

li_Success = 0

//  Demonstrates the MailMan.GetServerCert method, which gets the digital certificate
//  presented by the SMTP or POP3 server for the current SSL/TLS connection.  Pass 1 for
//  the SMTP server's certificate, or 0 for the POP3 server's certificate.

loo_Mailman = create oleobject
li_rc = loo_Mailman.ConnectToNewObject("Chilkat.MailMan")
if li_rc < 0 then
    destroy loo_Mailman
    MessageBox("Error","Connecting to COM object failed")
    return
end if

//  Configure the SMTP server connection.
loo_Mailman.SmtpHost = "smtp.example.com"
loo_Mailman.SmtpPort = 465
loo_Mailman.SmtpSsl = 1
loo_Mailman.SmtpUsername = "user@example.com"
loo_Mailman.SmtpPassword = "myPassword"

//  Establish the TLS connection.
li_Success = loo_Mailman.SmtpConnect()
if li_Success = 0 then
    Write-Debug loo_Mailman.LastErrorText
    destroy loo_Mailman
    return
end if

//  Get the certificate the SMTP server presented (useSmtp = 1).
loo_Cert = create oleobject
li_rc = loo_Cert.ConnectToNewObject("Chilkat.Cert")

li_Success = loo_Mailman.GetServerCert(1,loo_Cert)
if li_Success = 0 then
    Write-Debug loo_Mailman.LastErrorText
    destroy loo_Mailman
    destroy loo_Cert
    return
end if

Write-Debug "Server certificate subject (CN): " + loo_Cert.SubjectCN
Write-Debug "Issued by: " + loo_Cert.IssuerCN

li_Success = loo_Mailman.CloseSmtpConnection()
if li_Success = 0 then
    Write-Debug loo_Mailman.LastErrorText
    destroy loo_Mailman
    destroy loo_Cert
    return
end if



destroy loo_Mailman
destroy loo_Cert