VBScript

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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VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

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.

set mailman = CreateObject("Chilkat.MailMan")

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

'  Establish the TLS connection.
success = mailman.SmtpConnect()
If (success = 0) Then
    outFile.WriteLine(mailman.LastErrorText)
    WScript.Quit
End If

'  Get the certificate the SMTP server presented (useSmtp = 1).
set cert = CreateObject("Chilkat.Cert")
success = mailman.GetServerCert(1,cert)
If (success = 0) Then
    outFile.WriteLine(mailman.LastErrorText)
    WScript.Quit
End If

outFile.WriteLine("Server certificate subject (CN): " & cert.SubjectCN)
outFile.WriteLine("Issued by: " & cert.IssuerCN)

success = mailman.CloseSmtpConnection()
If (success = 0) Then
    outFile.WriteLine(mailman.LastErrorText)
    WScript.Quit
End If


outFile.Close