Lianja

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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llSuccess = .F.

//  Demonstrates the MailMan.GetServerCert method, which gets the digital certificate
//  presented by the SMTP or POP3 server for the current SSL/TLS connection.  Pass .T. for
//  the SMTP server's certificate, or .F. for the POP3 server's certificate.

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"

//  Establish the TLS connection.
llSuccess = loMailman.SmtpConnect()
if (llSuccess = .F.) then
    ? loMailman.LastErrorText
    release loMailman
    return
endif

//  Get the certificate the SMTP server presented (useSmtp = .T.).
loCert = createobject("CkCert")
llSuccess = loMailman.GetServerCert(.T.,loCert)
if (llSuccess = .F.) then
    ? loMailman.LastErrorText
    release loMailman
    release loCert
    return
endif

? "Server certificate subject (CN): " + loCert.SubjectCN
? "Issued by: " + loCert.IssuerCN

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



release loMailman
release loCert