Visual FoxPro

Set a TLS Client Certificate for IMAP

Demonstrates the Chilkat Imap.SetSslClientCert method, which supplies a client certificate for TLS client-certificate authentication. The only argument is a Cert object that must provide access to its private key. Call it before connecting. This example loads the certificate from a PFX file.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: Most IMAP servers authenticate with a username and password only. A few high-security deployments additionally require mutual TLS, where the client presents its own certificate during the handshake. Because that happens as part of connecting, the certificate must be set before Connect — setting it afterward has no effect on the already-established connection.

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LOCAL lnSuccess
LOCAL loImap
LOCAL lcPfxPassword
LOCAL loCert

lnSuccess = 0

*  Demonstrates the Imap.SetSslClientCert method, which supplies a client certificate for TLS
*  client-certificate authentication.  The only argument is a Cert object.  It must be called
*  before connecting.

loImap = CreateObject('Chilkat.Imap')

loImap.Ssl = 1
loImap.Port = 993

*  The PFX password is not hard-coded in source.  Insert code here to obtain it from an
*  interactive prompt, environment variable, or a secrets vault.

*  Load the client certificate (and its private key) from a PFX file.
loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCert.LoadPfxFile("qa_data/client.pfx",lcPfxPassword)
IF (lnSuccess = 0) THEN
    ? loCert.LastErrorText
    RELEASE loImap
    RELEASE loCert
    CANCEL
ENDIF

*  Provide the client certificate BEFORE connecting.
lnSuccess = loImap.SetSslClientCert(loCert)
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    RELEASE loCert
    CANCEL
ENDIF

lnSuccess = loImap.Connect("imap.example.com")
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    RELEASE loCert
    CANCEL
ENDIF

lnSuccess = loImap.Login("user@example.com","myPassword")
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    RELEASE loCert
    CANCEL
ENDIF

lnSuccess = loImap.Disconnect()
IF (lnSuccess = 0) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    RELEASE loCert
    CANCEL
ENDIF

RELEASE loImap
RELEASE loCert