(PowerBuilder) Accept TLS Connection with Client Authentication

Demonstrates how to accept a TLS connection requiring client authentication. This is the case where the TLS client sends a certificate. It is also known as "Two-Way SSL".

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

integer li_rc
oleobject loo_ListenSslSocket
oleobject loo_Cert
integer li_Success
integer li_MyPort
integer li_BackLog
oleobject loo_ClientSock
integer li_MaxWaitMillisec
string ls_ReceivedMsg

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

loo_ListenSslSocket = create oleobject
// Use "Chilkat_9_5_0.Socket" for versions of Chilkat < 10.0.0
li_rc = loo_ListenSslSocket.ConnectToNewObject("Chilkat.Socket")
if li_rc < 0 then
    destroy loo_ListenSslSocket
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// An SSL/TLS server needs a digital certificate.  This example loads it from a PFX file.
// Note: This is the server's certificate.

loo_Cert = create oleobject
// Use "Chilkat_9_5_0.Cert" for versions of Chilkat < 10.0.0
li_rc = loo_Cert.ConnectToNewObject("Chilkat.Cert")

// The 1st argument is the file path, the 2nd arg is the 
// PFX file's password:
li_Success = loo_Cert.LoadPfxFile("chilkat.pfx","test")
if li_Success <> 1 then
    Write-Debug loo_Cert.LastErrorText
    destroy loo_ListenSslSocket
    destroy loo_Cert
    return
end if

// To accept client client certificates in the TLS handshake,
// we must indicate a list of acceptable client certificate root CA DN's
// that are allowed.  (DN is an acronym for Distinguished Name.)
// Call AddSslAcceptableClientCaDn once for each acceptable CA DN.
// Here are a few examples so you can see the general format of a DN.
loo_ListenSslSocket.AddSslAcceptableClientCaDn("C=SE, O=AddTrust AB, OU=AddTrust External TTP Network, CN=AddTrust External CA Root")
loo_ListenSslSocket.AddSslAcceptableClientCaDn("O=Digital Signature Trust Co., CN=DST Root CA X3")

// Use the certificate:
li_Success = loo_ListenSslSocket.InitSslServer(loo_Cert)
if li_Success <> 1 then
    Write-Debug loo_ListenSslSocket.LastErrorText
    destroy loo_ListenSslSocket
    destroy loo_Cert
    return
end if

// Bind and listen on a port:
li_MyPort = 8123
// Allow for a max of 5 queued connect requests.
li_BackLog = 5
li_Success = loo_ListenSslSocket.BindAndListen(li_MyPort,li_BackLog)
if li_Success <> 1 then
    Write-Debug loo_ListenSslSocket.LastErrorText
    destroy loo_ListenSslSocket
    destroy loo_Cert
    return
end if

// If accepting an SSL/TLS connection, the SSL handshake is part of the connection
// establishment process. This involves a few back-and-forth messages between the 
// client and server to establish algorithms and a shared key to create the secure 
// channel. The sending and receiving of these messages are governed by the 
// MaxReadIdleMs and MaxSendIdleMs properties. If these properties are set to 0 
// (and this is the default unless changed by your application), then the 
// AcceptNextConnection can hang indefinitely during the SSL handshake process. 
// Make sure these properties are set to appropriate values before calling AcceptNextConnection.

// Set a 10 second max for waiting to read/write.  This is for the SSL/TLS handshake establishment.
loo_ListenSslSocket.MaxReadIdleMs = 10000
loo_ListenSslSocket.MaxSendIdleMs = 10000

// Accept a single client connection and establish the secure SSL/TLS channel:

li_MaxWaitMillisec = 20000
loo_ClientSock = loo_ListenSslSocket.AcceptNextConnection(li_MaxWaitMillisec)
if loo_ListenSslSocket.LastMethodSuccess = 0 then
    Write-Debug loo_ListenSslSocket.LastErrorText
    destroy loo_ListenSslSocket
    destroy loo_Cert
    return
end if

// The client (in this example) is going to send a "Hello Server! -EOM-" 
// message.  Read it:
ls_ReceivedMsg = loo_ClientSock.ReceiveUntilMatch("-EOM-")
if loo_ClientSock.LastMethodSuccess <> 1 then
    Write-Debug loo_ClientSock.LastErrorText
    destroy loo_ListenSslSocket
    destroy loo_Cert
    return
end if

Write-Debug ls_ReceivedMsg

// Send a "Hello Client! -EOM-" message:
li_Success = loo_ClientSock.SendString("Hello Client! -EOM-")
if li_Success <> 1 then
    Write-Debug loo_ClientSock.LastErrorText
    destroy loo_ListenSslSocket
    destroy loo_Cert
    return
end if

// Close the connection with the client
// Wait a max of 20 seconds (20000 millsec)
li_Success = loo_ClientSock.Close(20000)

destroy loo_ClientSock


destroy loo_ListenSslSocket
destroy loo_Cert