Xojo Plugin Requires Chilkat v11.0.0+

Examine Client Certificates for an Accepted TLS Connection

See more Socket/SSL/TLS Examples

Demonstrates how to access the client certificates for a TLS connection accepted by your application acting as the server. Xojo Plugin

Dim success As Boolean
success = False

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

Dim listenSslSocket As New Chilkat.Socket

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

Dim cert As New Chilkat.Cert
success = cert.LoadPfxFile("qa_data/serverCert/myServerCert.pfx","pfx_password")
If (success = False) Then
    System.DebugLog(cert.LastErrorText)
    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.
success = listenSslSocket.AddSslAcceptableClientCaDn("C=SE, O=AddTrust AB, OU=AddTrust External TTP Network, CN=AddTrust External CA Root")
success = listenSslSocket.AddSslAcceptableClientCaDn("O=Digital Signature Trust Co., CN=DST Root CA X3")

//  Initialize with our server's TLS certificate.
success = listenSslSocket.InitSslServer(cert)
If (success = False) Then
    System.DebugLog(listenSslSocket.LastErrorText)
    Return
End If

//  Bind and listen on a port:
Dim myPort As Int32
myPort = 8123
//  Allow for a max of 5 queued connect requests.
Dim backLog As Int32
backLog = 5
success = listenSslSocket.BindAndListen(myPort,backLog)
If (success = False) Then
    System.DebugLog(listenSslSocket.LastErrorText)
    Return
End If

//  Accept the next incoming connection.
Dim maxWaitMillisec As Int32
maxWaitMillisec = 20000

Dim clientSock As New Chilkat.Socket
success = listenSslSocket.AcceptNext(maxWaitMillisec,clientSock)
If (success = False) Then
    System.DebugLog(listenSslSocket.LastErrorText)
    Return
End If

//  Examine the client certs chain.  The 1st cert will be the client certificate, and
//  the subsequent certs will be the certs in the chain of authentication.
Dim numClientCerts As Int32
numClientCerts = clientSock.NumReceivedClientCerts
System.DebugLog("numClientCerts = " + Str(numClientCerts))

Dim clientCert As New Chilkat.Cert
Dim i As Int32
i = 0
While i < numClientCerts
    success = clientSock.GetRcvdClientCert(i,clientCert)
    System.DebugLog(clientCert.SubjectDN)
    i = i + 1
Wend

//  Close the connection with the client
success = clientSock.Close(1000)