(Classic ASP) Examine Client Certificates for an Accepted TLS Connection

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

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

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

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Socket")
set listenSslSocket = Server.CreateObject("Chilkat.Socket")

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

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Cert")
set cert = Server.CreateObject("Chilkat.Cert")
success = cert.LoadPfxFile("qa_data/serverCert/myServerCert.pfx","pfx_password")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( cert.LastErrorText) & "</pre>"
    Response.End
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 <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( listenSslSocket.LastErrorText) & "</pre>"
    Response.End
End If

' Bind and listen on a port:
myPort = 8123
' Allow for a max of 5 queued connect requests.
backLog = 5
success = listenSslSocket.BindAndListen(myPort,backLog)
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( listenSslSocket.LastErrorText) & "</pre>"
    Response.End
End If

' Accept the next incoming connection.
maxWaitMillisec = 20000
' clientSock is a Chilkat.Socket
Set clientSock = listenSslSocket.AcceptNextConnection(maxWaitMillisec)
If (listenSslSocket.LastMethodSuccess = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( listenSslSocket.LastErrorText) & "</pre>"
    Response.End
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.
numClientCerts = clientSock.NumReceivedClientCerts
Response.Write "<pre>" & Server.HTMLEncode( "numClientCerts = " & numClientCerts) & "</pre>"

i = 0
Do While i < numClientCerts
    ' clientCert is a Chilkat.Cert
    Set clientCert = clientSock.GetReceivedClientCert(i)
    Response.Write "<pre>" & Server.HTMLEncode( clientCert.SubjectDN) & "</pre>"

    i = i + 1
Loop

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


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