Delphi ActiveX 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. Delphi ActiveX

var
success: Integer;
listenSslSocket: TChilkatSocket;
cert: TChilkatCert;
myPort: Integer;
backLog: Integer;
maxWaitMillisec: Integer;
clientSock: TChilkatSocket;
numClientCerts: Integer;
clientCert: TChilkatCert;
i: Integer;

begin
success := 0;

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

listenSslSocket := TChilkatSocket.Create(Self);

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

cert := TChilkatCert.Create(Self);
success := cert.LoadPfxFile('qa_data/serverCert/myServerCert.pfx','pfx_password');
if (success = 0) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

//  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.
listenSslSocket.AddSslAcceptableClientCaDn('C=SE, O=AddTrust AB, OU=AddTrust External TTP Network, CN=AddTrust External CA Root');
listenSslSocket.AddSslAcceptableClientCaDn('O=Digital Signature Trust Co., CN=DST Root CA X3');

//  Initialize with our server's TLS certificate.
success := listenSslSocket.InitSslServer(cert.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(listenSslSocket.LastErrorText);
    Exit;
  end;

//  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 = 0) then
  begin
    Memo1.Lines.Add(listenSslSocket.LastErrorText);
    Exit;
  end;

//  Accept the next incoming connection.
maxWaitMillisec := 20000;

clientSock := TChilkatSocket.Create(Self);
success := listenSslSocket.AcceptNext(maxWaitMillisec,clientSock.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(listenSslSocket.LastErrorText);
    Exit;
  end;

//  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;
Memo1.Lines.Add('numClientCerts = ' + IntToStr(numClientCerts));

clientCert := TChilkatCert.Create(Self);
i := 0;
while i < numClientCerts do
  begin
    clientSock.GetRcvdClientCert(i,clientCert.ControlInterface);
    Memo1.Lines.Add(clientCert.SubjectDN);
    i := i + 1;
  end;

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