Advertise Acceptable Client CA Names for Mutual TLS

See more Socket/SSL/TLS Examples

Demonstrates Socket.AddSslAcceptableClientCaDn, which adds a certificate-authority distinguished name to the list a TLS server advertises when requesting a client certificate for mutual TLS.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

var
success: Integer;
socket: TChilkatSocket;
pfxPassword: WideString;
cert: TChilkatCert;

begin
success := 0;

socket := TChilkatSocket.Create(Self);

//  For mutual TLS, advertise the acceptable client-certificate CA distinguished names BEFORE
//  initializing server-side TLS.  Call once for each acceptable CA distinguished name.
success := socket.AddSslAcceptableClientCaDn('CN=Example Root CA, O=Example, C=US');
if (success = 0) then
  begin
    Memo1.Lines.Add(socket.LastErrorText);
    Exit;
  end;
success := socket.AddSslAcceptableClientCaDn('CN=Example Intermediate CA, O=Example, C=US');
if (success = 0) then
  begin
    Memo1.Lines.Add(socket.LastErrorText);
    Exit;
  end;

//  The file path is relative to the application's current working directory.  An absolute path
//  may also be used.  Supply the path appropriate to your own environment.
//  The PFX password should come from a secure source rather than being hard-coded.
pfxPassword := 'myPfxPassword';
cert := TChilkatCert.Create(Self);
success := cert.LoadPfxFile('qa_data/server.pfx',pfxPassword);
if (success = 0) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

//  Initialize server-side TLS.  The server will now request a client certificate and advertise the
//  acceptable CA distinguished names added above.
success := socket.InitSslServer(cert.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(socket.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('Server-side TLS configured to request client certificates.');