Get a Received Client Certificate (Server Side)

See more Socket/SSL/TLS Examples

Demonstrates Socket.GetRcvdClientCert, which copies a client certificate presented during the TLS handshake of an accepted server-side connection into a Cert object.

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.

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Cert,
  Chilkat.Socket;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  socket: TSocket;
  pfxPassword: string;
  cert: TCert;
  connectedSock: TSocket;
  numClientCerts: Integer;
  clientCert: TCert;
  i: Integer;

begin
  success := False;

  socket := TSocket.Create;

  //  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 := TCert.Create;
  success := cert.LoadPfxFile('qa_data/server.pfx',pfxPassword);
  if (success = False) then
    begin
      WriteLn(cert.LastErrorText);
      Exit;
    end;

  success := socket.InitSslServer(cert);
  if (success = False) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;
  success := socket.BindAndListen(5000,25);
  if (success = False) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

  //  Accept a client connection.  The accepted connection carries any client certificate presented
  //  during the TLS handshake.
  connectedSock := TSocket.Create;
  success := socket.AcceptNext(20000,connectedSock);
  if (success = False) then
    begin
      WriteLn(socket.LastErrorText);
      Exit;
    end;

  //  Copy each received client certificate and inspect it.
  numClientCerts := connectedSock.NumReceivedClientCerts;
  clientCert := TCert.Create;

  for i := 0 to numClientCerts - 1 do
    begin
      success := connectedSock.GetRcvdClientCert(i,clientCert);
      if (success = False) then
        begin
          WriteLn(connectedSock.LastErrorText);
          Exit;
        end;
      WriteLn('Client certificate subject: ' + clientCert.SubjectCN);
    end;



  socket.Free;
  cert.Free;
  connectedSock.Free;
  clientCert.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.