Pascal (Lazarus/Delphi)

(PKCS11) Use a Smart Card Certificate + Private Key for SSL/TLS Authentication

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Demonstrates how to use a certificate + private key located on a smart card for the TLS client certificate in an HTTPS request. Pascal (Lazarus/Delphi)

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.Http,
  Chilkat.Pkcs11,
  Chilkat.Cert;

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

procedure RunDemo;
var
  success: Boolean;
  pkcs11: TPkcs11;
  slotID: Integer;
  readWrite: Boolean;
  userType: Integer;
  pin: string;
  cert: TCert;
  http: THttp;
  responseBody: string;

begin
  success := False;

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

  //  Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

  pkcs11 := TPkcs11.Create;

  //  Set your shared lib path -- either a full path to the DLL, .so, or .dylib,
  //  or just the filename if the driver is in a location that can be automatically found. (Such as in C:\Windows\System32)
  pkcs11.SharedLibPath := 'C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll';

  success := pkcs11.Initialize();
  if (success = False) then
    begin
      WriteLn(pkcs11.LastErrorText);
      Exit;
    end;

  //  Pass -1 for the slotID to open a session on the first non-empty slot.
  slotID := -1;

  //  Open a session.
  readWrite := True;
  success := pkcs11.OpenSession(slotID,readWrite);
  if (success = False) then
    begin
      WriteLn(pkcs11.LastErrorText);
      Exit;
    end;

  //  Make it an authenticated session by calling Login.
  //  
  //  If we don't authenticate, then we won't be able to see the private keys, and thus
  //  we won't know which certificates have an associated private key stored on the smart card.

  //  The smart card PIN is passed to the Login method.
  //  userType 1 indicates a "Normal User".
  userType := 1;
  pin := '0000';
  success := pkcs11.Login(userType,pin);
  if (success = False) then
    begin
      WriteLn(pkcs11.LastErrorText);
      success := pkcs11.CloseSession();
      Exit;
    end;

  cert := TCert.Create;

  //  Find a certificate by the Subject Common Name
  success := pkcs11.FindCert('subjectCN','BadSSL Client Certificate',cert);
  if (success = True) then
    begin
      WriteLn('Found: ' + cert.SubjectCN);
    end
  else
    begin
      WriteLn('Not found: ' + cert.SubjectCN);
      success := pkcs11.CloseSession();
      Exit;
    end;

  WriteLn('Successfully loaded the cert object from the smart card / USB token.');

  //  Note: When successful, the cert object is internally linked to the Pkcs11 object's authenticated session.
  //  The cert object can now be used to sign or do other cryptographic operations that occur on the smart card / USB token.

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

  //  Send an HTTPS request to https://client.badssl.com
  //  https://client.badssl.com (part of the badssl.com service) lets you test authentication using client SSL certificates. 
  //  The client certificate can be downloaded from https://badssl.com/download/.
  //  This server returns 200 OK if the correct client certificate is provided, and 400 Bad Request otherwise.

  http := THttp.Create;

  //  Provide the client certificate (linked internally to our authenticated smartcard session)
  success := http.SetSslClientCert(cert);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      success := pkcs11.CloseSession();
      Exit;
    end;

  responseBody := http.QuickGetStr('https://client.badssl.com/');
  if (http.LastMethodSuccess = False) then
    begin
      WriteLn(http.LastErrorText);
      success := pkcs11.CloseSession();
      Exit;
    end;

  WriteLn('Response status code: ' + http.LastStatus);
  WriteLn('Response body: ');
  WriteLn(responseBody);

  //  ------------------------------------------------------------------------------------------------------------
  //  Revert to an unauthenticated session by calling Logout.
  success := pkcs11.Logout();
  if (success = False) then
    begin
      WriteLn(pkcs11.LastErrorText);
      success := pkcs11.CloseSession();
      Exit;
    end;

  //  When finished, close the session.
  //  It is important to close the session (memory leaks will occur if the session is not properly closed).
  success := pkcs11.CloseSession();
  if (success = False) then
    begin
      WriteLn(pkcs11.LastErrorText);
      Exit;
    end;

  WriteLn('Success.');


  pkcs11.Free;
  cert.Free;
  http.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.