Pascal (Lazarus/Delphi)

Get the Server Certificate, Certificate Chain, and Root CA Certificate

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Demonstrates how to get the HTTP server certificate, its certificate chain, and the root CA certificate. 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.CertChain,
  Chilkat.Cert;

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

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  sslCert: TCert;
  certChain: TCertChain;
  cert: TCert;
  i: Integer;
  numCerts: Integer;
  caCert: TCert;

begin
  success := False;

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

  http := THttp.Create;

  //  We're getting the SSL/TLS certificate, so make sure to connect to the SSL/TLS port (443).
  sslCert := TCert.Create;
  success := http.GetServerCert('apple.com',443,sslCert);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  certChain := TCertChain.Create;
  success := sslCert.BuildCertChain(certChain);
  if (success = False) then
    begin
      WriteLn(sslCert.LastErrorText);
      Exit;
    end;

  cert := TCert.Create;
  i := 0;
  numCerts := certChain.NumCerts;
  while i < numCerts do
    begin
      certChain.CertAt(i,cert);
      WriteLn('SubjectDN ' + i + ': ' + cert.SubjectDN);
      WriteLn('IssuerDN ' + i + ': ' + cert.IssuerDN);
      i := i + 1;
    end;

  //  If the certificate chain reaches the root CA cert, then the last cert in the chain
  //  is the root CA cert.
  if (certChain.ReachesRoot = True) then
    begin
      caCert := TCert.Create;
      certChain.CertAt(numCerts - 1,caCert);
      WriteLn('CA Root Cert: ' + caCert.SubjectDN);
    end;


  http.Free;
  sslCert.Free;
  certChain.Free;
  cert.Free;
      caCert.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.