Delphi ActiveX

SSL Server Example

See more Socket/SSL/TLS Examples

Demonstrates how to create an SSL socket for accepting connections. This example is *very* simple in that it will create an SSL socket for accepting a single connection. It will read a message from the client, send a reply, and exit. Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
listenSslSocket: TChilkatSocket;
certStore: TChilkatCertStore;
jsonCN: TChilkatJsonObject;
cert: TChilkatCert;
myPort: Integer;
backLog: Integer;
maxWaitMillisec: Integer;
clientSock: TChilkatSocket;
receivedMsg: WideString;

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 server needs a digital certificate.  This example loads it from a PFX file.

// Create an instance of a certificate store object, load a PFX file,
// locate the certificate we need, and use it.
// (a PFX file may contain more than one certificate.)
certStore := TChilkatCertStore.Create(Self);
// The 1st argument is the filename, the 2nd arg is the 
// PFX file's password:
success := certStore.LoadPfxFile('chilkat.pfx','test');
if (success = 0) then
  begin
    Memo1.Lines.Add(certStore.LastErrorText);
    Exit;
  end;

// Find the certificate to be used for SSL:
jsonCN := TChilkatJsonObject.Create(Self);
jsonCN.UpdateString('CN','example.com');

cert := TChilkatCert.Create(Self);
success := certStore.FindCert(jsonCN.ControlInterface,cert.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(certStore.LastErrorText);
    Exit;
  end;

// Use the 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;

// If accepting an SSL/TLS connection, the SSL handshake is part of the connection
// establishment process. This involves a few back-and-forth messages between the 
// client and server to establish algorithms and a shared key to create the secure 
// channel. The sending and receiving of these messages are governed by the 
// MaxReadIdleMs and MaxSendIdleMs properties. If these properties are set to 0 
// (and this is the default unless changed by your application), then the 
// AcceptNext can hang indefinitely during the SSL handshake process. 
// Make sure these properties are set to appropriate values before calling AcceptNext.

// Set a 10 second max for waiting to read/write.  This is for the SSL/TLS handshake establishment.
listenSslSocket.MaxReadIdleMs := 10000;
listenSslSocket.MaxSendIdleMs := 10000;

// Accept a single client connection and establish the secure SSL/TLS channel:
maxWaitMillisec := 20000;
clientSock := TChilkatSocket.Create(Self);
success := listenSslSocket.AcceptNext(maxWaitMillisec,clientSock.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(listenSslSocket.LastErrorText);
    Exit;
  end;

// The client (in this example) is going to send a "Hello Server! -EOM-" 
// message.  Read it:
receivedMsg := clientSock.ReceiveUntilMatch('-EOM-');
if (clientSock.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(clientSock.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add(receivedMsg);

// Send a "Hello Client! -EOM-" message:
success := clientSock.SendString('Hello Client! -EOM-');
if (success = 0) then
  begin
    Memo1.Lines.Add(clientSock.LastErrorText);
    Exit;
  end;

// Close the connection with the client
// Wait a max of 20 seconds (20000 millsec)
success := clientSock.Close(20000);
end;