如何在Indy 10中启用Perfect Forward Secrecy？

Question

我在Delphi 2010中使用OpenSSL 1.0.2o和Indy 10.6.2。

这是我到目前为止所做的：

procedure TServerForm.FormCreate(Sender: TObject);
var
  LEcdh: PEC_KEY;
  FSslCtx: PSSL_CTX;
  SSL: PSSL;
  FSSLContext: TIdSSLContext;
begin
  //mServer.Active := True;
  FSingle:=TCriticalSection.Create;
  appdir := ExtractFilePath(ParamStr(0));
  IdServerIOHandlerSSLOpenSSL1.SSLOptions.RootCertFile := appdir + 'EccCA.pem';
  IdServerIOHandlerSSLOpenSSL1.SSLOptions.KeyFile := appdir + 'EccSite.key';
  IdServerIOHandlerSSLOpenSSL1.SSLOptions.CertFile := appdir + 'EccSite.pem';
  IdServerIOHandlerSSLOpenSSL1.SSLOptions.DHParamsFile := appdir + 'dhparam.pem';
  IdServerIOHandlerSSLOpenSSL1.SSLOptions.Method := sslvTLSv1_2;
  IdServerIOHandlerSSLOpenSSL1.SSLOptions.SSLVersions := [sslvTLSv1_2];
  IdServerIOHandlerSSLOpenSSL1.SSLOptions.CipherList := 
    //'ECDHE-ECDSA-AES128-GCM-SHA256:' +
    'ECDHE-RSA-AES128-GCM-SHA256:' +
    //'ECDHE-RSA-AES256-GCM-SHA384:' +
    //'ECDHE-ECDSA-AES256-GCM-SHA384:' +
    //'DHE-RSA-AES128-GCM-SHA256:' +
    //'ECDHE-RSA-AES128-SHA256:' +
    //'DHE-RSA-AES128-SHA256:' +
    //'ECDHE-RSA-AES256-SHA384:' +
    //'DHE-RSA-AES256-SHA384:' +
    //'ECDHE-RSA-AES256-SHA256:' +
    //'DHE-RSA-AES256-SHA256:' +
    'HIGH:' +
    '!aNULL:' +
    '!eNULL:' +
    '!EXPORT:' +
    '!DES:' +
    '!RC4:' +
    '!MD5:' +
    '!PSK:' +
    '!SRP:' +
    '!CAMELLIA';

  MServer.IndyServer.IOHandler := IdServerIOHandlerSSLOpenSSL1;
  mServer.Active := True;
  //FSSLContext := TIdSSLContext(IdServerIOHandlerSSLOpenSSL1.SSLContext);
end;

This不起作用。

有没有人有好的建议？

Answer 1

首先，请确保将您的Indy版本更新为最新的SVN快照。在与Embarcadero论坛上的Roberto Frances一起参加的previous discussion之后，我将SSL_CTRL_SET_ECDH_AUTO和SSL_CTX_set_ecdh_auto()添加到了Indy的IdSSLOpenSSLHeaders单位。

因此，在其他讨论中代码中唯一缺少的是TMyIdSSLContext的定义，我假设它只是这样：

type
  TMyIdSSLContext = class(TIdSSLContext)
  end;

由于TIdSSLContext.fContext成员被宣布为protected，宣布TMyIdSSLContext的单位可以获得TIdSSLContext受保护成员的访问权。因此，您的代码可能如下所示：

type
  TMyIdSSLContext = class(TIdSSLContext)
  end;

procedure TServerForm.FormCreate(Sender: TObject);
var
  FSSLContext: TMyIdSSLContext;
begin
  FSingle := TCriticalSection.Create;
  appdir := ExtractFilePath(ParamStr(0));
  IdServerIOHandlerSSLOpenSSL1.SSLOptions.RootCertFile := appdir + 'EccCA.pem';
  IdServerIOHandlerSSLOpenSSL1.SSLOptions.KeyFile := appdir + 'EccSite.key';
  IdServerIOHandlerSSLOpenSSL1.SSLOptions.CertFile := appdir + 'EccSite.pem';
  IdServerIOHandlerSSLOpenSSL1.SSLOptions.DHParamsFile := appdir + 'dhparam.pem';
  IdServerIOHandlerSSLOpenSSL1.SSLOptions.Method := sslvTLSv1_2;
  IdServerIOHandlerSSLOpenSSL1.SSLOptions.SSLVersions := [sslvTLSv1_2];
  IdServerIOHandlerSSLOpenSSL1.SSLOptions.CipherList := 
    //'ECDHE-ECDSA-AES128-GCM-SHA256:' +
    'ECDHE-RSA-AES128-GCM-SHA256:' +
    //'ECDHE-RSA-AES256-GCM-SHA384:' +
    //'ECDHE-ECDSA-AES256-GCM-SHA384:' +
    //'DHE-RSA-AES128-GCM-SHA256:' +
    //'ECDHE-RSA-AES128-SHA256:' +
    //'DHE-RSA-AES128-SHA256:' +
    //'ECDHE-RSA-AES256-SHA384:' +
    //'DHE-RSA-AES256-SHA384:' +
    //'ECDHE-RSA-AES256-SHA256:' +
    //'DHE-RSA-AES256-SHA256:' +
    'HIGH:' +
    '!aNULL:' +
    '!eNULL:' +
    '!EXPORT:' +
    '!DES:' +
    '!RC4:' +
    '!MD5:' +
    '!PSK:' +
    '!SRP:' +
    '!CAMELLIA';

  MServer.IndyServer.IOHandler := IdServerIOHandlerSSLOpenSSL1;
  mServer.Active := True;

  FSSLContext := TMyIdSSLContext(IdServerIOHandlerSSLOpenSSL1.SSLContext);
  SSL_CTX_set_ecdh_auto(FSSLContext.fContext, 1);
end;