ActiveX控件安全初始化之一:实现ISafeObject接口

转自：http://www.cnblogs.com/carekee/articles/1772201.html

ActiveX控件打包成cab后,在脚本中调用中时,要保证控件的安全性才能在你的网页上安全运行,有两种方法来实现这一保证:实现一个名称为IObjectSafe的接口到你的控件。如果IE发现你的控件支持IObjectSafety，它调用 IObjectSafety::SetInterfaceSafetyOptions 方法然后才载入你的控件。另外一种方法需要修改注册表，我将会在另外一篇文章中详细介绍。

1。创建了一个叫做“tryISafeObject.ocx”的MFC ActiveX控件。

2。在tryISafeObjectCtrl.h中定义ISafeObject接口：

#include <objsafe.h> // for IObjectSafety; in ActiveX SDK
class CtryISafeObjectCtrl : public COleControl
{
DECLARE_DYNCREATE(CtryISafeObjectCtrl)
//........................................................................
//ISafeObject
DECLARE_INTERFACE_MAP()
BEGIN_INTERFACE_PART(ObjSafe, IObjectSafety)
STDMETHOD_(HRESULT, GetInterfaceSafetyOptions) (
/* [in] */ REFIID riid,
/* [out] */ DWORD __RPC_FAR *pdwSupportedOptions,
/* [out] */ DWORD __RPC_FAR *pdwEnabledOptions
);

STDMETHOD_(HRESULT, SetInterfaceSafetyOptions) (
/* [in] */ REFIID riid,
/* [in] */ DWORD dwOptionSetMask,
/* [in] */ DWORD dwEnabledOptions
);
END_INTERFACE_PART(ObjSafe);
//ISafeObject
//........................................................................
};

在objsafe.h头文件中有ISafeObject接口的相关定义

3。在tryISafeObjectCtrl.cpp中ISafeObject接口的相关实现：

//.............................................................................
// Interface map for IObjectSafety
BEGIN_INTERFACE_MAP( CtryISafeObjectCtrl, COleControl )
INTERFACE_PART(CtryISafeObjectCtrl, IID_IObjectSafety, ObjSafe)
END_INTERFACE_MAP()
//.............................................................................
// IObjectSafety member functions
// Delegate AddRef, Release, QueryInterface
ULONG FAR EXPORT CtryISafeObjectCtrl::XObjSafe::AddRef()
{
METHOD_PROLOGUE(CtryISafeObjectCtrl, ObjSafe)
return pThis->ExternalAddRef();
}
ULONG FAR EXPORT CtryISafeObjectCtrl::XObjSafe::Release()
{
METHOD_PROLOGUE(CtryISafeObjectCtrl, ObjSafe)
return pThis->ExternalRelease();
}
HRESULT FAR EXPORT CtryISafeObjectCtrl::XObjSafe::QueryInterface(
REFIID iid, void FAR* FAR* ppvObj)
{
METHOD_PROLOGUE(CtryISafeObjectCtrl, ObjSafe)
return (HRESULT)pThis->ExternalQueryInterface(&iid, ppvObj);
}
const DWORD dwSupportedBits =
INTERFACESAFE_FOR_UNTRUSTED_CALLER |
INTERFACESAFE_FOR_UNTRUSTED_DATA;
const DWORD dwNotSupportedBits = ~ dwSupportedBits;
//.............................................................................
// CStopLiteCtrl::XObjSafe::GetInterfaceSafetyOptions
// Allows container to query what interfaces are safe for what. We're
// optimizing significantly by ignoring which interface the caller is
// asking for.
HRESULT STDMETHODCALLTYPE
CtryISafeObjectCtrl::XObjSafe::GetInterfaceSafetyOptions(
/* [in] */ REFIID riid,
/* [out] */ DWORD __RPC_FAR *pdwSupportedOptions,
/* [out] */ DWORD __RPC_FAR *pdwEnabledOptions)
{
METHOD_PROLOGUE(CtryISafeObjectCtrl, ObjSafe)
HRESULT retval = ResultFromScode(S_OK);
// does interface exist?
IUnknown FAR* punkInterface;
retval = pThis->ExternalQueryInterface(&riid,
(void * *)&punkInterface);
if (retval != E_NOINTERFACE) { // interface exists
punkInterface->Release(); // release it--just checking!
}

// we support both kinds of safety and have always both set,
// regardless of interface
*pdwSupportedOptions = *pdwEnabledOptions = dwSupportedBits;
return retval; // E_NOINTERFACE if QI failed
}
/////////////////////////////////////////////////////////////////////////////
// CStopLiteCtrl::XObjSafe::SetInterfaceSafetyOptions
// Since we're always safe, this is a no-brainer--but we do check to make
// sure the interface requested exists and that the options we're asked to
// set exist and are set on (we don't support unsafe mode).
HRESULT STDMETHODCALLTYPE
CtryISafeObjectCtrl::XObjSafe::SetInterfaceSafetyOptions(
/* [in] */ REFIID riid,
/* [in] */ DWORD dwOptionSetMask,
/* [in] */ DWORD dwEnabledOptions)
{
METHOD_PROLOGUE(CtryISafeObjectCtrl, ObjSafe)

// does interface exist?
IUnknown FAR* punkInterface;
pThis->ExternalQueryInterface(&riid, (void * *)&punkInterface);
if (punkInterface) { // interface exists
punkInterface->Release(); // release it--just checking!
}
else { // interface doesn't exist
return ResultFromScode(E_NOINTERFACE);
}
// can't set bits we don't support
if (dwOptionSetMask & dwNotSupportedBits) {
return ResultFromScode(E_FAIL);
}

// can't set bits we do support to zero
dwEnabledOptions &= dwSupportedBits;
// (we already know there are no extra bits in mask )
if ((dwOptionSetMask & dwEnabledOptions) !=
dwOptionSetMask) {
return ResultFromScode(E_FAIL);
}

// don't need to change anything since we're always safe
return ResultFromScode(S_OK);
}