87 lines
3.6 KiB
C
87 lines
3.6 KiB
C
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/*****************************************************************************\
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FILE: autosecurity.h
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DESCRIPTION:
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Helpers functions to check if an Automation interface or ActiveX Control
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is hosted or used by a safe caller.
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BryanSt 8/20/1999
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Copyright (C) Microsoft Corp 1999-1999. All rights reserved.
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\*****************************************************************************/
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#ifndef _AUTOMATION_SECURITY_H_
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#define _AUTOMATION_SECURITY_H_
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#include <ocidl.h> // IObjectWithSite
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#include <shlwapip.h> // IUnknown_AtomicRelease
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#include <ccstock.h> // ATOMICRELEASE
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#include <mshtml.h>
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#include <cowsite.h> // CObjectWithSite
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#include <objsafe.h> // IObjectSafety
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#include <cobjsafe.h> // CObjectSafety
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/***************************************************************\
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DESCRIPTION:
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This class will provide standard security functions that
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most ActiveX Controls or scriptable COM objects need.
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HOW TO USE THIS CLASS:
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1. If you don't want any security, don't implement this
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interface and don't implement IObjectSafety. This should
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prevent your class from being used from any unsafe hosts.
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2. Create a list of any of your automation methods and actions
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invoked from your ActiveX Control's UI that can harm the user.
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3. For each of those methods/actions, decide if:
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A) It's only safe from hosts that are always safe (like HTA)
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B) It's only safe from hosts if their content is from
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a safe zone (Local Zone/Local Machine).
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C) If an UrlAction needs to be checked before the operation
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can be carried out.
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4. Based on #3, use IsSafeHost(), IsHostLocalZone(),
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or IsUrlActionAllowed() respectively.
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5. Call MakeObjectSafe on any object you create unless you
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can GUARANTEE that it will be IMPOSSIBLE for an unsafe
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caller to use it directly or indirectly to do something
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unsafe.
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An example of a direct case is a collection object
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creating an item object and then returning it to the unsafe
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host. Since the host didn't create the object, it didn't
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get a chance to correctly use IObjectSafety, so
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MakeObjectSafe() is needed.
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An example of an indirect case is where unsafe code calls
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one of your automation methods and you decide to carry out
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the action. If you create a helper object to perform a task
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and you can't guarantee that it will be safe, you need to
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call MakeObjectSafe on that object so it can decide
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internally if it's safe.
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WARNING: If MakeObjectSafe returns a FAILED(hr),
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then ppunk will be FREED because it isn't safe to use.
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\***************************************************************/
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#define CAS_NONE 0x00000000 // None
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#define CAS_REG_VALIDATION 0x00000001 // Verify the host HTML is registered
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#define CAS_PROMPT_USER 0x00000002 // If the HTML isn't registered, prompt the user if they want to use it anyway.
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class CAutomationSecurity : public CObjectWithSite
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, public CObjectSafety
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{
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public:
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//////////////////////////////////////////////////////
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// Public Methods
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//////////////////////////////////////////////////////
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BOOL IsSafeHost(OUT OPTIONAL HRESULT * phr);
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BOOL IsHostLocalZone(IN DWORD dwFlags, OUT OPTIONAL HRESULT * phr);
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BOOL IsUrlActionAllowed(IN IInternetHostSecurityManager * pihsm, IN DWORD dwUrlAction, IN DWORD dwFlags, OUT OPTIONAL HRESULT * phr);
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HRESULT MakeObjectSafe(IN OUT IUnknown ** ppunk);
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};
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#endif // _AUTOMATION_SECURITY_H_
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