295 lines
11 KiB
C++
295 lines
11 KiB
C++
/*****************************************************************************\
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FILE: security.cpp
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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 8/25/1999
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Copyright (C) Microsoft Corp 1999-1999. All rights reserved.
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\*****************************************************************************/
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#include "stock.h"
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#pragma hdrstop
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#include <mshtml.h>
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/***************************************************************\
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DESCRIPTION:
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We are given a site via IObjectWithSite. Obtain the host
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from there.
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These are the different scenarios to test against:
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1. HTA Content.
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2. HTA contains IFRAME to non-LocalZone. That frame
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needs to be treated as unsafe because it hasn't been
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"sandboxed"
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3. HTA contains IFRAME to non-LocalZone except the IFRAME tag has
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<IFRAME APPLICATION="Yes" SRC="non-LocalZone:foo.htm" ...>
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so we need to treat this as safe.
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4. LocalZone Web page with Object. It has an IFRAME to an
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non-LocalZone. Is scripting from IFRAME to object allowed? [HUNTER?]
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5. non-LocalZone Web page. It has an IFRAME to an LocalZone with Object.
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Is scripting from parent to IFRAME object allowed? [HUNTER?]
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6. LocalZone Web page. It has 2 IFRAMEs. One is in the LocalZone and
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has an Object. The other is non-LocalZone. Can the non-LocalZone
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script across frames to the object? [HUNTER?]
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7. VB or MFC host.
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8. HTML Mail Message with object. This should be treated as
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non-LocalMachine? [HUNTER?]
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\***************************************************************/
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STDAPI GetHTMLDoc2(IUnknown *punk, IHTMLDocument2 **ppHtmlDoc)
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{
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*ppHtmlDoc = NULL;
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if (!punk)
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return E_FAIL;
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*ppHtmlDoc = NULL;
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// The window.external, jscript "new ActiveXObject" and the <OBJECT> tag
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// don't take us down the same road.
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IOleClientSite *pClientSite;
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HRESULT hr = punk->QueryInterface(IID_PPV_ARG(IOleClientSite, &pClientSite));
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if (SUCCEEDED(hr))
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{
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// <OBJECT> tag path
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IOleContainer *pContainer;
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// This will return the interface for the current FRAME containing the
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// OBJECT tag. We will only check that frames security because we
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// rely on MSHTML to block cross frame scripting when it isn't safe.
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hr = pClientSite->GetContainer(&pContainer);
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if (SUCCEEDED(hr))
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{
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hr = pContainer->QueryInterface(IID_PPV_ARG(IHTMLDocument2, ppHtmlDoc));
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pContainer->Release();
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}
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if (FAILED(hr))
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{
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// window.external path
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IWebBrowser2 *pWebBrowser2;
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hr = IUnknown_QueryService(pClientSite, SID_SWebBrowserApp, IID_PPV_ARG(IWebBrowser2, &pWebBrowser2));
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if (SUCCEEDED(hr))
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{
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IDispatch *pDispatch;
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hr = pWebBrowser2->get_Document(&pDispatch);
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if (SUCCEEDED(hr))
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{
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hr = pDispatch->QueryInterface(IID_PPV_ARG(IHTMLDocument2, ppHtmlDoc));
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pDispatch->Release();
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}
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pWebBrowser2->Release();
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}
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}
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pClientSite->Release();
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}
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else
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{
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// jscript path
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hr = IUnknown_QueryService(punk, SID_SContainerDispatch, IID_PPV_ARG(IHTMLDocument2, ppHtmlDoc));
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}
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ASSERT(FAILED(hr) || (*ppHtmlDoc));
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return hr;
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}
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/***************************************************************\
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DESCRIPTION:
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This function is supposed to find out the zone from the
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specified URL or Path.
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\***************************************************************/
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STDAPI LocalZoneCheckPath(LPCWSTR pszUrl, IUnknown * punkSite)
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{
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DWORD dwZoneID = URLZONE_UNTRUSTED;
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HRESULT hr = GetZoneFromUrl(pszUrl, punkSite, &dwZoneID);
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if (SUCCEEDED(hr))
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{
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if (dwZoneID == URLZONE_LOCAL_MACHINE)
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hr = S_OK;
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else
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hr = E_ACCESSDENIED;
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}
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return hr;
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}
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/***************************************************************\
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DESCRIPTION:
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Get the zone from the specified URL or Path.
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\***************************************************************/
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STDAPI GetZoneFromUrl(LPCWSTR pszUrl, IUnknown * punkSite, DWORD * pdwZoneID)
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{
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HRESULT hr = E_FAIL;
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if (pszUrl && pdwZoneID)
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{
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IInternetSecurityManager * pSecMgr = NULL;
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// WARNING: IInternetSecurityManager is the guy who translates
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// from URL->Zone. If we CoCreate this object, it will do the
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// default mapping. Some hosts, like Outlook Express, want to
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// over ride the default mapping in order to sandbox some content.
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// I beleive this could be used to force HTML in an email
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// message (C:\mailmessage.eml) to act like it's from a more
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// untrusted zone. We use QueryService to get this interface
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// from our host. This info is from SanjayS. (BryanSt 8/21/1999)
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hr = IUnknown_QueryService(punkSite, SID_SInternetSecurityManager, IID_PPV_ARG(IInternetSecurityManager, &pSecMgr));
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if (SUCCEEDED(hr))
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{
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hr = pSecMgr->MapUrlToZone(pszUrl, pdwZoneID, 0);
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ATOMICRELEASE(pSecMgr);
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}
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if (FAILED(hr))
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{
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hr = CoCreateInstance(CLSID_InternetSecurityManager, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARG(IInternetSecurityManager, &pSecMgr));
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if (SUCCEEDED(hr))
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{
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hr = pSecMgr->MapUrlToZone(pszUrl, pdwZoneID, 0);
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ATOMICRELEASE(pSecMgr);
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}
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}
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}
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else
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{
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hr = E_INVALIDARG;
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}
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return hr;
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}
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/***************************************************************\
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DESCRIPTION:
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We are given a site via IObjectWithSite. See if that host
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maps to the Local Zone.
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These are the different scenarios to test against:
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1. HTA Content.
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2. HTA contains IFRAME to non-LocalZone. That frame
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needs to be treated as unsafe because it hasn't been
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"sandboxed"
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3. HTA contains IFRAME to non-LocalZone except the IFRAME tag has
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<IFRAME APPLICATION="Yes" SRC="non-LocalZone:foo.htm" ...>
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so we need to treat this as safe.
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4. LocalZone Web page with Object. It has an IFRAME to an
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non-LocalZone. Is scripting from IFRAME to object allowed? [HUNTER?]
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5. non-LocalZone Web page. It has an IFRAME to an LocalZone with Object.
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Is scripting from parent to IFRAME object allowed? [HUNTER?]
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6. LocalZone Web page. It has 2 IFRAMEs. One is in the LocalZone and
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has an Object. The other is non-LocalZone. Can the non-LocalZone
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script across frames to the object? [HUNTER?]
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7. VB or MFC host.
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8. HTML Mail Message with object. This should be treated as
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non-LocalMachine? [HUNTER?]
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\***************************************************************/
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STDAPI LocalZoneCheck(IUnknown *punkSite)
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{
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DWORD dwZoneID = URLZONE_UNTRUSTED;
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HRESULT hr = GetZoneFromSite(punkSite, &dwZoneID);
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if (SUCCEEDED(hr))
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{
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if (dwZoneID == URLZONE_LOCAL_MACHINE)
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hr = S_OK;
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else
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hr = E_ACCESSDENIED;
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}
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return hr;
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}
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STDAPI GetZoneFromSite(IUnknown *punkSite, DWORD *pdwZoneID)
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{
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// Return S_FALSE if we don't have a host site since we have no way of doing a
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// security check. This is as far as VB 5.0 apps get.
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if (!punkSite)
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{
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*pdwZoneID = URLZONE_UNTRUSTED;
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return S_FALSE;
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}
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HRESULT hr = E_ACCESSDENIED;
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BOOL fTriedBrowser = FALSE;
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// Try to find the original template path for zone checking
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IOleCommandTarget * pct;
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if (SUCCEEDED(IUnknown_QueryService(punkSite, SID_DefView, IID_PPV_ARG(IOleCommandTarget, &pct))))
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{
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VARIANT vTemplatePath;
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vTemplatePath.vt = VT_EMPTY;
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if (pct->Exec(&CGID_DefView, DVCMDID_GETTEMPLATEDIRNAME, 0, NULL, &vTemplatePath) == S_OK)
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{
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fTriedBrowser = TRUE;
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if (vTemplatePath.vt == VT_BSTR)
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{
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hr = GetZoneFromUrl(vTemplatePath.bstrVal, punkSite, pdwZoneID);
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}
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// We were able to talk to the browser, so don't fall back on Trident because they may be
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// less secure.
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fTriedBrowser = TRUE;
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VariantClear(&vTemplatePath);
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}
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pct->Release();
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}
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// If this is one of those cases where the browser doesn't exist (AOL, VB, ...) then
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// we will check the scripts security. If we did ask the browser, don't ask trident
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// because the browser is often more restrictive in some cases.
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if (!fTriedBrowser && (hr != S_OK))
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{
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// Try to use the URL from the document to zone check
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IHTMLDocument2 *pHtmlDoc;
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/***************************************************************\
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NOTE:
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1. If punkSite points into an <IFRAME APPLICATION="yes"> in a
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HTA file, then the URL GetHTMLDoc2() returns
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is for the IFRAME SRC..
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BUGS?:
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1. If this isn't an HTML container, the we will be saying that it
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isn't safe. For example, if the container is VB and they support
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the security interfaces, then we will assume it isn't safe when
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it is. (Is there an IInternet interface that will work in this
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case?)
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\***************************************************************/
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if (SUCCEEDED(GetHTMLDoc2(punkSite, &pHtmlDoc)))
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{
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BSTR bstrURL;
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/***************************************************************\
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WARNING: (Security Holes?)
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I think this is fundamentally flawed because:
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1. If this HTML container isn't safe but it's URL maps to the
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Local Zone, then we have a problem. This may happen with
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email messages, especially if they are saved to a file.
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If the user reopens a saved .eml file, it will be hosted in
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it's mail container that may support the IInternet interface
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to indicate that it's in an untrusted zone. Will we get
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a Local Zone URL in that case?
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TO INVESTIGATE: (HunterH?)
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1. What is the parent HTML is LocalZone but the subframes aren't.
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Will trident block cross frame scripting?
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\***************************************************************/
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if (SUCCEEDED(pHtmlDoc->get_URL(&bstrURL)))
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{
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// NOTE: the above URL is improperly escaped, this is
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// due to app compat. if you depend on this URL being valid
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// use another means to get this
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hr = GetZoneFromUrl(bstrURL, punkSite, pdwZoneID);
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SysFreeString(bstrURL);
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}
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pHtmlDoc->Release();
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}
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}
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return hr;
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}
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