710 lines
19 KiB
C++
710 lines
19 KiB
C++
/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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EmulateCDFS.cpp
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Abstract:
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Removes read only attributes from CD directories: just like Win9x.
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This shim has gone through several revisions. Originally it was thought
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that win9x simply ignored the ReadOnly, DesiredAccess and ShareMode
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parameters, but after some testing, it turns out that this is only true
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for the CDRom drive.
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Unfortunately we have to check every file to see if it's on the CD first,
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just in case someone opens with exclusive access and then tries to open
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again.
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Notes:
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This is a general purpose shim.
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History:
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01/03/2000 a-jamd Created
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12/02/2000 linstev Separated into 2 shims: RemoveReadOnlyAttribute and this one
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Added CreateFile hooks
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--*/
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#include "precomp.h"
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#include "CharVector.h"
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IMPLEMENT_SHIM_BEGIN(EmulateCDFS)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(OpenFile)
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APIHOOK_ENUM_ENTRY(CreateFileA)
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APIHOOK_ENUM_ENTRY(CreateFileW)
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APIHOOK_ENUM_ENTRY(CreateFileMappingA)
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APIHOOK_ENUM_ENTRY(MapViewOfFile)
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APIHOOK_ENUM_ENTRY(MapViewOfFileEx)
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APIHOOK_ENUM_ENTRY(DuplicateHandle)
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APIHOOK_ENUM_ENTRY(CloseHandle)
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APIHOOK_ENUM_ENTRY(GetFileAttributesW)
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APIHOOK_ENUM_ENTRY(GetFileAttributesA)
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APIHOOK_ENUM_ENTRY(FindFirstFileW)
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APIHOOK_ENUM_ENTRY(FindFirstFileA)
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APIHOOK_ENUM_ENTRY(FindNextFileW)
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APIHOOK_ENUM_ENTRY(FindNextFileA)
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APIHOOK_ENUM_ENTRY(GetFileInformationByHandle)
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APIHOOK_ENUM_ENTRY(GetDiskFreeSpaceA)
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APIHOOK_ENUM_END
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typedef struct _FINDFILE_HANDLE
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{
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HANDLE DirectoryHandle;
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PVOID FindBufferBase;
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PVOID FindBufferNext;
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ULONG FindBufferLength;
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ULONG FindBufferValidLength;
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RTL_CRITICAL_SECTION FindBufferLock;
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} FINDFILE_HANDLE, *PFINDFILE_HANDLE;
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class RO_FileMappingList
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{
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private:
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VectorT<HANDLE> hROHandles; // File mapping handles that we have forced to Read only
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mutable CRITICAL_SECTION critSec;
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inline int GetIndex(HANDLE handle) const;
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public:
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RO_FileMappingList();
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~RO_FileMappingList();
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void Add(HANDLE roHandle);
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void Remove(HANDLE roHandle);
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BOOL Exist(HANDLE handle) const;
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};
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RO_FileMappingList::RO_FileMappingList()
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{
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InitializeCriticalSection(&critSec);
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}
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RO_FileMappingList::~RO_FileMappingList()
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{
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DeleteCriticalSection(&critSec);
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}
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void RO_FileMappingList::Add(HANDLE roHandle)
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{
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if (roHandle != NULL)
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{
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EnterCriticalSection(&critSec);
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int index = GetIndex(roHandle);
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if (index == -1) // not found
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{
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DPFN(eDbgLevelSpew, "[RO_FileMappingList::Add] Handle 0x%08x", roHandle);
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hROHandles.Append(roHandle);
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}
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LeaveCriticalSection(&critSec);
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}
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}
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void RO_FileMappingList::Remove(HANDLE roHandle)
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{
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if (roHandle != NULL)
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{
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EnterCriticalSection(&critSec);
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int index = GetIndex(roHandle);
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if (index >= 0) // found it
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{
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DPFN(eDbgLevelSpew, "[RO_FileMappingList::Remove] Handle 0x%08x", roHandle);
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hROHandles.Remove(index);
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}
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LeaveCriticalSection(&critSec);
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}
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}
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inline int RO_FileMappingList::GetIndex(HANDLE handle) const
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{
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int index = hROHandles.Find(handle);
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return index;
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}
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BOOL RO_FileMappingList::Exist(HANDLE handle) const
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{
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EnterCriticalSection(&critSec);
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BOOL bExist = GetIndex(handle) >= 0;
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LeaveCriticalSection(&critSec);
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return bExist;
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}
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// A global list of file mapping handles that we have forced to readonly
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RO_FileMappingList *g_RO_Handles = NULL;
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/*++
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Remove write attributes for read-only devices.
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--*/
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HFILE
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APIHOOK(OpenFile)(
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LPCSTR lpFileName, // file name
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LPOFSTRUCT lpReOpenBuff, // file information
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UINT uStyle // action and attributes
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)
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{
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if ((uStyle & OF_READWRITE) && IsOnCDRomA(lpFileName))
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{
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// Remove the Read/Write bits
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uStyle &= ~OF_READWRITE;
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uStyle |= OF_READ;
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LOGN(eDbgLevelInfo, "[OpenFile] \"%s\": attributes modified for read-only device", lpFileName);
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}
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HFILE returnValue = ORIGINAL_API(OpenFile)(lpFileName, lpReOpenBuff, uStyle);
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return returnValue;
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}
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/*++
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Remove write attributes for read-only devices.
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--*/
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HANDLE
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APIHOOK(CreateFileA)(
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LPSTR lpFileName,
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DWORD dwDesiredAccess,
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DWORD dwShareMode,
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LPSECURITY_ATTRIBUTES lpSecurityAttributes,
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DWORD dwCreationDisposition,
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DWORD dwFlagsAndAttributes,
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HANDLE hTemplateFile
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)
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{
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if (((dwCreationDisposition == OPEN_EXISTING) ||
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(dwCreationDisposition == OPEN_ALWAYS)) &&
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((dwDesiredAccess & GENERIC_WRITE) ||
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(dwShareMode != FILE_SHARE_READ)) &&
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IsOnCDRomA(lpFileName))
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{
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dwDesiredAccess &= ~GENERIC_WRITE;
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dwShareMode = FILE_SHARE_READ;
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LOGN(eDbgLevelInfo, "[CreateFileA] \"%s\": attributes modified for read-only device", lpFileName);
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}
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if (dwFlagsAndAttributes & FILE_FLAG_NO_BUFFERING)
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{
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dwFlagsAndAttributes &= ~FILE_FLAG_NO_BUFFERING;
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LOGN(eDbgLevelInfo, "[CreateFileA] \"%s\": removed NO_BUFFERING flag", lpFileName);
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}
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HANDLE hRet = ORIGINAL_API(CreateFileA)(
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lpFileName,
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dwDesiredAccess,
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dwShareMode,
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lpSecurityAttributes,
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dwCreationDisposition,
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dwFlagsAndAttributes,
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hTemplateFile);
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DPFN(eDbgLevelSpew,
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"[CreateFileA] -File: \"%s\" -GENERIC_WRITE:%c -FILE_SHARE_WRITE:%c%s",
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lpFileName,
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(dwDesiredAccess & GENERIC_WRITE) ? 'Y' : 'N',
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(dwShareMode & FILE_SHARE_WRITE) ? 'Y' : 'N',
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(hRet == INVALID_HANDLE_VALUE) ? "\n\t***********Failed***********" : "");
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return hRet;
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}
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/*++
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Remove write attributes for read-only devices.
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--*/
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HANDLE
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APIHOOK(CreateFileW)(
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LPWSTR lpFileName,
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DWORD dwDesiredAccess,
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DWORD dwShareMode,
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LPSECURITY_ATTRIBUTES lpSecurityAttributes,
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DWORD dwCreationDisposition,
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DWORD dwFlagsAndAttributes,
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HANDLE hTemplateFile
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)
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{
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if (((dwCreationDisposition == OPEN_EXISTING) ||
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(dwCreationDisposition == OPEN_ALWAYS)) &&
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((dwDesiredAccess & GENERIC_WRITE) ||
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(dwShareMode != FILE_SHARE_READ)) &&
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IsOnCDRomW(lpFileName))
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{
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dwDesiredAccess &= ~GENERIC_WRITE;
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dwShareMode = FILE_SHARE_READ;
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LOGN(eDbgLevelError, "[CreateFileW] \"%S\": attributes modified for read-only device", lpFileName);
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}
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if (dwFlagsAndAttributes & FILE_FLAG_NO_BUFFERING)
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{
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dwFlagsAndAttributes &= ~FILE_FLAG_NO_BUFFERING;
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LOGN(eDbgLevelInfo, "[CreateFileW] \"%S\": removed NO_BUFFERING flag", lpFileName);
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}
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HANDLE hRet = ORIGINAL_API(CreateFileW)(
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lpFileName,
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dwDesiredAccess,
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dwShareMode,
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lpSecurityAttributes,
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dwCreationDisposition,
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dwFlagsAndAttributes,
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hTemplateFile);
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DPFN(eDbgLevelSpew,
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"[CreateFileW] -File: \"%S\" -GENERIC_WRITE:%c -FILE_SHARE_WRITE:%c%s",
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lpFileName,
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(dwDesiredAccess & GENERIC_WRITE) ? 'Y' : 'N',
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(dwShareMode & FILE_SHARE_WRITE) ? 'Y' : 'N',
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(hRet == INVALID_HANDLE_VALUE) ? "\n\t***********Failed***********" : "");
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return hRet;
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}
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HANDLE
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APIHOOK(CreateFileMappingA)(
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HANDLE hFile, // handle to file
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LPSECURITY_ATTRIBUTES lpAttributes, // security
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DWORD flProtect, // protection
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DWORD dwMaximumSizeHigh, // high-order DWORD of size
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DWORD dwMaximumSizeLow, // low-order DWORD of size
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LPCSTR lpName // object name
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)
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{
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BOOL bChangedProtect = FALSE;
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if (!(flProtect & PAGE_READONLY) && IsOnCDRom(hFile))
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{
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// This handle is on a CD-ROM, force the protection to READONLY
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flProtect = PAGE_READONLY;
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bChangedProtect = TRUE;
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LOGN(eDbgLevelError, "[CreateFileMappingA] Handle 0x%08x: attributes modified for read-only device", hFile);
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}
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HANDLE hRet = ORIGINAL_API(CreateFileMappingA)(
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hFile,
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lpAttributes,
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flProtect,
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dwMaximumSizeHigh,
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dwMaximumSizeLow,
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lpName);
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// If the handle is on a CD-ROM, rember it
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if (bChangedProtect)
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{
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g_RO_Handles->Add(hRet);
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}
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DPFN(eDbgLevelSpew,
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"[CreateFileMappingA] Handle 0x%08x -PAGE_READWRITE:%c -PAGE_WRITECOPY:%c%s",
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lpName,
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(flProtect & PAGE_READWRITE) ? 'Y' : 'N',
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(flProtect & PAGE_WRITECOPY) ? 'Y' : 'N',
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(hRet == INVALID_HANDLE_VALUE) ? "\n\t***********Failed***********" : "");
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return hRet;
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}
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LPVOID
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APIHOOK(MapViewOfFile)(
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HANDLE hFileMappingObject, // handle to file-mapping object
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DWORD dwDesiredAccess, // access mode
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DWORD dwFileOffsetHigh, // high-order DWORD of offset
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DWORD dwFileOffsetLow, // low-order DWORD of offset
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SIZE_T dwNumberOfBytesToMap // number of bytes to map
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)
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{
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//
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// Check to see if we need to force Read access for CD-ROM files
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// Only the FILE_MAP_READ bit may be enabled for CD-ROM access
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//
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if ((dwDesiredAccess != FILE_MAP_READ) &&
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g_RO_Handles->Exist(hFileMappingObject))
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{
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dwDesiredAccess = FILE_MAP_READ;
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LOGN(eDbgLevelError, "[MapViewOfFile] Handle 0x%08x: attributes modified for read-only device", hFileMappingObject);
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}
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HANDLE hRet = ORIGINAL_API(MapViewOfFile)(
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hFileMappingObject,
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dwDesiredAccess,
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dwFileOffsetHigh,
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dwFileOffsetLow,
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dwNumberOfBytesToMap);
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return hRet;
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}
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LPVOID
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APIHOOK(MapViewOfFileEx)(
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HANDLE hFileMappingObject, // handle to file-mapping object
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DWORD dwDesiredAccess, // access mode
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DWORD dwFileOffsetHigh, // high-order DWORD of offset
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DWORD dwFileOffsetLow, // low-order DWORD of offset
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SIZE_T dwNumberOfBytesToMap, // number of bytes to map
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LPVOID lpBaseAddress // starting addres
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)
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{
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//
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// Check to see if we need to force Read access for CD-ROM files
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// Only the FILE_MAP_READ bit may be enabled for CD-ROM access
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//
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if ((dwDesiredAccess != FILE_MAP_READ) &&
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g_RO_Handles->Exist(hFileMappingObject))
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{
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dwDesiredAccess = FILE_MAP_READ;
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LOGN(eDbgLevelError,
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"[MapViewOfFile] Handle 0x%08x: attributes modified for read-only device", hFileMappingObject);
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}
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HANDLE hRet = ORIGINAL_API(MapViewOfFileEx)(
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hFileMappingObject,
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dwDesiredAccess,
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dwFileOffsetHigh,
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dwFileOffsetLow,
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dwNumberOfBytesToMap,
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lpBaseAddress);
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return hRet;
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}
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/*++
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If hSourceHandle has been mucked with, add the duplicated handle to our list
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--*/
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BOOL
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APIHOOK(DuplicateHandle)(
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HANDLE hSourceProcessHandle, // handle to source process
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HANDLE hSourceHandle, // handle to duplicate
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HANDLE hTargetProcessHandle, // handle to target process
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LPHANDLE lpTargetHandle, // duplicate handle
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DWORD dwDesiredAccess, // requested access
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BOOL bInheritHandle, // handle inheritance option
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DWORD dwOptions // optional actions
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)
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{
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BOOL retval = ORIGINAL_API(DuplicateHandle)(
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hSourceProcessHandle,
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hSourceHandle,
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hTargetProcessHandle,
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lpTargetHandle,
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dwDesiredAccess,
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bInheritHandle,
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dwOptions);
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if (retval && g_RO_Handles->Exist(hSourceHandle))
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{
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g_RO_Handles->Add(hTargetProcessHandle);
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}
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return retval;
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}
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/*++
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If hObject has been mucked with, remove it from the list.
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--*/
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BOOL
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APIHOOK(CloseHandle)(
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HANDLE hObject // handle to object
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)
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{
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g_RO_Handles->Remove(hObject);
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return ORIGINAL_API(CloseHandle)(hObject);
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}
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/*++
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Remove read only attribute if it's a directory
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--*/
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DWORD
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APIHOOK(GetFileAttributesA)(LPCSTR lpFileName)
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{
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DWORD dwFileAttributes = ORIGINAL_API(GetFileAttributesA)(lpFileName);
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// Check for READONLY and DIRECTORY attributes
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if ((dwFileAttributes != INT_PTR(-1)) &&
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(dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) &&
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(dwFileAttributes & FILE_ATTRIBUTE_READONLY) &&
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IsOnCDRomA(lpFileName))
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{
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// Flip the read-only bit.
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LOGN(eDbgLevelWarning, "[GetFileAttributesA] Removing FILE_ATTRIBUTE_READONLY");
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dwFileAttributes ^= FILE_ATTRIBUTE_READONLY;
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}
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return dwFileAttributes;
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}
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/*++
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Remove read only attribute if it's a directory
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--*/
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DWORD
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APIHOOK(GetFileAttributesW)(LPCWSTR wcsFileName)
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{
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DWORD dwFileAttributes = ORIGINAL_API(GetFileAttributesW)(wcsFileName);
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// Check for READONLY and DIRECTORY attributes
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if ((dwFileAttributes != INT_PTR(-1)) &&
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(dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) &&
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(dwFileAttributes & FILE_ATTRIBUTE_READONLY) &&
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IsOnCDRomW(wcsFileName))
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{
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// Flip the read-only bit.
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LOGN(eDbgLevelWarning, "[GetFileAttributesW] Removing FILE_ATTRIBUTE_READONLY");
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dwFileAttributes ^= FILE_ATTRIBUTE_READONLY;
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}
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return dwFileAttributes;
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}
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/*++
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Remove read only attribute if it's a directory
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--*/
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HANDLE
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APIHOOK(FindFirstFileA)(
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LPCSTR lpFileName,
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LPWIN32_FIND_DATAA lpFindFileData
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)
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{
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HANDLE hFindFile = ORIGINAL_API(FindFirstFileA)(lpFileName, lpFindFileData);
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if ((hFindFile != INVALID_HANDLE_VALUE) &&
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(lpFindFileData->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) &&
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(lpFindFileData->dwFileAttributes & FILE_ATTRIBUTE_READONLY) &&
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IsOnCDRom(((PFINDFILE_HANDLE) hFindFile)->DirectoryHandle))
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{
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// Flip the read-only bit
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LOGN(eDbgLevelWarning, "[FindFirstFileA] Removing FILE_ATTRIBUTE_READONLY");
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lpFindFileData->dwFileAttributes ^= FILE_ATTRIBUTE_READONLY;
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}
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return hFindFile;
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}
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/*++
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Remove read only attribute if it's a directory.
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--*/
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HANDLE
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APIHOOK(FindFirstFileW)(
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LPCWSTR wcsFileName,
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LPWIN32_FIND_DATAW lpFindFileData
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)
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{
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HANDLE hFindFile = ORIGINAL_API(FindFirstFileW)(wcsFileName, lpFindFileData);
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if ((hFindFile != INVALID_HANDLE_VALUE) &&
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(lpFindFileData->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) &&
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(lpFindFileData->dwFileAttributes & FILE_ATTRIBUTE_READONLY) &&
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IsOnCDRom(((PFINDFILE_HANDLE) hFindFile)->DirectoryHandle))
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{
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// It's a directory: flip the read-only bit
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LOGN(eDbgLevelInfo, "[FindFirstFileW] Removing FILE_ATTRIBUTE_READONLY");
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lpFindFileData->dwFileAttributes ^= FILE_ATTRIBUTE_READONLY;
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}
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return hFindFile;
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}
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/*++
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Remove read only attribute if it's a directory.
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--*/
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BOOL
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APIHOOK(FindNextFileA)(
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HANDLE hFindFile,
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LPWIN32_FIND_DATAA lpFindFileData
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)
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{
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BOOL bRet = ORIGINAL_API(FindNextFileA)(hFindFile, lpFindFileData);
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if (bRet &&
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(lpFindFileData->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) &&
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(lpFindFileData->dwFileAttributes & FILE_ATTRIBUTE_READONLY) &&
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IsOnCDRom(((PFINDFILE_HANDLE) hFindFile)->DirectoryHandle))
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{
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// Flip the read-only bit.
|
|
LOGN(eDbgLevelWarning, "[FindNextFileA] Removing FILE_ATTRIBUTE_READONLY");
|
|
lpFindFileData->dwFileAttributes ^= FILE_ATTRIBUTE_READONLY;
|
|
}
|
|
|
|
return bRet;
|
|
}
|
|
|
|
/*++
|
|
|
|
Remove read only attribute if it's a directory.
|
|
|
|
--*/
|
|
|
|
BOOL
|
|
APIHOOK(FindNextFileW)(
|
|
HANDLE hFindFile,
|
|
LPWIN32_FIND_DATAW lpFindFileData
|
|
)
|
|
{
|
|
BOOL bRet = ORIGINAL_API(FindNextFileW)(hFindFile, lpFindFileData);
|
|
|
|
if (bRet &&
|
|
(lpFindFileData->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) &&
|
|
(lpFindFileData->dwFileAttributes & FILE_ATTRIBUTE_READONLY) &&
|
|
IsOnCDRom(((PFINDFILE_HANDLE) hFindFile)->DirectoryHandle))
|
|
{
|
|
// Flip the read-only bit
|
|
LOGN(eDbgLevelWarning, "[FindNextFileW] Removing FILE_ATTRIBUTE_READONLY");
|
|
lpFindFileData->dwFileAttributes ^= FILE_ATTRIBUTE_READONLY;
|
|
}
|
|
|
|
return bRet;
|
|
}
|
|
|
|
/*++
|
|
|
|
Remove read only attribute if it's a directory.
|
|
|
|
--*/
|
|
|
|
BOOL
|
|
APIHOOK(GetFileInformationByHandle)(
|
|
HANDLE hFile,
|
|
LPBY_HANDLE_FILE_INFORMATION lpFileInformation
|
|
)
|
|
{
|
|
BOOL bRet = ORIGINAL_API(GetFileInformationByHandle)(hFile, lpFileInformation);
|
|
|
|
if (bRet &&
|
|
(lpFileInformation->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) &&
|
|
(lpFileInformation->dwFileAttributes & FILE_ATTRIBUTE_READONLY) &&
|
|
IsOnCDRom(hFile))
|
|
{
|
|
// It's a CDROM: flip the read-only bit.
|
|
LOGN(eDbgLevelWarning, "[GetFileInformationByHandle] Removing FILE_ATTRIBUTE_READONLY");
|
|
lpFileInformation->dwFileAttributes ^= FILE_ATTRIBUTE_READONLY;
|
|
}
|
|
|
|
return bRet;
|
|
}
|
|
|
|
/*++
|
|
|
|
If the disk is a CDROM, return the same wrong numbers as Win9x
|
|
|
|
--*/
|
|
|
|
BOOL
|
|
APIHOOK(GetDiskFreeSpaceA)(
|
|
LPCSTR lpRootPathName,
|
|
LPDWORD lpSectorsPerCluster,
|
|
LPDWORD lpBytesPerSector,
|
|
LPDWORD lpNumberOfFreeClusters,
|
|
LPDWORD lpTotalNumberOfClusters
|
|
)
|
|
{
|
|
if (IsOnCDRomA(lpRootPathName))
|
|
{
|
|
// Hard code values to match Win9x (wrong) description of CDROM
|
|
*lpSectorsPerCluster = 0x10;
|
|
*lpBytesPerSector = 0x800;
|
|
*lpNumberOfFreeClusters = 0;
|
|
*lpTotalNumberOfClusters = 0x2b7;
|
|
|
|
return TRUE;
|
|
}
|
|
else
|
|
{
|
|
// Call the original API
|
|
BOOL lRet = ORIGINAL_API(GetDiskFreeSpaceA)(
|
|
lpRootPathName,
|
|
lpSectorsPerCluster,
|
|
lpBytesPerSector,
|
|
lpNumberOfFreeClusters,
|
|
lpTotalNumberOfClusters);
|
|
|
|
return lRet;
|
|
}
|
|
}
|
|
|
|
/*++
|
|
|
|
Initialize all the registry hooks
|
|
|
|
--*/
|
|
|
|
BOOL
|
|
NOTIFY_FUNCTION(
|
|
DWORD fdwReason
|
|
)
|
|
{
|
|
if (fdwReason == DLL_PROCESS_ATTACH)
|
|
{
|
|
// Allocate our structure, if it fails, bail on the shim
|
|
g_RO_Handles = new RO_FileMappingList;
|
|
}
|
|
return g_RO_Handles != NULL;
|
|
}
|
|
|
|
/*++
|
|
|
|
Register hooked functions
|
|
|
|
--*/
|
|
|
|
HOOK_BEGIN
|
|
|
|
CALL_NOTIFY_FUNCTION
|
|
|
|
APIHOOK_ENTRY(KERNEL32.DLL, OpenFile)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, CreateFileA)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, CreateFileW)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, CreateFileMappingA)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, MapViewOfFile)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, MapViewOfFileEx)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, DuplicateHandle)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, CloseHandle)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, GetFileAttributesA)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, GetFileAttributesW)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, FindFirstFileA)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, FindFirstFileW)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, FindNextFileA)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, FindNextFileW)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, GetFileInformationByHandle)
|
|
APIHOOK_ENTRY(KERNEL32.DLL, GetDiskFreeSpaceA)
|
|
|
|
HOOK_END
|
|
|
|
IMPLEMENT_SHIM_END
|
|
|