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NktHookLib.cpp
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NktHookLib.cpp
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/*
* Copyright (C) 2010-2015 Nektra S.A., Buenos Aires, Argentina.
* All rights reserved. Contact: http://www.nektra.com
*
*
* This file is part of Deviare In-Proc
*
*
* Commercial License Usage
* ------------------------
* Licensees holding valid commercial Deviare In-Proc licenses may use this
* file in accordance with the commercial license agreement provided with the
* Software or, alternatively, in accordance with the terms contained in
* a written agreement between you and Nektra. For licensing terms and
* conditions see http://www.nektra.com/licensing/. For further information
* use the contact form at http://www.nektra.com/contact/.
*
*
* GNU General Public License Usage
* --------------------------------
* Alternatively, this file may be used under the terms of the GNU
* General Public License version 3.0 as published by the Free Software
* Foundation and appearing in the file LICENSE.GPL included in the
* packaging of this file. Please review the following information to
* ensure the GNU General Public License version 3.0 requirements will be
* met: http://www.gnu.org/copyleft/gpl.html.
*
**/
#include <NktHookLib.h>
#include "LinkedList.h"
#include "WaitableObjects.h"
#include "ThreadSuspend.h"
#include "HookEntry.h"
#include "NtHeapBaseObj.h"
#include <intrin.h>
#include "Wow64.h"
using namespace NktHookLib::Internals;
using namespace NktHookLibHelpers;
//-----------------------------------------------------------
#define MAX_SUSPEND_IPRANGES 10
#define MemoryBasicInformation 0
#define X_ARRAYLEN(x) (sizeof(x)/sizeof(x[0]))
#if defined(_M_X64) || defined(_M_IA64) || defined(_M_AMD64)
#define NKT_UNALIGNED __unaligned
#else
#define NKT_UNALIGNED
#endif
#define RETMINISTUBS_COUNT_X86 160
#define RETMINISTUBS_COUNT_X64 120
#define VALID_FLAGS (NKTHOOKLIB_DontSkipInitialJumps | NKTHOOKLIB_DontRemoveOnUnhook | \
NKTHOOKLIB_DontSkipAnyJumps | NKTHOOKLIB_SkipNullProcsToHook | \
NKTHOOKLIB_UseAbsoluteIndirectJumps | NKTHOOKLIB_DisallowReentrancy | \
NKTHOOKLIB_DontEnableHooks)
#define INTERNALFLAG_CallToOriginalIsPtr2Ptr 0x80000000
#define INTERNALFLAG_HookInfoArrayIsPtr 0x40000000
#define FlagOn(x, _flag) ((x) & (_flag))
//-----------------------------------------------------------
static DWORD GetProcessIdFromHandle(__in HANDLE hProc);
//-----------------------------------------------------------
namespace NktHookLib {
namespace Internals {
class CInternals : public CNktNtHeapBaseObj
{
public:
CInternals()
{
sOptions.bSuspendThreads = TRUE;
#ifdef _DEBUG
sOptions.bOutputDebug = TRUE;
#else _DEBUG
sOptions.bOutputDebug = FALSE;
#endif //_DEBUG
return;
};
private:
friend class CNktHookLib;
TNktLnkLst<CHookEntry> cHooksList;
CNktThreadSuspend cThreadSuspender;
CNktFastMutex cMtx;
CProcessesHandles cProcHdrMgr;
struct {
BOOL bSuspendThreads;
BOOL bOutputDebug;
BOOL bSkipJumps;
} sOptions;
};
} //Internals
} //NktHookLib
#define int_data ((CInternals*)lpInternals)
//-----------------------------------------------------------
CNktHookLib::CNktHookLib()
{
lpInternals = new CInternals();
return;
}
CNktHookLib::~CNktHookLib()
{
if (lpInternals != NULL)
{
UnhookAll();
delete int_data;
lpInternals = NULL;
}
return;
}
DWORD CNktHookLib::Hook(__out SIZE_T *lpnHookId, __out LPVOID *lplpCallOriginal, __in LPVOID lpProcToHook,
__in LPVOID lpNewProcAddr, __in DWORD dwFlags)
{
HOOK_INFO sHook;
DWORD dwOsErr;
if (lpnHookId != NULL)
*lpnHookId = 0;
if (lplpCallOriginal != NULL)
*lplpCallOriginal = NULL;
if (lpnHookId == NULL || lplpCallOriginal == NULL)
return ERROR_INVALID_PARAMETER;
sHook.lpProcToHook = lpProcToHook;
sHook.lpNewProcAddr = lpNewProcAddr;
sHook.lpCallOriginal = (LPVOID)lplpCallOriginal;
dwOsErr = HookCommon(&sHook, 1, NktHookLibHelpers::GetCurrentProcessId(),
(dwFlags & VALID_FLAGS) | INTERNALFLAG_CallToOriginalIsPtr2Ptr);
if (dwOsErr == ERROR_SUCCESS)
{
*lpnHookId = sHook.nHookId;
}
return dwOsErr;
}
DWORD CNktHookLib::Hook(__inout HOOK_INFO aHookInfo[], __in SIZE_T nCount, __in DWORD dwFlags)
{
return HookCommon(aHookInfo, nCount, NktHookLibHelpers::GetCurrentProcessId(), dwFlags & VALID_FLAGS);
}
DWORD CNktHookLib::Hook(__inout LPHOOK_INFO aHookInfo[], __in SIZE_T nCount, __in DWORD dwFlags)
{
return HookCommon(aHookInfo, nCount, NktHookLibHelpers::GetCurrentProcessId(),
(dwFlags & VALID_FLAGS) | INTERNALFLAG_HookInfoArrayIsPtr);
}
DWORD CNktHookLib::RemoteHook(__out SIZE_T *lpnHookId, __out LPVOID *lplpCallOriginal, __in DWORD dwPid,
__in LPVOID lpProcToHook, __in LPVOID lpNewProcAddr, __in DWORD dwFlags)
{
HOOK_INFO sHook;
DWORD dwOsErr;
if (lpnHookId != NULL)
*lpnHookId = 0;
if (lplpCallOriginal != NULL)
*lplpCallOriginal = NULL;
if (lpnHookId == NULL || lplpCallOriginal == NULL)
return ERROR_INVALID_PARAMETER;
sHook.lpProcToHook = lpProcToHook;
sHook.lpNewProcAddr = lpNewProcAddr;
sHook.lpCallOriginal = (LPVOID)lplpCallOriginal;
dwOsErr = HookCommon(&sHook, 1, dwPid, (dwFlags & VALID_FLAGS) | INTERNALFLAG_CallToOriginalIsPtr2Ptr);
if (dwOsErr == ERROR_SUCCESS)
*lpnHookId = sHook.nHookId;
return dwOsErr;
}
DWORD CNktHookLib::RemoteHook(__inout HOOK_INFO aHookInfo[], __in SIZE_T nCount, __in DWORD dwPid, __in DWORD dwFlags)
{
return HookCommon(aHookInfo, nCount, dwPid, dwFlags & VALID_FLAGS);
}
DWORD CNktHookLib::RemoteHook(__inout LPHOOK_INFO aHookInfo[], __in SIZE_T nCount, __in DWORD dwPid, __in DWORD dwFlags)
{
return HookCommon(aHookInfo, nCount, dwPid, (dwFlags & VALID_FLAGS) | INTERNALFLAG_CallToOriginalIsPtr2Ptr);
}
DWORD CNktHookLib::RemoteHook(__out SIZE_T *lpnHookId, __out LPVOID *lplpCallOriginal, __in HANDLE hProcess,
__in LPVOID lpProcToHook, __in LPVOID lpNewProcAddr, __in DWORD dwFlags)
{
HOOK_INFO sHook;
DWORD dwOsErr, dwPid;
if (lpnHookId != NULL)
*lpnHookId = 0;
if (lplpCallOriginal != NULL)
*lplpCallOriginal = NULL;
if (lpnHookId == NULL || lplpCallOriginal == NULL || hProcess == NULL)
return ERROR_INVALID_PARAMETER;
dwPid = GetProcessIdFromHandle(hProcess);
if (dwPid == 0)
return ERROR_INVALID_PARAMETER;
sHook.lpProcToHook = lpProcToHook;
sHook.lpNewProcAddr = lpNewProcAddr;
sHook.lpCallOriginal = (LPVOID)lplpCallOriginal;
dwOsErr = HookCommon(&sHook, 1, dwPid, (dwFlags & VALID_FLAGS) | INTERNALFLAG_CallToOriginalIsPtr2Ptr);
if (dwOsErr == ERROR_SUCCESS)
*lpnHookId = sHook.nHookId;
return dwOsErr;
}
DWORD CNktHookLib::RemoteHook(__inout HOOK_INFO aHookInfo[], __in SIZE_T nCount, __in HANDLE hProcess,
__in DWORD dwFlags)
{
DWORD dwPid;
SIZE_T nHookIdx;
dwPid = GetProcessIdFromHandle(hProcess);
if (dwPid == 0)
{
for (nHookIdx=0; nHookIdx<nCount; nHookIdx++)
{
aHookInfo[nHookIdx].nHookId = 0;
if (aHookInfo[nHookIdx].lpCallOriginal != NULL)
aHookInfo[nHookIdx].lpCallOriginal = NULL;
}
return ERROR_INVALID_PARAMETER;
}
return HookCommon(aHookInfo, nCount, dwPid, dwFlags & VALID_FLAGS);
}
DWORD CNktHookLib::RemoteHook(__inout LPHOOK_INFO aHookInfo[], __in SIZE_T nCount, __in HANDLE hProcess,
__in DWORD dwFlags)
{
DWORD dwPid;
SIZE_T nHookIdx;
dwPid = GetProcessIdFromHandle(hProcess);
if (dwPid == 0)
{
for (nHookIdx = 0; nHookIdx<nCount; nHookIdx++)
{
aHookInfo[nHookIdx]->nHookId = 0;
if (aHookInfo[nHookIdx]->lpCallOriginal != NULL)
aHookInfo[nHookIdx]->lpCallOriginal = NULL;
}
return ERROR_INVALID_PARAMETER;
}
return HookCommon(aHookInfo, nCount, dwPid, (dwFlags & VALID_FLAGS) | INTERNALFLAG_CallToOriginalIsPtr2Ptr);
}
DWORD CNktHookLib::Unhook(__in SIZE_T nHookId)
{
HOOK_INFO sHook;
sHook.nHookId = nHookId;
return Unhook(&sHook, 1);
}
DWORD CNktHookLib::Unhook(__in HOOK_INFO aHookInfo[], __in SIZE_T nCount)
{
return UnhookCommon(aHookInfo, nCount, 0);
}
DWORD CNktHookLib::Unhook(__in LPHOOK_INFO aHookInfo[], __in SIZE_T nCount)
{
return UnhookCommon(aHookInfo, nCount, INTERNALFLAG_CallToOriginalIsPtr2Ptr);
}
VOID CNktHookLib::UnhookProcess(__in DWORD dwPid)
{
if (lpInternals != NULL)
{
CNktAutoFastMutex cAutoLock(&(int_data->cMtx));
TNktLnkLst<CHookEntry>::Iterator it;
CHookEntry *lpHookEntry;
HOOK_INFO sHooks[256];
SIZE_T nCount;
if (dwPid == 0)
dwPid = NktHookLibHelpers::GetCurrentProcessId();
do
{
nCount = 0;
for (lpHookEntry=it.Begin(int_data->cHooksList); lpHookEntry!=NULL && nCount<X_ARRAYLEN(sHooks);
lpHookEntry=it.Next())
{
if (lpHookEntry->cProcEntry->GetPid() == dwPid)
sHooks[nCount++].nHookId = lpHookEntry->nId;
}
if (nCount > 0)
Unhook(sHooks, nCount);
}
while (nCount > 0);
}
return;
}
VOID CNktHookLib::UnhookAll()
{
if (lpInternals != NULL)
{
CNktAutoFastMutex cAutoLock(&(int_data->cMtx));
TNktLnkLst<CHookEntry>::Iterator it;
TNktLnkLst<CHookEntry>::IteratorRev itRev;
CHookEntry *lpHookEntry;
HOOK_INFO sHooks[256];
DWORD dwCurrPid;
SIZE_T nCount;
//mark all hooks as uninstalled first
dwCurrPid = NktHookLibHelpers::GetCurrentProcessId();
for (lpHookEntry=it.Begin(int_data->cHooksList); lpHookEntry!=NULL; lpHookEntry=it.Next())
{
if (lpHookEntry->cProcEntry->GetPid() != dwCurrPid)
{
BYTE nVal = 1;
NktHookLibHelpers::WriteMem(lpHookEntry->cProcEntry, lpHookEntry->lpInjData, &nVal, 1);
}
else
{
_InterlockedOr((LONG volatile *)(lpHookEntry->lpInjData), 0x00000001);
}
lpHookEntry->nInstalledCode = 3;
}
//unhook in reverse order
while (int_data->cHooksList.IsEmpty() == FALSE)
{
for (nCount=0,lpHookEntry=itRev.Begin(int_data->cHooksList); lpHookEntry!=NULL && nCount<X_ARRAYLEN(sHooks);
lpHookEntry=itRev.Next())
sHooks[nCount++].nHookId = lpHookEntry->nId;
if (nCount > 0)
Unhook(sHooks, nCount);
}
}
return;
}
DWORD CNktHookLib::RemoveHook(__in SIZE_T nHookId, BOOL bDisable)
{
HOOK_INFO sHook;
sHook.nHookId = nHookId;
return RemoveHook(&sHook, 1, bDisable);
}
DWORD CNktHookLib::RemoveHook(__in HOOK_INFO aHookInfo[], __in SIZE_T nCount, BOOL bDisable)
{
return RemoveHookCommon(aHookInfo, nCount, bDisable, 0);
}
DWORD CNktHookLib::RemoveHook(__in LPHOOK_INFO aHookInfo[], __in SIZE_T nCount, BOOL bDisable)
{
return RemoveHookCommon(aHookInfo, nCount, bDisable, INTERNALFLAG_CallToOriginalIsPtr2Ptr);
}
DWORD CNktHookLib::EnableHook(__in SIZE_T nHookId, __in BOOL bEnable)
{
HOOK_INFO sHook;
sHook.nHookId = nHookId;
return EnableHook(&sHook, 1, bEnable);
}
DWORD CNktHookLib::EnableHook(__in HOOK_INFO aHookInfo[], __in SIZE_T nCount, __in BOOL bEnable)
{
return EnableHookCommon(aHookInfo, nCount, bEnable, 0);
}
DWORD CNktHookLib::EnableHook(__in LPHOOK_INFO aHookInfo[], __in SIZE_T nCount, __in BOOL bEnable)
{
return EnableHookCommon(aHookInfo, nCount, bEnable, INTERNALFLAG_CallToOriginalIsPtr2Ptr);
}
DWORD CNktHookLib::SetSuspendThreadsWhileHooking(__in BOOL bEnable)
{
if (lpInternals == NULL)
return ERROR_NOT_ENOUGH_MEMORY;
{
CNktAutoFastMutex cAutoLock(&(int_data->cMtx));
int_data->sOptions.bSuspendThreads = bEnable;
}
return ERROR_SUCCESS;
}
BOOL CNktHookLib::GetSuspendThreadsWhileHooking()
{
BOOL b;
b = TRUE;
if (lpInternals != NULL)
{
CNktAutoFastMutex cAutoLock(&(int_data->cMtx));
b = int_data->sOptions.bSuspendThreads;
}
return b;
}
DWORD CNktHookLib::SetEnableDebugOutput(__in BOOL bEnable)
{
if (lpInternals == NULL)
return ERROR_NOT_ENOUGH_MEMORY;
{
CNktAutoFastMutex cAutoLock(&(int_data->cMtx));
int_data->sOptions.bOutputDebug = bEnable;
}
return ERROR_SUCCESS;
}
BOOL CNktHookLib::GetEnableDebugOutput()
{
BOOL b;
b = TRUE;
if (lpInternals != NULL)
{
CNktAutoFastMutex cAutoLock(&(int_data->cMtx));
b = int_data->sOptions.bOutputDebug;
}
return b;
}
void* __cdecl CNktHookLib::operator new(__in size_t nSize)
{
return NktHookLibHelpers::MemAlloc(nSize);
};
void* __cdecl CNktHookLib::operator new[](__in size_t nSize)
{
return NktHookLibHelpers::MemAlloc(nSize);
};
void* __cdecl CNktHookLib::operator new(__in size_t nSize, __inout void* lpInPlace)
{
return lpInPlace;
};
void __cdecl CNktHookLib::operator delete(__inout void* p)
{
NktHookLibHelpers::MemFree(p);
return;
};
void __cdecl CNktHookLib::operator delete[](__inout void* p)
{
NktHookLibHelpers::MemFree(p);
return;
};
#if _MSC_VER >= 1200
void __cdecl CNktHookLib::operator delete(__inout void* p, __inout void* lpPlace)
{
return;
};
#endif //_MSC_VER >= 1200
DWORD CNktHookLib::HookCommon(__in LPVOID _lpInfo, __in SIZE_T nCount, __in DWORD dwPid, __in DWORD dwFlags)
{
union {
LPHOOK_INFO lpHookInfo;
LPHOOK_INFO *lplpHookInfo;
};
LPHOOK_INFO lpHookInfoItem;
DWORD dwOsErr;
SIZE_T nHookIdx;
BOOL bIsRemoteProcess;
if (_lpInfo == NULL || nCount == 0 || dwPid == 0)
return ERROR_INVALID_PARAMETER;
lpHookInfo = (LPHOOK_INFO)_lpInfo;
for (nHookIdx=0; nHookIdx<nCount; nHookIdx++)
{
lpHookInfoItem = (FlagOn(dwFlags, INTERNALFLAG_HookInfoArrayIsPtr)) ? lplpHookInfo[nHookIdx] :
(lpHookInfo + nHookIdx);
lpHookInfoItem->nHookId = 0;
if (FlagOn(dwFlags, INTERNALFLAG_CallToOriginalIsPtr2Ptr))
{
if (lpHookInfoItem->lpCallOriginal != NULL)
*((LPVOID*)(lpHookInfoItem->lpCallOriginal)) = NULL;
}
else
{
lpHookInfoItem->lpCallOriginal = NULL;
}
}
for (nHookIdx=0; nHookIdx<nCount; nHookIdx++)
{
lpHookInfoItem = (FlagOn(dwFlags, INTERNALFLAG_HookInfoArrayIsPtr)) ? lplpHookInfo[nHookIdx] :
(lpHookInfo + nHookIdx);
if (lpHookInfoItem->lpProcToHook == NULL)
{
if (!FlagOn(dwFlags, NKTHOOKLIB_SkipNullProcsToHook))
return ERROR_INVALID_PARAMETER;
}
else
{
if (lpHookInfoItem->lpNewProcAddr == NULL)
return ERROR_INVALID_PARAMETER;
}
}
bIsRemoteProcess = (dwPid != NktHookLibHelpers::GetCurrentProcessId()) ? TRUE : FALSE;
if (lpInternals != NULL)
{
CNktAutoFastMutex cAutoLock(&(int_data->cMtx));
CProcessesHandles::CEntryPtr cProcEntry;
TNktLnkLst<CHookEntry> cNewHooksList;
CHookEntry *lpHookEntry, *lpFirstHookEntryInRound;
SIZE_T i, k, nSizeOfSizeT, nSize, nThisRound;
LPBYTE p, lpRetStubs[3], lpCallOrigOfs[2], lpTempLoc;
BYTE aCodeBlock[4096];
DWORD dw;
NTSTATUS nNtStatus;
//get process handle
nNtStatus = int_data->cProcHdrMgr.Get(dwPid, &cProcEntry);
if (!NT_SUCCESS(nNtStatus))
return NktRtlNtStatusToDosError(nNtStatus);
//calculate the size of a SIZE_T value
nSizeOfSizeT = 0;
switch (cProcEntry->GetPlatform())
{
case NKTHOOKLIB_ProcessPlatformX86:
nSizeOfSizeT = 4;
break;
#if defined(_M_X64)
case NKTHOOKLIB_ProcessPlatformX64:
nSizeOfSizeT = 8;
break;
#endif //_M_X64
}
//process items
nHookIdx = 0;
dwOsErr = ERROR_SUCCESS;
while (nHookIdx < nCount && dwOsErr == ERROR_SUCCESS)
{
lpHookInfoItem = (FlagOn(dwFlags, INTERNALFLAG_HookInfoArrayIsPtr)) ? lplpHookInfo[nHookIdx] :
(lpHookInfo + nHookIdx);
//skip items with lpProcToHook == NULL
if (lpHookInfoItem->lpProcToHook == NULL)
{
nHookIdx++;
continue;
}
//count items for this round stopping when we find a proc to hook in conflict (two or more hooks on the
//same address)
nThisRound = 1;
while (nHookIdx+nThisRound < nCount)
{
LPHOOK_INFO lpThisRoundHookInfoItem;
lpThisRoundHookInfoItem = (FlagOn(dwFlags, INTERNALFLAG_HookInfoArrayIsPtr)) ?
lplpHookInfo[nHookIdx + nThisRound] : (lpHookInfo + nHookIdx + nThisRound);
if (lpThisRoundHookInfoItem->lpProcToHook == lpHookInfoItem->lpProcToHook ||
lpThisRoundHookInfoItem->lpProcToHook == NULL)
{
break;
}
nThisRound++;
}
//process
lpFirstHookEntryInRound = NULL;
for (k=0; k<nThisRound; k++)
{
lpHookInfoItem = (FlagOn(dwFlags, INTERNALFLAG_HookInfoArrayIsPtr)) ? lplpHookInfo[nHookIdx + k] :
(lpHookInfo + nHookIdx + k);
//create new entries
lpHookEntry = new CHookEntry(cProcEntry, dwFlags);
if (lpHookEntry == NULL)
{
dwOsErr = ERROR_NOT_ENOUGH_MEMORY;
break;
}
if (lpFirstHookEntryInRound == NULL)
lpFirstHookEntryInRound = lpHookEntry;
//add to the new hooks list
cNewHooksList.PushTail(lpHookEntry);
//calculate real proc to hook
lpHookEntry->lpOrigProc = (LPBYTE)(lpHookInfoItem->lpProcToHook);
if (!FlagOn(lpHookEntry->dwFlags, NKTHOOKLIB_DontSkipInitialJumps))
{
lpHookEntry->lpOrigProc = lpHookEntry->SkipJumpInstructions(lpHookEntry->lpOrigProc);
if (lpHookEntry->lpOrigProc == NULL)
{
dwOsErr = ERROR_ACCESS_DENIED;
break;
}
}
lpHookEntry->lpNewProc = (LPBYTE)(lpHookInfoItem->lpNewProcAddr);
//read original stub and create new one
dwOsErr = lpHookEntry->CreateStub(int_data->sOptions.bOutputDebug);
if (dwOsErr != ERROR_SUCCESS)
break;
//allocate memory for inject code in target process
i = FlagOn(lpHookEntry->dwFlags, NKTHOOKLIB_DisallowReentrancy) ? 4096 : 256;
lpHookEntry->lpInjCode = cProcEntry->AllocateMem(lpHookEntry->lpOrigProc, i, FALSE);
if (lpHookEntry->lpInjCode == NULL)
{
dwOsErr = ERROR_NOT_ENOUGH_MEMORY;
break;
}
//allocate memory for inject data in target process
switch (cProcEntry->GetPlatform())
{
case NKTHOOKLIB_ProcessPlatformX86:
i = nSizeOfSizeT + 2 * nSizeOfSizeT * RETMINISTUBS_COUNT_X86;
break;
#if defined(_M_X64)
case NKTHOOKLIB_ProcessPlatformX64:
i = nSizeOfSizeT + 2 * nSizeOfSizeT * RETMINISTUBS_COUNT_X64;
break;
#endif //_M_X64
}
lpHookEntry->lpInjData = cProcEntry->AllocateMem(lpHookEntry->lpOrigProc, i, TRUE);
if (lpHookEntry->lpInjData == NULL)
{
dwOsErr = ERROR_NOT_ENOUGH_MEMORY;
break;
}
//write flags. if current process, hooks are initially disabled to avoid issues when hooking api's
//used by this routine
dw = (bIsRemoteProcess == FALSE || FlagOn(lpHookEntry->dwFlags, NKTHOOKLIB_DontEnableHooks)) ? 0x00000100 : 0;
if (WriteMem(cProcEntry->GetHandle(), lpHookEntry->lpInjData, &dw, sizeof(DWORD)) == FALSE)
{
dwOsErr = ERROR_ACCESS_DENIED;
break;
}
//build new code
p = aCodeBlock;
MemSet(aCodeBlock, 0x90, sizeof(aCodeBlock));
//skip first eight NOP bytes for hot-patching double hooks
p += 8;
//bridge
lpTempLoc = NULL;
lpCallOrigOfs[0] = lpCallOrigOfs[1] = NULL;
lpRetStubs[0] = lpRetStubs[1] = lpRetStubs[2] = NULL;
switch (cProcEntry->GetPlatform())
{
case NKTHOOKLIB_ProcessPlatformX86:
*p++ = 0x52; //push edx
if (FlagOn(lpHookEntry->dwFlags, NKTHOOKLIB_DisallowReentrancy))
{
*p++ = 0x50; //push eax
*p++ = 0x53; //push ebx
*p++ = 0x51; //push ecx
}
//----
*p++ = 0xBA; //mov edx, OFFSET lpInjCode
*((ULONG NKT_UNALIGNED*)p) = (ULONG)(ULONG_PTR)(lpHookEntry->lpInjData);
p += sizeof(ULONG);
//----
*p++ = 0xF7; *p++ = 0x02; //test DWORD PTR [edx], 00000101h
*((ULONG NKT_UNALIGNED*)p) = 0x00000101;
p += sizeof(ULONG);
//----
if (FlagOn(lpHookEntry->dwFlags, NKTHOOKLIB_DisallowReentrancy))
{
*p++ = 0x0F; *p++ = 0x85; //jne FAR CALL_ORIGINAL
lpCallOrigOfs[0] = p;
p += sizeof(ULONG);
}
else
{
*p++ = 0x75; //jne CALL_ORIGINAL
lpCallOrigOfs[0] = p++;
}
//check for reentranct
if (FlagOn(lpHookEntry->dwFlags, NKTHOOKLIB_DisallowReentrancy))
{
*p++ = 0x64; *p++ = 0xA1; //mov eax, fs:[18h]
*((ULONG NKT_UNALIGNED*)p) = 0x18;
p += sizeof(ULONG);
//get thread ID
*p++ = 0x8B; *p++ = 0x40; *p++ = 0x24; //mov eax, DWORD PTR [eax+24h]
//----
*p++ = 0xBA; //mov edx, OFFSET lpReturn
lpRetStubs[0] = p;
p += sizeof(ULONG);
//----
*p++ = 0xB9; //mov ecx, RETMINISTUBS_COUNT_X86
*((ULONG NKT_UNALIGNED*)p) = RETMINISTUBS_COUNT_X86;
p += sizeof(ULONG);
//---- L1:
*p++ = 0x3B; *p++ = 0x02; //cmp eax, DWORD PTR [edx]
//----
*p++ = 0x0F; *p++ = 0x84; //je FAR CALL_ORIGINAL
lpCallOrigOfs[1] = p;
p += sizeof(ULONG);
//----
*p++ = 0x81; *p++ = 0xC2; //add edx, 8h
*((ULONG NKT_UNALIGNED*)p) = 8;
p += sizeof(ULONG);
//----
*p++ = 0xE2; *p++ = 0xF0; //loop L1
//----
*p++ = 0x8B; *p++ = 0xD8; //mov ebx, eax
//----
*p++ = 0xBA; //mov edx, OFFSET lpReturn
lpRetStubs[1] = p;
p += sizeof(ULONG);
//----
*p++ = 0xB9; //mov ecx, RETMINISTUBS_COUNT_X86
*((ULONG NKT_UNALIGNED*)p) = RETMINISTUBS_COUNT_X86;
p += sizeof(ULONG);
//---- L2:
*p++ = 0x33; *p++ = 0xC0; //xor eax, eax
//----
*p++ = 0xF0; *p++ = 0x0F; *p++ = 0xB1; *p++ = 0x1A; //lock cmpxchg DWORD PTR [edx], ebx
//----
*p++ = 0x74; *p++ = 0x0A; //je CHG_RETADDR
//----
*p++ = 0x81; *p++ = 0xC2; //add edx, 8h
*((ULONG NKT_UNALIGNED*)p) = 8;
p += sizeof(ULONG);
//----
*p++ = 0xE2; *p++ = 0xF0; //loop L2
//----
*p++ = 0xEB; //jmp call_hooked
lpTempLoc = p++;
//---- CHG_RETADDR: original return address
*p++ = 0x8B; *p++ = 0x44; *p++ = 0x24; *p++ = 0x10; //mov eax, DWORD PTR [esp+10h]
//----
*p++ = 0x89; *p++ = 0x42; *p++ = 0x04; //mov DWORD PTR [edx+4], eax
//----
*p++ = 0xB8; //mov eax, RETMINISTUBS_COUNT_X86
*((ULONG NKT_UNALIGNED*)p) = RETMINISTUBS_COUNT_X86;
p += sizeof(ULONG);
//----
*p++ = 0x29; *p++ = 0xC8; //sub eax, ecx
//----
*p++ = 0xC1; *p++ = 0xE0; *p++ = 0x04; //shl eax, 4
//----
*p++ = 0x05; //add eax, OFFSET ministub return
lpRetStubs[2] = p;
p += sizeof(ULONG);
//----
*p++ = 0x89; *p++ = 0x44; *p++ = 0x24; *p++ = 0x10; //mov DWORD PTR [esp+10h], eax
//----
*lpTempLoc = (BYTE)(p - lpTempLoc - 1);
*p++ = 0x59; //pop ecx
*p++ = 0x5B; //pop ebx
*p++ = 0x58; //pop eax
}
*p++ = 0x5A; //pop edx
//----
*p++ = 0xE9; //jmp hooked proc
*((ULONG NKT_UNALIGNED*)p) = (ULONG)(ULONG_PTR)(lpHookEntry->lpNewProc) -
((ULONG)(ULONG_PTR)(lpHookEntry->lpInjCode) +
(ULONG)(ULONG_PTR)(p + 4 - aCodeBlock));
p += sizeof(ULONG);
//---- CALL_ORIGINAL:
if (FlagOn(lpHookEntry->dwFlags, NKTHOOKLIB_DisallowReentrancy))
{
*((LPDWORD)(lpCallOrigOfs[0])) = (DWORD)(p - lpCallOrigOfs[0] - 4);
*((LPDWORD)(lpCallOrigOfs[1])) = (DWORD)(p - lpCallOrigOfs[1] - 4);
*p++ = 0x59; //pop ecx
*p++ = 0x5B; //pop ebx
*p++ = 0x58; //pop eax
}
else
{
*lpCallOrigOfs[0] = (BYTE)(p - lpCallOrigOfs[0] - 1);
}
*p++ = 0x5A; //pop edx
lpHookEntry->lpCall2Orig = lpHookEntry->lpInjCode + (SIZE_T)(p-aCodeBlock);
MemCopy(p, lpHookEntry->aNewStub, lpHookEntry->nNewStubSize); //new stub
p += lpHookEntry->nNewStubSize;
//----
*p++ = 0xE9; //jmp original proc after stub
*((ULONG NKT_UNALIGNED*)p) = ((ULONG)(ULONG_PTR)(lpHookEntry->lpOrigProc) +
(ULONG)(ULONG_PTR)(lpHookEntry->nOriginalStubSize)) -
((ULONG)(ULONG_PTR)(lpHookEntry->lpInjCode) +
(ULONG)(ULONG_PTR)(p+ 4 - aCodeBlock));
p += sizeof(ULONG);
//----
if (FlagOn(lpHookEntry->dwFlags, NKTHOOKLIB_DisallowReentrancy))
{
p = (LPBYTE)(((SIZE_T)p + 3) & (~3)); //align 4
*((ULONG NKT_UNALIGNED*)lpRetStubs[0]) = *((ULONG NKT_UNALIGNED*)lpRetStubs[1]) =
(ULONG)((ULONG_PTR)(lpHookEntry->lpInjData + 4));
}
break;
#if defined(_M_X64)
case NKTHOOKLIB_ProcessPlatformX64:
*p++ = 0x52; //push rdx
if (FlagOn(lpHookEntry->dwFlags, NKTHOOKLIB_DisallowReentrancy))
{
*p++ = 0x50; //push rax
*p++ = 0x53; //push rbx
*p++ = 0x51; //push rcx
}
//----
*p++ = 0x48; *p++ = 0xBA; //mov rdx, OFFSET lpInjData
*((ULONGLONG NKT_UNALIGNED*)p) = (ULONGLONG)(lpHookEntry->lpInjData);
p += sizeof(ULONGLONG);
//----
*p++ = 0x48; *p++ = 0xF7; *p++ = 0x02; //test QWORD PTR [rdx], 00000101h
*((ULONG NKT_UNALIGNED*)p) = 0x00000101;
p += sizeof(ULONG);
//----
if (FlagOn(lpHookEntry->dwFlags, NKTHOOKLIB_DisallowReentrancy))
{
*p++ = 0x0F; *p++ = 0x85; //jne FAR CALL_ORIGINAL
lpCallOrigOfs[0] = p;
p += sizeof(ULONG);
}
else
{
*p++ = 0x75; //jne CALL_ORIGINAL
lpCallOrigOfs[0] = p++;
}
//check for reentranct
if (FlagOn(lpHookEntry->dwFlags, NKTHOOKLIB_DisallowReentrancy))
{
*p++ = 0x65; *p++ = 0x48; *p++ = 0x8B; *p++ = 0x04; //mov rax, gs:[30h]
*p++ = 0x25;
*((ULONG NKT_UNALIGNED*)p) = 0x30;
p += sizeof(ULONG);
//get thread ID
*p++ = 0x8B; *p++ = 0x40; *p++ = 0x48; //mov eax, DWORD PTR [rax+48h]
//----
*p++ = 0x48; *p++ = 0xBA; //mov rdx, OFFSET lpReturn
lpRetStubs[0] = p;
p += sizeof(ULONGLONG);
//----
*p++ = 0x48; *p++ = 0xC7; *p++ = 0xC1; //mov rcx, RETMINISTUBS_COUNT_X64
*((ULONG NKT_UNALIGNED*)p) = RETMINISTUBS_COUNT_X64;
p += sizeof(ULONG);
//---- L1:
*p++ = 0x3B; *p++ = 0x02; //cmp eax, DWORD PTR [rdx]
//----
*p++ = 0x0F; *p++ = 0x84; //je FAR CALL_ORIGINAL
lpCallOrigOfs[1] = p;
p += sizeof(ULONG);
//----
*p++ = 0x48; *p++ = 0x81; *p++ = 0xC2; //add rdx, 10h
*((ULONG NKT_UNALIGNED*)p) = 16;
p += sizeof(ULONG);
//----
*p++ = 0xE2; *p++ = 0xEF; //loop L1
//----
*p++ = 0x8B; *p++ = 0xD8; //mov ebx, eax
//----
*p++ = 0x48; *p++ = 0xBA; //mov rdx, OFFSET lpReturn
lpRetStubs[1] = p;
p += sizeof(ULONGLONG);
//----
*p++ = 0x48; *p++ = 0xC7; *p++ = 0xC1; //mov rcx, RETMINISTUBS_COUNT_X64
*((ULONG NKT_UNALIGNED*)p) = RETMINISTUBS_COUNT_X64;
p += sizeof(ULONG);
//---- L2:
*p++ = 0x48; *p++ = 0x33; *p++ = 0xC0; //xor rax, rax
//----
*p++ = 0xF0; *p++ = 0x0F; *p++ = 0xB1; *p++ = 0x1A; //lock cmpxchg DWORD PTR [rdx], ebx
//----
*p++ = 0x74; *p++ = 0x0B; //jz CHG_RETADDR
//----
*p++ = 0x48; *p++ = 0x81; *p++ = 0xC2; //add rdx, 10h
*((ULONG NKT_UNALIGNED*)p) = 16;
p += sizeof(ULONG);
//----
*p++ = 0xE2; *p++ = 0xEE; //loop L2
//----
*p++ = 0xEB; //jmp call_hooked
lpTempLoc = p++;
//---- CHG_RETADDR: original return address
*p++ = 0x48; *p++ = 0x8B; *p++ = 0x44; *p++ = 0x24; //mov rax, QWORD PTR [rsp+20h]
*p++ = 0x20;
//----
*p++ = 0x48; *p++ = 0x89; *p++ = 0x42; *p++ = 0x08; //mov QWORD PTR [rdx+8], rax
//----
*p++ = 0x48; *p++ = 0xB8; //mov rax, RETMINISTUBS_COUNT_X64
*((ULONGLONG NKT_UNALIGNED*)p) = RETMINISTUBS_COUNT_X64;
p += sizeof(ULONGLONG);
//----
*p++ = 0x48; *p++ = 0x29; *p++ = 0xC8; //sub rax, rcx
//----
*p++ = 0x48; *p++ = 0xC1; *p++ = 0xE0; *p++ = 0x05; //shl rax, 5
//----
*p++ = 0x48; *p++ = 0xB9; //mov rcx, OFFSET ministub return
lpRetStubs[2] = p;
p += sizeof(ULONGLONG);
//----
*p++ = 0x48; *p++ = 0x01; *p++ = 0xC8; //add rax, rcx
//----
*p++ = 0x48; *p++ = 0x89; *p++ = 0x44; *p++ = 0x24; //mov QWORD PTR [rsp+20h], rax
*p++ = 0x20;
//----
*lpTempLoc = (BYTE)(p - lpTempLoc - 1);
*p++ = 0x59; //pop rcx
*p++ = 0x5B; //pop rbx
*p++ = 0x58; //pop rax
}
*p++ = 0x5A; //pop rdx
//----
*p++ = 0x48; *p++ = 0xFF; *p++ = 0x25; //jmp hooked proc
*((ULONG NKT_UNALIGNED*)p) = 0;
p += sizeof(ULONG);
*((ULONGLONG NKT_UNALIGNED*)p) = (ULONGLONG)(lpHookEntry->lpNewProc);
p += sizeof(ULONGLONG);
//---- CALL_ORIGINAL:
if (FlagOn(lpHookEntry->dwFlags, NKTHOOKLIB_DisallowReentrancy))
{
*((LPDWORD)(lpCallOrigOfs[0])) = (DWORD)(p - lpCallOrigOfs[0] - 4);
*((LPDWORD)(lpCallOrigOfs[1])) = (DWORD)(p - lpCallOrigOfs[1] - 4);
*p++ = 0x59; //pop rcx
*p++ = 0x5B; //pop rbx
*p++ = 0x58; //pop rax
}
else
{
*lpCallOrigOfs[0] = (BYTE)(p - lpCallOrigOfs[0] - 1);
}
*p++ = 0x5A; //pop rdx
lpHookEntry->lpCall2Orig = lpHookEntry->lpInjCode + (SIZE_T)(p - aCodeBlock);
MemCopy(p, lpHookEntry->aNewStub, lpHookEntry->nNewStubSize); //new stub
p += lpHookEntry->nNewStubSize;
//----
*p++ = 0x48; *p++ = 0xFF; *p++ = 0x25; //jmp original proc after stub
*((ULONG NKT_UNALIGNED*)p) = 0;
p += sizeof(ULONG);
*((ULONGLONG NKT_UNALIGNED*)p) = (ULONGLONG)(lpHookEntry->lpOrigProc + lpHookEntry->nOriginalStubSize);
p += sizeof(ULONGLONG);
//----
if (FlagOn(lpHookEntry->dwFlags, NKTHOOKLIB_DisallowReentrancy))
{
p = (LPBYTE)(((SIZE_T)p + 3) & (~3)); //align 4
*((ULONGLONG NKT_UNALIGNED*)lpRetStubs[0]) = *((ULONGLONG NKT_UNALIGNED*)lpRetStubs[1]) =
((ULONGLONG)(lpHookEntry->lpInjData) + 8);
}
break;
#endif //_M_X64
}
//write return mini stubs
if (FlagOn(lpHookEntry->dwFlags, NKTHOOKLIB_DisallowReentrancy))
{
SIZE_T nOfs;
p = (LPBYTE)(((SIZE_T)p + 3) & (~3)); //align 4
nOfs = (SIZE_T)(lpHookEntry->lpInjData) + nSizeOfSizeT;
switch (cProcEntry->GetPlatform())
{
case NKTHOOKLIB_ProcessPlatformX86:
*((ULONG NKT_UNALIGNED*)lpRetStubs[2]) =
(ULONG)((ULONG_PTR)(lpHookEntry->lpInjCode + (ULONG_PTR)(p - aCodeBlock)));
for (i=0; i<RETMINISTUBS_COUNT_X86; i++,nOfs+=8)
{
*p++ = 0xFF; *p++ = 0x35; //push DWORD PTR [original return]
*((ULONG NKT_UNALIGNED*)p) = (ULONG)(nOfs + 4);
p += sizeof(ULONG);
//----
*p++ = 0xF0; *p++ = 0x83; *p++ = 0x25; //lock and DWORD PTR [thread], 0
*((ULONG NKT_UNALIGNED*)p) = (ULONG)nOfs;
p += sizeof(ULONG);
*p++ = 0x00;
//----
*p++ = 0xC3; //ret
//----
*p++ = 0x90; //one nop to complete 16 bytes
}
break;
#if defined(_M_X64)
case NKTHOOKLIB_ProcessPlatformX64:
*((ULONGLONG NKT_UNALIGNED*)lpRetStubs[2]) =
(ULONGLONG)((ULONG_PTR)(lpHookEntry->lpInjCode + (ULONG_PTR)(p - aCodeBlock)));
for (i=0; i<RETMINISTUBS_COUNT_X64; i++,nOfs+=16)
{
*p++ = 0x50; //push rax
//----
*p++ = 0x50; //push rax
//----
*p++ = 0x51; //push rcx
//----
*p++ = 0x48; *p++ = 0xB9; //mov rcx, OFFSET [thread/original return]
*((ULONGLONG NKT_UNALIGNED*)p) = (ULONGLONG)nOfs;
p += sizeof(ULONGLONG);
//----
*p++ = 0x48; *p++ = 0x8B; *p++ = 0x41; *p++ = 0x08; //mov rax, QWORD PTR [rcx+8] ;orig ret
//----
*p++ = 0x48; *p++ = 0x89; *p++ = 0x44; *p++ = 0x24; //mov QWORD PTR [rsp+0x10], rax
*p++ = 0x10;
//----
*p++ = 0xF0; *p++ = 0x48; *p++ = 0x83; *p++ = 0x21; //lock and QWORD PTR [rcxsp+], 0
*p++ = 0x00;
//----
*p++ = 0x59; //pop rcx
//----