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reactos/dll/appcompat/apphelp/shimeng.c
Mark Jansen 1570f08b4d
[APPHELP] Add ordinal import support
2019-05-01 19:22:19 +02:00

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/*
* PROJECT: ReactOS Application compatibility module
* LICENSE: GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
* PURPOSE: Shim engine core
* COPYRIGHT: Copyright 2015-2019 Mark Jansen (mark.jansen@reactos.org)
*/
#define WIN32_NO_STATUS
#include "ntndk.h"
#define IN_APPHELP
#include "shimlib.h"
#include <strsafe.h>
/* Make sure we don't include apphelp logging */
#define APPHELP_NOSDBPAPI
#include "apphelp.h"
#include "shimeng.h"
FARPROC WINAPI StubGetProcAddress(HINSTANCE hModule, LPCSTR lpProcName);
BOOL WINAPI SE_IsShimDll(PVOID BaseAddress);
static const UNICODE_STRING Ntdll = RTL_CONSTANT_STRING(L"ntdll.dll");
static const UNICODE_STRING Kernel32 = RTL_CONSTANT_STRING(L"kernel32.dll");
static const UNICODE_STRING Verifier = RTL_CONSTANT_STRING(L"verifier.dll");
extern HMODULE g_hInstance;
static UNICODE_STRING g_WindowsDirectory;
static UNICODE_STRING g_System32Directory;
static UNICODE_STRING g_SxsDirectory;
static UNICODE_STRING g_LoadingShimDll;
ULONG g_ShimEngDebugLevel = 0xffffffff;
BOOL g_bComPlusImage = FALSE;
BOOL g_bShimDuringInit = FALSE;
BOOL g_bInternalHooksUsed = FALSE;
static ARRAY g_pShimInfo; /* PSHIMMODULE */
static ARRAY g_pHookArray; /* HOOKMODULEINFO */
static ARRAY g_InExclude; /* INEXCLUDE */
typedef FARPROC(WINAPI* GETPROCADDRESSPROC)(HINSTANCE, LPCSTR);
/* If we have setup a hook for a function, we should also redirect GetProcAddress for this function */
HOOKAPIEX g_IntHookEx[] =
{
{
"kernel32.dll", /* LibraryName */
"GetProcAddress", /* FunctionName */
StubGetProcAddress, /* ReplacementFunction*/
NULL, /* OriginalFunction */
NULL, /* pShimInfo */
NULL /* ApiLink */
},
};
static inline BOOL ARRAY_InitWorker(PARRAY Array, DWORD ItemSize)
{
Array->Data__ = NULL;
Array->Size__ = Array->MaxSize__ = 0;
Array->ItemSize__ = ItemSize;
return TRUE;
}
static inline BOOL ARRAY_EnsureSize(PARRAY Array, DWORD ItemSize, DWORD GrowWith)
{
PVOID pNewData;
DWORD Count;
ASSERT(Array);
ASSERT(ItemSize == Array->ItemSize__);
if (Array->MaxSize__ > Array->Size__)
return TRUE;
Count = Array->Size__ + GrowWith;
pNewData = SeiAlloc(Count * ItemSize);
if (!pNewData)
{
SHIMENG_FAIL("Failed to allocate %d bytes\n", Count * ItemSize);
return FALSE;
}
Array->MaxSize__ = Count;
if (Array->Data__)
{
memcpy(pNewData, Array->Data__, Array->Size__ * ItemSize);
SeiFree(Array->Data__);
}
Array->Data__ = pNewData;
return TRUE;
}
static inline PVOID ARRAY_AppendWorker(PARRAY Array, DWORD ItemSize, DWORD GrowWith)
{
PBYTE pData;
if (!ARRAY_EnsureSize(Array, ItemSize, GrowWith))
return NULL;
pData = Array->Data__;
pData += (Array->Size__ * ItemSize);
Array->Size__++;
return pData;
}
static inline PVOID ARRAY_AtWorker(PARRAY Array, DWORD ItemSize, DWORD n)
{
PBYTE pData;
ASSERT(Array);
ASSERT(ItemSize == Array->ItemSize__);
ASSERT(n < Array->Size__);
pData = Array->Data__;
return pData + (n * ItemSize);
}
#define ARRAY_Init(Array, TypeOfArray) ARRAY_InitWorker((Array), sizeof(TypeOfArray))
#define ARRAY_Append(Array, TypeOfArray) (TypeOfArray*)ARRAY_AppendWorker((Array), sizeof(TypeOfArray), 5)
#define ARRAY_At(Array, TypeOfArray, at) (TypeOfArray*)ARRAY_AtWorker((Array), sizeof(TypeOfArray), at)
#define ARRAY_Size(Array) (Array)->Size__
VOID SeiInitDebugSupport(VOID)
{
static const UNICODE_STRING DebugKey = RTL_CONSTANT_STRING(L"SHIMENG_DEBUG_LEVEL");
UNICODE_STRING DebugValue;
NTSTATUS Status;
ULONG NewLevel = SEI_MSG; /* Show some basic info in the logs, unless configured different */
WCHAR Buffer[40];
RtlInitEmptyUnicodeString(&DebugValue, Buffer, sizeof(Buffer));
Status = RtlQueryEnvironmentVariable_U(NULL, &DebugKey, &DebugValue);
if (NT_SUCCESS(Status))
{
if (!NT_SUCCESS(RtlUnicodeStringToInteger(&DebugValue, 10, &NewLevel)))
NewLevel = 0;
}
g_ShimEngDebugLevel = NewLevel;
}
/**
* Outputs diagnostic info.
*
* @param [in] Level The level to log this message with, choose any of [SHIM_ERR,
* SHIM_WARN, SHIM_INFO].
* @param [in] FunctionName The function this log should be attributed to.
* @param [in] Format The format string.
* @param ... Variable arguments providing additional information.
*
* @return Success: TRUE Failure: FALSE.
*/
BOOL WINAPIV SeiDbgPrint(SEI_LOG_LEVEL Level, PCSTR Function, PCSTR Format, ...)
{
char Buffer[512];
char* Current = Buffer;
const char* LevelStr;
size_t Length = sizeof(Buffer);
va_list ArgList;
HRESULT hr;
if (g_ShimEngDebugLevel == 0xffffffff)
SeiInitDebugSupport();
if (Level > g_ShimEngDebugLevel)
return FALSE;
switch (Level)
{
case SEI_MSG:
LevelStr = "MSG ";
break;
case SEI_FAIL:
LevelStr = "FAIL";
break;
case SEI_WARN:
LevelStr = "WARN";
break;
case SEI_INFO:
LevelStr = "INFO";
break;
default:
LevelStr = "USER";
break;
}
if (Function)
hr = StringCchPrintfExA(Current, Length, &Current, &Length, STRSAFE_NULL_ON_FAILURE, "[%s] [%s] ", LevelStr, Function);
else
hr = StringCchPrintfExA(Current, Length, &Current, &Length, STRSAFE_NULL_ON_FAILURE, "[%s] ", LevelStr);
if (!SUCCEEDED(hr))
return FALSE;
va_start(ArgList, Format);
hr = StringCchVPrintfExA(Current, Length, &Current, &Length, STRSAFE_NULL_ON_FAILURE, Format, ArgList);
va_end(ArgList);
if (!SUCCEEDED(hr))
return FALSE;
DbgPrint("%s", Buffer);
return TRUE;
}
static
BOOL SeiIsOrdinalName(LPCSTR lpProcName)
{
return (ULONG_PTR)lpProcName <= MAXUSHORT;
}
LPCSTR SeiPrintFunctionName(LPCSTR lpProcName, char szOrdProcFmt[10])
{
if (SeiIsOrdinalName(lpProcName))
{
StringCchPrintfA(szOrdProcFmt, 10, "#%Iu", (ULONG_PTR)lpProcName);
return szOrdProcFmt;
}
return lpProcName;
}
int SeiCompareFunctionName(LPCSTR lpProcName1, LPCSTR lpProcName2)
{
BOOL Ord1 = SeiIsOrdinalName(lpProcName1);
BOOL Ord2 = SeiIsOrdinalName(lpProcName2);
/* One is an ordinal, the other not */
if (Ord1 != Ord2)
return 1;
/* Compare ordinals */
if (Ord1)
return (ULONG_PTR)lpProcName1 != (ULONG_PTR)lpProcName2;
/* Compare names */
return strcmp(lpProcName1, lpProcName2);
}
PVOID SeiGetModuleFromAddress(PVOID addr)
{
PVOID hModule = NULL;
RtlPcToFileHeader(addr, &hModule);
return hModule;
}
/* TODO: Guard against recursive calling / calling init multiple times! */
VOID NotifyShims(DWORD dwReason, PVOID Info)
{
DWORD n;
for (n = 0; n < ARRAY_Size(&g_pShimInfo); ++n)
{
PSHIMMODULE pShimModule = *ARRAY_At(&g_pShimInfo, PSHIMMODULE, n);
if (!pShimModule->pNotifyShims)
continue;
pShimModule->pNotifyShims(dwReason, Info);
}
}
VOID SeiCheckComPlusImage(PVOID BaseAddress)
{
ULONG ComSectionSize;
g_bComPlusImage = RtlImageDirectoryEntryToData(BaseAddress, TRUE, IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR, &ComSectionSize) != NULL;
SHIMENG_INFO("COM+ executable %s\n", g_bComPlusImage ? "TRUE" : "FALSE");
}
PSHIMMODULE SeiGetShimModuleInfo(PVOID BaseAddress)
{
DWORD n;
for (n = 0; n < ARRAY_Size(&g_pShimInfo); ++n)
{
PSHIMMODULE pShimModule = *ARRAY_At(&g_pShimInfo, PSHIMMODULE, n);
if (pShimModule->BaseAddress == BaseAddress)
return pShimModule;
}
return NULL;
}
PSHIMMODULE SeiCreateShimModuleInfo(PCWSTR DllName, PVOID BaseAddress)
{
static const ANSI_STRING GetHookAPIs = RTL_CONSTANT_STRING("GetHookAPIs");
static const ANSI_STRING NotifyShims = RTL_CONSTANT_STRING("NotifyShims");
PSHIMMODULE* pData, Data;
PVOID pGetHookAPIs, pNotifyShims;
if (!NT_SUCCESS(LdrGetProcedureAddress(BaseAddress, (PANSI_STRING)&GetHookAPIs, 0, &pGetHookAPIs)) ||
!NT_SUCCESS(LdrGetProcedureAddress(BaseAddress, (PANSI_STRING)&NotifyShims, 0, &pNotifyShims)))
{
SHIMENG_WARN("Failed to resolve entry points for %S\n", DllName);
return NULL;
}
pData = ARRAY_Append(&g_pShimInfo, PSHIMMODULE);
if (!pData)
return NULL;
*pData = SeiAlloc(sizeof(SHIMMODULE));
Data = *pData;
RtlCreateUnicodeString(&Data->Name, DllName);
Data->BaseAddress = BaseAddress;
Data->pGetHookAPIs = pGetHookAPIs;
Data->pNotifyShims = pNotifyShims;
ARRAY_Init(&Data->EnabledShims, PSHIMINFO);
return Data;
}
PSHIMINFO SeiAppendHookInfo(PSHIMMODULE pShimModuleInfo, PHOOKAPIEX pHookApi, DWORD dwHookCount, PCWSTR ShimName)
{
PSHIMINFO* pData, Data;
pData = ARRAY_Append(&pShimModuleInfo->EnabledShims, PSHIMINFO);
if (!pData)
return NULL;
*pData = SeiAlloc(sizeof(SHIMINFO));
Data = *pData;
if (!Data)
return NULL;
Data->ShimName = SdbpStrDup(ShimName);
if (!Data->ShimName)
return NULL;
Data->pHookApi = pHookApi;
Data->dwHookCount = dwHookCount;
Data->pShimModule = pShimModuleInfo;
ARRAY_Init(&Data->InExclude, INEXCLUDE);
return Data;
}
PHOOKMODULEINFO SeiFindHookModuleInfo(PUNICODE_STRING ModuleName, PVOID BaseAddress)
{
DWORD n;
if (ModuleName == NULL && BaseAddress == NULL)
{
BaseAddress = NtCurrentPeb()->ImageBaseAddress;
}
for (n = 0; n < ARRAY_Size(&g_pHookArray); ++n)
{
PHOOKMODULEINFO pModuleInfo = ARRAY_At(&g_pHookArray, HOOKMODULEINFO, n);
if (BaseAddress && BaseAddress == pModuleInfo->BaseAddress)
return pModuleInfo;
if (!BaseAddress && RtlEqualUnicodeString(ModuleName, &pModuleInfo->Name, TRUE))
return pModuleInfo;
}
return NULL;
}
PHOOKMODULEINFO SeiFindHookModuleInfoForImportDescriptor(PBYTE DllBase, PIMAGE_IMPORT_DESCRIPTOR ImportDescriptor)
{
UNICODE_STRING DllName;
PVOID DllHandle;
NTSTATUS Success;
if (!RtlCreateUnicodeStringFromAsciiz(&DllName, (PCSZ)(DllBase + ImportDescriptor->Name)))
{
SHIMENG_FAIL("Unable to convert dll name to unicode\n");
return NULL;
}
Success = LdrGetDllHandle(NULL, NULL, &DllName, &DllHandle);
if (!NT_SUCCESS(Success))
{
SHIMENG_FAIL("Unable to get module handle for %wZ (%p)\n", &DllName, DllBase);
RtlFreeUnicodeString(&DllName);
return NULL;
}
RtlFreeUnicodeString(&DllName);
return SeiFindHookModuleInfo(NULL, DllHandle);
}
static LPCWSTR SeiGetStringPtr(PDB pdb, TAGID tag, TAG type)
{
TAGID tagEntry = SdbFindFirstTag(pdb, tag, type);
if (tagEntry == TAGID_NULL)
return NULL;
return SdbGetStringTagPtr(pdb, tagEntry);
}
static DWORD SeiGetDWORD(PDB pdb, TAGID tag, TAG type)
{
TAGID tagEntry = SdbFindFirstTag(pdb, tag, type);
if (tagEntry == TAGID_NULL)
return 0;
return SdbReadDWORDTag(pdb, tagEntry, 0);
}
static QWORD SeiGetQWORD(PDB pdb, TAGID tag, TAG type)
{
TAGID tagEntry = SdbFindFirstTag(pdb, tag, type);
if (tagEntry == TAGID_NULL)
return 0;
return SdbReadQWORDTag(pdb, tagEntry, 0);
}
static VOID SeiAddShim(TAGREF trShimRef, PARRAY pShimRef)
{
TAGREF* Data;
Data = ARRAY_Append(pShimRef, TAGREF);
if (!Data)
return;
*Data = trShimRef;
}
static VOID SeiAddFlag(PDB pdb, TAGID tiFlagRef, PFLAGINFO pFlagInfo)
{
ULARGE_INTEGER Flag;
/* Resolve the FLAG_REF to the real FLAG node */
TAGID FlagTag = SeiGetDWORD(pdb, tiFlagRef, TAG_FLAG_TAGID);
if (FlagTag == TAGID_NULL)
return;
pFlagInfo->AppCompatFlags.QuadPart |= SeiGetQWORD(pdb, FlagTag, TAG_FLAG_MASK_KERNEL);
pFlagInfo->AppCompatFlagsUser.QuadPart |= SeiGetQWORD(pdb, FlagTag, TAG_FLAG_MASK_USER);
Flag.QuadPart = SeiGetQWORD(pdb, FlagTag, TAG_FLAG_PROCESSPARAM);
pFlagInfo->ProcessParameters_Flags |= Flag.LowPart;
}
/* Propagate layers to child processes */
static VOID SeiSetLayerEnvVar(LPCWSTR wszLayer)
{
NTSTATUS Status;
UNICODE_STRING VarName = RTL_CONSTANT_STRING(L"__COMPAT_LAYER");
UNICODE_STRING Value;
RtlInitUnicodeString(&Value, wszLayer);
Status = RtlSetEnvironmentVariable(NULL, &VarName, &Value);
if (NT_SUCCESS(Status))
SHIMENG_INFO("%wZ=%wZ\n", &VarName, &Value);
else
SHIMENG_FAIL("Failed to set %wZ: 0x%x\n", &VarName, Status);
}
#define MAX_LAYER_LENGTH 256
/* Translate all Exe and Layer entries to Shims, and propagate all layers */
static VOID SeiBuildShimRefArray(HSDB hsdb, SDBQUERYRESULT* pQuery, PARRAY pShimRef, PFLAGINFO pFlagInfo)
{
WCHAR wszLayerEnvVar[MAX_LAYER_LENGTH] = { 0 };
DWORD n;
for (n = 0; n < pQuery->dwExeCount; ++n)
{
PDB pdb;
TAGID tag;
if (SdbTagRefToTagID(hsdb, pQuery->atrExes[n], &pdb, &tag))
{
LPCWSTR ExeName = SeiGetStringPtr(pdb, tag, TAG_NAME);
TAGID ShimRef = SdbFindFirstTag(pdb, tag, TAG_SHIM_REF);
TAGID FlagRef = SdbFindFirstTag(pdb, tag, TAG_FLAG_REF);
if (ExeName)
SeiDbgPrint(SEI_MSG, NULL, "ShimInfo(Exe(%S))\n", ExeName);
while (ShimRef != TAGID_NULL)
{
TAGREF trShimRef;
if (SdbTagIDToTagRef(hsdb, pdb, ShimRef, &trShimRef))
SeiAddShim(trShimRef, pShimRef);
ShimRef = SdbFindNextTag(pdb, tag, ShimRef);
}
while (FlagRef != TAGID_NULL)
{
SeiAddFlag(pdb, FlagRef, pFlagInfo);
FlagRef = SdbFindNextTag(pdb, tag, FlagRef);
}
}
}
for (n = 0; n < pQuery->dwLayerCount; ++n)
{
PDB pdb;
TAGID tag;
if (SdbTagRefToTagID(hsdb, pQuery->atrLayers[n], &pdb, &tag))
{
LPCWSTR LayerName = SeiGetStringPtr(pdb, tag, TAG_NAME);
TAGID ShimRef = SdbFindFirstTag(pdb, tag, TAG_SHIM_REF);
TAGID FlagRef = SdbFindFirstTag(pdb, tag, TAG_FLAG_REF);
if (LayerName)
{
HRESULT hr;
SeiDbgPrint(SEI_MSG, NULL, "ShimInfo(Layer(%S))\n", LayerName);
if (wszLayerEnvVar[0])
StringCchCatW(wszLayerEnvVar, ARRAYSIZE(wszLayerEnvVar), L" ");
hr = StringCchCatW(wszLayerEnvVar, ARRAYSIZE(wszLayerEnvVar), LayerName);
if (!SUCCEEDED(hr))
{
SHIMENG_FAIL("Unable to append %S\n", LayerName);
}
}
while (ShimRef != TAGID_NULL)
{
TAGREF trShimRef;
if (SdbTagIDToTagRef(hsdb, pdb, ShimRef, &trShimRef))
SeiAddShim(trShimRef, pShimRef);
ShimRef = SdbFindNextTag(pdb, tag, ShimRef);
}
while (FlagRef != TAGID_NULL)
{
SeiAddFlag(pdb, FlagRef, pFlagInfo);
FlagRef = SdbFindNextTag(pdb, tag, FlagRef);
}
}
}
if (wszLayerEnvVar[0])
SeiSetLayerEnvVar(wszLayerEnvVar);
}
/* Given the hooks from one shim, find the relevant modules and store the combination of module + hook */
VOID SeiAddHooks(PHOOKAPIEX hooks, DWORD dwHookCount, PSHIMINFO pShim)
{
DWORD n, j;
UNICODE_STRING UnicodeModName;
WCHAR Buf[512];
RtlInitEmptyUnicodeString(&UnicodeModName, Buf, sizeof(Buf));
for (n = 0; n < dwHookCount; ++n)
{
ANSI_STRING AnsiString;
PVOID DllHandle;
PHOOKAPIEX hook = hooks + n;
PHOOKAPIEX* pHookApi;
PHOOKMODULEINFO HookModuleInfo;
RtlInitAnsiString(&AnsiString, hook->LibraryName);
if (!NT_SUCCESS(RtlAnsiStringToUnicodeString(&UnicodeModName, &AnsiString, FALSE)))
{
SHIMENG_FAIL("Unable to convert %s to Unicode\n", hook->LibraryName);
continue;
}
if (NT_SUCCESS(LdrGetDllHandle(NULL, 0, &UnicodeModName, &DllHandle)))
{
HookModuleInfo = SeiFindHookModuleInfo(NULL, DllHandle);
}
else
{
HookModuleInfo = SeiFindHookModuleInfo(&UnicodeModName, NULL);
DllHandle = NULL;
}
if (!HookModuleInfo)
{
HookModuleInfo = ARRAY_Append(&g_pHookArray, HOOKMODULEINFO);
if (!HookModuleInfo)
continue;
HookModuleInfo->BaseAddress = DllHandle;
ARRAY_Init(&HookModuleInfo->HookApis, PHOOKAPIEX);
RtlCreateUnicodeString(&HookModuleInfo->Name, UnicodeModName.Buffer);
}
hook->pShimInfo = pShim;
for (j = 0; j < ARRAY_Size(&HookModuleInfo->HookApis); ++j)
{
PHOOKAPIEX HookApi = *ARRAY_At(&HookModuleInfo->HookApis, PHOOKAPIEX, j);
int CmpResult = SeiCompareFunctionName(hook->FunctionName, HookApi->FunctionName);
if (CmpResult == 0)
{
while (HookApi->ApiLink)
{
HookApi = HookApi->ApiLink;
}
HookApi->ApiLink = hook;
hook = NULL;
break;
}
}
/* No place found yet, append it */
if (hook)
{
pHookApi = ARRAY_Append(&HookModuleInfo->HookApis, PHOOKAPIEX);
if (pHookApi)
*pHookApi = hook;
}
}
}
/* Check if we should fake the return from GetProcAddress (because we also redirected the iat for this module) */
FARPROC WINAPI StubGetProcAddress(HINSTANCE hModule, LPCSTR lpProcName)
{
PVOID Addr = _ReturnAddress();
PHOOKMODULEINFO HookModuleInfo;
FARPROC proc = ((GETPROCADDRESSPROC)g_IntHookEx[0].OriginalFunction)(hModule, lpProcName);
char szOrdProcFmt[10];
Addr = SeiGetModuleFromAddress(Addr);
if (SE_IsShimDll(Addr))
{
SHIMENG_MSG("Not touching GetProcAddress for shim dll (%p!%s)", hModule, SeiPrintFunctionName(lpProcName, szOrdProcFmt));
return proc;
}
SHIMENG_INFO("(GetProcAddress(%p!%s) => %p\n", hModule, SeiPrintFunctionName(lpProcName, szOrdProcFmt), proc);
HookModuleInfo = SeiFindHookModuleInfo(NULL, hModule);
if (HookModuleInfo)
{
DWORD n;
for (n = 0; n < ARRAY_Size(&HookModuleInfo->HookApis); ++n)
{
PHOOKAPIEX HookApi = *ARRAY_At(&HookModuleInfo->HookApis, PHOOKAPIEX, n);
int CmpResult = SeiCompareFunctionName(lpProcName, HookApi->FunctionName);
if (CmpResult == 0)
{
SHIMENG_MSG("Redirecting %p to %p\n", proc, HookApi->ReplacementFunction);
proc = HookApi->ReplacementFunction;
break;
}
}
}
return proc;
}
VOID SeiResolveAPI(PHOOKMODULEINFO HookModuleInfo)
{
DWORD n;
ANSI_STRING AnsiString;
ASSERT(HookModuleInfo->BaseAddress != NULL);
for (n = 0; n < ARRAY_Size(&HookModuleInfo->HookApis); ++n)
{
NTSTATUS Status;
PVOID ProcAddress;
PHOOKAPIEX HookApi = *ARRAY_At(&HookModuleInfo->HookApis, PHOOKAPIEX, n);
if (!SeiIsOrdinalName(HookApi->FunctionName))
{
RtlInitAnsiString(&AnsiString, HookApi->FunctionName);
Status = LdrGetProcedureAddress(HookModuleInfo->BaseAddress, &AnsiString, 0, &ProcAddress);
}
else
{
Status = LdrGetProcedureAddress(HookModuleInfo->BaseAddress, NULL, (ULONG_PTR)HookApi->FunctionName, &ProcAddress);
}
if (!NT_SUCCESS(Status))
{
char szOrdProcFmt[10];
LPCSTR lpFunctionName = SeiPrintFunctionName(HookApi->FunctionName, szOrdProcFmt);
SHIMENG_FAIL("Unable to retrieve %s!%s\n", HookApi->LibraryName, lpFunctionName);
continue;
}
HookApi->OriginalFunction = ProcAddress;
if (HookApi->ApiLink)
{
SHIMENG_MSG("TODO: Figure out how to handle conflicting In/Exports with ApiLink!\n");
}
while (HookApi->ApiLink)
{
HookApi->ApiLink->OriginalFunction = HookApi->OriginalFunction;
HookApi->OriginalFunction = HookApi->ApiLink->ReplacementFunction;
HookApi = HookApi->ApiLink;
}
}
}
/* Walk all shim modules / enabled shims, and add their hooks */
VOID SeiResolveAPIs(VOID)
{
DWORD n;
for (n = 0; n < ARRAY_Size(&g_pHookArray); ++n)
{
PHOOKMODULEINFO pModuleInfo = ARRAY_At(&g_pHookArray, HOOKMODULEINFO, n);
/* Is this module loaded? */
if (pModuleInfo->BaseAddress)
{
SeiResolveAPI(pModuleInfo);
}
}
}
VOID SeiCombineHookInfo(VOID)
{
DWORD mod, n;
/* Enumerate all Shim modules */
for (mod = 0; mod < ARRAY_Size(&g_pShimInfo); ++mod)
{
PSHIMMODULE pShimModule = *ARRAY_At(&g_pShimInfo, PSHIMMODULE, mod);
DWORD dwShimCount = ARRAY_Size(&pShimModule->EnabledShims);
/* Enumerate all Shims */
for (n = 0; n < dwShimCount; ++n)
{
PSHIMINFO pShim = *ARRAY_At(&pShimModule->EnabledShims, PSHIMINFO, n);
PHOOKAPIEX hooks = pShim->pHookApi;
DWORD dwHookCount = pShim->dwHookCount;
SeiAddHooks(hooks, dwHookCount, pShim);
}
}
}
/* If we hooked something, we should also redirect GetProcAddress */
VOID SeiAddInternalHooks(DWORD dwNumHooks)
{
if (dwNumHooks == 0)
{
g_bInternalHooksUsed = FALSE;
return;
}
SeiAddHooks(g_IntHookEx, ARRAYSIZE(g_IntHookEx), NULL);
g_bInternalHooksUsed = TRUE;
}
/* Patch one function in the iat */
VOID SeiPatchNewImport(PIMAGE_THUNK_DATA FirstThunk, PHOOKAPIEX HookApi, PLDR_DATA_TABLE_ENTRY LdrEntry)
{
ULONG OldProtection = 0;
PVOID Ptr;
SIZE_T Size;
NTSTATUS Status;
char szOrdProcFmt[10];
SHIMENG_INFO("Hooking API \"%s!%s\" for DLL \"%wZ\"\n", HookApi->LibraryName, SeiPrintFunctionName(HookApi->FunctionName, szOrdProcFmt), &LdrEntry->BaseDllName);
Ptr = &FirstThunk->u1.Function;
Size = sizeof(FirstThunk->u1.Function);
Status = NtProtectVirtualMemory(NtCurrentProcess(), &Ptr, &Size, PAGE_EXECUTE_READWRITE, &OldProtection);
if (!NT_SUCCESS(Status))
{
SHIMENG_FAIL("Unable to unprotect 0x%p\n", &FirstThunk->u1.Function);
return;
}
SHIMENG_INFO("changing 0x%p to 0x%p\n", FirstThunk->u1.Function, HookApi->ReplacementFunction);
FirstThunk->u1.Function = (ULONG_PTR)HookApi->ReplacementFunction;
Size = sizeof(FirstThunk->u1.Function);
Status = NtProtectVirtualMemory(NtCurrentProcess(), &Ptr, &Size, OldProtection, &OldProtection);
if (!NT_SUCCESS(Status))
{
SHIMENG_WARN("Unable to reprotect 0x%p\n", &FirstThunk->u1.Function);
}
}
PINEXCLUDE SeiFindInExclude(PARRAY InExclude, PCUNICODE_STRING DllName)
{
DWORD n;
for (n = 0; n < ARRAY_Size(InExclude); ++n)
{
PINEXCLUDE InEx = ARRAY_At(InExclude, INEXCLUDE, n);
if (RtlEqualUnicodeString(&InEx->Module, DllName, TRUE))
return InEx;
}
return NULL;
}
BOOL SeiIsExcluded(PLDR_DATA_TABLE_ENTRY LdrEntry, PHOOKAPIEX HookApi)
{
PSHIMINFO pShimInfo = HookApi->pShimInfo;
PINEXCLUDE InExclude;
BOOL IsExcluded = FALSE;
char szOrdProcFmt[10];
if (!pShimInfo)
{
/* Internal hook, do not exclude it */
return FALSE;
}
/* By default, everything from System32 or WinSxs is excluded */
if (RtlPrefixUnicodeString(&g_System32Directory, &LdrEntry->FullDllName, TRUE) ||
RtlPrefixUnicodeString(&g_SxsDirectory, &LdrEntry->FullDllName, TRUE))
IsExcluded = TRUE;
InExclude = SeiFindInExclude(&pShimInfo->InExclude, &LdrEntry->BaseDllName);
if (InExclude)
{
/* If it is on the 'exclude' list, bail out */
if (!InExclude->Include)
{
SHIMENG_INFO("Module '%wZ' excluded for shim %S, API '%s!%s', because it on in the exclude list.\n",
&LdrEntry->BaseDllName, pShimInfo->ShimName, HookApi->LibraryName, SeiPrintFunctionName(HookApi->FunctionName, szOrdProcFmt));
return TRUE;
}
/* If it is on the 'include' list, override System32 / Winsxs check. */
if (IsExcluded)
{
SHIMENG_INFO("Module '%wZ' included for shim %S, API '%s!%s', because it is on the include list.\n",
&LdrEntry->BaseDllName, pShimInfo->ShimName, HookApi->LibraryName, SeiPrintFunctionName(HookApi->FunctionName, szOrdProcFmt));
}
IsExcluded = FALSE;
}
if (IsExcluded)
{
SHIMENG_INFO("Module '%wZ' excluded for shim %S, API '%s!%s', because it is in System32/WinSXS.\n",
&LdrEntry->BaseDllName, pShimInfo->ShimName, HookApi->LibraryName, SeiPrintFunctionName(HookApi->FunctionName, szOrdProcFmt));
}
return IsExcluded;
}
VOID SeiAppendInExclude(PARRAY dest, PCWSTR ModuleName, BOOL IsInclude)
{
PINEXCLUDE InExclude;
UNICODE_STRING ModuleNameU;
RtlInitUnicodeString(&ModuleNameU, ModuleName);
InExclude = SeiFindInExclude(dest, &ModuleNameU);
if (InExclude)
{
InExclude->Include = IsInclude;
return;
}
InExclude = ARRAY_Append(dest, INEXCLUDE);
if (InExclude)
{
PCWSTR ModuleNameCopy = SdbpStrDup(ModuleName);
RtlInitUnicodeString(&InExclude->Module, ModuleNameCopy);
InExclude->Include = IsInclude;
}
}
/* Read the INEXCLUD tags from a given parent tag */
VOID SeiReadInExclude(PDB pdb, TAGID parent, PARRAY dest)
{
TAGID InExcludeTag;
InExcludeTag = SdbFindFirstTag(pdb, parent, TAG_INEXCLUD);
while (InExcludeTag != TAGID_NULL)
{
PCWSTR ModuleName;
TAGID ModuleTag = SdbFindFirstTag(pdb, InExcludeTag, TAG_MODULE);
TAGID IncludeTag = SdbFindFirstTag(pdb, InExcludeTag, TAG_INCLUDE);
ModuleName = SdbGetStringTagPtr(pdb, ModuleTag);
if (ModuleName)
{
SeiAppendInExclude(dest, ModuleName, IncludeTag != TAGID_NULL);
}
else
{
SHIMENG_WARN("INEXCLUDE without Module: 0x%x\n", InExcludeTag);
}
InExcludeTag = SdbFindNextTag(pdb, parent, InExcludeTag);
}
}
VOID SeiBuildGlobalInclExclList(HSDB hsdb)
{
PDB pdb;
TAGREF tr = TAGREF_ROOT;
TAGID root, db, library;
if (!SdbTagRefToTagID(hsdb, tr, &pdb, &root))
{
SHIMENG_WARN("Unable to resolve database root\n");
return;
}
db = SdbFindFirstTag(pdb, root, TAG_DATABASE);
if (db == TAGID_NULL)
{
SHIMENG_WARN("Unable to resolve database\n");
return;
}
library = SdbFindFirstTag(pdb, db, TAG_LIBRARY);
if (library == TAGID_NULL)
{
SHIMENG_WARN("Unable to resolve library\n");
return;
}
SeiReadInExclude(pdb, library, &g_InExclude);
}
VOID SeiBuildInclExclList(PDB pdb, TAGID ShimTag, PSHIMINFO pShimInfo)
{
DWORD n;
/* First duplicate the global in/excludes */
for (n = 0; n < ARRAY_Size(&g_InExclude); ++n)
{
PINEXCLUDE InEx = ARRAY_At(&g_InExclude, INEXCLUDE, n);
SeiAppendInExclude(&pShimInfo->InExclude, InEx->Module.Buffer, InEx->Include);
}
/* Now read this shim's in/excludes (possibly overriding the global ones) */
SeiReadInExclude(pdb, ShimTag, &pShimInfo->InExclude);
}
/* Given one loaded module, redirect (hook) all functions from the iat that are registered by shims */
VOID SeiHookImports(PLDR_DATA_TABLE_ENTRY LdrEntry)
{
ULONG Size;
PIMAGE_IMPORT_DESCRIPTOR ImportDescriptor;
PBYTE DllBase = LdrEntry->DllBase;
if (SE_IsShimDll(DllBase) ||
g_hInstance == LdrEntry->DllBase ||
RtlEqualUnicodeString(&g_LoadingShimDll, &LdrEntry->BaseDllName, TRUE))
{
SHIMENG_INFO("Skipping shim module 0x%p \"%wZ\"\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
return;
}
if (LdrEntry->Flags & LDRP_COMPAT_DATABASE_PROCESSED)
{
SHIMENG_INFO("Skipping module 0x%p \"%wZ\" because it was already processed\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
return;
}
ImportDescriptor = RtlImageDirectoryEntryToData(DllBase, TRUE, IMAGE_DIRECTORY_ENTRY_IMPORT, &Size);
if (!ImportDescriptor)
{
SHIMENG_INFO("Skipping module 0x%p \"%wZ\" due to no iat found\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
return;
}
SHIMENG_INFO("Hooking module 0x%p \"%wZ\"\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
for ( ;ImportDescriptor->Name && ImportDescriptor->OriginalFirstThunk; ImportDescriptor++)
{
PHOOKMODULEINFO HookModuleInfo;
/* Do we have hooks for this module? */
HookModuleInfo = SeiFindHookModuleInfoForImportDescriptor(DllBase, ImportDescriptor);
if (HookModuleInfo)
{
PIMAGE_THUNK_DATA OriginalThunk, FirstThunk;
DWORD n;
for (n = 0; n < ARRAY_Size(&HookModuleInfo->HookApis); ++n)
{
DWORD dwFound = 0;
PHOOKAPIEX HookApi = *ARRAY_At(&HookModuleInfo->HookApis, PHOOKAPIEX, n);
/* Check if this module should be excluded from being hooked (system32/winsxs, global or shim exclude) */
if (SeiIsExcluded(LdrEntry, HookApi))
{
continue;
}
OriginalThunk = (PIMAGE_THUNK_DATA)(DllBase + ImportDescriptor->OriginalFirstThunk);
FirstThunk = (PIMAGE_THUNK_DATA)(DllBase + ImportDescriptor->FirstThunk);
/* Walk all imports */
for (;OriginalThunk->u1.AddressOfData && FirstThunk->u1.Function; OriginalThunk++, FirstThunk++)
{
if (!IMAGE_SNAP_BY_ORDINAL(OriginalThunk->u1.Function))
{
if (!SeiIsOrdinalName(HookApi->FunctionName))
{
PIMAGE_IMPORT_BY_NAME ImportName;
ImportName = (PIMAGE_IMPORT_BY_NAME)(DllBase + OriginalThunk->u1.Function);
if (!strcmp((PCSTR)ImportName->Name, HookApi->FunctionName))
{
SeiPatchNewImport(FirstThunk, HookApi, LdrEntry);
/* Sadly, iat does not have to be sorted, and can even contain duplicate entries. */
dwFound++;
}
}
}
else
{
if (SeiIsOrdinalName(HookApi->FunctionName))
{
if ((PCSTR)IMAGE_ORDINAL(OriginalThunk->u1.Function) == HookApi->FunctionName)
{
SeiPatchNewImport(FirstThunk, HookApi, LdrEntry);
dwFound++;
}
}
}
}
if (dwFound != 1)
{
char szOrdProcFmt[10];
LPCSTR FuncName = SeiPrintFunctionName(HookApi->FunctionName, szOrdProcFmt);
/* One entry not found. */
if (!dwFound)
SHIMENG_INFO("Entry \"%s!%s\" not found for \"%wZ\"\n", HookApi->LibraryName, FuncName, &LdrEntry->BaseDllName);
else
SHIMENG_INFO("Entry \"%s!%s\" found %d times for \"%wZ\"\n", HookApi->LibraryName, FuncName, dwFound, &LdrEntry->BaseDllName);
}
}
}
}
/* Mark this module as processed. */
LdrEntry->Flags |= LDRP_COMPAT_DATABASE_PROCESSED;
}
VOID PatchNewModules(PPEB Peb)
{
PLIST_ENTRY ListHead, ListEntry;
PLDR_DATA_TABLE_ENTRY LdrEntry;
ListHead = &NtCurrentPeb()->Ldr->InLoadOrderModuleList;
ListEntry = ListHead->Flink;
while (ListHead != ListEntry)
{
LdrEntry = CONTAINING_RECORD(ListEntry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks);
SeiHookImports(LdrEntry);
ListEntry = ListEntry->Flink;
}
}
VOID SeiInitPaths(VOID)
{
#define SYSTEM32 L"\\system32"
#define WINSXS L"\\winsxs"
PWSTR WindowsDirectory = SdbpStrDup(SharedUserData->NtSystemRoot);
RtlInitUnicodeString(&g_WindowsDirectory, WindowsDirectory);
g_System32Directory.MaximumLength = g_WindowsDirectory.Length + SdbpStrsize(SYSTEM32);
g_System32Directory.Buffer = SdbpAlloc(g_System32Directory.MaximumLength);
RtlCopyUnicodeString(&g_System32Directory, &g_WindowsDirectory);
RtlAppendUnicodeToString(&g_System32Directory, SYSTEM32);
g_SxsDirectory.MaximumLength = g_WindowsDirectory.Length + SdbpStrsize(WINSXS);
g_SxsDirectory.Buffer = SdbpAlloc(g_SxsDirectory.MaximumLength);
RtlCopyUnicodeString(&g_SxsDirectory, &g_WindowsDirectory);
RtlAppendUnicodeToString(&g_SxsDirectory, WINSXS);
#undef SYSTEM32
#undef WINSXS
}
VOID SeiSetEntryProcessed(PPEB Peb)
{
PLIST_ENTRY ListHead, Entry;
PLDR_DATA_TABLE_ENTRY LdrEntry;
ListHead = &NtCurrentPeb()->Ldr->InInitializationOrderModuleList;
Entry = ListHead->Flink;
while (Entry != ListHead)
{
LdrEntry = CONTAINING_RECORD(Entry, LDR_DATA_TABLE_ENTRY, InInitializationOrderLinks);
Entry = Entry->Flink;
if (RtlEqualUnicodeString(&LdrEntry->BaseDllName, &Ntdll, TRUE) ||
RtlEqualUnicodeString(&LdrEntry->BaseDllName, &Kernel32, TRUE) ||
RtlEqualUnicodeString(&LdrEntry->BaseDllName, &Verifier, TRUE) ||
RtlEqualUnicodeString(&LdrEntry->BaseDllName, &g_LoadingShimDll, TRUE) ||
SE_IsShimDll(LdrEntry->DllBase) ||
(LdrEntry->Flags & LDRP_ENTRY_PROCESSED))
{
SHIMENG_WARN("Don't mess with 0x%p '%wZ'\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
}
else
{
SHIMENG_WARN("Touching 0x%p '%wZ'\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
LdrEntry->Flags |= (LDRP_ENTRY_PROCESSED | LDRP_SHIMENG_SUPPRESSED_ENTRY);
}
}
ListHead = &NtCurrentPeb()->Ldr->InMemoryOrderModuleList;
Entry = ListHead->Flink;
SHIMENG_INFO("In memory:\n");
while (Entry != ListHead)
{
LdrEntry = CONTAINING_RECORD(Entry, LDR_DATA_TABLE_ENTRY, InMemoryOrderLinks);
Entry = Entry->Flink;
SHIMENG_INFO(" 0x%p '%wZ'\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
}
ListHead = &NtCurrentPeb()->Ldr->InLoadOrderModuleList;
Entry = ListHead->Flink;
SHIMENG_INFO("In load:\n");
while (Entry != ListHead)
{
LdrEntry = CONTAINING_RECORD(Entry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks);
Entry = Entry->Flink;
SHIMENG_INFO(" 0x%p '%wZ'\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
}
}
VOID SeiResetEntryProcessed(PPEB Peb)
{
PLIST_ENTRY ListHead, Entry;
PLDR_DATA_TABLE_ENTRY LdrEntry;
ListHead = &NtCurrentPeb()->Ldr->InInitializationOrderModuleList;
Entry = ListHead->Flink;
while (Entry != ListHead)
{
LdrEntry = CONTAINING_RECORD(Entry, LDR_DATA_TABLE_ENTRY, InInitializationOrderLinks);
Entry = Entry->Flink;
if (SE_IsShimDll(LdrEntry->DllBase) ||
g_hInstance == LdrEntry->DllBase ||
RtlEqualUnicodeString(&LdrEntry->BaseDllName, &Ntdll, TRUE) ||
RtlEqualUnicodeString(&LdrEntry->BaseDllName, &Kernel32, TRUE) ||
RtlEqualUnicodeString(&LdrEntry->BaseDllName, &Verifier, TRUE) ||
!(LdrEntry->Flags & LDRP_SHIMENG_SUPPRESSED_ENTRY))
{
SHIMENG_WARN("Don't mess with 0x%p '%wZ'\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
}
else
{
SHIMENG_WARN("Resetting 0x%p '%wZ'\n", LdrEntry->DllBase, &LdrEntry->BaseDllName);
LdrEntry->Flags &= ~(LDRP_ENTRY_PROCESSED | LDRP_SHIMENG_SUPPRESSED_ENTRY);
}
}
}
VOID SeiInit(PUNICODE_STRING ProcessImage, HSDB hsdb, SDBQUERYRESULT* pQuery)
{
DWORD n;
ARRAY ShimRefArray;
DWORD dwTotalHooks = 0;
FLAGINFO ShimFlags;
PPEB Peb = NtCurrentPeb();
/* We should only be called once! */
ASSERT(g_pShimInfo.ItemSize__ == 0);
ARRAY_Init(&ShimRefArray, TAGREF);
ARRAY_Init(&g_pShimInfo, PSHIMMODULE);
ARRAY_Init(&g_pHookArray, HOOKMODULEINFO);
ARRAY_Init(&g_InExclude, INEXCLUDE);
RtlZeroMemory(&ShimFlags, sizeof(ShimFlags));
SeiInitPaths();
SeiCheckComPlusImage(Peb->ImageBaseAddress);
/* Mark all modules loaded until now as 'LDRP_ENTRY_PROCESSED' so that their entrypoint is not called while we are loading shims */
SeiSetEntryProcessed(Peb);
/* TODO:
if (pQuery->trApphelp)
SeiDisplayAppHelp(?pQuery->trApphelp?);
*/
SeiDbgPrint(SEI_MSG, NULL, "ShimInfo(ExePath(%wZ))\n", ProcessImage);
SeiBuildShimRefArray(hsdb, pQuery, &ShimRefArray, &ShimFlags);
if (ShimFlags.AppCompatFlags.QuadPart)
{
SeiDbgPrint(SEI_MSG, NULL, "Using KERNEL apphack flags 0x%I64x\n", ShimFlags.AppCompatFlags.QuadPart);
Peb->AppCompatFlags.QuadPart |= ShimFlags.AppCompatFlags.QuadPart;
}
if (ShimFlags.AppCompatFlagsUser.QuadPart)
{
SeiDbgPrint(SEI_MSG, NULL, "Using USER apphack flags 0x%I64x\n", ShimFlags.AppCompatFlagsUser.QuadPart);
Peb->AppCompatFlagsUser.QuadPart |= ShimFlags.AppCompatFlagsUser.QuadPart;
}
if (ShimFlags.ProcessParameters_Flags)
{
SeiDbgPrint(SEI_MSG, NULL, "Using ProcessParameters flags 0x%x\n", ShimFlags.ProcessParameters_Flags);
Peb->ProcessParameters->Flags |= ShimFlags.ProcessParameters_Flags;
}
SeiDbgPrint(SEI_MSG, NULL, "ShimInfo(Complete)\n");
SHIMENG_INFO("Got %d shims\n", ARRAY_Size(&ShimRefArray));
SeiBuildGlobalInclExclList(hsdb);
/* Walk all shims referenced (in layers + exes), and load their modules */
for (n = 0; n < ARRAY_Size(&ShimRefArray); ++n)
{
PDB pdb;
TAGID ShimRef;
TAGREF tr = *ARRAY_At(&ShimRefArray, TAGREF, n);
if (SdbTagRefToTagID(hsdb, tr, &pdb, &ShimRef))
{
LPCWSTR ShimName, DllName, CommandLine = NULL;
TAGID ShimTag;
WCHAR FullNameBuffer[MAX_PATH];
UNICODE_STRING UnicodeDllName;
PVOID BaseAddress;
PSHIMMODULE pShimModuleInfo = NULL;
ANSI_STRING AnsiCommandLine = RTL_CONSTANT_STRING("");
PSHIMINFO pShimInfo = NULL;
PHOOKAPIEX pHookApi;
DWORD dwHookCount;
ShimName = SeiGetStringPtr(pdb, ShimRef, TAG_NAME);
if (!ShimName)
{
SHIMENG_FAIL("Failed to retrieve the name for 0x%x\n", tr);
continue;
}
CommandLine = SeiGetStringPtr(pdb, ShimRef, TAG_COMMAND_LINE);
if (CommandLine && *CommandLine)
{
RtlInitUnicodeString(&UnicodeDllName, CommandLine);
if (NT_SUCCESS(RtlUnicodeStringToAnsiString(&AnsiCommandLine, &UnicodeDllName, TRUE)))
{
SHIMENG_INFO("COMMAND LINE %s for %S", AnsiCommandLine.Buffer, ShimName);
}
else
{
AnsiCommandLine.Buffer = "";
CommandLine = NULL;
}
}
ShimTag = SeiGetDWORD(pdb, ShimRef, TAG_SHIM_TAGID);
if (!ShimTag)
{
SHIMENG_FAIL("Failed to resolve %S to a shim\n", ShimName);
continue;
}
if (!SUCCEEDED(SdbGetAppPatchDir(NULL, FullNameBuffer, ARRAYSIZE(FullNameBuffer))))
{
SHIMENG_WARN("Failed to get the AppPatch dir\n");
continue;
}
DllName = SeiGetStringPtr(pdb, ShimTag, TAG_DLLFILE);
if (DllName == NULL ||
!SUCCEEDED(StringCchCatW(FullNameBuffer, ARRAYSIZE(FullNameBuffer), L"\\")) ||
!SUCCEEDED(StringCchCatW(FullNameBuffer, ARRAYSIZE(FullNameBuffer), DllName)))
{
SHIMENG_WARN("Failed to build a full path for %S\n", ShimName);
continue;
}
RtlInitUnicodeString(&g_LoadingShimDll, DllName);
RtlInitUnicodeString(&UnicodeDllName, FullNameBuffer);
if (NT_SUCCESS(LdrGetDllHandle(NULL, NULL, &UnicodeDllName, &BaseAddress)))
{
/* This shim dll was already loaded, let's find it */
pShimModuleInfo = SeiGetShimModuleInfo(BaseAddress);
}
else if (!NT_SUCCESS(LdrLoadDll(NULL, NULL, &UnicodeDllName, &BaseAddress)))
{
SHIMENG_WARN("Failed to load %wZ for %S\n", &UnicodeDllName, ShimName);
continue;
}
RtlInitUnicodeString(&g_LoadingShimDll, NULL);
/* No shim module found (or we just loaded it) */
if (!pShimModuleInfo)
{
pShimModuleInfo = SeiCreateShimModuleInfo(DllName, BaseAddress);
if (!pShimModuleInfo)
{
SHIMENG_FAIL("Failed to allocate ShimInfo for %S\n", DllName);
continue;
}
}
SHIMENG_INFO("Shim DLL 0x%p \"%wZ\" loaded\n", BaseAddress, &UnicodeDllName);
SHIMENG_INFO("Using SHIM \"%S!%S\"\n", DllName, ShimName);
/* Ask this shim what hooks it needs (and pass along the commandline) */
dwHookCount = 0;
pHookApi = pShimModuleInfo->pGetHookAPIs(AnsiCommandLine.Buffer, ShimName, &dwHookCount);
SHIMENG_INFO("GetHookAPIs returns %d hooks for DLL \"%wZ\" SHIM \"%S\"\n", dwHookCount, &UnicodeDllName, ShimName);
if (dwHookCount && pHookApi)
pShimInfo = SeiAppendHookInfo(pShimModuleInfo, pHookApi, dwHookCount, ShimName);
else
dwHookCount = 0;
/* If this shim has hooks, create the include / exclude lists */
if (pShimInfo)
SeiBuildInclExclList(pdb, ShimTag, pShimInfo);
if (CommandLine && *CommandLine)
RtlFreeAnsiString(&AnsiCommandLine);
dwTotalHooks += dwHookCount;
}
}
SeiAddInternalHooks(dwTotalHooks);
SeiCombineHookInfo();
SeiResolveAPIs();
PatchNewModules(Peb);
/* Remove the 'LDRP_ENTRY_PROCESSED' flag from entries we modified, so that the loader can continue to process them */
SeiResetEntryProcessed(Peb);
}
/* Load the database + unpack the shim data (if this process is allowed) */
BOOL SeiGetShimData(PUNICODE_STRING ProcessImage, PVOID pShimData, HSDB* pHsdb, SDBQUERYRESULT* pQuery)
{
static const UNICODE_STRING ForbiddenShimmingApps[] = {
RTL_CONSTANT_STRING(L"ntsd.exe"),
RTL_CONSTANT_STRING(L"windbg.exe"),
#if WINVER >= 0x600
RTL_CONSTANT_STRING(L"slsvc.exe"),
#endif
};
static const UNICODE_STRING PathDividerFind = RTL_CONSTANT_STRING(L"\\/");
UNICODE_STRING ProcessName;
USHORT PathDivider;
HSDB hsdb;
DWORD n;
if (!NT_SUCCESS(RtlFindCharInUnicodeString(RTL_FIND_CHAR_IN_UNICODE_STRING_START_AT_END, ProcessImage, &PathDividerFind, &PathDivider)))
PathDivider = 0;
if (PathDivider)
PathDivider += sizeof(WCHAR);
ProcessName.Buffer = ProcessImage->Buffer + PathDivider / sizeof(WCHAR);
ProcessName.Length = ProcessImage->Length - PathDivider;
ProcessName.MaximumLength = ProcessImage->MaximumLength - PathDivider;
for (n = 0; n < ARRAYSIZE(ForbiddenShimmingApps); ++n)
{
if (RtlEqualUnicodeString(&ProcessName, ForbiddenShimmingApps + n, TRUE))
{
SHIMENG_MSG("Not shimming %wZ\n", ForbiddenShimmingApps + n);
return FALSE;
}
}
/* We should probably load all db's here, but since we do not support that yet... */
hsdb = SdbInitDatabase(HID_DOS_PATHS | SDB_DATABASE_MAIN_SHIM, NULL);
if (hsdb)
{
if (SdbUnpackAppCompatData(hsdb, ProcessImage->Buffer, pShimData, pQuery))
{
*pHsdb = hsdb;
return TRUE;
}
SdbReleaseDatabase(hsdb);
}
return FALSE;
}
VOID NTAPI SE_InstallBeforeInit(PUNICODE_STRING ProcessImage, PVOID pShimData)
{
HSDB hsdb = NULL;
SDBQUERYRESULT QueryResult = { { 0 } };
SHIMENG_INFO("(%wZ, %p)\n", ProcessImage, pShimData);
if (!SeiGetShimData(ProcessImage, pShimData, &hsdb, &QueryResult))
{
SHIMENG_FAIL("Failed to get shim data\n");
return;
}
g_bShimDuringInit = TRUE;
SeiInit(ProcessImage, hsdb, &QueryResult);
g_bShimDuringInit = FALSE;
SdbReleaseDatabase(hsdb);
}
VOID NTAPI SE_InstallAfterInit(PUNICODE_STRING ProcessImage, PVOID pShimData)
{
NotifyShims(SHIM_NOTIFY_ATTACH, NULL);
}
VOID NTAPI SE_ProcessDying(VOID)
{
SHIMENG_MSG("()\n");
NotifyShims(SHIM_NOTIFY_DETACH, NULL);
}
VOID WINAPI SE_DllLoaded(PLDR_DATA_TABLE_ENTRY LdrEntry)
{
PHOOKMODULEINFO HookModuleInfo;
SHIMENG_INFO("%sINIT. loading DLL \"%wZ\"\n", g_bShimDuringInit ? "" : "AFTER ", &LdrEntry->BaseDllName);
HookModuleInfo = SeiFindHookModuleInfo(&LdrEntry->BaseDllName, NULL);
if (HookModuleInfo)
{
ASSERT(HookModuleInfo->BaseAddress == NULL);
HookModuleInfo->BaseAddress = LdrEntry->DllBase;
SeiResolveAPI(HookModuleInfo);
}
SeiHookImports(LdrEntry);
NotifyShims(SHIM_REASON_DLL_LOAD, LdrEntry);
}
VOID WINAPI SE_DllUnloaded(PLDR_DATA_TABLE_ENTRY LdrEntry)
{
SHIMENG_INFO("(%p)\n", LdrEntry);
/* Should we unhook here? */
NotifyShims(SHIM_REASON_DLL_UNLOAD, LdrEntry);
}
BOOL WINAPI SE_IsShimDll(PVOID BaseAddress)
{
SHIMENG_INFO("(%p)\n", BaseAddress);
return SeiGetShimModuleInfo(BaseAddress) != NULL;
}
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