恢复 SSDT

admin · 发表于 2009-12-12 23:49:53

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// 只贴 ring3 部分，这也是最主要的代码，驱动只是负责把得到的原始值写到 ssdt，其他啥也不做
// 简单说一下，找 KiServiceTable 表过程，是直接读取原始内核文件，寻找输出符号，然后结合重定位信息，谁向 KeServiceDescriptorTable 赋值，从而确定 KiServiceTable 的位置。
// 这是第一写驱动相关的代码，写的很挫，高手就不用看了。

#include <tchar.h>
#include <Windows.h>
#include <winioctl.h>
#include "RSSDT.h"
/*
// RSSDT.h
typedef struct _tagSST_ENTRY
{
ULONG cbSize;
ULONG Index;
ULONG OrgValue; // 类型 RVA, 传给驱动的时做 Set Value
ULONG NowValue; // 类型 RVA, 传给驱动做 get value
} SST_ENTRY, *PSST_ENTRY;
#define IOCTL_RSSDT_ENTRY_SET CTL_CODE(FILE_DEVICE_UNKNOWN, 0x801, METHOD_BUFFERED, FILE_ANY_ACCESS)
*/
ULONG Rav2Raw(PVOID pFileData, ULONG rav)
{
PIMAGE_DOS_HEADER pDosH;
PIMAGE_NT_HEADERS pNtH;
PIMAGE_SECTION_HEADER pSectH;
ULONG Index;
pDosH = (PIMAGE_DOS_HEADER)pFileData;
pNtH = (PIMAGE_NT_HEADERS)((ULONG)pFileData + pDosH->e_lfanew);
pSectH = IMAGE_FIRST_SECTION(pNtH);
if ( rav >= 0 && rav < pSectH->VirtualAddress )
return rav;
for ( Index = 0; Index < pNtH->FileHeader.NumberOfSections; Index++ )
{
if ( rav >= pSectH->VirtualAddress && rav < pSectH->VirtualAddress + pSectH->Misc.VirtualSize )
return rav - pSectH->VirtualAddress + pSectH->PointerToRawData;
pSectH++;
}
return (ULONG)-1;
}
PVOID NTAPI
GetImageDirEntry(
IN ULONG ImageBase,
IN ULONG DirIndex,
OUT OPTIONAL PIMAGE_NT_HEADERS* ppNtH,
OUT OPTIONAL PIMAGE_DATA_DIRECTORY* ppDataDir
)
{
PIMAGE_DOS_HEADER pDosH;
PIMAGE_NT_HEADERS pNtH;
PIMAGE_DATA_DIRECTORY pDataDir;
pDosH = (PIMAGE_DOS_HEADER)ImageBase;
if ( pDosH->e_magic != IMAGE_DOS_SIGNATURE )
{
return NULL;
}
pNtH = (PIMAGE_NT_HEADERS)(ImageBase + pDosH->e_lfanew);
if ( pNtH->Signature != IMAGE_NT_SIGNATURE )
{
return NULL;
}
if ( ppNtH != NULL )
{
*ppNtH = pNtH;
}
pDataDir = &pNtH->OptionalHeader.DataDirectory[DirIndex];
if ( pDataDir->VirtualAddress == 0 )
{
return NULL;
}
if ( ppDataDir != NULL )
{
*ppDataDir = pDataDir;
}
return (PVOID)(ImageBase + Rav2Raw((PVOID)ImageBase, pDataDir->VirtualAddress));
}
typedef BOOLEAN (NTAPI* LOOPUPXREF_CALLBACK)(PULONG RefAddr, PVOID Param);
ULONG NTAPI // 返回找到的引用个数
pLookupImageXRef(
IN ULONG ImageBase, // 参考地址
IN PIMAGE_DATA_DIRECTORY pBrDir,
IN PIMAGE_BASE_RELOCATION pBr,
IN ULONG SymAddr,
IN LOOPUPXREF_CALLBACK LookupXRefCallback, // 回调
IN PVOID pParam
)
{
ULONG nRefCount = 0;
__try
{
ULONG Size = 0;
while ( pBr->SizeOfBlock != 0 && Size < pBrDir->Size )
{
PWORD pRelItem = (PWORD)(pBr + 1);
PIMAGE_BASE_RELOCATION pNextBr = (PIMAGE_BASE_RELOCATION)((ULONG)pBr + pBr->SizeOfBlock);
while ( (ULONG)pRelItem < (ULONG)pNextBr )
{
ULONG RefBlock = Rav2Raw((PVOID)ImageBase, pBr->VirtualAddress);
if ( (pRelItem[0] >> 12) == 3 )
{
PULONG RefAddr = (PULONG)(ImageBase + RefBlock + (pRelItem[0] & 0x0FFF));
// 验证内存是否有效
if ( !IsBadReadPtr(RefAddr, 1) && RefAddr[0] == SymAddr )
{
nRefCount++;
if ( LookupXRefCallback(RefAddr, pParam) )
break;
}
}
pRelItem++;
}
Size += pBr->SizeOfBlock;
pBr = pNextBr;
}
}
__except ( EXCEPTION_EXECUTE_HANDLER )
{
// DbgPrint("pLookupImageXRef: Found a Exception!\n");
}
return nRefCount;
}
ULONG NTAPI
LookupImageXRef(
IN ULONG ImageBase, // 有效地址
IN ULONG SymAddr,
IN LOOPUPXREF_CALLBACK LookupXRefCallback, // 回调
IN PVOID Param
)
{
if ( LookupXRefCallback != NULL )
{
PIMAGE_DATA_DIRECTORY pBrDir;
PIMAGE_BASE_RELOCATION pBr;
pBr = GetImageDirEntry(ImageBase, IMAGE_DIRECTORY_ENTRY_BASERELOC, NULL, &pBrDir);
if ( pBr != NULL )
{
return pLookupImageXRef(ImageBase, pBrDir, pBr, SymAddr, LookupXRefCallback, Param);
}
}
return 0;
}
typedef struct tag_SYSTEM_SERVICE_TABLE {
PULONG ServiceTable; // array of entry points
PULONG CounterTable; // array of usage counters
ULONG ServiceLimit; // number of table entries
PCHAR ArgumentTable; // array of argument counts
} SYSTEM_SERVICE_TABLE, *PSYSTEM_SERVICE_TABLE, **PPSYSTEM_SERVICE_TABLE;
BOOLEAN WINAPI LookXRefCallback(PULONG pRefAddr, PVOID pParam)
{
USHORT OpCode = *((PUSHORT)pRefAddr - 1);
if ( OpCode == 0x05C7 ) // mov ds:_KeServiceDescriptorTable, offset _KiServiceTable
{
if ( pParam != NULL )
{
*(PULONG)pParam = pRefAddr[1]; // KiServiceTable
}
return FALSE;
}
return TRUE;
}
BOOL GetSSTEntry(PCTSTR pszServiceName, PSST_ENTRY pSSTEntry)
{
HANDLE hFile, hFileMap;
LPVOID pFileData;
HMODULE hNtdll;
FARPROC pfnService;
BOOL bResult;
TCHAR szNtoskrnlPath[MAX_PATH];
hNtdll = GetModuleHandle(_T("ntdll.dll"));
pfnService = GetProcAddress(hNtdll, pszServiceName);
if ( pfnService == NULL || *(PBYTE)pfnService != 0xB8 )
return FALSE;
// mov eax, ??
pSSTEntry->Index = *(PULONG)((PBYTE)pfnService + 1);
GetSystemDirectory(szNtoskrnlPath, MAX_PATH);
_tcscat(szNtoskrnlPath, _T("\\ntoskrnl.exe")); // or ntkrnlpa.exe
hFile = CreateFile(szNtoskrnlPath, GENERIC_READ, FILE_SHARE_WRITE | FILE_SHARE_READ,
NULL, OPEN_EXISTING, 0, NULL);
if ( hFile == INVALID_HANDLE_VALUE )
return FALSE;
hFileMap = CreateFileMapping(hFile, NULL, PAGE_READONLY, 0, 0, NULL);
CloseHandle(hFile);
if ( hFileMap == NULL )
return FALSE;
pFileData = MapViewOfFile(hFileMap, FILE_MAP_READ, 0, 0, 0);
CloseHandle(hFileMap);
if ( NULL == pFileData )
return FALSE;
bResult = FALSE;
__try
{
PIMAGE_DOS_HEADER pDosH;
PIMAGE_NT_HEADERS pNtH;
PIMAGE_EXPORT_DIRECTORY pExpDir;
PULONG pFunName, pFunAddr;
PUSHORT pFunNameOrd;
ULONG Index;
pDosH = (PIMAGE_DOS_HEADER)pFileData;
pNtH = (PIMAGE_NT_HEADERS)((ULONG)pFileData + pDosH->e_lfanew);
pExpDir = (PIMAGE_EXPORT_DIRECTORY)((ULONG)pFileData + pNtH->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress);
pFunName = (PULONG)((ULONG)pFileData + Rav2Raw(pFileData, pExpDir->AddressOfNames));
pFunNameOrd = (PUSHORT)((ULONG)pFileData + Rav2Raw(pFileData, pExpDir->AddressOfNameOrdinals));
pFunAddr = (PULONG)((ULONG)pFileData + Rav2Raw(pFileData, pExpDir->AddressOfFunctions));
for ( Index = 0; Index < pExpDir->NumberOfNames; Index++ )
{
PCSTR pName = (PCSTR)((ULONG)pFileData + Rav2Raw(pFileData, pFunName[Index]));
if ( strcmp(pName, "KeServiceDescriptorTable") == 0 )
{
ULONG _KiServiceTable, _KeServiceDescriptorTable; // 类型都是 va
_KiServiceTable = 0;
_KeServiceDescriptorTable = pNtH->OptionalHeader.ImageBase + pFunAddr[pFunNameOrd[Index]];
LookupImageXRef((ULONG)pFileData, _KeServiceDescriptorTable, LookXRefCallback, &_KiServiceTable);
if ( _KiServiceTable != 0 )
{
PULONG ServiceTable;
_KiServiceTable -= pNtH->OptionalHeader.ImageBase;
ServiceTable = (PULONG)((ULONG)pFileData + Rav2Raw(pFileData, _KiServiceTable));
pSSTEntry->OrgValue = ServiceTable[pSSTEntry->Index] - pNtH->OptionalHeader.ImageBase;
}
bResult = TRUE;
break;
}
}
}
__except ( EXCEPTION_EXECUTE_HANDLER )
{
bResult = FALSE;
}
UnmapViewOfFile(pFileData);
return bResult;
}
HANDLE GetServiceByName(IN PCTSTR pszServiceName, OUT OPTIONAL SC_HANDLE* pScManager)
{
SC_HANDLE hScManager, hScService;
hScService = NULL;
hScManager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
if ( pScManager != NULL )
*pScManager = hScManager;
if ( hScManager != NULL )
{
hScService = OpenService(hScManager, pszServiceName, SERVICE_ALL_ACCESS);
if ( pScManager == NULL )
CloseServiceHandle(hScManager);
}
return hScService;
}
SC_HANDLE InstallDriver(IN PCTSTR pszServiceName, IN PCTSTR pszDriverFile)
{
SC_HANDLE hScManager, hScService;
hScManager = NULL;
hScService = GetServiceByName(pszServiceName, &hScManager);
if ( hScService == NULL && hScManager != NULL )
{
hScService = CreateService(hScManager, pszServiceName, pszServiceName, SERVICE_ALL_ACCESS,
SERVICE_KERNEL_DRIVER, SERVICE_DEMAND_START, SERVICE_ERROR_NORMAL, pszDriverFile, NULL,
NULL, NULL, NULL, NULL
);
// GetLastError();
}
if ( hScManager != NULL )
CloseServiceHandle(hScManager);
return hScService;
}
BOOL UninstallDriver(SC_HANDLE hScService)
{
SERVICE_STATUS Status;
if ( ControlService(hScService, SERVICE_CONTROL_STOP, &Status) )
{
DeleteService(hScService);
CloseServiceHandle(hScService);
return TRUE;
}
// GetLastError();
return FALSE;
}
BOOL ResetSSTEntry(PCSTR lpServiceName)
{
SC_HANDLE hScService;
HANDLE hDevice;
SST_ENTRY SstEntry;
ULONG cbReturn;
TCHAR szDriverPath[MAX_PATH];
PTSTR pszDriverName;
BOOL bResult;
SstEntry.cbSize = sizeof (SST_ENTRY);
if ( !GetSSTEntry(lpServiceName, &SstEntry) )
return FALSE;
GetModuleFileName(NULL, szDriverPath, MAX_PATH);
pszDriverName = _tcsrchr(szDriverPath, _T('\\'));
_tcscpy(pszDriverName, _T("\\RSSDT.sys"));
hScService = GetServiceByName(_T("RSSDT"), NULL);
if ( hScService == NULL )
{
hScService = InstallDriver(_T("RSSDT"), szDriverPath);
if ( hScService == NULL )
return FALSE;
}
bResult = FALSE;
if ( StartService(hScService, 0, NULL) || GetLastError() == ERROR_ALREADY_EXISTS )
{
hDevice = CreateFile(_T("\\\\.\\RSSDT"),
GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
0,
NULL
);
GetLastError();
if ( hDevice != INVALID_HANDLE_VALUE )
{
bResult = DeviceIoControl(hDevice, IOCTL_RSSDT_ENTRY_SET, &SstEntry, sizeof (SstEntry),
&SstEntry, sizeof (SstEntry), &cbReturn, NULL);
CloseHandle(hDevice);
}
}
UninstallDriver(hScService);
return bResult;
}
#if 1
int __cdecl main()
{
ResetSSTEntry("NtCreateKey");
ResetSSTEntry("NtCreatePagingFile");
ResetSSTEntry("NtEnumerateValueKey");
ResetSSTEntry("NtOpenKey");
ResetSSTEntry("NtQueryKey");
ResetSSTEntry("NtQueryValueKey");
ResetSSTEntry("NtSetSystemPowerState");
return 0;
}
#endif

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