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// Checksum Tool
// By Bio (C) 2012
#include "common.h"
// Return codes
#define RESULT_OK 0
#define RESULT_NOTFOUND 10
#define RESULT_READERROR 20
#define RESULT_NOTPE 30
#define RESULT_CORRUPTED 40
#define RESULT_INVALID 50
#define RESULT_NONE 100
#define DEBUG_SECTIONS 1
#define DEBUG_REALLOCS 1
int debug = 0;
static void PatchResourcesDirectory(PIMAGE_RESOURCE_DIRECTORY pIRD, BYTE* pBase);
static void PatchResourceEntry(PIMAGE_RESOURCE_DIRECTORY_ENTRY pIRDE, BYTE* pBase)
{
if ( pIRDE->DataIsDirectory )
PatchResourcesDirectory( PIMAGE_RESOURCE_DIRECTORY(pBase + pIRDE->OffsetToDirectory), pBase);
}
static void PatchResourcesDirectory(PIMAGE_RESOURCE_DIRECTORY pIRD, PBYTE pBase)
{
UINT i;
pIRD->TimeDateStamp = 0;
PIMAGE_RESOURCE_DIRECTORY_ENTRY pIRDE = PIMAGE_RESOURCE_DIRECTORY_ENTRY(pIRD+1);
for ( i=0; i < pIRD->NumberOfNamedEntries; i++, pIRDE++ )
PatchResourceEntry(pIRDE, pBase);
for ( i=0; i < pIRD->NumberOfIdEntries; i++, pIRDE++ )
PatchResourceEntry(pIRDE, pBase);
}
int CalculateModuleHash(const TCHAR *filename, char* szDest)
{
HANDLE hFile = INVALID_HANDLE_VALUE;
HANDLE hMap;
PBYTE ptr = 0;
int res = RESULT_OK;
DWORD filesize;
DWORD hsize = 0;
WORD machine = 0;
DWORD sections = 0;
hFile = CreateFile( filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL );
if ( hFile == INVALID_HANDLE_VALUE )
return RESULT_NOTFOUND;
// check minimum and maximum size
filesize = GetFileSize( hFile, &hsize );
if ( !filesize || filesize == INVALID_FILE_SIZE || hsize )
{
CloseHandle( hFile );
return RESULT_INVALID;
}
if ( filesize < sizeof(IMAGE_DOS_HEADER) + sizeof(IMAGE_NT_HEADERS))
{
CloseHandle( hFile );
return RESULT_NOTPE;
}
hMap = CreateFileMapping( hFile, NULL, PAGE_WRITECOPY, 0, 0, NULL );
if ( hMap )
ptr = (PBYTE)MapViewOfFile( hMap, FILE_MAP_COPY, 0, 0 ,0 );
if ( ptr )
{
PIMAGE_DOS_HEADER pIDH = 0;
PIMAGE_NT_HEADERS pINTH = 0;
pIDH = (PIMAGE_DOS_HEADER)ptr;
if ( pIDH->e_magic == IMAGE_DOS_SIGNATURE )
pINTH = (PIMAGE_NT_HEADERS)( ptr + pIDH->e_lfanew );
if ( !pINTH)
res = RESULT_NOTPE;
else
if ((PBYTE)pINTH + sizeof(IMAGE_NT_HEADERS) >= ptr + filesize )
res = RESULT_CORRUPTED;
else
if ( pINTH->Signature != IMAGE_NT_SIGNATURE )
res = RESULT_NOTPE;
else
{
machine = pINTH->FileHeader.Machine;
sections = pINTH->FileHeader.NumberOfSections;
if ( !sections )
res = RESULT_INVALID;
else
{
PIMAGE_DATA_DIRECTORY pIDD = 0;
PIMAGE_DEBUG_DIRECTORY pDBG = 0;
DWORD dbgSize = 0, dbgAddr = 0; // debug information
DWORD expSize = 0, expAddr = 0; // export table
DWORD resSize = 0, resAddr = 0; // resource directory
DWORD relocSize = 0, relocAddr = 0; // relocation table
PBYTE pRealloc = 0;
DWORD offset;
ULONGLONG base = 0;
// try to found correct offset independent of architectures
offset = pIDH->e_lfanew + pINTH->FileHeader.SizeOfOptionalHeader + sizeof(IMAGE_NT_HEADERS) - sizeof(IMAGE_OPTIONAL_HEADER);
if (( machine == IMAGE_FILE_MACHINE_I386 ) &&
( pINTH->FileHeader.SizeOfOptionalHeader >= sizeof(IMAGE_OPTIONAL_HEADER32)) &&
( pINTH->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC ))
{
pIDD = (PIMAGE_DATA_DIRECTORY)((PBYTE)pINTH + offsetof( IMAGE_NT_HEADERS32, OptionalHeader.DataDirectory ));
base = *(DWORD*)((PBYTE)pINTH + offsetof( IMAGE_NT_HEADERS32, OptionalHeader.ImageBase ));
}
else if (( machine == IMAGE_FILE_MACHINE_AMD64 ) &&
( pINTH->FileHeader.SizeOfOptionalHeader >= sizeof(IMAGE_OPTIONAL_HEADER64)) &&
( pINTH->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC ))
{
pIDD = (PIMAGE_DATA_DIRECTORY)((PBYTE)pINTH + offsetof( IMAGE_NT_HEADERS64, OptionalHeader.DataDirectory ));
base = *(ULONGLONG*)((PBYTE)pINTH + offsetof( IMAGE_NT_HEADERS64, OptionalHeader.ImageBase ));
}
else res = RESULT_CORRUPTED;
if ( pIDD ) {
// Debugging information entry
dbgAddr = pIDD[IMAGE_DIRECTORY_ENTRY_DEBUG].VirtualAddress;
dbgSize = pIDD[IMAGE_DIRECTORY_ENTRY_DEBUG].Size;
// Export information entry
expAddr = pIDD[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress;
expSize = pIDD[IMAGE_DIRECTORY_ENTRY_EXPORT].Size;
// Resource directory
resAddr = pIDD[IMAGE_DIRECTORY_ENTRY_RESOURCE].VirtualAddress;
resSize = pIDD[IMAGE_DIRECTORY_ENTRY_RESOURCE].Size;
// Reallocation information entry
relocAddr = pIDD[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress;
relocSize = pIDD[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size;
}
// verify image integrity
for (DWORD idx=0; idx < sections; idx++)
{
PIMAGE_SECTION_HEADER pISH = (PIMAGE_SECTION_HEADER)( ptr + offset + idx * sizeof(IMAGE_SECTION_HEADER));
if (((PBYTE)pISH + sizeof(IMAGE_SECTION_HEADER) > ptr + filesize ) || ( pISH->PointerToRawData + pISH->SizeOfRawData > filesize ))
{
res = RESULT_CORRUPTED;
break;
}
// erase timestamp
if (( dbgSize >= sizeof( IMAGE_DEBUG_DIRECTORY )) &&
( dbgAddr >= pISH->VirtualAddress ) &&
( dbgAddr + dbgSize <= pISH->VirtualAddress + pISH->SizeOfRawData ))
{
DWORD shift = dbgAddr - pISH->VirtualAddress;
pDBG = (PIMAGE_DEBUG_DIRECTORY)( ptr + shift + pISH->PointerToRawData );
memset(pDBG, 0, pDBG->SizeOfData);
}
// erase export timestamp
if (( expSize >= sizeof( IMAGE_EXPORT_DIRECTORY )) &&
( expAddr >= pISH->VirtualAddress ) &&
( expAddr + expSize <= pISH->VirtualAddress + pISH->SizeOfRawData ))
{
DWORD shift = expAddr - pISH->VirtualAddress;
PIMAGE_EXPORT_DIRECTORY pEXP = (PIMAGE_EXPORT_DIRECTORY)( ptr + shift + pISH->PointerToRawData );
pEXP->TimeDateStamp = 0;
}
// find realocation table
if (( relocSize >= sizeof( IMAGE_BASE_RELOCATION )) &&
( relocAddr >= pISH->VirtualAddress ) &&
( relocAddr + relocSize <= pISH->VirtualAddress + pISH->SizeOfRawData ))
{
DWORD shift = relocAddr - pISH->VirtualAddress;
pRealloc = ptr + shift + pISH->PointerToRawData;
}
}
if ( res == RESULT_OK )
{
mir_md5_state_t pms;
mir_md5_init( &pms );
for (size_t idx=0; idx < sections; idx++)
{
PIMAGE_SECTION_HEADER pISH = (PIMAGE_SECTION_HEADER)( ptr + offset + idx * sizeof(IMAGE_SECTION_HEADER));
if (((PBYTE)pISH + sizeof(IMAGE_SECTION_HEADER) > ptr + filesize ) || ( pISH->PointerToRawData + pISH->SizeOfRawData > filesize ))
{
res = RESULT_CORRUPTED;
break;
}
// erase debug information
if ( pDBG && pDBG->SizeOfData > 0 &&
pDBG->PointerToRawData >= pISH->PointerToRawData &&
pDBG->PointerToRawData + pDBG->SizeOfData <= pISH->PointerToRawData + pISH->SizeOfRawData )
{
ZeroMemory( ptr + pDBG->PointerToRawData, pDBG->SizeOfData );
}
// patch resources
if ( resSize > 0 && resAddr >= pISH->VirtualAddress && resAddr + resSize <= pISH->VirtualAddress + pISH->SizeOfRawData )
{
DWORD shift = resAddr - pISH->VirtualAddress + pISH->PointerToRawData;
IMAGE_RESOURCE_DIRECTORY* pIRD = (IMAGE_RESOURCE_DIRECTORY*)( ptr + shift );
PatchResourcesDirectory(pIRD, ptr + shift);
}
// rebase to zero address
if ( pRealloc )
{
DWORD blocklen = relocSize;
PWORD pw;
DWORD type;
int len;
PBYTE pAddr;
DWORD shift;
DWORD addr;
PIMAGE_BASE_RELOCATION pIBR = (PIMAGE_BASE_RELOCATION)pRealloc;
while( pIBR )
{
if (( pIBR->VirtualAddress >= pISH->VirtualAddress ) &&
( pIBR->VirtualAddress < pISH->VirtualAddress + pISH->SizeOfRawData ) &&
( pIBR->SizeOfBlock <= blocklen ))
{
shift = pIBR->VirtualAddress - pISH->VirtualAddress + pISH->PointerToRawData;
len = pIBR->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION);
pw = (PWORD)((PBYTE)pIBR + sizeof(IMAGE_BASE_RELOCATION));
while( len > 0 )
{
type = *pw >> 12;
addr = ( *pw & 0x0FFF );
pAddr = ptr + shift + addr;
switch( type ) {
case IMAGE_REL_BASED_HIGHLOW:
if ( addr + pIBR->VirtualAddress + sizeof(DWORD) >= pISH->VirtualAddress + pISH->SizeOfRawData )
{
len = 0;
break;
}
*(PDWORD)pAddr = (DWORD)((*(PDWORD)pAddr) - (DWORD)base );
break;
case IMAGE_REL_BASED_DIR64:
if ( addr + pIBR->VirtualAddress + sizeof(ULONGLONG) >= pISH->VirtualAddress + pISH->SizeOfRawData )
{
len = 0;
break;
}
*(ULONGLONG*)pAddr = (ULONGLONG)((*(ULONGLONG*)pAddr) - base );
break;
case IMAGE_REL_BASED_ABSOLUTE:
// stop processing
len = 0;
break;
case IMAGE_REL_BASED_HIGH:
case IMAGE_REL_BASED_LOW:
case IMAGE_REL_BASED_HIGHADJ:
break;
}
len -= sizeof(WORD);
pw++;
}
}
blocklen -= pIBR->SizeOfBlock;
if ( blocklen > sizeof(IMAGE_BASE_RELOCATION))
pIBR = (PIMAGE_BASE_RELOCATION)((PBYTE)pIBR + pIBR->SizeOfBlock );
else
break;
}
}
mir_md5_append( &pms, ptr + pISH->PointerToRawData, pISH->SizeOfRawData );
}
if ( res == RESULT_OK ) {
BYTE digest[16];
mir_md5_finish(&pms, digest);
for (int i=0; i < sizeof(digest); i++)
sprintf(szDest + i*2, "%02x", digest[i]);
}
}
}
}
}
else res = RESULT_READERROR;
if ( ptr )
UnmapViewOfFile( ptr );
if ( hMap )
CloseHandle( hMap );
CloseHandle( hFile );
return res;
}
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