forked from Public-Mirror/Textractor
90 lines
3.4 KiB
C++
90 lines
3.4 KiB
C++
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// hijack.cc
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// 1/27/2013 jichi
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#include "windbg/hijack.h"
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#include "windbg/windbg_p.h"
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#ifdef _MSC_VER
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# pragma warning (disable:4996) // C4996: use POSIX function (stricmp)
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#endif // _MSC_VER
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//#define DEBUG "winsec"
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#include "sakurakit/skdebug.h"
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WINDBG_BEGIN_NAMESPACE
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// - Inline Hook -
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// See: http://asdf.wkeya.com/code/apihook6.html
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PVOID overrideFunctionA(HMODULE stealFrom, LPCSTR oldFunctionModule, LPCSTR functionName, LPCVOID newFunction)
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{
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if (!stealFrom)
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return nullptr;
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//HMODULE oldModule = GetModuleHandleA(oldFunctionModule);
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//if (!oldModule)
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// return nullptr;
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//void *originalAddress = GetProcAddress(oldModule, functionName);
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LPVOID originalAddress = details::getModuleFunctionAddressA(functionName, oldFunctionModule);
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if (!originalAddress)
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return nullptr;
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IMAGE_DOS_HEADER *dosHeader = reinterpret_cast<IMAGE_DOS_HEADER *>(stealFrom);
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char *base = reinterpret_cast<char *>(stealFrom);
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if (::IsBadReadPtr(dosHeader, sizeof(IMAGE_DOS_HEADER)) || dosHeader->e_magic != IMAGE_DOS_SIGNATURE)
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return nullptr;
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IMAGE_NT_HEADERS *ntHeader =
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reinterpret_cast<IMAGE_NT_HEADERS* >(base + dosHeader->e_lfanew);
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if (::IsBadReadPtr(ntHeader, sizeof(IMAGE_NT_HEADERS)) || ntHeader->Signature != IMAGE_NT_SIGNATURE)
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return nullptr;
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if (!ntHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress)
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return nullptr;
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// See: http://msdn.microsoft.com/en-us/magazine/cc301808.aspx
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IMAGE_IMPORT_DESCRIPTOR *import =
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reinterpret_cast<IMAGE_IMPORT_DESCRIPTOR *>(base + ntHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress);
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// scan memory
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// TODO: add a maximum loop counter here!
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while (import->Name) {
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char *name = base + import->Name;
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if (!::stricmp(name, oldFunctionModule))
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break;
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import++;
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}
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if (!import->Name)
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return nullptr;
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IMAGE_THUNK_DATA *thunk = reinterpret_cast<IMAGE_THUNK_DATA *>(base + import->FirstThunk);
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while (thunk->u1.Function) {
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if ((ULONG_PTR)thunk->u1.Function == (ULONG_PTR)originalAddress) {
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ULONG_PTR *addr = reinterpret_cast<ULONG_PTR *>(&thunk->u1.Function);
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// See: http://asdf.wkeya.com/code/apihook6.html
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// Inline hook mechanism:
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//
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// LPVOID InlineHook3( PUINT8 mem, DWORD dwLen, PUINT8 pfOld, PUINT8 pfNew )
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// {
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// DWORD dwOldProtect;
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// VirtualProtect( ( PUINT8 )( pfOld ), dwLen, PAGE_READWRITE, &dwOldProtect );
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// // 関数のエントリーから指定したbyte数をメモリの前方にコピー
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// // メモリの数byte後方からオリジナルへのジャンプを作成
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// // 指定の関数アドレスから5byteをフックへのjmp命令に書き換え
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// VirtualProtect( ( PUINT8 )( pfOld ), dwLen, dwOldProtect, &dwOldProtect );
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// return ( PVOID )mem;
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// }
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MEMORY_BASIC_INFORMATION mbi;
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if (::VirtualQuery((LPVOID)addr, &mbi, sizeof(mbi)) == sizeof(mbi)) {
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DWORD dwOldProtect;
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if (::VirtualProtect(mbi.BaseAddress, ((ULONG_PTR)addr + 8)-(ULONG_PTR)mbi.BaseAddress, PAGE_EXECUTE_READWRITE, &dwOldProtect)) {
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*addr = (ULONG_PTR)newFunction;
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::VirtualProtect(mbi.BaseAddress, ((ULONG_PTR)addr + 8)-(ULONG_PTR)mbi.BaseAddress, dwOldProtect, &dwOldProtect);
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return originalAddress;
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}
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}
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}
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thunk++;
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}
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return nullptr;
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}
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WINDBG_END_NAMESPACE
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// EOF
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