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140 lines
3.4 KiB
C++
140 lines
3.4 KiB
C++
/*
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Copyright 2016 Peter Repukat - FlatspotSoftware
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "EnforceBindings.h"
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//stuff for finding the function as well as the injected code
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//should probably be moved somewhere else
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DWORD address = 0x381FA91B;
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DWORD JMPBack;
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int32_t currentBindings;
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const int32_t desktopBindingsID = 413080; //desktop_config appid
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const int32_t bigPictureBindingsID = 413090; //desktop_config appid
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const int32_t steamChordBindingsID = 443510; //desktop_config appid
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int32_t enforceBindingsID = 413080; //0x80000009;
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char originalBytes[] = "\x8B\x45\x0c\x57\x8B\x7D\x08";
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__declspec(naked) void enforceBindingsHookFn()
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{
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__asm
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{
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mov eax, dword ptr ss : [ebp + 0xc]
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mov currentBindings, eax
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}
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if (currentBindings != desktopBindingsID
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&& currentBindings != bigPictureBindingsID
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&& currentBindings != steamChordBindingsID)
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{
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enforceBindingsID = currentBindings;
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}
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if (currentBindings == desktopBindingsID)
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{
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__asm
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{
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mov eax, enforceBindingsID
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}
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}
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__asm
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{
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push edi
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mov edi, dword ptr ss : [ebp + 0x8]
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jmp[JMPBack]
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}
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}
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//\\\
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void EnforceBindings::patchBytes()
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{
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address = FindPattern("steamclient.dll", originalBytes, "xxxxxxx");
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JMPBack = address + 0x7; //7 size of pattern/mask == patched instructions
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PlaceJMP((BYTE*)address, (DWORD)enforceBindingsHookFn, 7);
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}
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void EnforceBindings::Unpatch()
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{
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RestoreBytes((BYTE*)address, (BYTE*)originalBytes, 7);
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}
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void EnforceBindings::PlaceJMP(BYTE * Address, DWORD jumpTo, DWORD lenght)
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{
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DWORD dwOldProtect, dwBkup, dwReloadAddr;
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VirtualProtect(Address, lenght, PAGE_EXECUTE_READWRITE, &dwOldProtect);
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dwReloadAddr = (jumpTo - (DWORD)Address) - 5; //5 == lenght of jump instruction (1byte + 4byte address)
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*Address = 0xE9; //jmp instrcution
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*((DWORD*)(Address + 0x1)) = dwReloadAddr;
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for (DWORD x = 5; x < lenght; x++)
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*(Address + x) = 0x90; //nop the rest
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VirtualProtect(Address, lenght, dwOldProtect, &dwBkup);
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}
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void EnforceBindings::RestoreBytes(BYTE * Address, BYTE * original, DWORD lenght)
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{
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DWORD dwOldProtect, dwBkup, dwReloadAddr;
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VirtualProtect(Address, lenght, PAGE_EXECUTE_READWRITE, &dwOldProtect);
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for (DWORD x = 0; x < lenght; x++)
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{
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*(Address + x) = *(original + x);
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}
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VirtualProtect(Address, lenght, dwOldProtect, &dwBkup);
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}
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MODULEINFO EnforceBindings::GetModInfo(char * szModule)
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{
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MODULEINFO ret = { NULL };
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HMODULE mod = GetModuleHandleA(szModule);
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if (mod != 0)
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GetModuleInformation(GetCurrentProcess(), mod, &ret, sizeof(MODULEINFO));
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return ret;
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}
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DWORD EnforceBindings::FindPattern(char * module, char * pattern, char * mask)
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{
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MODULEINFO mInfo = GetModInfo(module);
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DWORD baseAddr = (DWORD)mInfo.lpBaseOfDll;
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DWORD size = mInfo.SizeOfImage;
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DWORD patLenght = strlen(mask);
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for (DWORD i = 0; i < size - patLenght; i++) //bad for loop btw...
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{
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bool found = true;
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for (DWORD j = 0; j < patLenght; j++)
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found &= mask[j] == '?' || pattern[j] == *(char*)(baseAddr + j + i);
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if (found)
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return baseAddr + i;
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}
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return NULL;
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}
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