mirror of
https://github.com/Artikash/Textractor.git
synced 2024-12-23 17:04:12 +08:00
287 lines
10 KiB
C++
287 lines
10 KiB
C++
#include "hookfinder.h"
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#include "defs.h"
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#include "main.h"
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#include "util.h"
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extern const char* STARTING_SEARCH;
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extern const char* HOOK_SEARCH_INITIALIZED;
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extern const char* HOOK_SEARCH_FINISHED;
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extern const char* OUT_OF_RECORDS_RETRY;
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extern const char* NOT_ENOUGH_TEXT;
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extern const char* COULD_NOT_FIND;
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extern WinMutex viewMutex;
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namespace
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{
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SearchParam sp;
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constexpr int MAX_STRING_SIZE = 500, CACHE_SIZE = 749993, GOOD_PAGE = -1;
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struct HookRecord
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{
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uint64_t address = 0;
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int offset = 0;
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char text[MAX_STRING_SIZE] = {};
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};
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std::unique_ptr<HookRecord[]> records;
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long recordsAvailable;
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uint64_t signatureCache[CACHE_SIZE] = {};
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long sumCache[CACHE_SIZE] = {};
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uintptr_t pageCache[CACHE_SIZE] = {};
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#ifndef _WIN64
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BYTE trampoline[] =
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{
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0x9c, // pushfd
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0x60, // pushad
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0x68, 0,0,0,0, // push @addr ; after this a total of 0x28 bytes are pushed
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0x8d, 0x44, 0x24, 0x28, // lea eax,[esp+0x28]
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0x50, // push eax ; stack
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0xbb, 0,0,0,0, // mov ebx,@Send
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0xff, 0xd3, // call ebx
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0x83, 0xc4, 0x08, // add esp, 0x8 ; doesn't matter which register
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0x61, // popad
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0x9d, // popfd
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0x68, 0,0,0,0, // push @original
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0xc3 // ret ; basically absolute jmp to @original
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};
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constexpr int addr_offset = 3, send_offset = 13, original_offset = 25, registers = 8;
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#else
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BYTE trampoline[] = {
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0x9c, // push rflags
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0x50, // push rax
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0x53, // push rbx
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0x51, // push rcx
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0x52, // push rdx
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0x54, // push rsp
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0x55, // push rbp
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0x56, // push rsi
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0x57, // push rdi
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0x41, 0x50, // push r8
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0x41, 0x51, // push r9
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0x41, 0x52, // push r10
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0x41, 0x53, // push r11
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0x41, 0x54, // push r12
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0x41, 0x55, // push r13
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0x41, 0x56, // push r14
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0x41, 0x57, // push r15
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// https://docs.microsoft.com/en-us/cpp/build/x64-calling-convention
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// https://stackoverflow.com/questions/43358429/save-value-of-xmm-registers
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0x48, 0x83, 0xec, 0x20, // sub rsp,0x20
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0xc5, 0xfa, 0x7f, 0x24, 0x24, // vmovdqu [rsp],xmm4
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0xc5, 0xfa, 0x7f, 0x6c, 0x24, 0x10, // vmovdqu [rsp+0x10],xmm5
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0x48, 0x8d, 0x8c, 0x24, 0xa8, 0x00, 0x00, 0x00, // lea rcx,[rsp+0xa8]
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0x48, 0xba, 0,0,0,0,0,0,0,0, // mov rcx,@addr
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0x48, 0xb8, 0,0,0,0,0,0,0,0, // mov rax,@Send
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0x48, 0x89, 0xe3, // mov rbx,rsp
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0x48, 0x83, 0xe4, 0xf0, // and rsp,0xfffffffffffffff0 ; align stack
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0xff, 0xd0, // call rax
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0x48, 0x89, 0xdc, // mov rsp,rbx
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0xc5, 0xfa, 0x6f, 0x6c, 0x24, 0x10, // vmovdqu xmm5,XMMWORD PTR[rsp + 0x10]
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0xc5, 0xfa, 0x6f, 0x24, 0x24, // vmovdqu xmm4,XMMWORD PTR[rsp]
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0x48, 0x83, 0xc4, 0x20, // add rsp,0x20
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0x41, 0x5f, // pop r15
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0x41, 0x5e, // pop r14
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0x41, 0x5d, // pop r13
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0x41, 0x5c, // pop r12
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0x41, 0x5b, // pop r11
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0x41, 0x5a, // pop r10
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0x41, 0x59, // pop r9
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0x41, 0x58, // pop r8
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0x5f, // pop rdi
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0x5e, // pop rsi
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0x5d, // pop rbp
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0x5c, // pop rsp
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0x5a, // pop rdx
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0x59, // pop rcx
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0x5b, // pop rbx
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0x58, // pop rax
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0x9d, // pop rflags
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0xff, 0x25, 0x00, 0x00, 0x00, 0x00, // jmp qword ptr [0] ; relative to next instruction (i.e. jmp @original)
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0,0,0,0,0,0,0,0 // @original
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};
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constexpr int addr_offset = 50, send_offset = 60, original_offset = 126, registers = 16;
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#endif
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}
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bool IsBadReadPtr(void* data)
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{
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if (data > records.get() && data < records.get() + sp.maxRecords) return true;
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uintptr_t BAD_PAGE = (uintptr_t)data >> 12;
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auto& cacheEntry = pageCache[BAD_PAGE % CACHE_SIZE];
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if (cacheEntry == BAD_PAGE) return true;
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if (cacheEntry == GOOD_PAGE) return false;
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__try
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{
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volatile char _ = *(char*)data;
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cacheEntry = GOOD_PAGE;
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}
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__except (EXCEPTION_EXECUTE_HANDLER)
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{
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if (GetExceptionCode() == EXCEPTION_GUARD_PAGE)
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{
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MEMORY_BASIC_INFORMATION info;
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VirtualQuery(data, &info, sizeof(info));
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VirtualProtect(data, 1, info.Protect | PAGE_GUARD, DUMMY);
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}
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cacheEntry = BAD_PAGE;
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}
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return cacheEntry == BAD_PAGE;
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}
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void Send(char** stack, uintptr_t address)
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{
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// it is unsafe to call ANY external functions from this, as they may have been hooked (if called the hook would call this function making an infinite loop)
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// the exceptions are compiler intrinsics like _InterlockedDecrement
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if (recordsAvailable <= 0) return;
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for (int i = -registers; i < 10; ++i)
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{
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char* str = stack[i] + sp.padding;
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if (IsBadReadPtr(str) || IsBadReadPtr(str + MAX_STRING_SIZE)) continue;
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__try
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{
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int length = 0, sum = 0;
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for (; (str[length] || str[length + 1]) && length < MAX_STRING_SIZE; length += 2) sum += *(uint16_t*)(str + length);
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if (length > STRING && length < MAX_STRING_SIZE - 1)
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{
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// many duplicate results with same address, offset, and third/fourth character will be found: filter them out
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uint64_t signature = ((uint64_t)i << 56) | ((uint64_t)(str[2] + str[3]) << 48) | address;
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if (signatureCache[signature % CACHE_SIZE] == signature) continue;
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signatureCache[signature % CACHE_SIZE] = signature;
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// if there are huge amount of strings that are the same, it's probably garbage: filter them out
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// can't store all the strings, so use sum as heuristic instead
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if (_InterlockedIncrement(sumCache + (sum % CACHE_SIZE)) > 25) continue;
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long n = _InterlockedDecrement(&recordsAvailable);
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if (n > 0)
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{
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records[n].address = address;
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records[n].offset = i * sizeof(char*);
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for (int j = 0; j < length; ++j) records[n].text[j] = str[j];
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records[n].text[length] = 0;
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}
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if (n == 0)
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{
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spDefault.maxRecords = sp.maxRecords * 2;
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ConsoleOutput(OUT_OF_RECORDS_RETRY);
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}
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}
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}
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__except (EXCEPTION_EXECUTE_HANDLER) {}
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}
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}
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std::vector<uint64_t> GetFunctions(uintptr_t module)
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{
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if (!module) return {};
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IMAGE_DOS_HEADER* dosHeader = (IMAGE_DOS_HEADER*)module;
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if (dosHeader->e_magic != IMAGE_DOS_SIGNATURE) return {};
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IMAGE_NT_HEADERS* ntHeader = (IMAGE_NT_HEADERS*)(module + dosHeader->e_lfanew);
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if (ntHeader->Signature != IMAGE_NT_SIGNATURE) return {};
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DWORD exportAddress = ntHeader->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress;
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if (!exportAddress) return {};
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IMAGE_EXPORT_DIRECTORY* exportDirectory = (IMAGE_EXPORT_DIRECTORY*)(module + exportAddress);
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std::vector<uint64_t> functions;
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for (int i = 0; i < exportDirectory->NumberOfNames; ++i)
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//char* funcName = (char*)(module + *(DWORD*)(module + exportDirectory->AddressOfNames + i * sizeof(DWORD)));
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functions.push_back(module + *(DWORD*)(module + exportDirectory->AddressOfFunctions +
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sizeof(DWORD) * *(WORD*)(module + exportDirectory->AddressOfNameOrdinals + i * sizeof(WORD))));
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return functions;
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}
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void SearchForHooks(SearchParam spUser)
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{
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std::thread([=]
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{
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static std::mutex m;
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std::scoped_lock lock(m);
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sp = spUser.length == 0 ? spDefault : spUser;
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do
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try { records = std::make_unique<HookRecord[]>(recordsAvailable = sp.maxRecords); }
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catch (std::bad_alloc) { ConsoleOutput("Textractor: SearchForHooks ERROR: out of memory, retrying to allocate %d", sp.maxRecords /= 2); }
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while (!records && sp.maxRecords);
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uintptr_t moduleStartAddress = (uintptr_t)GetModuleHandleW(ITH_DLL);
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uintptr_t moduleStopAddress = moduleStartAddress;
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MEMORY_BASIC_INFORMATION info;
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do
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{
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VirtualQuery((void*)moduleStopAddress, &info, sizeof(info));
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moduleStopAddress = (uintptr_t)info.BaseAddress + info.RegionSize;
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} while (info.Protect >= PAGE_EXECUTE);
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moduleStopAddress -= info.RegionSize;
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ConsoleOutput(STARTING_SEARCH);
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std::vector<uint64_t> addresses;
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if (*sp.module) addresses = GetFunctions((uintptr_t)GetModuleHandleW(sp.module));
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else for (auto& addr : addresses = Util::SearchMemory(sp.pattern, sp.length, PAGE_EXECUTE, sp.minAddress, sp.maxAddress)) addr += sp.offset;
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addresses.erase(std::remove_if(addresses.begin(), addresses.end(), [&](uint64_t addr) { return addr > moduleStartAddress && addr < moduleStopAddress; }), addresses.end());
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*(void**)(trampoline + send_offset) = Send;
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auto trampolines = (decltype(trampoline)*)VirtualAlloc(NULL, sizeof(trampoline) * addresses.size(), MEM_COMMIT, PAGE_READWRITE);
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VirtualProtect(trampolines, addresses.size() * sizeof(trampoline), PAGE_EXECUTE_READWRITE, DUMMY);
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for (int i = 0; i < addresses.size(); ++i)
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{
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void* original;
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MH_CreateHook((void*)addresses[i], trampolines[i], &original);
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MH_QueueEnableHook((void*)addresses[i]);
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memcpy(trampolines[i], trampoline, sizeof(trampoline));
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*(uintptr_t*)(trampolines[i] + addr_offset) = addresses[i];
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*(void**)(trampolines[i] + original_offset) = original;
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}
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ConsoleOutput(HOOK_SEARCH_INITIALIZED, addresses.size());
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MH_ApplyQueued();
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Sleep(sp.searchTime);
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for (auto addr : addresses) MH_QueueDisableHook((void*)addr);
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MH_ApplyQueued();
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Sleep(1000);
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for (auto addr : addresses) MH_RemoveHook((void*)addr);
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ConsoleOutput(HOOK_SEARCH_FINISHED, sp.maxRecords - recordsAvailable);
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for (int i = 0, j = 0; i < sp.maxRecords; ++i)
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{
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if (!records[i].address) continue;
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if (++j % 100'000 == 0) ConsoleOutput("Textractor: %d results processed", j);
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HookParam hp = {};
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hp.offset = records[i].offset;
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hp.type = USING_UNICODE | USING_STRING;
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hp.address = records[i].address;
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hp.padding = sp.padding;
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hp.codepage = sp.codepage;
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if (sp.hookPostProcessor) sp.hookPostProcessor(hp);
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NotifyHookFound(hp, (wchar_t*)records[i].text);
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}
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records.reset();
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VirtualFree(trampolines, 0, MEM_RELEASE);
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for (int i = 0; i < CACHE_SIZE; ++i) signatureCache[i] = sumCache[i] = pageCache[i] = 0;
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}).detach();
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}
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void SearchForText(wchar_t* text, UINT codepage)
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{
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bool found = false;
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char utf8Text[PATTERN_SIZE * 4] = {};
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WideCharToMultiByte(CP_UTF8, 0, text, PATTERN_SIZE, utf8Text, PATTERN_SIZE * 4, nullptr, nullptr);
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char codepageText[PATTERN_SIZE * 4] = {};
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WideCharToMultiByte(codepage, 0, text, PATTERN_SIZE, codepageText, PATTERN_SIZE * 4, nullptr, nullptr);
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if (strlen(utf8Text) < 4 || strlen(codepageText) < 4 || wcslen(text) < 4) return ConsoleOutput(NOT_ENOUGH_TEXT);
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ConsoleOutput(STARTING_SEARCH);
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auto GenerateHooks = [&](std::vector<uint64_t> addresses, HookParamType type)
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{
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for (auto addr : addresses)
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{
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if (abs((long long)(utf8Text - addr)) < 20000) continue; // don't add read code if text is on this thread's stack
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found = true;
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HookParam hp = {};
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hp.type = DIRECT_READ | type;
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hp.address = addr;
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hp.codepage = codepage;
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NewHook(hp, "Search", 0);
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}
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};
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GenerateHooks(Util::SearchMemory(utf8Text, strlen(utf8Text), PAGE_READWRITE), USING_UTF8);
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GenerateHooks(Util::SearchMemory(codepageText, strlen(codepageText), PAGE_READWRITE), USING_STRING);
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GenerateHooks(Util::SearchMemory(text, wcslen(text) * sizeof(wchar_t), PAGE_READWRITE), USING_UNICODE);
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if (!found) ConsoleOutput(COULD_NOT_FIND);
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}
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