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finally, hooks work in x64!

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This commit is contained in:
Akash Mozumdar 2018-12-20 11:46:11 -05:00
parent 7ec7253ec3
commit 7cd464661b
2 changed files with 129 additions and 105 deletions
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130
vnrhook/texthook.cc
View File

@ -14,6 +14,7 @@
#include "engine/match.h"
#include "main.h"
#include "const.h"
#include "defs.h"
#include "text.h"
#include "ithsys/ithsys.h"
#include "growl.h"
@ -43,7 +44,7 @@ namespace { // unnamed
};
#else
const BYTE common_hook[] = {
BYTE common_hook[] = {
0x9c, // push rflags
0x50, // push rax
0x53, // push rbx
@ -61,9 +62,18 @@ namespace { // unnamed
0x41, 0x55, // push r13
0x41, 0x56, // push r14
0x41, 0x57, // push r15
0x48, 0x8b, 0xd4, // mov rdx,rsp
0x48, 0xb9, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, // mov rcx, ?? ; pointer to TextHook
0xff, 0x15, 0x02, 0x0, 0x0, 0x0, 0xeb, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, // call TextHook::Send
// https://docs.microsoft.com/en-us/cpp/build/x64-calling-convention
// https://stackoverflow.com/questions/43358429/save-value-of-xmm-registers
0x48, 0x83, 0xec, 0x20, // sub rsp,0x20
0xc5, 0xfa, 0x7f, 0x24, 0x24, // vmovdqu [rsp],xmm4
0xc5, 0xfa, 0x7f, 0x6c, 0x24, 0x10, // vmovdqu [rsp+0x10],xmm5
0x48, 0x8d, 0x94, 0x24, 0xa8, 0x00, 0x00, 0x00, // lea rdx,[rsp+0xa8]
0x48, 0xb9, 0,0,0,0,0,0,0,0, // mov rcx,@this
0x48, 0xb8, 0,0,0,0,0,0,0,0, // mov rax,@TextHook::Send
0xff, 0xd0, // call rax
0xc5, 0xfa, 0x6f, 0x6c, 0x24, 0x10, // vmovdqu xmm5,XMMWORD PTR[rsp + 0x10]
0xc5, 0xfa, 0x6f, 0x24, 0x24, // vmovdqu xmm4,XMMWORD PTR[rsp]
0x48, 0x83, 0xc4, 0x20, // add rsp,0x20
0x41, 0x5f, // pop r15
0x41, 0x5e, // pop r14
0x41, 0x5d, // pop r13
@ -81,7 +91,8 @@ namespace { // unnamed
0x5b, // pop rbx
0x58, // pop rax
0x9d, // pop rflags
0xff, 0x25, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 // jmp @original
0xff, 0x25, 0x00, 0x00, 0x00, 0x00, // jmp qword ptr [0] ; relative to next instruction (i.e. jmp @original)
0,0,0,0,0,0,0,0 // @original
};
#endif
@ -103,62 +114,46 @@ bool TextHook::Insert(HookParam h, DWORD set_flag)
hp.type |= set_flag;
if (hp.type & USING_UTF8) hp.codepage = CP_UTF8;
if (hp.type & DIRECT_READ) return InsertReadCode();
#ifndef _WIN64
else return InsertHookCode();
#endif
return false;
}
#ifndef _WIN64
// jichi 5/11/2014:
// - dwDataBase: the stack address
void TextHook::Send(DWORD dwDataBase)
#ifndef _WIN64
void TextHook::Send(uintptr_t dwDataBase)
{
__try
{
DWORD dwCount,
dwAddr,
dwDataIn,
dwRetn,
dwSplit;
BYTE pbData[PIPE_BUFFER_SIZE];
DWORD dwType = hp.type;
dwAddr = address;
DWORD dwCount = 0,
dwSplit = 0,
dwDataIn = *(DWORD*)(dwDataBase + hp.offset), // default values
dwRetn = *(DWORD*)dwDataBase; // first value on stack (if hooked start of function, this is return address)
if (trigger)
trigger = Engine::InsertDynamicHook((LPVOID)dwAddr, *(DWORD *)(dwDataBase - 0x1c), *(DWORD *)(dwDataBase - 0x18));
if (trigger) trigger = Engine::InsertDynamicHook(location, *(DWORD *)(dwDataBase - 0x1c), *(DWORD *)(dwDataBase - 0x18));
// jichi 10/24/2014: generic hook function
if (hp.hook_fun && !hp.hook_fun(dwDataBase, &hp))
hp.hook_fun = nullptr;
if (hp.hook_fun && !hp.hook_fun(dwDataBase, &hp)) hp.hook_fun = nullptr;
if (dwType & HOOK_EMPTY) return; // jichi 10/24/2014: dummy hook only for dynamic hook
dwCount = 0;
dwSplit = 0;
dwDataIn = *(DWORD *)(dwDataBase + hp.offset); // default value
if (hp.type & HOOK_EMPTY) return; // jichi 10/24/2014: dummy hook only for dynamic hook
if (hp.text_fun) {
hp.text_fun(dwDataBase, &hp, 0, &dwDataIn, &dwSplit, &dwCount);
}
else {
if (dwDataIn == 0) return;
if (dwType & FIXING_SPLIT) dwSplit = FIXED_SPLIT_VALUE; // fuse all threads, and prevent floating
else if (dwType & USING_SPLIT) {
if (hp.type & FIXING_SPLIT) dwSplit = FIXED_SPLIT_VALUE; // fuse all threads, and prevent floating
else if (hp.type & USING_SPLIT) {
dwSplit = *(DWORD *)(dwDataBase + hp.split);
if (dwType & SPLIT_INDIRECT) dwSplit = *(DWORD *)(dwSplit + hp.split_index);
if (hp.type & SPLIT_INDIRECT) dwSplit = *(DWORD *)(dwSplit + hp.split_index);
}
if (dwType & DATA_INDIRECT) dwDataIn = *(DWORD *)(dwDataIn + hp.index);
if (hp.type & DATA_INDIRECT) dwDataIn = *(DWORD *)(dwDataIn + hp.index);
dwCount = GetLength(dwDataBase, dwDataIn);
}
if (dwCount == 0 || dwCount > PIPE_BUFFER_SIZE - sizeof(ThreadParam)) return;
BYTE pbData[PIPE_BUFFER_SIZE];
if (hp.length_offset == 1) {
dwDataIn &= 0xffff;
if ((dwType & BIG_ENDIAN) && (dwDataIn >> 8)) dwDataIn = _byteswap_ushort(dwDataIn & 0xffff);
if ((hp.type & BIG_ENDIAN) && (dwDataIn >> 8)) dwDataIn = _byteswap_ushort(dwDataIn & 0xffff);
if (dwCount == 1) dwDataIn &= 0xff;
*(WORD*)pbData = dwDataIn & 0xffff;
}
@ -166,15 +161,53 @@ void TextHook::Send(DWORD dwDataBase)
if (hp.filter_fun && !hp.filter_fun(pbData, &dwCount, &hp, 0) || dwCount <= 0) return;
if (dwType & (NO_CONTEXT | FIXING_SPLIT)) dwRetn = 0;
if (hp.type & (NO_CONTEXT | FIXING_SPLIT)) dwRetn = 0;
TextOutput({ GetCurrentProcessId(), dwAddr, dwRetn, dwSplit }, pbData, dwCount);
TextOutput({ GetCurrentProcessId(), address, dwRetn, dwSplit }, pbData, dwCount);
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
ConsoleOutput("Textractor: Send ERROR (likely an incorrect H-code)");
}
}
#else // _WIN32
void TextHook::Send(uintptr_t dwDataBase)
{
__try
{
int count = 0;
ThreadParam tp = { GetCurrentProcessId(), address, *(uintptr_t*)dwDataBase, 0 }; // first value on stack (if hooked start of function, this is return address)
uintptr_t data = *(uintptr_t*)(dwDataBase + hp.offset); // default value
if (hp.type & USING_SPLIT)
{
tp.ctx2 = *(uintptr_t*)(dwDataBase + hp.split);
if (hp.type & SPLIT_INDIRECT) tp.ctx2 = *(uintptr_t*)(tp.ctx2 + hp.split_index);
}
if (hp.type & DATA_INDIRECT) data = *(uintptr_t*)(data + hp.index);
count = GetLength(dwDataBase, data);
if (count == 0) return;
BYTE pbData[PIPE_BUFFER_SIZE];
if (hp.length_offset == 1)
{
data &= 0xffff;
if ((hp.type & BIG_ENDIAN) && (data >> 8)) data = _byteswap_ushort(data & 0xffff);
if (count == 1) data &= 0xff;
*(WORD*)pbData = data & 0xffff;
}
else ::memcpy(pbData, (void*)data, count);
if (hp.type & (NO_CONTEXT | FIXING_SPLIT)) tp.ctx = 0;
TextOutput(tp, pbData, count);
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
ConsoleOutput("Textractor: Send ERROR (likely an incorrect H-code)");
}
}
#endif // _WIN64
bool TextHook::InsertHookCode()
{
@ -203,23 +236,16 @@ insert:
#ifndef _WIN64
*(TextHook**)(common_hook + 9) = this;
*(void(TextHook::**)(DWORD))(common_hook + 14) = &TextHook::Send;
*(void(TextHook::**)(uintptr_t))(common_hook + 14) = &TextHook::Send;
*(void**)(common_hook + 24) = original;
memcpy(trampoline, common_hook, sizeof(common_hook));
#else // _WIN32
BYTE* original;
MH_CreateHook((void*)hp.address, (void*)trampoline, (void**)&original);
memcpy(trampoline, common_hook, sizeof(common_hook));
void* thisPtr = (void*)this;
memcpy(trampoline + 30, &thisPtr, sizeof(void*));
auto sendPtr = (void(TextHook::*)(void*))&TextHook::Send;
memcpy(trampoline + 46, &sendPtr, sizeof(sendPtr));
memcpy(trampoline + sizeof(common_hook) - 8, &original, sizeof(void*));
*(TextHook**)(common_hook + 50) = this;
*(void(TextHook::**)(uintptr_t))(common_hook + 60) = &TextHook::Send;
*(void**)(common_hook + 116) = original;
#endif // _WIN64
memcpy(trampoline, common_hook, sizeof(common_hook));
return MH_EnableHook(location) == MH_OK;
}
#endif // _WIN32
DWORD WINAPI TextHook::Reader(LPVOID hookPtr)
{
@ -290,14 +316,12 @@ void TextHook::Clear()
memset(this, 0, sizeof(TextHook)); // jichi 11/30/2013: This is the original code of ITH
}
int TextHook::GetLength(DWORD base, DWORD in)
int TextHook::GetLength(uintptr_t base, uintptr_t in)
{
if (base == 0)
return 0;
int len;
switch (hp.length_offset) {
default: // jichi 12/26/2013: I should not put this default branch to the end
len = *((int *)base + hp.length_offset);
len = *((uintptr_t*)base + hp.length_offset);
if (len >= 0) {
if (hp.type & USING_UNICODE)
len <<= 1;

6
vnrhook/texthook.h
View File

@ -32,13 +32,13 @@ private:
static DWORD WINAPI Reader(LPVOID hookPtr);
bool InsertHookCode();
bool InsertReadCode();
void Send(DWORD dwDatabase);
int GetLength(DWORD base, DWORD in); // jichi 12/25/2013: Return 0 if failed
void Send(uintptr_t dwDatabase);
int GetLength(uintptr_t base, uintptr_t in); // jichi 12/25/2013: Return 0 if failed
void RemoveHookCode();
void RemoveReadCode();
HANDLE readerThread, readerEvent;
BYTE trampoline[120];
BYTE trampoline[130];
};