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Copy pathFunctionCalls.cpp
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416 lines (342 loc) · 13.4 KB
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#include "FunctionCalls.h"
// Static members
const int FunctionCalls::PARAMETER_TYPE_INT = 0;
const int FunctionCalls::PARAMETER_TYPE_STRING = 1;
size_t FunctionCalls::AllFunctionCallsNr;
vector<FunctionCalls::FunctionCall> FunctionCalls::AllFunctionCalls;
bool FunctionCalls::FirstFunctionCall = true;
// Add function call name
void FunctionCalls::AddFunctionCallName(string p_sFunctionName)
{
FunctionCall Function;
Function.Name = p_sFunctionName;
AllFunctionCalls.push_back(Function);
if (FirstFunctionCall) FirstFunctionCall = false;
else AllFunctionCallsNr++;
}
// Add function call int parameter
void FunctionCalls::AddFunctionCallIntParameter(string p_sIntParameter)
{
Parameter Param;
Param.Type = PARAMETER_TYPE_INT;
Param.IntValue = (size_t)stoll(p_sIntParameter);
AllFunctionCalls[AllFunctionCallsNr].Parameters.push_back(Param);
}
// Add function call string parameter
void FunctionCalls::AddFunctionCallStringParameter(string p_sStringParameter)
{
Parameter Param;
Param.Type = PARAMETER_TYPE_STRING;
Param.StringValue = p_sStringParameter;
AllFunctionCalls[AllFunctionCallsNr].Parameters.push_back(Param);
}
// Check if a function exists
bool FunctionCalls::FunctionExists(string p_sFunctionName)
{
for (size_t i = 0; i < DeclaredFunctions::AllDeclaredFunctions.size(); i++)
if (DeclaredFunctions::AllDeclaredFunctions[i].Name.compare(p_sFunctionName) == 0) return true;
return false;
}
// Put a string (function parameter) on the stack for x86
string FunctionCalls::GeneratePutStringToStack_x86(string p_sString)
{
string sContent = "";
size_t Len = p_sString.length();
// Check if the string was already on the stack
if (StringOffsetAddress::StringOffsetExists(p_sString)) return "";
if (Len % 4 == 0)
{
sContent = "xor eax, eax ; EAX = 0 \r\n";
sContent += "push eax ; NULL on the stack \r\n";
}
else if (Len % 4 == 1)
{
sContent = "xor eax, eax\r\n";
sContent += "mov al, 0x";
sContent += Utils::CharToHexString(p_sString[Len - 1]);
sContent += "\r\n";
sContent += "push eax\r\n";
}
else if (Len % 4 == 2)
{
sContent = "xor eax, eax\r\n";
sContent += "mov ax, 0x";
sContent += Utils::CharToHexString(p_sString[Len - 1]);
sContent += Utils::CharToHexString(p_sString[Len - 2]);
sContent += "\r\n";
sContent += "push eax\r\n";
}
else if (Len % 4 == 3)
{
sContent = "xor eax, eax\r\n";
sContent += "mov eax, 0x23";
sContent += Utils::CharToHexString(p_sString[Len - 1]);
sContent += Utils::CharToHexString(p_sString[Len - 2]);
sContent += Utils::CharToHexString(p_sString[Len - 3]);
sContent += "\r\n";
sContent += "push eax\r\n";
sContent += "sub dword ptr [esp + 3], 0x23\r\n";
}
else cout << "Imaginary number?" << endl;
// Put the string as hex data pushes on the stack
size_t Times = Len / 4;
for (size_t i = Times; i > 0; i--)
{
sContent += "push 0x";
for (size_t j = 4; j > 0; j--)
{
sContent += Utils::CharToHexString(p_sString[i * 4 - 4 + j - 1]);
}
sContent += "\r\n";
}
// Add string offset
sContent += "push esp\r\n\r\n";
StringOffsetAddress::CurrentStringOffset = StringOffsetAddress::CurrentStringOffset + Times + 2;
StringOffsetAddress::AddStringOffset(p_sString);
return sContent;
}
// Put a string (function parameter) on the stack for x64
string FunctionCalls::GeneratePutStringToStack_x64(string p_sString)
{
string sContent = "";
size_t Len = p_sString.length();
// Check if the string was already on the stack
if (StringOffsetAddress::StringOffsetExists(p_sString)) return "";
if (Len % 8 == 0)
{
sContent = "xor rax, rax ; EAX = 0 \r\n";
sContent += "push rax ; NULL on the stack \r\n";
}
else if (Len % 8 == 1)
{
sContent = "xor rax, rax\r\n";
sContent += "mov al, 0x";
sContent += Utils::CharToHexString(p_sString[Len - 1]);
sContent += "\r\n";
sContent += "push rax\r\n";
}
else if (Len % 8 == 2)
{
sContent = "xor rax, rax\r\n";
sContent += "mov ax, 0x";
sContent += Utils::CharToHexString(p_sString[Len - 1]);
sContent += Utils::CharToHexString(p_sString[Len - 2]);
sContent += "\r\n";
sContent += "push rax\r\n";
}
else if (Len % 8 == 3)
{
sContent = "xor rax, rax\r\n";
sContent += "mov eax, 0x";
sContent += Utils::CharToHexString(p_sString[Len - 1]);
sContent += Utils::CharToHexString(p_sString[Len - 2]);
sContent += Utils::CharToHexString(p_sString[Len - 3]);
sContent += "\r\n";
sContent += "push rax\r\n";
}
else if (Len % 8 == 4)
{
sContent = "xor rax, rax\r\n";
sContent += "mov eax, 0x";
sContent += Utils::CharToHexString(p_sString[Len - 1]);
sContent += Utils::CharToHexString(p_sString[Len - 2]);
sContent += Utils::CharToHexString(p_sString[Len - 3]);
sContent += Utils::CharToHexString(p_sString[Len - 4]);
sContent += "\r\n";
sContent += "push rax\r\n";
}
else if (Len % 8 == 5)
{
sContent = "xor rax, rax\r\n";
sContent += "mov rax, 0x";
sContent += Utils::CharToHexString(p_sString[Len - 1]);
sContent += Utils::CharToHexString(p_sString[Len - 2]);
sContent += Utils::CharToHexString(p_sString[Len - 3]);
sContent += Utils::CharToHexString(p_sString[Len - 4]);
sContent += Utils::CharToHexString(p_sString[Len - 5]);
sContent += "\r\n";
sContent += "push rax\r\n";
}
else if (Len % 8 == 6)
{
sContent = "xor rax, rax\r\n";
sContent += "mov rax, 0x";
sContent += Utils::CharToHexString(p_sString[Len - 1]);
sContent += Utils::CharToHexString(p_sString[Len - 2]);
sContent += Utils::CharToHexString(p_sString[Len - 3]);
sContent += Utils::CharToHexString(p_sString[Len - 4]);
sContent += Utils::CharToHexString(p_sString[Len - 5]);
sContent += Utils::CharToHexString(p_sString[Len - 6]);
sContent += "\r\n";
sContent += "push rax\r\n";
}
else if (Len % 8 == 7)
{
sContent = "xor rax, rax\r\n";
sContent += "mov rax, 0x";
sContent += Utils::CharToHexString(p_sString[Len - 1]);
sContent += Utils::CharToHexString(p_sString[Len - 2]);
sContent += Utils::CharToHexString(p_sString[Len - 3]);
sContent += Utils::CharToHexString(p_sString[Len - 4]);
sContent += Utils::CharToHexString(p_sString[Len - 5]);
sContent += Utils::CharToHexString(p_sString[Len - 6]);
sContent += Utils::CharToHexString(p_sString[Len - 7]);
sContent += "\r\n";
sContent += "push rax\r\n";
}
else cout << "Imaginary number?" << endl;
// Put the string as hex data pushes on the stack
size_t Times = Len / 8;
for (size_t i = Times; i > 0; i--)
{
sContent += "mov rax, 0x";
for (size_t j = 8; j > 0; j--)
{
sContent += Utils::CharToHexString(p_sString[i * 8 - 8 + j - 1]);
}
sContent += "\r\n";
sContent += "push rax\r\n";
}
// Add string offset
sContent += "push rsp\r\n\r\n";
StringOffsetAddress::CurrentStringOffset = StringOffsetAddress::CurrentStringOffset + Times + 2;
StringOffsetAddress::AddStringOffset(p_sString);
return sContent;
}
// Generate a function call
string FunctionCalls::GenerateFunctionCall(FunctionCalls::FunctionCall p_oFunctionCall)
{
if (Platform::GetPlatform() == PLATFORM_TYPE_WINDOWS_X64) return GenerateFunctionCall_x64(p_oFunctionCall);
else return GenerateFunctionCall_x86(p_oFunctionCall);
}
// Generate a function call for x86
string FunctionCalls::GenerateFunctionCall_x86(FunctionCalls::FunctionCall p_oFunctionCall)
{
string sContent = "";
size_t NrParam = p_oFunctionCall.Parameters.size();
size_t CurrentParamNr = 1;
// First, put all string parameters on the stack
for (size_t i = 0; i < p_oFunctionCall.Parameters.size(); i++)
if (p_oFunctionCall.Parameters[i].Type == FunctionCalls::PARAMETER_TYPE_STRING) sContent += GeneratePutStringToStack_x86(p_oFunctionCall.Parameters[i].StringValue);
// Parse all arguments (from the end)
for (size_t i = NrParam - 1; ; i--)
{
if (p_oFunctionCall.Parameters[i].Type == FunctionCalls::PARAMETER_TYPE_STRING)
{
sContent += "push dword ptr [ESP + ";
sContent += to_string(((CurrentParamNr - 1) * 4) + ((StringOffsetAddress::CurrentStringOffset - StringOffsetAddress::GetStringOffset(p_oFunctionCall.Parameters[i].StringValue)) * 4));
sContent += "]\r\n";
}
else if (p_oFunctionCall.Parameters[i].Type == FunctionCalls::PARAMETER_TYPE_INT)
{
// If int parameter is 0, avoid NULL
if (p_oFunctionCall.Parameters[i].IntValue == 0)
{
sContent += "xor eax, eax\r\n";
sContent += "push eax\r\n";
}
else
{
sContent += "push 0x";
sContent += Utils::IntToHexString(p_oFunctionCall.Parameters[i].IntValue);
sContent += "\r\n";
}
}
else cout << "Error: Undefined parameter type!" << endl;
CurrentParamNr++;
if (i == 0) break;
}
// Call function
sContent += "call [ESP + ";
sContent += to_string(((NrParam - 1) * 4) + (StringOffsetAddress::CurrentStringOffset * 4) + ((FunctionOffsetAddress::CurrentFunctionOffset - FunctionOffsetAddress::GetFunctionOffset(p_oFunctionCall.Name)) * 4));
sContent += "]\r\n";
// Clean string parameters
if (StringOffsetAddress::CurrentStringOffset > 0)
{
sContent += "add ESP, ";
sContent += to_string(StringOffsetAddress::CurrentStringOffset * 4);
sContent += "\r\n";
}
// Clean global strings data
StringOffsetAddress::CurrentStringOffset = 0;
StringOffsetAddress::StringOffsets.clear();
return sContent;
}
// Generate a function call for x64
string FunctionCalls::GenerateFunctionCall_x64(FunctionCalls::FunctionCall p_oFunctionCall)
{
string sContent = "";
size_t NrParam = p_oFunctionCall.Parameters.size();
size_t CurrentParamNr = 1;
size_t ParamsInRegisters = (NrParam >= 4) ? 4 : NrParam;
size_t AdjustStack = 0;
// First, put all string parameters on the stack
for (size_t i = 0; i < p_oFunctionCall.Parameters.size(); i++)
if (p_oFunctionCall.Parameters[i].Type == FunctionCalls::PARAMETER_TYPE_STRING) sContent += GeneratePutStringToStack_x64(p_oFunctionCall.Parameters[i].StringValue);
// Align stack after strings are placed on the stack
AdjustStack = (StringOffsetAddress::CurrentStringOffset + (NrParam - ParamsInRegisters) + DeclaredFunctions::NrFunctionsToStack + DeclaredFunctions::NrBasesToStack ) % 2;
if (AdjustStack) sContent += "push r12 \r\n";
// Parse all arguments (from the end)
for (size_t i = NrParam - 1; ; i--)
{
// We treat separatelty first 4 registers
if (p_oFunctionCall.Parameters[i].Type == FunctionCalls::PARAMETER_TYPE_STRING)
{
size_t CurrentParamNotInRegisters = (CurrentParamNr > 4) ? (CurrentParamNr - 4) : ( (NrParam <= 4) ? 0 : (NrParam - 4));
string str_offset = to_string(((CurrentParamNotInRegisters) * 8) + ((StringOffsetAddress::CurrentStringOffset + AdjustStack - StringOffsetAddress::GetStringOffset(p_oFunctionCall.Parameters[i].StringValue)) * 8));
if(i == 0) sContent += "mov rcx, [RSP + " + str_offset + "] \r\n";
else if(i == 1) sContent += "mov rdx, [RSP + " + str_offset + "] \r\n";
else if(i == 2) sContent += "mov r8, [RSP + " + str_offset + "] \r\n";
else if(i == 3) sContent += "mov r9, [RSP + " + str_offset + "] \r\n";
else sContent += "push [RSP + " + str_offset + "]\r\n";
}
else if (p_oFunctionCall.Parameters[i].Type == FunctionCalls::PARAMETER_TYPE_INT)
{
// If int parameter is 0, avoid NULL
if (p_oFunctionCall.Parameters[i].IntValue == 0)
{
if (i == 0) sContent += "xor rcx, rcx \r\n";
else if (i == 1) sContent += "xor rdx, rdx \r\n";
else if (i == 2) sContent += "xor r8, r8 \r\n";
else if (i == 3) sContent += "xor r9, r9 \r\n";
else sContent += "xor rax, rax \r\npush rax \r\n";
}
else
{
if (i == 0) sContent += "mov rcx, 0x" + Utils::IntToHexString(p_oFunctionCall.Parameters[i].IntValue) + "\r\n";
else if (i == 1) sContent += "mov rdx, 0x" + Utils::IntToHexString(p_oFunctionCall.Parameters[i].IntValue) + "\r\n";
else if (i == 2) sContent += "mov r8, 0x" + Utils::IntToHexString(p_oFunctionCall.Parameters[i].IntValue) + "\r\n";
else if (i == 3) sContent += "mov r9, 0x" + Utils::IntToHexString(p_oFunctionCall.Parameters[i].IntValue) + "\r\n";
else sContent += "push 0x" + Utils::IntToHexString(p_oFunctionCall.Parameters[i].IntValue) + "\r\n";
}
}
else cout << "Error: Undefined parameter type!" << endl;
CurrentParamNr++;
if (i == 0) break;
}
// Allocate stack and correct function call (and cleanup)
sContent += "sub rsp, 0x20 ; Stack space \r\n";
// Call function
size_t FunctOffset = ((NrParam - ParamsInRegisters - 1) * 8); // Nr of parameters pushed on the stack
FunctOffset += (StringOffsetAddress::CurrentStringOffset * 8); // Strings pushed on the stack
FunctOffset += ((FunctionOffsetAddress::CurrentFunctionOffset - FunctionOffsetAddress::GetFunctionOffset(p_oFunctionCall.Name)) * 8); // Function table offset
if (AdjustStack) FunctOffset += 0x8;
FunctOffset += 0x20;
sContent += "call [RSP + ";
sContent += to_string(FunctOffset);
sContent += "]\r\n";
// Cleanup stack
if (AdjustStack) sContent += "add rsp, 0x28\r\n";
else sContent += "add rsp, 0x20\r\n";
// Clean string parameters
if (StringOffsetAddress::CurrentStringOffset > 0)
{
sContent += "add RSP, ";
sContent += to_string((NrParam - ParamsInRegisters) * 8 + StringOffsetAddress::CurrentStringOffset * 8);
sContent += "\r\n";
}
// Clean global strings data
StringOffsetAddress::CurrentStringOffset = 0;
StringOffsetAddress::StringOffsets.clear();
return sContent;
}