Rim/iw4x-client
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Create Security module for sec related patches

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This commit is contained in:
Diavolo 2022-04-19 15:26:29 +02:00
parent bd19102eb7
commit 0b57d35aac
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GPG Key ID: FA77F074E98D98A5
12 changed files with 208 additions and 161 deletions
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1
src/Components/Loader.cpp
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@ -84,6 +84,7 @@ namespace Components
Loader::Register(new ModelSurfs());
Loader::Register(new PlayerName());
Loader::Register(new QuickPatch());
Loader::Register(new Security());
Loader::Register(new ServerInfo());
Loader::Register(new ServerList());
Loader::Register(new SlowMotion());

1
src/Components/Loader.hpp
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@ -85,6 +85,7 @@ namespace Components
#include "Modules/Network.hpp"
#include "Modules/Theatre.hpp"
#include "Modules/QuickPatch.hpp"
#include "Modules/Security.hpp"
#include "Modules/Node.hpp"
#include "Modules/RCon.hpp"
#include "Modules/Party.hpp" // Destroys the order, but requires network classes :D

59
src/Components/Modules/PlayerName.cpp
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@ -8,7 +8,7 @@ namespace Components
{
if (!sv_allowColoredNames.get<bool>())
{
char nameBuffer[64] = { 0 };
char nameBuffer[64] = {0};
TextRenderer::StripColors(name, nameBuffer, sizeof(nameBuffer));
TextRenderer::StripAllTextIcons(nameBuffer, buffer, size);
}
@ -26,12 +26,12 @@ namespace Components
}
}
__declspec(naked) void PlayerName::ClientUserinfoChanged()
__declspec(naked) void PlayerName::ClientCleanName()
{
__asm
{
mov eax, [esp + 4h] // length
//sub eax, 1
push eax
push ecx // name
@ -53,12 +53,57 @@ namespace Components
return buf;
}
char* PlayerName::CleanStrStub(char* string)
{
TextRenderer::StripColors(string, string, strlen(string) + 1);
return string;
}
bool PlayerName::CopyClientNameCheck(char* dest, const char* source, int size)
{
Utils::Hook::Call<void(char*, const char*, int)>(0x4D6F80)(dest, source, size); // I_strncpyz
auto i = 0;
while (i < size - 1 && dest[i] != '\0')
{
if (dest[i] > 125 || dest[i] < 32 || dest[i] == '%')
{
return false; // Illegal string
}
++i;
}
return true;
}
__declspec(naked) void PlayerName::SV_UserinfoChangedStub()
{
__asm
{
call CopyClientNameCheck
test al, al
jnz returnSafe
pushad
push 1 // tellThem
push INVALID_NAME_MSG // reason
push edi // drop
mov eax, 0x4D1600 // SV_DropClient
call eax
add esp, 0xC
popad
returnSafe:
push 0x401988
retn
}
}
PlayerName::PlayerName()
{
sv_allowColoredNames = Dvar::Register<bool>("sv_allowColoredNames", true, Game::dvar_flag::DVAR_NONE, "Allow colored names on the server");
@ -66,13 +111,17 @@ namespace Components
// Disable SV_UpdateUserinfo_f, to block changing the name ingame
Utils::Hook::Set<BYTE>(0x6258D0, 0xC3);
// Allow colored names ingame
Utils::Hook(0x5D8B40, ClientUserinfoChanged, HOOK_JUMP).install()->quick();
// Allow colored names ingame. Hook placed in ClientUserinfoChanged
Utils::Hook(0x5D8B40, ClientCleanName, HOOK_JUMP).install()->quick();
// Though, don't apply that to overhead names.
Utils::Hook(0x581932, GetClientName, HOOK_CALL).install()->quick();
// Patch I_CleanStr
Utils::Hook(0x4AD470, CleanStrStub, HOOK_JUMP).install()->quick();
// Detect invalid characters including '%' to prevent format string vulnerabilities.
// Kicks the player as soon as possible
Utils::Hook(0x401983, SV_UserinfoChangedStub, HOOK_JUMP).install()->quick();
}
}

7
src/Components/Modules/PlayerName.hpp
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@ -11,9 +11,14 @@ namespace Components
private:
static Dvar::Var sv_allowColoredNames;
// Message used when kicking players
static constexpr auto INVALID_NAME_MSG = "Invalid name detected";
static char* CleanStrStub(char* string);
static void ClientUserinfoChanged();
static void ClientCleanName();
static char* GetClientName(int localClientNum, int index, char* buf, size_t size);
static bool CopyClientNameCheck(char* dest, const char* source, int size);
static void SV_UserinfoChangedStub();
};
}

137
src/Components/Modules/QuickPatch.cpp
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@ -47,62 +47,6 @@ namespace Components
}
}
int QuickPatch::MsgReadBitsCompressCheckSV(const char *from, char *to, int size)
{
static char buffer[0x8000];
if (size > 0x800) return 0;
size = Game::MSG_ReadBitsCompress(from, buffer, size);
if (size > 0x800) return 0;
std::memcpy(to, buffer, size);
return size;
}
int QuickPatch::MsgReadBitsCompressCheckCL(const char *from, char *to, int size)
{
static char buffer[0x100000];
if (size > 0x20000) return 0;
size = Game::MSG_ReadBitsCompress(from, buffer, size);
if (size > 0x20000) return 0;
std::memcpy(to, buffer, size);
return size;
}
int QuickPatch::SVCanReplaceServerCommand(Game::client_t* /*client*/, const char* /*cmd*/)
{
// This is a fix copied from V2. As I don't have time to investigate, let's simply trust them
return -1;
}
long QuickPatch::AtolAdjustPlayerLimit(const char* string)
{
return std::min(atol(string), 18l);
}
void QuickPatch::SelectStringTableEntryInDvarStub()
{
Command::ClientParams params;
if (params.size() >= 4)
{
const auto* dvarName = params[3];
const auto* dvar = Game::Dvar_FindVar(dvarName);
if (Command::Find(dvarName) ||
(dvar != nullptr && dvar->flags & (Game::DVAR_WRITEPROTECTED | Game::DVAR_CHEAT | Game::DVAR_READONLY)))
{
return;
}
}
Game::CL_SelectStringTableEntryInDvar_f();
}
__declspec(naked) void QuickPatch::JavelinResetHookStub()
{
__asm
@ -117,69 +61,6 @@ namespace Components
}
}
__declspec(naked) int QuickPatch::G_GetClientScore()
{
__asm
{
mov eax, [esp + 4] // index
mov ecx, ds : 1A831A8h // level: &g_clients
test ecx, ecx;
jz invalid_ptr;
imul eax, 366Ch
mov eax, [eax + ecx + 3134h]
ret
invalid_ptr:
xor eax, eax
ret
}
}
bool QuickPatch::InvalidNameCheck(char* dest, const char* source, int size)
{
Utils::Hook::Call<void(char*, const char*, int)>(0x4D6F80)(dest, source, size); // I_strncpyz
for (int i = 0; i < size - 1; i++)
{
if (!dest[i]) break;
if (dest[i] > 125 || dest[i] < 32 || dest[i] == '%')
{
return false;
}
}
return true;
}
__declspec(naked) void QuickPatch::InvalidNameStub()
{
static const char* kick_reason = "Invalid name detected.";
__asm
{
call InvalidNameCheck;
test al, al
jnz returnSafe;
pushad;
push 1;
push kick_reason;
push edi;
mov eax, 0x004D1600; // SV_DropClientInternal
call eax;
add esp, 12;
popad;
returnSafe:
push 0x00401988;
retn;
}
}
Game::dvar_t* QuickPatch::g_antilag;
__declspec(naked) void QuickPatch::ClientEventsFireWeaponStub()
{
@ -378,9 +259,6 @@ namespace Components
Utils::Hook(0x5D6D56, QuickPatch::ClientEventsFireWeaponStub, HOOK_JUMP).install()->quick();
Utils::Hook(0x5D6D6A, QuickPatch::ClientEventsFireWeaponMeleeStub, HOOK_JUMP).install()->quick();
// Disallow invalid player names
Utils::Hook(0x401983, QuickPatch::InvalidNameStub, HOOK_JUMP).install()->quick();
// Javelin fix
Utils::Hook(0x578F52, QuickPatch::JavelinResetHookStub, HOOK_JUMP).install()->quick();
@ -644,21 +522,6 @@ namespace Components
}
});
// Exploit fixes
Utils::Hook::Set<BYTE>(0x412370, 0xC3); // SV_SteamAuthClient
Utils::Hook::Set<BYTE>(0x5A8C70, 0xC3); // CL_HandleRelayPacket
Utils::Hook(0x414D92, QuickPatch::MsgReadBitsCompressCheckSV, HOOK_CALL).install()->quick(); // SV_ExecuteClientCommands
Utils::Hook(0x4A9F56, QuickPatch::MsgReadBitsCompressCheckCL, HOOK_CALL).install()->quick(); // CL_ParseServerMessage
Utils::Hook(0x407376, QuickPatch::SVCanReplaceServerCommand , HOOK_CALL).install()->quick(); // SV_CanReplaceServerCommand
Utils::Hook(0x5B67ED, QuickPatch::AtolAdjustPlayerLimit , HOOK_CALL).install()->quick(); // PartyHost_HandleJoinPartyRequest
Utils::Hook::Nop(0x41698E, 5); // Disable Svcmd_EntityList_f
// Patch selectStringTableEntryInDvar
Utils::Hook::Set(0x405959, QuickPatch::SelectStringTableEntryInDvarStub);
// Patch G_GetClientScore for uninitialised game
Utils::Hook(0x469AC0, QuickPatch::G_GetClientScore, HOOK_JUMP).install()->quick();
// Ignore call to print 'Offhand class mismatch when giving weapon...'
Utils::Hook(0x5D9047, 0x4BB9B0, HOOK_CALL).install()->quick();

13
src/Components/Modules/QuickPatch.hpp
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@ -12,21 +12,8 @@ namespace Components
static void UnlockStats();
private:
static void SelectStringTableEntryInDvarStub();
static int SVCanReplaceServerCommand(Game::client_t *client, const char *cmd);
static int G_GetClientScore();
static int MsgReadBitsCompressCheckSV(const char *from, char *to, int size);
static int MsgReadBitsCompressCheckCL(const char *from, char *to, int size);
static long AtolAdjustPlayerLimit(const char* string);
static void JavelinResetHookStub();
static bool InvalidNameCheck(char* dest, const char* source, int size);
static void InvalidNameStub();
static Dvar::Var r_customAspectRatio;
static Game::dvar_t* Dvar_RegisterAspectRatioDvar(const char* dvarName, const char** valueList, int defaultIndex, unsigned __int16 flags, const char* description);
static void SetAspectRatioStub();

112
src/Components/Modules/Security.cpp Normal file
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@ -0,0 +1,112 @@
#include <STDInclude.hpp>
namespace Components
{
int Security::MsgReadBitsCompressCheckSV(const char* from, char* to, int size)
{
static char buffer[0x8000];
if (size > 0x800) return 0;
size = Game::MSG_ReadBitsCompress(from, buffer, size);
if (size > 0x800) return 0;
std::memcpy(to, buffer, size);
return size;
}
int Security::MsgReadBitsCompressCheckCL(const char* from, char* to, int size)
{
static char buffer[0x100000];
if (size > 0x20000) return 0;
size = Game::MSG_ReadBitsCompress(from, buffer, size);
if (size > 0x20000) return 0;
std::memcpy(to, buffer, size);
return size;
}
int Security::SVCanReplaceServerCommand(Game::client_t* /*client*/, const char* /*cmd*/)
{
// This is a fix copied from V2. As I don't have time to investigate, let's simply trust them
return -1;
}
long Security::AtolAdjustPlayerLimit(const char* string)
{
return std::min<long>(std::atol(string), 18);
}
void Security::SelectStringTableEntryInDvarStub()
{
Command::ClientParams params;
if (params.size() >= 4)
{
const auto* dvarName = params[3];
const auto* dvar = Game::Dvar_FindVar(dvarName);
if (Command::Find(dvarName) ||
(dvar != nullptr && dvar->flags & (Game::DVAR_WRITEPROTECTED | Game::DVAR_CHEAT | Game::DVAR_READONLY)))
{
Logger::Print(0, "CL_SelectStringTableEntryInDvar_f: illegal parameter\n");
return;
}
}
Game::CL_SelectStringTableEntryInDvar_f();
}
__declspec(naked) int Security::G_GetClientScore()
{
__asm
{
mov eax, [esp + 4] // index
mov ecx, ds:1A831A8h // level: &g_clients
test ecx, ecx
jz invalid_ptr
imul eax, 366Ch
mov eax, [eax + ecx + 3134h]
ret
invalid_ptr:
xor eax, eax
ret
}
}
void Security::G_LogPrintfStub(const char* fmt)
{
Game::G_LogPrintf("%s", fmt);
}
Security::Security()
{
// Exploit fixes
Utils::Hook(0x414D92, MsgReadBitsCompressCheckSV, HOOK_CALL).install()->quick(); // SV_ExecuteClientCommands
Utils::Hook(0x4A9F56, MsgReadBitsCompressCheckCL, HOOK_CALL).install()->quick(); // CL_ParseServerMessage
Utils::Hook(0x407376, SVCanReplaceServerCommand, HOOK_CALL).install()->quick(); // SV_CanReplaceServerCommand
Utils::Hook::Set<BYTE>(0x412370, 0xC3); // SV_SteamAuthClient
Utils::Hook::Set<BYTE>(0x5A8C70, 0xC3); // CL_HandleRelayPacket
Utils::Hook::Nop(0x41698E, 5); // Disable Svcmd_EntityList_f
// Patch selectStringTableEntryInDvar
Utils::Hook::Set<void(*)()>(0x405959, Security::SelectStringTableEntryInDvarStub);
// Patch G_GetClientScore for uninitialized game
Utils::Hook(0x469AC0, G_GetClientScore, HOOK_JUMP).install()->quick();
// Requests can be malicious
Utils::Hook(0x5B67ED, AtolAdjustPlayerLimit, HOOK_CALL).install()->quick(); // PartyHost_HandleJoinPartyRequest
// Patch unsecure call to G_LogPrint inside GScr_LogPrint
// This function is unsafe because IW devs forgot to G_LogPrintf("%s", fmt)
Utils::Hook(0x5F70B5, G_LogPrintfStub, HOOK_CALL).install()->quick();
}
}

24
src/Components/Modules/Security.hpp Normal file
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@ -0,0 +1,24 @@
#pragma once
namespace Components
{
class Security : public Component
{
public:
Security();
private:
static int MsgReadBitsCompressCheckSV(const char* from, char* to, int size);
static int MsgReadBitsCompressCheckCL(const char* from, char* to, int size);
static int SVCanReplaceServerCommand(Game::client_t* client, const char* cmd);
static long AtolAdjustPlayerLimit(const char* string);
static void SelectStringTableEntryInDvarStub();
static int G_GetClientScore();
static void G_LogPrintfStub(const char* fmt);
};
}

7
src/Components/Modules/TextRenderer.cpp
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@ -1356,11 +1356,11 @@ namespace Components
if (*in) // height
in++;
if(*in) // material name length + material name characters
if (*in) // material name length + material name characters
{
const auto materialNameLength = *in;
in++;
for(auto i = 0; i < materialNameLength; i++)
for (auto i = 0; i < materialNameLength; i++)
{
if (*in)
in++;
@ -1370,7 +1370,7 @@ namespace Components
continue;
}
if(*in == FONT_ICON_SEPARATOR_CHARACTER)
if (*in == FONT_ICON_SEPARATOR_CHARACTER)
{
const auto* fontIconEndPos = &in[1];
FontIconInfo fontIcon{};
@ -1386,6 +1386,7 @@ namespace Components
++current;
++in;
}
*out = '\0';
}

1
src/Game/Functions.cpp
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@ -150,6 +150,7 @@ namespace Game
FS_IsShippedIWD_t FS_IsShippedIWD = FS_IsShippedIWD_t(0x642440);
FS_Delete_t FS_Delete = FS_Delete_t(0x48A5B0);
G_LogPrintf_t G_LogPrintf = G_LogPrintf_t(0x4B0150);
G_GetWeaponIndexForName_t G_GetWeaponIndexForName = G_GetWeaponIndexForName_t(0x49E540);
G_SpawnEntitiesFromString_t G_SpawnEntitiesFromString = G_SpawnEntitiesFromString_t(0x4D8840);

3
src/Game/Functions.hpp
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@ -371,6 +371,9 @@ namespace Game
typedef int(__cdecl* FS_Delete_t)(const char* fileName);
extern FS_Delete_t FS_Delete;
typedef void(__cdecl * G_LogPrintf_t)(const char* fmt, ...);
extern G_LogPrintf_t G_LogPrintf;
typedef unsigned int(__cdecl * G_GetWeaponIndexForName_t)(const char*);
extern G_GetWeaponIndexForName_t G_GetWeaponIndexForName;

4
src/Utils/String.hpp
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@ -11,7 +11,7 @@ namespace Utils
static_assert(Buffers != 0 && MinBufferSize != 0, "Buffers and MinBufferSize mustn't be 0");
VAProvider() : currentBuffer(0) {}
~VAProvider() {}
~VAProvider() = default;
const char* get(const char* format, va_list ap)
{
@ -25,7 +25,7 @@ namespace Utils
while (true)
{
int res = vsnprintf_s(entry->buffer, entry->size, _TRUNCATE, format, ap);
const auto res = _vsnprintf_s(entry->buffer, entry->size, _TRUNCATE, format, ap);
if (res > 0) break; // Success
if (res == 0) return ""; // Error