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// Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "Privilege check" project.
// For details, see https://github.com/egor-tensin/privilege-check.
// Distributed under the MIT License.
#include "error.hpp"
#include "handle.hpp"
#include "os.hpp"
#include "sid.hpp"
#include <Windows.h>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>
namespace token
{
Handle open_for_process(
const Handle& process,
DWORD permissions)
{
HANDLE raw;
if (!OpenProcessToken(process, permissions, &raw))
error::raise("OpenProcessToken");
return Handle{raw};
}
Handle open_for_current_process(
DWORD permissions)
{
return open_for_process(Handle{GetCurrentProcess()}, permissions);
}
bool get_linked(Handle& token)
{
if (!os::is_vista_or_later())
return false;
auto type = TokenElevationTypeDefault;
DWORD cb = 0;
if (!GetTokenInformation(token, TokenElevationType, &type, sizeof(type), &cb))
error::raise("GetTokenInformation");
if (type != TokenElevationTypeLimited)
return false;
HANDLE raw;
if (!GetTokenInformation(token, TokenLinkedToken, &raw, sizeof(raw), &cb))
error::raise("GetTokenInformation");
token = Handle{raw};
return true;
}
Handle get_for_identification(const Handle& token)
{
HANDLE raw;
if (!DuplicateToken(token, SecurityIdentification, &raw))
error::raise("DuplicateToken");
return Handle{raw};
}
//
// FUNCTION: query_integrity_level()
//
// RETURN VALUE: Returns the integrity level of the current process. It is
// usually one of these values:
//
// SECURITY_MANDATORY_UNTRUSTED_RID (SID: S-1-16-0x0)
// Means untrusted level. It is used by processes started by the
// Anonymous group. Blocks most write access.
//
// SECURITY_MANDATORY_LOW_RID (SID: S-1-16-0x1000)
// Means low integrity level. It is used by Protected Mode Internet
// Explorer. Blocks write acess to most objects (such as files and
// registry keys) on the system.
//
// SECURITY_MANDATORY_MEDIUM_RID (SID: S-1-16-0x2000)
// Means medium integrity level. It is used by normal applications
// being launched while UAC is enabled.
//
// SECURITY_MANDATORY_HIGH_RID (SID: S-1-16-0x3000)
// Means high integrity level. It is used by administrative applications
// launched through elevation when UAC is enabled, or normal
// applications if UAC is disabled and the user is an administrator.
//
// SECURITY_MANDATORY_SYSTEM_RID (SID: S-1-16-0x4000)
// Means system integrity level. It is used by services and other
// system-level applications (such as Wininit, Winlogon, Smss, etc.)
//
DWORD query_integrity_level(const Handle& token)
{
DWORD cb = 0;
if (!GetTokenInformation(token, TokenIntegrityLevel, NULL, 0, &cb))
{
switch (GetLastError())
{
case ERROR_INSUFFICIENT_BUFFER:
break;
default:
error::raise("GetTokenInformation");
}
}
std::vector<unsigned char> buf(cb);
const auto token_level = reinterpret_cast<TOKEN_MANDATORY_LABEL*>(buf.data());
if (!GetTokenInformation(token, TokenIntegrityLevel, token_level, cb, &cb))
error::raise("GetTokenInformation");
// Integrity Level SIDs are in the form of S-1-16-0xXXXX. (e.g.
// S-1-16-0x1000 stands for low integrity level SID). There is one and
// only one subauthority.
return *GetSidSubAuthority(token_level->Label.Sid, 0);
}
std::wstring integrity_level_to_string(DWORD level)
{
static const std::unordered_map<DWORD, const wchar_t*> names =
{
{SECURITY_MANDATORY_UNTRUSTED_RID, L"Untrusted"},
{SECURITY_MANDATORY_LOW_RID, L"Low"},
{SECURITY_MANDATORY_MEDIUM_RID, L"Medium"},
{SECURITY_MANDATORY_HIGH_RID, L"High"},
{SECURITY_MANDATORY_SYSTEM_RID, L"System"},
};
static constexpr auto unknown_name = L"Unknown";
const auto it = names.find(level);
if (it == names.cend())
return unknown_name;
return it->second;
}
bool check_belongs(const Handle& token, const SidBuffer& sid)
{
BOOL b = FALSE;
if (!CheckTokenMembership(token, const_cast<unsigned char*>(sid.data()), &b))
error::raise("CheckTokenMembership");
return b != FALSE;
}
bool query_elevation(const Handle& token)
{
TOKEN_ELEVATION elevation;
DWORD cb = 0;
if (!GetTokenInformation(token, TokenElevation, &elevation, sizeof(elevation), &cb))
error::raise("GetTokenInformation");
return elevation.TokenIsElevated != 0;
}
}
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