You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
306 lines
7.1 KiB
306 lines
7.1 KiB
#include "kernel_ctx.h"
|
|
#include "../mem_ctx/mem_ctx.hpp"
|
|
|
|
namespace nasa
|
|
{
|
|
kernel_ctx::kernel_ctx()
|
|
{
|
|
if (psyscall_func.load() || nt_page_offset || ntoskrnl_buffer)
|
|
return;
|
|
|
|
nt_rva = reinterpret_cast<std::uint32_t>(
|
|
util::get_kernel_export(
|
|
"ntoskrnl.exe",
|
|
syscall_hook.first.data(),
|
|
true
|
|
));
|
|
|
|
nt_page_offset = nt_rva % PAGE_SIZE;
|
|
ntoskrnl_buffer = reinterpret_cast<std::uint8_t*>(LoadLibraryA(ntoskrnl_path));
|
|
|
|
DBG_PRINT("[+] page offset of %s is 0x%llx\n", syscall_hook.first.data(), nt_page_offset);
|
|
DBG_PRINT("[+] ntoskrnl_buffer: 0x%p\n", ntoskrnl_buffer);
|
|
DBG_PRINT("[!] ntoskrnl_buffer was 0x%p, nt_rva was 0x%p\n", ntoskrnl_buffer, nt_rva);
|
|
|
|
std::vector<std::thread> search_threads;
|
|
//--- for each physical memory range, make a thread to search it
|
|
for (auto ranges : util::pmem_ranges)
|
|
search_threads.emplace_back(std::thread(
|
|
&kernel_ctx::map_syscall,
|
|
this,
|
|
ranges.first,
|
|
ranges.second
|
|
));
|
|
|
|
for (std::thread& search_thread : search_threads)
|
|
search_thread.join();
|
|
|
|
DBG_PRINT("[+] psyscall_func: 0x%p\n", psyscall_func.load());
|
|
}
|
|
|
|
void kernel_ctx::map_syscall(std::uintptr_t begin, std::uintptr_t end) const
|
|
{
|
|
//if the physical memory range is less then or equal to 2mb
|
|
if (begin + end <= 0x1000 * 512)
|
|
{
|
|
auto page_va = nasa::map_phys(begin + nt_page_offset, end);
|
|
if (page_va)
|
|
{
|
|
// scan every page of the physical memory range
|
|
for (auto page = page_va; page < page_va + end; page += 0x1000)
|
|
if (!psyscall_func.load()) // keep scanning until its found
|
|
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
|
|
{
|
|
psyscall_func.store((void*)page);
|
|
return;
|
|
}
|
|
nasa::unmap_phys(page_va, end);
|
|
}
|
|
}
|
|
else // else the range is bigger then 2mb
|
|
{
|
|
auto remainder = (begin + end) % (0x1000 * 512);
|
|
|
|
// loop over 2m chunks
|
|
for (auto range = begin; range < begin + end; range += 0x1000 * 512)
|
|
{
|
|
auto page_va = nasa::map_phys(range + nt_page_offset, 0x1000 * 512);
|
|
if (page_va)
|
|
{
|
|
// loop every page of 2mbs (512)
|
|
for (auto page = page_va; page < page_va + 0x1000 * 512; page += 0x1000)
|
|
{
|
|
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
|
|
{
|
|
psyscall_func.store((void*)page);
|
|
return;
|
|
}
|
|
}
|
|
nasa::unmap_phys(page_va, 0x1000 * 512);
|
|
}
|
|
}
|
|
|
|
// map the remainder and check each page of it
|
|
auto page_va = nasa::map_phys(begin + end - remainder + nt_page_offset, remainder);
|
|
if (page_va)
|
|
{
|
|
for (auto page = page_va; page < page_va + remainder; page += 0x1000)
|
|
{
|
|
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
|
|
{
|
|
psyscall_func.store((void*)page);
|
|
return;
|
|
}
|
|
}
|
|
nasa::unmap_phys(page_va, remainder);
|
|
}
|
|
}
|
|
}
|
|
|
|
PEPROCESS kernel_ctx::get_peprocess(DWORD pid)
|
|
{
|
|
if (!pid)
|
|
return NULL;
|
|
|
|
PEPROCESS proc;
|
|
static auto get_peprocess_from_pid =
|
|
util::get_kernel_export(
|
|
"ntoskrnl.exe",
|
|
"PsLookupProcessByProcessId"
|
|
);
|
|
|
|
syscall<PsLookupProcessByProcessId>(
|
|
get_peprocess_from_pid,
|
|
(HANDLE)pid,
|
|
&proc
|
|
);
|
|
return proc;
|
|
}
|
|
|
|
void kernel_ctx::rkm(void* buffer, void* address, std::size_t size)
|
|
{
|
|
if (!buffer || !address || !size)
|
|
return;
|
|
|
|
size_t amount_copied;
|
|
static auto mm_copy_memory =
|
|
util::get_kernel_export(
|
|
"ntoskrnl.exe",
|
|
"memcpy"
|
|
);
|
|
|
|
if (mm_copy_memory)
|
|
syscall<decltype(&memcpy)>(
|
|
mm_copy_memory,
|
|
buffer,
|
|
address,
|
|
size
|
|
);
|
|
}
|
|
|
|
void kernel_ctx::wkm(void* buffer, void* address, std::size_t size)
|
|
{
|
|
if (!buffer || !address || !size)
|
|
return;
|
|
|
|
size_t amount_copied;
|
|
static auto mm_copy_memory =
|
|
util::get_kernel_export(
|
|
"ntoskrnl.exe",
|
|
"memcpy"
|
|
);
|
|
|
|
if (mm_copy_memory)
|
|
syscall<decltype(&memcpy)>(
|
|
mm_copy_memory,
|
|
address,
|
|
buffer,
|
|
size
|
|
);
|
|
}
|
|
|
|
void* kernel_ctx::get_physical(void* virt_addr)
|
|
{
|
|
if (!virt_addr)
|
|
return NULL;
|
|
|
|
static auto mm_get_physical =
|
|
util::get_kernel_export(
|
|
"ntoskrnl.exe",
|
|
"MmGetPhysicalAddress"
|
|
);
|
|
|
|
return syscall<MmGetPhysicalAddress>(
|
|
mm_get_physical,
|
|
virt_addr
|
|
);
|
|
}
|
|
|
|
void* kernel_ctx::get_virtual(void* addr)
|
|
{
|
|
if (!addr)
|
|
return NULL;
|
|
|
|
static auto mm_get_virtual =
|
|
util::get_kernel_export(
|
|
"ntoskrnl.exe",
|
|
"MmGetVirtualForPhysical"
|
|
);
|
|
|
|
PHYSICAL_ADDRESS phys_addr;
|
|
memcpy(&phys_addr, &addr, sizeof(addr));
|
|
return syscall<MmGetVirtualForPhysical>(
|
|
mm_get_virtual,
|
|
phys_addr
|
|
);
|
|
}
|
|
|
|
bool kernel_ctx::clear_piddb_cache(const std::string& file_name, const std::uint32_t timestamp)
|
|
{
|
|
static const auto piddb_lock =
|
|
util::memory::get_piddb_lock();
|
|
|
|
static const auto piddb_table =
|
|
util::memory::get_piddb_table();
|
|
|
|
if (!piddb_lock || !piddb_table)
|
|
return false;
|
|
|
|
static const auto ex_acquire_resource =
|
|
util::get_kernel_export(
|
|
"ntoskrnl.exe",
|
|
"ExAcquireResourceExclusiveLite"
|
|
);
|
|
|
|
static const auto lookup_element_table =
|
|
util::get_kernel_export(
|
|
"ntoskrnl.exe",
|
|
"RtlLookupElementGenericTableAvl"
|
|
);
|
|
|
|
static const auto release_resource =
|
|
util::get_kernel_export(
|
|
"ntoskrnl.exe",
|
|
"ExReleaseResourceLite"
|
|
);
|
|
|
|
static const auto delete_table_entry =
|
|
util::get_kernel_export(
|
|
"ntoskrnl.exe",
|
|
"RtlDeleteElementGenericTableAvl"
|
|
);
|
|
|
|
if (!ex_acquire_resource || !lookup_element_table || !release_resource)
|
|
return false;
|
|
|
|
PiDDBCacheEntry cache_entry;
|
|
const auto drv_name = std::wstring(file_name.begin(), file_name.end());
|
|
cache_entry.time_stamp = timestamp;
|
|
RtlInitUnicodeString(&cache_entry.driver_name, drv_name.data());
|
|
|
|
//
|
|
// ExAcquireResourceExclusiveLite
|
|
//
|
|
if (!syscall<ExAcquireResourceExclusiveLite>(ex_acquire_resource, piddb_lock, true))
|
|
return false;
|
|
|
|
//
|
|
// RtlLookupElementGenericTableAvl
|
|
//
|
|
PIDCacheobj* found_entry_ptr =
|
|
syscall<RtlLookupElementGenericTableAvl>(
|
|
lookup_element_table,
|
|
piddb_table,
|
|
reinterpret_cast<void*>(&cache_entry)
|
|
);
|
|
|
|
if (found_entry_ptr)
|
|
{
|
|
|
|
//
|
|
// unlink entry.
|
|
//
|
|
PIDCacheobj found_entry = rkm<PIDCacheobj>(found_entry_ptr);
|
|
LIST_ENTRY NextEntry = rkm<LIST_ENTRY>(found_entry.list.Flink);
|
|
LIST_ENTRY PrevEntry = rkm<LIST_ENTRY>(found_entry.list.Blink);
|
|
|
|
PrevEntry.Flink = found_entry.list.Flink;
|
|
NextEntry.Blink = found_entry.list.Blink;
|
|
|
|
wkm<LIST_ENTRY>(found_entry.list.Blink, PrevEntry);
|
|
wkm<LIST_ENTRY>(found_entry.list.Flink, NextEntry);
|
|
|
|
//
|
|
// delete entry.
|
|
//
|
|
syscall<RtlDeleteElementGenericTableAvl>(delete_table_entry, piddb_table, found_entry_ptr);
|
|
|
|
//
|
|
// ensure the entry is 0
|
|
//
|
|
auto result = syscall<RtlLookupElementGenericTableAvl>(
|
|
lookup_element_table,
|
|
piddb_table,
|
|
reinterpret_cast<void*>(&cache_entry)
|
|
);
|
|
|
|
syscall<ExReleaseResourceLite>(release_resource, piddb_lock);
|
|
return !result;
|
|
}
|
|
syscall<ExReleaseResourceLite>(release_resource, piddb_lock);
|
|
return false;
|
|
}
|
|
|
|
void kernel_ctx::fix_syscall(nasa::mem_ctx& ctx)
|
|
{
|
|
pt_entries syscall_entries; // not used.
|
|
nasa::psyscall_func =
|
|
ctx.set_page(
|
|
ctx.virt_to_phys(
|
|
syscall_entries,
|
|
nasa::psyscall_func
|
|
));
|
|
|
|
nasa::unmap_all();
|
|
}
|
|
} |