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// Copyright 2017 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "DiscIO/NANDImporter.h"
#include <array>
#include <cinttypes>
#include <cstring>
#include "Common/Crypto/AES.h"
#include "Common/FileUtil.h"
#include "Common/MsgHandler.h"
#include "Common/Swap.h"
#include "DiscIO/NANDContentLoader.h"
namespace DiscIO
{
constexpr size_t NAND_SIZE = 0x20000000;
constexpr size_t NAND_KEYS_SIZE = 0x400;
NANDImporter::NANDImporter() = default;
NANDImporter::~NANDImporter() = default;
void NANDImporter::ImportNANDBin(const std::string& path_to_bin,
std::function<void(size_t, size_t)> update_callback)
{
m_update_callback = std::move(update_callback);
if (!ReadNANDBin(path_to_bin))
return;
const std::string nand_root = File::GetUserPath(D_WIIROOT_IDX);
FindSuperblock();
CountEntries(0);
ProcessEntry(0, nand_root);
ExportKeys(nand_root);
ExtractCertificates(nand_root);
// We have to clear the cache so the new NAND takes effect
DiscIO::CNANDContentManager::Access().ClearCache();
}
bool NANDImporter::ReadNANDBin(const std::string& path_to_bin)
{
constexpr size_t NAND_TOTAL_BLOCKS = 0x40000;
constexpr size_t NAND_BLOCK_SIZE = 0x800;
constexpr size_t NAND_ECC_BLOCK_SIZE = 0x40;
constexpr size_t NAND_BIN_SIZE =
(NAND_BLOCK_SIZE + NAND_ECC_BLOCK_SIZE) * NAND_TOTAL_BLOCKS + NAND_KEYS_SIZE; // 0x21000400
File::IOFile file(path_to_bin, "rb");
if (file.GetSize() != NAND_BIN_SIZE)
{
PanicAlertT("This file does not look like a BootMii NAND backup. (0x%" PRIx64
" does not equal 0x%zx)",
file.GetSize(), NAND_BIN_SIZE);
return false;
}
m_nand.resize(NAND_SIZE);
for (size_t i = 0; i < NAND_TOTAL_BLOCKS; i++)
{
file.ReadBytes(&m_nand[i * NAND_BLOCK_SIZE], NAND_BLOCK_SIZE);
file.Seek(NAND_ECC_BLOCK_SIZE, SEEK_CUR); // We don't care about the ECC blocks
}
m_nand_keys.resize(NAND_KEYS_SIZE);
file.ReadBytes(m_nand_keys.data(), NAND_KEYS_SIZE);
return true;
}
void NANDImporter::FindSuperblock()
{
constexpr size_t NAND_SUPERBLOCK_START = 0x1fc00000;
constexpr size_t NAND_SUPERBLOCK_SIZE = 0x40000;
size_t superblock = 0;
u32 newest_version = 0;
for (size_t pos = NAND_SUPERBLOCK_START; pos < NAND_SIZE; pos += NAND_SUPERBLOCK_SIZE)
{
if (!memcmp(m_nand.data() + pos, "SFFS", 4))
{
u32 version = Common::swap32(&m_nand[pos + 4]);
if (superblock == 0 || version > newest_version)
{
superblock = pos;
newest_version = version;
}
}
}
m_nand_fat_offset = superblock + 0xC;
m_nand_fst_offset = m_nand_fat_offset + 0x10000;
}
std::string NANDImporter::GetPath(const NANDFSTEntry& entry, const std::string& parent_path)
{
std::string name(reinterpret_cast<const char*>(&entry.name), sizeof(NANDFSTEntry::name));
// Get rid of any extra null characters
while (name.back() == '\0')
name.pop_back();
if (name.front() == '/' || parent_path.back() == '/')
return parent_path + name;
return parent_path + '/' + name;
}
void NANDImporter::ProcessEntry(u16 entry_number, const std::string& parent_path)
{
NANDFSTEntry entry;
memcpy(&entry, &m_nand[m_nand_fst_offset + sizeof(NANDFSTEntry) * Common::swap16(entry_number)],
sizeof(NANDFSTEntry));
UpdateStatus();
if (entry.sib != 0xffff)
ProcessEntry(entry.sib, parent_path);
if ((entry.mode & 3) == 1)
ProcessFile(entry, parent_path);
else if ((entry.mode & 3) == 2)
ProcessDirectory(entry, parent_path);
}
void NANDImporter::ProcessDirectory(const NANDFSTEntry& entry, const std::string& parent_path)
{
const std::string path = GetPath(entry, parent_path);
File::CreateDir(path);
if (entry.sub != 0xffff)
ProcessEntry(entry.sub, path);
}
void NANDImporter::ProcessFile(const NANDFSTEntry& entry, const std::string& parent_path)
{
constexpr size_t NAND_AES_KEY_OFFSET = 0x158;
constexpr size_t NAND_FAT_BLOCK_SIZE = 0x4000;
const std::string path = GetPath(entry, parent_path);
File::IOFile file(path, "wb");
std::array<u8, 16> key{};
std::copy(&m_nand_keys[NAND_AES_KEY_OFFSET], &m_nand_keys[NAND_AES_KEY_OFFSET + key.size()],
key.begin());
u16 sub = Common::swap16(entry.sub);
u32 remaining_bytes = Common::swap32(entry.size);
while (remaining_bytes > 0)
{
std::array<u8, 16> iv{};
std::vector<u8> block = Common::AES::Decrypt(
key.data(), iv.data(), &m_nand[NAND_FAT_BLOCK_SIZE * sub], NAND_FAT_BLOCK_SIZE);
u32 size = remaining_bytes < NAND_FAT_BLOCK_SIZE ? remaining_bytes : NAND_FAT_BLOCK_SIZE;
file.WriteBytes(block.data(), size);
remaining_bytes -= size;
sub = Common::swap16(&m_nand[m_nand_fat_offset + 2 * sub]);
}
}
void NANDImporter::ExtractCertificates(const std::string& nand_root)
{
const std::string title_contents_path =
nand_root + "/title/00000001/0000000d/content/00000011.app";
File::IOFile file(title_contents_path, "rb");
if (!file)
{
PanicAlertT("Unable to open %s! Refer to "
"https://dolphin-emu.org/docs/guides/wii-network-guide/ to set up "
"certificates.",
title_contents_path.c_str());
return;
}
struct Certificate
{
u32 offset;
u32 size;
std::string filename;
};
std::array<Certificate, 3> certificates = {{{0x92834, 1005, "/clientca.pem"},
{0x92d38, 609, "/clientcakey.pem"},
{0x92440, 897, "/rootca.pem"}}};
for (const Certificate& cert : certificates)
{
file.Seek(cert.offset, SEEK_SET);
std::vector<u8> pem_cert(cert.size);
file.ReadBytes(pem_cert.data(), pem_cert.size());
const std::string pem_file_path = nand_root + cert.filename;
File::IOFile pem_file(pem_file_path, "wb");
if (!pem_file.WriteBytes(pem_cert.data(), pem_cert.size()))
PanicAlertT("Unable to write to file %s", pem_file_path.c_str());
}
}
void NANDImporter::ExportKeys(const std::string& nand_root)
{
const std::string file_path = nand_root + "/keys.bin";
File::IOFile file(file_path, "wb");
if (!file.WriteBytes(m_nand_keys.data(), NAND_KEYS_SIZE))
PanicAlertT("Unable to write to file %s", file_path.c_str());
}
void NANDImporter::CountEntries(u16 entry_number)
{
NANDFSTEntry entry;
memcpy(&entry, &m_nand[m_nand_fst_offset + sizeof(NANDFSTEntry) * Common::swap16(entry_number)],
sizeof(NANDFSTEntry));
m_total_entries++;
if (entry.sib != 0xffff)
CountEntries(entry.sib);
if ((entry.mode & 3) == 2 && entry.sub != 0xffff)
CountEntries(entry.sub);
}
void NANDImporter::UpdateStatus()
{
m_update_callback(m_current_entry++, m_total_entries);
}
}
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