mirror of
https://github.com/libretro/dolphin
synced 2024-09-19 12:05:10 -04:00
276 lines
9 KiB
C++
276 lines
9 KiB
C++
// Copyright 2017 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#include "DiscIO/NANDImporter.h"
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#include <algorithm>
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#include <array>
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#include <cinttypes>
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#include <cstring>
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#include "Common/Crypto/AES.h"
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#include "Common/File.h"
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#include "Common/FileUtil.h"
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#include "Common/Logging/Log.h"
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#include "Common/MsgHandler.h"
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#include "Common/StringUtil.h"
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#include "Common/Swap.h"
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#include "Core/IOS/ES/Formats.h"
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namespace DiscIO
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{
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constexpr size_t NAND_SIZE = 0x20000000;
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constexpr size_t NAND_KEYS_SIZE = 0x400;
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NANDImporter::NANDImporter() = default;
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NANDImporter::~NANDImporter() = default;
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void NANDImporter::ImportNANDBin(const std::string& path_to_bin,
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std::function<void()> update_callback,
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std::function<std::string()> get_otp_dump_path)
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{
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m_update_callback = std::move(update_callback);
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if (!ReadNANDBin(path_to_bin, get_otp_dump_path))
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return;
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const std::string nand_root = File::GetUserPath(D_WIIROOT_IDX);
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m_nand_root_length = nand_root.length();
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if (nand_root.back() == '/')
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m_nand_root_length++;
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FindSuperblock();
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ProcessEntry(0, nand_root);
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ExportKeys(nand_root);
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ExtractCertificates(nand_root);
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}
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bool NANDImporter::ReadNANDBin(const std::string& path_to_bin,
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std::function<std::string()> get_otp_dump_path)
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{
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constexpr size_t NAND_TOTAL_BLOCKS = 0x40000;
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constexpr size_t NAND_BLOCK_SIZE = 0x800;
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constexpr size_t NAND_ECC_BLOCK_SIZE = 0x40;
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constexpr size_t NAND_BIN_SIZE =
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(NAND_BLOCK_SIZE + NAND_ECC_BLOCK_SIZE) * NAND_TOTAL_BLOCKS; // 0x21000000
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File::IOFile file(path_to_bin, "rb");
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const u64 image_size = file.GetSize();
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if (image_size != NAND_BIN_SIZE + NAND_KEYS_SIZE && image_size != NAND_BIN_SIZE)
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{
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PanicAlertT("This file does not look like a BootMii NAND backup.");
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return false;
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}
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m_nand.resize(NAND_SIZE);
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for (size_t i = 0; i < NAND_TOTAL_BLOCKS; i++)
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{
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// Instead of updating on every cycle, we only update every 1000 cycles for a balance between
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// not updating fast enough vs updating too fast
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if (i % 1000 == 0)
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m_update_callback();
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file.ReadBytes(&m_nand[i * NAND_BLOCK_SIZE], NAND_BLOCK_SIZE);
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file.Seek(NAND_ECC_BLOCK_SIZE, SEEK_CUR); // We don't care about the ECC blocks
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}
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m_nand_keys.resize(NAND_KEYS_SIZE);
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// Read the OTP/SEEPROM dump.
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// If it is not included in the NAND image, get a path to the dump and read key data from it.
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if (image_size == NAND_BIN_SIZE)
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{
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const std::string otp_dump_path = get_otp_dump_path();
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if (otp_dump_path.empty())
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return false;
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File::IOFile keys_file{otp_dump_path, "rb"};
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return keys_file.ReadBytes(m_nand_keys.data(), NAND_KEYS_SIZE);
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}
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// Otherwise, just read the key data from the NAND image.
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return file.ReadBytes(m_nand_keys.data(), NAND_KEYS_SIZE);
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}
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void NANDImporter::FindSuperblock()
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{
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constexpr size_t NAND_SUPERBLOCK_START = 0x1fc00000;
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constexpr size_t NAND_SUPERBLOCK_SIZE = 0x40000;
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size_t superblock = 0;
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u32 newest_version = 0;
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for (size_t pos = NAND_SUPERBLOCK_START; pos < NAND_SIZE; pos += NAND_SUPERBLOCK_SIZE)
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{
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if (!memcmp(m_nand.data() + pos, "SFFS", 4))
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{
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u32 version = Common::swap32(&m_nand[pos + 4]);
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INFO_LOG(DISCIO, "Found superblock at 0x%zx with version 0x%x", pos, version);
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if (superblock == 0 || version > newest_version)
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{
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superblock = pos;
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newest_version = version;
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}
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}
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}
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m_nand_fat_offset = superblock + 0xC;
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m_nand_fst_offset = m_nand_fat_offset + 0x10000;
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INFO_LOG(DISCIO, "Using superblock version 0x%x at position 0x%zx. FAT/FST offset: 0x%zx/0x%zx",
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newest_version, superblock, m_nand_fat_offset, m_nand_fst_offset);
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}
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std::string NANDImporter::GetPath(const NANDFSTEntry& entry, const std::string& parent_path)
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{
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std::string name(entry.name, strnlen(entry.name, sizeof(NANDFSTEntry::name)));
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if (name.front() == '/' || parent_path.back() == '/')
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return parent_path + name;
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return parent_path + '/' + name;
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}
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std::string NANDImporter::FormatDebugString(const NANDFSTEntry& entry)
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{
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return StringFromFormat("%12.12s 0x%02x 0x%02x 0x%04x 0x%04x 0x%08x 0x%04x 0x%04x 0x%04x 0x%08x",
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entry.name, entry.mode, entry.attr, entry.sub, entry.sib, entry.size,
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entry.x1, entry.uid, entry.gid, entry.x3);
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}
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void NANDImporter::ProcessEntry(u16 entry_number, const std::string& parent_path)
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{
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NANDFSTEntry entry;
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memcpy(&entry, &m_nand[m_nand_fst_offset + sizeof(NANDFSTEntry) * Common::swap16(entry_number)],
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sizeof(NANDFSTEntry));
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if (entry.sib != 0xffff)
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ProcessEntry(entry.sib, parent_path);
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if ((entry.mode & 3) == 1)
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ProcessFile(entry, parent_path);
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else if ((entry.mode & 3) == 2)
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ProcessDirectory(entry, parent_path);
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else
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ERROR_LOG(DISCIO, "Unknown mode: %s", FormatDebugString(entry).c_str());
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}
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void NANDImporter::ProcessDirectory(const NANDFSTEntry& entry, const std::string& parent_path)
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{
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m_update_callback();
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INFO_LOG(DISCIO, "Path: %s", FormatDebugString(entry).c_str());
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const std::string path = GetPath(entry, parent_path);
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File::CreateDir(path);
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if (entry.sub != 0xffff)
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ProcessEntry(entry.sub, path);
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INFO_LOG(DISCIO, "Path: %s", parent_path.c_str() + m_nand_root_length);
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}
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void NANDImporter::ProcessFile(const NANDFSTEntry& entry, const std::string& parent_path)
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{
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constexpr size_t NAND_AES_KEY_OFFSET = 0x158;
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constexpr size_t NAND_FAT_BLOCK_SIZE = 0x4000;
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m_update_callback();
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INFO_LOG(DISCIO, "File: %s", FormatDebugString(entry).c_str());
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const std::string path = GetPath(entry, parent_path);
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File::IOFile file(path, "wb");
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std::array<u8, 16> key{};
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std::copy(&m_nand_keys[NAND_AES_KEY_OFFSET], &m_nand_keys[NAND_AES_KEY_OFFSET + key.size()],
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key.begin());
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u16 sub = Common::swap16(entry.sub);
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u32 remaining_bytes = Common::swap32(entry.size);
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while (remaining_bytes > 0)
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{
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std::array<u8, 16> iv{};
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std::vector<u8> block = Common::AES::Decrypt(
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key.data(), iv.data(), &m_nand[NAND_FAT_BLOCK_SIZE * sub], NAND_FAT_BLOCK_SIZE);
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u32 size = remaining_bytes < NAND_FAT_BLOCK_SIZE ? remaining_bytes : NAND_FAT_BLOCK_SIZE;
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file.WriteBytes(block.data(), size);
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remaining_bytes -= size;
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sub = Common::swap16(&m_nand[m_nand_fat_offset + 2 * sub]);
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}
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}
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bool NANDImporter::ExtractCertificates(const std::string& nand_root)
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{
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const std::string content_dir = nand_root + "/title/00000001/0000000d/content/";
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File::IOFile tmd_file(content_dir + "title.tmd", "rb");
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std::vector<u8> tmd_bytes(tmd_file.GetSize());
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if (!tmd_file.ReadBytes(tmd_bytes.data(), tmd_bytes.size()))
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{
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ERROR_LOG(DISCIO, "ExtractCertificates: Could not read IOS13 TMD");
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return false;
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}
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IOS::ES::TMDReader tmd(std::move(tmd_bytes));
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IOS::ES::Content content_metadata;
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if (!tmd.GetContent(tmd.GetBootIndex(), &content_metadata))
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{
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ERROR_LOG(DISCIO, "ExtractCertificates: Could not get content ID from TMD");
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return false;
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}
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File::IOFile content_file(content_dir + StringFromFormat("%08x.app", content_metadata.id), "rb");
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std::vector<u8> content_bytes(content_file.GetSize());
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if (!content_file.ReadBytes(content_bytes.data(), content_bytes.size()))
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{
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ERROR_LOG(DISCIO, "ExtractCertificates: Could not read IOS13 contents");
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return false;
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}
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struct PEMCertificate
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{
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std::string filename;
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std::array<u8, 4> search_bytes;
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};
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std::array<PEMCertificate, 3> certificates = {{
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{"/clientca.pem", {{0x30, 0x82, 0x03, 0xE9}}},
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{"/clientcakey.pem", {{0x30, 0x82, 0x02, 0x5D}}},
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{"/rootca.pem", {{0x30, 0x82, 0x03, 0x7D}}},
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}};
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for (const PEMCertificate& certificate : certificates)
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{
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const auto search_result =
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std::search(content_bytes.begin(), content_bytes.end(), certificate.search_bytes.begin(),
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certificate.search_bytes.end());
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if (search_result == content_bytes.end())
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{
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ERROR_LOG(DISCIO, "ExtractCertificates: Could not find offset for certficate '%s'",
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certificate.filename.c_str());
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return false;
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}
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const std::string pem_file_path = nand_root + certificate.filename;
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const ptrdiff_t certificate_offset = std::distance(content_bytes.begin(), search_result);
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const u16 certificate_size = Common::swap16(&content_bytes[certificate_offset - 2]);
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INFO_LOG(DISCIO, "ExtractCertificates: '%s' offset: 0x%tx size: 0x%x",
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certificate.filename.c_str(), certificate_offset, certificate_size);
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File::IOFile pem_file(pem_file_path, "wb");
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if (!pem_file.WriteBytes(&content_bytes[certificate_offset], certificate_size))
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{
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ERROR_LOG(DISCIO, "ExtractCertificates: Unable to write to file %s", pem_file_path.c_str());
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return false;
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}
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}
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return true;
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}
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void NANDImporter::ExportKeys(const std::string& nand_root)
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{
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const std::string file_path = nand_root + "/keys.bin";
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File::IOFile file(file_path, "wb");
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if (!file.WriteBytes(m_nand_keys.data(), NAND_KEYS_SIZE))
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PanicAlertT("Unable to write to file %s", file_path.c_str());
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}
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} // namespace DiscIO
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