7d8f115185
done automatically by executing regex replace `([^:0-9a-zA-Z_])size_t([^0-9a-zA-Z_])` -> `$1std::size_t$2`
603 lines
25 KiB
C++
603 lines
25 KiB
C++
// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <cinttypes>
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#include <cstring>
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#include <memory>
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#include <cryptopp/aes.h>
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#include <cryptopp/modes.h>
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#include "common/common_types.h"
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#include "common/logging/log.h"
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#include "core/core.h"
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#include "core/file_sys/ncch_container.h"
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#include "core/hw/aes/key.h"
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#include "core/loader/loader.h"
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// FileSys namespace
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namespace FileSys {
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static const int kMaxSections = 8; ///< Maximum number of sections (files) in an ExeFs
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static const int kBlockSize = 0x200; ///< Size of ExeFS blocks (in bytes)
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/**
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* Get the decompressed size of an LZSS compressed ExeFS file
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* @param buffer Buffer of compressed file
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* @param size Size of compressed buffer
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* @return Size of decompressed buffer
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*/
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static u32 LZSS_GetDecompressedSize(const u8* buffer, u32 size) {
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u32 offset_size;
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std::memcpy(&offset_size, buffer + size - sizeof(u32), sizeof(u32));
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return offset_size + size;
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}
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/**
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* Decompress ExeFS file (compressed with LZSS)
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* @param compressed Compressed buffer
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* @param compressed_size Size of compressed buffer
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* @param decompressed Decompressed buffer
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* @param decompressed_size Size of decompressed buffer
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* @return True on success, otherwise false
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*/
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static bool LZSS_Decompress(const u8* compressed, u32 compressed_size, u8* decompressed,
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u32 decompressed_size) {
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const u8* footer = compressed + compressed_size - 8;
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u32 buffer_top_and_bottom;
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std::memcpy(&buffer_top_and_bottom, footer, sizeof(u32));
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u32 out = decompressed_size;
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u32 index = compressed_size - ((buffer_top_and_bottom >> 24) & 0xFF);
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u32 stop_index = compressed_size - (buffer_top_and_bottom & 0xFFFFFF);
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memset(decompressed, 0, decompressed_size);
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memcpy(decompressed, compressed, compressed_size);
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while (index > stop_index) {
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u8 control = compressed[--index];
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for (unsigned i = 0; i < 8; i++) {
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if (index <= stop_index)
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break;
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if (index <= 0)
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break;
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if (out <= 0)
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break;
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if (control & 0x80) {
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// Check if compression is out of bounds
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if (index < 2)
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return false;
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index -= 2;
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u32 segment_offset = compressed[index] | (compressed[index + 1] << 8);
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u32 segment_size = ((segment_offset >> 12) & 15) + 3;
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segment_offset &= 0x0FFF;
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segment_offset += 2;
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// Check if compression is out of bounds
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if (out < segment_size)
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return false;
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for (unsigned j = 0; j < segment_size; j++) {
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// Check if compression is out of bounds
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if (out + segment_offset >= decompressed_size)
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return false;
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u8 data = decompressed[out + segment_offset];
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decompressed[--out] = data;
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}
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} else {
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// Check if compression is out of bounds
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if (out < 1)
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return false;
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decompressed[--out] = compressed[--index];
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}
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control <<= 1;
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}
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}
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return true;
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}
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NCCHContainer::NCCHContainer(const std::string& filepath, u32 ncch_offset)
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: ncch_offset(ncch_offset), filepath(filepath) {
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file = FileUtil::IOFile(filepath, "rb");
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}
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Loader::ResultStatus NCCHContainer::OpenFile(const std::string& filepath, u32 ncch_offset) {
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this->filepath = filepath;
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this->ncch_offset = ncch_offset;
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file = FileUtil::IOFile(filepath, "rb");
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if (!file.IsOpen()) {
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LOG_WARNING(Service_FS, "Failed to open {}", filepath);
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return Loader::ResultStatus::Error;
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}
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LOG_DEBUG(Service_FS, "Opened {}", filepath);
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return Loader::ResultStatus::Success;
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}
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Loader::ResultStatus NCCHContainer::Load() {
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LOG_INFO(Service_FS, "Loading NCCH from file {}", filepath);
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if (is_loaded)
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return Loader::ResultStatus::Success;
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if (file.IsOpen()) {
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// Reset read pointer in case this file has been read before.
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file.Seek(ncch_offset, SEEK_SET);
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if (file.ReadBytes(&ncch_header, sizeof(NCCH_Header)) != sizeof(NCCH_Header))
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return Loader::ResultStatus::Error;
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// Skip NCSD header and load first NCCH (NCSD is just a container of NCCH files)...
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if (Loader::MakeMagic('N', 'C', 'S', 'D') == ncch_header.magic) {
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LOG_DEBUG(Service_FS, "Only loading the first (bootable) NCCH within the NCSD file!");
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ncch_offset += 0x4000;
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file.Seek(ncch_offset, SEEK_SET);
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file.ReadBytes(&ncch_header, sizeof(NCCH_Header));
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}
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// Verify we are loading the correct file type...
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if (Loader::MakeMagic('N', 'C', 'C', 'H') != ncch_header.magic)
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return Loader::ResultStatus::ErrorInvalidFormat;
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has_header = true;
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bool failed_to_decrypt = false;
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if (!ncch_header.no_crypto) {
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is_encrypted = true;
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// Find primary and secondary keys
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if (ncch_header.fixed_key) {
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LOG_DEBUG(Service_FS, "Fixed-key crypto");
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primary_key.fill(0);
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secondary_key.fill(0);
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} else {
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using namespace HW::AES;
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InitKeys();
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std::array<u8, 16> key_y_primary, key_y_secondary;
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std::copy(ncch_header.signature, ncch_header.signature + key_y_primary.size(),
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key_y_primary.begin());
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if (!ncch_header.seed_crypto) {
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key_y_secondary = key_y_primary;
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} else {
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// Seed crypto is unimplemented.
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LOG_ERROR(Service_FS, "Unsupported seed crypto");
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failed_to_decrypt = true;
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}
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SetKeyY(KeySlotID::NCCHSecure1, key_y_primary);
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if (!IsNormalKeyAvailable(KeySlotID::NCCHSecure1)) {
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LOG_ERROR(Service_FS, "Secure1 KeyX missing");
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failed_to_decrypt = true;
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}
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primary_key = GetNormalKey(KeySlotID::NCCHSecure1);
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switch (ncch_header.secondary_key_slot) {
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case 0:
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LOG_DEBUG(Service_FS, "Secure1 crypto");
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secondary_key = primary_key;
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break;
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case 1:
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LOG_DEBUG(Service_FS, "Secure2 crypto");
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SetKeyY(KeySlotID::NCCHSecure2, key_y_secondary);
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if (!IsNormalKeyAvailable(KeySlotID::NCCHSecure2)) {
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LOG_ERROR(Service_FS, "Secure2 KeyX missing");
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failed_to_decrypt = true;
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}
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secondary_key = GetNormalKey(KeySlotID::NCCHSecure2);
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break;
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case 10:
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LOG_DEBUG(Service_FS, "Secure3 crypto");
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SetKeyY(KeySlotID::NCCHSecure3, key_y_secondary);
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if (!IsNormalKeyAvailable(KeySlotID::NCCHSecure3)) {
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LOG_ERROR(Service_FS, "Secure3 KeyX missing");
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failed_to_decrypt = true;
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}
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secondary_key = GetNormalKey(KeySlotID::NCCHSecure3);
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break;
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case 11:
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LOG_DEBUG(Service_FS, "Secure4 crypto");
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SetKeyY(KeySlotID::NCCHSecure4, key_y_secondary);
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if (!IsNormalKeyAvailable(KeySlotID::NCCHSecure4)) {
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LOG_ERROR(Service_FS, "Secure4 KeyX missing");
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failed_to_decrypt = true;
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}
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secondary_key = GetNormalKey(KeySlotID::NCCHSecure4);
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break;
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}
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}
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// Find CTR for each section
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// Written with reference to
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// https://github.com/d0k3/GodMode9/blob/99af6a73be48fa7872649aaa7456136da0df7938/arm9/source/game/ncch.c#L34-L52
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if (ncch_header.version == 0 || ncch_header.version == 2) {
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LOG_DEBUG(Loader, "NCCH version 0/2");
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// In this version, CTR for each section is a magic number prefixed by partition ID
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// (reverse order)
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std::reverse_copy(ncch_header.partition_id, ncch_header.partition_id + 8,
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exheader_ctr.begin());
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exefs_ctr = romfs_ctr = exheader_ctr;
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exheader_ctr[8] = 1;
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exefs_ctr[8] = 2;
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romfs_ctr[8] = 3;
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} else if (ncch_header.version == 1) {
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LOG_DEBUG(Loader, "NCCH version 1");
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// In this version, CTR for each section is the section offset prefixed by partition
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// ID, as if the entire NCCH image is encrypted using a single CTR stream.
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std::copy(ncch_header.partition_id, ncch_header.partition_id + 8,
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exheader_ctr.begin());
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exefs_ctr = romfs_ctr = exheader_ctr;
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auto u32ToBEArray = [](u32 value) -> std::array<u8, 4> {
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return std::array<u8, 4>{
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static_cast<u8>(value >> 24),
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static_cast<u8>((value >> 16) & 0xFF),
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static_cast<u8>((value >> 8) & 0xFF),
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static_cast<u8>(value & 0xFF),
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};
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};
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auto offset_exheader = u32ToBEArray(0x200); // exheader offset
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auto offset_exefs = u32ToBEArray(ncch_header.exefs_offset * kBlockSize);
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auto offset_romfs = u32ToBEArray(ncch_header.romfs_offset * kBlockSize);
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std::copy(offset_exheader.begin(), offset_exheader.end(),
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exheader_ctr.begin() + 12);
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std::copy(offset_exefs.begin(), offset_exefs.end(), exefs_ctr.begin() + 12);
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std::copy(offset_romfs.begin(), offset_romfs.end(), romfs_ctr.begin() + 12);
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} else {
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LOG_ERROR(Service_FS, "Unknown NCCH version {}", ncch_header.version);
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failed_to_decrypt = true;
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}
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} else {
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LOG_DEBUG(Service_FS, "No crypto");
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is_encrypted = false;
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}
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// System archives and DLC don't have an extended header but have RomFS
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if (ncch_header.extended_header_size) {
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if (file.ReadBytes(&exheader_header, sizeof(ExHeader_Header)) !=
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sizeof(ExHeader_Header))
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return Loader::ResultStatus::Error;
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if (is_encrypted) {
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// This ID check is masked to low 32-bit as a toleration to ill-formed ROM created
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// by merging games and its updates.
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if ((exheader_header.system_info.jump_id & 0xFFFFFFFF) ==
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(ncch_header.program_id & 0xFFFFFFFF)) {
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LOG_WARNING(Service_FS, "NCCH is marked as encrypted but with decrypted "
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"exheader. Force no crypto scheme.");
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is_encrypted = false;
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} else {
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if (failed_to_decrypt) {
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LOG_ERROR(Service_FS, "Failed to decrypt");
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return Loader::ResultStatus::ErrorEncrypted;
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}
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CryptoPP::byte* data = reinterpret_cast<CryptoPP::byte*>(&exheader_header);
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CryptoPP::CTR_Mode<CryptoPP::AES>::Decryption(
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primary_key.data(), primary_key.size(), exheader_ctr.data())
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.ProcessData(data, data, sizeof(exheader_header));
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}
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}
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is_compressed = (exheader_header.codeset_info.flags.flag & 1) == 1;
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u32 entry_point = exheader_header.codeset_info.text.address;
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u32 code_size = exheader_header.codeset_info.text.code_size;
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u32 stack_size = exheader_header.codeset_info.stack_size;
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u32 bss_size = exheader_header.codeset_info.bss_size;
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u32 core_version = exheader_header.arm11_system_local_caps.core_version;
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u8 priority = exheader_header.arm11_system_local_caps.priority;
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u8 resource_limit_category =
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exheader_header.arm11_system_local_caps.resource_limit_category;
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LOG_DEBUG(Service_FS, "Name: {}",
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exheader_header.codeset_info.name);
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LOG_DEBUG(Service_FS, "Program ID: {:016X}", ncch_header.program_id);
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LOG_DEBUG(Service_FS, "Code compressed: {}", is_compressed ? "yes" : "no");
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LOG_DEBUG(Service_FS, "Entry point: 0x{:08X}", entry_point);
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LOG_DEBUG(Service_FS, "Code size: 0x{:08X}", code_size);
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LOG_DEBUG(Service_FS, "Stack size: 0x{:08X}", stack_size);
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LOG_DEBUG(Service_FS, "Bss size: 0x{:08X}", bss_size);
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LOG_DEBUG(Service_FS, "Core version: {}", core_version);
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LOG_DEBUG(Service_FS, "Thread priority: 0x{:X}", priority);
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LOG_DEBUG(Service_FS, "Resource limit category: {}", resource_limit_category);
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LOG_DEBUG(Service_FS, "System Mode: {}",
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static_cast<int>(exheader_header.arm11_system_local_caps.system_mode));
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has_exheader = true;
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}
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// DLC can have an ExeFS and a RomFS but no extended header
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if (ncch_header.exefs_size) {
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exefs_offset = ncch_header.exefs_offset * kBlockSize;
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u32 exefs_size = ncch_header.exefs_size * kBlockSize;
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LOG_DEBUG(Service_FS, "ExeFS offset: 0x{:08X}", exefs_offset);
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LOG_DEBUG(Service_FS, "ExeFS size: 0x{:08X}", exefs_size);
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file.Seek(exefs_offset + ncch_offset, SEEK_SET);
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if (file.ReadBytes(&exefs_header, sizeof(ExeFs_Header)) != sizeof(ExeFs_Header))
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return Loader::ResultStatus::Error;
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if (is_encrypted) {
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CryptoPP::byte* data = reinterpret_cast<CryptoPP::byte*>(&exefs_header);
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CryptoPP::CTR_Mode<CryptoPP::AES>::Decryption(primary_key.data(),
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primary_key.size(), exefs_ctr.data())
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.ProcessData(data, data, sizeof(exefs_header));
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}
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exefs_file = FileUtil::IOFile(filepath, "rb");
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has_exefs = true;
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}
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if (ncch_header.romfs_offset != 0 && ncch_header.romfs_size != 0)
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has_romfs = true;
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}
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LoadOverrides();
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// We need at least one of these or overrides, practically
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if (!(has_exefs || has_romfs || is_tainted))
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return Loader::ResultStatus::Error;
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is_loaded = true;
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return Loader::ResultStatus::Success;
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}
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Loader::ResultStatus NCCHContainer::LoadOverrides() {
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// Check for split-off files, mark the archive as tainted if we will use them
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std::string romfs_override = filepath + ".romfs";
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if (FileUtil::Exists(romfs_override)) {
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is_tainted = true;
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}
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// If we have a split-off exefs file/folder, it takes priority
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std::string exefs_override = filepath + ".exefs";
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std::string exefsdir_override = filepath + ".exefsdir/";
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if (FileUtil::Exists(exefs_override)) {
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exefs_file = FileUtil::IOFile(exefs_override, "rb");
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if (exefs_file.ReadBytes(&exefs_header, sizeof(ExeFs_Header)) == sizeof(ExeFs_Header)) {
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LOG_DEBUG(Service_FS, "Loading ExeFS section from {}", exefs_override);
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exefs_offset = 0;
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is_tainted = true;
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has_exefs = true;
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} else {
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exefs_file = FileUtil::IOFile(filepath, "rb");
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}
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} else if (FileUtil::Exists(exefsdir_override) && FileUtil::IsDirectory(exefsdir_override)) {
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is_tainted = true;
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}
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if (is_tainted)
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LOG_WARNING(Service_FS,
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"Loaded NCCH {} is tainted, application behavior may not be as expected!",
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filepath);
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return Loader::ResultStatus::Success;
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}
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Loader::ResultStatus NCCHContainer::LoadSectionExeFS(const char* name, std::vector<u8>& buffer) {
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Loader::ResultStatus result = Load();
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if (result != Loader::ResultStatus::Success)
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return result;
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// Check if we have files that can drop-in and replace
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result = LoadOverrideExeFSSection(name, buffer);
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if (result == Loader::ResultStatus::Success || !has_exefs)
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return result;
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// As of firmware 5.0.0-11 the logo is stored between the access descriptor and the plain region
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// instead of the ExeFS.
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if (std::strcmp(name, "logo") == 0) {
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if (ncch_header.logo_region_offset && ncch_header.logo_region_size) {
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std::size_t logo_offset = ncch_header.logo_region_offset * kBlockSize;
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std::size_t logo_size = ncch_header.logo_region_size * kBlockSize;
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buffer.resize(logo_size);
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file.Seek(ncch_offset + logo_offset, SEEK_SET);
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if (file.ReadBytes(buffer.data(), logo_size) != logo_size) {
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LOG_ERROR(Service_FS, "Could not read NCCH logo");
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return Loader::ResultStatus::Error;
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}
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return Loader::ResultStatus::Success;
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} else {
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LOG_INFO(Service_FS, "Attempting to load logo from the ExeFS");
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}
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}
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// If we don't have any separate files, we'll need a full ExeFS
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if (!exefs_file.IsOpen())
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return Loader::ResultStatus::Error;
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LOG_DEBUG(Service_FS, "{} sections:", kMaxSections);
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// Iterate through the ExeFs archive until we find a section with the specified name...
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for (unsigned section_number = 0; section_number < kMaxSections; section_number++) {
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const auto& section = exefs_header.section[section_number];
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// Load the specified section...
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if (strcmp(section.name, name) == 0) {
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LOG_DEBUG(Service_FS, "{} - offset: 0x{:08X}, size: 0x{:08X}, name: {}", section_number,
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section.offset, section.size, section.name);
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s64 section_offset =
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(section.offset + exefs_offset + sizeof(ExeFs_Header) + ncch_offset);
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exefs_file.Seek(section_offset, SEEK_SET);
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std::array<u8, 16> key;
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if (strcmp(section.name, "icon") == 0 || strcmp(section.name, "banner") == 0) {
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key = primary_key;
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} else {
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key = secondary_key;
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}
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CryptoPP::CTR_Mode<CryptoPP::AES>::Decryption dec(key.data(), key.size(),
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exefs_ctr.data());
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dec.Seek(section.offset + sizeof(ExeFs_Header));
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if (strcmp(section.name, ".code") == 0 && is_compressed) {
|
|
// Section is compressed, read compressed .code section...
|
|
std::unique_ptr<u8[]> temp_buffer;
|
|
try {
|
|
temp_buffer.reset(new u8[section.size]);
|
|
} catch (std::bad_alloc&) {
|
|
return Loader::ResultStatus::ErrorMemoryAllocationFailed;
|
|
}
|
|
|
|
if (exefs_file.ReadBytes(&temp_buffer[0], section.size) != section.size)
|
|
return Loader::ResultStatus::Error;
|
|
|
|
if (is_encrypted) {
|
|
dec.ProcessData(&temp_buffer[0], &temp_buffer[0], section.size);
|
|
}
|
|
|
|
// Decompress .code section...
|
|
u32 decompressed_size = LZSS_GetDecompressedSize(&temp_buffer[0], section.size);
|
|
buffer.resize(decompressed_size);
|
|
if (!LZSS_Decompress(&temp_buffer[0], section.size, &buffer[0], decompressed_size))
|
|
return Loader::ResultStatus::ErrorInvalidFormat;
|
|
} else {
|
|
// Section is uncompressed...
|
|
buffer.resize(section.size);
|
|
if (exefs_file.ReadBytes(&buffer[0], section.size) != section.size)
|
|
return Loader::ResultStatus::Error;
|
|
if (is_encrypted) {
|
|
dec.ProcessData(&buffer[0], &buffer[0], section.size);
|
|
}
|
|
}
|
|
return Loader::ResultStatus::Success;
|
|
}
|
|
}
|
|
return Loader::ResultStatus::ErrorNotUsed;
|
|
}
|
|
|
|
Loader::ResultStatus NCCHContainer::LoadOverrideExeFSSection(const char* name,
|
|
std::vector<u8>& buffer) {
|
|
std::string override_name;
|
|
|
|
// Map our section name to the extracted equivalent
|
|
if (!strcmp(name, ".code"))
|
|
override_name = "code.bin";
|
|
else if (!strcmp(name, "icon"))
|
|
override_name = "code.bin";
|
|
else if (!strcmp(name, "banner"))
|
|
override_name = "banner.bnr";
|
|
else if (!strcmp(name, "logo"))
|
|
override_name = "logo.bcma.lz";
|
|
else
|
|
return Loader::ResultStatus::Error;
|
|
|
|
std::string section_override = filepath + ".exefsdir/" + override_name;
|
|
FileUtil::IOFile section_file(section_override, "rb");
|
|
|
|
if (section_file.IsOpen()) {
|
|
auto section_size = section_file.GetSize();
|
|
buffer.resize(section_size);
|
|
|
|
section_file.Seek(0, SEEK_SET);
|
|
if (section_file.ReadBytes(&buffer[0], section_size) == section_size) {
|
|
LOG_WARNING(Service_FS, "File {} overriding built-in ExeFS file", section_override);
|
|
return Loader::ResultStatus::Success;
|
|
}
|
|
}
|
|
return Loader::ResultStatus::ErrorNotUsed;
|
|
}
|
|
|
|
Loader::ResultStatus NCCHContainer::ReadRomFS(std::shared_ptr<RomFSReader>& romfs_file) {
|
|
Loader::ResultStatus result = Load();
|
|
if (result != Loader::ResultStatus::Success)
|
|
return result;
|
|
|
|
if (ReadOverrideRomFS(romfs_file) == Loader::ResultStatus::Success)
|
|
return Loader::ResultStatus::Success;
|
|
|
|
if (!has_romfs) {
|
|
LOG_DEBUG(Service_FS, "RomFS requested from NCCH which has no RomFS");
|
|
return Loader::ResultStatus::ErrorNotUsed;
|
|
}
|
|
|
|
if (!file.IsOpen())
|
|
return Loader::ResultStatus::Error;
|
|
|
|
u32 romfs_offset = ncch_offset + (ncch_header.romfs_offset * kBlockSize) + 0x1000;
|
|
u32 romfs_size = (ncch_header.romfs_size * kBlockSize) - 0x1000;
|
|
|
|
LOG_DEBUG(Service_FS, "RomFS offset: 0x{:08X}", romfs_offset);
|
|
LOG_DEBUG(Service_FS, "RomFS size: 0x{:08X}", romfs_size);
|
|
|
|
if (file.GetSize() < romfs_offset + romfs_size)
|
|
return Loader::ResultStatus::Error;
|
|
|
|
// We reopen the file, to allow its position to be independent from file's
|
|
FileUtil::IOFile romfs_file_inner(filepath, "rb");
|
|
if (!romfs_file_inner.IsOpen())
|
|
return Loader::ResultStatus::Error;
|
|
|
|
if (is_encrypted) {
|
|
romfs_file = std::make_shared<RomFSReader>(std::move(romfs_file_inner), romfs_offset,
|
|
romfs_size, secondary_key, romfs_ctr, 0x1000);
|
|
} else {
|
|
romfs_file =
|
|
std::make_shared<RomFSReader>(std::move(romfs_file_inner), romfs_offset, romfs_size);
|
|
}
|
|
|
|
return Loader::ResultStatus::Success;
|
|
}
|
|
|
|
Loader::ResultStatus NCCHContainer::ReadOverrideRomFS(std::shared_ptr<RomFSReader>& romfs_file) {
|
|
// Check for RomFS overrides
|
|
std::string split_filepath = filepath + ".romfs";
|
|
if (FileUtil::Exists(split_filepath)) {
|
|
FileUtil::IOFile romfs_file_inner(split_filepath, "rb");
|
|
if (romfs_file_inner.IsOpen()) {
|
|
LOG_WARNING(Service_FS, "File {} overriding built-in RomFS", split_filepath);
|
|
romfs_file = std::make_shared<RomFSReader>(std::move(romfs_file_inner), 0,
|
|
romfs_file_inner.GetSize());
|
|
return Loader::ResultStatus::Success;
|
|
}
|
|
}
|
|
|
|
return Loader::ResultStatus::ErrorNotUsed;
|
|
}
|
|
|
|
Loader::ResultStatus NCCHContainer::ReadProgramId(u64_le& program_id) {
|
|
Loader::ResultStatus result = Load();
|
|
if (result != Loader::ResultStatus::Success)
|
|
return result;
|
|
|
|
if (!has_header)
|
|
return Loader::ResultStatus::ErrorNotUsed;
|
|
|
|
program_id = ncch_header.program_id;
|
|
return Loader::ResultStatus::Success;
|
|
}
|
|
|
|
bool NCCHContainer::HasExeFS() {
|
|
Loader::ResultStatus result = Load();
|
|
if (result != Loader::ResultStatus::Success)
|
|
return false;
|
|
|
|
return has_exefs;
|
|
}
|
|
|
|
bool NCCHContainer::HasRomFS() {
|
|
Loader::ResultStatus result = Load();
|
|
if (result != Loader::ResultStatus::Success)
|
|
return false;
|
|
|
|
return has_romfs;
|
|
}
|
|
|
|
bool NCCHContainer::HasExHeader() {
|
|
Loader::ResultStatus result = Load();
|
|
if (result != Loader::ResultStatus::Success)
|
|
return false;
|
|
|
|
return has_exheader;
|
|
}
|
|
|
|
} // namespace FileSys
|