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https://github.com/Atmosphere-NX/Atmosphere.git
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255 lines
11 KiB
C++
255 lines
11 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ldr_capabilities.hpp"
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#include "ldr_content_management.hpp"
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#include "ldr_development_manager.hpp"
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#include "ldr_meta.hpp"
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namespace ams::ldr {
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namespace {
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/* Convenience definitions. */
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constexpr size_t MetaCacheBufferSize = 0x8000;
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constexpr inline const char AtmosphereMetaPath[] = ENCODE_ATMOSPHERE_CODE_PATH("/main.npdm");
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constexpr inline const char SdOrBaseMetaPath[] = ENCODE_SD_OR_CODE_PATH("/main.npdm");
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constexpr inline const char BaseMetaPath[] = ENCODE_CODE_PATH("/main.npdm");
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/* Types. */
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struct MetaCache {
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Meta meta;
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u8 buffer[MetaCacheBufferSize];
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};
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/* Global storage. */
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ncm::ProgramId g_cached_program_id;
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cfg::OverrideStatus g_cached_override_status;
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MetaCache g_meta_cache;
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MetaCache g_original_meta_cache;
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/* Helpers. */
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Result ValidateSubregion(size_t allowed_start, size_t allowed_end, size_t start, size_t size, size_t min_size = 0) {
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R_UNLESS(size >= min_size, ResultInvalidMeta());
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R_UNLESS(allowed_start <= start, ResultInvalidMeta());
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R_UNLESS(start <= allowed_end, ResultInvalidMeta());
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R_UNLESS(start + size <= allowed_end, ResultInvalidMeta());
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return ResultSuccess();
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}
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Result ValidateNpdm(const Npdm *npdm, size_t size) {
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/* Validate magic. */
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R_UNLESS(npdm->magic == Npdm::Magic, ResultInvalidMeta());
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/* Validate flags. */
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u32 mask = ~0x1F;
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if (hos::GetVersion() < hos::Version_7_0_0) {
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/* 7.0.0 added 0x10 as a valid bit to NPDM flags, so before that we only check 0xF. */
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mask = ~0xF;
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}
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R_UNLESS(!(npdm->flags & mask), ResultInvalidMeta());
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/* Validate Acid extents. */
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R_TRY(ValidateSubregion(sizeof(Npdm), size, npdm->acid_offset, npdm->acid_size, sizeof(Acid)));
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/* Validate Aci extends. */
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R_TRY(ValidateSubregion(sizeof(Npdm), size, npdm->aci_offset, npdm->aci_size, sizeof(Aci)));
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return ResultSuccess();
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}
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Result ValidateAcid(const Acid *acid, size_t size) {
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/* Validate magic. */
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R_UNLESS(acid->magic == Acid::Magic, ResultInvalidMeta());
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/* Validate that the acid is for production if not development. */
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if (!IsDevelopmentForAcidProductionCheck()) {
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R_UNLESS((acid->flags & Acid::AcidFlag_Production) != 0, ResultInvalidMeta());
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}
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/* Validate Fac, Sac, Kac. */
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R_TRY(ValidateSubregion(sizeof(Acid), size, acid->fac_offset, acid->fac_size));
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R_TRY(ValidateSubregion(sizeof(Acid), size, acid->sac_offset, acid->sac_size));
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R_TRY(ValidateSubregion(sizeof(Acid), size, acid->kac_offset, acid->kac_size));
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return ResultSuccess();
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}
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Result ValidateAci(const Aci *aci, size_t size) {
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/* Validate magic. */
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R_UNLESS(aci->magic == Aci::Magic, ResultInvalidMeta());
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/* Validate Fah, Sac, Kac. */
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R_TRY(ValidateSubregion(sizeof(Aci), size, aci->fah_offset, aci->fah_size));
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R_TRY(ValidateSubregion(sizeof(Aci), size, aci->sac_offset, aci->sac_size));
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R_TRY(ValidateSubregion(sizeof(Aci), size, aci->kac_offset, aci->kac_size));
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return ResultSuccess();
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}
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const u8 *GetAcidSignatureModulus(u32 key_generation) {
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AMS_ASSERT(key_generation <= fssystem::AcidSignatureKeyGenerationMax);
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const u32 used_keygen = (key_generation % (fssystem::AcidSignatureKeyGenerationMax + 1));
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if (IsDevelopmentForAcidSignatureCheck()) {
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return fssystem::AcidSignatureKeyModulusDev[used_keygen];
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} else {
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return fssystem::AcidSignatureKeyModulusProd[used_keygen];
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}
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}
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Result ValidateAcidSignature(Meta *meta) {
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/* Loader did not check signatures prior to 10.0.0. */
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if (hos::GetVersion() < hos::Version_10_0_0) {
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meta->is_signed = false;
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return ResultSuccess();
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}
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/* Verify the signature. */
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const u8 *sig = meta->acid->signature;
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const size_t sig_size = sizeof(meta->acid->signature);
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const u8 *mod = GetAcidSignatureModulus(meta->npdm->signature_key_generation);
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const size_t mod_size = fssystem::AcidSignatureKeyModulusSize;
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const u8 *exp = fssystem::AcidSignatureKeyExponent;
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const size_t exp_size = fssystem::AcidSignatureKeyExponentSize;
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const u8 *msg = meta->acid->modulus;
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const size_t msg_size = meta->acid->size;
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const bool is_signature_valid = crypto::VerifyRsa2048PssSha256(sig, sig_size, mod, mod_size, exp, exp_size, msg, msg_size);
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R_UNLESS(is_signature_valid || !IsEnabledProgramVerification(), ResultInvalidAcidSignature());
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meta->is_signed = is_signature_valid;
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return ResultSuccess();
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}
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Result LoadMetaFromFile(fs::FileHandle file, MetaCache *cache) {
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/* Reset cache. */
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cache->meta = {};
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/* Read from file. */
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s64 npdm_size = 0;
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{
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/* Get file size. */
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R_TRY(fs::GetFileSize(std::addressof(npdm_size), file));
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/* Read data into cache buffer. */
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R_UNLESS(npdm_size <= static_cast<s64>(MetaCacheBufferSize), ResultTooLargeMeta());
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R_TRY(fs::ReadFile(file, 0, cache->buffer, npdm_size));
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}
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/* Ensure size is big enough. */
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R_UNLESS(npdm_size >= static_cast<s64>(sizeof(Npdm)), ResultInvalidMeta());
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/* Validate the meta. */
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{
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Meta *meta = &cache->meta;
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Npdm *npdm = reinterpret_cast<Npdm *>(cache->buffer);
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R_TRY(ValidateNpdm(npdm, npdm_size));
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Acid *acid = reinterpret_cast<Acid *>(cache->buffer + npdm->acid_offset);
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Aci *aci = reinterpret_cast<Aci *>(cache->buffer + npdm->aci_offset);
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R_TRY(ValidateAcid(acid, npdm->acid_size));
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R_TRY(ValidateAci(aci, npdm->aci_size));
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/* Set Meta members. */
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meta->npdm = npdm;
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meta->acid = acid;
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meta->aci = aci;
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meta->acid_fac = reinterpret_cast<u8 *>(acid) + acid->fac_offset;
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meta->acid_sac = reinterpret_cast<u8 *>(acid) + acid->sac_offset;
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meta->acid_kac = reinterpret_cast<u8 *>(acid) + acid->kac_offset;
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meta->aci_fah = reinterpret_cast<u8 *>(aci) + aci->fah_offset;
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meta->aci_sac = reinterpret_cast<u8 *>(aci) + aci->sac_offset;
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meta->aci_kac = reinterpret_cast<u8 *>(aci) + aci->kac_offset;
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meta->modulus = acid->modulus;
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}
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return ResultSuccess();
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}
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}
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/* API. */
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Result LoadMeta(Meta *out_meta, const ncm::ProgramLocation &loc, const cfg::OverrideStatus &status) {
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/* Try to load meta from file. */
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fs::FileHandle file;
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R_TRY(fs::OpenFile(std::addressof(file), AtmosphereMetaPath, fs::OpenMode_Read));
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{
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ON_SCOPE_EXIT { fs::CloseFile(file); };
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R_TRY(LoadMetaFromFile(file, &g_meta_cache));
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}
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/* Patch meta. Start by setting all program ids to the current program id. */
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Meta *meta = &g_meta_cache.meta;
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meta->acid->program_id_min = loc.program_id;
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meta->acid->program_id_max = loc.program_id;
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meta->aci->program_id = loc.program_id;
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/* For HBL, we need to copy some information from the base meta. */
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if (status.IsHbl()) {
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if (R_SUCCEEDED(fs::OpenFile(std::addressof(file), SdOrBaseMetaPath, fs::OpenMode_Read))) {
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ON_SCOPE_EXIT { fs::CloseFile(file); };
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if (R_SUCCEEDED(LoadMetaFromFile(file, &g_original_meta_cache))) {
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Meta *o_meta = &g_original_meta_cache.meta;
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/* Fix pool partition. */
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if (hos::GetVersion() >= hos::Version_5_0_0) {
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meta->acid->flags = (meta->acid->flags & 0xFFFFFFC3) | (o_meta->acid->flags & 0x0000003C);
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}
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/* Fix flags. */
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const u16 program_info_flags = caps::GetProgramInfoFlags(o_meta->aci_kac, o_meta->aci->kac_size);
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caps::SetProgramInfoFlags(program_info_flags, meta->acid_kac, meta->acid->kac_size);
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caps::SetProgramInfoFlags(program_info_flags, meta->aci_kac, meta->aci->kac_size);
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}
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}
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} else if (hos::GetVersion() >= hos::Version_10_0_0) {
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/* If storage id is none, there is no base code filesystem, and thus it is impossible for us to validate. */
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/* However, if we're an application, we are guaranteed a base code filesystem. */
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if (static_cast<ncm::StorageId>(loc.storage_id) != ncm::StorageId::None || ncm::IsApplicationId(loc.program_id)) {
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R_TRY(fs::OpenFile(std::addressof(file), BaseMetaPath, fs::OpenMode_Read));
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ON_SCOPE_EXIT { fs::CloseFile(file); };
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R_TRY(LoadMetaFromFile(file, &g_original_meta_cache));
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R_TRY(ValidateAcidSignature(&g_original_meta_cache.meta));
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meta->modulus = g_original_meta_cache.meta.modulus;
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meta->is_signed = g_original_meta_cache.meta.is_signed;
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}
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}
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/* Set output. */
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g_cached_program_id = loc.program_id;
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g_cached_override_status = status;
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*out_meta = *meta;
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return ResultSuccess();
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}
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Result LoadMetaFromCache(Meta *out_meta, const ncm::ProgramLocation &loc, const cfg::OverrideStatus &status) {
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if (g_cached_program_id != loc.program_id || g_cached_override_status != status) {
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return LoadMeta(out_meta, loc, status);
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}
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*out_meta = g_meta_cache.meta;
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return ResultSuccess();
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}
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void InvalidateMetaCache() {
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/* Set the cached program id back to zero. */
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g_cached_program_id = {};
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}
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}
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