mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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120 lines
4.3 KiB
C++
120 lines
4.3 KiB
C++
/*
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* Copyright (c) 2018-2019 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 <stratosphere/map.hpp>
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#include "ro_nrr_utils.hpp"
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#include "ro_service_impl.hpp"
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namespace sts::ro::impl {
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namespace {
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/* Helper functions. */
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Result ValidateNrrSignature(const NrrHeader *header) {
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/* TODO: Implement RSA-2048 PSS..... */
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/* TODO: Check PSS fixed-key signature. */
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if (false) {
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return ResultRoNotAuthorized;
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}
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/* Check TitleID pattern is valid. */
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if (!header->IsTitleIdValid()) {
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return ResultRoNotAuthorized;
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}
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/* TODO: Check PSS signature over hashes. */
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if (false) {
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return ResultRoNotAuthorized;
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}
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return ResultSuccess;
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}
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Result ValidateNrr(const NrrHeader *header, u64 size, u64 title_id, ModuleType expected_type, bool enforce_type) {
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/* Check magic. */
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if (!header->IsMagicValid()) {
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return ResultRoInvalidNrr;
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}
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/* Check size. */
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if (header->GetSize() != size) {
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return ResultRoInvalidSize;
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}
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/* Only perform checks if we must. */
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const bool ease_nro_restriction = ShouldEaseNroRestriction();
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if (!ease_nro_restriction) {
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/* Check signature. */
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R_TRY(ValidateNrrSignature(header));
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/* Check title id. */
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if (title_id != header->GetTitleId()) {
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return ResultRoInvalidNrr;
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}
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/* Check type. */
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if (GetRuntimeFirmwareVersion() >= FirmwareVersion_700 && enforce_type) {
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if (expected_type != header->GetType()) {
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return ResultRoInvalidNrrType;
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}
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}
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}
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return ResultSuccess;
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}
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}
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/* Utilities for working with NRRs. */
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Result MapAndValidateNrr(NrrHeader **out_header, u64 *out_mapped_code_address, Handle process_handle, u64 title_id, u64 nrr_heap_address, u64 nrr_heap_size, ModuleType expected_type, bool enforce_type) {
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map::MappedCodeMemory nrr_mcm(ResultRoInternalError);
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/* First, map the NRR. */
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R_TRY(map::MapCodeMemoryInProcess(nrr_mcm, process_handle, nrr_heap_address, nrr_heap_size));
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const u64 code_address = nrr_mcm.GetDstAddress();
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uintptr_t map_address;
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if (R_FAILED(map::LocateMappableSpace(&map_address, nrr_heap_size))) {
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return ResultRoInsufficientAddressSpace;
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}
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/* Nintendo...does not check the return value of this map. We will check, instead of aborting if it fails. */
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map::AutoCloseMap nrr_map(map_address, process_handle, code_address, nrr_heap_size);
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if (!nrr_map.IsSuccess()) {
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return nrr_map.GetResult();
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}
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NrrHeader *nrr_header = reinterpret_cast<NrrHeader *>(map_address);
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R_TRY(ValidateNrr(nrr_header, nrr_heap_size, title_id, expected_type, enforce_type));
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/* Invalidation here actually prevents them from unmapping at scope exit. */
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nrr_map.Invalidate();
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nrr_mcm.Invalidate();
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*out_header = nrr_header;
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*out_mapped_code_address = code_address;
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return ResultSuccess;
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}
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Result UnmapNrr(Handle process_handle, const NrrHeader *header, u64 nrr_heap_address, u64 nrr_heap_size, u64 mapped_code_address) {
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R_TRY(svcUnmapProcessMemory(reinterpret_cast<void *>(const_cast<NrrHeader *>(header)), process_handle, mapped_code_address, nrr_heap_size));
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R_TRY(svcUnmapProcessCodeMemory(process_handle, mapped_code_address, nrr_heap_address, nrr_heap_size));
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return ResultSuccess;
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}
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}
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