Atmosphere/stratosphere/ro/source/impl/ro_nrr_utils.cpp

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/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stratosphere/map.hpp>
#include "ro_nrr_utils.hpp"
#include "ro_service_impl.hpp"
namespace sts::ro::impl {
namespace {
/* Helper functions. */
Result ValidateNrrSignature(const NrrHeader *header) {
/* TODO: Implement RSA-2048 PSS..... */
/* TODO: Check PSS fixed-key signature. */
if (false) {
return ResultRoNotAuthorized;
}
/* Check TitleID pattern is valid. */
if (!header->IsTitleIdValid()) {
return ResultRoNotAuthorized;
}
/* TODO: Check PSS signature over hashes. */
if (false) {
return ResultRoNotAuthorized;
}
return ResultSuccess;
}
Result ValidateNrr(const NrrHeader *header, u64 size, u64 title_id, ModuleType expected_type, bool enforce_type) {
/* Check magic. */
if (!header->IsMagicValid()) {
return ResultRoInvalidNrr;
}
/* Check size. */
if (header->GetSize() != size) {
return ResultRoInvalidSize;
}
/* Only perform checks if we must. */
const bool ease_nro_restriction = ShouldEaseNroRestriction();
if (!ease_nro_restriction) {
/* Check signature. */
R_TRY(ValidateNrrSignature(header));
/* Check title id. */
if (title_id != header->GetTitleId()) {
return ResultRoInvalidNrr;
}
/* Check type. */
if (GetRuntimeFirmwareVersion() >= FirmwareVersion_700 && enforce_type) {
if (expected_type != header->GetType()) {
return ResultRoInvalidNrrType;
}
}
}
return ResultSuccess;
}
}
/* Utilities for working with NRRs. */
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) {
map::MappedCodeMemory nrr_mcm(ResultRoInternalError);
/* First, map the NRR. */
R_TRY(map::MapCodeMemoryInProcess(nrr_mcm, process_handle, nrr_heap_address, nrr_heap_size));
const u64 code_address = nrr_mcm.GetDstAddress();
uintptr_t map_address;
if (R_FAILED(map::LocateMappableSpace(&map_address, nrr_heap_size))) {
return ResultRoInsufficientAddressSpace;
}
/* Nintendo...does not check the return value of this map. We will check, instead of aborting if it fails. */
map::AutoCloseMap nrr_map(map_address, process_handle, code_address, nrr_heap_size);
if (!nrr_map.IsSuccess()) {
return nrr_map.GetResult();
}
NrrHeader *nrr_header = reinterpret_cast<NrrHeader *>(map_address);
R_TRY(ValidateNrr(nrr_header, nrr_heap_size, title_id, expected_type, enforce_type));
/* Invalidation here actually prevents them from unmapping at scope exit. */
nrr_map.Invalidate();
nrr_mcm.Invalidate();
*out_header = nrr_header;
*out_mapped_code_address = code_address;
return ResultSuccess;
}
Result UnmapNrr(Handle process_handle, const NrrHeader *header, u64 nrr_heap_address, u64 nrr_heap_size, u64 mapped_code_address) {
R_TRY(svcUnmapProcessMemory(reinterpret_cast<void *>(const_cast<NrrHeader *>(header)), process_handle, mapped_code_address, nrr_heap_size));
R_TRY(svcUnmapProcessCodeMemory(process_handle, mapped_code_address, nrr_heap_address, nrr_heap_size));
return ResultSuccess;
}
}