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

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/*
* Copyright (c) 2018-2020 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 "ro_nrr_utils.hpp"
#include "ro_service_impl.hpp"
namespace ams::ro::impl {
namespace {
/* Helper functions. */
Result ValidateNrrSignature(const NrrHeader *header) {
/* TODO: Implement RSA-2048 PSS..... */
/* TODO: Check PSS fixed-key signature. */
R_UNLESS(true, ResultNotAuthorized());
/* Check ProgramId pattern is valid. */
R_UNLESS(header->IsProgramIdValid(), ResultNotAuthorized());
/* TODO: Check PSS signature over hashes. */
R_UNLESS(true, ResultNotAuthorized());
return ResultSuccess();
}
Result ValidateNrr(const NrrHeader *header, u64 size, ncm::ProgramId program_id, ModuleType expected_type, bool enforce_type) {
/* Check magic. */
R_UNLESS(header->IsMagicValid(), ResultInvalidNrr());
/* Check size. */
R_UNLESS(header->GetSize() == size, ResultInvalidSize());
/* Only perform checks if we must. */
const bool ease_nro_restriction = ShouldEaseNroRestriction();
if (!ease_nro_restriction) {
/* Check signature. */
R_TRY(ValidateNrrSignature(header));
/* Check program id. */
R_UNLESS(header->GetProgramId() == program_id, ResultInvalidNrr());
/* Check type. */
if (hos::GetVersion() >= hos::Version_700 && enforce_type) {
R_UNLESS(header->GetType() == expected_type, ResultInvalidNrrType());
}
}
return ResultSuccess();
}
}
/* Utilities for working with NRRs. */
Result MapAndValidateNrr(NrrHeader **out_header, u64 *out_mapped_code_address, Handle process_handle, ncm::ProgramId program_id, u64 nrr_heap_address, u64 nrr_heap_size, ModuleType expected_type, bool enforce_type) {
map::MappedCodeMemory nrr_mcm(ResultInternalError{});
/* 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;
R_UNLESS(R_SUCCEEDED(map::LocateMappableSpace(&map_address, nrr_heap_size)), ResultOutOfAddressSpace());
/* 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);
R_TRY(nrr_map.GetResult());
NrrHeader *nrr_header = reinterpret_cast<NrrHeader *>(map_address);
R_TRY(ValidateNrr(nrr_header, nrr_heap_size, program_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();
}
}