ro: refactor/rewrite into sts:: namespace

stratosphere/ro/source/impl/ro_nrr_utils.cpp

@@ -0,0 +1,120 @@
+/*
+ * 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;
+    }
+
+}