mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-12-05 07:49:09 +00:00
81f91803ec
* fs: implement support for interacting with ncas. * spl: extend to use virtual keyslots
133 lines
5.4 KiB
C++
133 lines
5.4 KiB
C++
/*
|
|
* 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/>.
|
|
*/
|
|
#pragma once
|
|
#include <stratosphere.hpp>
|
|
|
|
namespace ams::fssystem {
|
|
|
|
class KeySlotCacheAccessor : public ::ams::fs::impl::Newable {
|
|
NON_COPYABLE(KeySlotCacheAccessor);
|
|
NON_MOVEABLE(KeySlotCacheAccessor);
|
|
private:
|
|
std::unique_lock<os::Mutex> lk;
|
|
const s32 slot_index;
|
|
public:
|
|
KeySlotCacheAccessor(s32 idx, std::unique_lock<os::Mutex> &&l) : lk(std::move(l)), slot_index(idx) { /* ... */ }
|
|
|
|
s32 GetKeySlotIndex() const { return this->slot_index; }
|
|
};
|
|
|
|
class KeySlotCacheEntry : public util::IntrusiveListBaseNode<KeySlotCacheEntry> {
|
|
NON_COPYABLE(KeySlotCacheEntry);
|
|
NON_MOVEABLE(KeySlotCacheEntry);
|
|
public:
|
|
static constexpr size_t KeySize = crypto::AesDecryptor128::KeySize;
|
|
private:
|
|
const s32 slot_index;
|
|
u8 key1[KeySize];
|
|
s32 key2;
|
|
public:
|
|
explicit KeySlotCacheEntry(s32 idx) : slot_index(idx), key2(-1) {
|
|
std::memset(this->key1, 0, sizeof(this->key1));
|
|
}
|
|
|
|
bool Contains(const void *key, size_t key_size, s32 key2) const {
|
|
AMS_ASSERT(key_size == KeySize);
|
|
return key2 == this->key2 && std::memcmp(this->key1, key, KeySize) == 0;
|
|
}
|
|
|
|
s32 GetKeySlotIndex() const { return this->slot_index; }
|
|
|
|
void SetKey(const void *key, size_t key_size, s32 key2) {
|
|
AMS_ASSERT(key_size == KeySize);
|
|
std::memcpy(this->key1, key, key_size);
|
|
this->key2 = key2;
|
|
}
|
|
};
|
|
|
|
class KeySlotCache {
|
|
NON_COPYABLE(KeySlotCache);
|
|
NON_MOVEABLE(KeySlotCache);
|
|
private:
|
|
using KeySlotCacheEntryList = util::IntrusiveListBaseTraits<KeySlotCacheEntry>::ListType;
|
|
private:
|
|
os::Mutex mutex;
|
|
KeySlotCacheEntryList high_priority_mru_list;
|
|
KeySlotCacheEntryList low_priority_mru_list;
|
|
public:
|
|
constexpr KeySlotCache() : mutex(false), high_priority_mru_list(), low_priority_mru_list() { /* ... */ }
|
|
|
|
Result AllocateHighPriority(std::unique_ptr<KeySlotCacheAccessor> *out, const void *key, size_t key_size, s32 key2) {
|
|
return this->AllocateFromLru(out, this->high_priority_mru_list, key, key_size, key2);
|
|
}
|
|
|
|
Result AllocateLowPriority(std::unique_ptr<KeySlotCacheAccessor> *out, const void *key, size_t key_size, s32 key2) {
|
|
return this->AllocateFromLru(out, this->high_priority_mru_list, key, key_size, key2);
|
|
}
|
|
|
|
Result Find(std::unique_ptr<KeySlotCacheAccessor> *out, const void *key, size_t key_size, s32 key2) {
|
|
std::unique_lock lk(this->mutex);
|
|
|
|
KeySlotCacheEntryList *lists[2] = { std::addressof(this->high_priority_mru_list), std::addressof(this->low_priority_mru_list) };
|
|
for (auto list : lists) {
|
|
for (auto it = list->begin(); it != list->end(); ++it) {
|
|
if (it->Contains(key, key_size, key2)) {
|
|
std::unique_ptr accessor = std::make_unique<KeySlotCacheAccessor>(it->GetKeySlotIndex(), std::move(lk));
|
|
R_UNLESS(accessor != nullptr, fs::ResultAllocationFailure());
|
|
|
|
*out = std::move(accessor);
|
|
|
|
this->UpdateMru(list, it);
|
|
return ResultSuccess();
|
|
}
|
|
}
|
|
}
|
|
|
|
return fs::ResultTargetNotFound();
|
|
}
|
|
|
|
void AddEntry(KeySlotCacheEntry *entry) {
|
|
std::unique_lock lk(this->mutex);
|
|
this->low_priority_mru_list.push_front(*entry);
|
|
}
|
|
private:
|
|
Result AllocateFromLru(std::unique_ptr<KeySlotCacheAccessor> *out, KeySlotCacheEntryList &dst_list, const void *key, size_t key_size, s32 key2) {
|
|
std::unique_lock lk(this->mutex);
|
|
|
|
KeySlotCacheEntryList &src_list = this->low_priority_mru_list.empty() ? this->high_priority_mru_list : this->low_priority_mru_list;
|
|
AMS_ASSERT(!src_list.empty());
|
|
|
|
auto it = src_list.rbegin();
|
|
std::unique_ptr accessor = std::make_unique<KeySlotCacheAccessor>(it->GetKeySlotIndex(), std::move(lk));
|
|
*out = std::move(accessor);
|
|
|
|
it->SetKey(key, key_size, key2);
|
|
|
|
auto *entry = std::addressof(*it);
|
|
src_list.pop_back();
|
|
dst_list.push_front(*entry);
|
|
|
|
return ResultSuccess();
|
|
}
|
|
|
|
void UpdateMru(KeySlotCacheEntryList *list, KeySlotCacheEntryList::iterator it) {
|
|
auto *entry = std::addressof(*it);
|
|
list->erase(it);
|
|
list->push_front(*entry);
|
|
}
|
|
};
|
|
|
|
}
|