107 lines
3.9 KiB
C++
107 lines
3.9 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "grant_store.h"
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#include "blob.h"
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#include <algorithm>
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#include <sstream>
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namespace keystore {
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static constexpr uint64_t kInvalidGrantNo = std::numeric_limits<uint64_t>::max();
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static const char* kKeystoreGrantInfix = "_KEYSTOREGRANT_";
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static constexpr size_t kKeystoreGrantInfixLength = 15;
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Grant::Grant(const KeyBlobEntry& entry, const uint64_t grant_no)
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: entry_(entry), grant_no_(grant_no) {}
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static std::pair<uint64_t, std::string> parseGrantAlias(const std::string& grantAlias) {
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auto pos = grantAlias.rfind(kKeystoreGrantInfix);
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if (pos == std::string::npos) return {kInvalidGrantNo, ""};
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std::stringstream s(grantAlias.substr(pos + kKeystoreGrantInfixLength));
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std::string wrapped_alias = grantAlias.substr(0, pos);
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uint64_t grant_no = kInvalidGrantNo;
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s >> grant_no;
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if (s.fail() || grant_no == kInvalidGrantNo) return {kInvalidGrantNo, ""};
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return {grant_no, wrapped_alias};
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}
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std::string GrantStore::put(const uid_t uid, const LockedKeyBlobEntry& lockedEntry) {
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std::unique_lock<std::shared_mutex> lock(mutex_);
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std::stringstream s;
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KeyBlobEntry blobEntry = *lockedEntry;
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s << blobEntry.alias() << kKeystoreGrantInfix;
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std::set<Grant, std::less<>>& uid_grant_list = grants_[uid];
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bool success = false;
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auto iterator =
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std::find_if(uid_grant_list.begin(), uid_grant_list.end(),
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[&](const Grant& entry) { return success = entry.entry_ == blobEntry; });
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while (!success) {
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std::tie(iterator, success) = uid_grant_list.emplace(blobEntry, std::rand());
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}
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s << iterator->grant_no_;
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return s.str();
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}
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ReadLockedGrant GrantStore::get(const uid_t uid, const std::string& alias) const {
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std::shared_lock<std::shared_mutex> lock(mutex_);
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uint64_t grant_no;
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std::string wrappedAlias;
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std::tie(grant_no, wrappedAlias) = parseGrantAlias(alias);
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if (grant_no == kInvalidGrantNo) return {};
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auto uid_set_iter = grants_.find(uid);
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if (uid_set_iter == grants_.end()) return {};
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auto& uid_grant_list = uid_set_iter->second;
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auto grant = uid_grant_list.find(grant_no);
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if (grant == uid_grant_list.end()) return {};
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if (grant->entry_.alias() != wrappedAlias) return {};
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return {&(*grant), std::move(lock)};
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}
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bool GrantStore::removeByFileAlias(const uid_t granteeUid, const LockedKeyBlobEntry& lockedEntry) {
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std::unique_lock<std::shared_mutex> lock(mutex_);
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auto& uid_grant_list = grants_[granteeUid];
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for (auto i = uid_grant_list.begin(); i != uid_grant_list.end(); ++i) {
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if (i->entry_ == *lockedEntry) {
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uid_grant_list.erase(i);
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return true;
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}
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}
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return false;
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}
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void GrantStore::removeAllGrantsToKey(const uid_t granterUid, const std::string& alias) {
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std::unique_lock<std::shared_mutex> lock(mutex_);
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for (auto& uid_grant_list : grants_) {
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for (auto i = uid_grant_list.second.begin(); i != uid_grant_list.second.end(); ++i) {
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if (i->entry_.alias() == alias && i->entry_.uid() == granterUid) {
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uid_grant_list.second.erase(i);
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break;
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}
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}
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}
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}
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void GrantStore::removeAllGrantsToUid(const uid_t granteeUid) {
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std::unique_lock<std::shared_mutex> lock(mutex_);
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grants_.erase(granteeUid);
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}
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} // namespace keystore
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