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