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/*
* Copyright (C) 2019 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 "selabel.h"
#include <selinux/android.h>
namespace android {
namespace init {
namespace {
selabel_handle* sehandle = nullptr;
}
// selinux_android_file_context_handle() takes on the order of 10+ms to run, so we want to cache
// its value. selinux_android_restorecon() also needs an sehandle for file context look up. It
// will create and store its own copy, but selinux_android_set_sehandle() can be used to provide
// one, thus eliminating an extra call to selinux_android_file_context_handle().
void SelabelInitialize() {
sehandle = selinux_android_file_context_handle();
selinux_android_set_sehandle(sehandle);
}
// A C++ wrapper around selabel_lookup() using the cached sehandle.
// If sehandle is null, this returns success with an empty context.
bool SelabelLookupFileContext(const std::string& key, int type, std::string* result) {
result->clear();
if (!sehandle) return true;
char* context;
if (selabel_lookup(sehandle, &context, key.c_str(), type) != 0) {
return false;
}
*result = context;
free(context);
return true;
}
// A C++ wrapper around selabel_lookup_best_match() using the cached sehandle.
// If sehandle is null, this returns success with an empty context.
bool SelabelLookupFileContextBestMatch(const std::string& key,
const std::vector<std::string>& aliases, int type,
std::string* result) {
result->clear();
if (!sehandle) return true;
std::vector<const char*> c_aliases;
for (const auto& alias : aliases) {
c_aliases.emplace_back(alias.c_str());
}
c_aliases.emplace_back(nullptr);
char* context;
if (selabel_lookup_best_match(sehandle, &context, key.c_str(), &c_aliases[0], type) != 0) {
return false;
}
*result = context;
free(context);
return true;
}
} // namespace init
} // namespace android
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