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