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/*
* Copyright (c) 2016-2020 Samsung Electronics Co., Ltd. All rights reserved.
*
* This file is licensed under the terms of MIT License or the Apache License
* Version 2.0 of your choice. See the LICENSE.MIT file for MIT license details.
* See the LICENSE file or the notice below for Apache License Version 2.0
* details.
*
* 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.
*/
/*
* @file permissible-set.cpp
* @author Rafal Krypa <r.krypa@samsung.com>
* @author Radoslaw Bartosiak <r.bartosiak@samsung.com>
* @version 1.0
* @brief Implementation of API for adding, deleting and reading permissible names
* @brief (names of installed applications)
*/
#ifndef _GNU_SOURCE //for TEMP_FAILURE_RETRY
#define _GNU_SOURCE
#endif
#include <cstdio>
#include <cstring>
#include <fstream>
#include <linux/xattr.h>
#include <memory>
#include <pwd.h>
#include <string>
#include <sys/file.h>
#include <sys/smack.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <config.h>
#include <dpl/errno_string.h>
#include <dpl/exception.h>
#include <dpl/fstream_accessors.h>
#include <dpl/log/log.h>
#include <filesystem.h>
#include <permissible-set.h>
#include <privilege_db.h>
#include <security-manager-types.h>
#include <smack-labels.h>
#include <tzplatform_config.h>
#include "tzplatform-config.h"
namespace SecurityManager {
namespace PermissibleSet {
template <typename T>
static inline int getFd(T &fstream)
{
return DPL::FstreamAccessors<T>::GetFd(fstream);
}
template <typename T>
static void openAndLockNameFile(const std::string &nameFile, T &fstream)
{
fstream.open(nameFile);
if (!fstream.is_open()) {
LogError("Unable to open file" << nameFile << ": " << GetErrnoString(errno));
ThrowMsg(PermissibleSetException::FileOpenError, "Unable to open file ");
}
int ret = TEMP_FAILURE_RETRY(flock(getFd(fstream), LOCK_EX));
if (ret == -1) {
LogError("Unable to lock file " << nameFile << ": " << GetErrnoString(errno));
ThrowMsg(PermissibleSetException::FileLockError, "Unable to lock file");
}
}
std::string getPerrmissibleFileLocation(uid_t uid, int installationType)
{
TizenPlatformConfig tpc(uid);
if ((installationType == SM_APP_INSTALL_GLOBAL)
|| (installationType == SM_APP_INSTALL_PRELOADED))
return tpc.ctxMakePath(TZ_SYS_VAR, Config::SERVICE_NAME,
Config::APPS_LABELS_FILE);
else
return tpc.ctxMakePath(TZ_SYS_VAR, Config::SERVICE_NAME,
tpc.ctxGetEnv(TZ_USER_NAME), Config::APPS_LABELS_FILE);
}
static void markPermissibleFileValid(int fd, const std::string &nameFile, bool valid)
{
int ret;
if (valid)
ret = TEMP_FAILURE_RETRY(fchmod(fd, 00444));
else
ret = TEMP_FAILURE_RETRY(fchmod(fd, 00000));
if (ret == -1) {
LogError("Error at fchmod " << nameFile << ": " << GetErrnoString(errno));
ThrowMsg(PermissibleSetException::FileWriteError, "Error at fchmod");
}
}
void updatePermissibleFile(uid_t uid, int installationType,
const std::vector<std::string> &labelsForUser)
{
std::string nameFile = getPerrmissibleFileLocation(uid, installationType);
std::ofstream fstream;
openAndLockNameFile(nameFile, fstream);
markPermissibleFileValid(getFd(fstream), nameFile, false);
for (auto &label : labelsForUser) {
fstream << label << '\n';
if (fstream.bad()) {
LogError("Unable to write to file " << nameFile << ": " << GetErrnoString(errno));
ThrowMsg(PermissibleSetException::PermissibleSetException::FileWriteError,
"Unable to write to file");
}
}
if (fstream.flush().fail()) {
LogError("Error at fflush " << nameFile << ": " << GetErrnoString(errno));
ThrowMsg(PermissibleSetException::FileWriteError, "Error at fflush");
}
if (fsync(getFd(fstream)) == -1) {
LogError("Error at fsync " << nameFile << ": " << GetErrnoString(errno));
ThrowMsg(PermissibleSetException::FileWriteError, "Error at fsync");
}
markPermissibleFileValid(getFd(fstream), nameFile, true);
}
void readLabelsFromPermissibleFile(const std::string &nameFile, std::vector<std::string> &appLabels)
{
std::ifstream fstream;
openAndLockNameFile(nameFile, fstream);
std::string line;
while (std::getline(fstream, line))
appLabels.push_back(line);
if (fstream.bad()) {
LogError("Failure while reading file " << nameFile << ": " << GetErrnoString(errno));
ThrowMsg(PermissibleSetException::FileReadError, "Failure while reading file");
}
}
void initializeUserPermissibleFile(uid_t uid)
{
std::string nameFile = getPerrmissibleFileLocation(uid, SM_APP_INSTALL_LOCAL);
std::string nameDir = FS::getDirectoryName(nameFile);
if (mkdir(nameDir.c_str(), 0755) != 0 && errno != EEXIST)
ThrowMsg(PermissibleSetException::FileInitError,
"Unable to create directory for user permissible file:" << GetErrnoString(errno));
std::ofstream fstream;
openAndLockNameFile(nameFile, fstream);
SmackLabels::setSmackLabelForFd(getFd(fstream), "_");
markPermissibleFileValid(getFd(fstream), nameFile, true);
}
void removeUserPermissibleFile(uid_t uid)
{
std::string nameFile = getPerrmissibleFileLocation(uid, SM_APP_INSTALL_LOCAL);
std::string nameDir = FS::getDirectoryName(nameFile);
if (unlink(nameFile.c_str()) != 0 && errno != ENOENT)
ThrowMsg(PermissibleSetException::FileRemoveError,
"Unable to remove user permissible file:" << GetErrnoString(errno));
if (rmdir(nameFile.c_str()) != 0 && errno != ENOENT)
ThrowMsg(PermissibleSetException::FileRemoveError,
"Unable to remove directory for user permissible file:" << GetErrnoString(errno));
}
} // PermissibleSet
} // SecurityManager
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