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/*
* Copyright (c) 2016-2023 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())
LogAndThrowErrno(PermissibleSetException::FileOpenError, "open file " << nameFile);
if (TEMP_FAILURE_RETRY(flock(getFd(fstream), LOCK_EX)))
LogAndThrowErrno(PermissibleSetException::FileLockError, "lock file " << nameFile);
}
std::string getPermissibleFileLocation(uid_t uid, int installationType)
{
TizenPlatformConfig tpc(uid);
if ((installationType == SM_APP_INSTALL_GLOBAL)
|| (installationType == SM_APP_INSTALL_PRELOADED))
return std::string(LOCAL_STATE_INSTALL_DIR) + "/" + APPS_LABELS_FILE;
else
return std::string(LOCAL_STATE_INSTALL_DIR) + "/" + std::to_string(uid)
+ "/" + APPS_LABELS_FILE;
}
static void markPermissibleFileValid(int fd, const std::string &nameFile, bool valid)
{
const auto mode = valid ? 00444 : 00000;
if (TEMP_FAILURE_RETRY(fchmod(fd, mode)))
LogAndThrowErrno(PermissibleSetException::FileWriteError, "fchmod " << nameFile);
}
void updatePermissibleFile(uid_t uid, int installationType,
const std::vector<std::string> &labelsToAddForUser,
const std::vector<std::string> &labelsToRemoveForUser)
{
std::string nameFile = getPermissibleFileLocation(uid, installationType);
std::vector<std::string> labelsForUser;
{
std::ifstream fstream;
try {
openAndLockNameFile(nameFile, fstream);
std::string line;
while (std::getline(fstream, line)) {
bool flag = true;
for (auto &l : labelsToRemoveForUser)
if (l == line) {
flag = false;
break;
}
if (flag)
labelsForUser.push_back(line);
}
} catch (const PermissibleSet::PermissibleSetException::FileOpenError &e) {
LogDebug("File doesn't exist yet, needs to be created - just continue; error:" << e.DumpToString());
}
for (auto &l : labelsToAddForUser)
labelsForUser.push_back(l);
}
std::ofstream fstream;
openAndLockNameFile(nameFile, fstream);
markPermissibleFileValid(getFd(fstream), nameFile, false);
for (auto &label : labelsForUser) {
fstream << label << '\n';
if (fstream.bad())
LogAndThrowErrno(PermissibleSetException::PermissibleSetException::FileWriteError,
"write to file " << nameFile);
}
if (fstream.flush().fail())
LogAndThrowErrno(PermissibleSetException::FileWriteError, "fflush " << nameFile);
if (fsync(getFd(fstream)) == -1)
LogAndThrowErrno(PermissibleSetException::FileWriteError, "fsync " << nameFile);
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())
LogAndThrowErrno(PermissibleSetException::FileReadError, "reading file " << nameFile);
}
void initializeUserPermissibleFile(uid_t uid)
{
std::string nameFile = getPermissibleFileLocation(uid, SM_APP_INSTALL_LOCAL);
std::string nameDir = FS::getDirectoryName(nameFile);
if (mkdir(nameDir.c_str(), 0755) != 0 && errno != EEXIST)
ThrowErrno(PermissibleSetException::FileInitError,
"create directory for user permissible file");
std::ofstream fstream;
openAndLockNameFile(nameFile, fstream);
SmackLabels::setSmackLabelForFd(getFd(fstream), "_");
markPermissibleFileValid(getFd(fstream), nameFile, true);
}
void removeUserPermissibleFile(uid_t uid)
{
std::string nameFile = getPermissibleFileLocation(uid, SM_APP_INSTALL_LOCAL);
std::string nameDir = FS::getDirectoryName(nameFile);
if (unlink(nameFile.c_str()) != 0 && errno != ENOENT)
ThrowErrno(PermissibleSetException::FileRemoveError,
"remove user permissible file");
if (rmdir(nameFile.c_str()) != 0 && errno != ENOENT)
ThrowErrno(PermissibleSetException::FileRemoveError,
"remove directory for user permissible file");
}
} // PermissibleSet
} // SecurityManager
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