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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/policy/browser_dm_token_storage_linux.h"
#include <string>
#include <string_view>
#include "base/base64url.h"
#include "base/files/file_util.h"
#include "base/files/important_file_writer.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/hash/sha1.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/syslog_logging.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "base/threading/scoped_blocking_call.h"
#include "chrome/common/chrome_paths.h"
#include "components/policy/core/common/policy_logger.h"
namespace policy {
namespace {
const char kDmTokenBaseDir[] = FILE_PATH_LITERAL("Policy/Enrollment/");
const char kMachineIdFilename[] = FILE_PATH_LITERAL("/etc/machine-id");
#if !BUILDFLAG(IS_CHROMEOS)
const char kEnrollmentTokenFilename[] =
FILE_PATH_LITERAL("enrollment/CloudManagementEnrollmentToken");
// Enrollment Mandatory Option.
const char kEnrollmentOptionsFilePath[] =
FILE_PATH_LITERAL("enrollment/CloudManagementEnrollmentOptions");
const char kEnrollmentMandatoryOption[] = "Mandatory";
#endif // !BUILDFLAG(IS_CHROMEOS)
bool GetDmTokenFilePath(base::FilePath* token_file_path,
const std::string& client_id,
bool create_dir) {
if (!base::PathService::Get(chrome::DIR_USER_DATA, token_file_path)) {
LOG_POLICY(WARNING, CBCM_ENROLLMENT)
<< "Failed to get user data directory path.";
return false;
}
*token_file_path = token_file_path->Append(kDmTokenBaseDir);
if (create_dir && !base::CreateDirectory(*token_file_path)) {
LOG_POLICY(WARNING, CBCM_ENROLLMENT)
<< "Failed to create DMToken storage directory: " << *token_file_path;
return false;
}
*token_file_path = token_file_path->Append(client_id);
return true;
}
bool StoreDMTokenInUserDataDir(const std::string& token,
const std::string& client_id) {
base::FilePath token_file_path;
if (!GetDmTokenFilePath(&token_file_path, client_id, /*create_dir=*/true)) {
return false;
}
return base::ImportantFileWriter::WriteFileAtomically(token_file_path, token);
}
bool DeleteDMTokenFromUserDataDir(const std::string& client_id) {
base::FilePath token_file_path;
if (!GetDmTokenFilePath(&token_file_path, client_id, /*create_dir=*/false)) {
return false;
}
return base::DeleteFile(token_file_path);
}
} // namespace
BrowserDMTokenStorageLinux::BrowserDMTokenStorageLinux()
: task_runner_(base::ThreadPool::CreateTaskRunner({base::MayBlock()})) {}
BrowserDMTokenStorageLinux::~BrowserDMTokenStorageLinux() = default;
std::string BrowserDMTokenStorageLinux::InitClientId() {
if (!client_id_.empty())
return client_id_;
// The client ID is derived from /etc/machine-id
// (https://www.freedesktop.org/software/systemd/man/machine-id.html). As per
// guidelines, this ID must not be transmitted outside of the machine, which
// is why we hash it first and then encode it in base64 before transmitting
// it.
const int machine_id_size = 32;
std::string machine_id;
machine_id = ReadMachineIdFile();
std::string_view machine_id_trimmed =
base::TrimWhitespaceASCII(machine_id, base::TRIM_TRAILING);
if (machine_id_trimmed.size() != machine_id_size) {
SYSLOG(ERROR) << "Error: /etc/machine-id contains "
<< machine_id_trimmed.size() << " characters ("
<< machine_id_size << " were expected).";
return std::string();
}
std::string machine_id_base64;
base::Base64UrlEncode(base::SHA1HashString(std::string(machine_id_trimmed)),
base::Base64UrlEncodePolicy::OMIT_PADDING,
&machine_id_base64);
client_id_ = machine_id_base64;
return client_id_;
}
std::string BrowserDMTokenStorageLinux::InitEnrollmentToken() {
#if BUILDFLAG(IS_CHROMEOS)
return std::string();
#else
std::string enrollment_token;
base::FilePath dir_policy_files_path;
if (!base::PathService::Get(chrome::DIR_POLICY_FILES,
&dir_policy_files_path)) {
return std::string();
}
base::FilePath token_file_path =
dir_policy_files_path.Append(kEnrollmentTokenFilename);
if (!base::ReadFileToString(token_file_path, &enrollment_token))
return std::string();
return std::string(
base::TrimWhitespaceASCII(enrollment_token, base::TRIM_ALL));
#endif // BUILDFLAG(IS_CHROMEOS)
}
std::string BrowserDMTokenStorageLinux::InitDMToken() {
base::FilePath token_file_path;
if (!GetDmTokenFilePath(&token_file_path, InitClientId(), false))
return std::string();
std::string token;
if (!base::ReadFileToString(token_file_path, &token))
return std::string();
return std::string(base::TrimWhitespaceASCII(token, base::TRIM_ALL));
}
bool BrowserDMTokenStorageLinux::InitEnrollmentErrorOption() {
#if BUILDFLAG(IS_CHROMEOS)
return false;
#else
std::string options;
base::FilePath dir_policy_files_path;
if (!base::PathService::Get(chrome::DIR_POLICY_FILES,
&dir_policy_files_path)) {
return false;
}
base::FilePath options_file_path =
dir_policy_files_path.Append(kEnrollmentOptionsFilePath);
if (!base::ReadFileToString(options_file_path, &options))
return false;
return base::TrimWhitespaceASCII(options, base::TRIM_ALL) ==
kEnrollmentMandatoryOption;
#endif // BUILDFLAG(IS_CHROMEOS)
}
bool BrowserDMTokenStorageLinux::CanInitEnrollmentToken() const {
return true;
}
BrowserDMTokenStorage::StoreTask BrowserDMTokenStorageLinux::SaveDMTokenTask(
const std::string& token,
const std::string& client_id) {
return base::BindOnce(&StoreDMTokenInUserDataDir, token, client_id);
}
BrowserDMTokenStorage::StoreTask BrowserDMTokenStorageLinux::DeleteDMTokenTask(
const std::string& client_id) {
return base::BindOnce(&DeleteDMTokenFromUserDataDir, client_id);
}
scoped_refptr<base::TaskRunner>
BrowserDMTokenStorageLinux::SaveDMTokenTaskRunner() {
return task_runner_;
}
std::string BrowserDMTokenStorageLinux::ReadMachineIdFile() {
std::string machine_id;
if (!base::ReadFileToString(base::FilePath(kMachineIdFilename), &machine_id))
return std::string();
return machine_id;
}
} // namespace policy
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