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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/ash/smb_client/smb_file_system_id.h"
#include <string.h>
#include <string>
#include "base/check_op.h"
#include "base/files/file_path.h"
#include "base/rand_util.h"
#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
namespace ash::smb_client {
namespace {
constexpr char kDelimiter[] = "@@";
constexpr char kKerberosSymbol[] = "kerberos_chromad";
constexpr char kUserPrefix[] = "user=";
constexpr int kRandomIdBytes = 8;
std::vector<std::string> GetComponents(const std::string& file_system_id) {
std::vector<std::string> components = SplitStringUsingSubstr(
file_system_id, kDelimiter, base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
DCHECK_GE(components.size(), 2u);
DCHECK_LE(components.size(), 3u);
return components;
}
std::string GenerateRandomId() {
uint8_t rand_bytes[kRandomIdBytes];
base::RandBytes(rand_bytes);
// Encoding to hex ensure that there are no non-alpha characters in the id
// (i.e. no @ delimiters).
return base::HexEncode(rand_bytes);
}
} // namespace.
std::string CreateFileSystemId(const base::FilePath& share_path,
bool is_kerberos_chromad) {
const std::string file_system_id =
base::StrCat({GenerateRandomId(), kDelimiter, share_path.value()});
if (is_kerberos_chromad) {
return base::StrCat({file_system_id, kDelimiter, kKerberosSymbol});
}
return file_system_id;
}
std::string CreateFileSystemIdForUser(const base::FilePath& share_path,
const std::string& username) {
// Disallow down-level logon names.
CHECK_EQ(username.find('\\'), std::string::npos);
const std::string base_file_system_id =
base::StrCat({GenerateRandomId(), kDelimiter, share_path.value()});
if (username.empty()) {
return base_file_system_id;
}
return base::StrCat({base_file_system_id, kDelimiter, kUserPrefix, username});
}
base::FilePath GetSharePathFromFileSystemId(const std::string& file_system_id) {
const std::vector<std::string> components = GetComponents(file_system_id);
DCHECK_GE(components.size(), 1u);
return base::FilePath(components[1]);
}
bool IsKerberosChromadFileSystemId(const std::string& file_system_id) {
const std::vector<std::string> components = GetComponents(file_system_id);
return components.size() >= 3 && components[2] == kKerberosSymbol;
}
std::optional<std::string> GetUserFromFileSystemId(
const std::string& file_system_id) {
const std::vector<std::string> components = GetComponents(file_system_id);
if (components.size() < 3) {
return std::nullopt;
}
std::optional<std::string_view> remainder = base::RemovePrefix(
components[2], kUserPrefix, base::CompareCase::SENSITIVE);
if (!remainder) {
return std::nullopt;
}
return std::string(*remainder);
}
} // namespace ash::smb_client
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