// // Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018 // // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // #pragma once #include "td/mtproto/AuthKey.h" #include "td/utils/logging.h" #include "td/utils/Slice.h" #include "td/utils/Status.h" #include <set> namespace td { namespace mtproto { struct ServerSalt { int64 salt; double valid_since; double valid_until; }; template <class StorerT> void store(const ServerSalt &salt, StorerT &storer) { storer.template store_binary<int64>(salt.salt); storer.template store_binary<double>(salt.valid_since); storer.template store_binary<double>(salt.valid_until); } template <class ParserT> void parse(ServerSalt &salt, ParserT &parser) { salt.salt = parser.fetch_long(); salt.valid_since = parser.fetch_double(); salt.valid_until = parser.fetch_double(); } class MessageIdDuplicateChecker { public: Status check(int64 message_id); private: static constexpr size_t MAX_SAVED_MESSAGE_IDS = 1000; std::set<int64> saved_message_ids_; }; class AuthData { public: AuthData(); AuthData(const AuthData &) = delete; AuthData &operator=(const AuthData &) = delete; AuthData(AuthData &&) = delete; AuthData &operator=(AuthData &&) = delete; ~AuthData() = default; bool is_ready(double now); uint64 session_id_; void set_main_auth_key(AuthKey auth_key) { main_auth_key_ = std::move(auth_key); } const AuthKey &get_main_auth_key() const { // CHECK(has_main_auth_key()); return main_auth_key_; } bool has_main_auth_key() const { return !main_auth_key_.empty(); } bool need_main_auth_key() const { return !has_main_auth_key(); } void set_tmp_auth_key(AuthKey auth_key) { CHECK(!auth_key.empty()); tmp_auth_key_ = std::move(auth_key); } const AuthKey &get_tmp_auth_key() const { // CHECK(has_tmp_auth_key()); return tmp_auth_key_; } bool was_tmp_auth_key() const { return use_pfs() && !tmp_auth_key_.empty(); } bool need_tmp_auth_key(double now) const { if (!use_pfs()) { return false; } if (tmp_auth_key_.empty()) { return true; } if (now > tmp_auth_key_.expire_at() - 60 * 60 * 2 /*2 hours*/) { return true; } if (!has_tmp_auth_key(now)) { return true; } return false; } void drop_main_auth_key() { main_auth_key_ = AuthKey(); } void drop_tmp_auth_key() { tmp_auth_key_ = AuthKey(); } bool has_tmp_auth_key(double now) const { if (!use_pfs()) { return false; } if (tmp_auth_key_.empty()) { return false; } if (now > tmp_auth_key_.expire_at() - 60 * 60 /*1 hour*/) { return false; } return true; } const AuthKey &get_auth_key() const { if (use_pfs()) { return get_tmp_auth_key(); } return get_main_auth_key(); } bool has_auth_key(double now) const { if (use_pfs()) { return has_tmp_auth_key(now); } return has_main_auth_key(); } bool get_auth_flag() const { return main_auth_key_.auth_flag(); } void set_auth_flag(bool auth_flag) { main_auth_key_.set_auth_flag(auth_flag); if (!auth_flag) { drop_tmp_auth_key(); } } bool get_bind_flag() const { return !use_pfs() || tmp_auth_key_.auth_flag(); } void on_bind() { CHECK(use_pfs()); tmp_auth_key_.set_auth_flag(true); } Slice get_header() { if (use_pfs()) { return tmp_auth_key_.need_header() ? Slice(header_) : Slice(); } else { return main_auth_key_.need_header() ? Slice(header_) : Slice(); } } void set_header(std::string header) { header_ = std::move(header); } void on_api_response() { if (use_pfs()) { if (tmp_auth_key_.auth_flag()) { tmp_auth_key_.set_need_header(false); } } else { if (main_auth_key_.auth_flag()) { main_auth_key_.set_need_header(false); } } } uint64 get_session_id() const { return session_id_; } double get_server_time(double now) const { return server_time_difference_ + now; } double get_server_time_difference() const { return server_time_difference_; } // diff == msg_id / 2^32 - now == old_server_now - now <= server_now - now // server_time_difference >= max{diff} bool update_server_time_difference(double diff); void set_server_time_difference(double diff) { server_time_difference_was_updated_ = false; server_time_difference_ = diff; } uint64 get_server_salt(double now) { update_salt(now); return server_salt_.salt; } void set_server_salt(uint64 salt, double now) { server_salt_.salt = salt; double server_time = get_server_time(now); server_salt_.valid_since = server_time; server_salt_.valid_until = server_time + 60 * 10; future_salts_.clear(); } bool is_server_salt_valid(double now) { return server_salt_.valid_until > get_server_time(now) + 60; } bool has_salt(double now) { update_salt(now); return is_server_salt_valid(now); } bool need_future_salts(double now) { update_salt(now); return future_salts_.empty() || !is_server_salt_valid(now); } void set_future_salts(const std::vector<ServerSalt> &salts, double now); std::vector<ServerSalt> get_future_salts() const; int64 next_message_id(double now); bool is_valid_outbound_msg_id(int64 id, double now); bool is_valid_inbound_msg_id(int64 id, double now); Status check_packet(int64 session_id, int64 message_id, double now, bool &time_difference_was_updated); Status check_update(int64 message_id) { return updates_duplicate_checker_.check(message_id); } int32 next_seq_no(bool is_content_related) { int32 res = seq_no_; if (is_content_related) { res |= 1; seq_no_ += 2; } return res; } void clear_seq_no() { seq_no_ = 0; } void set_use_pfs(bool use_pfs) { use_pfs_ = use_pfs; } bool use_pfs() const { return use_pfs_; } private: bool use_pfs_ = true; AuthKey main_auth_key_; AuthKey tmp_auth_key_; bool server_time_difference_was_updated_ = false; double server_time_difference_ = 0; ServerSalt server_salt_; int64 last_message_id_ = 0; int32 seq_no_ = 0; std::string header_; std::vector<ServerSalt> future_salts_; MessageIdDuplicateChecker duplicate_checker_; MessageIdDuplicateChecker updates_duplicate_checker_; void update_salt(double now); }; } // namespace mtproto } // namespace td