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server.cpp
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server.cpp
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/*
Copyright (C) 2003 - 2018 by David White <dave@whitevine.net>
Part of the Battle for Wesnoth Project http://www.wesnoth.org/
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY.
See the COPYING file for more details.
*/
/**
* @file
* Wesnoth-Server, for multiplayer-games.
*/
#include "server/server.hpp"
#include "config.hpp"
#include "game_config.hpp"
#include "lexical_cast.hpp"
#include "log.hpp"
#include "filesystem.hpp"
#include "multiplayer_error_codes.hpp"
#include "serialization/parser.hpp"
#include "serialization/preprocessor.hpp"
#include "serialization/string_utils.hpp"
#include "serialization/unicode.hpp"
#include "utils/iterable_pair.hpp"
#include "server/game.hpp"
#include "server/metrics.hpp"
#include "server/player.hpp"
#include "server/player_network.hpp"
#include "server/simple_wml.hpp"
#include "server/ban.hpp"
#include "server/user_handler.hpp"
#include "server/sample_user_handler.hpp"
#ifdef HAVE_MYSQLPP
#include "server/forum_user_handler.hpp"
#endif
#include "utils/functional.hpp"
#include <algorithm>
#include <cassert>
#include <cerrno>
#include <cstdlib>
#include <iomanip>
#include <iostream>
#include <map>
#include <set>
#include <sstream>
#include <vector>
#include <queue>
#include <csignal>
#include <boost/algorithm/string.hpp>
static lg::log_domain log_server("server");
/**
* fatal and directly server related errors/warnings,
* ie not caused by erroneous client data
*/
#define ERR_SERVER LOG_STREAM(err, log_server)
/** clients send wrong/unexpected data */
#define WRN_SERVER LOG_STREAM(warn, log_server)
/** normal events */
#define LOG_SERVER LOG_STREAM(info, log_server)
#define DBG_SERVER LOG_STREAM(debug, log_server)
static lg::log_domain log_config("config");
#define ERR_CONFIG LOG_STREAM(err, log_config)
#define WRN_CONFIG LOG_STREAM(warn, log_config)
#include "server/send_receive_wml_helpers.ipp"
namespace wesnothd
{
// we take profiling info on every n requests
int request_sample_frequency = 1;
static void make_add_diff(const simple_wml::node& src, const char* gamelist,
const char* type,
simple_wml::document& out, int index=-1)
{
if (!out.child("gamelist_diff")) {
out.root().add_child("gamelist_diff");
}
simple_wml::node* top = out.child("gamelist_diff");
if(gamelist) {
top = &top->add_child("change_child");
top->set_attr_int("index", 0);
top = &top->add_child("gamelist");
}
simple_wml::node& insert = top->add_child("insert_child");
const simple_wml::node::child_list& children = src.children(type);
assert(!children.empty());
if(index < 0) {
index = children.size() - 1;
}
assert(index < static_cast<int>(children.size()));
insert.set_attr_int("index", index);
children[index]->copy_into(insert.add_child(type));
}
static bool make_delete_diff(const simple_wml::node& src,
const char* gamelist,
const char* type,
const simple_wml::node* remove,
simple_wml::document& out)
{
if (!out.child("gamelist_diff")) {
out.root().add_child("gamelist_diff");
}
simple_wml::node* top = out.child("gamelist_diff");
if(gamelist) {
top = &top->add_child("change_child");
top->set_attr_int("index", 0);
top = &top->add_child("gamelist");
}
const simple_wml::node::child_list& children = src.children(type);
const simple_wml::node::child_list::const_iterator itor =
std::find(children.begin(), children.end(), remove);
if(itor == children.end()) {
return false;
}
const int index = std::distance(children.begin(), itor);
simple_wml::node& del = top->add_child("delete_child");
del.set_attr_int("index", index);
del.add_child(type);
return true;
}
static bool make_change_diff(const simple_wml::node& src,
const char* gamelist,
const char* type,
const simple_wml::node* item,
simple_wml::document& out)
{
if (!out.child("gamelist_diff")) {
out.root().add_child("gamelist_diff");
}
simple_wml::node* top = out.child("gamelist_diff");
if(gamelist) {
top = &top->add_child("change_child");
top->set_attr_int("index", 0);
top = &top->add_child("gamelist");
}
const simple_wml::node::child_list& children = src.children(type);
const simple_wml::node::child_list::const_iterator itor =
std::find(children.begin(), children.end(), item);
if(itor == children.end()) {
return false;
}
simple_wml::node& diff = *top;
simple_wml::node& del = diff.add_child("delete_child");
const int index = std::distance(children.begin(), itor);
del.set_attr_int("index", index);
del.add_child(type);
//inserts will be processed first by the client, so insert at index+1,
//and then when the delete is processed we'll slide into the right position
simple_wml::node& insert = diff.add_child("insert_child");
insert.set_attr_int("index", index + 1);
children[index]->copy_into(insert.add_child(type));
return true;
}
static std::string player_status(const wesnothd::player_record& player) {
std::ostringstream out;
//const network::connection_stats& stats = network::get_connection_stats(pl->first);
//const int time_connected = stats.time_connected / 1000;
//const int seconds = time_connected % 60;
//const int minutes = (time_connected / 60) % 60;
//const int hours = time_connected / (60 * 60);
out << "'" << player.name() << "' @ " << client_address(player.socket());
// << " connected for " << std::setw(2) << hours << ":" << std::setw(2) << minutes << ":" << std::setw(2) << seconds
// << " sent " << stats.bytes_sent << " bytes, received "
// << stats.bytes_received << " bytes";
return out.str();
}
const std::string denied_msg = "You're not allowed to execute this command.";
const std::string help_msg = "Available commands are: adminmsg <msg>,"
" ban <mask> <time> <reason>, bans [deleted] [<ipmask>], clones,"
" dul|deny_unregistered_login [yes|no], kick <mask> [<reason>],"
" k[ick]ban <mask> <time> <reason>, help, games, metrics,"
" netstats [all], [lobby]msg <message>, motd [<message>],"
" pm|privatemsg <nickname> <message>, requests, sample, searchlog <mask>,"
" signout, stats, status [<mask>], unban <ipmask>\n"
"Specific strings (those not in between <> like the command names)"
" are case insensitive.";
server::server(int port, bool keep_alive, const std::string& config_file, std::size_t /*min_threads*/,
std::size_t /*max_threads*/) :
server_base(port, keep_alive),
ban_manager_(),
ip_log_(),
failed_logins_(),
user_handler_(nullptr),
#ifndef _WIN32
input_path_(),
#endif
config_file_(config_file),
cfg_(read_config()),
accepted_versions_(),
redirected_versions_(),
proxy_versions_(),
disallowed_names_(),
admin_passwd_(),
motd_(),
default_max_messages_(0),
default_time_period_(0),
concurrent_connections_(0),
graceful_restart(false),
lan_server_(time(nullptr)),
last_user_seen_time_(time(nullptr)),
restart_command(),
max_ip_log_size_(0),
uh_name_(),
deny_unregistered_login_(false),
save_replays_(false),
replay_save_path_(),
allow_remote_shutdown_(false),
tor_ip_list_(),
failed_login_limit_(),
failed_login_ban_(),
failed_login_buffer_size_(),
version_query_response_("[version]\n[/version]\n", simple_wml::INIT_COMPRESSED),
login_response_("[mustlogin]\n[/mustlogin]\n", simple_wml::INIT_COMPRESSED),
join_lobby_response_("[join_lobby]\n[/join_lobby]\n", simple_wml::INIT_COMPRESSED),
games_and_users_list_("[gamelist]\n[/gamelist]\n", simple_wml::INIT_STATIC),
metrics_(),
last_ping_(time(nullptr)),
last_stats_(last_ping_),
last_uh_clean_(last_ping_),
cmd_handlers_(),
timer_(io_service_)
{
setup_handlers();
load_config();
ban_manager_.read();
start_server();
}
#ifndef _WIN32
void server::handle_sighup(const boost::system::error_code& error, int) {
assert(!error);
WRN_SERVER << "SIGHUP caught, reloading config\n";
cfg_ = read_config();
load_config();
sighup_.async_wait(std::bind(&server::handle_sighup, this, _1, _2));
}
#endif
void server::handle_graceful_timeout(const boost::system::error_code& error)
{
assert(!error);
if(games().empty()) {
process_command("msg All games ended. Shutting down now. Reconnect to the new server instance.", "system");
throw server_shutdown("graceful shutdown timeout");
} else {
timer_.expires_from_now(boost::posix_time::seconds(1));
timer_.async_wait(std::bind(&server::handle_graceful_timeout, this, _1));
}
}
void server::setup_fifo() {
#ifndef _WIN32
const int res = mkfifo(input_path_.c_str(),0660);
if(res != 0 && errno != EEXIST) {
ERR_SERVER << "could not make fifo at '" << input_path_ << "' (" << strerror(errno) << ")\n";
return;
}
int fifo = open(input_path_.c_str(), O_RDWR|O_NONBLOCK);
input_.assign(fifo);
LOG_SERVER << "opened fifo at '" << input_path_ << "'. Server commands may be written to this file.\n";
read_from_fifo();
#endif
}
#ifndef _WIN32
void server::handle_read_from_fifo(const boost::system::error_code& error, std::size_t) {
if(error) {
std::cout << error.message() << std::endl;
return;
}
std::istream is(&admin_cmd_);
std::string cmd;
std::getline(is, cmd);
LOG_SERVER << "Admin Command: type: " << cmd << "\n";
const std::string res = process_command(cmd, "*socket*");
// Only mark the response if we fake the issuer (i.e. command comes from IRC or so)
if (cmd.at(0) == '+') {
LOG_SERVER << "[admin_command_response]\n" << res << "\n" << "[/admin_command_response]\n";
} else {
LOG_SERVER << res << "\n";
}
read_from_fifo();
}
#endif
void server::setup_handlers()
{
#define SETUP_HANDLER(name, function) \
cmd_handlers_[name] = std::bind(function, this, \
std::placeholders::_1, std::placeholders::_2, std::placeholders::_3, std::placeholders::_4);
SETUP_HANDLER("shut_down", &server::shut_down_handler);
SETUP_HANDLER("restart", &server::restart_handler);
SETUP_HANDLER("sample", &server::sample_handler);
SETUP_HANDLER("help", &server::help_handler);
SETUP_HANDLER("stats", &server::stats_handler);
SETUP_HANDLER("metrics", &server::metrics_handler);
SETUP_HANDLER("requests", &server::requests_handler);
SETUP_HANDLER("games", &server::games_handler);
SETUP_HANDLER("wml", &server::wml_handler);
SETUP_HANDLER("netstats", &server::netstats_handler);
SETUP_HANDLER("report", &server::adminmsg_handler);
SETUP_HANDLER("adminmsg", &server::adminmsg_handler);
SETUP_HANDLER("pm", &server::pm_handler);
SETUP_HANDLER("privatemsg", &server::pm_handler);
SETUP_HANDLER("msg", &server::msg_handler);
SETUP_HANDLER("lobbymsg", &server::msg_handler);
SETUP_HANDLER("status", &server::status_handler);
SETUP_HANDLER("clones", &server::clones_handler);
SETUP_HANDLER("bans", &server::bans_handler);
SETUP_HANDLER("ban", &server::ban_handler);
SETUP_HANDLER("unban", &server::unban_handler);
SETUP_HANDLER("ungban", &server::ungban_handler);
SETUP_HANDLER("kick", &server::kick_handler);
SETUP_HANDLER("kickban", &server::kickban_handler);
SETUP_HANDLER("kban", &server::kickban_handler);
SETUP_HANDLER("gban", &server::gban_handler);
SETUP_HANDLER("motd", &server::motd_handler);
SETUP_HANDLER("searchlog", &server::searchlog_handler);
SETUP_HANDLER("sl", &server::searchlog_handler);
SETUP_HANDLER("dul", &server::dul_handler);
SETUP_HANDLER("deny_unregistered_login", &server::dul_handler);
#undef SETUP_HANDLER
}
config server::read_config() const {
config configuration;
if (config_file_.empty()) return configuration;
try {
filesystem::scoped_istream stream = preprocess_file(config_file_);
read(configuration, *stream);
LOG_SERVER << "Server configuration from file: '" << config_file_
<< "' read.\n";
} catch(config::error& e) {
ERR_CONFIG << "ERROR: Could not read configuration file: '"
<< config_file_ << "': '" << e.message << "'.\n";
}
return configuration;
}
void server::load_config() {
# ifndef _WIN32
# ifndef FIFODIR
# warning No FIFODIR set
# define FIFODIR "/var/run/wesnothd"
# endif
const std::string fifo_path = (cfg_["fifo_path"].empty() ? std::string(FIFODIR) + "/socket" : std::string(cfg_["fifo_path"]));
// Reset (replace) the input stream only if the FIFO path changed.
if(fifo_path != input_path_) {
input_.close();
input_path_ = fifo_path;
setup_fifo();
}
# endif
save_replays_ = cfg_["save_replays"].to_bool();
replay_save_path_ = cfg_["replay_save_path"].str();
tor_ip_list_ = utils::split(cfg_["tor_ip_list_path"].empty() ? "" : filesystem::read_file(cfg_["tor_ip_list_path"]), '\n');
admin_passwd_ = cfg_["passwd"].str();
motd_ = cfg_["motd"].str();
lan_server_ = cfg_["lan_server"].to_time_t(0);
uh_name_ = cfg_["user_handler"].str();
deny_unregistered_login_ = cfg_["deny_unregistered_login"].to_bool();
allow_remote_shutdown_ = cfg_["allow_remote_shutdown"].to_bool();
disallowed_names_.clear();
if (cfg_["disallow_names"].empty()) {
disallowed_names_.push_back("*admin*");
disallowed_names_.push_back("*admln*");
disallowed_names_.push_back("*server*");
disallowed_names_.push_back("player");
disallowed_names_.push_back("network");
disallowed_names_.push_back("human");
disallowed_names_.push_back("computer");
disallowed_names_.push_back("ai");
disallowed_names_.push_back("ai?");
} else {
disallowed_names_ = utils::split(cfg_["disallow_names"]);
}
default_max_messages_ = cfg_["max_messages"].to_int(4);
default_time_period_ = cfg_["messages_time_period"].to_int(10);
concurrent_connections_ = cfg_["connections_allowed"].to_int(5);
max_ip_log_size_ = cfg_["max_ip_log_size"].to_int(500);
failed_login_limit_ = cfg_["failed_logins_limit"].to_int(10);
failed_login_ban_ = cfg_["failed_logins_ban"].to_int(3600);
failed_login_buffer_size_ = cfg_["failed_logins_buffer_size"].to_int(500);
// Example config line:
// restart_command="./wesnothd-debug -d -c ~/.wesnoth1.5/server.cfg"
// remember to make new one as a daemon or it will block old one
restart_command = cfg_["restart_command"].str();
accepted_versions_.clear();
const std::string& versions = cfg_["versions_accepted"];
if (versions.empty() == false) {
accepted_versions_ = utils::split(versions);
} else {
accepted_versions_.push_back(game_config::wesnoth_version.str());
accepted_versions_.push_back("test");
}
redirected_versions_.clear();
for(const config &redirect : cfg_.child_range("redirect")) {
for(const std::string &version : utils::split(redirect["version"])) {
redirected_versions_[version] = redirect;
}
}
proxy_versions_.clear();
for(const config &proxy : cfg_.child_range("proxy")) {
for(const std::string &version : utils::split(proxy["version"])) {
proxy_versions_[version] = proxy;
}
}
ban_manager_.load_config(cfg_);
// If there is a [user_handler] tag in the config file
// allow nick registration, otherwise we set user_handler_
// to nullptr. Thus we must check user_handler_ for not being
// nullptr every time we want to use it.
user_handler_.reset();
if (const config &user_handler = cfg_.child("user_handler")) {
if(uh_name_ == "sample") {
user_handler_.reset(new suh(user_handler));
}
#ifdef HAVE_MYSQLPP
else if(uh_name_ == "forum" || uh_name_.empty()) {
user_handler_.reset(new fuh(user_handler));
}
#endif
// Initiate the mailer class with the [mail] tag
// from the config file
if (user_handler_) user_handler_->init_mailer(cfg_.child("mail"));
}
}
bool server::ip_exceeds_connection_limit(const std::string& ip) const
{
if (concurrent_connections_ == 0) return false;
std::size_t connections = 0;
for(const auto& player: player_connections_) {
if (client_address(player.socket()) == ip) {
++connections;
}
}
return connections >= concurrent_connections_;
}
std::string server::is_ip_banned(const std::string& ip) {
if (!tor_ip_list_.empty()) {
if (find(tor_ip_list_.begin(), tor_ip_list_.end(), ip) != tor_ip_list_.end()) return "TOR IP";
}
return ban_manager_.is_ip_banned(ip);
}
void server::dump_stats(const time_t& now) {
last_stats_ = now;
LOG_SERVER << "Statistics:"
<< "\tnumber_of_games = " << games().size()
<< "\tnumber_of_users = " << player_connections_.size() << "\n";
}
void server::clean_user_handler(const time_t& now) {
if(!user_handler_) {
return;
}
last_uh_clean_ = now;
user_handler_->clean_up();
}
void server::handle_new_client(socket_ptr socket)
{
async_send_doc(socket, version_query_response_,
std::bind(&server::handle_version, this, _1)
);
}
void server::handle_version(socket_ptr socket)
{
async_receive_doc(socket,
std::bind(&server::read_version, this, _1, _2)
);
}
void server::read_version(socket_ptr socket, std::shared_ptr<simple_wml::document> doc)
{
if (const simple_wml::node* const version = doc->child("version")) {
const simple_wml::string_span& version_str_span = (*version)["version"];
const std::string version_str(version_str_span.begin(),
version_str_span.end());
std::vector<std::string>::const_iterator accepted_it;
// Check if it is an accepted version.
accepted_it = std::find_if(accepted_versions_.begin(), accepted_versions_.end(),
std::bind(&utils::wildcard_string_match, version_str, _1));
if(accepted_it != accepted_versions_.end()) {
LOG_SERVER << client_address(socket)
<< "\tplayer joined using accepted version " << version_str
<< ":\ttelling them to log in.\n";
async_send_doc(socket, login_response_, std::bind(&server::login, this, _1));
return;
}
simple_wml::document response;
// Check if it is a redirected version
for(const auto& redirect_version : redirected_versions_) {
if(utils::wildcard_string_match(version_str, redirect_version.first)) {
LOG_SERVER << client_address(socket)
<< "\tplayer joined using version " << version_str
<< ":\tredirecting them to " << redirect_version.second["host"]
<< ":" << redirect_version.second["port"] << "\n";
simple_wml::node& redirect = response.root().add_child("redirect");
for(const auto& attr : redirect_version.second.attribute_range()) {
redirect.set_attr_dup(attr.first.c_str(), attr.second.str().c_str());
}
send_to_player(socket, response);
return;
}
}
LOG_SERVER << client_address(socket)
<< "\tplayer joined using unknown version " << version_str
<< ":\trejecting them\n";
// For compatibility with older clients
response.set_attr("version", accepted_versions_.begin()->c_str());
simple_wml::node& reject = response.root().add_child("reject");
reject.set_attr_dup("accepted_versions", utils::join(accepted_versions_).c_str());
send_to_player(socket, response);
} else {
LOG_SERVER << client_address(socket)
<< "\tclient didn't send its version: rejecting\n";
}
}
void server::login(socket_ptr socket)
{
async_receive_doc(socket,
std::bind(&server::handle_login, this, _1, _2)
);
}
void server::handle_login(socket_ptr socket, std::shared_ptr<simple_wml::document> doc)
{
if(const simple_wml::node* const login = doc->child("login")) {
if(!is_login_allowed(socket, login)) {
server::login(socket); // keep reading logins from client until we get a successful one
}
} else {
async_send_error(socket, "You must login first.", MP_MUST_LOGIN);
}
}
bool server::is_login_allowed(socket_ptr socket, const simple_wml::node* const login)
{
// Check if the username is valid (all alpha-numeric plus underscore and hyphen)
std::string username = (*login)["username"].to_string();
if (!utils::isvalid_username(username)) {
async_send_error(socket, "The nickname '" + username + "' contains invalid "
"characters. Only alpha-numeric characters, underscores and hyphens"
"are allowed.", MP_INVALID_CHARS_IN_NAME_ERROR);
return false;
}
if (username.size() > 20) {
async_send_error(socket, "The nickname '" + username + "' is too long. Nicks must be 20 characters or less.",
MP_NAME_TOO_LONG_ERROR);
return false;
}
// Check if the username is allowed.
for (std::vector<std::string>::const_iterator d_it = disallowed_names_.begin();
d_it != disallowed_names_.end(); ++d_it)
{
if (utils::wildcard_string_match(utf8::lowercase(username),
utf8::lowercase(*d_it)))
{
async_send_error(socket, "The nickname '" + username + "' is reserved and cannot be used by players",
MP_NAME_RESERVED_ERROR);
return false;
}
}
// Check the username isn't already taken
auto p = player_connections_.get<name_t>().find(username);
bool name_taken = p != player_connections_.get<name_t>().end();
// Check for password
bool registered;
if(!authenticate(socket, username, (*login)["password"].to_string(), name_taken, registered))
return true; // it's a failed login but we don't want to call server::login again
// because send_password_request() will handle the next network write and read instead
// If we disallow unregistered users and this user is not registered send an error
if(user_handler_ && !registered && deny_unregistered_login_) {
async_send_error(socket, "The nickname '" + username + "' is not registered. "
"This server disallows unregistered nicknames.", MP_NAME_UNREGISTERED_ERROR);
return false;
}
const bool is_moderator = user_handler_ && user_handler_->user_is_moderator(username);
const user_handler::BAN_TYPE auth_ban = user_handler_
? user_handler_->user_is_banned(username, client_address(socket))
: user_handler::BAN_NONE;
if(auth_ban) {
std::string ban_type_desc;
std::string ban_reason;
const char* msg_numeric;
switch(auth_ban) {
case user_handler::BAN_USER:
ban_type_desc = "account";
msg_numeric = MP_NAME_AUTH_BAN_USER_ERROR;
ban_reason = "a ban has been issued on your user account.";
break;
case user_handler::BAN_IP:
ban_type_desc = "IP address";
msg_numeric = MP_NAME_AUTH_BAN_IP_ERROR;
ban_reason = "a ban has been issued on your IP address.";
break;
case user_handler::BAN_EMAIL:
ban_type_desc = "email address";
msg_numeric = MP_NAME_AUTH_BAN_EMAIL_ERROR;
ban_reason = "a ban has been issued on your email address.";
break;
default:
ban_type_desc = "<unknown ban type>";
msg_numeric = "";
ban_reason = ban_type_desc;
}
if(!is_moderator) {
LOG_SERVER << client_address(socket) << "\t" << username
<< "\tis banned by user_handler (" << ban_type_desc << ")\n";
async_send_error(socket, "You are banned from this server: " + ban_reason, msg_numeric);
return false;
} else {
LOG_SERVER << client_address(socket) << "\t" << username
<< "\tis banned by user_handler (" << ban_type_desc << "), "
<< "ignoring due to moderator flag\n";
}
}
if(name_taken) {
if(registered) {
// If there is already a client using this username kick it
process_command("kick " + p->info().name() + " autokick by registered user", username);
} else {
async_send_error(socket, "The nickname '" + username + "' is already taken.", MP_NAME_TAKEN_ERROR);
return false;
}
}
simple_wml::node& player_cfg = games_and_users_list_.root().add_child("user");
async_send_doc(socket, join_lobby_response_,
std::bind(&server::add_player, this, _1,
wesnothd::player(username, player_cfg, registered,
default_max_messages_, default_time_period_,
user_handler_ && user_handler_->user_is_moderator(username))
)
);
LOG_SERVER << client_address(socket) << "\t" << username
<< "\thas logged on" << (registered ? " to a registered account" : "") << "\n";
if(is_moderator) {
LOG_SERVER << "Admin automatically recognized: IP: "
<< client_address(socket) << "\tnick: "
<< username << std::endl;
// This string is parsed by the client!
send_server_message(socket, "You are now recognized as an administrator. "
"If you no longer want to be automatically authenticated use '/query signout'.");
}
if(auth_ban) {
send_server_message(socket, "You are currently banned by the forum administration.");
}
// Log the IP
connection_log ip_name = connection_log(username, client_address(socket), 0);
if (std::find(ip_log_.begin(), ip_log_.end(), ip_name) == ip_log_.end()) {
ip_log_.push_back(ip_name);
// Remove the oldest entry if the size of the IP log exceeds the maximum size
if(ip_log_.size() > max_ip_log_size_) ip_log_.pop_front();
}
return true;
}
bool server::authenticate(socket_ptr socket, const std::string& username, const std::string& password, bool name_taken, bool& registered)
{
// Current login procedure for registered nicks is:
// - Client asks to log in with a particular nick
// - Server sends client random nonce plus some info
// generated from the original hash that is required to
// regenerate the hash
// - Client generates hash for the user provided password
// and mixes it with the received random nonce
// - Server received password hash hashed with the nonce,
// applies the nonce to the valid hash and compares the results
registered = false;
if(user_handler_) {
const bool exists = user_handler_->user_exists(username);
// This name is registered but the account is not active
if(exists && !user_handler_->user_is_active(username)) {
async_send_warning(socket, "The nickname '" + username + "' is inactive. You cannot claim ownership of this "
"nickname until you activate your account via email or ask an administrator to do it for you.", MP_NAME_INACTIVE_WARNING);
//registered = false;
}
else if(exists) {
// This name is registered and no password provided
if(password.empty()) {
if(!name_taken) {
send_password_request(socket, "The nickname '" + username +"' is registered on this server.",
username, MP_PASSWORD_REQUEST);
} else {
send_password_request(socket, "The nickname '" + username + "' is registered on this server."
"\n\nWARNING: There is already a client using this username, "
"logging in will cause that client to be kicked!",
username, MP_PASSWORD_REQUEST_FOR_LOGGED_IN_NAME, true);
}
return false;
}
// A password (or hashed password) was provided, however
// there is no seed
if(seeds_[reinterpret_cast<long int>(socket.get())].empty()) {
send_password_request(socket, "Please try again.", username, MP_NO_SEED_ERROR);
return false;
}
// This name is registered and an incorrect password provided
else if(!(user_handler_->login(username, password, seeds_[reinterpret_cast<unsigned long>(socket.get())]))) {
const time_t now = time(nullptr);
// Reset the random seed
seeds_.erase(reinterpret_cast<unsigned long>(socket.get()));
login_log login_ip = login_log(client_address(socket), 0, now);
std::deque<login_log>::iterator i = std::find(failed_logins_.begin(), failed_logins_.end(), login_ip);
if(i == failed_logins_.end()) {
failed_logins_.push_back(login_ip);
i = --failed_logins_.end();
// Remove oldest entry if maximum size is exceeded
if(failed_logins_.size() > failed_login_buffer_size_)
failed_logins_.pop_front();
}
if (i->first_attempt + failed_login_ban_ < now) {
// Clear and move to the beginning
failed_logins_.erase(i);
failed_logins_.push_back(login_ip);
i = --failed_logins_.end();
}
i->attempts++;
if (i->attempts > failed_login_limit_) {
LOG_SERVER << ban_manager_.ban(login_ip.ip, now + failed_login_ban_, "Maximum login attempts exceeded", "automatic", "", username);
async_send_error(socket, "You have made too many failed login attempts.", MP_TOO_MANY_ATTEMPTS_ERROR);
} else {
send_password_request(socket, "The password you provided for the nickname '" + username +
"' was incorrect.", username, MP_INCORRECT_PASSWORD_ERROR);
}
// Log the failure
LOG_SERVER << client_address(socket) << "\t"
<< "Login attempt with incorrect password for nickname '" << username << "'.\n";
return false;
}
// This name exists and the password was neither empty nor incorrect
registered = true;
// Reset the random seed
seeds_.erase(reinterpret_cast<long int>(socket.get()));
user_handler_->user_logged_in(username);
}
}
return true;
}
void server::send_password_request(socket_ptr socket, const std::string& msg,
const std::string& user, const char* error_code, bool force_confirmation)
{
std::string salt = user_handler_->extract_salt(user);
// If using crypt_blowfish, use 32 random Base64 characters, cryptographic-strength, 192 bits entropy
// else (phppass, MD5, $H$), use 8 random integer digits, not secure, do not use, this is crap, 29.8 bits entropy
std::string nonce {
(salt[1] == '2') ? user_handler_->create_secure_nonce() : user_handler_->create_unsecure_nonce()
};
std::string password_challenge = salt + nonce;
if(user_handler_->use_phpbb_encryption() && salt.empty()) {
async_send_error(socket, "Even though your nickname is registered on this server you "
"cannot log in due to an error in the hashing algorithm. "
"Logging into your forum account on https://forums.wesnoth.org "
"may fix this problem.");
login(socket);
return;
}
seeds_[reinterpret_cast<long int>(socket.get())] = nonce;
simple_wml::document doc;
simple_wml::node& e = doc.root().add_child("error");
e.set_attr_dup("message", msg.c_str());
e.set_attr("password_request", "yes");
e.set_attr("phpbb_encryption", user_handler_->use_phpbb_encryption() ? "yes" : "no");
e.set_attr_dup("salt", password_challenge.c_str());
e.set_attr("force_confirmation", force_confirmation ? "yes" : "no");
if(*error_code != '\0') {
e.set_attr("error_code", error_code);
}
async_send_doc(socket, doc,
std::bind(&server::login, this, _1)
);
}
void server::add_player(socket_ptr socket, const wesnothd::player& player)
{
bool inserted;
std::tie(std::ignore, inserted) = player_connections_.insert(player_connections::value_type(socket, player));
assert(inserted);
send_to_player(socket, games_and_users_list_);
if (!motd_.empty()) {
send_server_message(socket, motd_);
}
read_from_player(socket);
// Send other players in the lobby the update that the player has joined
simple_wml::document diff;
make_add_diff(games_and_users_list_.root(), nullptr, "user", diff);
send_to_lobby(diff, socket);
}
void server::read_from_player(socket_ptr socket)
{
async_receive_doc(socket,
std::bind(&server::handle_read_from_player, this, _1, _2),
std::bind(&server::remove_player, this, _1)
);
}
void server::handle_read_from_player(socket_ptr socket, std::shared_ptr<simple_wml::document> doc)
{
read_from_player(socket);
//DBG_SERVER << client_address(socket) << "\tWML received:\n" << doc->output() << std::endl;
if(doc->child("refresh_lobby")) {
send_to_player(socket, games_and_users_list_);
return;
}
if(simple_wml::node* whisper = doc->child("whisper")) {
handle_whisper(socket, *whisper);
return;
}
if(simple_wml::node* query = doc->child("query")) {
handle_query(socket, *query);
return;
}
if(simple_wml::node* nickserv = doc->child("nickserv")) {
handle_nickserv(socket, *nickserv);
return;
}
if(!player_is_in_game(socket))
handle_player_in_lobby(socket, doc);
else
handle_player_in_game(socket, doc);
}
void server::handle_player_in_lobby(socket_ptr socket, std::shared_ptr<simple_wml::document> doc) {
if(simple_wml::node* message = doc->child("message")) {
handle_message(socket, *message);
return;
}
if(simple_wml::node* create_game = doc->child("create_game")) {
handle_create_game(socket, *create_game);
return;
}
if(simple_wml::node* join = doc->child("join")) {
handle_join_game(socket, *join);
return;
}
}
void server::handle_whisper(socket_ptr socket, simple_wml::node& whisper)
{
if((whisper["receiver"].empty()) || (whisper["message"].empty())) {
static simple_wml::document data(
"[message]\n"
"message=\"Invalid number of arguments\"\n"
"sender=\"server\"\n"
"[/message]\n", simple_wml::INIT_COMPRESSED);
send_to_player(socket, data);
return;
}
whisper.set_attr_dup("sender", player_connections_.find(socket)->name().c_str());
auto receiver_iter = player_connections_.get<name_t>().find(whisper["receiver"].to_string());
if(receiver_iter == player_connections_.get<name_t>().end()) {
send_server_message(socket, "Can't find '" + whisper["receiver"].to_string() + "'.");
return;
}
auto g = player_connections_.find(socket)->get_game();
if(g && g->started() && g->is_player(receiver_iter->socket()) && g->is_member(socket)) {
send_server_message(socket, "You cannot send private messages to players in a running game you observe.");
return;
}
simple_wml::document cwhisper;
whisper.copy_into(cwhisper.root().add_child("whisper"));
send_to_player(receiver_iter->socket(), cwhisper);
}
void server::handle_query(socket_ptr socket, simple_wml::node& query)
{
auto iter = player_connections_.find(socket);
if(iter == player_connections_.end())
return;
wesnothd::player& player = iter->info();
const std::string command(query["type"].to_string());
std::ostringstream response;
const std::string& query_help_msg = "Available commands are: adminmsg <msg>, help, games, metrics,"
" motd, netstats [all], requests, sample, stats, status, wml.";
// Commands a player may issue.
if (command == "status") {
response << process_command(command + " " + player.name(), player.name());
} else if (command.compare(0, 8, "adminmsg") == 0 || command.compare(0, 6, "report") == 0
|| command == "games"
|| command == "metrics"
|| command == "motd"
|| command == "netstats"
|| command == "netstats all"
|| command == "requests"
|| command == "sample"
|| command == "stats"