index : minetest.git	gpcf lifo-fixes release
	modified minetest for gpcfs purposes	gpcf

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path: root/textures/base/pack/fast_btn.png

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generated by cgit v1.2.3 (git 2.39.1) at 2025-02-06 13:37:30 +0000

/*
Minetest
Copyright (C) 2015 nerzhul, Loic Blot <loic.blot@unix-experience.fr>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "server.h"
#include "log.h"

#include "content_abm.h"
#include "content_sao.h"
#include "emerge.h"
#include "nodedef.h"
#include "player.h"
#include "rollback_interface.h"
#include "scripting_game.h"
#include "settings.h"
#include "tool.h"
#include "version.h"
#include "network/networkprotocol.h"
#include "network/serveropcodes.h"
#include "util/auth.h"
#include "util/base64.h"
#include "util/pointedthing.h"
#include "util/serialize.h"
#include "util/srp.h"

void Server::handleCommand_Deprecated(NetworkPacket* pkt)
{
	infostream << "Server: " << toServerCommandTable[pkt->getCommand()].name
		<< " not supported anymore" << std::endl;
}

void Server::handleCommand_Init(NetworkPacket* pkt)
{

	if(pkt->getSize() < 1)
		return;

	RemoteClient* client = getClient(pkt->getPeerId(), CS_Created);

	std::string addr_s;
	try {
		Address address = getPeerAddress(pkt->getPeerId());
		addr_s = address.serializeString();
	}
	catch (con::PeerNotFoundException &e) {
		/*
		 * no peer for this packet found
		 * most common reason is peer timeout, e.g. peer didn't
		 * respond for some time, your server was overloaded or
		 * things like that.
		 */
		infostream << "Server::ProcessData(): Canceling: peer "
				<< pkt->getPeerId() << " not found" << std::endl;
		return;
	}

	// If net_proto_version is set, this client has already been handled
	if (client->getState() > CS_Created) {
		verbosestream << "Server: Ignoring multiple TOSERVER_INITs from "
				<< addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl;
		return;
	}

	verbosestream << "Server: Got TOSERVER_INIT from " << addr_s << " (peer_id="
			<< pkt->getPeerId() << ")" << std::endl;

	// Do not allow multiple players in simple singleplayer mode.
	// This isn't a perfect way to do it, but will suffice for now
	if (m_simple_singleplayer_mode && m_clients.getClientIDs().size() > 1) {
		infostream << "Server: Not allowing another client (" << addr_s
				<< ") to connect in simple singleplayer mode" << std::endl;
		DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SINGLEPLAYER);
		return;
	}

	// First byte after command is maximum supported
	// serialization version
	u8 client_max;
	u16 supp_compr_modes;
	u16 min_net_proto_version = 0;
	u16 max_net_proto_version;
	std::string playerName;

	*pkt >> client_max >> supp_compr_modes >> min_net_proto_version
			>> max_net_proto_version >> playerName;

	u8 our_max = SER_FMT_VER_HIGHEST_READ;
	// Use the highest version supported by both
	u8 depl_serial_v = std::min(client_max, our_max);
	// If it's lower than the lowest supported, give up.
	if (depl_serial_v < SER_FMT_VER_LOWEST)
		depl_serial_v = SER_FMT_VER_INVALID;

	if (depl_serial_v == SER_FMT_VER_INVALID) {
		actionstream << "Server: A mismatched client tried to connect from "
				<< addr_s << std::endl;
		infostream<<"Server: Cannot negotiate serialization version with "
				<< addr_s << std::endl;
		DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION);
		return;
	}

	client->setPendingSerializationVersion(depl_serial_v);

	/*
		Read and check network protocol version
	*/

	u16 net_proto_version = 0;

	// Figure out a working version if it is possible at all
	if (max_net_proto_version >= SERVER_PROTOCOL_VERSION_MIN ||
			min_net_proto_version <= SERVER_PROTOCOL_VERSION_MAX) {
		// If maximum is larger than our maximum, go with our maximum
		if (max_net_proto_version > SERVER_PROTOCOL_VERSION_MAX)
			net_proto_version = SERVER_PROTOCOL_VERSION_MAX;
		// Else go with client's maximum
		else
			net_proto_version = max_net_proto_version;
	}

	verbosestream << "Server: " << addr_s << ": Protocol version: min: "
			<< min_net_proto_version << ", max: " << max_net_proto_version
			<< ", chosen: " << net_proto_version << std::endl;

	client->net_proto_version = net_proto_version;

	// On this handler at least protocol version 25 is required
	if (net_proto_version < 25 ||
			net_proto_version < SERVER_PROTOCOL_VERSION_MIN ||
			net_proto_version > SERVER_PROTOCOL_VERSION_MAX) {
		actionstream << "Server: A mismatched client tried to connect from "
				<< addr_s << std::endl;
		DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION);
		return;
	}

	if (g_settings->getBool("strict_protocol_version_checking")) {
		if (net_proto_version != LATEST_PROTOCOL_VERSION) {
			actionstream << "Server: A mismatched (strict) client tried to "
					<< "connect from " << addr_s << std::endl;
			DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION);
			return;
		}
	}

	/*
		Validate player name
	*/
	const char* playername = playerName.c_str();

	size_t pns = playerName.size();
	if (pns == 0 || pns > PLAYERNAME_SIZE) {
		actionstream << "Server: Player with "
			<< ((pns > PLAYERNAME_SIZE) ? "a too long" : "an empty")
			<< " name tried to connect from " << addr_s << std::endl;
		DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_NAME);
		return;
	}

	if (string_allowed(playerName, PLAYERNAME_ALLOWED_CHARS) == false) {
		actionstream << "Server: Player with an invalid name "
				<< "tried to connect from " << addr_s << std::endl;
		DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_CHARS_IN_NAME);
		return;
	}

	m_clients.setPlayerName(pkt->getPeerId(), playername);
	//TODO (later) case insensitivity

	std::string legacyPlayerNameCasing = playerName;

	if (!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0) {
		actionstream << "Server: Player with the name \"singleplayer\" "
				<< "tried to connect from " << addr_s << std::endl;
		DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_NAME);
		return;
	}

	{
		std::string reason;
		if (m_script->on_prejoinplayer(playername, addr_s, &reason)) {
			actionstream << "Server: Player with the name \"" << playerName << "\" "
					<< "tried to connect from " << addr_s << " "
					<< "but it was disallowed for the following reason: "
					<< reason << std::endl;
			DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_CUSTOM_STRING,
					reason.c_str());
			return;
		}
	}

	infostream << "Server: New connection: \"" << playerName << "\" from "
			<< addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl;

	// Enforce user limit.
	// Don't enforce for users that have some admin right
	if (m_clients.getClientIDs(CS_Created).size() >= g_settings->getU16("max_users") &&
			!checkPriv(playername, "server") &&
			!checkPriv(playername, "ban") &&
			!checkPriv(playername, "privs") &&
			!checkPriv(playername, "password") &&
			playername != g_settings->get("name")) {
		actionstream << "Server: " << playername << " tried to join from "
				<< addr_s << ", but there" << " are already max_users="
				<< g_settings->getU16("max_users") << " players." << std::endl;
		DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_TOO_MANY_USERS);
		return;
	}

	/*
		Compose auth methods for answer
	*/
	std::string encpwd; // encrypted Password field for the user
	bool has_auth = m_script->getAuth(playername, &encpwd, NULL);
	u32 auth_mechs = 0;

	client->chosen_mech = AUTH_MECHANISM_NONE;

	if (has_auth) {
		std::vector<std::string> pwd_components = str_split(encpwd, '#');
		if (pwd_components.size() == 4) {
			if (pwd_components[1] == "1") { // 1 means srp
				auth_mechs |= AUTH_MECHANISM_SRP;
				client->enc_pwd = encpwd;
			} else {
				actionstream << "User " << playername
					<< " tried to log in, but password field"
					<< " was invalid (unknown mechcode)." << std::endl;
				DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
				return;
			}
		} else if (base64_is_valid(encpwd)) {
			auth_mechs |= AUTH_MECHANISM_LEGACY_PASSWORD;
			client->enc_pwd = encpwd;
		} else {
			actionstream << "User " << playername
				<< " tried to log in, but password field"
				<< " was invalid (invalid base64)." << std::endl;
			DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
			return;
		}
	} else {
		std::string default_password = g_settings->get("default_password");
		if (default_password.length() == 0) {
			auth_mechs |= AUTH_MECHANISM_FIRST_SRP;
		} else {
			// Take care of default passwords.
			client->enc_pwd = getSRPVerifier(playerName, default_password);
			auth_mechs |= AUTH_MECHANISM_SRP;
			// Create auth, but only on successful login
			client->create_player_on_auth_success = true;
		}
	}

	/*
		Answer with a TOCLIENT_HELLO
	*/

	verbosestream << "Sending TOCLIENT_HELLO with auth method field: "
		<< auth_mechs << std::endl;

	NetworkPacket resp_pkt(TOCLIENT_HELLO, 1 + 4
		+ legacyPlayerNameCasing.size(), pkt->getPeerId());

	u16 depl_compress_mode = NETPROTO_COMPRESSION_NONE;
	resp_pkt << depl_serial_v << depl_compress_mode << net_proto_version
		<< auth_mechs << legacyPlayerNameCasing;

	Send(&resp_pkt);

	client->allowed_auth_mechs = auth_mechs;
	client->setDeployedCompressionMode(depl_compress_mode);

	m_clients.event(pkt->getPeerId(), CSE_Hello);
}

void Server::handleCommand_Init_Legacy(NetworkPacket* pkt)
{
	// [0] u8 SER_FMT_VER_HIGHEST_READ
	// [1] u8[20] player_name
	// [21] u8[28] password <--- can be sent without this, from old versions

	if (pkt->getSize() < 1+PLAYERNAME_SIZE)
		return;

	RemoteClient* client = getClient(pkt->getPeerId(), CS_Created);

	std::string addr_s;
	try {
		Address address = getPeerAddress(pkt->getPeerId());
		addr_s = address.serializeString();
	}
	catch (con::PeerNotFoundException &e) {
		/*
		 * no peer for this packet found
		 * most common reason is peer timeout, e.g. peer didn't
		 * respond for some time, your server was overloaded or
		 * things like that.
		 */
		infostream << "Server::ProcessData(): Canceling: peer "
				<< pkt->getPeerId() << " not found" << std::endl;
		return;
	}

	// If net_proto_version is set, this client has already been handled
	if (client->getState() > CS_Created) {
		verbosestream << "Server: Ignoring multiple TOSERVER_INITs from "
				<< addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl;
		return;
	}

	verbosestream << "Server: Got TOSERVER_INIT_LEGACY from " << addr_s << " (peer_id="
			<< pkt->getPeerId() << ")" << std::endl;

	// Do not allow multiple players in simple singleplayer mode.
	// This isn't a perfect way to do it, but will suffice for now
	if (m_simple_singleplayer_mode && m_clients.getClientIDs().size() > 1) {
		infostream << "Server: Not allowing another client (" << addr_s
				<< ") to connect in simple singleplayer mode" << std::endl;
		DenyAccess_Legacy(pkt->getPeerId(), L"Running in simple singleplayer mode.");
		return;
	}

	// First byte after command is maximum supported
	// serialization version
	u8 client_max;

	*pkt >> client_max;

	u8 our_max = SER_FMT_VER_HIGHEST_READ;
	// Use the highest version supported by both
	int deployed = std::min(client_max, our_max);
	// If it's lower than the lowest supported, give up.
	if (deployed < SER_FMT_VER_LOWEST)
		deployed = SER_FMT_VER_INVALID;

	if (deployed == SER_FMT_VER_INVALID) {
		actionstream << "Server: A mismatched client tried to connect from "
				<< addr_s << std::endl;
		infostream<<"Server: Cannot negotiate serialization version with "
				<< addr_s << std::endl;
		DenyAccess_Legacy(pkt->getPeerId(), std::wstring(
				L"Your client's version is not supported.\n"
				L"Server version is ")
				+ utf8_to_wide(g_version_string) + L"."
		);
		return;
	}

	client->setPendingSerializationVersion(deployed);

	/*
		Read and check network protocol version
	*/

	u16 min_net_proto_version = 0;
	if (pkt->getSize() >= 1 + PLAYERNAME_SIZE + PASSWORD_SIZE + 2)
		min_net_proto_version = pkt->getU16(1 + PLAYERNAME_SIZE + PASSWORD_SIZE);

	// Use same version as minimum and maximum if maximum version field
	// doesn't exist (backwards compatibility)
	u16 max_net_proto_version = min_net_proto_version;
	if (pkt->getSize() >= 1 + PLAYERNAME_SIZE + PASSWORD_SIZE + 2 + 2)
		max_net_proto_version = pkt->getU16(1 + PLAYERNAME_SIZE + PASSWORD_SIZE + 2);

	// Start with client's maximum version
	u16 net_proto_version = max_net_proto_version;

	// Figure out a working version if it is possible at all
	if (max_net_proto_version >= SERVER_PROTOCOL_VERSION_MIN ||
			min_net_proto_version <= SERVER_PROTOCOL_VERSION_MAX) {
		// If maximum is larger than our maximum, go with our maximum
		if (max_net_proto_version > SERVER_PROTOCOL_VERSION_MAX)
			net_proto_version = SERVER_PROTOCOL_VERSION_MAX;
		// Else go with client's maximum
		else
			net_proto_version = max_net_proto_version;
	}

	// The client will send up to date init packet, ignore this one
	if (net_proto_version >= 25)
		return;

	verbosestream << "Server: " << addr_s << ": Protocol version: min: "
			<< min_net_proto_version << ", max: " << max_net_proto_version
			<< ", chosen: " << net_proto_version << std::endl;

	client->net_proto_version = net_proto_version;

	if (net_proto_version < SERVER_PROTOCOL_VERSION_MIN ||
			net_proto_version > SERVER_PROTOCOL_VERSION_MAX) {
		actionstream << "Server: A mismatched client tried to connect from "
				<< addr_s << std::endl;
		DenyAccess_Legacy(pkt->getPeerId(), std::wstring(
				L"Your client's version is not supported.\n"
				L"Server version is ")
				+ utf8_to_wide(g_version_string) + L",\n"
				+ L"server's PROTOCOL_VERSION is "
				+ utf8_to_wide(itos(SERVER_PROTOCOL_VERSION_MIN))
				+ L"..."
				+ utf8_to_wide(itos(SERVER_PROTOCOL_VERSION_MAX))
				+ L", client's PROTOCOL_VERSION is "
				+ utf8_to_wide(itos(min_net_proto_version))
				+ L"..."
				+ utf8_to_wide(itos(max_net_proto_version))
		);
		return;
	}

	if (g_settings->getBool("strict_protocol_version_checking")) {
		if (net_proto_version != LATEST_PROTOCOL_VERSION) {
			actionstream << "Server: A mismatched (strict) client tried to "
					<< "connect from " << addr_s << std::endl;
			DenyAccess_Legacy(pkt->getPeerId(), std::wstring(
					L"Your client's version is not supported.\n"
					L"Server version is ")
					+ utf8_to_wide(g_version_string) + L",\n"
					+ L"server's PROTOCOL_VERSION (strict) is "
					+ utf8_to_wide(itos(LATEST_PROTOCOL_VERSION))
					+ L", client's PROTOCOL_VERSION is "
					+ utf8_to_wide(itos(min_net_proto_version))
					+ L"..."
					+ utf8_to_wide(itos(max_net_proto_version))
			);
			return;
		}
	}

	/*
		Set up player
	*/
	char playername[PLAYERNAME_SIZE];
	unsigned int playername_length = 0;
	for (; playername_length < PLAYERNAME_SIZE; playername_length++ ) {
		playername[playername_length] = pkt->getChar(1+playername_length);
		if (pkt->getChar(1+playername_length) == 0)
			break;
	}

	if (playername_length == PLAYERNAME_SIZE) {
		actionstream << "Server: Player with name exceeding max length "
				<< "tried to connect from " << addr_s << std::endl;
		DenyAccess_Legacy(pkt->getPeerId(), L"Name too long");
		return;
	}


	if (playername[0]=='\0') {
		actionstream << "Server: Player with an empty name "
				<< "tried to connect from " << addr_s << std::endl;
		DenyAccess_Legacy(pkt->getPeerId(), L"Empty name");
		return;
	}

	if (string_allowed(playername, PLAYERNAME_ALLOWED_CHARS) == false) {
		actionstream << "Server: Player with an invalid name "
				<< "tried to connect from " << addr_s << std::endl;
		DenyAccess_Legacy(pkt->getPeerId(), L"Name contains unallowed characters");
		return;
	}

	if (!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0) {
		actionstream << "Server: Player with the name \"singleplayer\" "
				<< "tried to connect from " << addr_s << std::endl;
		DenyAccess_Legacy(pkt->getPeerId(), L"Name is not allowed");
		return;
	}

	{
		std::string reason;
		if (m_script->on_prejoinplayer(playername, addr_s, &reason)) {
			actionstream << "Server: Player with the name \"" << playername << "\" "
					<< "tried to connect from " << addr_s << " "
					<< "but it was disallowed for the following reason: "
					<< reason << std::endl;
			DenyAccess_Legacy(pkt->getPeerId(), utf8_to_wide(reason.c_str()));
			return;
		}
	}

	infostream<<"Server: New connection: \""<<playername<<"\" from "
			<<addr_s<<" (peer_id="<<pkt->getPeerId()<<")"<<std::endl;

	// Get password
	char given_password[PASSWORD_SIZE];
	if (pkt->getSize() < 1 + PLAYERNAME_SIZE + PASSWORD_SIZE) {
		// old version - assume blank password
		given_password[0] = 0;
	}
	else {
		for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
			given_password[i] = pkt->getChar(21 + i);
		}
		given_password[PASSWORD_SIZE - 1] = 0;
	}

	if (!base64_is_valid(given_password)) {
		actionstream << "Server: " << playername
				<< " supplied invalid password hash" << std::endl;
		DenyAccess_Legacy(pkt->getPeerId(), L"Invalid password hash");
		return;
	}

	// Enforce user limit.
	// Don't enforce for users that have some admin right
	if (m_clients.getClientIDs(CS_Created).size() >= g_settings->getU16("max_users") &&
			!checkPriv(playername, "server") &&
			!checkPriv(playername, "ban") &&
			!checkPriv(playername, "privs") &&
			!checkPriv(playername, "password") &&
			playername != g_settings->get("name")) {
		actionstream << "Server: " << playername << " tried to join, but there"
				<< " are already max_users="
				<< g_settings->getU16("max_users") << " players." << std::endl;
		DenyAccess_Legacy(pkt->getPeerId(), L"Too many users.");
		return;
	}

	std::string checkpwd; // Password hash to check against
	bool has_auth = m_script->getAuth(playername, &checkpwd, NULL);

	// If no authentication info exists for user, create it
	if (!has_auth) {
		if (!isSingleplayer() &&
				g_settings->getBool("disallow_empty_password") &&
				std::string(given_password) == "") {
			actionstream << "Server: " << playername
					<< " supplied empty password" << std::endl;
			DenyAccess_Legacy(pkt->getPeerId(), L"Empty passwords are "
					L"disallowed. Set a password and try again.");
			return;
		}
		std::string raw_default_password =
			g_settings->get("default_password");
		std::string initial_password =
			translatePassword(playername, raw_default_password);

		// If default_password is empty, allow any initial password
		if (raw_default_password.length() == 0)
			initial_password = given_password;

		m_script->createAuth(playername, initial_password);
	}

	has_auth = m_script->getAuth(playername, &checkpwd, NULL);

	if (!has_auth) {
		actionstream << "Server: " << playername << " cannot be authenticated"
				<< " (auth handler does not work?)" << std::endl;
		DenyAccess_Legacy(pkt->getPeerId(), L"Not allowed to login");
		return;
	}

	if (given_password != checkpwd) {
		actionstream << "Server: " << playername << " supplied wrong password"
				<< std::endl;
		DenyAccess_Legacy(pkt->getPeerId(), L"Wrong password");
		return;
	}

	RemotePlayer *player =
			static_cast<RemotePlayer*>(m_env->getPlayer(playername));

	if (player && player->peer_id != 0) {
		actionstream << "Server: " << playername << ": Failed to emerge player"
				<< " (player allocated to an another client)" << std::endl;
		DenyAccess_Legacy(pkt->getPeerId(), L"Another client is connected with this "
				L"name. If your client closed unexpectedly, try again in "
				L"a minute.");
	}

	m_clients.setPlayerName(pkt->getPeerId(), playername);

	/*
		Answer with a TOCLIENT_INIT
	*/

	NetworkPacket resp_pkt(TOCLIENT_INIT_LEGACY, 1 + 6 + 8 + 4,
			pkt->getPeerId());

	resp_pkt << (u8) deployed << (v3s16) floatToInt(v3f(0,0,0), BS)
			<< (u64) m_env->getServerMap().getSeed()
			<< g_settings->getFloat("dedicated_server_step");