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minetest/src/network/serverpackethandler.cpp

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/*
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 "chatmessage.h"
#include "server.h"
#include "log.h"
#include "emerge.h"
#include "mapblock.h"
#include "modchannels.h"
#include "nodedef.h"
#include "remoteplayer.h"
#include "rollback_interface.h"
#include "scripting_server.h"
#include "settings.h"
#include "tool.h"
#include "version.h"
#include "network/connection.h"
#include "network/networkprotocol.h"
#include "network/serveropcodes.h"
#include "server/player_sao.h"
#include "server/serverinventorymgr.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;
session_t peer_id = pkt->getPeerId();
RemoteClient *client = getClient(peer_id, CS_Created);
std::string addr_s;
try {
Address address = getPeerAddress(peer_id);
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 " << peer_id <<
" 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=" << peer_id << ")" << std::endl;
return;
}
verbosestream << "Server: Got TOSERVER_INIT from " << addr_s <<
" (peer_id=" << peer_id << ")" << 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(peer_id, 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_READ)
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 << " ser_fmt_max=" << (int)client_max << std::endl;
DenyAccess(peer_id, 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;
if ((g_settings->getBool("strict_protocol_version_checking") &&
net_proto_version != LATEST_PROTOCOL_VERSION) ||
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 << " proto_max=" << (int)max_net_proto_version << std::endl;
DenyAccess(peer_id, 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(peer_id, SERVER_ACCESSDENIED_WRONG_NAME);
return;
}
if (!string_allowed(playerName, PLAYERNAME_ALLOWED_CHARS)) {
actionstream << "Server: Player with an invalid name tried to connect "
"from " << addr_s << std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_CHARS_IN_NAME);
return;
}
m_clients.setPlayerName(peer_id, 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(peer_id, 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(peer_id, SERVER_ACCESSDENIED_CUSTOM_STRING, reason);
return;
}
}
infostream << "Server: New connection: \"" << playerName << "\" from " <<
addr_s << " (peer_id=" << peer_id << ")" << std::endl;
// Enforce user limit.
// Don't enforce for users that have some admin right or mod permits it.
if (m_clients.isUserLimitReached() &&
playername != g_settings->get("name") &&
!m_script->can_bypass_userlimit(playername, addr_s)) {
actionstream << "Server: " << playername << " tried to join from " <<
addr_s << ", but there are already max_users=" <<
g_settings->getU16("max_users") << " players." << std::endl;
DenyAccess(peer_id, 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(peer_id, 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(peer_id, 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 = get_encoded_srp_verifier(playerName, default_password);
auth_mechs |= AUTH_MECHANISM_SRP;
// Allocate player in db, 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(), peer_id);
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(peer_id, CSE_Hello);
}
void Server::handleCommand_Init2(NetworkPacket* pkt)
{
session_t peer_id = pkt->getPeerId();
verbosestream << "Server: Got TOSERVER_INIT2 from " << peer_id << std::endl;
m_clients.event(peer_id, CSE_GotInit2);
u16 protocol_version = m_clients.getProtocolVersion(peer_id);
std::string lang;
if (pkt->getSize() > 0)
*pkt >> lang;
/*
Send some initialization data
*/
infostream << "Server: Sending content to " << getPlayerName(peer_id) <<
std::endl;
// Send item definitions
SendItemDef(peer_id, m_itemdef, protocol_version);
// Send node definitions
SendNodeDef(peer_id, m_nodedef, protocol_version);
m_clients.event(peer_id, CSE_SetDefinitionsSent);
// Send media announcement
sendMediaAnnouncement(peer_id, lang);
RemoteClient *client = getClient(peer_id, CS_InitDone);
// Keep client language for server translations
client->setLangCode(lang);
// Send active objects
{
PlayerSAO *sao = getPlayerSAO(peer_id);
if (client && sao)
SendActiveObjectRemoveAdd(client, sao);
}
// Send detached inventories
sendDetachedInventories(peer_id, false);
// Send player movement settings
SendMovement(peer_id);
// Send time of day
u16 time = m_env->getTimeOfDay();
float time_speed = g_settings->getFloat("time_speed");
SendTimeOfDay(peer_id, time, time_speed);
SendCSMRestrictionFlags(peer_id);
// Warnings about protocol version can be issued here
if (client->net_proto_version < LATEST_PROTOCOL_VERSION) {
SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
L"# Server: WARNING: YOUR CLIENT'S VERSION MAY NOT BE FULLY COMPATIBLE "
L"WITH THIS SERVER!"));
}
}
void Server::handleCommand_RequestMedia(NetworkPacket* pkt)
{
std::vector<std::string> tosend;
u16 numfiles;
*pkt >> numfiles;
session_t peer_id = pkt->getPeerId();
infostream << "Sending " << numfiles << " files to " <<
getPlayerName(peer_id) << std::endl;
verbosestream << "TOSERVER_REQUEST_MEDIA: " << std::endl;
for (u16 i = 0; i < numfiles; i++) {
std::string name;
*pkt >> name;
tosend.push_back(name);
verbosestream << "TOSERVER_REQUEST_MEDIA: requested file "
<< name << std::endl;
}
sendRequestedMedia(peer_id, tosend);
}
void Server::handleCommand_ClientReady(NetworkPacket* pkt)
{
session_t peer_id = pkt->getPeerId();
PlayerSAO* playersao = StageTwoClientInit(peer_id);
if (playersao == NULL) {
errorstream << "TOSERVER_CLIENT_READY stage 2 client init failed "
"peer_id=" << peer_id << std::endl;
DisconnectPeer(peer_id);
return;
}
if (pkt->getSize() < 8) {
errorstream << "TOSERVER_CLIENT_READY client sent inconsistent data, "
"disconnecting peer_id: " << peer_id << std::endl;
DisconnectPeer(peer_id);
return;
}
u8 major_ver, minor_ver, patch_ver, reserved;
std::string full_ver;
*pkt >> major_ver >> minor_ver >> patch_ver >> reserved >> full_ver;
m_clients.setClientVersion(peer_id, major_ver, minor_ver, patch_ver,
full_ver);
if (pkt->getRemainingBytes() >= 2)
*pkt >> playersao->getPlayer()->formspec_version;
const std::vector<std::string> &players = m_clients.getPlayerNames();
NetworkPacket list_pkt(TOCLIENT_UPDATE_PLAYER_LIST, 0, peer_id);
list_pkt << (u8) PLAYER_LIST_INIT << (u16) players.size();
for (const std::string &player: players) {
list_pkt << player;
}
m_clients.send(peer_id, 0, &list_pkt, true);
NetworkPacket notice_pkt(TOCLIENT_UPDATE_PLAYER_LIST, 0, PEER_ID_INEXISTENT);
// (u16) 1 + std::string represents a pseudo vector serialization representation
notice_pkt << (u8) PLAYER_LIST_ADD << (u16) 1 << std::string(playersao->getPlayer()->getName());
m_clients.sendToAll(&notice_pkt);
m_clients.event(peer_id, CSE_SetClientReady);
s64 last_login;
m_script->getAuth(playersao->getPlayer()->getName(), nullptr, nullptr, &last_login);
m_script->on_joinplayer(playersao, last_login);
// Send shutdown timer if shutdown has been scheduled
if (m_shutdown_state.isTimerRunning()) {
SendChatMessage(peer_id, m_shutdown_state.getShutdownTimerMessage());
}
}
void Server::handleCommand_GotBlocks(NetworkPacket* pkt)
{
if (pkt->getSize() < 1)
return;
/*
[0] u16 command
[2] u8 count
[3] v3s16 pos_0
[3+6] v3s16 pos_1
...
*/
u8 count;
*pkt >> count;
RemoteClient *client = getClient(pkt->getPeerId());
if ((s16)pkt->getSize() < 1 + (int)count * 6) {
throw con::InvalidIncomingDataException
("GOTBLOCKS length is too short");
}
for (u16 i = 0; i < count; i++) {
v3s16 p;
*pkt >> p;
client->GotBlock(p);
}
}
void Server::process_PlayerPos(RemotePlayer *player, PlayerSAO *playersao,
NetworkPacket *pkt)
{
if (pkt->getRemainingBytes() < 12 + 12 + 4 + 4 + 4 + 1 + 1)
return;
v3s32 ps, ss;
s32 f32pitch, f32yaw;
u8 f32fov;
*pkt >> ps;
*pkt >> ss;
*pkt >> f32pitch;
*pkt >> f32yaw;
f32 pitch = (f32)f32pitch / 100.0f;
f32 yaw = (f32)f32yaw / 100.0f;
u32 keyPressed = 0;
// default behavior (in case an old client doesn't send these)
f32 fov = 0;
u8 wanted_range = 0;
*pkt >> keyPressed;
*pkt >> f32fov;
fov = (f32)f32fov / 80.0f;
*pkt >> wanted_range;
v3f position((f32)ps.X / 100.0f, (f32)ps.Y / 100.0f, (f32)ps.Z / 100.0f);
v3f speed((f32)ss.X / 100.0f, (f32)ss.Y / 100.0f, (f32)ss.Z / 100.0f);
pitch = modulo360f(pitch);
yaw = wrapDegrees_0_360(yaw);
playersao->setBasePosition(position);
player->setSpeed(speed);
playersao->setLookPitch(pitch);
playersao->setPlayerYaw(yaw);
playersao->setFov(fov);
playersao->setWantedRange(wanted_range);
player->keyPressed = keyPressed;
player->control.up = (keyPressed & 1);
player->control.down = (keyPressed & 2);
player->control.left = (keyPressed & 4);
player->control.right = (keyPressed & 8);
player->control.jump = (keyPressed & 16);
player->control.aux1 = (keyPressed & 32);
player->control.sneak = (keyPressed & 64);
player->control.LMB = (keyPressed & 128);
player->control.RMB = (keyPressed & 256);
if (playersao->checkMovementCheat()) {
// Call callbacks
m_script->on_cheat(playersao, "moved_too_fast");
SendMovePlayer(pkt->getPeerId());
}
}
void Server::handleCommand_PlayerPos(NetworkPacket* pkt)
{
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
PlayerSAO *playersao = player->getPlayerSAO();
if (playersao == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player object for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
// If player is dead we don't care of this packet
if (playersao->isDead()) {
verbosestream << "TOSERVER_PLAYERPOS: " << player->getName()
<< " is dead. Ignoring packet";
return;
}
process_PlayerPos(player, playersao, pkt);
}
void Server::handleCommand_DeletedBlocks(NetworkPacket* pkt)
{
if (pkt->getSize() < 1)
return;
/*
[0] u16 command
[2] u8 count
[3] v3s16 pos_0
[3+6] v3s16 pos_1
...
*/
u8 count;
*pkt >> count;
RemoteClient *client = getClient(pkt->getPeerId());
if ((s16)pkt->getSize() < 1 + (int)count * 6) {
throw con::InvalidIncomingDataException
("DELETEDBLOCKS length is too short");
}
for (u16 i = 0; i < count; i++) {
v3s16 p;
*pkt >> p;
client->SetBlockNotSent(p);
}
}
void Server::handleCommand_InventoryAction(NetworkPacket* pkt)
{
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
PlayerSAO *playersao = player->getPlayerSAO();
if (playersao == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player object for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
// Strip command and create a stream
std::string datastring(pkt->getString(0), pkt->getSize());
verbosestream << "TOSERVER_INVENTORY_ACTION: data=" << datastring
<< std::endl;
std::istringstream is(datastring, std::ios_base::binary);
// Create an action
InventoryAction *a = InventoryAction::deSerialize(is);
if (!a) {
infostream << "TOSERVER_INVENTORY_ACTION: "
<< "InventoryAction::deSerialize() returned NULL"
<< std::endl;
return;
}
// If something goes wrong, this player is to blame
RollbackScopeActor rollback_scope(m_rollback,
std::string("player:")+player->getName());
/*
Note: Always set inventory not sent, to repair cases
where the client made a bad prediction.
*/
/*
Handle restrictions and special cases of the move action
*/
if (a->getType() == IAction::Move) {
IMoveAction *ma = (IMoveAction*)a;
ma->from_inv.applyCurrentPlayer(player->getName());
ma->to_inv.applyCurrentPlayer(player->getName());
m_inventory_mgr->setInventoryModified(ma->from_inv);
if (ma->from_inv != ma->to_inv)
m_inventory_mgr->setInventoryModified(ma->to_inv);
bool from_inv_is_current_player =
(ma->from_inv.type == InventoryLocation::PLAYER) &&
(ma->from_inv.name == player->getName());
bool to_inv_is_current_player =
(ma->to_inv.type == InventoryLocation::PLAYER) &&
(ma->to_inv.name == player->getName());
InventoryLocation *remote = from_inv_is_current_player ?
&ma->to_inv : &ma->from_inv;
// Check for out-of-range interaction
if (remote->type == InventoryLocation::NODEMETA) {
v3f node_pos = intToFloat(remote->p, BS);
v3f player_pos = player->getPlayerSAO()->getEyePosition();
f32 d = player_pos.getDistanceFrom(node_pos);
if (!checkInteractDistance(player, d, "inventory"))
return;
}
/*
Disable moving items out of craftpreview
*/
if (ma->from_list == "craftpreview") {
infostream << "Ignoring IMoveAction from "
<< (ma->from_inv.dump()) << ":" << ma->from_list
<< " to " << (ma->to_inv.dump()) << ":" << ma->to_list
<< " because src is " << ma->from_list << std::endl;
delete a;
return;
}
/*
Disable moving items into craftresult and craftpreview
*/
if (ma->to_list == "craftpreview" || ma->to_list == "craftresult") {
infostream << "Ignoring IMoveAction from "
<< (ma->from_inv.dump()) << ":" << ma->from_list
<< " to " << (ma->to_inv.dump()) << ":" << ma->to_list
<< " because dst is " << ma->to_list << std::endl;
delete a;
return;
}
// Disallow moving items in elsewhere than player's inventory
// if not allowed to interact
if (!checkPriv(player->getName(), "interact") &&
(!from_inv_is_current_player ||
!to_inv_is_current_player)) {
infostream << "Cannot move outside of player's inventory: "
<< "No interact privilege" << std::endl;
delete a;
return;
}
}
/*
Handle restrictions and special cases of the drop action
*/
else if (a->getType() == IAction::Drop) {
IDropAction *da = (IDropAction*)a;
da->from_inv.applyCurrentPlayer(player->getName());
m_inventory_mgr->setInventoryModified(da->from_inv);
/*
Disable dropping items out of craftpreview
*/
if (da->from_list == "craftpreview") {
infostream << "Ignoring IDropAction from "
<< (da->from_inv.dump()) << ":" << da->from_list
<< " because src is " << da->from_list << std::endl;
delete a;
return;
}
// Disallow dropping items if not allowed to interact
if (!checkPriv(player->getName(), "interact")) {
delete a;
return;
}
// Disallow dropping items if dead
if (playersao->isDead()) {
infostream << "Ignoring IDropAction from "
<< (da->from_inv.dump()) << ":" << da->from_list
<< " because player is dead." << std::endl;
delete a;
return;
}
}
/*
Handle restrictions and special cases of the craft action
*/
else if (a->getType() == IAction::Craft) {
ICraftAction *ca = (ICraftAction*)a;
ca->craft_inv.applyCurrentPlayer(player->getName());
m_inventory_mgr->setInventoryModified(ca->craft_inv);
//bool craft_inv_is_current_player =
// (ca->craft_inv.type == InventoryLocation::PLAYER) &&
// (ca->craft_inv.name == player->getName());
// Disallow crafting if not allowed to interact
if (!checkPriv(player->getName(), "interact")) {
infostream << "Cannot craft: "
<< "No interact privilege" << std::endl;
delete a;
return;
}
}
// Do the action
a->apply(m_inventory_mgr.get(), playersao, this);
// Eat the action
delete a;
}
void Server::handleCommand_ChatMessage(NetworkPacket* pkt)
{
/*
u16 command
u16 length
wstring message
*/
u16 len;
*pkt >> len;
std::wstring message;
for (u16 i = 0; i < len; i++) {
u16 tmp_wchar;
*pkt >> tmp_wchar;
message += (wchar_t)tmp_wchar;
}
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
// Get player name of this client
std::string name = player->getName();
std::wstring wname = narrow_to_wide(name);
std::wstring answer_to_sender = handleChat(name, wname, message, true, player);
if (!answer_to_sender.empty()) {
// Send the answer to sender
SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_NORMAL,
answer_to_sender, wname));
}
}
void Server::handleCommand_Damage(NetworkPacket* pkt)
{
u16 damage;
*pkt >> damage;
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
PlayerSAO *playersao = player->getPlayerSAO();
if (playersao == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player object for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
if (!playersao->isImmortal()) {
if (playersao->isDead()) {
verbosestream << "Server::ProcessData(): Info: "
"Ignoring damage as player " << player->getName()
<< " is already dead." << std::endl;
return;
}
actionstream << player->getName() << " damaged by "
<< (int)damage << " hp at " << PP(playersao->getBasePosition() / BS)
<< std::endl;
PlayerHPChangeReason reason(PlayerHPChangeReason::FALL);
playersao->setHP((s32)playersao->getHP() - (s32)damage, reason);
SendPlayerHPOrDie(playersao, reason);
}
}
void Server::handleCommand_PlayerItem(NetworkPacket* pkt)
{
if (pkt->getSize() < 2)
return;
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
PlayerSAO *playersao = player->getPlayerSAO();
if (playersao == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player object for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
u16 item;
*pkt >> item;
playersao->getPlayer()->setWieldIndex(item);
}
void Server::handleCommand_Respawn(NetworkPacket* pkt)
{
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
PlayerSAO *playersao = player->getPlayerSAO();
assert(playersao);
if (!playersao->isDead())
return;
RespawnPlayer(peer_id);
actionstream << player->getName() << " respawns at "
<< PP(playersao->getBasePosition() / BS) << std::endl;
// ActiveObject is added to environment in AsyncRunStep after
// the previous addition has been successfully removed
}
bool Server::checkInteractDistance(RemotePlayer *player, const f32 d, const std::string &what)
{
ItemStack selected_item, hand_item;
player->getWieldedItem(&selected_item, &hand_item);
f32 max_d = BS * getToolRange(selected_item.getDefinition(m_itemdef),
hand_item.getDefinition(m_itemdef));
// Cube diagonal * 1.5 for maximal supported node extents:
// sqrt(3) * 1.5 ≅ 2.6
if (d > max_d + 2.6f * BS) {
actionstream << "Player " << player->getName()
<< " tried to access " << what
<< " from too far: "
<< "d=" << d << ", max_d=" << max_d
<< "; ignoring." << std::endl;
// Call callbacks
m_script->on_cheat(player->getPlayerSAO(), "interacted_too_far");
return false;
}
return true;
}
void Server::handleCommand_Interact(NetworkPacket *pkt)
{
/*
[0] u16 command
[2] u8 action
[3] u16 item
[5] u32 length of the next item (plen)
[9] serialized PointedThing
[9 + plen] player position information
*/
InteractAction action;
u16 item_i;
*pkt >> (u8 &)action;
*pkt >> item_i;
std::istringstream tmp_is(pkt->readLongString(), std::ios::binary);
PointedThing pointed;
pointed.deSerialize(tmp_is);
verbosestream << "TOSERVER_INTERACT: action=" << (int)action << ", item="
<< item_i << ", pointed=" << pointed.dump() << std::endl;
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
PlayerSAO *playersao = player->getPlayerSAO();
if (playersao == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player object for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
if (playersao->isDead()) {
actionstream << "Server: " << player->getName()
<< " tried to interact while dead; ignoring." << std::endl;
if (pointed.type == POINTEDTHING_NODE) {
// Re-send block to revert change on client-side
RemoteClient *client = getClient(peer_id);
v3s16 blockpos = getNodeBlockPos(pointed.node_undersurface);
client->SetBlockNotSent(blockpos);
}
// Call callbacks
m_script->on_cheat(playersao, "interacted_while_dead");
return;
}
process_PlayerPos(player, playersao, pkt);
v3f player_pos = playersao->getLastGoodPosition();
// Update wielded item
playersao->getPlayer()->setWieldIndex(item_i);
// Get pointed to node (undefined if not POINTEDTYPE_NODE)
v3s16 p_under = pointed.node_undersurface;
v3s16 p_above = pointed.node_abovesurface;
// Get pointed to object (NULL if not POINTEDTYPE_OBJECT)
ServerActiveObject *pointed_object = NULL;
if (pointed.type == POINTEDTHING_OBJECT) {
pointed_object = m_env->getActiveObject(pointed.object_id);
if (pointed_object == NULL) {
verbosestream << "TOSERVER_INTERACT: "
"pointed object is NULL" << std::endl;
return;
}
}
v3f pointed_pos_under = player_pos;
v3f pointed_pos_above = player_pos;
if (pointed.type == POINTEDTHING_NODE) {
pointed_pos_under = intToFloat(p_under, BS);
pointed_pos_above = intToFloat(p_above, BS);
}
else if (pointed.type == POINTEDTHING_OBJECT) {
pointed_pos_under = pointed_object->getBasePosition();
pointed_pos_above = pointed_pos_under;
}
/*
Make sure the player is allowed to do it
*/
if (!checkPriv(player->getName(), "interact")) {
actionstream << player->getName() << " attempted to interact with " <<
pointed.dump() << " without 'interact' privilege" << std::endl;
// Re-send block to revert change on client-side
RemoteClient *client = getClient(peer_id);
// Digging completed -> under
if (action == INTERACT_DIGGING_COMPLETED) {
v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
client->SetBlockNotSent(blockpos);
}
// Placement -> above
else if (action == INTERACT_PLACE) {
v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
client->SetBlockNotSent(blockpos);
}
return;
}
/*
Check that target is reasonably close
(only when digging or placing things)
*/
static thread_local const bool enable_anticheat =
!g_settings->getBool("disable_anticheat");
if ((action == INTERACT_START_DIGGING || action == INTERACT_DIGGING_COMPLETED ||
action == INTERACT_PLACE || action == INTERACT_USE) &&
enable_anticheat && !isSingleplayer()) {
float d = playersao->getEyePosition().getDistanceFrom(pointed_pos_under);
if (!checkInteractDistance(player, d, pointed.dump())) {
// Re-send block to revert change on client-side
RemoteClient *client = getClient(peer_id);
v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
client->SetBlockNotSent(blockpos);
return;
}
}
/*
If something goes wrong, this player is to blame
*/
RollbackScopeActor rollback_scope(m_rollback,
std::string("player:")+player->getName());
/*
0: start digging or punch object
*/
if (action == INTERACT_START_DIGGING) {
if (pointed.type == POINTEDTHING_NODE) {
MapNode n(CONTENT_IGNORE);
bool pos_ok;
n = m_env->getMap().getNode(p_under, &pos_ok);
if (!pos_ok) {
infostream << "Server: Not punching: Node not found. "
"Adding block to emerge queue." << std::endl;
m_emerge->enqueueBlockEmerge(peer_id, getNodeBlockPos(p_above),
false);
}
if (n.getContent() != CONTENT_IGNORE)
m_script->node_on_punch(p_under, n, playersao, pointed);
// Cheat prevention
playersao->noCheatDigStart(p_under);
}
else if (pointed.type == POINTEDTHING_OBJECT) {
// Skip if object can't be interacted with anymore
if (pointed_object->isGone())
return;
ItemStack selected_item, hand_item;
ItemStack tool_item = playersao->getWieldedItem(&selected_item, &hand_item);
ToolCapabilities toolcap =
tool_item.getToolCapabilities(m_itemdef);
v3f dir = (pointed_object->getBasePosition() -
(playersao->getBasePosition() + playersao->getEyeOffset())
).normalize();
float time_from_last_punch =
playersao->resetTimeFromLastPunch();
u16 src_original_hp = pointed_object->getHP();
u16 dst_origin_hp = playersao->getHP();
u16 wear = pointed_object->punch(dir, &toolcap, playersao,
time_from_last_punch);
// Callback may have changed item, so get it again
playersao->getWieldedItem(&selected_item);
bool changed = selected_item.addWear(wear, m_itemdef);
if (changed)
playersao->setWieldedItem(selected_item);
// If the object is a player and its HP changed
if (src_original_hp != pointed_object->getHP() &&
pointed_object->getType() == ACTIVEOBJECT_TYPE_PLAYER) {
SendPlayerHPOrDie((PlayerSAO *)pointed_object,
PlayerHPChangeReason(PlayerHPChangeReason::PLAYER_PUNCH, playersao));
}
// If the puncher is a player and its HP changed
if (dst_origin_hp != playersao->getHP())
SendPlayerHPOrDie(playersao,
PlayerHPChangeReason(PlayerHPChangeReason::PLAYER_PUNCH, pointed_object));
}
} // action == INTERACT_START_DIGGING
/*
1: stop digging
*/
else if (action == INTERACT_STOP_DIGGING) {
} // action == INTERACT_STOP_DIGGING
/*
2: Digging completed
*/
else if (action == INTERACT_DIGGING_COMPLETED) {
// Only digging of nodes
if (pointed.type == POINTEDTHING_NODE) {
bool pos_ok;
MapNode n = m_env->getMap().getNode(p_under, &pos_ok);
if (!pos_ok) {
infostream << "Server: Not finishing digging: Node not found. "
"Adding block to emerge queue." << std::endl;
m_emerge->enqueueBlockEmerge(peer_id, getNodeBlockPos(p_above),
false);
}
/* Cheat prevention */
bool is_valid_dig = true;
if (enable_anticheat && !isSingleplayer()) {
v3s16 nocheat_p = playersao->getNoCheatDigPos();
float nocheat_t = playersao->getNoCheatDigTime();
playersao->noCheatDigEnd();
// If player didn't start digging this, ignore dig
if (nocheat_p != p_under) {
infostream << "Server: " << player->getName()
<< " started digging "
<< PP(nocheat_p) << " and completed digging "
<< PP(p_under) << "; not digging." << std::endl;
is_valid_dig = false;
// Call callbacks
m_script->on_cheat(playersao, "finished_unknown_dig");
}
// Get player's wielded item
// See also: Game::handleDigging
ItemStack selected_item, hand_item;
playersao->getPlayer()->getWieldedItem(&selected_item, &hand_item);
// Get diggability and expected digging time
DigParams params = getDigParams(m_nodedef->get(n).groups,
&selected_item.getToolCapabilities(m_itemdef));
// If can't dig, try hand
if (!params.diggable) {
params = getDigParams(m_nodedef->get(n).groups,
&hand_item.getToolCapabilities(m_itemdef));
}
// If can't dig, ignore dig
if (!params.diggable) {
infostream << "Server: " << player->getName()
<< " completed digging " << PP(p_under)
<< ", which is not diggable with tool; not digging."
<< std::endl;
is_valid_dig = false;
// Call callbacks
m_script->on_cheat(playersao, "dug_unbreakable");
}
// Check digging time
// If already invalidated, we don't have to
if (!is_valid_dig) {
// Well not our problem then
}
// Clean and long dig
else if (params.time > 2.0 && nocheat_t * 1.2 > params.time) {
// All is good, but grab time from pool; don't care if
// it's actually available
playersao->getDigPool().grab(params.time);
}
// Short or laggy dig
// Try getting the time from pool
else if (playersao->getDigPool().grab(params.time)) {
// All is good
}
// Dig not possible
else {
infostream << "Server: " << player->getName()
<< " completed digging " << PP(p_under)
<< "too fast; not digging." << std::endl;
is_valid_dig = false;
// Call callbacks
m_script->on_cheat(playersao, "dug_too_fast");
}
}
/* Actually dig node */
if (is_valid_dig && n.getContent() != CONTENT_IGNORE)
m_script->node_on_dig(p_under, n, playersao);
v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
RemoteClient *client = getClient(peer_id);
// Send unusual result (that is, node not being removed)
if (m_env->getMap().getNode(p_under).getContent() != CONTENT_AIR) {
// Re-send block to revert change on client-side
client->SetBlockNotSent(blockpos);
}
else {
client->ResendBlockIfOnWire(blockpos);
}
}
} // action == INTERACT_DIGGING_COMPLETED
/*
3: place block or right-click object
*/
else if (action == INTERACT_PLACE) {
ItemStack selected_item;
playersao->getWieldedItem(&selected_item, nullptr);
// Reset build time counter
if (pointed.type == POINTEDTHING_NODE &&
selected_item.getDefinition(m_itemdef).type == ITEM_NODE)
getClient(peer_id)->m_time_from_building = 0.0;
if (pointed.type == POINTEDTHING_OBJECT) {
// Right click object
// Skip if object can't be interacted with anymore
if (pointed_object->isGone())
return;
actionstream << player->getName() << " right-clicks object "
<< pointed.object_id << ": "
<< pointed_object->getDescription() << std::endl;
// Do stuff
if (m_script->item_OnSecondaryUse(
selected_item, playersao, pointed)) {
if (playersao->setWieldedItem(selected_item)) {
SendInventory(playersao, true);
}
}
pointed_object->rightClick(playersao);
} else if (m_script->item_OnPlace(
selected_item, playersao, pointed)) {
// Placement was handled in lua
// Apply returned ItemStack
if (playersao->setWieldedItem(selected_item)) {
SendInventory(playersao, true);
}
}
// If item has node placement prediction, always send the
// blocks to make sure the client knows what exactly happened
RemoteClient *client = getClient(peer_id);
v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
v3s16 blockpos2 = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
if (!selected_item.getDefinition(m_itemdef).node_placement_prediction.empty()) {
client->SetBlockNotSent(blockpos);
if (blockpos2 != blockpos) {
client->SetBlockNotSent(blockpos2);
}
}
else {
client->ResendBlockIfOnWire(blockpos);
if (blockpos2 != blockpos) {
client->ResendBlockIfOnWire(blockpos2);
}
}
} // action == INTERACT_PLACE
/*
4: use
*/
else if (action == INTERACT_USE) {
ItemStack selected_item;
playersao->getWieldedItem(&selected_item, nullptr);
actionstream << player->getName() << " uses " << selected_item.name
<< ", pointing at " << pointed.dump() << std::endl;
if (m_script->item_OnUse(
selected_item, playersao, pointed)) {
// Apply returned ItemStack
if (playersao->setWieldedItem(selected_item)) {
SendInventory(playersao, true);
}
}
} // action == INTERACT_USE
/*
5: rightclick air
*/
else if (action == INTERACT_ACTIVATE) {
ItemStack selected_item;
playersao->getWieldedItem(&selected_item, nullptr);
actionstream << player->getName() << " activates "
<< selected_item.name << std::endl;
pointed.type = POINTEDTHING_NOTHING; // can only ever be NOTHING
if (m_script->item_OnSecondaryUse(
selected_item, playersao, pointed)) {
if (playersao->setWieldedItem(selected_item)) {
SendInventory(playersao, true);
}
}
} // action == INTERACT_ACTIVATE
/*
Catch invalid actions
*/
else {
warningstream << "Server: Invalid action "
<< action << std::endl;
}
}
void Server::handleCommand_RemovedSounds(NetworkPacket* pkt)
{
u16 num;
*pkt >> num;
for (u16 k = 0; k < num; k++) {
s32 id;
*pkt >> id;
std::unordered_map<s32, ServerPlayingSound>::iterator i =
m_playing_sounds.find(id);
if (i == m_playing_sounds.end())
continue;
ServerPlayingSound &psound = i->second;
psound.clients.erase(pkt->getPeerId());
if (psound.clients.empty())
m_playing_sounds.erase(i++);
}
}
void Server::handleCommand_NodeMetaFields(NetworkPacket* pkt)
{
v3s16 p;
std::string formname;
u16 num;
*pkt >> p >> formname >> num;
StringMap fields;
for (u16 k = 0; k < num; k++) {
std::string fieldname;
*pkt >> fieldname;
fields[fieldname] = pkt->readLongString();
}
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
PlayerSAO *playersao = player->getPlayerSAO();
if (playersao == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player object for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
// If something goes wrong, this player is to blame
RollbackScopeActor rollback_scope(m_rollback,
std::string("player:")+player->getName());
// Check the target node for rollback data; leave others unnoticed
RollbackNode rn_old(&m_env->getMap(), p, this);
m_script->node_on_receive_fields(p, formname, fields, playersao);
// Report rollback data
RollbackNode rn_new(&m_env->getMap(), p, this);
if (rollback() && rn_new != rn_old) {
RollbackAction action;
action.setSetNode(p, rn_old, rn_new);
rollback()->reportAction(action);
}
}
void Server::handleCommand_InventoryFields(NetworkPacket* pkt)
{
std::string client_formspec_name;
u16 num;
*pkt >> client_formspec_name >> num;
StringMap fields;
for (u16 k = 0; k < num; k++) {
std::string fieldname;
*pkt >> fieldname;
fields[fieldname] = pkt->readLongString();
}
session_t peer_id = pkt->getPeerId();
RemotePlayer *player = m_env->getPlayer(peer_id);
if (player == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
PlayerSAO *playersao = player->getPlayerSAO();
if (playersao == NULL) {
errorstream <<
"Server::ProcessData(): Canceling: No player object for peer_id=" <<
peer_id << " disconnecting peer!" << std::endl;
DisconnectPeer(peer_id);
return;
}
if (client_formspec_name.empty()) { // pass through inventory submits
m_script->on_playerReceiveFields(playersao, client_formspec_name, fields);
return;
}
// verify that we displayed the formspec to the user
const auto peer_state_iterator = m_formspec_state_data.find(peer_id);
if (peer_state_iterator != m_formspec_state_data.end()) {
const std::string &server_formspec_name = peer_state_iterator->second;
if (client_formspec_name == server_formspec_name) {
auto it = fields.find("quit");
if (it != fields.end() && it->second == "true")
m_formspec_state_data.erase(peer_state_iterator);
m_script->on_playerReceiveFields(playersao, client_formspec_name, fields);
return;
}
actionstream << "'" << player->getName()
<< "' submitted formspec ('" << client_formspec_name
<< "') but the name of the formspec doesn't match the"
" expected name ('" << server_formspec_name << "')";
} else {
actionstream << "'" << player->getName()
<< "' submitted formspec ('" << client_formspec_name
<< "') but server hasn't sent formspec to client";
}
actionstream << ", possible exploitation attempt" << std::endl;
}
void Server::handleCommand_FirstSrp(NetworkPacket* pkt)
{
session_t peer_id = pkt->getPeerId();
RemoteClient *client = getClient(peer_id, CS_Invalid);
ClientState cstate = client->getState();
std::string playername = client->getName();
std::string salt;
std::string verification_key;
std::string addr_s = getPeerAddress(peer_id).serializeString();
u8 is_empty;
*pkt >> salt >> verification_key >> is_empty;
verbosestream << "Server: Got TOSERVER_FIRST_SRP from " << addr_s
<< ", with is_empty=" << (is_empty == 1) << std::endl;
// Either this packet is sent because the user is new or to change the password
if (cstate == CS_HelloSent) {
if (!client->isMechAllowed(AUTH_MECHANISM_FIRST_SRP)) {
actionstream << "Server: Client from " << addr_s
<< " tried to set password without being "
<< "authenticated, or the username being new." << std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
return;
}
if (!isSingleplayer() &&
g_settings->getBool("disallow_empty_password") &&
is_empty == 1) {
actionstream << "Server: " << playername
<< " supplied empty password from " << addr_s << std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_EMPTY_PASSWORD);
return;
}
std::string initial_ver_key;
initial_ver_key = encode_srp_verifier(verification_key, salt);
m_script->createAuth(playername, initial_ver_key);
m_script->on_authplayer(playername, addr_s, true);
acceptAuth(peer_id, false);
} else {
if (cstate < CS_SudoMode) {
infostream << "Server::ProcessData(): Ignoring TOSERVER_FIRST_SRP from "
<< addr_s << ": " << "Client has wrong state " << cstate << "."
<< std::endl;
return;
}
m_clients.event(peer_id, CSE_SudoLeave);
std::string pw_db_field = encode_srp_verifier(verification_key, salt);
bool success = m_script->setPassword(playername, pw_db_field);
if (success) {
actionstream << playername << " changes password" << std::endl;
SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
L"Password change successful."));
} else {
actionstream << playername <<
" tries to change password but it fails" << std::endl;
SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
L"Password change failed or unavailable."));
}
}
}
void Server::handleCommand_SrpBytesA(NetworkPacket* pkt)
{
session_t peer_id = pkt->getPeerId();
RemoteClient *client = getClient(peer_id, CS_Invalid);
ClientState cstate = client->getState();
bool wantSudo = (cstate == CS_Active);
if (!((cstate == CS_HelloSent) || (cstate == CS_Active))) {
actionstream << "Server: got SRP _A packet in wrong state " << cstate <<
" from " << getPeerAddress(peer_id).serializeString() <<
". Ignoring." << std::endl;
return;
}
if (client->chosen_mech != AUTH_MECHANISM_NONE) {
actionstream << "Server: got SRP _A packet, while auth is already "
"going on with mech " << client->chosen_mech << " from " <<
getPeerAddress(peer_id).serializeString() <<
" (wantSudo=" << wantSudo << "). Ignoring." << std::endl;
if (wantSudo) {
DenySudoAccess(peer_id);
return;
}
DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
return;
}
std::string bytes_A;
u8 based_on;
*pkt >> bytes_A >> based_on;
infostream << "Server: TOSERVER_SRP_BYTES_A received with "
<< "based_on=" << int(based_on) << " and len_A="
<< bytes_A.length() << "." << std::endl;
AuthMechanism chosen = (based_on == 0) ?
AUTH_MECHANISM_LEGACY_PASSWORD : AUTH_MECHANISM_SRP;
if (wantSudo) {
if (!client->isSudoMechAllowed(chosen)) {
actionstream << "Server: Player \"" << client->getName() <<
"\" at " << getPeerAddress(peer_id).serializeString() <<
" tried to change password using unallowed mech " << chosen <<
"." << std::endl;
DenySudoAccess(peer_id);
return;
}
} else {
if (!client->isMechAllowed(chosen)) {
actionstream << "Server: Client tried to authenticate from " <<
getPeerAddress(peer_id).serializeString() <<
" using unallowed mech " << chosen << "." << std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
return;
}
}
client->chosen_mech = chosen;
std::string salt;
std::string verifier;
if (based_on == 0) {
generate_srp_verifier_and_salt(client->getName(), client->enc_pwd,
&verifier, &salt);
} else if (!decode_srp_verifier_and_salt(client->enc_pwd, &verifier, &salt)) {
// Non-base64 errors should have been catched in the init handler
actionstream << "Server: User " << client->getName() <<
" tried to log in, but srp verifier field was invalid (most likely "
"invalid base64)." << std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_SERVER_FAIL);
return;
}
char *bytes_B = 0;
size_t len_B = 0;
client->auth_data = srp_verifier_new(SRP_SHA256, SRP_NG_2048,
client->getName().c_str(),
(const unsigned char *) salt.c_str(), salt.size(),
(const unsigned char *) verifier.c_str(), verifier.size(),
(const unsigned char *) bytes_A.c_str(), bytes_A.size(),
NULL, 0,
(unsigned char **) &bytes_B, &len_B, NULL, NULL);
if (!bytes_B) {
actionstream << "Server: User " << client->getName()
<< " tried to log in, SRP-6a safety check violated in _A handler."
<< std::endl;
if (wantSudo) {
DenySudoAccess(peer_id);
return;
}
DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
return;
}
NetworkPacket resp_pkt(TOCLIENT_SRP_BYTES_S_B, 0, peer_id);
resp_pkt << salt << std::string(bytes_B, len_B);
Send(&resp_pkt);
}
void Server::handleCommand_SrpBytesM(NetworkPacket* pkt)
{
session_t peer_id = pkt->getPeerId();
RemoteClient *client = getClient(peer_id, CS_Invalid);
ClientState cstate = client->getState();
std::string addr_s = getPeerAddress(pkt->getPeerId()).serializeString();
std::string playername = client->getName();
bool wantSudo = (cstate == CS_Active);
verbosestream << "Server: Received TOCLIENT_SRP_BYTES_M." << std::endl;
if (!((cstate == CS_HelloSent) || (cstate == CS_Active))) {
actionstream << "Server: got SRP _M packet in wrong state "
<< cstate << " from " << addr_s
<< ". Ignoring." << std::endl;
return;
}
if (client->chosen_mech != AUTH_MECHANISM_SRP &&
client->chosen_mech != AUTH_MECHANISM_LEGACY_PASSWORD) {
actionstream << "Server: got SRP _M packet, while auth"
<< "is going on with mech " << client->chosen_mech << " from "
<< addr_s << " (wantSudo=" << wantSudo << "). Denying." << std::endl;
if (wantSudo) {
DenySudoAccess(peer_id);
return;
}
DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
return;
}
std::string bytes_M;
*pkt >> bytes_M;
if (srp_verifier_get_session_key_length((SRPVerifier *) client->auth_data)
!= bytes_M.size()) {
actionstream << "Server: User " << playername << " at " << addr_s
<< " sent bytes_M with invalid length " << bytes_M.size() << std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
return;
}
unsigned char *bytes_HAMK = 0;
srp_verifier_verify_session((SRPVerifier *) client->auth_data,
(unsigned char *)bytes_M.c_str(), &bytes_HAMK);
if (!bytes_HAMK) {
if (wantSudo) {
actionstream << "Server: User " << playername << " at " << addr_s
<< " tried to change their password, but supplied wrong"
<< " (SRP) password for authentication." << std::endl;
DenySudoAccess(peer_id);
return;
}
actionstream << "Server: User " << playername << " at " << addr_s
<< " supplied wrong password (auth mechanism: SRP)." << std::endl;
m_script->on_authplayer(playername, addr_s, false);
DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_PASSWORD);
return;
}
if (client->create_player_on_auth_success) {
m_script->createAuth(playername, client->enc_pwd);
std::string checkpwd; // not used, but needed for passing something
if (!m_script->getAuth(playername, &checkpwd, NULL)) {
actionstream << "Server: " << playername <<
" cannot be authenticated (auth handler does not work?)" <<
std::endl;
DenyAccess(peer_id, SERVER_ACCESSDENIED_SERVER_FAIL);
return;
}
client->create_player_on_auth_success = false;
}
m_script->on_authplayer(playername, addr_s, true);
acceptAuth(peer_id, wantSudo);
}
/*
* Mod channels
*/
void Server::handleCommand_ModChannelJoin(NetworkPacket *pkt)
{
std::string channel_name;
*pkt >> channel_name;
session_t peer_id = pkt->getPeerId();
NetworkPacket resp_pkt(TOCLIENT_MODCHANNEL_SIGNAL,
1 + 2 + channel_name.size(), peer_id);
// Send signal to client to notify join succeed or not
if (g_settings->getBool("enable_mod_channels") &&
m_modchannel_mgr->joinChannel(channel_name, peer_id)) {
resp_pkt << (u8) MODCHANNEL_SIGNAL_JOIN_OK;
infostream << "Peer " << peer_id << " joined channel " <<
channel_name << std::endl;
}
else {
resp_pkt << (u8)MODCHANNEL_SIGNAL_JOIN_FAILURE;
infostream << "Peer " << peer_id << " tried to join channel " <<
channel_name << ", but was already registered." << std::endl;
}
resp_pkt << channel_name;
Send(&resp_pkt);
}
void Server::handleCommand_ModChannelLeave(NetworkPacket *pkt)
{
std::string channel_name;
*pkt >> channel_name;
session_t peer_id = pkt->getPeerId();
NetworkPacket resp_pkt(TOCLIENT_MODCHANNEL_SIGNAL,
1 + 2 + channel_name.size(), peer_id);
// Send signal to client to notify join succeed or not
if (g_settings->getBool("enable_mod_channels") &&
m_modchannel_mgr->leaveChannel(channel_name, peer_id)) {
resp_pkt << (u8)MODCHANNEL_SIGNAL_LEAVE_OK;
infostream << "Peer " << peer_id << " left channel " << channel_name <<
std::endl;
} else {
resp_pkt << (u8) MODCHANNEL_SIGNAL_LEAVE_FAILURE;
infostream << "Peer " << peer_id << " left channel " << channel_name <<
", but was not registered." << std::endl;
}
resp_pkt << channel_name;
Send(&resp_pkt);
}
void Server::handleCommand_ModChannelMsg(NetworkPacket *pkt)
{
std::string channel_name, channel_msg;
*pkt >> channel_name >> channel_msg;
session_t peer_id = pkt->getPeerId();
verbosestream << "Mod channel message received from peer " << peer_id <<
" on channel " << channel_name << " message: " << channel_msg <<
std::endl;
// If mod channels are not enabled, discard message
if (!g_settings->getBool("enable_mod_channels")) {
return;
}
// If channel not registered, signal it and ignore message
if (!m_modchannel_mgr->channelRegistered(channel_name)) {
NetworkPacket resp_pkt(TOCLIENT_MODCHANNEL_SIGNAL,
1 + 2 + channel_name.size(), peer_id);
resp_pkt << (u8)MODCHANNEL_SIGNAL_CHANNEL_NOT_REGISTERED << channel_name;
Send(&resp_pkt);
return;
}
// @TODO: filter, rate limit
broadcastModChannelMessage(channel_name, channel_msg, peer_id);
}
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