src/network/serverpackethandler.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2015 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "chatmessage.h"
  21 #include "server.h"
  22 #include "log.h"
  23 #include "emerge.h"
  24 #include "mapblock.h"
  25 #include "modchannels.h"
  26 #include "nodedef.h"
  27 #include "remoteplayer.h"
  28 #include "rollback_interface.h"
  29 #include "scripting_server.h"
  30 #include "settings.h"
  31 #include "tool.h"
  32 #include "version.h"
  33 #include "network/connection.h"
  34 #include "network/networkprotocol.h"
  35 #include "network/serveropcodes.h"
  36 #include "server/player_sao.h"
  37 #include "server/serverinventorymgr.h"
  38 #include "util/auth.h"
  39 #include "util/base64.h"
  40 #include "util/pointedthing.h"
  41 #include "util/serialize.h"
  42 #include "util/srp.h"
  43
  44 void Server::handleCommand_Deprecated(NetworkPacket* pkt)
  45 {
  46         infostream << "Server: " << toServerCommandTable[pkt->getCommand()].name
  47                 << " not supported anymore" << std::endl;
  48 }
  49
  50 void Server::handleCommand_Init(NetworkPacket* pkt)
  51 {
  52
  53         if(pkt->getSize() < 1)
  54                 return;
  55
  56         session_t peer_id = pkt->getPeerId();
  57         RemoteClient *client = getClient(peer_id, CS_Created);
  58
  59         Address addr;
  60         std::string addr_s;
  61         try {
  62                 addr = m_con->GetPeerAddress(peer_id);
  63                 addr_s = addr.serializeString();
  64         } catch (con::PeerNotFoundException &e) {
  65                 /*
  66                  * no peer for this packet found
  67                  * most common reason is peer timeout, e.g. peer didn't
  68                  * respond for some time, your server was overloaded or
  69                  * things like that.
  70                  */
  71                 infostream << "Server::ProcessData(): Canceling: peer " << peer_id <<
  72                         " not found" << std::endl;
  73                 return;
  74         }
  75
  76         if (client->getState() > CS_Created) {
  77                 verbosestream << "Server: Ignoring multiple TOSERVER_INITs from " <<
  78                         addr_s << " (peer_id=" << peer_id << ")" << std::endl;
  79                 return;
  80         }
  81
  82         client->setCachedAddress(addr);
  83
  84         verbosestream << "Server: Got TOSERVER_INIT from " << addr_s <<
  85                 " (peer_id=" << peer_id << ")" << std::endl;
  86
  87         // Do not allow multiple players in simple singleplayer mode.
  88         // This isn't a perfect way to do it, but will suffice for now
  89         if (m_simple_singleplayer_mode && m_clients.getClientIDs().size() > 1) {
  90                 infostream << "Server: Not allowing another client (" << addr_s <<
  91                         ") to connect in simple singleplayer mode" << std::endl;
  92                 DenyAccess(peer_id, SERVER_ACCESSDENIED_SINGLEPLAYER);
  93                 return;
  94         }
  95
  96         // First byte after command is maximum supported
  97         // serialization version
  98         u8 client_max;
  99         u16 supp_compr_modes;
 100         u16 min_net_proto_version = 0;
 101         u16 max_net_proto_version;
 102         std::string playerName;
 103
 104         *pkt >> client_max >> supp_compr_modes >> min_net_proto_version
 105                         >> max_net_proto_version >> playerName;
 106
 107         u8 our_max = SER_FMT_VER_HIGHEST_READ;
 108         // Use the highest version supported by both
 109         u8 depl_serial_v = std::min(client_max, our_max);
 110         // If it's lower than the lowest supported, give up.
 111         if (depl_serial_v < SER_FMT_VER_LOWEST_READ)
 112                 depl_serial_v = SER_FMT_VER_INVALID;
 113
 114         if (depl_serial_v == SER_FMT_VER_INVALID) {
 115                 actionstream << "Server: A mismatched client tried to connect from " <<
 116                         addr_s << " ser_fmt_max=" << (int)client_max << std::endl;
 117                 DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_VERSION);
 118                 return;
 119         }
 120
 121         client->setPendingSerializationVersion(depl_serial_v);
 122
 123         /*
 124                 Read and check network protocol version
 125         */
 126
 127         u16 net_proto_version = 0;
 128
 129         // Figure out a working version if it is possible at all
 130         if (max_net_proto_version >= SERVER_PROTOCOL_VERSION_MIN ||
 131                         min_net_proto_version <= SERVER_PROTOCOL_VERSION_MAX) {
 132                 // If maximum is larger than our maximum, go with our maximum
 133                 if (max_net_proto_version > SERVER_PROTOCOL_VERSION_MAX)
 134                         net_proto_version = SERVER_PROTOCOL_VERSION_MAX;
 135                 // Else go with client's maximum
 136                 else
 137                         net_proto_version = max_net_proto_version;
 138         }
 139
 140         verbosestream << "Server: " << addr_s << ": Protocol version: min: "
 141                         << min_net_proto_version << ", max: " << max_net_proto_version
 142                         << ", chosen: " << net_proto_version << std::endl;
 143
 144         client->net_proto_version = net_proto_version;
 145
 146         if ((g_settings->getBool("strict_protocol_version_checking") &&
 147                         net_proto_version != LATEST_PROTOCOL_VERSION) ||
 148                         net_proto_version < SERVER_PROTOCOL_VERSION_MIN ||
 149                         net_proto_version > SERVER_PROTOCOL_VERSION_MAX) {
 150                 actionstream << "Server: A mismatched client tried to connect from " <<
 151                         addr_s << " proto_max=" << (int)max_net_proto_version << std::endl;
 152                 DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_VERSION);
 153                 return;
 154         }
 155
 156         /*
 157                 Validate player name
 158         */
 159         const char* playername = playerName.c_str();
 160
 161         size_t pns = playerName.size();
 162         if (pns == 0 || pns > PLAYERNAME_SIZE) {
 163                 actionstream << "Server: Player with " <<
 164                         ((pns > PLAYERNAME_SIZE) ? "a too long" : "an empty") <<
 165                         " name tried to connect from " << addr_s << std::endl;
 166                 DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_NAME);
 167                 return;
 168         }
 169
 170         if (!string_allowed(playerName, PLAYERNAME_ALLOWED_CHARS)) {
 171                 actionstream << "Server: Player with an invalid name tried to connect "
 172                         "from " << addr_s << std::endl;
 173                 DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_CHARS_IN_NAME);
 174                 return;
 175         }
 176
 177         RemotePlayer *player = m_env->getPlayer(playername);
 178
 179         // If player is already connected, cancel
 180         if (player && player->getPeerId() != PEER_ID_INEXISTENT) {
 181                 actionstream << "Server: Player with name \"" << playername <<
 182                         "\" tried to connect, but player with same name is already connected" << std::endl;
 183                 DenyAccess(peer_id, SERVER_ACCESSDENIED_ALREADY_CONNECTED);
 184                 return;
 185         }
 186
 187         m_clients.setPlayerName(peer_id, playername);
 188         //TODO (later) case insensitivity
 189
 190         std::string legacyPlayerNameCasing = playerName;
 191
 192         if (!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0) {
 193                 actionstream << "Server: Player with the name \"singleplayer\" tried "
 194                         "to connect from " << addr_s << std::endl;
 195                 DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_NAME);
 196                 return;
 197         }
 198
 199         {
 200                 std::string reason;
 201                 if (m_script->on_prejoinplayer(playername, addr_s, &reason)) {
 202                         actionstream << "Server: Player with the name \"" << playerName <<
 203                                 "\" tried to connect from " << addr_s <<
 204                                 " but it was disallowed for the following reason: " << reason <<
 205                                 std::endl;
 206                         DenyAccess(peer_id, SERVER_ACCESSDENIED_CUSTOM_STRING, reason);
 207                         return;
 208                 }
 209         }
 210
 211         infostream << "Server: New connection: \"" << playerName << "\" from " <<
 212                 addr_s << " (peer_id=" << peer_id << ")" << std::endl;
 213
 214         // Enforce user limit.
 215         // Don't enforce for users that have some admin right or mod permits it.
 216         if (m_clients.isUserLimitReached() &&
 217                         playername != g_settings->get("name") &&
 218                         !m_script->can_bypass_userlimit(playername, addr_s)) {
 219                 actionstream << "Server: " << playername << " tried to join from " <<
 220                         addr_s << ", but there are already max_users=" <<
 221                         g_settings->getU16("max_users") << " players." << std::endl;
 222                 DenyAccess(peer_id, SERVER_ACCESSDENIED_TOO_MANY_USERS);
 223                 return;
 224         }
 225
 226         /*
 227                 Compose auth methods for answer
 228         */
 229         std::string encpwd; // encrypted Password field for the user
 230         bool has_auth = m_script->getAuth(playername, &encpwd, NULL);
 231         u32 auth_mechs = 0;
 232
 233         client->chosen_mech = AUTH_MECHANISM_NONE;
 234
 235         if (has_auth) {
 236                 std::vector<std::string> pwd_components = str_split(encpwd, '#');
 237                 if (pwd_components.size() == 4) {
 238                         if (pwd_components[1] == "1") { // 1 means srp
 239                                 auth_mechs |= AUTH_MECHANISM_SRP;
 240                                 client->enc_pwd = encpwd;
 241                         } else {
 242                                 actionstream << "User " << playername << " tried to log in, "
 243                                         "but password field was invalid (unknown mechcode)." <<
 244                                         std::endl;
 245                                 DenyAccess(peer_id, SERVER_ACCESSDENIED_SERVER_FAIL);
 246                                 return;
 247                         }
 248                 } else if (base64_is_valid(encpwd)) {
 249                         auth_mechs |= AUTH_MECHANISM_LEGACY_PASSWORD;
 250                         client->enc_pwd = encpwd;
 251                 } else {
 252                         actionstream << "User " << playername << " tried to log in, but "
 253                                 "password field was invalid (invalid base64)." << std::endl;
 254                         DenyAccess(peer_id, SERVER_ACCESSDENIED_SERVER_FAIL);
 255                         return;
 256                 }
 257         } else {
 258                 std::string default_password = g_settings->get("default_password");
 259                 if (default_password.length() == 0) {
 260                         auth_mechs |= AUTH_MECHANISM_FIRST_SRP;
 261                 } else {
 262                         // Take care of default passwords.
 263                         client->enc_pwd = get_encoded_srp_verifier(playerName, default_password);
 264                         auth_mechs |= AUTH_MECHANISM_SRP;
 265                         // Allocate player in db, but only on successful login.
 266                         client->create_player_on_auth_success = true;
 267                 }
 268         }
 269
 270         /*
 271                 Answer with a TOCLIENT_HELLO
 272         */
 273
 274         verbosestream << "Sending TOCLIENT_HELLO with auth method field: "
 275                 << auth_mechs << std::endl;
 276
 277         NetworkPacket resp_pkt(TOCLIENT_HELLO,
 278                 1 + 4 + legacyPlayerNameCasing.size(), peer_id);
 279
 280         u16 depl_compress_mode = NETPROTO_COMPRESSION_NONE;
 281         resp_pkt << depl_serial_v << depl_compress_mode << net_proto_version
 282                 << auth_mechs << legacyPlayerNameCasing;
 283
 284         Send(&resp_pkt);
 285
 286         client->allowed_auth_mechs = auth_mechs;
 287         client->setDeployedCompressionMode(depl_compress_mode);
 288
 289         m_clients.event(peer_id, CSE_Hello);
 290 }
 291
 292 void Server::handleCommand_Init2(NetworkPacket* pkt)
 293 {
 294         session_t peer_id = pkt->getPeerId();
 295         verbosestream << "Server: Got TOSERVER_INIT2 from " << peer_id << std::endl;
 296
 297         m_clients.event(peer_id, CSE_GotInit2);
 298         u16 protocol_version = m_clients.getProtocolVersion(peer_id);
 299
 300         std::string lang;
 301         if (pkt->getSize() > 0)
 302                 *pkt >> lang;
 303
 304         /*
 305                 Send some initialization data
 306         */
 307
 308         infostream << "Server: Sending content to " << getPlayerName(peer_id) <<
 309                 std::endl;
 310
 311         // Send item definitions
 312         SendItemDef(peer_id, m_itemdef, protocol_version);
 313
 314         // Send node definitions
 315         SendNodeDef(peer_id, m_nodedef, protocol_version);
 316
 317         m_clients.event(peer_id, CSE_SetDefinitionsSent);
 318
 319         // Send media announcement
 320         sendMediaAnnouncement(peer_id, lang);
 321
 322         RemoteClient *client = getClient(peer_id, CS_InitDone);
 323
 324         // Keep client language for server translations
 325         client->setLangCode(lang);
 326
 327         // Send active objects
 328         {
 329                 PlayerSAO *sao = getPlayerSAO(peer_id);
 330                 if (sao)
 331                         SendActiveObjectRemoveAdd(client, sao);
 332         }
 333
 334         // Send detached inventories
 335         sendDetachedInventories(peer_id, false);
 336
 337         // Send player movement settings
 338         SendMovement(peer_id);
 339
 340         // Send time of day
 341         u16 time = m_env->getTimeOfDay();
 342         float time_speed = g_settings->getFloat("time_speed");
 343         SendTimeOfDay(peer_id, time, time_speed);
 344
 345         SendCSMRestrictionFlags(peer_id);
 346
 347         // Warnings about protocol version can be issued here
 348         if (client->net_proto_version < LATEST_PROTOCOL_VERSION) {
 349                 SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
 350                         L"# Server: WARNING: YOUR CLIENT'S VERSION MAY NOT BE FULLY COMPATIBLE "
 351                         L"WITH THIS SERVER!"));
 352         }
 353 }
 354
 355 void Server::handleCommand_RequestMedia(NetworkPacket* pkt)
 356 {
 357         std::vector<std::string> tosend;
 358         u16 numfiles;
 359
 360         *pkt >> numfiles;
 361
 362         session_t peer_id = pkt->getPeerId();
 363         infostream << "Sending " << numfiles << " files to " <<
 364                 getPlayerName(peer_id) << std::endl;
 365         verbosestream << "TOSERVER_REQUEST_MEDIA: requested file(s)" << std::endl;
 366
 367         for (u16 i = 0; i < numfiles; i++) {
 368                 std::string name;
 369
 370                 *pkt >> name;
 371
 372                 tosend.emplace_back(name);
 373                 verbosestream << "  " << name << std::endl;
 374         }
 375
 376         sendRequestedMedia(peer_id, tosend);
 377 }
 378
 379 void Server::handleCommand_ClientReady(NetworkPacket* pkt)
 380 {
 381         session_t peer_id = pkt->getPeerId();
 382
 383         PlayerSAO* playersao = StageTwoClientInit(peer_id);
 384
 385         if (playersao == NULL) {
 386                 errorstream << "TOSERVER_CLIENT_READY stage 2 client init failed "
 387                         "peer_id=" << peer_id << std::endl;
 388                 DisconnectPeer(peer_id);
 389                 return;
 390         }
 391
 392
 393         if (pkt->getSize() < 8) {
 394                 errorstream << "TOSERVER_CLIENT_READY client sent inconsistent data, "
 395                         "disconnecting peer_id: " << peer_id << std::endl;
 396                 DisconnectPeer(peer_id);
 397                 return;
 398         }
 399
 400         u8 major_ver, minor_ver, patch_ver, reserved;
 401         std::string full_ver;
 402         *pkt >> major_ver >> minor_ver >> patch_ver >> reserved >> full_ver;
 403
 404         m_clients.setClientVersion(peer_id, major_ver, minor_ver, patch_ver,
 405                 full_ver);
 406
 407         if (pkt->getRemainingBytes() >= 2)
 408                 *pkt >> playersao->getPlayer()->formspec_version;
 409
 410         const std::vector<std::string> &players = m_clients.getPlayerNames();
 411         NetworkPacket list_pkt(TOCLIENT_UPDATE_PLAYER_LIST, 0, peer_id);
 412         list_pkt << (u8) PLAYER_LIST_INIT << (u16) players.size();
 413         for (const std::string &player: players) {
 414                 list_pkt <<  player;
 415         }
 416         m_clients.send(peer_id, 0, &list_pkt, true);
 417
 418         NetworkPacket notice_pkt(TOCLIENT_UPDATE_PLAYER_LIST, 0, PEER_ID_INEXISTENT);
 419         // (u16) 1 + std::string represents a pseudo vector serialization representation
 420         notice_pkt << (u8) PLAYER_LIST_ADD << (u16) 1 << std::string(playersao->getPlayer()->getName());
 421         m_clients.sendToAll(&notice_pkt);
 422         m_clients.event(peer_id, CSE_SetClientReady);
 423
 424         s64 last_login;
 425         m_script->getAuth(playersao->getPlayer()->getName(), nullptr, nullptr, &last_login);
 426         m_script->on_joinplayer(playersao, last_login);
 427
 428         // Send shutdown timer if shutdown has been scheduled
 429         if (m_shutdown_state.isTimerRunning()) {
 430                 SendChatMessage(peer_id, m_shutdown_state.getShutdownTimerMessage());
 431         }
 432 }
 433
 434 void Server::handleCommand_GotBlocks(NetworkPacket* pkt)
 435 {
 436         if (pkt->getSize() < 1)
 437                 return;
 438
 439         /*
 440                 [0] u16 command
 441                 [2] u8 count
 442                 [3] v3s16 pos_0
 443                 [3+6] v3s16 pos_1
 444                 ...
 445         */
 446
 447         u8 count;
 448         *pkt >> count;
 449
 450         if ((s16)pkt->getSize() < 1 + (int)count * 6) {
 451                 throw con::InvalidIncomingDataException
 452                                 ("GOTBLOCKS length is too short");
 453         }
 454
 455         m_clients.lock();
 456         RemoteClient *client = m_clients.lockedGetClientNoEx(pkt->getPeerId());
 457
 458         for (u16 i = 0; i < count; i++) {
 459                 v3s16 p;
 460                 *pkt >> p;
 461                 client->GotBlock(p);
 462         }
 463         m_clients.unlock();
 464 }
 465
 466 void Server::process_PlayerPos(RemotePlayer *player, PlayerSAO *playersao,
 467         NetworkPacket *pkt)
 468 {
 469         if (pkt->getRemainingBytes() < 12 + 12 + 4 + 4 + 4 + 1 + 1)
 470                 return;
 471
 472         v3s32 ps, ss;
 473         s32 f32pitch, f32yaw;
 474         u8 f32fov;
 475
 476         *pkt >> ps;
 477         *pkt >> ss;
 478         *pkt >> f32pitch;
 479         *pkt >> f32yaw;
 480
 481         f32 pitch = (f32)f32pitch / 100.0f;
 482         f32 yaw = (f32)f32yaw / 100.0f;
 483         u32 keyPressed = 0;
 484
 485         // default behavior (in case an old client doesn't send these)
 486         f32 fov = 0;
 487         u8 wanted_range = 0;
 488
 489         *pkt >> keyPressed;
 490         *pkt >> f32fov;
 491         fov = (f32)f32fov / 80.0f;
 492         *pkt >> wanted_range;
 493
 494         v3f position((f32)ps.X / 100.0f, (f32)ps.Y / 100.0f, (f32)ps.Z / 100.0f);
 495         v3f speed((f32)ss.X / 100.0f, (f32)ss.Y / 100.0f, (f32)ss.Z / 100.0f);
 496
 497         pitch = modulo360f(pitch);
 498         yaw = wrapDegrees_0_360(yaw);
 499
 500         if (!playersao->isAttached()) {
 501                 // Only update player positions when moving freely
 502                 // to not interfere with attachment handling
 503                 playersao->setBasePosition(position);
 504                 player->setSpeed(speed);
 505         }
 506         playersao->setLookPitch(pitch);
 507         playersao->setPlayerYaw(yaw);
 508         playersao->setFov(fov);
 509         playersao->setWantedRange(wanted_range);
 510
 511         player->keyPressed = keyPressed;
 512         player->control.jump  = (keyPressed & (0x1 << 4));
 513         player->control.aux1  = (keyPressed & (0x1 << 5));
 514         player->control.sneak = (keyPressed & (0x1 << 6));
 515         player->control.dig   = (keyPressed & (0x1 << 7));
 516         player->control.place = (keyPressed & (0x1 << 8));
 517         player->control.zoom  = (keyPressed & (0x1 << 9));
 518
 519         if (playersao->checkMovementCheat()) {
 520                 // Call callbacks
 521                 m_script->on_cheat(playersao, "moved_too_fast");
 522                 SendMovePlayer(pkt->getPeerId());
 523         }
 524 }
 525
 526 void Server::handleCommand_PlayerPos(NetworkPacket* pkt)
 527 {
 528         session_t peer_id = pkt->getPeerId();
 529         RemotePlayer *player = m_env->getPlayer(peer_id);
 530         if (player == NULL) {
 531                 errorstream <<
 532                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
 533                         peer_id << " disconnecting peer!" << std::endl;
 534                 DisconnectPeer(peer_id);
 535                 return;
 536         }
 537
 538         PlayerSAO *playersao = player->getPlayerSAO();
 539         if (playersao == NULL) {
 540                 errorstream <<
 541                         "Server::ProcessData(): Canceling: No player object for peer_id=" <<
 542                         peer_id << " disconnecting peer!" << std::endl;
 543                 DisconnectPeer(peer_id);
 544                 return;
 545         }
 546
 547         // If player is dead we don't care of this packet
 548         if (playersao->isDead()) {
 549                 verbosestream << "TOSERVER_PLAYERPOS: " << player->getName()
 550                                 << " is dead. Ignoring packet";
 551                 return;
 552         }
 553
 554         process_PlayerPos(player, playersao, pkt);
 555 }
 556
 557 void Server::handleCommand_DeletedBlocks(NetworkPacket* pkt)
 558 {
 559         if (pkt->getSize() < 1)
 560                 return;
 561
 562         /*
 563                 [0] u16 command
 564                 [2] u8 count
 565                 [3] v3s16 pos_0
 566                 [3+6] v3s16 pos_1
 567                 ...
 568         */
 569
 570         u8 count;
 571         *pkt >> count;
 572
 573         RemoteClient *client = getClient(pkt->getPeerId());
 574
 575         if ((s16)pkt->getSize() < 1 + (int)count * 6) {
 576                 throw con::InvalidIncomingDataException
 577                                 ("DELETEDBLOCKS length is too short");
 578         }
 579
 580         for (u16 i = 0; i < count; i++) {
 581                 v3s16 p;
 582                 *pkt >> p;
 583                 client->SetBlockNotSent(p);
 584         }
 585 }
 586
 587 void Server::handleCommand_InventoryAction(NetworkPacket* pkt)
 588 {
 589         session_t peer_id = pkt->getPeerId();
 590         RemotePlayer *player = m_env->getPlayer(peer_id);
 591
 592         if (player == NULL) {
 593                 errorstream <<
 594                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
 595                         peer_id << " disconnecting peer!" << std::endl;
 596                 DisconnectPeer(peer_id);
 597                 return;
 598         }
 599
 600         PlayerSAO *playersao = player->getPlayerSAO();
 601         if (playersao == NULL) {
 602                 errorstream <<
 603                         "Server::ProcessData(): Canceling: No player object for peer_id=" <<
 604                         peer_id << " disconnecting peer!" << std::endl;
 605                 DisconnectPeer(peer_id);
 606                 return;
 607         }
 608
 609         // Strip command and create a stream
 610         std::string datastring(pkt->getString(0), pkt->getSize());
 611         verbosestream << "TOSERVER_INVENTORY_ACTION: data=" << datastring
 612                 << std::endl;
 613         std::istringstream is(datastring, std::ios_base::binary);
 614         // Create an action
 615         std::unique_ptr<InventoryAction> a(InventoryAction::deSerialize(is));
 616         if (!a) {
 617                 infostream << "TOSERVER_INVENTORY_ACTION: "
 618                                 << "InventoryAction::deSerialize() returned NULL"
 619                                 << std::endl;
 620                 return;
 621         }
 622
 623         // If something goes wrong, this player is to blame
 624         RollbackScopeActor rollback_scope(m_rollback,
 625                         std::string("player:")+player->getName());
 626
 627         /*
 628                 Note: Always set inventory not sent, to repair cases
 629                 where the client made a bad prediction.
 630         */
 631
 632         const bool player_has_interact = checkPriv(player->getName(), "interact");
 633
 634         auto check_inv_access = [player, player_has_interact, this] (
 635                         const InventoryLocation &loc) -> bool {
 636
 637                 // Players without interact may modify their own inventory
 638                 if (!player_has_interact && loc.type != InventoryLocation::PLAYER) {
 639                         infostream << "Cannot modify foreign inventory: "
 640                                         << "No interact privilege" << std::endl;
 641                         return false;
 642                 }
 643
 644                 switch (loc.type) {
 645                 case InventoryLocation::CURRENT_PLAYER:
 646                         // Only used internally on the client, never sent
 647                         return false;
 648                 case InventoryLocation::PLAYER:
 649                         // Allow access to own inventory in all cases
 650                         return loc.name == player->getName();
 651                 case InventoryLocation::NODEMETA:
 652                         {
 653                                 // Check for out-of-range interaction
 654                                 v3f node_pos   = intToFloat(loc.p, BS);
 655                                 v3f player_pos = player->getPlayerSAO()->getEyePosition();
 656                                 f32 d = player_pos.getDistanceFrom(node_pos);
 657                                 return checkInteractDistance(player, d, "inventory");
 658                         }
 659                 case InventoryLocation::DETACHED:
 660                         return getInventoryMgr()->checkDetachedInventoryAccess(loc, player->getName());
 661                 default:
 662                         return false;
 663                 }
 664         };
 665
 666         /*
 667                 Handle restrictions and special cases of the move action
 668         */
 669         if (a->getType() == IAction::Move) {
 670                 IMoveAction *ma = (IMoveAction*)a.get();
 671
 672                 ma->from_inv.applyCurrentPlayer(player->getName());
 673                 ma->to_inv.applyCurrentPlayer(player->getName());
 674
 675                 m_inventory_mgr->setInventoryModified(ma->from_inv);
 676                 if (ma->from_inv != ma->to_inv)
 677                         m_inventory_mgr->setInventoryModified(ma->to_inv);
 678
 679                 if (!check_inv_access(ma->from_inv) ||
 680                                 !check_inv_access(ma->to_inv))
 681                         return;
 682
 683                 /*
 684                         Disable moving items out of craftpreview
 685                 */
 686                 if (ma->from_list == "craftpreview") {
 687                         infostream << "Ignoring IMoveAction from "
 688                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 689                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 690                                         << " because src is " << ma->from_list << std::endl;
 691                         return;
 692                 }
 693
 694                 /*
 695                         Disable moving items into craftresult and craftpreview
 696                 */
 697                 if (ma->to_list == "craftpreview" || ma->to_list == "craftresult") {
 698                         infostream << "Ignoring IMoveAction from "
 699                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 700                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 701                                         << " because dst is " << ma->to_list << std::endl;
 702                         return;
 703                 }
 704         }
 705         /*
 706                 Handle restrictions and special cases of the drop action
 707         */
 708         else if (a->getType() == IAction::Drop) {
 709                 IDropAction *da = (IDropAction*)a.get();
 710
 711                 da->from_inv.applyCurrentPlayer(player->getName());
 712
 713                 m_inventory_mgr->setInventoryModified(da->from_inv);
 714
 715                 /*
 716                         Disable dropping items out of craftpreview
 717                 */
 718                 if (da->from_list == "craftpreview") {
 719                         infostream << "Ignoring IDropAction from "
 720                                         << (da->from_inv.dump()) << ":" << da->from_list
 721                                         << " because src is " << da->from_list << std::endl;
 722                         return;
 723                 }
 724
 725                 // Disallow dropping items if not allowed to interact
 726                 if (!player_has_interact || !check_inv_access(da->from_inv))
 727                         return;
 728
 729                 // Disallow dropping items if dead
 730                 if (playersao->isDead()) {
 731                         infostream << "Ignoring IDropAction from "
 732                                         << (da->from_inv.dump()) << ":" << da->from_list
 733                                         << " because player is dead." << std::endl;
 734                         return;
 735                 }
 736         }
 737         /*
 738                 Handle restrictions and special cases of the craft action
 739         */
 740         else if (a->getType() == IAction::Craft) {
 741                 ICraftAction *ca = (ICraftAction*)a.get();
 742
 743                 ca->craft_inv.applyCurrentPlayer(player->getName());
 744
 745                 m_inventory_mgr->setInventoryModified(ca->craft_inv);
 746
 747                 // Disallow crafting if not allowed to interact
 748                 if (!player_has_interact) {
 749                         infostream << "Cannot craft: "
 750                                         << "No interact privilege" << std::endl;
 751                         return;
 752                 }
 753
 754                 if (!check_inv_access(ca->craft_inv))
 755                         return;
 756         } else {
 757                 // Unknown action. Ignored.
 758                 return;
 759         }
 760
 761         // Do the action
 762         a->apply(m_inventory_mgr.get(), playersao, this);
 763 }
 764
 765 void Server::handleCommand_ChatMessage(NetworkPacket* pkt)
 766 {
 767         std::wstring message;
 768         *pkt >> message;
 769
 770         session_t peer_id = pkt->getPeerId();
 771         RemotePlayer *player = m_env->getPlayer(peer_id);
 772         if (player == NULL) {
 773                 errorstream <<
 774                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
 775                         peer_id << " disconnecting peer!" << std::endl;
 776                 DisconnectPeer(peer_id);
 777                 return;
 778         }
 779
 780         std::string name = player->getName();
 781
 782         std::wstring answer_to_sender = handleChat(name, message, true, player);
 783         if (!answer_to_sender.empty()) {
 784                 // Send the answer to sender
 785                 SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
 786                         answer_to_sender));
 787         }
 788 }
 789
 790 void Server::handleCommand_Damage(NetworkPacket* pkt)
 791 {
 792         u16 damage;
 793
 794         *pkt >> damage;
 795
 796         session_t peer_id = pkt->getPeerId();
 797         RemotePlayer *player = m_env->getPlayer(peer_id);
 798
 799         if (player == NULL) {
 800                 errorstream <<
 801                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
 802                         peer_id << " disconnecting peer!" << std::endl;
 803                 DisconnectPeer(peer_id);
 804                 return;
 805         }
 806
 807         PlayerSAO *playersao = player->getPlayerSAO();
 808         if (playersao == NULL) {
 809                 errorstream <<
 810                         "Server::ProcessData(): Canceling: No player object for peer_id=" <<
 811                         peer_id << " disconnecting peer!" << std::endl;
 812                 DisconnectPeer(peer_id);
 813                 return;
 814         }
 815
 816         if (!playersao->isImmortal()) {
 817                 if (playersao->isDead()) {
 818                         verbosestream << "Server::ProcessData(): Info: "
 819                                 "Ignoring damage as player " << player->getName()
 820                                 << " is already dead." << std::endl;
 821                         return;
 822                 }
 823
 824                 actionstream << player->getName() << " damaged by "
 825                                 << (int)damage << " hp at " << PP(playersao->getBasePosition() / BS)
 826                                 << std::endl;
 827
 828                 PlayerHPChangeReason reason(PlayerHPChangeReason::FALL);
 829                 playersao->setHP((s32)playersao->getHP() - (s32)damage, reason);
 830         }
 831 }
 832
 833 void Server::handleCommand_PlayerItem(NetworkPacket* pkt)
 834 {
 835         if (pkt->getSize() < 2)
 836                 return;
 837
 838         session_t peer_id = pkt->getPeerId();
 839         RemotePlayer *player = m_env->getPlayer(peer_id);
 840
 841         if (player == NULL) {
 842                 errorstream <<
 843                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
 844                         peer_id << " disconnecting peer!" << std::endl;
 845                 DisconnectPeer(peer_id);
 846                 return;
 847         }
 848
 849         PlayerSAO *playersao = player->getPlayerSAO();
 850         if (playersao == NULL) {
 851                 errorstream <<
 852                         "Server::ProcessData(): Canceling: No player object for peer_id=" <<
 853                         peer_id << " disconnecting peer!" << std::endl;
 854                 DisconnectPeer(peer_id);
 855                 return;
 856         }
 857
 858         u16 item;
 859
 860         *pkt >> item;
 861
 862         if (item >= player->getHotbarItemcount()) {
 863                 actionstream << "Player: " << player->getName()
 864                         << " tried to access item=" << item
 865                         << " out of hotbar_itemcount="
 866                         << player->getHotbarItemcount()
 867                         << "; ignoring." << std::endl;
 868                 return;
 869         }
 870
 871         playersao->getPlayer()->setWieldIndex(item);
 872 }
 873
 874 void Server::handleCommand_Respawn(NetworkPacket* pkt)
 875 {
 876         session_t peer_id = pkt->getPeerId();
 877         RemotePlayer *player = m_env->getPlayer(peer_id);
 878         if (player == NULL) {
 879                 errorstream <<
 880                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
 881                         peer_id << " disconnecting peer!" << std::endl;
 882                 DisconnectPeer(peer_id);
 883                 return;
 884         }
 885
 886         PlayerSAO *playersao = player->getPlayerSAO();
 887         assert(playersao);
 888
 889         if (!playersao->isDead())
 890                 return;
 891
 892         RespawnPlayer(peer_id);
 893
 894         actionstream << player->getName() << " respawns at "
 895                         << PP(playersao->getBasePosition() / BS) << std::endl;
 896
 897         // ActiveObject is added to environment in AsyncRunStep after
 898         // the previous addition has been successfully removed
 899 }
 900
 901 bool Server::checkInteractDistance(RemotePlayer *player, const f32 d, const std::string &what)
 902 {
 903         ItemStack selected_item, hand_item;
 904         player->getWieldedItem(&selected_item, &hand_item);
 905         f32 max_d = BS * getToolRange(selected_item.getDefinition(m_itemdef),
 906                         hand_item.getDefinition(m_itemdef));
 907
 908         // Cube diagonal * 1.5 for maximal supported node extents:
 909         // sqrt(3) * 1.5 ≅ 2.6
 910         if (d > max_d + 2.6f * BS) {
 911                 actionstream << "Player " << player->getName()
 912                                 << " tried to access " << what
 913                                 << " from too far: "
 914                                 << "d=" << d << ", max_d=" << max_d
 915                                 << "; ignoring." << std::endl;
 916                 // Call callbacks
 917                 m_script->on_cheat(player->getPlayerSAO(), "interacted_too_far");
 918                 return false;
 919         }
 920         return true;
 921 }
 922
 923 void Server::handleCommand_Interact(NetworkPacket *pkt)
 924 {
 925         /*
 926                 [0] u16 command
 927                 [2] u8 action
 928                 [3] u16 item
 929                 [5] u32 length of the next item (plen)
 930                 [9] serialized PointedThing
 931                 [9 + plen] player position information
 932         */
 933
 934         InteractAction action;
 935         u16 item_i;
 936
 937         *pkt >> (u8 &)action;
 938         *pkt >> item_i;
 939
 940         std::istringstream tmp_is(pkt->readLongString(), std::ios::binary);
 941         PointedThing pointed;
 942         pointed.deSerialize(tmp_is);
 943
 944         verbosestream << "TOSERVER_INTERACT: action=" << (int)action << ", item="
 945                         << item_i << ", pointed=" << pointed.dump() << std::endl;
 946
 947         session_t peer_id = pkt->getPeerId();
 948         RemotePlayer *player = m_env->getPlayer(peer_id);
 949
 950         if (player == NULL) {
 951                 errorstream <<
 952                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
 953                         peer_id << " disconnecting peer!" << std::endl;
 954                 DisconnectPeer(peer_id);
 955                 return;
 956         }
 957
 958         PlayerSAO *playersao = player->getPlayerSAO();
 959         if (playersao == NULL) {
 960                 errorstream <<
 961                         "Server::ProcessData(): Canceling: No player object for peer_id=" <<
 962                         peer_id << " disconnecting peer!" << std::endl;
 963                 DisconnectPeer(peer_id);
 964                 return;
 965         }
 966
 967         if (playersao->isDead()) {
 968                 actionstream << "Server: " << player->getName()
 969                                 << " tried to interact while dead; ignoring." << std::endl;
 970                 if (pointed.type == POINTEDTHING_NODE) {
 971                         // Re-send block to revert change on client-side
 972                         RemoteClient *client = getClient(peer_id);
 973                         v3s16 blockpos = getNodeBlockPos(pointed.node_undersurface);
 974                         client->SetBlockNotSent(blockpos);
 975                 }
 976                 // Call callbacks
 977                 m_script->on_cheat(playersao, "interacted_while_dead");
 978                 return;
 979         }
 980
 981         process_PlayerPos(player, playersao, pkt);
 982
 983         v3f player_pos = playersao->getLastGoodPosition();
 984
 985         // Update wielded item
 986
 987         if (item_i >= player->getHotbarItemcount()) {
 988                 actionstream << "Player: " << player->getName()
 989                         << " tried to access item=" << item_i
 990                         << " out of hotbar_itemcount="
 991                         << player->getHotbarItemcount()
 992                         << "; ignoring." << std::endl;
 993                 return;
 994         }
 995
 996         playersao->getPlayer()->setWieldIndex(item_i);
 997
 998         // Get pointed to object (NULL if not POINTEDTYPE_OBJECT)
 999         ServerActiveObject *pointed_object = NULL;
1000         if (pointed.type == POINTEDTHING_OBJECT) {
1001                 pointed_object = m_env->getActiveObject(pointed.object_id);
1002                 if (pointed_object == NULL) {
1003                         verbosestream << "TOSERVER_INTERACT: "
1004                                 "pointed object is NULL" << std::endl;
1005                         return;
1006                 }
1007
1008         }
1009
1010         /*
1011                 Make sure the player is allowed to do it
1012         */
1013         if (!checkPriv(player->getName(), "interact")) {
1014                 actionstream << player->getName() << " attempted to interact with " <<
1015                                 pointed.dump() << " without 'interact' privilege" << std::endl;
1016
1017                 if (pointed.type != POINTEDTHING_NODE)
1018                         return;
1019
1020                 // Re-send block to revert change on client-side
1021                 RemoteClient *client = getClient(peer_id);
1022                 // Digging completed -> under
1023                 if (action == INTERACT_DIGGING_COMPLETED) {
1024                         v3s16 blockpos = getNodeBlockPos(pointed.node_undersurface);
1025                         client->SetBlockNotSent(blockpos);
1026                 }
1027                 // Placement -> above
1028                 else if (action == INTERACT_PLACE) {
1029                         v3s16 blockpos = getNodeBlockPos(pointed.node_abovesurface);
1030                         client->SetBlockNotSent(blockpos);
1031                 }
1032                 return;
1033         }
1034
1035         /*
1036                 Check that target is reasonably close
1037         */
1038         static thread_local const bool enable_anticheat =
1039                         !g_settings->getBool("disable_anticheat");
1040
1041         if ((action == INTERACT_START_DIGGING || action == INTERACT_DIGGING_COMPLETED ||
1042                         action == INTERACT_PLACE || action == INTERACT_USE) &&
1043                         enable_anticheat && !isSingleplayer()) {
1044                 v3f target_pos = player_pos;
1045                 if (pointed.type == POINTEDTHING_NODE) {
1046                         target_pos = intToFloat(pointed.node_undersurface, BS);
1047                 } else if (pointed.type == POINTEDTHING_OBJECT) {
1048                         if (playersao->getId() == pointed_object->getId()) {
1049                                 actionstream << "Server: " << player->getName()
1050                                         << " attempted to interact with themselves" << std::endl;
1051                                 m_script->on_cheat(playersao, "interacted_with_self");
1052                                 return;
1053                         }
1054                         target_pos = pointed_object->getBasePosition();
1055                 }
1056                 float d = playersao->getEyePosition().getDistanceFrom(target_pos);
1057
1058                 if (!checkInteractDistance(player, d, pointed.dump())) {
1059                         if (pointed.type == POINTEDTHING_NODE) {
1060                                 // Re-send block to revert change on client-side
1061                                 RemoteClient *client = getClient(peer_id);
1062                                 v3s16 blockpos = getNodeBlockPos(pointed.node_undersurface);
1063                                 client->SetBlockNotSent(blockpos);
1064                         }
1065                         return;
1066                 }
1067         }
1068
1069         /*
1070                 If something goes wrong, this player is to blame
1071         */
1072         RollbackScopeActor rollback_scope(m_rollback,
1073                         std::string("player:")+player->getName());
1074
1075         switch (action) {
1076         // Start digging or punch object
1077         case INTERACT_START_DIGGING: {
1078                 if (pointed.type == POINTEDTHING_NODE) {
1079                         MapNode n(CONTENT_IGNORE);
1080                         bool pos_ok;
1081
1082                         v3s16 p_under = pointed.node_undersurface;
1083                         n = m_env->getMap().getNode(p_under, &pos_ok);
1084                         if (!pos_ok) {
1085                                 infostream << "Server: Not punching: Node not found. "
1086                                         "Adding block to emerge queue." << std::endl;
1087                                 m_emerge->enqueueBlockEmerge(peer_id,
1088                                         getNodeBlockPos(pointed.node_abovesurface), false);
1089                         }
1090
1091                         if (n.getContent() != CONTENT_IGNORE)
1092                                 m_script->node_on_punch(p_under, n, playersao, pointed);
1093
1094                         // Cheat prevention
1095                         playersao->noCheatDigStart(p_under);
1096
1097                         return;
1098                 }
1099
1100                 // Skip if the object can't be interacted with anymore
1101                 if (pointed.type != POINTEDTHING_OBJECT || pointed_object->isGone())
1102                         return;
1103
1104                 ItemStack selected_item, hand_item;
1105                 ItemStack tool_item = playersao->getWieldedItem(&selected_item, &hand_item);
1106                 ToolCapabilities toolcap =
1107                                 tool_item.getToolCapabilities(m_itemdef);
1108                 v3f dir = (pointed_object->getBasePosition() -
1109                                 (playersao->getBasePosition() + playersao->getEyeOffset())
1110                                         ).normalize();
1111                 float time_from_last_punch =
1112                         playersao->resetTimeFromLastPunch();
1113
1114                 u16 wear = pointed_object->punch(dir, &toolcap, playersao,
1115                                 time_from_last_punch);
1116
1117                 // Callback may have changed item, so get it again
1118                 playersao->getWieldedItem(&selected_item);
1119                 bool changed = selected_item.addWear(wear, m_itemdef);
1120                 if (changed)
1121                         playersao->setWieldedItem(selected_item);
1122
1123                 return;
1124         } // action == INTERACT_START_DIGGING
1125
1126         case INTERACT_STOP_DIGGING:
1127                 // Nothing to do
1128                 return;
1129
1130         case INTERACT_DIGGING_COMPLETED: {
1131                 // Only digging of nodes
1132                 if (pointed.type != POINTEDTHING_NODE)
1133                         return;
1134                 bool pos_ok;
1135                 v3s16 p_under = pointed.node_undersurface;
1136                 MapNode n = m_env->getMap().getNode(p_under, &pos_ok);
1137                 if (!pos_ok) {
1138                         infostream << "Server: Not finishing digging: Node not found. "
1139                                 "Adding block to emerge queue." << std::endl;
1140                         m_emerge->enqueueBlockEmerge(peer_id,
1141                                 getNodeBlockPos(pointed.node_abovesurface), false);
1142                 }
1143
1144                 /* Cheat prevention */
1145                 bool is_valid_dig = true;
1146                 if (enable_anticheat && !isSingleplayer()) {
1147                         v3s16 nocheat_p = playersao->getNoCheatDigPos();
1148                         float nocheat_t = playersao->getNoCheatDigTime();
1149                         playersao->noCheatDigEnd();
1150                         // If player didn't start digging this, ignore dig
1151                         if (nocheat_p != p_under) {
1152                                 infostream << "Server: " << player->getName()
1153                                                 << " started digging "
1154                                                 << PP(nocheat_p) << " and completed digging "
1155                                                 << PP(p_under) << "; not digging." << std::endl;
1156                                 is_valid_dig = false;
1157                                 // Call callbacks
1158                                 m_script->on_cheat(playersao, "finished_unknown_dig");
1159                         }
1160
1161                         // Get player's wielded item
1162                         // See also: Game::handleDigging
1163                         ItemStack selected_item, hand_item;
1164                         playersao->getPlayer()->getWieldedItem(&selected_item, &hand_item);
1165
1166                         // Get diggability and expected digging time
1167                         DigParams params = getDigParams(m_nodedef->get(n).groups,
1168                                         &selected_item.getToolCapabilities(m_itemdef));
1169                         // If can't dig, try hand
1170                         if (!params.diggable) {
1171                                 params = getDigParams(m_nodedef->get(n).groups,
1172                                         &hand_item.getToolCapabilities(m_itemdef));
1173                         }
1174                         // If can't dig, ignore dig
1175                         if (!params.diggable) {
1176                                 infostream << "Server: " << player->getName()
1177                                                 << " completed digging " << PP(p_under)
1178                                                 << ", which is not diggable with tool; not digging."
1179                                                 << std::endl;
1180                                 is_valid_dig = false;
1181                                 // Call callbacks
1182                                 m_script->on_cheat(playersao, "dug_unbreakable");
1183                         }
1184                         // Check digging time
1185                         // If already invalidated, we don't have to
1186                         if (!is_valid_dig) {
1187                                 // Well not our problem then
1188                         }
1189                         // Clean and long dig
1190                         else if (params.time > 2.0 && nocheat_t * 1.2 > params.time) {
1191                                 // All is good, but grab time from pool; don't care if
1192                                 // it's actually available
1193                                 playersao->getDigPool().grab(params.time);
1194                         }
1195                         // Short or laggy dig
1196                         // Try getting the time from pool
1197                         else if (playersao->getDigPool().grab(params.time)) {
1198                                 // All is good
1199                         }
1200                         // Dig not possible
1201                         else {
1202                                 infostream << "Server: " << player->getName()
1203                                                 << " completed digging " << PP(p_under)
1204                                                 << "too fast; not digging." << std::endl;
1205                                 is_valid_dig = false;
1206                                 // Call callbacks
1207                                 m_script->on_cheat(playersao, "dug_too_fast");
1208                         }
1209                 }
1210
1211                 /* Actually dig node */
1212
1213                 if (is_valid_dig && n.getContent() != CONTENT_IGNORE)
1214                         m_script->node_on_dig(p_under, n, playersao);
1215
1216                 v3s16 blockpos = getNodeBlockPos(p_under);
1217                 RemoteClient *client = getClient(peer_id);
1218                 // Send unusual result (that is, node not being removed)
1219                 if (m_env->getMap().getNode(p_under).getContent() != CONTENT_AIR)
1220                         // Re-send block to revert change on client-side
1221                         client->SetBlockNotSent(blockpos);
1222                 else
1223                         client->ResendBlockIfOnWire(blockpos);
1224
1225                 return;
1226         } // action == INTERACT_DIGGING_COMPLETED
1227
1228         // Place block or right-click object
1229         case INTERACT_PLACE: {
1230                 ItemStack selected_item;
1231                 playersao->getWieldedItem(&selected_item, nullptr);
1232
1233                 // Reset build time counter
1234                 if (pointed.type == POINTEDTHING_NODE &&
1235                                 selected_item.getDefinition(m_itemdef).type == ITEM_NODE)
1236                         getClient(peer_id)->m_time_from_building = 0.0;
1237
1238                 if (pointed.type == POINTEDTHING_OBJECT) {
1239                         // Right click object
1240
1241                         // Skip if object can't be interacted with anymore
1242                         if (pointed_object->isGone())
1243                                 return;
1244
1245                         actionstream << player->getName() << " right-clicks object "
1246                                         << pointed.object_id << ": "
1247                                         << pointed_object->getDescription() << std::endl;
1248
1249                         // Do stuff
1250                         if (m_script->item_OnSecondaryUse(
1251                                         selected_item, playersao, pointed)) {
1252                                 if (playersao->setWieldedItem(selected_item)) {
1253                                         SendInventory(playersao, true);
1254                                 }
1255                         }
1256
1257                         pointed_object->rightClick(playersao);
1258                 } else if (m_script->item_OnPlace(selected_item, playersao, pointed)) {
1259                         // Placement was handled in lua
1260
1261                         // Apply returned ItemStack
1262                         if (playersao->setWieldedItem(selected_item))
1263                                 SendInventory(playersao, true);
1264                 }
1265
1266                 if (pointed.type != POINTEDTHING_NODE)
1267                         return;
1268
1269                 // If item has node placement prediction, always send the
1270                 // blocks to make sure the client knows what exactly happened
1271                 RemoteClient *client = getClient(peer_id);
1272                 v3s16 blockpos = getNodeBlockPos(pointed.node_abovesurface);
1273                 v3s16 blockpos2 = getNodeBlockPos(pointed.node_undersurface);
1274                 if (!selected_item.getDefinition(m_itemdef
1275                                 ).node_placement_prediction.empty()) {
1276                         client->SetBlockNotSent(blockpos);
1277                         if (blockpos2 != blockpos)
1278                                 client->SetBlockNotSent(blockpos2);
1279                 } else {
1280                         client->ResendBlockIfOnWire(blockpos);
1281                         if (blockpos2 != blockpos)
1282                                 client->ResendBlockIfOnWire(blockpos2);
1283                 }
1284
1285                 return;
1286         } // action == INTERACT_PLACE
1287
1288         case INTERACT_USE: {
1289                 ItemStack selected_item;
1290                 playersao->getWieldedItem(&selected_item, nullptr);
1291
1292                 actionstream << player->getName() << " uses " << selected_item.name
1293                                 << ", pointing at " << pointed.dump() << std::endl;
1294
1295                 if (m_script->item_OnUse(selected_item, playersao, pointed)) {
1296                         // Apply returned ItemStack
1297                         if (playersao->setWieldedItem(selected_item))
1298                                 SendInventory(playersao, true);
1299                 }
1300
1301                 return;
1302         }
1303
1304         // Rightclick air
1305         case INTERACT_ACTIVATE: {
1306                 ItemStack selected_item;
1307                 playersao->getWieldedItem(&selected_item, nullptr);
1308
1309                 actionstream << player->getName() << " activates "
1310                                 << selected_item.name << std::endl;
1311
1312                 pointed.type = POINTEDTHING_NOTHING; // can only ever be NOTHING
1313
1314                 if (m_script->item_OnSecondaryUse(selected_item, playersao, pointed)) {
1315                         if (playersao->setWieldedItem(selected_item))
1316                                 SendInventory(playersao, true);
1317                 }
1318
1319                 return;
1320         }
1321
1322         default:
1323                 warningstream << "Server: Invalid action " << action << std::endl;
1324
1325         }
1326 }
1327
1328 void Server::handleCommand_RemovedSounds(NetworkPacket* pkt)
1329 {
1330         u16 num;
1331         *pkt >> num;
1332         for (u16 k = 0; k < num; k++) {
1333                 s32 id;
1334
1335                 *pkt >> id;
1336
1337                 std::unordered_map<s32, ServerPlayingSound>::iterator i =
1338                         m_playing_sounds.find(id);
1339                 if (i == m_playing_sounds.end())
1340                         continue;
1341
1342                 ServerPlayingSound &psound = i->second;
1343                 psound.clients.erase(pkt->getPeerId());
1344                 if (psound.clients.empty())
1345                         m_playing_sounds.erase(i++);
1346         }
1347 }
1348
1349 void Server::handleCommand_NodeMetaFields(NetworkPacket* pkt)
1350 {
1351         v3s16 p;
1352         std::string formname;
1353         u16 num;
1354
1355         *pkt >> p >> formname >> num;
1356
1357         StringMap fields;
1358         for (u16 k = 0; k < num; k++) {
1359                 std::string fieldname;
1360                 *pkt >> fieldname;
1361                 fields[fieldname] = pkt->readLongString();
1362         }
1363
1364         session_t peer_id = pkt->getPeerId();
1365         RemotePlayer *player = m_env->getPlayer(peer_id);
1366
1367         if (player == NULL) {
1368                 errorstream <<
1369                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
1370                         peer_id << " disconnecting peer!" << std::endl;
1371                 DisconnectPeer(peer_id);
1372                 return;
1373         }
1374
1375         PlayerSAO *playersao = player->getPlayerSAO();
1376         if (playersao == NULL) {
1377                 errorstream <<
1378                         "Server::ProcessData(): Canceling: No player object for peer_id=" <<
1379                         peer_id << " disconnecting peer!" << std::endl;
1380                 DisconnectPeer(peer_id);
1381                 return;
1382         }
1383
1384         // If something goes wrong, this player is to blame
1385         RollbackScopeActor rollback_scope(m_rollback,
1386                         std::string("player:")+player->getName());
1387
1388         // Check the target node for rollback data; leave others unnoticed
1389         RollbackNode rn_old(&m_env->getMap(), p, this);
1390
1391         m_script->node_on_receive_fields(p, formname, fields, playersao);
1392
1393         // Report rollback data
1394         RollbackNode rn_new(&m_env->getMap(), p, this);
1395         if (rollback() && rn_new != rn_old) {
1396                 RollbackAction action;
1397                 action.setSetNode(p, rn_old, rn_new);
1398                 rollback()->reportAction(action);
1399         }
1400 }
1401
1402 void Server::handleCommand_InventoryFields(NetworkPacket* pkt)
1403 {
1404         std::string client_formspec_name;
1405         u16 num;
1406
1407         *pkt >> client_formspec_name >> num;
1408
1409         StringMap fields;
1410         for (u16 k = 0; k < num; k++) {
1411                 std::string fieldname;
1412                 *pkt >> fieldname;
1413                 fields[fieldname] = pkt->readLongString();
1414         }
1415
1416         session_t peer_id = pkt->getPeerId();
1417         RemotePlayer *player = m_env->getPlayer(peer_id);
1418
1419         if (player == NULL) {
1420                 errorstream <<
1421                         "Server::ProcessData(): Canceling: No player for peer_id=" <<
1422                         peer_id << " disconnecting peer!" << std::endl;
1423                 DisconnectPeer(peer_id);
1424                 return;
1425         }
1426
1427         PlayerSAO *playersao = player->getPlayerSAO();
1428         if (playersao == NULL) {
1429                 errorstream <<
1430                         "Server::ProcessData(): Canceling: No player object for peer_id=" <<
1431                         peer_id << " disconnecting peer!" << std::endl;
1432                 DisconnectPeer(peer_id);
1433                 return;
1434         }
1435
1436         if (client_formspec_name.empty()) { // pass through inventory submits
1437                 m_script->on_playerReceiveFields(playersao, client_formspec_name, fields);
1438                 return;
1439         }
1440
1441         // verify that we displayed the formspec to the user
1442         const auto peer_state_iterator = m_formspec_state_data.find(peer_id);
1443         if (peer_state_iterator != m_formspec_state_data.end()) {
1444                 const std::string &server_formspec_name = peer_state_iterator->second;
1445                 if (client_formspec_name == server_formspec_name) {
1446                         auto it = fields.find("quit");
1447                         if (it != fields.end() && it->second == "true")
1448                                 m_formspec_state_data.erase(peer_state_iterator);
1449
1450                         m_script->on_playerReceiveFields(playersao, client_formspec_name, fields);
1451                         return;
1452                 }
1453                 actionstream << "'" << player->getName()
1454                         << "' submitted formspec ('" << client_formspec_name
1455                         << "') but the name of the formspec doesn't match the"
1456                         " expected name ('" << server_formspec_name << "')";
1457
1458         } else {
1459                 actionstream << "'" << player->getName()
1460                         << "' submitted formspec ('" << client_formspec_name
1461                         << "') but server hasn't sent formspec to client";
1462         }
1463         actionstream << ", possible exploitation attempt" << std::endl;
1464 }
1465
1466 void Server::handleCommand_FirstSrp(NetworkPacket* pkt)
1467 {
1468         session_t peer_id = pkt->getPeerId();
1469         RemoteClient *client = getClient(peer_id, CS_Invalid);
1470         ClientState cstate = client->getState();
1471
1472         std::string playername = client->getName();
1473
1474         std::string salt;
1475         std::string verification_key;
1476
1477         std::string addr_s = getPeerAddress(peer_id).serializeString();
1478         u8 is_empty;
1479
1480         *pkt >> salt >> verification_key >> is_empty;
1481
1482         verbosestream << "Server: Got TOSERVER_FIRST_SRP from " << addr_s
1483                 << ", with is_empty=" << (is_empty == 1) << std::endl;
1484
1485         // Either this packet is sent because the user is new or to change the password
1486         if (cstate == CS_HelloSent) {
1487                 if (!client->isMechAllowed(AUTH_MECHANISM_FIRST_SRP)) {
1488                         actionstream << "Server: Client from " << addr_s
1489                                         << " tried to set password without being "
1490                                         << "authenticated, or the username being new." << std::endl;
1491                         DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1492                         return;
1493                 }
1494
1495                 if (!isSingleplayer() &&
1496                                 g_settings->getBool("disallow_empty_password") &&
1497                                 is_empty == 1) {
1498                         actionstream << "Server: " << playername
1499                                         << " supplied empty password from " << addr_s << std::endl;
1500                         DenyAccess(peer_id, SERVER_ACCESSDENIED_EMPTY_PASSWORD);
1501                         return;
1502                 }
1503
1504                 std::string initial_ver_key;
1505
1506                 initial_ver_key = encode_srp_verifier(verification_key, salt);
1507                 m_script->createAuth(playername, initial_ver_key);
1508                 m_script->on_authplayer(playername, addr_s, true);
1509
1510                 acceptAuth(peer_id, false);
1511         } else {
1512                 if (cstate < CS_SudoMode) {
1513                         infostream << "Server::ProcessData(): Ignoring TOSERVER_FIRST_SRP from "
1514                                         << addr_s << ": " << "Client has wrong state " << cstate << "."
1515                                         << std::endl;
1516                         return;
1517                 }
1518                 m_clients.event(peer_id, CSE_SudoLeave);
1519                 std::string pw_db_field = encode_srp_verifier(verification_key, salt);
1520                 bool success = m_script->setPassword(playername, pw_db_field);
1521                 if (success) {
1522                         actionstream << playername << " changes password" << std::endl;
1523                         SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
1524                                 L"Password change successful."));
1525                 } else {
1526                         actionstream << playername <<
1527                                 " tries to change password but it fails" << std::endl;
1528                         SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
1529                                 L"Password change failed or unavailable."));
1530                 }
1531         }
1532 }
1533
1534 void Server::handleCommand_SrpBytesA(NetworkPacket* pkt)
1535 {
1536         session_t peer_id = pkt->getPeerId();
1537         RemoteClient *client = getClient(peer_id, CS_Invalid);
1538         ClientState cstate = client->getState();
1539
1540         bool wantSudo = (cstate == CS_Active);
1541
1542         if (!((cstate == CS_HelloSent) || (cstate == CS_Active))) {
1543                 actionstream << "Server: got SRP _A packet in wrong state " << cstate <<
1544                         " from " << getPeerAddress(peer_id).serializeString() <<
1545                         ". Ignoring." << std::endl;
1546                 return;
1547         }
1548
1549         if (client->chosen_mech != AUTH_MECHANISM_NONE) {
1550                 actionstream << "Server: got SRP _A packet, while auth is already "
1551                         "going on with mech " << client->chosen_mech << " from " <<
1552                         getPeerAddress(peer_id).serializeString() <<
1553                         " (wantSudo=" << wantSudo << "). Ignoring." << std::endl;
1554                 if (wantSudo) {
1555                         DenySudoAccess(peer_id);
1556                         return;
1557                 }
1558
1559                 DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1560                 return;
1561         }
1562
1563         std::string bytes_A;
1564         u8 based_on;
1565         *pkt >> bytes_A >> based_on;
1566
1567         infostream << "Server: TOSERVER_SRP_BYTES_A received with "
1568                 << "based_on=" << int(based_on) << " and len_A="
1569                 << bytes_A.length() << "." << std::endl;
1570
1571         AuthMechanism chosen = (based_on == 0) ?
1572                 AUTH_MECHANISM_LEGACY_PASSWORD : AUTH_MECHANISM_SRP;
1573
1574         if (wantSudo) {
1575                 if (!client->isSudoMechAllowed(chosen)) {
1576                         actionstream << "Server: Player \"" << client->getName() <<
1577                                 "\" at " << getPeerAddress(peer_id).serializeString() <<
1578                                 " tried to change password using unallowed mech " << chosen <<
1579                                 "." << std::endl;
1580                         DenySudoAccess(peer_id);
1581                         return;
1582                 }
1583         } else {
1584                 if (!client->isMechAllowed(chosen)) {
1585                         actionstream << "Server: Client tried to authenticate from " <<
1586                                 getPeerAddress(peer_id).serializeString() <<
1587                                 " using unallowed mech " << chosen << "." << std::endl;
1588                         DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1589                         return;
1590                 }
1591         }
1592
1593         client->chosen_mech = chosen;
1594
1595         std::string salt;
1596         std::string verifier;
1597
1598         if (based_on == 0) {
1599
1600                 generate_srp_verifier_and_salt(client->getName(), client->enc_pwd,
1601                         &verifier, &salt);
1602         } else if (!decode_srp_verifier_and_salt(client->enc_pwd, &verifier, &salt)) {
1603                 // Non-base64 errors should have been catched in the init handler
1604                 actionstream << "Server: User " << client->getName() <<
1605                         " tried to log in, but srp verifier field was invalid (most likely "
1606                         "invalid base64)." << std::endl;
1607                 DenyAccess(peer_id, SERVER_ACCESSDENIED_SERVER_FAIL);
1608                 return;
1609         }
1610
1611         char *bytes_B = 0;
1612         size_t len_B = 0;
1613
1614         client->auth_data = srp_verifier_new(SRP_SHA256, SRP_NG_2048,
1615                 client->getName().c_str(),
1616                 (const unsigned char *) salt.c_str(), salt.size(),
1617                 (const unsigned char *) verifier.c_str(), verifier.size(),
1618                 (const unsigned char *) bytes_A.c_str(), bytes_A.size(),
1619                 NULL, 0,
1620                 (unsigned char **) &bytes_B, &len_B, NULL, NULL);
1621
1622         if (!bytes_B) {
1623                 actionstream << "Server: User " << client->getName()
1624                         << " tried to log in, SRP-6a safety check violated in _A handler."
1625                         << std::endl;
1626                 if (wantSudo) {
1627                         DenySudoAccess(peer_id);
1628                         return;
1629                 }
1630
1631                 DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1632                 return;
1633         }
1634
1635         NetworkPacket resp_pkt(TOCLIENT_SRP_BYTES_S_B, 0, peer_id);
1636         resp_pkt << salt << std::string(bytes_B, len_B);
1637         Send(&resp_pkt);
1638 }
1639
1640 void Server::handleCommand_SrpBytesM(NetworkPacket* pkt)
1641 {
1642         session_t peer_id = pkt->getPeerId();
1643         RemoteClient *client = getClient(peer_id, CS_Invalid);
1644         ClientState cstate = client->getState();
1645         std::string addr_s = getPeerAddress(pkt->getPeerId()).serializeString();
1646         std::string playername = client->getName();
1647
1648         bool wantSudo = (cstate == CS_Active);
1649
1650         verbosestream << "Server: Received TOSERVER_SRP_BYTES_M." << std::endl;
1651
1652         if (!((cstate == CS_HelloSent) || (cstate == CS_Active))) {
1653                 warningstream << "Server: got SRP_M packet in wrong state "
1654                         << cstate << " from " << addr_s << ". Ignoring." << std::endl;
1655                 return;
1656         }
1657
1658         if (client->chosen_mech != AUTH_MECHANISM_SRP &&
1659                         client->chosen_mech != AUTH_MECHANISM_LEGACY_PASSWORD) {
1660                 warningstream << "Server: got SRP_M packet, while auth "
1661                         "is going on with mech " << client->chosen_mech << " from "
1662                         << addr_s << " (wantSudo=" << wantSudo << "). Denying." << std::endl;
1663                 if (wantSudo) {
1664                         DenySudoAccess(peer_id);
1665                         return;
1666                 }
1667
1668                 DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1669                 return;
1670         }
1671
1672         std::string bytes_M;
1673         *pkt >> bytes_M;
1674
1675         if (srp_verifier_get_session_key_length((SRPVerifier *) client->auth_data)
1676                         != bytes_M.size()) {
1677                 actionstream << "Server: User " << playername << " at " << addr_s
1678                         << " sent bytes_M with invalid length " << bytes_M.size() << std::endl;
1679                 DenyAccess(peer_id, SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1680                 return;
1681         }
1682
1683         unsigned char *bytes_HAMK = 0;
1684
1685         srp_verifier_verify_session((SRPVerifier *) client->auth_data,
1686                 (unsigned char *)bytes_M.c_str(), &bytes_HAMK);
1687
1688         if (!bytes_HAMK) {
1689                 if (wantSudo) {
1690                         actionstream << "Server: User " << playername << " at " << addr_s
1691                                 << " tried to change their password, but supplied wrong"
1692                                 << " (SRP) password for authentication." << std::endl;
1693                         DenySudoAccess(peer_id);
1694                         return;
1695                 }
1696
1697                 actionstream << "Server: User " << playername << " at " << addr_s
1698                         << " supplied wrong password (auth mechanism: SRP)." << std::endl;
1699                 m_script->on_authplayer(playername, addr_s, false);
1700                 DenyAccess(peer_id, SERVER_ACCESSDENIED_WRONG_PASSWORD);
1701                 return;
1702         }
1703
1704         if (client->create_player_on_auth_success) {
1705                 m_script->createAuth(playername, client->enc_pwd);
1706
1707                 std::string checkpwd; // not used, but needed for passing something
1708                 if (!m_script->getAuth(playername, &checkpwd, NULL)) {
1709                         errorstream << "Server: " << playername <<
1710                                 " cannot be authenticated (auth handler does not work?)" <<
1711                                 std::endl;
1712                         DenyAccess(peer_id, SERVER_ACCESSDENIED_SERVER_FAIL);
1713                         return;
1714                 }
1715                 client->create_player_on_auth_success = false;
1716         }
1717
1718         m_script->on_authplayer(playername, addr_s, true);
1719         acceptAuth(peer_id, wantSudo);
1720 }
1721
1722 /*
1723  * Mod channels
1724  */
1725
1726 void Server::handleCommand_ModChannelJoin(NetworkPacket *pkt)
1727 {
1728         std::string channel_name;
1729         *pkt >> channel_name;
1730
1731         session_t peer_id = pkt->getPeerId();
1732         NetworkPacket resp_pkt(TOCLIENT_MODCHANNEL_SIGNAL,
1733                 1 + 2 + channel_name.size(), peer_id);
1734
1735         // Send signal to client to notify join succeed or not
1736         if (g_settings->getBool("enable_mod_channels") &&
1737                         m_modchannel_mgr->joinChannel(channel_name, peer_id)) {
1738                 resp_pkt << (u8) MODCHANNEL_SIGNAL_JOIN_OK;
1739                 infostream << "Peer " << peer_id << " joined channel " <<
1740                         channel_name << std::endl;
1741         }
1742         else {
1743                 resp_pkt << (u8)MODCHANNEL_SIGNAL_JOIN_FAILURE;
1744                 infostream << "Peer " << peer_id << " tried to join channel " <<
1745                         channel_name << ", but was already registered." << std::endl;
1746         }
1747         resp_pkt << channel_name;
1748         Send(&resp_pkt);
1749 }
1750
1751 void Server::handleCommand_ModChannelLeave(NetworkPacket *pkt)
1752 {
1753         std::string channel_name;
1754         *pkt >> channel_name;
1755
1756         session_t peer_id = pkt->getPeerId();
1757         NetworkPacket resp_pkt(TOCLIENT_MODCHANNEL_SIGNAL,
1758                 1 + 2 + channel_name.size(), peer_id);
1759
1760         // Send signal to client to notify join succeed or not
1761         if (g_settings->getBool("enable_mod_channels") &&
1762                         m_modchannel_mgr->leaveChannel(channel_name, peer_id)) {
1763                 resp_pkt << (u8)MODCHANNEL_SIGNAL_LEAVE_OK;
1764                 infostream << "Peer " << peer_id << " left channel " << channel_name <<
1765                         std::endl;
1766         } else {
1767                 resp_pkt << (u8) MODCHANNEL_SIGNAL_LEAVE_FAILURE;
1768                 infostream << "Peer " << peer_id << " left channel " << channel_name <<
1769                         ", but was not registered." << std::endl;
1770         }
1771         resp_pkt << channel_name;
1772         Send(&resp_pkt);
1773 }
1774
1775 void Server::handleCommand_ModChannelMsg(NetworkPacket *pkt)
1776 {
1777         std::string channel_name, channel_msg;
1778         *pkt >> channel_name >> channel_msg;
1779
1780         session_t peer_id = pkt->getPeerId();
1781         verbosestream << "Mod channel message received from peer " << peer_id <<
1782                 " on channel " << channel_name << " message: " << channel_msg <<
1783                 std::endl;
1784
1785         // If mod channels are not enabled, discard message
1786         if (!g_settings->getBool("enable_mod_channels")) {
1787                 return;
1788         }
1789
1790         // If channel not registered, signal it and ignore message
1791         if (!m_modchannel_mgr->channelRegistered(channel_name)) {
1792                 NetworkPacket resp_pkt(TOCLIENT_MODCHANNEL_SIGNAL,
1793                         1 + 2 + channel_name.size(), peer_id);
1794                 resp_pkt << (u8)MODCHANNEL_SIGNAL_CHANNEL_NOT_REGISTERED << channel_name;
1795                 Send(&resp_pkt);
1796                 return;
1797         }
1798
1799         // @TODO: filter, rate limit
1800
1801         broadcastModChannelMessage(channel_name, channel_msg, peer_id);
1802 }
1803
1804 void Server::handleCommand_HaveMedia(NetworkPacket *pkt)
1805 {
1806         std::vector<u32> tokens;
1807         u8 numtokens;
1808
1809         *pkt >> numtokens;
1810         for (u16 i = 0; i < numtokens; i++) {
1811                 u32 n;
1812                 *pkt >> n;
1813                 tokens.emplace_back(n);
1814         }
1815
1816         const session_t peer_id = pkt->getPeerId();
1817         auto player = m_env->getPlayer(peer_id);
1818
1819         for (const u32 token : tokens) {
1820                 auto it = m_pending_dyn_media.find(token);
1821                 if (it == m_pending_dyn_media.end())
1822                         continue;
1823                 if (it->second.waiting_players.count(peer_id)) {
1824                         it->second.waiting_players.erase(peer_id);
1825                         if (player)
1826                                 getScriptIface()->on_dynamic_media_added(token, player->getName());
1827                 }
1828         }
1829 }