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 "content_sao.h"
  24 #include "emerge.h"
  25 #include "mapblock.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/networkprotocol.h"
  34 #include "network/serveropcodes.h"
  35 #include "util/auth.h"
  36 #include "util/base64.h"
  37 #include "util/pointedthing.h"
  38 #include "util/serialize.h"
  39 #include "util/srp.h"
  40
  41 void Server::handleCommand_Deprecated(NetworkPacket* pkt)
  42 {
  43         infostream << "Server: " << toServerCommandTable[pkt->getCommand()].name
  44                 << " not supported anymore" << std::endl;
  45 }
  46
  47 void Server::handleCommand_Init(NetworkPacket* pkt)
  48 {
  49
  50         if(pkt->getSize() < 1)
  51                 return;
  52
  53         RemoteClient* client = getClient(pkt->getPeerId(), CS_Created);
  54
  55         std::string addr_s;
  56         try {
  57                 Address address = getPeerAddress(pkt->getPeerId());
  58                 addr_s = address.serializeString();
  59         }
  60         catch (con::PeerNotFoundException &e) {
  61                 /*
  62                  * no peer for this packet found
  63                  * most common reason is peer timeout, e.g. peer didn't
  64                  * respond for some time, your server was overloaded or
  65                  * things like that.
  66                  */
  67                 infostream << "Server::ProcessData(): Canceling: peer "
  68                                 << pkt->getPeerId() << " not found" << std::endl;
  69                 return;
  70         }
  71
  72         // If net_proto_version is set, this client has already been handled
  73         if (client->getState() > CS_Created) {
  74                 verbosestream << "Server: Ignoring multiple TOSERVER_INITs from "
  75                                 << addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl;
  76                 return;
  77         }
  78
  79         verbosestream << "Server: Got TOSERVER_INIT from " << addr_s << " (peer_id="
  80                         << pkt->getPeerId() << ")" << std::endl;
  81
  82         // Do not allow multiple players in simple singleplayer mode.
  83         // This isn't a perfect way to do it, but will suffice for now
  84         if (m_simple_singleplayer_mode && m_clients.getClientIDs().size() > 1) {
  85                 infostream << "Server: Not allowing another client (" << addr_s
  86                                 << ") to connect in simple singleplayer mode" << std::endl;
  87                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SINGLEPLAYER);
  88                 return;
  89         }
  90
  91         // First byte after command is maximum supported
  92         // serialization version
  93         u8 client_max;
  94         u16 supp_compr_modes;
  95         u16 min_net_proto_version = 0;
  96         u16 max_net_proto_version;
  97         std::string playerName;
  98
  99         *pkt >> client_max >> supp_compr_modes >> min_net_proto_version
 100                         >> max_net_proto_version >> playerName;
 101
 102         u8 our_max = SER_FMT_VER_HIGHEST_READ;
 103         // Use the highest version supported by both
 104         u8 depl_serial_v = std::min(client_max, our_max);
 105         // If it's lower than the lowest supported, give up.
 106         if (depl_serial_v < SER_FMT_VER_LOWEST_READ)
 107                 depl_serial_v = SER_FMT_VER_INVALID;
 108
 109         if (depl_serial_v == SER_FMT_VER_INVALID) {
 110                 actionstream << "Server: A mismatched client tried to connect from "
 111                                 << addr_s << std::endl;
 112                 infostream<<"Server: Cannot negotiate serialization version with "
 113                                 << addr_s << std::endl;
 114                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION);
 115                 return;
 116         }
 117
 118         client->setPendingSerializationVersion(depl_serial_v);
 119
 120         /*
 121                 Read and check network protocol version
 122         */
 123
 124         u16 net_proto_version = 0;
 125
 126         // Figure out a working version if it is possible at all
 127         if (max_net_proto_version >= SERVER_PROTOCOL_VERSION_MIN ||
 128                         min_net_proto_version <= SERVER_PROTOCOL_VERSION_MAX) {
 129                 // If maximum is larger than our maximum, go with our maximum
 130                 if (max_net_proto_version > SERVER_PROTOCOL_VERSION_MAX)
 131                         net_proto_version = SERVER_PROTOCOL_VERSION_MAX;
 132                 // Else go with client's maximum
 133                 else
 134                         net_proto_version = max_net_proto_version;
 135         }
 136
 137         verbosestream << "Server: " << addr_s << ": Protocol version: min: "
 138                         << min_net_proto_version << ", max: " << max_net_proto_version
 139                         << ", chosen: " << net_proto_version << std::endl;
 140
 141         client->net_proto_version = net_proto_version;
 142
 143         // On this handler at least protocol version 25 is required
 144         if (net_proto_version < 25 ||
 145                         net_proto_version < SERVER_PROTOCOL_VERSION_MIN ||
 146                         net_proto_version > SERVER_PROTOCOL_VERSION_MAX) {
 147                 actionstream << "Server: A mismatched client tried to connect from "
 148                                 << addr_s << std::endl;
 149                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION);
 150                 return;
 151         }
 152
 153         if (g_settings->getBool("strict_protocol_version_checking")) {
 154                 if (net_proto_version != LATEST_PROTOCOL_VERSION) {
 155                         actionstream << "Server: A mismatched (strict) client tried to "
 156                                         << "connect from " << addr_s << std::endl;
 157                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION);
 158                         return;
 159                 }
 160         }
 161
 162         /*
 163                 Validate player name
 164         */
 165         const char* playername = playerName.c_str();
 166
 167         size_t pns = playerName.size();
 168         if (pns == 0 || pns > PLAYERNAME_SIZE) {
 169                 actionstream << "Server: Player with "
 170                         << ((pns > PLAYERNAME_SIZE) ? "a too long" : "an empty")
 171                         << " name tried to connect from " << addr_s << std::endl;
 172                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_NAME);
 173                 return;
 174         }
 175
 176         if (string_allowed(playerName, PLAYERNAME_ALLOWED_CHARS) == false) {
 177                 actionstream << "Server: Player with an invalid name "
 178                                 << "tried to connect from " << addr_s << std::endl;
 179                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_CHARS_IN_NAME);
 180                 return;
 181         }
 182
 183         m_clients.setPlayerName(pkt->getPeerId(), playername);
 184         //TODO (later) case insensitivity
 185
 186         std::string legacyPlayerNameCasing = playerName;
 187
 188         if (!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0) {
 189                 actionstream << "Server: Player with the name \"singleplayer\" "
 190                                 << "tried to connect from " << addr_s << std::endl;
 191                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_NAME);
 192                 return;
 193         }
 194
 195         {
 196                 std::string reason;
 197                 if (m_script->on_prejoinplayer(playername, addr_s, &reason)) {
 198                         actionstream << "Server: Player with the name \"" << playerName << "\" "
 199                                         << "tried to connect from " << addr_s << " "
 200                                         << "but it was disallowed for the following reason: "
 201                                         << reason << std::endl;
 202                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_CUSTOM_STRING,
 203                                         reason.c_str());
 204                         return;
 205                 }
 206         }
 207
 208         infostream << "Server: New connection: \"" << playerName << "\" from "
 209                         << addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl;
 210
 211         // Enforce user limit.
 212         // Don't enforce for users that have some admin right
 213         if (m_clients.isUserLimitReached() &&
 214                         !checkPriv(playername, "server") &&
 215                         !checkPriv(playername, "ban") &&
 216                         !checkPriv(playername, "privs") &&
 217                         !checkPriv(playername, "password") &&
 218                         playername != g_settings->get("name")) {
 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(pkt->getPeerId(), 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
 243                                         << " tried to log in, but password field"
 244                                         << " was invalid (unknown mechcode)." << std::endl;
 245                                 DenyAccess(pkt->getPeerId(), 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
 253                                 << " tried to log in, but password field"
 254                                 << " was invalid (invalid base64)." << std::endl;
 255                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
 256                         return;
 257                 }
 258         } else {
 259                 std::string default_password = g_settings->get("default_password");
 260                 if (default_password.length() == 0) {
 261                         auth_mechs |= AUTH_MECHANISM_FIRST_SRP;
 262                 } else {
 263                         // Take care of default passwords.
 264                         client->enc_pwd = get_encoded_srp_verifier(playerName, default_password);
 265                         auth_mechs |= AUTH_MECHANISM_SRP;
 266                         // Allocate player in db, but only on successful login.
 267                         client->create_player_on_auth_success = true;
 268                 }
 269         }
 270
 271         /*
 272                 Answer with a TOCLIENT_HELLO
 273         */
 274
 275         verbosestream << "Sending TOCLIENT_HELLO with auth method field: "
 276                 << auth_mechs << std::endl;
 277
 278         NetworkPacket resp_pkt(TOCLIENT_HELLO, 1 + 4
 279                 + legacyPlayerNameCasing.size(), pkt->getPeerId());
 280
 281         u16 depl_compress_mode = NETPROTO_COMPRESSION_NONE;
 282         resp_pkt << depl_serial_v << depl_compress_mode << net_proto_version
 283                 << auth_mechs << legacyPlayerNameCasing;
 284
 285         Send(&resp_pkt);
 286
 287         client->allowed_auth_mechs = auth_mechs;
 288         client->setDeployedCompressionMode(depl_compress_mode);
 289
 290         m_clients.event(pkt->getPeerId(), CSE_Hello);
 291 }
 292
 293 void Server::handleCommand_Init_Legacy(NetworkPacket* pkt)
 294 {
 295         // [0] u8 SER_FMT_VER_HIGHEST_READ
 296         // [1] u8[20] player_name
 297         // [21] u8[28] password <--- can be sent without this, from old versions
 298
 299         if (pkt->getSize() < 1+PLAYERNAME_SIZE)
 300                 return;
 301
 302         RemoteClient* client = getClient(pkt->getPeerId(), CS_Created);
 303
 304         std::string addr_s;
 305         try {
 306                 Address address = getPeerAddress(pkt->getPeerId());
 307                 addr_s = address.serializeString();
 308         }
 309         catch (con::PeerNotFoundException &e) {
 310                 /*
 311                  * no peer for this packet found
 312                  * most common reason is peer timeout, e.g. peer didn't
 313                  * respond for some time, your server was overloaded or
 314                  * things like that.
 315                  */
 316                 infostream << "Server::ProcessData(): Canceling: peer "
 317                                 << pkt->getPeerId() << " not found" << std::endl;
 318                 return;
 319         }
 320
 321         // If net_proto_version is set, this client has already been handled
 322         if (client->getState() > CS_Created) {
 323                 verbosestream << "Server: Ignoring multiple TOSERVER_INITs from "
 324                                 << addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl;
 325                 return;
 326         }
 327
 328         verbosestream << "Server: Got TOSERVER_INIT_LEGACY from " << addr_s << " (peer_id="
 329                         << pkt->getPeerId() << ")" << std::endl;
 330
 331         // Do not allow multiple players in simple singleplayer mode.
 332         // This isn't a perfect way to do it, but will suffice for now
 333         if (m_simple_singleplayer_mode && m_clients.getClientIDs().size() > 1) {
 334                 infostream << "Server: Not allowing another client (" << addr_s
 335                                 << ") to connect in simple singleplayer mode" << std::endl;
 336                 DenyAccess_Legacy(pkt->getPeerId(), L"Running in simple singleplayer mode.");
 337                 return;
 338         }
 339
 340         // First byte after command is maximum supported
 341         // serialization version
 342         u8 client_max;
 343
 344         *pkt >> client_max;
 345
 346         u8 our_max = SER_FMT_VER_HIGHEST_READ;
 347         // Use the highest version supported by both
 348         int deployed = std::min(client_max, our_max);
 349         // If it's lower than the lowest supported, give up.
 350         if (deployed < SER_FMT_VER_LOWEST_READ)
 351                 deployed = SER_FMT_VER_INVALID;
 352
 353         if (deployed == SER_FMT_VER_INVALID) {
 354                 actionstream << "Server: A mismatched client tried to connect from "
 355                                 << addr_s << std::endl;
 356                 infostream<<"Server: Cannot negotiate serialization version with "
 357                                 << addr_s << std::endl;
 358                 DenyAccess_Legacy(pkt->getPeerId(), std::wstring(
 359                                 L"Your client's version is not supported.\n"
 360                                 L"Server version is ")
 361                                 + utf8_to_wide(g_version_string) + L"."
 362                 );
 363                 return;
 364         }
 365
 366         client->setPendingSerializationVersion(deployed);
 367
 368         /*
 369                 Read and check network protocol version
 370         */
 371
 372         u16 min_net_proto_version = 0;
 373         if (pkt->getSize() >= 1 + PLAYERNAME_SIZE + PASSWORD_SIZE + 2)
 374                 min_net_proto_version = pkt->getU16(1 + PLAYERNAME_SIZE + PASSWORD_SIZE);
 375
 376         // Use same version as minimum and maximum if maximum version field
 377         // doesn't exist (backwards compatibility)
 378         u16 max_net_proto_version = min_net_proto_version;
 379         if (pkt->getSize() >= 1 + PLAYERNAME_SIZE + PASSWORD_SIZE + 2 + 2)
 380                 max_net_proto_version = pkt->getU16(1 + PLAYERNAME_SIZE + PASSWORD_SIZE + 2);
 381
 382         // Start with client's maximum version
 383         u16 net_proto_version = max_net_proto_version;
 384
 385         // Figure out a working version if it is possible at all
 386         if (max_net_proto_version >= SERVER_PROTOCOL_VERSION_MIN ||
 387                         min_net_proto_version <= SERVER_PROTOCOL_VERSION_MAX) {
 388                 // If maximum is larger than our maximum, go with our maximum
 389                 if (max_net_proto_version > SERVER_PROTOCOL_VERSION_MAX)
 390                         net_proto_version = SERVER_PROTOCOL_VERSION_MAX;
 391                 // Else go with client's maximum
 392                 else
 393                         net_proto_version = max_net_proto_version;
 394         }
 395
 396         // The client will send up to date init packet, ignore this one
 397         if (net_proto_version >= 25)
 398                 return;
 399
 400         verbosestream << "Server: " << addr_s << ": Protocol version: min: "
 401                         << min_net_proto_version << ", max: " << max_net_proto_version
 402                         << ", chosen: " << net_proto_version << std::endl;
 403
 404         client->net_proto_version = net_proto_version;
 405
 406         if (net_proto_version < SERVER_PROTOCOL_VERSION_MIN ||
 407                         net_proto_version > SERVER_PROTOCOL_VERSION_MAX) {
 408                 actionstream << "Server: A mismatched client tried to connect from "
 409                                 << addr_s << std::endl;
 410                 DenyAccess_Legacy(pkt->getPeerId(), std::wstring(
 411                                 L"Your client's version is not supported.\n"
 412                                 L"Server version is ")
 413                                 + utf8_to_wide(g_version_string) + L",\n"
 414                                 + L"server's PROTOCOL_VERSION is "
 415                                 + utf8_to_wide(itos(SERVER_PROTOCOL_VERSION_MIN))
 416                                 + L"..."
 417                                 + utf8_to_wide(itos(SERVER_PROTOCOL_VERSION_MAX))
 418                                 + L", client's PROTOCOL_VERSION is "
 419                                 + utf8_to_wide(itos(min_net_proto_version))
 420                                 + L"..."
 421                                 + utf8_to_wide(itos(max_net_proto_version))
 422                 );
 423                 return;
 424         }
 425
 426         if (g_settings->getBool("strict_protocol_version_checking")) {
 427                 if (net_proto_version != LATEST_PROTOCOL_VERSION) {
 428                         actionstream << "Server: A mismatched (strict) client tried to "
 429                                         << "connect from " << addr_s << std::endl;
 430                         DenyAccess_Legacy(pkt->getPeerId(), std::wstring(
 431                                         L"Your client's version is not supported.\n"
 432                                         L"Server version is ")
 433                                         + utf8_to_wide(g_version_string) + L",\n"
 434                                         + L"server's PROTOCOL_VERSION (strict) is "
 435                                         + utf8_to_wide(itos(LATEST_PROTOCOL_VERSION))
 436                                         + L", client's PROTOCOL_VERSION is "
 437                                         + utf8_to_wide(itos(min_net_proto_version))
 438                                         + L"..."
 439                                         + utf8_to_wide(itos(max_net_proto_version))
 440                         );
 441                         return;
 442                 }
 443         }
 444
 445         /*
 446                 Set up player
 447         */
 448         char playername[PLAYERNAME_SIZE];
 449         unsigned int playername_length = 0;
 450         for (; playername_length < PLAYERNAME_SIZE; playername_length++ ) {
 451                 playername[playername_length] = pkt->getChar(1+playername_length);
 452                 if (pkt->getChar(1+playername_length) == 0)
 453                         break;
 454         }
 455
 456         if (playername_length == PLAYERNAME_SIZE) {
 457                 actionstream << "Server: Player with name exceeding max length "
 458                                 << "tried to connect from " << addr_s << std::endl;
 459                 DenyAccess_Legacy(pkt->getPeerId(), L"Name too long");
 460                 return;
 461         }
 462
 463
 464         if (playername[0]=='\0') {
 465                 actionstream << "Server: Player with an empty name "
 466                                 << "tried to connect from " << addr_s << std::endl;
 467                 DenyAccess_Legacy(pkt->getPeerId(), L"Empty name");
 468                 return;
 469         }
 470
 471         if (string_allowed(playername, PLAYERNAME_ALLOWED_CHARS) == false) {
 472                 actionstream << "Server: Player with an invalid name "
 473                                 << "tried to connect from " << addr_s << std::endl;
 474                 DenyAccess_Legacy(pkt->getPeerId(), L"Name contains unallowed characters");
 475                 return;
 476         }
 477
 478         if (!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0) {
 479                 actionstream << "Server: Player with the name \"singleplayer\" "
 480                                 << "tried to connect from " << addr_s << std::endl;
 481                 DenyAccess_Legacy(pkt->getPeerId(), L"Name is not allowed");
 482                 return;
 483         }
 484
 485         {
 486                 std::string reason;
 487                 if (m_script->on_prejoinplayer(playername, addr_s, &reason)) {
 488                         actionstream << "Server: Player with the name \"" << playername << "\" "
 489                                         << "tried to connect from " << addr_s << " "
 490                                         << "but it was disallowed for the following reason: "
 491                                         << reason << std::endl;
 492                         DenyAccess_Legacy(pkt->getPeerId(), utf8_to_wide(reason.c_str()));
 493                         return;
 494                 }
 495         }
 496
 497         infostream<<"Server: New connection: \""<<playername<<"\" from "
 498                         <<addr_s<<" (peer_id="<<pkt->getPeerId()<<")"<<std::endl;
 499
 500         // Get password
 501         char given_password[PASSWORD_SIZE];
 502         if (pkt->getSize() < 1 + PLAYERNAME_SIZE + PASSWORD_SIZE) {
 503                 // old version - assume blank password
 504                 given_password[0] = 0;
 505         }
 506         else {
 507                 for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
 508                         given_password[i] = pkt->getChar(21 + i);
 509                 }
 510                 given_password[PASSWORD_SIZE - 1] = 0;
 511         }
 512
 513         if (!base64_is_valid(given_password)) {
 514                 actionstream << "Server: " << playername
 515                                 << " supplied invalid password hash" << std::endl;
 516                 DenyAccess_Legacy(pkt->getPeerId(), L"Invalid password hash");
 517                 return;
 518         }
 519
 520         // Enforce user limit.
 521         // Don't enforce for users that have some admin right
 522         if (m_clients.isUserLimitReached() &&
 523                         !checkPriv(playername, "server") &&
 524                         !checkPriv(playername, "ban") &&
 525                         !checkPriv(playername, "privs") &&
 526                         !checkPriv(playername, "password") &&
 527                         playername != g_settings->get("name")) {
 528                 actionstream << "Server: " << playername << " tried to join, but there"
 529                                 << " are already max_users="
 530                                 << g_settings->getU16("max_users") << " players." << std::endl;
 531                 DenyAccess_Legacy(pkt->getPeerId(), L"Too many users.");
 532                 return;
 533         }
 534
 535         std::string checkpwd; // Password hash to check against
 536         bool has_auth = m_script->getAuth(playername, &checkpwd, NULL);
 537
 538         // If no authentication info exists for user, create it
 539         if (!has_auth) {
 540                 if (!isSingleplayer() &&
 541                                 g_settings->getBool("disallow_empty_password") &&
 542                                 std::string(given_password) == "") {
 543                         actionstream << "Server: " << playername
 544                                         << " supplied empty password" << std::endl;
 545                         DenyAccess_Legacy(pkt->getPeerId(), L"Empty passwords are "
 546                                         L"disallowed. Set a password and try again.");
 547                         return;
 548                 }
 549                 std::string raw_default_password =
 550                         g_settings->get("default_password");
 551                 std::string initial_password =
 552                         translate_password(playername, raw_default_password);
 553
 554                 // If default_password is empty, allow any initial password
 555                 if (raw_default_password.length() == 0)
 556                         initial_password = given_password;
 557
 558                 m_script->createAuth(playername, initial_password);
 559         }
 560
 561         has_auth = m_script->getAuth(playername, &checkpwd, NULL);
 562
 563         if (!has_auth) {
 564                 actionstream << "Server: " << playername << " cannot be authenticated"
 565                                 << " (auth handler does not work?)" << std::endl;
 566                 DenyAccess_Legacy(pkt->getPeerId(), L"Not allowed to login");
 567                 return;
 568         }
 569
 570         if (given_password != checkpwd) {
 571                 actionstream << "Server: User " << playername
 572                         << " at " << addr_s
 573                         << " supplied wrong password (auth mechanism: legacy)."
 574                         << std::endl;
 575                 DenyAccess_Legacy(pkt->getPeerId(), L"Wrong password");
 576                 return;
 577         }
 578
 579         RemotePlayer *player =
 580                         static_cast<RemotePlayer*>(m_env->getPlayer(playername));
 581
 582         if (player && player->peer_id != 0) {
 583                 actionstream << "Server: " << playername << ": Failed to emerge player"
 584                                 << " (player allocated to an another client)" << std::endl;
 585                 DenyAccess_Legacy(pkt->getPeerId(), L"Another client is connected with this "
 586                                 L"name. If your client closed unexpectedly, try again in "
 587                                 L"a minute.");
 588         }
 589
 590         m_clients.setPlayerName(pkt->getPeerId(), playername);
 591
 592         /*
 593                 Answer with a TOCLIENT_INIT
 594         */
 595
 596         NetworkPacket resp_pkt(TOCLIENT_INIT_LEGACY, 1 + 6 + 8 + 4,
 597                         pkt->getPeerId());
 598
 599         resp_pkt << (u8) deployed << (v3s16) floatToInt(v3f(0,0,0), BS)
 600                         << (u64) m_env->getServerMap().getSeed()
 601                         << g_settings->getFloat("dedicated_server_step");
 602
 603         Send(&resp_pkt);
 604         m_clients.event(pkt->getPeerId(), CSE_InitLegacy);
 605 }
 606
 607 void Server::handleCommand_Init2(NetworkPacket* pkt)
 608 {
 609         verbosestream << "Server: Got TOSERVER_INIT2 from "
 610                         << pkt->getPeerId() << std::endl;
 611
 612         m_clients.event(pkt->getPeerId(), CSE_GotInit2);
 613         u16 protocol_version = m_clients.getProtocolVersion(pkt->getPeerId());
 614
 615
 616         /*
 617                 Send some initialization data
 618         */
 619
 620         infostream << "Server: Sending content to "
 621                         << getPlayerName(pkt->getPeerId()) << std::endl;
 622
 623         // Send player movement settings
 624         SendMovement(pkt->getPeerId());
 625
 626         // Send item definitions
 627         SendItemDef(pkt->getPeerId(), m_itemdef, protocol_version);
 628
 629         // Send node definitions
 630         SendNodeDef(pkt->getPeerId(), m_nodedef, protocol_version);
 631
 632         m_clients.event(pkt->getPeerId(), CSE_SetDefinitionsSent);
 633
 634         // Send media announcement
 635         sendMediaAnnouncement(pkt->getPeerId());
 636
 637         // Send detached inventories
 638         sendDetachedInventories(pkt->getPeerId());
 639
 640         // Send time of day
 641         u16 time = m_env->getTimeOfDay();
 642         float time_speed = g_settings->getFloat("time_speed");
 643         SendTimeOfDay(pkt->getPeerId(), time, time_speed);
 644
 645         SendCSMFlavourLimits(pkt->getPeerId());
 646
 647         // Warnings about protocol version can be issued here
 648         if (getClient(pkt->getPeerId())->net_proto_version < LATEST_PROTOCOL_VERSION) {
 649                 SendChatMessage(pkt->getPeerId(), ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
 650                                 L"# Server: WARNING: YOUR CLIENT'S VERSION MAY NOT BE FULLY COMPATIBLE "
 651                                 L"WITH THIS SERVER!"));
 652
 653         }
 654 }
 655
 656 void Server::handleCommand_RequestMedia(NetworkPacket* pkt)
 657 {
 658         std::vector<std::string> tosend;
 659         u16 numfiles;
 660
 661         *pkt >> numfiles;
 662
 663         infostream << "Sending " << numfiles << " files to "
 664                         << getPlayerName(pkt->getPeerId()) << std::endl;
 665         verbosestream << "TOSERVER_REQUEST_MEDIA: " << std::endl;
 666
 667         for (u16 i = 0; i < numfiles; i++) {
 668                 std::string name;
 669
 670                 *pkt >> name;
 671
 672                 tosend.push_back(name);
 673                 verbosestream << "TOSERVER_REQUEST_MEDIA: requested file "
 674                                 << name << std::endl;
 675         }
 676
 677         sendRequestedMedia(pkt->getPeerId(), tosend);
 678 }
 679
 680 void Server::handleCommand_ClientReady(NetworkPacket* pkt)
 681 {
 682         u16 peer_id = pkt->getPeerId();
 683
 684         PlayerSAO* playersao = StageTwoClientInit(peer_id);
 685
 686         if (playersao == NULL) {
 687                 actionstream
 688                         << "TOSERVER_CLIENT_READY stage 2 client init failed for peer_id: "
 689                         << peer_id << std::endl;
 690                 m_con.DisconnectPeer(peer_id);
 691                 return;
 692         }
 693
 694
 695         if (pkt->getSize() < 8) {
 696                 errorstream
 697                         << "TOSERVER_CLIENT_READY client sent inconsistent data, disconnecting peer_id: "
 698                         << peer_id << std::endl;
 699                 m_con.DisconnectPeer(peer_id);
 700                 return;
 701         }
 702
 703         u8 major_ver, minor_ver, patch_ver, reserved;
 704         std::string full_ver;
 705         *pkt >> major_ver >> minor_ver >> patch_ver >> reserved >> full_ver;
 706
 707         m_clients.setClientVersion(
 708                         peer_id, major_ver, minor_ver, patch_ver,
 709                         full_ver);
 710
 711         const std::vector<std::string> &players = m_clients.getPlayerNames();
 712         NetworkPacket list_pkt(TOCLIENT_UPDATE_PLAYER_LIST, 0, peer_id);
 713         list_pkt << (u8) PLAYER_LIST_INIT << (u16) players.size();
 714         for (const std::string &player: players) {
 715                 list_pkt <<  player;
 716         }
 717         m_clients.send(peer_id, 0, &list_pkt, true);
 718
 719         NetworkPacket notice_pkt(TOCLIENT_UPDATE_PLAYER_LIST, 0, PEER_ID_INEXISTENT);
 720         // (u16) 1 + std::string represents a pseudo vector serialization representation
 721         notice_pkt << (u8) PLAYER_LIST_ADD << (u16) 1 << std::string(playersao->getPlayer()->getName());
 722         m_clients.sendToAll(&notice_pkt);
 723
 724         m_clients.event(peer_id, CSE_SetClientReady);
 725         m_script->on_joinplayer(playersao);
 726         // Send shutdown timer if shutdown has been scheduled
 727         if (m_shutdown_timer > 0.0f) {
 728                 std::wstringstream ws;
 729                 ws << L"*** Server shutting down in "
 730                                 << duration_to_string(myround(m_shutdown_timer)).c_str() << ".";
 731                 SendChatMessage(pkt->getPeerId(), ws.str());
 732         }
 733 }
 734
 735 void Server::handleCommand_GotBlocks(NetworkPacket* pkt)
 736 {
 737         if (pkt->getSize() < 1)
 738                 return;
 739
 740         /*
 741                 [0] u16 command
 742                 [2] u8 count
 743                 [3] v3s16 pos_0
 744                 [3+6] v3s16 pos_1
 745                 ...
 746         */
 747
 748         u8 count;
 749         *pkt >> count;
 750
 751         RemoteClient *client = getClient(pkt->getPeerId());
 752
 753         if ((s16)pkt->getSize() < 1 + (int)count * 6) {
 754                 throw con::InvalidIncomingDataException
 755                                 ("GOTBLOCKS length is too short");
 756         }
 757
 758         for (u16 i = 0; i < count; i++) {
 759                 v3s16 p;
 760                 *pkt >> p;
 761                 client->GotBlock(p);
 762         }
 763 }
 764
 765 void Server::process_PlayerPos(RemotePlayer *player, PlayerSAO *playersao,
 766         NetworkPacket *pkt)
 767 {
 768         if (pkt->getRemainingBytes() < 12 + 12 + 4 + 4)
 769                 return;
 770
 771         v3s32 ps, ss;
 772         s32 f32pitch, f32yaw;
 773         u8 f32fov;
 774
 775         *pkt >> ps;
 776         *pkt >> ss;
 777         *pkt >> f32pitch;
 778         *pkt >> f32yaw;
 779
 780         f32 pitch = (f32)f32pitch / 100.0;
 781         f32 yaw = (f32)f32yaw / 100.0;
 782         u32 keyPressed = 0;
 783
 784         // default behavior (in case an old client doesn't send these)
 785         f32 fov = 0;
 786         u8 wanted_range = 0;
 787
 788         if (pkt->getRemainingBytes() >= 4)
 789                 *pkt >> keyPressed;
 790         if (pkt->getRemainingBytes() >= 1) {
 791                 *pkt >> f32fov;
 792                 fov = (f32)f32fov / 80.0;
 793         }
 794         if (pkt->getRemainingBytes() >= 1)
 795                 *pkt >> wanted_range;
 796
 797         v3f position((f32)ps.X / 100.0, (f32)ps.Y / 100.0, (f32)ps.Z / 100.0);
 798         v3f speed((f32)ss.X / 100.0, (f32)ss.Y / 100.0, (f32)ss.Z / 100.0);
 799
 800         pitch = modulo360f(pitch);
 801         yaw = wrapDegrees_0_360(yaw);
 802
 803         playersao->setBasePosition(position);
 804         player->setSpeed(speed);
 805         playersao->setPitch(pitch);
 806         playersao->setYaw(yaw);
 807         playersao->setFov(fov);
 808         playersao->setWantedRange(wanted_range);
 809         player->keyPressed = keyPressed;
 810         player->control.up = (keyPressed & 1);
 811         player->control.down = (keyPressed & 2);
 812         player->control.left = (keyPressed & 4);
 813         player->control.right = (keyPressed & 8);
 814         player->control.jump = (keyPressed & 16);
 815         player->control.aux1 = (keyPressed & 32);
 816         player->control.sneak = (keyPressed & 64);
 817         player->control.LMB = (keyPressed & 128);
 818         player->control.RMB = (keyPressed & 256);
 819
 820         if (playersao->checkMovementCheat()) {
 821                 // Call callbacks
 822                 m_script->on_cheat(playersao, "moved_too_fast");
 823                 SendMovePlayer(pkt->getPeerId());
 824         }
 825 }
 826
 827 void Server::handleCommand_PlayerPos(NetworkPacket* pkt)
 828 {
 829         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
 830         if (player == NULL) {
 831                 errorstream << "Server::ProcessData(): Canceling: "
 832                                 "No player for peer_id=" << pkt->getPeerId()
 833                                 << " disconnecting peer!" << std::endl;
 834                 m_con.DisconnectPeer(pkt->getPeerId());
 835                 return;
 836         }
 837
 838         PlayerSAO *playersao = player->getPlayerSAO();
 839         if (playersao == NULL) {
 840                 errorstream << "Server::ProcessData(): Canceling: "
 841                                 "No player object for peer_id=" << pkt->getPeerId()
 842                                 << " disconnecting peer!" << std::endl;
 843                 m_con.DisconnectPeer(pkt->getPeerId());
 844                 return;
 845         }
 846
 847         // If player is dead we don't care of this packet
 848         if (playersao->isDead()) {
 849                 verbosestream << "TOSERVER_PLAYERPOS: " << player->getName()
 850                                 << " is dead. Ignoring packet";
 851                 return;
 852         }
 853
 854         process_PlayerPos(player, playersao, pkt);
 855 }
 856
 857 void Server::handleCommand_DeletedBlocks(NetworkPacket* pkt)
 858 {
 859         if (pkt->getSize() < 1)
 860                 return;
 861
 862         /*
 863                 [0] u16 command
 864                 [2] u8 count
 865                 [3] v3s16 pos_0
 866                 [3+6] v3s16 pos_1
 867                 ...
 868         */
 869
 870         u8 count;
 871         *pkt >> count;
 872
 873         RemoteClient *client = getClient(pkt->getPeerId());
 874
 875         if ((s16)pkt->getSize() < 1 + (int)count * 6) {
 876                 throw con::InvalidIncomingDataException
 877                                 ("DELETEDBLOCKS length is too short");
 878         }
 879
 880         for (u16 i = 0; i < count; i++) {
 881                 v3s16 p;
 882                 *pkt >> p;
 883                 client->SetBlockNotSent(p);
 884         }
 885 }
 886
 887 void Server::handleCommand_InventoryAction(NetworkPacket* pkt)
 888 {
 889         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
 890
 891         if (player == NULL) {
 892                 errorstream << "Server::ProcessData(): Canceling: "
 893                                 "No player for peer_id=" << pkt->getPeerId()
 894                                 << " disconnecting peer!" << std::endl;
 895                 m_con.DisconnectPeer(pkt->getPeerId());
 896                 return;
 897         }
 898
 899         PlayerSAO *playersao = player->getPlayerSAO();
 900         if (playersao == NULL) {
 901                 errorstream << "Server::ProcessData(): Canceling: "
 902                                 "No player object for peer_id=" << pkt->getPeerId()
 903                                 << " disconnecting peer!" << std::endl;
 904                 m_con.DisconnectPeer(pkt->getPeerId());
 905                 return;
 906         }
 907
 908         // Strip command and create a stream
 909         std::string datastring(pkt->getString(0), pkt->getSize());
 910         verbosestream << "TOSERVER_INVENTORY_ACTION: data=" << datastring
 911                 << std::endl;
 912         std::istringstream is(datastring, std::ios_base::binary);
 913         // Create an action
 914         InventoryAction *a = InventoryAction::deSerialize(is);
 915         if (!a) {
 916                 infostream << "TOSERVER_INVENTORY_ACTION: "
 917                                 << "InventoryAction::deSerialize() returned NULL"
 918                                 << std::endl;
 919                 return;
 920         }
 921
 922         // If something goes wrong, this player is to blame
 923         RollbackScopeActor rollback_scope(m_rollback,
 924                         std::string("player:")+player->getName());
 925
 926         /*
 927                 Note: Always set inventory not sent, to repair cases
 928                 where the client made a bad prediction.
 929         */
 930
 931         /*
 932                 Handle restrictions and special cases of the move action
 933         */
 934         if (a->getType() == IAction::Move) {
 935                 IMoveAction *ma = (IMoveAction*)a;
 936
 937                 ma->from_inv.applyCurrentPlayer(player->getName());
 938                 ma->to_inv.applyCurrentPlayer(player->getName());
 939
 940                 setInventoryModified(ma->from_inv, false);
 941                 setInventoryModified(ma->to_inv, false);
 942
 943                 bool from_inv_is_current_player =
 944                         (ma->from_inv.type == InventoryLocation::PLAYER) &&
 945                         (ma->from_inv.name == player->getName());
 946
 947                 bool to_inv_is_current_player =
 948                         (ma->to_inv.type == InventoryLocation::PLAYER) &&
 949                         (ma->to_inv.name == player->getName());
 950
 951                 /*
 952                         Disable moving items out of craftpreview
 953                 */
 954                 if (ma->from_list == "craftpreview") {
 955                         infostream << "Ignoring IMoveAction from "
 956                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 957                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 958                                         << " because src is " << ma->from_list << std::endl;
 959                         delete a;
 960                         return;
 961                 }
 962
 963                 /*
 964                         Disable moving items into craftresult and craftpreview
 965                 */
 966                 if (ma->to_list == "craftpreview" || ma->to_list == "craftresult") {
 967                         infostream << "Ignoring IMoveAction from "
 968                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 969                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 970                                         << " because dst is " << ma->to_list << std::endl;
 971                         delete a;
 972                         return;
 973                 }
 974
 975                 // Disallow moving items in elsewhere than player's inventory
 976                 // if not allowed to interact
 977                 if (!checkPriv(player->getName(), "interact") &&
 978                                 (!from_inv_is_current_player ||
 979                                 !to_inv_is_current_player)) {
 980                         infostream << "Cannot move outside of player's inventory: "
 981                                         << "No interact privilege" << std::endl;
 982                         delete a;
 983                         return;
 984                 }
 985         }
 986         /*
 987                 Handle restrictions and special cases of the drop action
 988         */
 989         else if (a->getType() == IAction::Drop) {
 990                 IDropAction *da = (IDropAction*)a;
 991
 992                 da->from_inv.applyCurrentPlayer(player->getName());
 993
 994                 setInventoryModified(da->from_inv, false);
 995
 996                 /*
 997                         Disable dropping items out of craftpreview
 998                 */
 999                 if (da->from_list == "craftpreview") {
1000                         infostream << "Ignoring IDropAction from "
1001                                         << (da->from_inv.dump()) << ":" << da->from_list
1002                                         << " because src is " << da->from_list << std::endl;
1003                         delete a;
1004                         return;
1005                 }
1006
1007                 // Disallow dropping items if not allowed to interact
1008                 if (!checkPriv(player->getName(), "interact")) {
1009                         delete a;
1010                         return;
1011                 }
1012
1013                 // Disallow dropping items if dead
1014                 if (playersao->isDead()) {
1015                         infostream << "Ignoring IDropAction from "
1016                                         << (da->from_inv.dump()) << ":" << da->from_list
1017                                         << " because player is dead." << std::endl;
1018                         delete a;
1019                         return;
1020                 }
1021         }
1022         /*
1023                 Handle restrictions and special cases of the craft action
1024         */
1025         else if (a->getType() == IAction::Craft) {
1026                 ICraftAction *ca = (ICraftAction*)a;
1027
1028                 ca->craft_inv.applyCurrentPlayer(player->getName());
1029
1030                 setInventoryModified(ca->craft_inv, false);
1031
1032                 //bool craft_inv_is_current_player =
1033                 //      (ca->craft_inv.type == InventoryLocation::PLAYER) &&
1034                 //      (ca->craft_inv.name == player->getName());
1035
1036                 // Disallow crafting if not allowed to interact
1037                 if (!checkPriv(player->getName(), "interact")) {
1038                         infostream << "Cannot craft: "
1039                                         << "No interact privilege" << std::endl;
1040                         delete a;
1041                         return;
1042                 }
1043         }
1044
1045         // Do the action
1046         a->apply(this, playersao, this);
1047         // Eat the action
1048         delete a;
1049
1050         SendInventory(playersao);
1051 }
1052
1053 void Server::handleCommand_ChatMessage(NetworkPacket* pkt)
1054 {
1055         /*
1056                 u16 command
1057                 u16 length
1058                 wstring message
1059         */
1060         u16 len;
1061         *pkt >> len;
1062
1063         std::wstring message;
1064         for (u16 i = 0; i < len; i++) {
1065                 u16 tmp_wchar;
1066                 *pkt >> tmp_wchar;
1067
1068                 message += (wchar_t)tmp_wchar;
1069         }
1070
1071         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1072         if (player == NULL) {
1073                 errorstream << "Server::ProcessData(): Canceling: "
1074                                 "No player for peer_id=" << pkt->getPeerId()
1075                                 << " disconnecting peer!" << std::endl;
1076                 m_con.DisconnectPeer(pkt->getPeerId());
1077                 return;
1078         }
1079
1080         // Get player name of this client
1081         std::string name = player->getName();
1082         std::wstring wname = narrow_to_wide(name);
1083
1084         std::wstring answer_to_sender = handleChat(name, wname, message, true, player);
1085         if (!answer_to_sender.empty()) {
1086                 // Send the answer to sender
1087                 SendChatMessage(pkt->getPeerId(), ChatMessage(CHATMESSAGE_TYPE_NORMAL,
1088                                 answer_to_sender, wname));
1089         }
1090 }
1091
1092 void Server::handleCommand_Damage(NetworkPacket* pkt)
1093 {
1094         u8 damage;
1095
1096         *pkt >> damage;
1097
1098         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1099
1100         if (player == NULL) {
1101                 errorstream << "Server::ProcessData(): Canceling: "
1102                                 "No player for peer_id=" << pkt->getPeerId()
1103                                 << " disconnecting peer!" << std::endl;
1104                 m_con.DisconnectPeer(pkt->getPeerId());
1105                 return;
1106         }
1107
1108         PlayerSAO *playersao = player->getPlayerSAO();
1109         if (playersao == NULL) {
1110                 errorstream << "Server::ProcessData(): Canceling: "
1111                                 "No player object for peer_id=" << pkt->getPeerId()
1112                                 << " disconnecting peer!" << std::endl;
1113                 m_con.DisconnectPeer(pkt->getPeerId());
1114                 return;
1115         }
1116
1117         if (g_settings->getBool("enable_damage")) {
1118                 if (playersao->isDead()) {
1119                         verbosestream << "Server::ProcessData(): Info: "
1120                                 "Ignoring damage as player " << player->getName()
1121                                 << " is already dead." << std::endl;
1122                         return;
1123                 }
1124
1125                 actionstream << player->getName() << " damaged by "
1126                                 << (int)damage << " hp at " << PP(playersao->getBasePosition() / BS)
1127                                 << std::endl;
1128
1129                 playersao->setHP(playersao->getHP() - damage);
1130                 SendPlayerHPOrDie(playersao);
1131         }
1132 }
1133
1134 void Server::handleCommand_Password(NetworkPacket* pkt)
1135 {
1136         if (pkt->getSize() != PASSWORD_SIZE * 2)
1137                 return;
1138
1139         std::string oldpwd;
1140         std::string newpwd;
1141
1142         // Deny for clients using the new protocol
1143         RemoteClient* client = getClient(pkt->getPeerId(), CS_Created);
1144         if (client->net_proto_version >= 25) {
1145                 infostream << "Server::handleCommand_Password(): Denying change: "
1146                         << " Client protocol version for peer_id=" << pkt->getPeerId()
1147                         << " too new!" << std::endl;
1148                 return;
1149         }
1150
1151         for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
1152                 char c = pkt->getChar(i);
1153                 if (c == 0)
1154                         break;
1155                 oldpwd += c;
1156         }
1157
1158         for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
1159                 char c = pkt->getChar(PASSWORD_SIZE + i);
1160                 if (c == 0)
1161                         break;
1162                 newpwd += c;
1163         }
1164
1165         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1166         if (player == NULL) {
1167                 errorstream << "Server::ProcessData(): Canceling: "
1168                                 "No player for peer_id=" << pkt->getPeerId()
1169                                 << " disconnecting peer!" << std::endl;
1170                 m_con.DisconnectPeer(pkt->getPeerId());
1171                 return;
1172         }
1173
1174         if (!base64_is_valid(newpwd)) {
1175                 infostream<<"Server: " << player->getName() <<
1176                                 " supplied invalid password hash" << std::endl;
1177                 // Wrong old password supplied!!
1178                 SendChatMessage(pkt->getPeerId(), ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
1179                                 L"Invalid new password hash supplied. Password NOT changed."));
1180                 return;
1181         }
1182
1183         infostream << "Server: Client requests a password change from "
1184                         << "'" << oldpwd << "' to '" << newpwd << "'" << std::endl;
1185
1186         std::string playername = player->getName();
1187
1188         std::string checkpwd;
1189         m_script->getAuth(playername, &checkpwd, NULL);
1190
1191         if (oldpwd != checkpwd) {
1192                 infostream << "Server: invalid old password" << std::endl;
1193                 // Wrong old password supplied!!
1194                 SendChatMessage(pkt->getPeerId(), ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
1195                                 L"Invalid old password supplied. Password NOT changed."));
1196                 return;
1197         }
1198
1199         bool success = m_script->setPassword(playername, newpwd);
1200         if (success) {
1201                 actionstream << player->getName() << " changes password" << std::endl;
1202                 SendChatMessage(pkt->getPeerId(), ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
1203                                 L"Password change successful."));
1204         } else {
1205                 actionstream << player->getName() << " tries to change password but "
1206                                 << "it fails" << std::endl;
1207                 SendChatMessage(pkt->getPeerId(), ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
1208                                 L"Password change failed or unavailable."));
1209         }
1210 }
1211
1212 void Server::handleCommand_PlayerItem(NetworkPacket* pkt)
1213 {
1214         if (pkt->getSize() < 2)
1215                 return;
1216
1217         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1218
1219         if (player == NULL) {
1220                 errorstream << "Server::ProcessData(): Canceling: "
1221                                 "No player for peer_id=" << pkt->getPeerId()
1222                                 << " disconnecting peer!" << std::endl;
1223                 m_con.DisconnectPeer(pkt->getPeerId());
1224                 return;
1225         }
1226
1227         PlayerSAO *playersao = player->getPlayerSAO();
1228         if (playersao == NULL) {
1229                 errorstream << "Server::ProcessData(): Canceling: "
1230                                 "No player object for peer_id=" << pkt->getPeerId()
1231                                 << " disconnecting peer!" << std::endl;
1232                 m_con.DisconnectPeer(pkt->getPeerId());
1233                 return;
1234         }
1235
1236         u16 item;
1237
1238         *pkt >> item;
1239
1240         playersao->setWieldIndex(item);
1241 }
1242
1243 void Server::handleCommand_Respawn(NetworkPacket* pkt)
1244 {
1245         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1246         if (player == NULL) {
1247                 errorstream << "Server::ProcessData(): Canceling: "
1248                                 "No player for peer_id=" << pkt->getPeerId()
1249                                 << " disconnecting peer!" << std::endl;
1250                 m_con.DisconnectPeer(pkt->getPeerId());
1251                 return;
1252         }
1253
1254         PlayerSAO *playersao = player->getPlayerSAO();
1255         assert(playersao);
1256
1257         if (!playersao->isDead())
1258                 return;
1259
1260         RespawnPlayer(pkt->getPeerId());
1261
1262         actionstream << player->getName() << " respawns at "
1263                         << PP(playersao->getBasePosition() / BS) << std::endl;
1264
1265         // ActiveObject is added to environment in AsyncRunStep after
1266         // the previous addition has been successfully removed
1267 }
1268
1269 void Server::handleCommand_Interact(NetworkPacket* pkt)
1270 {
1271         /*
1272                 [0] u16 command
1273                 [2] u8 action
1274                 [3] u16 item
1275                 [5] u32 length of the next item (plen)
1276                 [9] serialized PointedThing
1277                 [9 + plen] player position information
1278                 actions:
1279                 0: start digging (from undersurface) or use
1280                 1: stop digging (all parameters ignored)
1281                 2: digging completed
1282                 3: place block or item (to abovesurface)
1283                 4: use item
1284                 5: rightclick air ("activate")
1285         */
1286         u8 action;
1287         u16 item_i;
1288         *pkt >> action;
1289         *pkt >> item_i;
1290         std::istringstream tmp_is(pkt->readLongString(), std::ios::binary);
1291         PointedThing pointed;
1292         pointed.deSerialize(tmp_is);
1293
1294         verbosestream << "TOSERVER_INTERACT: action=" << (int)action << ", item="
1295                         << item_i << ", pointed=" << pointed.dump() << std::endl;
1296
1297         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1298
1299         if (player == NULL) {
1300                 errorstream << "Server::ProcessData(): Canceling: "
1301                                 "No player for peer_id=" << pkt->getPeerId()
1302                                 << " disconnecting peer!" << std::endl;
1303                 m_con.DisconnectPeer(pkt->getPeerId());
1304                 return;
1305         }
1306
1307         PlayerSAO *playersao = player->getPlayerSAO();
1308         if (playersao == NULL) {
1309                 errorstream << "Server::ProcessData(): Canceling: "
1310                                 "No player object for peer_id=" << pkt->getPeerId()
1311                                 << " disconnecting peer!" << std::endl;
1312                 m_con.DisconnectPeer(pkt->getPeerId());
1313                 return;
1314         }
1315
1316         if (playersao->isDead()) {
1317                 actionstream << "Server: NoCheat: " << player->getName()
1318                                 << " tried to interact while dead; ignoring." << std::endl;
1319                 if (pointed.type == POINTEDTHING_NODE) {
1320                         // Re-send block to revert change on client-side
1321                         RemoteClient *client = getClient(pkt->getPeerId());
1322                         v3s16 blockpos = getNodeBlockPos(pointed.node_undersurface);
1323                         client->SetBlockNotSent(blockpos);
1324                 }
1325                 // Call callbacks
1326                 m_script->on_cheat(playersao, "interacted_while_dead");
1327                 return;
1328         }
1329
1330         process_PlayerPos(player, playersao, pkt);
1331
1332         v3f player_pos = playersao->getLastGoodPosition();
1333
1334         // Update wielded item
1335         playersao->setWieldIndex(item_i);
1336
1337         // Get pointed to node (undefined if not POINTEDTYPE_NODE)
1338         v3s16 p_under = pointed.node_undersurface;
1339         v3s16 p_above = pointed.node_abovesurface;
1340
1341         // Get pointed to object (NULL if not POINTEDTYPE_OBJECT)
1342         ServerActiveObject *pointed_object = NULL;
1343         if (pointed.type == POINTEDTHING_OBJECT) {
1344                 pointed_object = m_env->getActiveObject(pointed.object_id);
1345                 if (pointed_object == NULL) {
1346                         verbosestream << "TOSERVER_INTERACT: "
1347                                 "pointed object is NULL" << std::endl;
1348                         return;
1349                 }
1350
1351         }
1352
1353         v3f pointed_pos_under = player_pos;
1354         v3f pointed_pos_above = player_pos;
1355         if (pointed.type == POINTEDTHING_NODE) {
1356                 pointed_pos_under = intToFloat(p_under, BS);
1357                 pointed_pos_above = intToFloat(p_above, BS);
1358         }
1359         else if (pointed.type == POINTEDTHING_OBJECT) {
1360                 pointed_pos_under = pointed_object->getBasePosition();
1361                 pointed_pos_above = pointed_pos_under;
1362         }
1363
1364         /*
1365                 Make sure the player is allowed to do it
1366         */
1367         if (!checkPriv(player->getName(), "interact")) {
1368                 actionstream<<player->getName()<<" attempted to interact with "
1369                                 <<pointed.dump()<<" without 'interact' privilege"
1370                                 <<std::endl;
1371                 // Re-send block to revert change on client-side
1372                 RemoteClient *client = getClient(pkt->getPeerId());
1373                 // Digging completed -> under
1374                 if (action == 2) {
1375                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1376                         client->SetBlockNotSent(blockpos);
1377                 }
1378                 // Placement -> above
1379                 if (action == 3) {
1380                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
1381                         client->SetBlockNotSent(blockpos);
1382                 }
1383                 return;
1384         }
1385
1386         /*
1387                 Check that target is reasonably close
1388                 (only when digging or placing things)
1389         */
1390         static thread_local const bool enable_anticheat =
1391                         !g_settings->getBool("disable_anticheat");
1392
1393         if ((action == 0 || action == 2 || action == 3 || action == 4) &&
1394                         (enable_anticheat && !isSingleplayer())) {
1395                 float d = player_pos.getDistanceFrom(pointed_pos_under);
1396                 const ItemDefinition &playeritem_def =
1397                         playersao->getWieldedItem().getDefinition(m_itemdef);
1398                 float max_d = BS * playeritem_def.range;
1399                 InventoryList *hlist = playersao->getInventory()->getList("hand");
1400                 const ItemDefinition &hand_def =
1401                         hlist ? (hlist->getItem(0).getDefinition(m_itemdef)) : (m_itemdef->get(""));
1402                 float max_d_hand = BS * hand_def.range;
1403                 if (max_d < 0 && max_d_hand >= 0)
1404                         max_d = max_d_hand;
1405                 else if (max_d < 0)
1406                         max_d = BS * 4.0;
1407                 // cube diagonal: sqrt(3) = 1.73
1408                 if (d > max_d * 1.73) {
1409                         actionstream << "Player " << player->getName()
1410                                         << " tried to access " << pointed.dump()
1411                                         << " from too far: "
1412                                         << "d=" << d <<", max_d=" << max_d
1413                                         << ". ignoring." << std::endl;
1414                         // Re-send block to revert change on client-side
1415                         RemoteClient *client = getClient(pkt->getPeerId());
1416                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1417                         client->SetBlockNotSent(blockpos);
1418                         // Call callbacks
1419                         m_script->on_cheat(playersao, "interacted_too_far");
1420                         // Do nothing else
1421                         return;
1422                 }
1423         }
1424
1425         /*
1426                 If something goes wrong, this player is to blame
1427         */
1428         RollbackScopeActor rollback_scope(m_rollback,
1429                         std::string("player:")+player->getName());
1430
1431         /*
1432                 0: start digging or punch object
1433         */
1434         if (action == 0) {
1435                 if (pointed.type == POINTEDTHING_NODE) {
1436                         MapNode n(CONTENT_IGNORE);
1437                         bool pos_ok;
1438
1439                         n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1440                         if (!pos_ok) {
1441                                 infostream << "Server: Not punching: Node not found."
1442                                                 << " Adding block to emerge queue."
1443                                                 << std::endl;
1444                                 m_emerge->enqueueBlockEmerge(pkt->getPeerId(),
1445                                         getNodeBlockPos(p_above), false);
1446                         }
1447
1448                         if (n.getContent() != CONTENT_IGNORE)
1449                                 m_script->node_on_punch(p_under, n, playersao, pointed);
1450
1451                         // Cheat prevention
1452                         playersao->noCheatDigStart(p_under);
1453                 }
1454                 else if (pointed.type == POINTEDTHING_OBJECT) {
1455                         // Skip if object has been removed
1456                         if (pointed_object->m_removed)
1457                                 return;
1458
1459                         actionstream<<player->getName()<<" punches object "
1460                                         <<pointed.object_id<<": "
1461                                         <<pointed_object->getDescription()<<std::endl;
1462
1463                         ItemStack punchitem = playersao->getWieldedItemOrHand();
1464                         ToolCapabilities toolcap =
1465                                         punchitem.getToolCapabilities(m_itemdef);
1466                         v3f dir = (pointed_object->getBasePosition() -
1467                                         (playersao->getBasePosition() + playersao->getEyeOffset())
1468                                                 ).normalize();
1469                         float time_from_last_punch =
1470                                 playersao->resetTimeFromLastPunch();
1471
1472                         s16 src_original_hp = pointed_object->getHP();
1473                         s16 dst_origin_hp = playersao->getHP();
1474
1475                         pointed_object->punch(dir, &toolcap, playersao,
1476                                         time_from_last_punch);
1477
1478                         // If the object is a player and its HP changed
1479                         if (src_original_hp != pointed_object->getHP() &&
1480                                         pointed_object->getType() == ACTIVEOBJECT_TYPE_PLAYER) {
1481                                 SendPlayerHPOrDie((PlayerSAO *)pointed_object);
1482                         }
1483
1484                         // If the puncher is a player and its HP changed
1485                         if (dst_origin_hp != playersao->getHP())
1486                                 SendPlayerHPOrDie(playersao);
1487                 }
1488
1489         } // action == 0
1490
1491         /*
1492                 1: stop digging
1493         */
1494         else if (action == 1) {
1495         } // action == 1
1496
1497         /*
1498                 2: Digging completed
1499         */
1500         else if (action == 2) {
1501                 // Only digging of nodes
1502                 if (pointed.type == POINTEDTHING_NODE) {
1503                         bool pos_ok;
1504                         MapNode n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1505                         if (!pos_ok) {
1506                                 infostream << "Server: Not finishing digging: Node not found."
1507                                                 << " Adding block to emerge queue."
1508                                                 << std::endl;
1509                                 m_emerge->enqueueBlockEmerge(pkt->getPeerId(),
1510                                         getNodeBlockPos(p_above), false);
1511                         }
1512
1513                         /* Cheat prevention */
1514                         bool is_valid_dig = true;
1515                         if (enable_anticheat && !isSingleplayer()) {
1516                                 v3s16 nocheat_p = playersao->getNoCheatDigPos();
1517                                 float nocheat_t = playersao->getNoCheatDigTime();
1518                                 playersao->noCheatDigEnd();
1519                                 // If player didn't start digging this, ignore dig
1520                                 if (nocheat_p != p_under) {
1521                                         infostream << "Server: NoCheat: " << player->getName()
1522                                                         << " started digging "
1523                                                         << PP(nocheat_p) << " and completed digging "
1524                                                         << PP(p_under) << "; not digging." << std::endl;
1525                                         is_valid_dig = false;
1526                                         // Call callbacks
1527                                         m_script->on_cheat(playersao, "finished_unknown_dig");
1528                                 }
1529                                 // Get player's wielded item
1530                                 ItemStack playeritem = playersao->getWieldedItemOrHand();
1531                                 ToolCapabilities playeritem_toolcap =
1532                                                 playeritem.getToolCapabilities(m_itemdef);
1533                                 // Get diggability and expected digging time
1534                                 DigParams params = getDigParams(m_nodedef->get(n).groups,
1535                                                 &playeritem_toolcap);
1536                                 // If can't dig, try hand
1537                                 if (!params.diggable) {
1538                                         InventoryList *hlist = playersao->getInventory()->getList("hand");
1539                                         const ItemDefinition &hand =
1540                                                 hlist ? hlist->getItem(0).getDefinition(m_itemdef) : m_itemdef->get("");
1541                                         const ToolCapabilities *tp = hand.tool_capabilities;
1542                                         if (tp)
1543                                                 params = getDigParams(m_nodedef->get(n).groups, tp);
1544                                 }
1545                                 // If can't dig, ignore dig
1546                                 if (!params.diggable) {
1547                                         infostream << "Server: NoCheat: " << player->getName()
1548                                                         << " completed digging " << PP(p_under)
1549                                                         << ", which is not diggable with tool. not digging."
1550                                                         << std::endl;
1551                                         is_valid_dig = false;
1552                                         // Call callbacks
1553                                         m_script->on_cheat(playersao, "dug_unbreakable");
1554                                 }
1555                                 // Check digging time
1556                                 // If already invalidated, we don't have to
1557                                 if (!is_valid_dig) {
1558                                         // Well not our problem then
1559                                 }
1560                                 // Clean and long dig
1561                                 else if (params.time > 2.0 && nocheat_t * 1.2 > params.time) {
1562                                         // All is good, but grab time from pool; don't care if
1563                                         // it's actually available
1564                                         playersao->getDigPool().grab(params.time);
1565                                 }
1566                                 // Short or laggy dig
1567                                 // Try getting the time from pool
1568                                 else if (playersao->getDigPool().grab(params.time)) {
1569                                         // All is good
1570                                 }
1571                                 // Dig not possible
1572                                 else {
1573                                         infostream << "Server: NoCheat: " << player->getName()
1574                                                         << " completed digging " << PP(p_under)
1575                                                         << "too fast; not digging." << std::endl;
1576                                         is_valid_dig = false;
1577                                         // Call callbacks
1578                                         m_script->on_cheat(playersao, "dug_too_fast");
1579                                 }
1580                         }
1581
1582                         /* Actually dig node */
1583
1584                         if (is_valid_dig && n.getContent() != CONTENT_IGNORE)
1585                                 m_script->node_on_dig(p_under, n, playersao);
1586
1587                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1588                         RemoteClient *client = getClient(pkt->getPeerId());
1589                         // Send unusual result (that is, node not being removed)
1590                         if (m_env->getMap().getNodeNoEx(p_under).getContent() != CONTENT_AIR) {
1591                                 // Re-send block to revert change on client-side
1592                                 client->SetBlockNotSent(blockpos);
1593                         }
1594                         else {
1595                                 client->ResendBlockIfOnWire(blockpos);
1596                         }
1597                 }
1598         } // action == 2
1599
1600         /*
1601                 3: place block or right-click object
1602         */
1603         else if (action == 3) {
1604                 ItemStack item = playersao->getWieldedItem();
1605
1606                 // Reset build time counter
1607                 if (pointed.type == POINTEDTHING_NODE &&
1608                                 item.getDefinition(m_itemdef).type == ITEM_NODE)
1609                         getClient(pkt->getPeerId())->m_time_from_building = 0.0;
1610
1611                 if (pointed.type == POINTEDTHING_OBJECT) {
1612                         // Right click object
1613
1614                         // Skip if object has been removed
1615                         if (pointed_object->m_removed)
1616                                 return;
1617
1618                         actionstream << player->getName() << " right-clicks object "
1619                                         << pointed.object_id << ": "
1620                                         << pointed_object->getDescription() << std::endl;
1621
1622                         // Do stuff
1623                         pointed_object->rightClick(playersao);
1624                 }
1625                 else if (m_script->item_OnPlace(
1626                                 item, playersao, pointed)) {
1627                         // Placement was handled in lua
1628
1629                         // Apply returned ItemStack
1630                         if (playersao->setWieldedItem(item)) {
1631                                 SendInventory(playersao);
1632                         }
1633                 }
1634
1635                 // If item has node placement prediction, always send the
1636                 // blocks to make sure the client knows what exactly happened
1637                 RemoteClient *client = getClient(pkt->getPeerId());
1638                 v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
1639                 v3s16 blockpos2 = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1640                 if (item.getDefinition(m_itemdef).node_placement_prediction != "") {
1641                         client->SetBlockNotSent(blockpos);
1642                         if (blockpos2 != blockpos) {
1643                                 client->SetBlockNotSent(blockpos2);
1644                         }
1645                 }
1646                 else {
1647                         client->ResendBlockIfOnWire(blockpos);
1648                         if (blockpos2 != blockpos) {
1649                                 client->ResendBlockIfOnWire(blockpos2);
1650                         }
1651                 }
1652         } // action == 3
1653
1654         /*
1655                 4: use
1656         */
1657         else if (action == 4) {
1658                 ItemStack item = playersao->getWieldedItem();
1659
1660                 actionstream << player->getName() << " uses " << item.name
1661                                 << ", pointing at " << pointed.dump() << std::endl;
1662
1663                 if (m_script->item_OnUse(
1664                                 item, playersao, pointed)) {
1665                         // Apply returned ItemStack
1666                         if (playersao->setWieldedItem(item)) {
1667                                 SendInventory(playersao);
1668                         }
1669                 }
1670
1671         } // action == 4
1672
1673         /*
1674                 5: rightclick air
1675         */
1676         else if (action == 5) {
1677                 ItemStack item = playersao->getWieldedItem();
1678
1679                 actionstream << player->getName() << " activates "
1680                                 << item.name << std::endl;
1681
1682                 if (m_script->item_OnSecondaryUse(
1683                                 item, playersao)) {
1684                         if( playersao->setWieldedItem(item)) {
1685                                 SendInventory(playersao);
1686                         }
1687                 }
1688         }
1689
1690
1691         /*
1692                 Catch invalid actions
1693         */
1694         else {
1695                 warningstream << "Server: Invalid action "
1696                                 << action << std::endl;
1697         }
1698 }
1699
1700 void Server::handleCommand_RemovedSounds(NetworkPacket* pkt)
1701 {
1702         u16 num;
1703         *pkt >> num;
1704         for (u16 k = 0; k < num; k++) {
1705                 s32 id;
1706
1707                 *pkt >> id;
1708
1709                 std::unordered_map<s32, ServerPlayingSound>::iterator i =
1710                         m_playing_sounds.find(id);
1711                 if (i == m_playing_sounds.end())
1712                         continue;
1713
1714                 ServerPlayingSound &psound = i->second;
1715                 psound.clients.erase(pkt->getPeerId());
1716                 if (psound.clients.empty())
1717                         m_playing_sounds.erase(i++);
1718         }
1719 }
1720
1721 void Server::handleCommand_NodeMetaFields(NetworkPacket* pkt)
1722 {
1723         v3s16 p;
1724         std::string formname;
1725         u16 num;
1726
1727         *pkt >> p >> formname >> num;
1728
1729         StringMap fields;
1730         for (u16 k = 0; k < num; k++) {
1731                 std::string fieldname;
1732                 *pkt >> fieldname;
1733                 fields[fieldname] = pkt->readLongString();
1734         }
1735
1736         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1737
1738         if (player == NULL) {
1739                 errorstream << "Server::ProcessData(): Canceling: "
1740                                 "No player for peer_id=" << pkt->getPeerId()
1741                                 << " disconnecting peer!" << std::endl;
1742                 m_con.DisconnectPeer(pkt->getPeerId());
1743                 return;
1744         }
1745
1746         PlayerSAO *playersao = player->getPlayerSAO();
1747         if (playersao == NULL) {
1748                 errorstream << "Server::ProcessData(): Canceling: "
1749                                 "No player object for peer_id=" << pkt->getPeerId()
1750                                 << " disconnecting peer!"  << std::endl;
1751                 m_con.DisconnectPeer(pkt->getPeerId());
1752                 return;
1753         }
1754
1755         // If something goes wrong, this player is to blame
1756         RollbackScopeActor rollback_scope(m_rollback,
1757                         std::string("player:")+player->getName());
1758
1759         // Check the target node for rollback data; leave others unnoticed
1760         RollbackNode rn_old(&m_env->getMap(), p, this);
1761
1762         m_script->node_on_receive_fields(p, formname, fields, playersao);
1763
1764         // Report rollback data
1765         RollbackNode rn_new(&m_env->getMap(), p, this);
1766         if (rollback() && rn_new != rn_old) {
1767                 RollbackAction action;
1768                 action.setSetNode(p, rn_old, rn_new);
1769                 rollback()->reportAction(action);
1770         }
1771 }
1772
1773 void Server::handleCommand_InventoryFields(NetworkPacket* pkt)
1774 {
1775         std::string formname;
1776         u16 num;
1777
1778         *pkt >> formname >> num;
1779
1780         StringMap fields;
1781         for (u16 k = 0; k < num; k++) {
1782                 std::string fieldname;
1783                 *pkt >> fieldname;
1784                 fields[fieldname] = pkt->readLongString();
1785         }
1786
1787         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1788
1789         if (player == NULL) {
1790                 errorstream << "Server::ProcessData(): Canceling: "
1791                                 "No player for peer_id=" << pkt->getPeerId()
1792                                 << " disconnecting peer!" << std::endl;
1793                 m_con.DisconnectPeer(pkt->getPeerId());
1794                 return;
1795         }
1796
1797         PlayerSAO *playersao = player->getPlayerSAO();
1798         if (playersao == NULL) {
1799                 errorstream << "Server::ProcessData(): Canceling: "
1800                                 "No player object for peer_id=" << pkt->getPeerId()
1801                                 << " disconnecting peer!" << std::endl;
1802                 m_con.DisconnectPeer(pkt->getPeerId());
1803                 return;
1804         }
1805
1806         m_script->on_playerReceiveFields(playersao, formname, fields);
1807 }
1808
1809 void Server::handleCommand_FirstSrp(NetworkPacket* pkt)
1810 {
1811         RemoteClient* client = getClient(pkt->getPeerId(), CS_Invalid);
1812         ClientState cstate = client->getState();
1813
1814         std::string playername = client->getName();
1815
1816         std::string salt;
1817         std::string verification_key;
1818
1819         std::string addr_s = getPeerAddress(pkt->getPeerId()).serializeString();
1820         u8 is_empty;
1821
1822         *pkt >> salt >> verification_key >> is_empty;
1823
1824         verbosestream << "Server: Got TOSERVER_FIRST_SRP from " << addr_s
1825                 << ", with is_empty=" << (is_empty == 1) << std::endl;
1826
1827         // Either this packet is sent because the user is new or to change the password
1828         if (cstate == CS_HelloSent) {
1829                 if (!client->isMechAllowed(AUTH_MECHANISM_FIRST_SRP)) {
1830                         actionstream << "Server: Client from " << addr_s
1831                                         << " tried to set password without being "
1832                                         << "authenticated, or the username being new." << std::endl;
1833                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1834                         return;
1835                 }
1836
1837                 if (!isSingleplayer() &&
1838                                 g_settings->getBool("disallow_empty_password") &&
1839                                 is_empty == 1) {
1840                         actionstream << "Server: " << playername
1841                                         << " supplied empty password from " << addr_s << std::endl;
1842                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_EMPTY_PASSWORD);
1843                         return;
1844                 }
1845
1846                 std::string initial_ver_key;
1847
1848                 initial_ver_key = encode_srp_verifier(verification_key, salt);
1849                 m_script->createAuth(playername, initial_ver_key);
1850
1851                 acceptAuth(pkt->getPeerId(), false);
1852         } else {
1853                 if (cstate < CS_SudoMode) {
1854                         infostream << "Server::ProcessData(): Ignoring TOSERVER_FIRST_SRP from "
1855                                         << addr_s << ": " << "Client has wrong state " << cstate << "."
1856                                         << std::endl;
1857                         return;
1858                 }
1859                 m_clients.event(pkt->getPeerId(), CSE_SudoLeave);
1860                 std::string pw_db_field = encode_srp_verifier(verification_key, salt);
1861                 bool success = m_script->setPassword(playername, pw_db_field);
1862                 if (success) {
1863                         actionstream << playername << " changes password" << std::endl;
1864                         SendChatMessage(pkt->getPeerId(), ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
1865                                         L"Password change successful."));
1866                 } else {
1867                         actionstream << playername << " tries to change password but "
1868                                 << "it fails" << std::endl;
1869                         SendChatMessage(pkt->getPeerId(), ChatMessage(CHATMESSAGE_TYPE_SYSTEM,
1870                                         L"Password change failed or unavailable."));
1871                 }
1872         }
1873 }
1874
1875 void Server::handleCommand_SrpBytesA(NetworkPacket* pkt)
1876 {
1877         RemoteClient* client = getClient(pkt->getPeerId(), CS_Invalid);
1878         ClientState cstate = client->getState();
1879
1880         bool wantSudo = (cstate == CS_Active);
1881
1882         if (!((cstate == CS_HelloSent) || (cstate == CS_Active))) {
1883                 actionstream << "Server: got SRP _A packet in wrong state "
1884                         << cstate << " from "
1885                         << getPeerAddress(pkt->getPeerId()).serializeString()
1886                         << ". Ignoring." << std::endl;
1887                 return;
1888         }
1889
1890         if (client->chosen_mech != AUTH_MECHANISM_NONE) {
1891                 actionstream << "Server: got SRP _A packet, while auth"
1892                         << "is already going on with mech " << client->chosen_mech
1893                         << " from " << getPeerAddress(pkt->getPeerId()).serializeString()
1894                         << " (wantSudo=" << wantSudo << "). Ignoring." << std::endl;
1895                 if (wantSudo) {
1896                         DenySudoAccess(pkt->getPeerId());
1897                         return;
1898                 } else {
1899                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1900                         return;
1901                 }
1902         }
1903
1904         std::string bytes_A;
1905         u8 based_on;
1906         *pkt >> bytes_A >> based_on;
1907
1908         infostream << "Server: TOSERVER_SRP_BYTES_A received with "
1909                 << "based_on=" << int(based_on) << " and len_A="
1910                 << bytes_A.length() << "." << std::endl;
1911
1912         AuthMechanism chosen = (based_on == 0) ?
1913                 AUTH_MECHANISM_LEGACY_PASSWORD : AUTH_MECHANISM_SRP;
1914
1915         if (wantSudo) {
1916                 if (!client->isSudoMechAllowed(chosen)) {
1917                         actionstream << "Server: Player \"" << client->getName()
1918                                 << "\" at " << getPeerAddress(pkt->getPeerId()).serializeString()
1919                                 << " tried to change password using unallowed mech "
1920                                 << chosen << "." << std::endl;
1921                         DenySudoAccess(pkt->getPeerId());
1922                         return;
1923                 }
1924         } else {
1925                 if (!client->isMechAllowed(chosen)) {
1926                         actionstream << "Server: Client tried to authenticate from "
1927                                 << getPeerAddress(pkt->getPeerId()).serializeString()
1928                                 << " using unallowed mech " << chosen << "." << std::endl;
1929                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1930                         return;
1931                 }
1932         }
1933
1934         client->chosen_mech = chosen;
1935
1936         std::string salt;
1937         std::string verifier;
1938
1939         if (based_on == 0) {
1940
1941                 generate_srp_verifier_and_salt(client->getName(), client->enc_pwd,
1942                         &verifier, &salt);
1943         } else if (!decode_srp_verifier_and_salt(client->enc_pwd, &verifier, &salt)) {
1944                 // Non-base64 errors should have been catched in the init handler
1945                 actionstream << "Server: User " << client->getName()
1946                         << " tried to log in, but srp verifier field"
1947                         << " was invalid (most likely invalid base64)." << std::endl;
1948                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
1949                 return;
1950         }
1951
1952         char *bytes_B = 0;
1953         size_t len_B = 0;
1954
1955         client->auth_data = srp_verifier_new(SRP_SHA256, SRP_NG_2048,
1956                 client->getName().c_str(),
1957                 (const unsigned char *) salt.c_str(), salt.size(),
1958                 (const unsigned char *) verifier.c_str(), verifier.size(),
1959                 (const unsigned char *) bytes_A.c_str(), bytes_A.size(),
1960                 NULL, 0,
1961                 (unsigned char **) &bytes_B, &len_B, NULL, NULL);
1962
1963         if (!bytes_B) {
1964                 actionstream << "Server: User " << client->getName()
1965                         << " tried to log in, SRP-6a safety check violated in _A handler."
1966                         << std::endl;
1967                 if (wantSudo) {
1968                         DenySudoAccess(pkt->getPeerId());
1969                         return;
1970                 } else {
1971                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1972                         return;
1973                 }
1974         }
1975
1976         NetworkPacket resp_pkt(TOCLIENT_SRP_BYTES_S_B, 0, pkt->getPeerId());
1977         resp_pkt << salt << std::string(bytes_B, len_B);
1978         Send(&resp_pkt);
1979 }
1980
1981 void Server::handleCommand_SrpBytesM(NetworkPacket* pkt)
1982 {
1983         RemoteClient* client = getClient(pkt->getPeerId(), CS_Invalid);
1984         ClientState cstate = client->getState();
1985
1986         bool wantSudo = (cstate == CS_Active);
1987
1988         verbosestream << "Server: Recieved TOCLIENT_SRP_BYTES_M." << std::endl;
1989
1990         if (!((cstate == CS_HelloSent) || (cstate == CS_Active))) {
1991                 actionstream << "Server: got SRP _M packet in wrong state "
1992                         << cstate << " from "
1993                         << getPeerAddress(pkt->getPeerId()).serializeString()
1994                         << ". Ignoring." << std::endl;
1995                 return;
1996         }
1997
1998         if ((client->chosen_mech != AUTH_MECHANISM_SRP)
1999                 && (client->chosen_mech != AUTH_MECHANISM_LEGACY_PASSWORD)) {
2000                 actionstream << "Server: got SRP _M packet, while auth"
2001                         << "is going on with mech " << client->chosen_mech
2002                         << " from " << getPeerAddress(pkt->getPeerId()).serializeString()
2003                         << " (wantSudo=" << wantSudo << "). Denying." << std::endl;
2004                 if (wantSudo) {
2005                         DenySudoAccess(pkt->getPeerId());
2006                         return;
2007                 } else {
2008                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
2009                         return;
2010                 }
2011         }
2012
2013         std::string bytes_M;
2014         *pkt >> bytes_M;
2015
2016         if (srp_verifier_get_session_key_length((SRPVerifier *) client->auth_data)
2017                         != bytes_M.size()) {
2018                 actionstream << "Server: User " << client->getName()
2019                         << " at " << getPeerAddress(pkt->getPeerId()).serializeString()
2020                         << " sent bytes_M with invalid length " << bytes_M.size() << std::endl;
2021                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
2022                 return;
2023         }
2024
2025         unsigned char *bytes_HAMK = 0;
2026
2027         srp_verifier_verify_session((SRPVerifier *) client->auth_data,
2028                 (unsigned char *)bytes_M.c_str(), &bytes_HAMK);
2029
2030         if (!bytes_HAMK) {
2031                 if (wantSudo) {
2032                         actionstream << "Server: User " << client->getName()
2033                                 << " at " << getPeerAddress(pkt->getPeerId()).serializeString()
2034                                 << " tried to change their password, but supplied wrong"
2035                                 << " (SRP) password for authentication." << std::endl;
2036                         DenySudoAccess(pkt->getPeerId());
2037                         return;
2038                 } else {
2039                         actionstream << "Server: User " << client->getName()
2040                                 << " at " << getPeerAddress(pkt->getPeerId()).serializeString()
2041                                 << " supplied wrong password (auth mechanism: SRP)."
2042                                 << std::endl;
2043                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_PASSWORD);
2044                         return;
2045                 }
2046         }
2047
2048         if (client->create_player_on_auth_success) {
2049                 std::string playername = client->getName();
2050                 m_script->createAuth(playername, client->enc_pwd);
2051
2052                 std::string checkpwd; // not used, but needed for passing something
2053                 if (!m_script->getAuth(playername, &checkpwd, NULL)) {
2054                         actionstream << "Server: " << playername << " cannot be authenticated"
2055                                 << " (auth handler does not work?)" << std::endl;
2056                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
2057                         return;
2058                 }
2059                 client->create_player_on_auth_success = false;
2060         }
2061
2062         acceptAuth(pkt->getPeerId(), wantSudo);
2063 }