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 "server.h"
  21 #include "log.h"
  22
  23 #include "content_abm.h"
  24 #include "content_sao.h"
  25 #include "emerge.h"
  26 #include "nodedef.h"
  27 #include "player.h"
  28 #include "rollback_interface.h"
  29 #include "scripting_game.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.getClientIDs(CS_Created).size() >= g_settings->getU16("max_users") &&
 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 = getSRPVerifier(playerName, default_password);
 265                         auth_mechs |= AUTH_MECHANISM_SRP;
 266                         // Create auth, 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.getClientIDs(CS_Created).size() >= g_settings->getU16("max_users") &&
 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                         translatePassword(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         ///// begin compatibility code
 617         PlayerSAO* playersao = NULL;
 618         if (protocol_version <= 22) {
 619                 playersao = StageTwoClientInit(pkt->getPeerId());
 620
 621                 if (playersao == NULL) {
 622                         actionstream
 623                                 << "TOSERVER_INIT2 stage 2 client init failed for peer "
 624                                 << pkt->getPeerId() << std::endl;
 625                         return;
 626                 }
 627         }
 628         ///// end compatibility code
 629
 630         /*
 631                 Send some initialization data
 632         */
 633
 634         infostream << "Server: Sending content to "
 635                         << getPlayerName(pkt->getPeerId()) << std::endl;
 636
 637         // Send player movement settings
 638         SendMovement(pkt->getPeerId());
 639
 640         // Send item definitions
 641         SendItemDef(pkt->getPeerId(), m_itemdef, protocol_version);
 642
 643         // Send node definitions
 644         SendNodeDef(pkt->getPeerId(), m_nodedef, protocol_version);
 645
 646         m_clients.event(pkt->getPeerId(), CSE_SetDefinitionsSent);
 647
 648         // Send media announcement
 649         sendMediaAnnouncement(pkt->getPeerId());
 650
 651         // Send detached inventories
 652         sendDetachedInventories(pkt->getPeerId());
 653
 654         // Send time of day
 655         u16 time = m_env->getTimeOfDay();
 656         float time_speed = g_settings->getFloat("time_speed");
 657         SendTimeOfDay(pkt->getPeerId(), time, time_speed);
 658
 659         ///// begin compatibility code
 660         if (protocol_version <= 22) {
 661                 m_clients.event(pkt->getPeerId(), CSE_SetClientReady);
 662                 m_script->on_joinplayer(playersao);
 663         }
 664         ///// end compatibility code
 665
 666         // Warnings about protocol version can be issued here
 667         if (getClient(pkt->getPeerId())->net_proto_version < LATEST_PROTOCOL_VERSION) {
 668                 SendChatMessage(pkt->getPeerId(), L"# Server: WARNING: YOUR CLIENT'S "
 669                                 L"VERSION MAY NOT BE FULLY COMPATIBLE WITH THIS SERVER!");
 670         }
 671 }
 672
 673 void Server::handleCommand_RequestMedia(NetworkPacket* pkt)
 674 {
 675         std::vector<std::string> tosend;
 676         u16 numfiles;
 677
 678         *pkt >> numfiles;
 679
 680         infostream << "Sending " << numfiles << " files to "
 681                         << getPlayerName(pkt->getPeerId()) << std::endl;
 682         verbosestream << "TOSERVER_REQUEST_MEDIA: " << std::endl;
 683
 684         for (u16 i = 0; i < numfiles; i++) {
 685                 std::string name;
 686
 687                 *pkt >> name;
 688
 689                 tosend.push_back(name);
 690                 verbosestream << "TOSERVER_REQUEST_MEDIA: requested file "
 691                                 << name << std::endl;
 692         }
 693
 694         sendRequestedMedia(pkt->getPeerId(), tosend);
 695 }
 696
 697 void Server::handleCommand_ReceivedMedia(NetworkPacket* pkt)
 698 {
 699 }
 700
 701 void Server::handleCommand_ClientReady(NetworkPacket* pkt)
 702 {
 703         u16 peer_id = pkt->getPeerId();
 704         u16 peer_proto_ver = getClient(peer_id, CS_InitDone)->net_proto_version;
 705
 706         // clients <= protocol version 22 did not send ready message,
 707         // they're already initialized
 708         if (peer_proto_ver <= 22) {
 709                 infostream << "Client sent message not expected by a "
 710                         << "client using protocol version <= 22,"
 711                         << "disconnecting peer_id: " << peer_id << std::endl;
 712                 m_con.DisconnectPeer(peer_id);
 713                 return;
 714         }
 715
 716         PlayerSAO* playersao = StageTwoClientInit(peer_id);
 717
 718         if (playersao == NULL) {
 719                 actionstream
 720                         << "TOSERVER_CLIENT_READY stage 2 client init failed for peer_id: "
 721                         << peer_id << std::endl;
 722                 m_con.DisconnectPeer(peer_id);
 723                 return;
 724         }
 725
 726
 727         if (pkt->getSize() < 8) {
 728                 errorstream
 729                         << "TOSERVER_CLIENT_READY client sent inconsistent data, disconnecting peer_id: "
 730                         << peer_id << std::endl;
 731                 m_con.DisconnectPeer(peer_id);
 732                 return;
 733         }
 734
 735         u8 major_ver, minor_ver, patch_ver, reserved;
 736         std::string full_ver;
 737         *pkt >> major_ver >> minor_ver >> patch_ver >> reserved >> full_ver;
 738
 739         m_clients.setClientVersion(
 740                         peer_id, major_ver, minor_ver, patch_ver,
 741                         full_ver);
 742
 743         m_clients.event(peer_id, CSE_SetClientReady);
 744         m_script->on_joinplayer(playersao);
 745 }
 746
 747 void Server::handleCommand_GotBlocks(NetworkPacket* pkt)
 748 {
 749         if (pkt->getSize() < 1)
 750                 return;
 751
 752         /*
 753                 [0] u16 command
 754                 [2] u8 count
 755                 [3] v3s16 pos_0
 756                 [3+6] v3s16 pos_1
 757                 ...
 758         */
 759
 760         u8 count;
 761         *pkt >> count;
 762
 763         RemoteClient *client = getClient(pkt->getPeerId());
 764
 765         for (u16 i = 0; i < count; i++) {
 766                 if ((s16)pkt->getSize() < 1 + (i + 1) * 6)
 767                         throw con::InvalidIncomingDataException
 768                                 ("GOTBLOCKS length is too short");
 769                 v3s16 p;
 770
 771                 *pkt >> p;
 772
 773                 client->GotBlock(p);
 774         }
 775 }
 776
 777 void Server::handleCommand_PlayerPos(NetworkPacket* pkt)
 778 {
 779         if (pkt->getSize() < 12 + 12 + 4 + 4)
 780                 return;
 781
 782         v3s32 ps, ss;
 783         s32 f32pitch, f32yaw;
 784
 785         *pkt >> ps;
 786         *pkt >> ss;
 787         *pkt >> f32pitch;
 788         *pkt >> f32yaw;
 789
 790         f32 pitch = (f32)f32pitch / 100.0;
 791         f32 yaw = (f32)f32yaw / 100.0;
 792         u32 keyPressed = 0;
 793
 794         if (pkt->getSize() >= 12 + 12 + 4 + 4 + 4)
 795                 *pkt >> keyPressed;
 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 = modulo360f(yaw);
 802
 803         Player *player = m_env->getPlayer(pkt->getPeerId());
 804         if (player == NULL) {
 805                 errorstream << "Server::ProcessData(): Canceling: "
 806                                 "No player for peer_id=" << pkt->getPeerId()
 807                                 << " disconnecting peer!" << std::endl;
 808                 m_con.DisconnectPeer(pkt->getPeerId());
 809                 return;
 810         }
 811
 812         // If player is dead we don't care of this packet
 813         if (player->isDead()) {
 814                 verbosestream << "TOSERVER_PLAYERPOS: " << player->getName()
 815                         << " is dead. Ignoring packet";
 816                 return;
 817         }
 818
 819         PlayerSAO *playersao = player->getPlayerSAO();
 820         if (playersao == NULL) {
 821                 errorstream << "Server::ProcessData(): Canceling: "
 822                                 "No player object for peer_id=" << pkt->getPeerId()
 823                                 << " disconnecting peer!" << std::endl;
 824                 m_con.DisconnectPeer(pkt->getPeerId());
 825                 return;
 826         }
 827
 828         player->setPosition(position);
 829         player->setSpeed(speed);
 830         player->setPitch(pitch);
 831         player->setYaw(yaw);
 832         player->keyPressed = keyPressed;
 833         player->control.up = (keyPressed & 1);
 834         player->control.down = (keyPressed & 2);
 835         player->control.left = (keyPressed & 4);
 836         player->control.right = (keyPressed & 8);
 837         player->control.jump = (keyPressed & 16);
 838         player->control.aux1 = (keyPressed & 32);
 839         player->control.sneak = (keyPressed & 64);
 840         player->control.LMB = (keyPressed & 128);
 841         player->control.RMB = (keyPressed & 256);
 842
 843         if (playersao->checkMovementCheat()) {
 844                 // Call callbacks
 845                 m_script->on_cheat(playersao, "moved_too_fast");
 846                 SendMovePlayer(pkt->getPeerId());
 847         }
 848 }
 849
 850 void Server::handleCommand_DeletedBlocks(NetworkPacket* pkt)
 851 {
 852         if (pkt->getSize() < 1)
 853                 return;
 854
 855         /*
 856                 [0] u16 command
 857                 [2] u8 count
 858                 [3] v3s16 pos_0
 859                 [3+6] v3s16 pos_1
 860                 ...
 861         */
 862
 863         u8 count;
 864         *pkt >> count;
 865
 866         RemoteClient *client = getClient(pkt->getPeerId());
 867
 868         for (u16 i = 0; i < count; i++) {
 869                 if ((s16)pkt->getSize() < 1 + (i + 1) * 6)
 870                         throw con::InvalidIncomingDataException
 871                                 ("DELETEDBLOCKS length is too short");
 872                 v3s16 p;
 873                 *pkt >> p;
 874
 875                 client->SetBlockNotSent(p);
 876         }
 877 }
 878
 879 void Server::handleCommand_InventoryAction(NetworkPacket* pkt)
 880 {
 881         Player *player = m_env->getPlayer(pkt->getPeerId());
 882         if (player == NULL) {
 883                 errorstream << "Server::ProcessData(): Canceling: "
 884                                 "No player for peer_id=" << pkt->getPeerId()
 885                                 << " disconnecting peer!" << std::endl;
 886                 m_con.DisconnectPeer(pkt->getPeerId());
 887                 return;
 888         }
 889
 890         PlayerSAO *playersao = player->getPlayerSAO();
 891         if (playersao == NULL) {
 892                 errorstream << "Server::ProcessData(): Canceling: "
 893                                 "No player object for peer_id=" << pkt->getPeerId()
 894                                 << " disconnecting peer!" << std::endl;
 895                 m_con.DisconnectPeer(pkt->getPeerId());
 896                 return;
 897         }
 898
 899         // Strip command and create a stream
 900         std::string datastring(pkt->getString(0), pkt->getSize());
 901         verbosestream << "TOSERVER_INVENTORY_ACTION: data=" << datastring
 902                 << std::endl;
 903         std::istringstream is(datastring, std::ios_base::binary);
 904         // Create an action
 905         InventoryAction *a = InventoryAction::deSerialize(is);
 906         if (a == NULL) {
 907                 infostream << "TOSERVER_INVENTORY_ACTION: "
 908                                 << "InventoryAction::deSerialize() returned NULL"
 909                                 << std::endl;
 910                 return;
 911         }
 912
 913         // If something goes wrong, this player is to blame
 914         RollbackScopeActor rollback_scope(m_rollback,
 915                         std::string("player:")+player->getName());
 916
 917         /*
 918                 Note: Always set inventory not sent, to repair cases
 919                 where the client made a bad prediction.
 920         */
 921
 922         /*
 923                 Handle restrictions and special cases of the move action
 924         */
 925         if (a->getType() == IACTION_MOVE) {
 926                 IMoveAction *ma = (IMoveAction*)a;
 927
 928                 ma->from_inv.applyCurrentPlayer(player->getName());
 929                 ma->to_inv.applyCurrentPlayer(player->getName());
 930
 931                 setInventoryModified(ma->from_inv, false);
 932                 setInventoryModified(ma->to_inv, false);
 933
 934                 bool from_inv_is_current_player =
 935                         (ma->from_inv.type == InventoryLocation::PLAYER) &&
 936                         (ma->from_inv.name == player->getName());
 937
 938                 bool to_inv_is_current_player =
 939                         (ma->to_inv.type == InventoryLocation::PLAYER) &&
 940                         (ma->to_inv.name == player->getName());
 941
 942                 /*
 943                         Disable moving items out of craftpreview
 944                 */
 945                 if (ma->from_list == "craftpreview") {
 946                         infostream << "Ignoring IMoveAction from "
 947                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 948                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 949                                         << " because src is " << ma->from_list << std::endl;
 950                         delete a;
 951                         return;
 952                 }
 953
 954                 /*
 955                         Disable moving items into craftresult and craftpreview
 956                 */
 957                 if (ma->to_list == "craftpreview" || ma->to_list == "craftresult") {
 958                         infostream << "Ignoring IMoveAction from "
 959                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 960                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 961                                         << " because dst is " << ma->to_list << std::endl;
 962                         delete a;
 963                         return;
 964                 }
 965
 966                 // Disallow moving items in elsewhere than player's inventory
 967                 // if not allowed to interact
 968                 if (!checkPriv(player->getName(), "interact") &&
 969                                 (!from_inv_is_current_player ||
 970                                 !to_inv_is_current_player)) {
 971                         infostream << "Cannot move outside of player's inventory: "
 972                                         << "No interact privilege" << std::endl;
 973                         delete a;
 974                         return;
 975                 }
 976         }
 977         /*
 978                 Handle restrictions and special cases of the drop action
 979         */
 980         else if (a->getType() == IACTION_DROP) {
 981                 IDropAction *da = (IDropAction*)a;
 982
 983                 da->from_inv.applyCurrentPlayer(player->getName());
 984
 985                 setInventoryModified(da->from_inv, false);
 986
 987                 /*
 988                         Disable dropping items out of craftpreview
 989                 */
 990                 if (da->from_list == "craftpreview") {
 991                         infostream << "Ignoring IDropAction from "
 992                                         << (da->from_inv.dump()) << ":" << da->from_list
 993                                         << " because src is " << da->from_list << std::endl;
 994                         delete a;
 995                         return;
 996                 }
 997
 998                 // Disallow dropping items if not allowed to interact
 999                 if (!checkPriv(player->getName(), "interact")) {
1000                         delete a;
1001                         return;
1002                 }
1003         }
1004         /*
1005                 Handle restrictions and special cases of the craft action
1006         */
1007         else if (a->getType() == IACTION_CRAFT) {
1008                 ICraftAction *ca = (ICraftAction*)a;
1009
1010                 ca->craft_inv.applyCurrentPlayer(player->getName());
1011
1012                 setInventoryModified(ca->craft_inv, false);
1013
1014                 //bool craft_inv_is_current_player =
1015                 //      (ca->craft_inv.type == InventoryLocation::PLAYER) &&
1016                 //      (ca->craft_inv.name == player->getName());
1017
1018                 // Disallow crafting if not allowed to interact
1019                 if (!checkPriv(player->getName(), "interact")) {
1020                         infostream << "Cannot craft: "
1021                                         << "No interact privilege" << std::endl;
1022                         delete a;
1023                         return;
1024                 }
1025         }
1026
1027         // Do the action
1028         a->apply(this, playersao, this);
1029         // Eat the action
1030         delete a;
1031
1032         SendInventory(playersao);
1033 }
1034
1035 void Server::handleCommand_ChatMessage(NetworkPacket* pkt)
1036 {
1037         /*
1038                 u16 command
1039                 u16 length
1040                 wstring message
1041         */
1042         u16 len;
1043         *pkt >> len;
1044
1045         std::wstring message;
1046         for (u16 i = 0; i < len; i++) {
1047                 u16 tmp_wchar;
1048                 *pkt >> tmp_wchar;
1049
1050                 message += (wchar_t)tmp_wchar;
1051         }
1052
1053         Player *player = m_env->getPlayer(pkt->getPeerId());
1054         if (player == NULL) {
1055                 errorstream << "Server::ProcessData(): Canceling: "
1056                                 "No player for peer_id=" << pkt->getPeerId()
1057                                 << " disconnecting peer!" << std::endl;
1058                 m_con.DisconnectPeer(pkt->getPeerId());
1059                 return;
1060         }
1061
1062         // Get player name of this client
1063         std::string name = player->getName();
1064         std::wstring wname = narrow_to_wide(name);
1065
1066         std::wstring answer_to_sender = handleChat(name, wname, message,
1067                 true, pkt->getPeerId());
1068         if (!answer_to_sender.empty()) {
1069                 // Send the answer to sender
1070                 SendChatMessage(pkt->getPeerId(), answer_to_sender);
1071         }
1072 }
1073
1074 void Server::handleCommand_Damage(NetworkPacket* pkt)
1075 {
1076         u8 damage;
1077
1078         *pkt >> damage;
1079
1080         Player *player = m_env->getPlayer(pkt->getPeerId());
1081         if (player == NULL) {
1082                 errorstream << "Server::ProcessData(): Canceling: "
1083                                 "No player for peer_id=" << pkt->getPeerId()
1084                                 << " disconnecting peer!" << std::endl;
1085                 m_con.DisconnectPeer(pkt->getPeerId());
1086                 return;
1087         }
1088
1089         PlayerSAO *playersao = player->getPlayerSAO();
1090         if (playersao == NULL) {
1091                 errorstream << "Server::ProcessData(): Canceling: "
1092                                 "No player object for peer_id=" << pkt->getPeerId()
1093                                 << " disconnecting peer!" << std::endl;
1094                 m_con.DisconnectPeer(pkt->getPeerId());
1095                 return;
1096         }
1097
1098         if (g_settings->getBool("enable_damage")) {
1099                 actionstream << player->getName() << " damaged by "
1100                                 << (int)damage << " hp at " << PP(player->getPosition() / BS)
1101                                 << std::endl;
1102
1103                 playersao->setHP(playersao->getHP() - damage);
1104                 SendPlayerHPOrDie(playersao);
1105         }
1106 }
1107
1108 void Server::handleCommand_Breath(NetworkPacket* pkt)
1109 {
1110         u16 breath;
1111
1112         *pkt >> breath;
1113
1114         Player *player = m_env->getPlayer(pkt->getPeerId());
1115         if (player == NULL) {
1116                 errorstream << "Server::ProcessData(): Canceling: "
1117                                 "No player for peer_id=" << pkt->getPeerId()
1118                                 << " disconnecting peer!" << std::endl;
1119                 m_con.DisconnectPeer(pkt->getPeerId());
1120                 return;
1121         }
1122
1123         /*
1124          * If player is dead, we don't need to update the breath
1125          * He is dead !
1126          */
1127         if (player->isDead()) {
1128                 verbosestream << "TOSERVER_BREATH: " << player->getName()
1129                         << " is dead. Ignoring packet";
1130                 return;
1131         }
1132
1133
1134         PlayerSAO *playersao = player->getPlayerSAO();
1135         if (playersao == NULL) {
1136                 errorstream << "Server::ProcessData(): Canceling: "
1137                                 "No player object for peer_id=" << pkt->getPeerId()
1138                                 << " disconnecting peer!" << std::endl;
1139                 m_con.DisconnectPeer(pkt->getPeerId());
1140                 return;
1141         }
1142
1143         playersao->setBreath(breath);
1144         SendPlayerBreath(pkt->getPeerId());
1145 }
1146
1147 void Server::handleCommand_Password(NetworkPacket* pkt)
1148 {
1149         if (pkt->getSize() != PASSWORD_SIZE * 2)
1150                 return;
1151
1152         std::string oldpwd;
1153         std::string newpwd;
1154
1155         // Deny for clients using the new protocol
1156         RemoteClient* client = getClient(pkt->getPeerId(), CS_Created);
1157         if (client->net_proto_version >= 25) {
1158                 infostream << "Server::handleCommand_Password(): Denying change: "
1159                         << " Client protocol version for peer_id=" << pkt->getPeerId()
1160                         << " too new!" << std::endl;
1161                 return;
1162         }
1163
1164         for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
1165                 char c = pkt->getChar(i);
1166                 if (c == 0)
1167                         break;
1168                 oldpwd += c;
1169         }
1170
1171         for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
1172                 char c = pkt->getChar(PASSWORD_SIZE + i);
1173                 if (c == 0)
1174                         break;
1175                 newpwd += c;
1176         }
1177
1178         Player *player = m_env->getPlayer(pkt->getPeerId());
1179         if (player == NULL) {
1180                 errorstream << "Server::ProcessData(): Canceling: "
1181                                 "No player for peer_id=" << pkt->getPeerId()
1182                                 << " disconnecting peer!" << std::endl;
1183                 m_con.DisconnectPeer(pkt->getPeerId());
1184                 return;
1185         }
1186
1187         if (!base64_is_valid(newpwd)) {
1188                 infostream<<"Server: " << player->getName() <<
1189                                 " supplied invalid password hash" << std::endl;
1190                 // Wrong old password supplied!!
1191                 SendChatMessage(pkt->getPeerId(), L"Invalid new password hash supplied. Password NOT changed.");
1192                 return;
1193         }
1194
1195         infostream << "Server: Client requests a password change from "
1196                         << "'" << oldpwd << "' to '" << newpwd << "'" << std::endl;
1197
1198         std::string playername = player->getName();
1199
1200         std::string checkpwd;
1201         m_script->getAuth(playername, &checkpwd, NULL);
1202
1203         if (oldpwd != checkpwd) {
1204                 infostream << "Server: invalid old password" << std::endl;
1205                 // Wrong old password supplied!!
1206                 SendChatMessage(pkt->getPeerId(), L"Invalid old password supplied. Password NOT changed.");
1207                 return;
1208         }
1209
1210         bool success = m_script->setPassword(playername, newpwd);
1211         if (success) {
1212                 actionstream << player->getName() << " changes password" << std::endl;
1213                 SendChatMessage(pkt->getPeerId(), L"Password change successful.");
1214         } else {
1215                 actionstream << player->getName() << " tries to change password but "
1216                                 << "it fails" << std::endl;
1217                 SendChatMessage(pkt->getPeerId(), L"Password change failed or unavailable.");
1218         }
1219 }
1220
1221 void Server::handleCommand_PlayerItem(NetworkPacket* pkt)
1222 {
1223         if (pkt->getSize() < 2)
1224                 return;
1225
1226         Player *player = m_env->getPlayer(pkt->getPeerId());
1227         if (player == NULL) {
1228                 errorstream << "Server::ProcessData(): Canceling: "
1229                                 "No player for peer_id=" << pkt->getPeerId()
1230                                 << " disconnecting peer!" << std::endl;
1231                 m_con.DisconnectPeer(pkt->getPeerId());
1232                 return;
1233         }
1234
1235         PlayerSAO *playersao = player->getPlayerSAO();
1236         if (playersao == NULL) {
1237                 errorstream << "Server::ProcessData(): Canceling: "
1238                                 "No player object for peer_id=" << pkt->getPeerId()
1239                                 << " disconnecting peer!" << std::endl;
1240                 m_con.DisconnectPeer(pkt->getPeerId());
1241                 return;
1242         }
1243
1244         u16 item;
1245
1246         *pkt >> item;
1247
1248         playersao->setWieldIndex(item);
1249 }
1250
1251 void Server::handleCommand_Respawn(NetworkPacket* pkt)
1252 {
1253         Player *player = m_env->getPlayer(pkt->getPeerId());
1254         if (player == NULL) {
1255                 errorstream << "Server::ProcessData(): Canceling: "
1256                                 "No player for peer_id=" << pkt->getPeerId()
1257                                 << " disconnecting peer!" << std::endl;
1258                 m_con.DisconnectPeer(pkt->getPeerId());
1259                 return;
1260         }
1261
1262         if (!player->isDead())
1263                 return;
1264
1265         RespawnPlayer(pkt->getPeerId());
1266
1267         actionstream << player->getName() << " respawns at "
1268                         << PP(player->getPosition()/BS) << std::endl;
1269
1270         // ActiveObject is added to environment in AsyncRunStep after
1271         // the previous addition has been successfully removed
1272 }
1273
1274 void Server::handleCommand_Interact(NetworkPacket* pkt)
1275 {
1276         std::string datastring(pkt->getString(0), pkt->getSize());
1277         std::istringstream is(datastring, std::ios_base::binary);
1278
1279         /*
1280                 [0] u16 command
1281                 [2] u8 action
1282                 [3] u16 item
1283                 [5] u32 length of the next item
1284                 [9] serialized PointedThing
1285                 actions:
1286                 0: start digging (from undersurface) or use
1287                 1: stop digging (all parameters ignored)
1288                 2: digging completed
1289                 3: place block or item (to abovesurface)
1290                 4: use item
1291         */
1292         u8 action = readU8(is);
1293         u16 item_i = readU16(is);
1294         std::istringstream tmp_is(deSerializeLongString(is), std::ios::binary);
1295         PointedThing pointed;
1296         pointed.deSerialize(tmp_is);
1297
1298         verbosestream << "TOSERVER_INTERACT: action=" << (int)action << ", item="
1299                         << item_i << ", pointed=" << pointed.dump() << std::endl;
1300
1301         Player *player = m_env->getPlayer(pkt->getPeerId());
1302         if (player == NULL) {
1303                 errorstream << "Server::ProcessData(): Canceling: "
1304                                 "No player for peer_id=" << pkt->getPeerId()
1305                                 << " disconnecting peer!" << std::endl;
1306                 m_con.DisconnectPeer(pkt->getPeerId());
1307                 return;
1308         }
1309
1310         PlayerSAO *playersao = player->getPlayerSAO();
1311         if (playersao == NULL) {
1312                 errorstream << "Server::ProcessData(): Canceling: "
1313                                 "No player object for peer_id=" << pkt->getPeerId()
1314                                 << " disconnecting peer!" << std::endl;
1315                 m_con.DisconnectPeer(pkt->getPeerId());
1316                 return;
1317         }
1318
1319         if (player->isDead()) {
1320                 verbosestream << "TOSERVER_INTERACT: " << player->getName()
1321                         << " is dead. Ignoring packet";
1322                 return;
1323         }
1324
1325         v3f player_pos = playersao->getLastGoodPosition();
1326
1327         // Update wielded item
1328         playersao->setWieldIndex(item_i);
1329
1330         // Get pointed to node (undefined if not POINTEDTYPE_NODE)
1331         v3s16 p_under = pointed.node_undersurface;
1332         v3s16 p_above = pointed.node_abovesurface;
1333
1334         // Get pointed to object (NULL if not POINTEDTYPE_OBJECT)
1335         ServerActiveObject *pointed_object = NULL;
1336         if (pointed.type == POINTEDTHING_OBJECT) {
1337                 pointed_object = m_env->getActiveObject(pointed.object_id);
1338                 if (pointed_object == NULL) {
1339                         verbosestream << "TOSERVER_INTERACT: "
1340                                 "pointed object is NULL" << std::endl;
1341                         return;
1342                 }
1343
1344         }
1345
1346         v3f pointed_pos_under = player_pos;
1347         v3f pointed_pos_above = player_pos;
1348         if (pointed.type == POINTEDTHING_NODE) {
1349                 pointed_pos_under = intToFloat(p_under, BS);
1350                 pointed_pos_above = intToFloat(p_above, BS);
1351         }
1352         else if (pointed.type == POINTEDTHING_OBJECT) {
1353                 pointed_pos_under = pointed_object->getBasePosition();
1354                 pointed_pos_above = pointed_pos_under;
1355         }
1356
1357         /*
1358                 Check that target is reasonably close
1359                 (only when digging or placing things)
1360         */
1361         static const bool enable_anticheat = !g_settings->getBool("disable_anticheat");
1362         if ((action == 0 || action == 2 || action == 3) &&
1363                         (enable_anticheat && !isSingleplayer())) {
1364                 float d = player_pos.getDistanceFrom(pointed_pos_under);
1365                 float max_d = BS * 14; // Just some large enough value
1366                 if (d > max_d) {
1367                         actionstream << "Player " << player->getName()
1368                                         << " tried to access " << pointed.dump()
1369                                         << " from too far: "
1370                                         << "d=" << d <<", max_d=" << max_d
1371                                         << ". ignoring." << std::endl;
1372                         // Re-send block to revert change on client-side
1373                         RemoteClient *client = getClient(pkt->getPeerId());
1374                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1375                         client->SetBlockNotSent(blockpos);
1376                         // Call callbacks
1377                         m_script->on_cheat(playersao, "interacted_too_far");
1378                         // Do nothing else
1379                         return;
1380                 }
1381         }
1382
1383         /*
1384                 Make sure the player is allowed to do it
1385         */
1386         if (!checkPriv(player->getName(), "interact")) {
1387                 actionstream<<player->getName()<<" attempted to interact with "
1388                                 <<pointed.dump()<<" without 'interact' privilege"
1389                                 <<std::endl;
1390                 // Re-send block to revert change on client-side
1391                 RemoteClient *client = getClient(pkt->getPeerId());
1392                 // Digging completed -> under
1393                 if (action == 2) {
1394                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1395                         client->SetBlockNotSent(blockpos);
1396                 }
1397                 // Placement -> above
1398                 if (action == 3) {
1399                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
1400                         client->SetBlockNotSent(blockpos);
1401                 }
1402                 return;
1403         }
1404
1405         /*
1406                 If something goes wrong, this player is to blame
1407         */
1408         RollbackScopeActor rollback_scope(m_rollback,
1409                         std::string("player:")+player->getName());
1410
1411         /*
1412                 0: start digging or punch object
1413         */
1414         if (action == 0) {
1415                 if (pointed.type == POINTEDTHING_NODE) {
1416                         /*
1417                                 NOTE: This can be used in the future to check if
1418                                 somebody is cheating, by checking the timing.
1419                         */
1420
1421                         MapNode n(CONTENT_IGNORE);
1422                         bool pos_ok;
1423
1424                         n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1425                         if (!pos_ok) {
1426                                 infostream << "Server: Not punching: Node not found."
1427                                                 << " Adding block to emerge queue."
1428                                                 << std::endl;
1429                                 m_emerge->enqueueBlockEmerge(pkt->getPeerId(),
1430                                         getNodeBlockPos(p_above), false);
1431                         }
1432
1433                         if (n.getContent() != CONTENT_IGNORE)
1434                                 m_script->node_on_punch(p_under, n, playersao, pointed);
1435
1436                         // Cheat prevention
1437                         playersao->noCheatDigStart(p_under);
1438                 }
1439                 else if (pointed.type == POINTEDTHING_OBJECT) {
1440                         // Skip if object has been removed
1441                         if (pointed_object->m_removed)
1442                                 return;
1443
1444                         actionstream<<player->getName()<<" punches object "
1445                                         <<pointed.object_id<<": "
1446                                         <<pointed_object->getDescription()<<std::endl;
1447
1448                         ItemStack punchitem = playersao->getWieldedItem();
1449                         ToolCapabilities toolcap =
1450                                         punchitem.getToolCapabilities(m_itemdef);
1451                         v3f dir = (pointed_object->getBasePosition() -
1452                                         (player->getPosition() + player->getEyeOffset())
1453                                                 ).normalize();
1454                         float time_from_last_punch =
1455                                 playersao->resetTimeFromLastPunch();
1456
1457                         s16 src_original_hp = pointed_object->getHP();
1458                         s16 dst_origin_hp = playersao->getHP();
1459
1460                         pointed_object->punch(dir, &toolcap, playersao,
1461                                         time_from_last_punch);
1462
1463                         // If the object is a player and its HP changed
1464                         if (src_original_hp != pointed_object->getHP() &&
1465                                         pointed_object->getType() == ACTIVEOBJECT_TYPE_PLAYER) {
1466                                 SendPlayerHPOrDie((PlayerSAO *)pointed_object);
1467                         }
1468
1469                         // If the puncher is a player and its HP changed
1470                         if (dst_origin_hp != playersao->getHP())
1471                                 SendPlayerHPOrDie(playersao);
1472                 }
1473
1474         } // action == 0
1475
1476         /*
1477                 1: stop digging
1478         */
1479         else if (action == 1) {
1480         } // action == 1
1481
1482         /*
1483                 2: Digging completed
1484         */
1485         else if (action == 2) {
1486                 // Only digging of nodes
1487                 if (pointed.type == POINTEDTHING_NODE) {
1488                         bool pos_ok;
1489                         MapNode n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1490                         if (!pos_ok) {
1491                                 infostream << "Server: Not finishing digging: Node not found."
1492                                                 << " Adding block to emerge queue."
1493                                                 << std::endl;
1494                                 m_emerge->enqueueBlockEmerge(pkt->getPeerId(),
1495                                         getNodeBlockPos(p_above), false);
1496                         }
1497
1498                         /* Cheat prevention */
1499                         bool is_valid_dig = true;
1500                         if (enable_anticheat && !isSingleplayer()) {
1501                                 v3s16 nocheat_p = playersao->getNoCheatDigPos();
1502                                 float nocheat_t = playersao->getNoCheatDigTime();
1503                                 playersao->noCheatDigEnd();
1504                                 // If player didn't start digging this, ignore dig
1505                                 if (nocheat_p != p_under) {
1506                                         infostream << "Server: NoCheat: " << player->getName()
1507                                                         << " started digging "
1508                                                         << PP(nocheat_p) << " and completed digging "
1509                                                         << PP(p_under) << "; not digging." << std::endl;
1510                                         is_valid_dig = false;
1511                                         // Call callbacks
1512                                         m_script->on_cheat(playersao, "finished_unknown_dig");
1513                                 }
1514                                 // Get player's wielded item
1515                                 ItemStack playeritem;
1516                                 InventoryList *mlist = playersao->getInventory()->getList("main");
1517                                 if (mlist != NULL)
1518                                         playeritem = mlist->getItem(playersao->getWieldIndex());
1519                                 ToolCapabilities playeritem_toolcap =
1520                                                 playeritem.getToolCapabilities(m_itemdef);
1521                                 // Get diggability and expected digging time
1522                                 DigParams params = getDigParams(m_nodedef->get(n).groups,
1523                                                 &playeritem_toolcap);
1524                                 // If can't dig, try hand
1525                                 if (!params.diggable) {
1526                                         const ItemDefinition &hand = m_itemdef->get("");
1527                                         const ToolCapabilities *tp = hand.tool_capabilities;
1528                                         if (tp)
1529                                                 params = getDigParams(m_nodedef->get(n).groups, tp);
1530                                 }
1531                                 // If can't dig, ignore dig
1532                                 if (!params.diggable) {
1533                                         infostream << "Server: NoCheat: " << player->getName()
1534                                                         << " completed digging " << PP(p_under)
1535                                                         << ", which is not diggable with tool. not digging."
1536                                                         << std::endl;
1537                                         is_valid_dig = false;
1538                                         // Call callbacks
1539                                         m_script->on_cheat(playersao, "dug_unbreakable");
1540                                 }
1541                                 // Check digging time
1542                                 // If already invalidated, we don't have to
1543                                 if (!is_valid_dig) {
1544                                         // Well not our problem then
1545                                 }
1546                                 // Clean and long dig
1547                                 else if (params.time > 2.0 && nocheat_t * 1.2 > params.time) {
1548                                         // All is good, but grab time from pool; don't care if
1549                                         // it's actually available
1550                                         playersao->getDigPool().grab(params.time);
1551                                 }
1552                                 // Short or laggy dig
1553                                 // Try getting the time from pool
1554                                 else if (playersao->getDigPool().grab(params.time)) {
1555                                         // All is good
1556                                 }
1557                                 // Dig not possible
1558                                 else {
1559                                         infostream << "Server: NoCheat: " << player->getName()
1560                                                         << " completed digging " << PP(p_under)
1561                                                         << "too fast; not digging." << std::endl;
1562                                         is_valid_dig = false;
1563                                         // Call callbacks
1564                                         m_script->on_cheat(playersao, "dug_too_fast");
1565                                 }
1566                         }
1567
1568                         /* Actually dig node */
1569
1570                         if (is_valid_dig && n.getContent() != CONTENT_IGNORE)
1571                                 m_script->node_on_dig(p_under, n, playersao);
1572
1573                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1574                         RemoteClient *client = getClient(pkt->getPeerId());
1575                         // Send unusual result (that is, node not being removed)
1576                         if (m_env->getMap().getNodeNoEx(p_under).getContent() != CONTENT_AIR) {
1577                                 // Re-send block to revert change on client-side
1578                                 client->SetBlockNotSent(blockpos);
1579                         }
1580                         else {
1581                                 client->ResendBlockIfOnWire(blockpos);
1582                         }
1583                 }
1584         } // action == 2
1585
1586         /*
1587                 3: place block or right-click object
1588         */
1589         else if (action == 3) {
1590                 ItemStack item = playersao->getWieldedItem();
1591
1592                 // Reset build time counter
1593                 if (pointed.type == POINTEDTHING_NODE &&
1594                                 item.getDefinition(m_itemdef).type == ITEM_NODE)
1595                         getClient(pkt->getPeerId())->m_time_from_building = 0.0;
1596
1597                 if (pointed.type == POINTEDTHING_OBJECT) {
1598                         // Right click object
1599
1600                         // Skip if object has been removed
1601                         if (pointed_object->m_removed)
1602                                 return;
1603
1604                         actionstream << player->getName() << " right-clicks object "
1605                                         << pointed.object_id << ": "
1606                                         << pointed_object->getDescription() << std::endl;
1607
1608                         // Do stuff
1609                         pointed_object->rightClick(playersao);
1610                 }
1611                 else if (m_script->item_OnPlace(
1612                                 item, playersao, pointed)) {
1613                         // Placement was handled in lua
1614
1615                         // Apply returned ItemStack
1616                         if (playersao->setWieldedItem(item)) {
1617                                 SendInventory(playersao);
1618                         }
1619                 }
1620
1621                 // If item has node placement prediction, always send the
1622                 // blocks to make sure the client knows what exactly happened
1623                 RemoteClient *client = getClient(pkt->getPeerId());
1624                 v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
1625                 v3s16 blockpos2 = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1626                 if (item.getDefinition(m_itemdef).node_placement_prediction != "") {
1627                         client->SetBlockNotSent(blockpos);
1628                         if (blockpos2 != blockpos) {
1629                                 client->SetBlockNotSent(blockpos2);
1630                         }
1631                 }
1632                 else {
1633                         client->ResendBlockIfOnWire(blockpos);
1634                         if (blockpos2 != blockpos) {
1635                                 client->ResendBlockIfOnWire(blockpos2);
1636                         }
1637                 }
1638         } // action == 3
1639
1640         /*
1641                 4: use
1642         */
1643         else if (action == 4) {
1644                 ItemStack item = playersao->getWieldedItem();
1645
1646                 actionstream << player->getName() << " uses " << item.name
1647                                 << ", pointing at " << pointed.dump() << std::endl;
1648
1649                 if (m_script->item_OnUse(
1650                                 item, playersao, pointed)) {
1651                         // Apply returned ItemStack
1652                         if (playersao->setWieldedItem(item)) {
1653                                 SendInventory(playersao);
1654                         }
1655                 }
1656
1657         } // action == 4
1658
1659         /*
1660                 5: rightclick air
1661         */
1662         else if (action == 5) {
1663                 ItemStack item = playersao->getWieldedItem();
1664
1665                 actionstream << player->getName() << " activates "
1666                                 << item.name << std::endl;
1667
1668                 if (m_script->item_OnSecondaryUse(
1669                                 item, playersao)) {
1670                         if( playersao->setWieldedItem(item)) {
1671                                 SendInventory(playersao);
1672                         }
1673                 }
1674         }
1675
1676
1677         /*
1678                 Catch invalid actions
1679         */
1680         else {
1681                 warningstream << "Server: Invalid action "
1682                                 << action << std::endl;
1683         }
1684 }
1685
1686 void Server::handleCommand_RemovedSounds(NetworkPacket* pkt)
1687 {
1688         u16 num;
1689         *pkt >> num;
1690         for (u16 k = 0; k < num; k++) {
1691                 s32 id;
1692
1693                 *pkt >> id;
1694
1695                 std::map<s32, ServerPlayingSound>::iterator i =
1696                         m_playing_sounds.find(id);
1697
1698                 if (i == m_playing_sounds.end())
1699                         continue;
1700
1701                 ServerPlayingSound &psound = i->second;
1702                 psound.clients.erase(pkt->getPeerId());
1703                 if (psound.clients.empty())
1704                         m_playing_sounds.erase(i++);
1705         }
1706 }
1707
1708 void Server::handleCommand_NodeMetaFields(NetworkPacket* pkt)
1709 {
1710         v3s16 p;
1711         std::string formname;
1712         u16 num;
1713
1714         *pkt >> p >> formname >> num;
1715
1716         StringMap fields;
1717         for (u16 k = 0; k < num; k++) {
1718                 std::string fieldname;
1719                 *pkt >> fieldname;
1720                 fields[fieldname] = pkt->readLongString();
1721         }
1722
1723         Player *player = m_env->getPlayer(pkt->getPeerId());
1724         if (player == NULL) {
1725                 errorstream << "Server::ProcessData(): Canceling: "
1726                                 "No player for peer_id=" << pkt->getPeerId()
1727                                 << " disconnecting peer!" << std::endl;
1728                 m_con.DisconnectPeer(pkt->getPeerId());
1729                 return;
1730         }
1731
1732         PlayerSAO *playersao = player->getPlayerSAO();
1733         if (playersao == NULL) {
1734                 errorstream << "Server::ProcessData(): Canceling: "
1735                                 "No player object for peer_id=" << pkt->getPeerId()
1736                                 << " disconnecting peer!"  << std::endl;
1737                 m_con.DisconnectPeer(pkt->getPeerId());
1738                 return;
1739         }
1740
1741         // If something goes wrong, this player is to blame
1742         RollbackScopeActor rollback_scope(m_rollback,
1743                         std::string("player:")+player->getName());
1744
1745         // Check the target node for rollback data; leave others unnoticed
1746         RollbackNode rn_old(&m_env->getMap(), p, this);
1747
1748         m_script->node_on_receive_fields(p, formname, fields, playersao);
1749
1750         // Report rollback data
1751         RollbackNode rn_new(&m_env->getMap(), p, this);
1752         if (rollback() && rn_new != rn_old) {
1753                 RollbackAction action;
1754                 action.setSetNode(p, rn_old, rn_new);
1755                 rollback()->reportAction(action);
1756         }
1757 }
1758
1759 void Server::handleCommand_InventoryFields(NetworkPacket* pkt)
1760 {
1761         std::string formname;
1762         u16 num;
1763
1764         *pkt >> formname >> num;
1765
1766         StringMap fields;
1767         for (u16 k = 0; k < num; k++) {
1768                 std::string fieldname;
1769                 *pkt >> fieldname;
1770                 fields[fieldname] = pkt->readLongString();
1771         }
1772
1773         Player *player = m_env->getPlayer(pkt->getPeerId());
1774         if (player == NULL) {
1775                 errorstream << "Server::ProcessData(): Canceling: "
1776                                 "No player for peer_id=" << pkt->getPeerId()
1777                                 << " disconnecting peer!" << std::endl;
1778                 m_con.DisconnectPeer(pkt->getPeerId());
1779                 return;
1780         }
1781
1782         PlayerSAO *playersao = player->getPlayerSAO();
1783         if (playersao == NULL) {
1784                 errorstream << "Server::ProcessData(): Canceling: "
1785                                 "No player object for peer_id=" << pkt->getPeerId()
1786                                 << " disconnecting peer!" << std::endl;
1787                 m_con.DisconnectPeer(pkt->getPeerId());
1788                 return;
1789         }
1790
1791         m_script->on_playerReceiveFields(playersao, formname, fields);
1792 }
1793
1794 void Server::handleCommand_FirstSrp(NetworkPacket* pkt)
1795 {
1796         RemoteClient* client = getClient(pkt->getPeerId(), CS_Invalid);
1797         ClientState cstate = client->getState();
1798
1799         std::string playername = client->getName();
1800
1801         std::string salt;
1802         std::string verification_key;
1803
1804         std::string addr_s = getPeerAddress(pkt->getPeerId()).serializeString();
1805         u8 is_empty;
1806
1807         *pkt >> salt >> verification_key >> is_empty;
1808
1809         verbosestream << "Server: Got TOSERVER_FIRST_SRP from " << addr_s
1810                 << ", with is_empty= " << is_empty << std::endl;
1811
1812         // Either this packet is sent because the user is new or to change the password
1813         if (cstate == CS_HelloSent) {
1814                 if (!client->isMechAllowed(AUTH_MECHANISM_FIRST_SRP)) {
1815                         actionstream << "Server: Client from " << addr_s
1816                                         << " tried to set password without being "
1817                                         << "authenticated, or the username being new." << std::endl;
1818                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1819                         return;
1820                 }
1821
1822                 if (!isSingleplayer() &&
1823                                 g_settings->getBool("disallow_empty_password") &&
1824                                 is_empty == 1) {
1825                         actionstream << "Server: " << playername
1826                                         << " supplied empty password from " << addr_s << std::endl;
1827                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_EMPTY_PASSWORD);
1828                         return;
1829                 }
1830
1831                 std::string initial_ver_key;
1832
1833                 initial_ver_key = encodeSRPVerifier(verification_key, salt);
1834                 m_script->createAuth(playername, initial_ver_key);
1835
1836                 acceptAuth(pkt->getPeerId(), false);
1837         } else {
1838                 if (cstate < CS_SudoMode) {
1839                         infostream << "Server::ProcessData(): Ignoring TOSERVER_FIRST_SRP from "
1840                                         << addr_s << ": " << "Client has wrong state " << cstate << "."
1841                                         << std::endl;
1842                         return;
1843                 }
1844                 m_clients.event(pkt->getPeerId(), CSE_SudoLeave);
1845                 std::string pw_db_field = encodeSRPVerifier(verification_key, salt);
1846                 bool success = m_script->setPassword(playername, pw_db_field);
1847                 if (success) {
1848                         actionstream << playername << " changes password" << std::endl;
1849                         SendChatMessage(pkt->getPeerId(), L"Password change successful.");
1850                 } else {
1851                         actionstream << playername << " tries to change password but "
1852                                 << "it fails" << std::endl;
1853                         SendChatMessage(pkt->getPeerId(), L"Password change failed or unavailable.");
1854                 }
1855         }
1856 }
1857
1858 void Server::handleCommand_SrpBytesA(NetworkPacket* pkt)
1859 {
1860         RemoteClient* client = getClient(pkt->getPeerId(), CS_Invalid);
1861         ClientState cstate = client->getState();
1862
1863         bool wantSudo = (cstate == CS_Active);
1864
1865         if (!((cstate == CS_HelloSent) || (cstate == CS_Active))) {
1866                 actionstream << "Server: got SRP _A packet in wrong state "
1867                         << cstate << " from "
1868                         << getPeerAddress(pkt->getPeerId()).serializeString()
1869                         << ". Ignoring." << std::endl;
1870                 return;
1871         }
1872
1873         if (client->chosen_mech != AUTH_MECHANISM_NONE) {
1874                 actionstream << "Server: got SRP _A packet, while auth"
1875                         << "is already going on with mech " << client->chosen_mech
1876                         << " from " << getPeerAddress(pkt->getPeerId()).serializeString()
1877                         << " (wantSudo=" << wantSudo << "). Ignoring." << std::endl;
1878                 if (wantSudo) {
1879                         DenySudoAccess(pkt->getPeerId());
1880                         return;
1881                 } else {
1882                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1883                         return;
1884                 }
1885         }
1886
1887         std::string bytes_A;
1888         u8 based_on;
1889         *pkt >> bytes_A >> based_on;
1890
1891         infostream << "Server: TOSERVER_SRP_BYTES_A received with "
1892                 << "based_on=" << int(based_on) << " and len_A="
1893                 << bytes_A.length() << "." << std::endl;
1894
1895         AuthMechanism chosen = (based_on == 0) ?
1896                 AUTH_MECHANISM_LEGACY_PASSWORD : AUTH_MECHANISM_SRP;
1897
1898         if (wantSudo) {
1899                 if (!client->isSudoMechAllowed(chosen)) {
1900                         actionstream << "Server: Player \"" << client->getName()
1901                                 << "\" at " << getPeerAddress(pkt->getPeerId()).serializeString()
1902                                 << " tried to change password using unallowed mech "
1903                                 << chosen << "." << std::endl;
1904                         DenySudoAccess(pkt->getPeerId());
1905                         return;
1906                 }
1907         } else {
1908                 if (!client->isMechAllowed(chosen)) {
1909                         actionstream << "Server: Client tried to authenticate from "
1910                                 << getPeerAddress(pkt->getPeerId()).serializeString()
1911                                 << " using unallowed mech " << chosen << "." << std::endl;
1912                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1913                         return;
1914                 }
1915         }
1916
1917         client->chosen_mech = chosen;
1918
1919         std::string bytes_s;
1920         std::string bytes_v;
1921
1922         if (based_on == 0) {
1923                 char *p_bytes_s = 0;
1924                 size_t len_s = 0;
1925                 char *p_bytes_v = 0;
1926                 size_t len_v = 0;
1927                 getSRPVerifier(client->getName(), client->enc_pwd,
1928                         &p_bytes_s, &len_s,
1929                         &p_bytes_v, &len_v);
1930                 bytes_s = std::string(p_bytes_s, len_s);
1931                 bytes_v = std::string(p_bytes_v, len_v);
1932                 free(p_bytes_s);
1933                 free(p_bytes_v);
1934         } else if (!decodeSRPVerifier(client->enc_pwd, &bytes_s, &bytes_v)) {
1935                 // Non-base64 errors should have been catched in the init handler
1936                 actionstream << "Server: User " << client->getName()
1937                         << " tried to log in, but srp verifier field"
1938                         << " was invalid (most likely invalid base64)." << std::endl;
1939                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
1940                 return;
1941         }
1942
1943         char *bytes_B = 0;
1944         size_t len_B = 0;
1945
1946         client->auth_data = srp_verifier_new(SRP_SHA256, SRP_NG_2048,
1947                 client->getName().c_str(),
1948                 (const unsigned char *) bytes_s.c_str(), bytes_s.size(),
1949                 (const unsigned char *) bytes_v.c_str(), bytes_v.size(),
1950                 (const unsigned char *) bytes_A.c_str(), bytes_A.size(),
1951                 NULL, 0,
1952                 (unsigned char **) &bytes_B, &len_B, NULL, NULL);
1953
1954         if (!bytes_B) {
1955                 actionstream << "Server: User " << client->getName()
1956                         << " tried to log in, SRP-6a safety check violated in _A handler."
1957                         << std::endl;
1958                 if (wantSudo) {
1959                         DenySudoAccess(pkt->getPeerId());
1960                         return;
1961                 } else {
1962                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1963                         return;
1964                 }
1965         }
1966
1967         NetworkPacket resp_pkt(TOCLIENT_SRP_BYTES_S_B, 0, pkt->getPeerId());
1968         resp_pkt << bytes_s << std::string(bytes_B, len_B);
1969         Send(&resp_pkt);
1970 }
1971
1972 void Server::handleCommand_SrpBytesM(NetworkPacket* pkt)
1973 {
1974         RemoteClient* client = getClient(pkt->getPeerId(), CS_Invalid);
1975         ClientState cstate = client->getState();
1976
1977         bool wantSudo = (cstate == CS_Active);
1978
1979         verbosestream << "Server: Recieved TOCLIENT_SRP_BYTES_M." << std::endl;
1980
1981         if (!((cstate == CS_HelloSent) || (cstate == CS_Active))) {
1982                 actionstream << "Server: got SRP _M packet in wrong state "
1983                         << cstate << " from "
1984                         << getPeerAddress(pkt->getPeerId()).serializeString()
1985                         << ". Ignoring." << std::endl;
1986                 return;
1987         }
1988
1989         if ((client->chosen_mech != AUTH_MECHANISM_SRP)
1990                 && (client->chosen_mech != AUTH_MECHANISM_LEGACY_PASSWORD)) {
1991                 actionstream << "Server: got SRP _M packet, while auth"
1992                         << "is going on with mech " << client->chosen_mech
1993                         << " from " << getPeerAddress(pkt->getPeerId()).serializeString()
1994                         << " (wantSudo=" << wantSudo << "). Denying." << std::endl;
1995                 if (wantSudo) {
1996                         DenySudoAccess(pkt->getPeerId());
1997                         return;
1998                 } else {
1999                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
2000                         return;
2001                 }
2002         }
2003
2004         std::string bytes_M;
2005         *pkt >> bytes_M;
2006
2007         if (srp_verifier_get_session_key_length((SRPVerifier *) client->auth_data)
2008                         != bytes_M.size()) {
2009                 actionstream << "Server: User " << client->getName()
2010                         << " at " << getPeerAddress(pkt->getPeerId()).serializeString()
2011                         << " sent bytes_M with invalid length " << bytes_M.size() << std::endl;
2012                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
2013                 return;
2014         }
2015
2016         unsigned char *bytes_HAMK = 0;
2017
2018         srp_verifier_verify_session((SRPVerifier *) client->auth_data,
2019                 (unsigned char *)bytes_M.c_str(), &bytes_HAMK);
2020
2021         if (!bytes_HAMK) {
2022                 if (wantSudo) {
2023                         actionstream << "Server: User " << client->getName()
2024                                 << " at " << getPeerAddress(pkt->getPeerId()).serializeString()
2025                                 << " tried to change their password, but supplied wrong"
2026                                 << " (SRP) password for authentication." << std::endl;
2027                         DenySudoAccess(pkt->getPeerId());
2028                         return;
2029                 } else {
2030                         actionstream << "Server: User " << client->getName()
2031                                 << " at " << getPeerAddress(pkt->getPeerId()).serializeString()
2032                                 << " supplied wrong password (auth mechanism: SRP)."
2033                                 << std::endl;
2034                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_PASSWORD);
2035                         return;
2036                 }
2037         }
2038
2039         if (client->create_player_on_auth_success) {
2040                 std::string playername = client->getName();
2041                 m_script->createAuth(playername, client->enc_pwd);
2042
2043                 std::string checkpwd; // not used, but needed for passing something
2044                 if (!m_script->getAuth(playername, &checkpwd, NULL)) {
2045                         actionstream << "Server: " << playername << " cannot be authenticated"
2046                                 << " (auth handler does not work?)" << std::endl;
2047                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
2048                         return;
2049                 }
2050                 client->create_player_on_auth_success = false;
2051         }
2052
2053         acceptAuth(pkt->getPeerId(), wantSudo);
2054 }