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: " << playername << " supplied wrong password"
 572                                 << std::endl;
 573                 DenyAccess_Legacy(pkt->getPeerId(), L"Wrong password");
 574                 return;
 575         }
 576
 577         RemotePlayer *player =
 578                         static_cast<RemotePlayer*>(m_env->getPlayer(playername));
 579
 580         if (player && player->peer_id != 0) {
 581                 actionstream << "Server: " << playername << ": Failed to emerge player"
 582                                 << " (player allocated to an another client)" << std::endl;
 583                 DenyAccess_Legacy(pkt->getPeerId(), L"Another client is connected with this "
 584                                 L"name. If your client closed unexpectedly, try again in "
 585                                 L"a minute.");
 586         }
 587
 588         m_clients.setPlayerName(pkt->getPeerId(), playername);
 589
 590         /*
 591                 Answer with a TOCLIENT_INIT
 592         */
 593
 594         NetworkPacket resp_pkt(TOCLIENT_INIT_LEGACY, 1 + 6 + 8 + 4,
 595                         pkt->getPeerId());
 596
 597         resp_pkt << (u8) deployed << (v3s16) floatToInt(v3f(0,0,0), BS)
 598                         << (u64) m_env->getServerMap().getSeed()
 599                         << g_settings->getFloat("dedicated_server_step");
 600
 601         Send(&resp_pkt);
 602         m_clients.event(pkt->getPeerId(), CSE_InitLegacy);
 603 }
 604
 605 void Server::handleCommand_Init2(NetworkPacket* pkt)
 606 {
 607         verbosestream << "Server: Got TOSERVER_INIT2 from "
 608                         << pkt->getPeerId() << std::endl;
 609
 610         m_clients.event(pkt->getPeerId(), CSE_GotInit2);
 611         u16 protocol_version = m_clients.getProtocolVersion(pkt->getPeerId());
 612
 613
 614         ///// begin compatibility code
 615         PlayerSAO* playersao = NULL;
 616         if (protocol_version <= 22) {
 617                 playersao = StageTwoClientInit(pkt->getPeerId());
 618
 619                 if (playersao == NULL) {
 620                         actionstream
 621                                 << "TOSERVER_INIT2 stage 2 client init failed for peer "
 622                                 << pkt->getPeerId() << std::endl;
 623                         return;
 624                 }
 625         }
 626         ///// end compatibility code
 627
 628         /*
 629                 Send some initialization data
 630         */
 631
 632         infostream << "Server: Sending content to "
 633                         << getPlayerName(pkt->getPeerId()) << std::endl;
 634
 635         // Send player movement settings
 636         SendMovement(pkt->getPeerId());
 637
 638         // Send item definitions
 639         SendItemDef(pkt->getPeerId(), m_itemdef, protocol_version);
 640
 641         // Send node definitions
 642         SendNodeDef(pkt->getPeerId(), m_nodedef, protocol_version);
 643
 644         m_clients.event(pkt->getPeerId(), CSE_SetDefinitionsSent);
 645
 646         // Send media announcement
 647         sendMediaAnnouncement(pkt->getPeerId());
 648
 649         // Send detached inventories
 650         sendDetachedInventories(pkt->getPeerId());
 651
 652         // Send time of day
 653         u16 time = m_env->getTimeOfDay();
 654         float time_speed = g_settings->getFloat("time_speed");
 655         SendTimeOfDay(pkt->getPeerId(), time, time_speed);
 656
 657         ///// begin compatibility code
 658         if (protocol_version <= 22) {
 659                 m_clients.event(pkt->getPeerId(), CSE_SetClientReady);
 660                 m_script->on_joinplayer(playersao);
 661         }
 662         ///// end compatibility code
 663
 664         // Warnings about protocol version can be issued here
 665         if (getClient(pkt->getPeerId())->net_proto_version < LATEST_PROTOCOL_VERSION) {
 666                 SendChatMessage(pkt->getPeerId(), L"# Server: WARNING: YOUR CLIENT'S "
 667                                 L"VERSION MAY NOT BE FULLY COMPATIBLE WITH THIS SERVER!");
 668         }
 669 }
 670
 671 void Server::handleCommand_RequestMedia(NetworkPacket* pkt)
 672 {
 673         std::vector<std::string> tosend;
 674         u16 numfiles;
 675
 676         *pkt >> numfiles;
 677
 678         infostream << "Sending " << numfiles << " files to "
 679                         << getPlayerName(pkt->getPeerId()) << std::endl;
 680         verbosestream << "TOSERVER_REQUEST_MEDIA: " << std::endl;
 681
 682         for (u16 i = 0; i < numfiles; i++) {
 683                 std::string name;
 684
 685                 *pkt >> name;
 686
 687                 tosend.push_back(name);
 688                 verbosestream << "TOSERVER_REQUEST_MEDIA: requested file "
 689                                 << name << std::endl;
 690         }
 691
 692         sendRequestedMedia(pkt->getPeerId(), tosend);
 693 }
 694
 695 void Server::handleCommand_ReceivedMedia(NetworkPacket* pkt)
 696 {
 697 }
 698
 699 void Server::handleCommand_ClientReady(NetworkPacket* pkt)
 700 {
 701         u16 peer_id = pkt->getPeerId();
 702         u16 peer_proto_ver = getClient(peer_id, CS_InitDone)->net_proto_version;
 703
 704         // clients <= protocol version 22 did not send ready message,
 705         // they're already initialized
 706         if (peer_proto_ver <= 22) {
 707                 infostream << "Client sent message not expected by a "
 708                         << "client using protocol version <= 22,"
 709                         << "disconnecting peer_id: " << peer_id << std::endl;
 710                 m_con.DisconnectPeer(peer_id);
 711                 return;
 712         }
 713
 714         PlayerSAO* playersao = StageTwoClientInit(peer_id);
 715
 716         if (playersao == NULL) {
 717                 actionstream
 718                         << "TOSERVER_CLIENT_READY stage 2 client init failed for peer_id: "
 719                         << peer_id << std::endl;
 720                 m_con.DisconnectPeer(peer_id);
 721                 return;
 722         }
 723
 724
 725         if (pkt->getSize() < 8) {
 726                 errorstream
 727                         << "TOSERVER_CLIENT_READY client sent inconsistent data, disconnecting peer_id: "
 728                         << peer_id << std::endl;
 729                 m_con.DisconnectPeer(peer_id);
 730                 return;
 731         }
 732
 733         u8 major_ver, minor_ver, patch_ver, reserved;
 734         std::string full_ver;
 735         *pkt >> major_ver >> minor_ver >> patch_ver >> reserved >> full_ver;
 736
 737         m_clients.setClientVersion(
 738                         peer_id, major_ver, minor_ver, patch_ver,
 739                         full_ver);
 740
 741         m_clients.event(peer_id, CSE_SetClientReady);
 742         m_script->on_joinplayer(playersao);
 743 }
 744
 745 void Server::handleCommand_GotBlocks(NetworkPacket* pkt)
 746 {
 747         if (pkt->getSize() < 1)
 748                 return;
 749
 750         /*
 751                 [0] u16 command
 752                 [2] u8 count
 753                 [3] v3s16 pos_0
 754                 [3+6] v3s16 pos_1
 755                 ...
 756         */
 757
 758         u8 count;
 759         *pkt >> count;
 760
 761         RemoteClient *client = getClient(pkt->getPeerId());
 762
 763         for (u16 i = 0; i < count; i++) {
 764                 if ((s16)pkt->getSize() < 1 + (i + 1) * 6)
 765                         throw con::InvalidIncomingDataException
 766                                 ("GOTBLOCKS length is too short");
 767                 v3s16 p;
 768
 769                 *pkt >> p;
 770
 771                 client->GotBlock(p);
 772         }
 773 }
 774
 775 void Server::handleCommand_PlayerPos(NetworkPacket* pkt)
 776 {
 777         if (pkt->getSize() < 12 + 12 + 4 + 4)
 778                 return;
 779
 780         v3s32 ps, ss;
 781         s32 f32pitch, f32yaw;
 782
 783         *pkt >> ps;
 784         *pkt >> ss;
 785         *pkt >> f32pitch;
 786         *pkt >> f32yaw;
 787
 788         f32 pitch = (f32)f32pitch / 100.0;
 789         f32 yaw = (f32)f32yaw / 100.0;
 790         u32 keyPressed = 0;
 791
 792         if (pkt->getSize() >= 12 + 12 + 4 + 4 + 4)
 793                 *pkt >> keyPressed;
 794
 795         v3f position((f32)ps.X / 100.0, (f32)ps.Y / 100.0, (f32)ps.Z / 100.0);
 796         v3f speed((f32)ss.X / 100.0, (f32)ss.Y / 100.0, (f32)ss.Z / 100.0);
 797
 798         pitch = modulo360f(pitch);
 799         yaw = modulo360f(yaw);
 800
 801         Player *player = m_env->getPlayer(pkt->getPeerId());
 802         if (player == NULL) {
 803                 errorstream << "Server::ProcessData(): Canceling: "
 804                                 "No player for peer_id=" << pkt->getPeerId()
 805                                 << " disconnecting peer!" << std::endl;
 806                 m_con.DisconnectPeer(pkt->getPeerId());
 807                 return;
 808         }
 809
 810         // If player is dead we don't care of this packet
 811         if (player->isDead()) {
 812                 verbosestream << "TOSERVER_PLAYERPOS: " << player->getName()
 813                         << " is dead. Ignoring packet";
 814                 return;
 815         }
 816
 817         PlayerSAO *playersao = player->getPlayerSAO();
 818         if (playersao == NULL) {
 819                 errorstream << "Server::ProcessData(): Canceling: "
 820                                 "No player object for peer_id=" << pkt->getPeerId()
 821                                 << " disconnecting peer!" << std::endl;
 822                 m_con.DisconnectPeer(pkt->getPeerId());
 823                 return;
 824         }
 825
 826         player->setPosition(position);
 827         player->setSpeed(speed);
 828         player->setPitch(pitch);
 829         player->setYaw(yaw);
 830         player->keyPressed = keyPressed;
 831         player->control.up = (keyPressed & 1);
 832         player->control.down = (keyPressed & 2);
 833         player->control.left = (keyPressed & 4);
 834         player->control.right = (keyPressed & 8);
 835         player->control.jump = (keyPressed & 16);
 836         player->control.aux1 = (keyPressed & 32);
 837         player->control.sneak = (keyPressed & 64);
 838         player->control.LMB = (keyPressed & 128);
 839         player->control.RMB = (keyPressed & 256);
 840
 841         if (playersao->checkMovementCheat()) {
 842                 // Call callbacks
 843                 m_script->on_cheat(playersao, "moved_too_fast");
 844                 SendMovePlayer(pkt->getPeerId());
 845         }
 846 }
 847
 848 void Server::handleCommand_DeletedBlocks(NetworkPacket* pkt)
 849 {
 850         if (pkt->getSize() < 1)
 851                 return;
 852
 853         /*
 854                 [0] u16 command
 855                 [2] u8 count
 856                 [3] v3s16 pos_0
 857                 [3+6] v3s16 pos_1
 858                 ...
 859         */
 860
 861         u8 count;
 862         *pkt >> count;
 863
 864         RemoteClient *client = getClient(pkt->getPeerId());
 865
 866         for (u16 i = 0; i < count; i++) {
 867                 if ((s16)pkt->getSize() < 1 + (i + 1) * 6)
 868                         throw con::InvalidIncomingDataException
 869                                 ("DELETEDBLOCKS length is too short");
 870                 v3s16 p;
 871                 *pkt >> p;
 872
 873                 client->SetBlockNotSent(p);
 874         }
 875 }
 876
 877 void Server::handleCommand_InventoryAction(NetworkPacket* pkt)
 878 {
 879         Player *player = m_env->getPlayer(pkt->getPeerId());
 880         if (player == NULL) {
 881                 errorstream << "Server::ProcessData(): Canceling: "
 882                                 "No player for peer_id=" << pkt->getPeerId()
 883                                 << " disconnecting peer!" << std::endl;
 884                 m_con.DisconnectPeer(pkt->getPeerId());
 885                 return;
 886         }
 887
 888         PlayerSAO *playersao = player->getPlayerSAO();
 889         if (playersao == NULL) {
 890                 errorstream << "Server::ProcessData(): Canceling: "
 891                                 "No player object for peer_id=" << pkt->getPeerId()
 892                                 << " disconnecting peer!" << std::endl;
 893                 m_con.DisconnectPeer(pkt->getPeerId());
 894                 return;
 895         }
 896
 897         // Strip command and create a stream
 898         std::string datastring(pkt->getString(0), pkt->getSize());
 899         verbosestream << "TOSERVER_INVENTORY_ACTION: data=" << datastring
 900                 << std::endl;
 901         std::istringstream is(datastring, std::ios_base::binary);
 902         // Create an action
 903         InventoryAction *a = InventoryAction::deSerialize(is);
 904         if (a == NULL) {
 905                 infostream << "TOSERVER_INVENTORY_ACTION: "
 906                                 << "InventoryAction::deSerialize() returned NULL"
 907                                 << std::endl;
 908                 return;
 909         }
 910
 911         // If something goes wrong, this player is to blame
 912         RollbackScopeActor rollback_scope(m_rollback,
 913                         std::string("player:")+player->getName());
 914
 915         /*
 916                 Note: Always set inventory not sent, to repair cases
 917                 where the client made a bad prediction.
 918         */
 919
 920         /*
 921                 Handle restrictions and special cases of the move action
 922         */
 923         if (a->getType() == IACTION_MOVE) {
 924                 IMoveAction *ma = (IMoveAction*)a;
 925
 926                 ma->from_inv.applyCurrentPlayer(player->getName());
 927                 ma->to_inv.applyCurrentPlayer(player->getName());
 928
 929                 setInventoryModified(ma->from_inv, false);
 930                 setInventoryModified(ma->to_inv, false);
 931
 932                 bool from_inv_is_current_player =
 933                         (ma->from_inv.type == InventoryLocation::PLAYER) &&
 934                         (ma->from_inv.name == player->getName());
 935
 936                 bool to_inv_is_current_player =
 937                         (ma->to_inv.type == InventoryLocation::PLAYER) &&
 938                         (ma->to_inv.name == player->getName());
 939
 940                 /*
 941                         Disable moving items out of craftpreview
 942                 */
 943                 if (ma->from_list == "craftpreview") {
 944                         infostream << "Ignoring IMoveAction from "
 945                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 946                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 947                                         << " because src is " << ma->from_list << std::endl;
 948                         delete a;
 949                         return;
 950                 }
 951
 952                 /*
 953                         Disable moving items into craftresult and craftpreview
 954                 */
 955                 if (ma->to_list == "craftpreview" || ma->to_list == "craftresult") {
 956                         infostream << "Ignoring IMoveAction from "
 957                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 958                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 959                                         << " because dst is " << ma->to_list << std::endl;
 960                         delete a;
 961                         return;
 962                 }
 963
 964                 // Disallow moving items in elsewhere than player's inventory
 965                 // if not allowed to interact
 966                 if (!checkPriv(player->getName(), "interact") &&
 967                                 (!from_inv_is_current_player ||
 968                                 !to_inv_is_current_player)) {
 969                         infostream << "Cannot move outside of player's inventory: "
 970                                         << "No interact privilege" << std::endl;
 971                         delete a;
 972                         return;
 973                 }
 974         }
 975         /*
 976                 Handle restrictions and special cases of the drop action
 977         */
 978         else if (a->getType() == IACTION_DROP) {
 979                 IDropAction *da = (IDropAction*)a;
 980
 981                 da->from_inv.applyCurrentPlayer(player->getName());
 982
 983                 setInventoryModified(da->from_inv, false);
 984
 985                 /*
 986                         Disable dropping items out of craftpreview
 987                 */
 988                 if (da->from_list == "craftpreview") {
 989                         infostream << "Ignoring IDropAction from "
 990                                         << (da->from_inv.dump()) << ":" << da->from_list
 991                                         << " because src is " << da->from_list << std::endl;
 992                         delete a;
 993                         return;
 994                 }
 995
 996                 // Disallow dropping items if not allowed to interact
 997                 if (!checkPriv(player->getName(), "interact")) {
 998                         delete a;
 999                         return;
1000                 }
1001         }
1002         /*
1003                 Handle restrictions and special cases of the craft action
1004         */
1005         else if (a->getType() == IACTION_CRAFT) {
1006                 ICraftAction *ca = (ICraftAction*)a;
1007
1008                 ca->craft_inv.applyCurrentPlayer(player->getName());
1009
1010                 setInventoryModified(ca->craft_inv, false);
1011
1012                 //bool craft_inv_is_current_player =
1013                 //      (ca->craft_inv.type == InventoryLocation::PLAYER) &&
1014                 //      (ca->craft_inv.name == player->getName());
1015
1016                 // Disallow crafting if not allowed to interact
1017                 if (!checkPriv(player->getName(), "interact")) {
1018                         infostream << "Cannot craft: "
1019                                         << "No interact privilege" << std::endl;
1020                         delete a;
1021                         return;
1022                 }
1023         }
1024
1025         // Do the action
1026         a->apply(this, playersao, this);
1027         // Eat the action
1028         delete a;
1029
1030         SendInventory(playersao);
1031 }
1032
1033 void Server::handleCommand_ChatMessage(NetworkPacket* pkt)
1034 {
1035         /*
1036                 u16 command
1037                 u16 length
1038                 wstring message
1039         */
1040         u16 len;
1041         *pkt >> len;
1042
1043         std::wstring message;
1044         for (u16 i = 0; i < len; i++) {
1045                 u16 tmp_wchar;
1046                 *pkt >> tmp_wchar;
1047
1048                 message += (wchar_t)tmp_wchar;
1049         }
1050
1051         Player *player = m_env->getPlayer(pkt->getPeerId());
1052         if (player == NULL) {
1053                 errorstream << "Server::ProcessData(): Canceling: "
1054                                 "No player for peer_id=" << pkt->getPeerId()
1055                                 << " disconnecting peer!" << std::endl;
1056                 m_con.DisconnectPeer(pkt->getPeerId());
1057                 return;
1058         }
1059
1060         // If something goes wrong, this player is to blame
1061         RollbackScopeActor rollback_scope(m_rollback,
1062                         std::string("player:")+player->getName());
1063
1064         // Get player name of this client
1065         std::wstring name = narrow_to_wide(player->getName());
1066
1067         // Run script hook
1068         bool ate = m_script->on_chat_message(player->getName(),
1069                         wide_to_narrow(message));
1070         // If script ate the message, don't proceed
1071         if (ate)
1072                 return;
1073
1074         // Line to send to players
1075         std::wstring line;
1076         // Whether to send to the player that sent the line
1077         bool send_to_sender_only = false;
1078
1079         // Commands are implemented in Lua, so only catch invalid
1080         // commands that were not "eaten" and send an error back
1081         if (message[0] == L'/') {
1082                 message = message.substr(1);
1083                 send_to_sender_only = true;
1084                 if (message.length() == 0)
1085                         line += L"-!- Empty command";
1086                 else
1087                         line += L"-!- Invalid command: " + str_split(message, L' ')[0];
1088         }
1089         else {
1090                 if (checkPriv(player->getName(), "shout")) {
1091                         line += L"<";
1092                         line += name;
1093                         line += L"> ";
1094                         line += message;
1095                 } else {
1096                         line += L"-!- You don't have permission to shout.";
1097                         send_to_sender_only = true;
1098                 }
1099         }
1100
1101         if (line != L"")
1102         {
1103                 /*
1104                         Send the message to sender
1105                 */
1106                 if (send_to_sender_only) {
1107                         SendChatMessage(pkt->getPeerId(), line);
1108                 }
1109                 /*
1110                         Send the message to others
1111                 */
1112                 else {
1113                         actionstream << "CHAT: " << wide_to_narrow(line)<<std::endl;
1114
1115                         std::vector<u16> clients = m_clients.getClientIDs();
1116
1117                         for (std::vector<u16>::iterator i = clients.begin();
1118                                 i != clients.end(); ++i) {
1119                                 if (*i != pkt->getPeerId())
1120                                         SendChatMessage(*i, line);
1121                         }
1122                 }
1123         }
1124 }
1125
1126 void Server::handleCommand_Damage(NetworkPacket* pkt)
1127 {
1128         u8 damage;
1129
1130         *pkt >> damage;
1131
1132         Player *player = m_env->getPlayer(pkt->getPeerId());
1133         if (player == NULL) {
1134                 errorstream << "Server::ProcessData(): Canceling: "
1135                                 "No player for peer_id=" << pkt->getPeerId()
1136                                 << " disconnecting peer!" << std::endl;
1137                 m_con.DisconnectPeer(pkt->getPeerId());
1138                 return;
1139         }
1140
1141         PlayerSAO *playersao = player->getPlayerSAO();
1142         if (playersao == NULL) {
1143                 errorstream << "Server::ProcessData(): Canceling: "
1144                                 "No player object for peer_id=" << pkt->getPeerId()
1145                                 << " disconnecting peer!" << std::endl;
1146                 m_con.DisconnectPeer(pkt->getPeerId());
1147                 return;
1148         }
1149
1150         if (g_settings->getBool("enable_damage")) {
1151                 actionstream << player->getName() << " damaged by "
1152                                 << (int)damage << " hp at " << PP(player->getPosition() / BS)
1153                                 << std::endl;
1154
1155                 playersao->setHP(playersao->getHP() - damage);
1156                 SendPlayerHPOrDie(playersao);
1157         }
1158 }
1159
1160 void Server::handleCommand_Breath(NetworkPacket* pkt)
1161 {
1162         u16 breath;
1163
1164         *pkt >> breath;
1165
1166         Player *player = m_env->getPlayer(pkt->getPeerId());
1167         if (player == NULL) {
1168                 errorstream << "Server::ProcessData(): Canceling: "
1169                                 "No player for peer_id=" << pkt->getPeerId()
1170                                 << " disconnecting peer!" << std::endl;
1171                 m_con.DisconnectPeer(pkt->getPeerId());
1172                 return;
1173         }
1174
1175         /*
1176          * If player is dead, we don't need to update the breath
1177          * He is dead !
1178          */
1179         if (player->isDead()) {
1180                 verbosestream << "TOSERVER_BREATH: " << player->getName()
1181                         << " is dead. Ignoring packet";
1182                 return;
1183         }
1184
1185
1186         PlayerSAO *playersao = player->getPlayerSAO();
1187         if (playersao == NULL) {
1188                 errorstream << "Server::ProcessData(): Canceling: "
1189                                 "No player object for peer_id=" << pkt->getPeerId()
1190                                 << " disconnecting peer!" << std::endl;
1191                 m_con.DisconnectPeer(pkt->getPeerId());
1192                 return;
1193         }
1194
1195         playersao->setBreath(breath);
1196         SendPlayerBreath(pkt->getPeerId());
1197 }
1198
1199 void Server::handleCommand_Password(NetworkPacket* pkt)
1200 {
1201         if (pkt->getSize() != PASSWORD_SIZE * 2)
1202                 return;
1203
1204         std::string oldpwd;
1205         std::string newpwd;
1206
1207         // Deny for clients using the new protocol
1208         RemoteClient* client = getClient(pkt->getPeerId(), CS_Created);
1209         if (client->net_proto_version >= 25) {
1210                 infostream << "Server::handleCommand_Password(): Denying change: "
1211                         << " Client protocol version for peer_id=" << pkt->getPeerId()
1212                         << " too new!" << std::endl;
1213                 return;
1214         }
1215
1216         for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
1217                 char c = pkt->getChar(i);
1218                 if (c == 0)
1219                         break;
1220                 oldpwd += c;
1221         }
1222
1223         for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
1224                 char c = pkt->getChar(PASSWORD_SIZE + i);
1225                 if (c == 0)
1226                         break;
1227                 newpwd += c;
1228         }
1229
1230         Player *player = m_env->getPlayer(pkt->getPeerId());
1231         if (player == NULL) {
1232                 errorstream << "Server::ProcessData(): Canceling: "
1233                                 "No player for peer_id=" << pkt->getPeerId()
1234                                 << " disconnecting peer!" << std::endl;
1235                 m_con.DisconnectPeer(pkt->getPeerId());
1236                 return;
1237         }
1238
1239         if (!base64_is_valid(newpwd)) {
1240                 infostream<<"Server: " << player->getName() <<
1241                                 " supplied invalid password hash" << std::endl;
1242                 // Wrong old password supplied!!
1243                 SendChatMessage(pkt->getPeerId(), L"Invalid new password hash supplied. Password NOT changed.");
1244                 return;
1245         }
1246
1247         infostream << "Server: Client requests a password change from "
1248                         << "'" << oldpwd << "' to '" << newpwd << "'" << std::endl;
1249
1250         std::string playername = player->getName();
1251
1252         std::string checkpwd;
1253         m_script->getAuth(playername, &checkpwd, NULL);
1254
1255         if (oldpwd != checkpwd) {
1256                 infostream << "Server: invalid old password" << std::endl;
1257                 // Wrong old password supplied!!
1258                 SendChatMessage(pkt->getPeerId(), L"Invalid old password supplied. Password NOT changed.");
1259                 return;
1260         }
1261
1262         bool success = m_script->setPassword(playername, newpwd);
1263         if (success) {
1264                 actionstream << player->getName() << " changes password" << std::endl;
1265                 SendChatMessage(pkt->getPeerId(), L"Password change successful.");
1266         } else {
1267                 actionstream << player->getName() << " tries to change password but "
1268                                 << "it fails" << std::endl;
1269                 SendChatMessage(pkt->getPeerId(), L"Password change failed or unavailable.");
1270         }
1271 }
1272
1273 void Server::handleCommand_PlayerItem(NetworkPacket* pkt)
1274 {
1275         if (pkt->getSize() < 2)
1276                 return;
1277
1278         Player *player = m_env->getPlayer(pkt->getPeerId());
1279         if (player == NULL) {
1280                 errorstream << "Server::ProcessData(): Canceling: "
1281                                 "No player for peer_id=" << pkt->getPeerId()
1282                                 << " disconnecting peer!" << std::endl;
1283                 m_con.DisconnectPeer(pkt->getPeerId());
1284                 return;
1285         }
1286
1287         PlayerSAO *playersao = player->getPlayerSAO();
1288         if (playersao == NULL) {
1289                 errorstream << "Server::ProcessData(): Canceling: "
1290                                 "No player object for peer_id=" << pkt->getPeerId()
1291                                 << " disconnecting peer!" << std::endl;
1292                 m_con.DisconnectPeer(pkt->getPeerId());
1293                 return;
1294         }
1295
1296         u16 item;
1297
1298         *pkt >> item;
1299
1300         playersao->setWieldIndex(item);
1301 }
1302
1303 void Server::handleCommand_Respawn(NetworkPacket* pkt)
1304 {
1305         Player *player = m_env->getPlayer(pkt->getPeerId());
1306         if (player == NULL) {
1307                 errorstream << "Server::ProcessData(): Canceling: "
1308                                 "No player for peer_id=" << pkt->getPeerId()
1309                                 << " disconnecting peer!" << std::endl;
1310                 m_con.DisconnectPeer(pkt->getPeerId());
1311                 return;
1312         }
1313
1314         if (!player->isDead())
1315                 return;
1316
1317         RespawnPlayer(pkt->getPeerId());
1318
1319         actionstream << player->getName() << " respawns at "
1320                         << PP(player->getPosition()/BS) << std::endl;
1321
1322         // ActiveObject is added to environment in AsyncRunStep after
1323         // the previous addition has been successfully removed
1324 }
1325
1326 void Server::handleCommand_Interact(NetworkPacket* pkt)
1327 {
1328         std::string datastring(pkt->getString(0), pkt->getSize());
1329         std::istringstream is(datastring, std::ios_base::binary);
1330
1331         /*
1332                 [0] u16 command
1333                 [2] u8 action
1334                 [3] u16 item
1335                 [5] u32 length of the next item
1336                 [9] serialized PointedThing
1337                 actions:
1338                 0: start digging (from undersurface) or use
1339                 1: stop digging (all parameters ignored)
1340                 2: digging completed
1341                 3: place block or item (to abovesurface)
1342                 4: use item
1343         */
1344         u8 action = readU8(is);
1345         u16 item_i = readU16(is);
1346         std::istringstream tmp_is(deSerializeLongString(is), std::ios::binary);
1347         PointedThing pointed;
1348         pointed.deSerialize(tmp_is);
1349
1350         verbosestream << "TOSERVER_INTERACT: action=" << (int)action << ", item="
1351                         << item_i << ", pointed=" << pointed.dump() << std::endl;
1352
1353         Player *player = m_env->getPlayer(pkt->getPeerId());
1354         if (player == NULL) {
1355                 errorstream << "Server::ProcessData(): Canceling: "
1356                                 "No player for peer_id=" << pkt->getPeerId()
1357                                 << " disconnecting peer!" << std::endl;
1358                 m_con.DisconnectPeer(pkt->getPeerId());
1359                 return;
1360         }
1361
1362         PlayerSAO *playersao = player->getPlayerSAO();
1363         if (playersao == NULL) {
1364                 errorstream << "Server::ProcessData(): Canceling: "
1365                                 "No player object for peer_id=" << pkt->getPeerId()
1366                                 << " disconnecting peer!" << std::endl;
1367                 m_con.DisconnectPeer(pkt->getPeerId());
1368                 return;
1369         }
1370
1371         if (player->isDead()) {
1372                 verbosestream << "TOSERVER_INTERACT: " << player->getName()
1373                         << " is dead. Ignoring packet";
1374                 return;
1375         }
1376
1377         v3f player_pos = playersao->getLastGoodPosition();
1378
1379         // Update wielded item
1380         playersao->setWieldIndex(item_i);
1381
1382         // Get pointed to node (undefined if not POINTEDTYPE_NODE)
1383         v3s16 p_under = pointed.node_undersurface;
1384         v3s16 p_above = pointed.node_abovesurface;
1385
1386         // Get pointed to object (NULL if not POINTEDTYPE_OBJECT)
1387         ServerActiveObject *pointed_object = NULL;
1388         if (pointed.type == POINTEDTHING_OBJECT) {
1389                 pointed_object = m_env->getActiveObject(pointed.object_id);
1390                 if (pointed_object == NULL) {
1391                         verbosestream << "TOSERVER_INTERACT: "
1392                                 "pointed object is NULL" << std::endl;
1393                         return;
1394                 }
1395
1396         }
1397
1398         v3f pointed_pos_under = player_pos;
1399         v3f pointed_pos_above = player_pos;
1400         if (pointed.type == POINTEDTHING_NODE) {
1401                 pointed_pos_under = intToFloat(p_under, BS);
1402                 pointed_pos_above = intToFloat(p_above, BS);
1403         }
1404         else if (pointed.type == POINTEDTHING_OBJECT) {
1405                 pointed_pos_under = pointed_object->getBasePosition();
1406                 pointed_pos_above = pointed_pos_under;
1407         }
1408
1409         /*
1410                 Check that target is reasonably close
1411                 (only when digging or placing things)
1412         */
1413         if (action == 0 || action == 2 || action == 3) {
1414                 float d = player_pos.getDistanceFrom(pointed_pos_under);
1415                 float max_d = BS * 14; // Just some large enough value
1416                 if (d > max_d) {
1417                         actionstream << "Player " << player->getName()
1418                                         << " tried to access " << pointed.dump()
1419                                         << " from too far: "
1420                                         << "d=" << d <<", max_d=" << max_d
1421                                         << ". ignoring." << std::endl;
1422                         // Re-send block to revert change on client-side
1423                         RemoteClient *client = getClient(pkt->getPeerId());
1424                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1425                         client->SetBlockNotSent(blockpos);
1426                         // Call callbacks
1427                         m_script->on_cheat(playersao, "interacted_too_far");
1428                         // Do nothing else
1429                         return;
1430                 }
1431         }
1432
1433         /*
1434                 Make sure the player is allowed to do it
1435         */
1436         if (!checkPriv(player->getName(), "interact")) {
1437                 actionstream<<player->getName()<<" attempted to interact with "
1438                                 <<pointed.dump()<<" without 'interact' privilege"
1439                                 <<std::endl;
1440                 // Re-send block to revert change on client-side
1441                 RemoteClient *client = getClient(pkt->getPeerId());
1442                 // Digging completed -> under
1443                 if (action == 2) {
1444                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1445                         client->SetBlockNotSent(blockpos);
1446                 }
1447                 // Placement -> above
1448                 if (action == 3) {
1449                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
1450                         client->SetBlockNotSent(blockpos);
1451                 }
1452                 return;
1453         }
1454
1455         /*
1456                 If something goes wrong, this player is to blame
1457         */
1458         RollbackScopeActor rollback_scope(m_rollback,
1459                         std::string("player:")+player->getName());
1460
1461         /*
1462                 0: start digging or punch object
1463         */
1464         if (action == 0) {
1465                 if (pointed.type == POINTEDTHING_NODE) {
1466                         /*
1467                                 NOTE: This can be used in the future to check if
1468                                 somebody is cheating, by checking the timing.
1469                         */
1470                         MapNode n(CONTENT_IGNORE);
1471                         bool pos_ok;
1472                         n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1473                         if (pos_ok)
1474                                 n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1475
1476                         if (!pos_ok) {
1477                                 infostream << "Server: Not punching: Node not found."
1478                                                 << " Adding block to emerge queue."
1479                                                 << std::endl;
1480                                 m_emerge->enqueueBlockEmerge(pkt->getPeerId(), getNodeBlockPos(p_above), false);
1481                         }
1482
1483                         if (n.getContent() != CONTENT_IGNORE)
1484                                 m_script->node_on_punch(p_under, n, playersao, pointed);
1485                         // Cheat prevention
1486                         playersao->noCheatDigStart(p_under);
1487                 }
1488                 else if (pointed.type == POINTEDTHING_OBJECT) {
1489                         // Skip if object has been removed
1490                         if (pointed_object->m_removed)
1491                                 return;
1492
1493                         actionstream<<player->getName()<<" punches object "
1494                                         <<pointed.object_id<<": "
1495                                         <<pointed_object->getDescription()<<std::endl;
1496
1497                         ItemStack punchitem = playersao->getWieldedItem();
1498                         ToolCapabilities toolcap =
1499                                         punchitem.getToolCapabilities(m_itemdef);
1500                         v3f dir = (pointed_object->getBasePosition() -
1501                                         (player->getPosition() + player->getEyeOffset())
1502                                                 ).normalize();
1503                         float time_from_last_punch =
1504                                 playersao->resetTimeFromLastPunch();
1505
1506                         s16 src_original_hp = pointed_object->getHP();
1507                         s16 dst_origin_hp = playersao->getHP();
1508
1509                         pointed_object->punch(dir, &toolcap, playersao,
1510                                         time_from_last_punch);
1511
1512                         // If the object is a player and its HP changed
1513                         if (src_original_hp != pointed_object->getHP() &&
1514                                         pointed_object->getType() == ACTIVEOBJECT_TYPE_PLAYER) {
1515                                 SendPlayerHPOrDie((PlayerSAO *)pointed_object);
1516                         }
1517
1518                         // If the puncher is a player and its HP changed
1519                         if (dst_origin_hp != playersao->getHP())
1520                                 SendPlayerHPOrDie(playersao);
1521                 }
1522
1523         } // action == 0
1524
1525         /*
1526                 1: stop digging
1527         */
1528         else if (action == 1) {
1529         } // action == 1
1530
1531         /*
1532                 2: Digging completed
1533         */
1534         else if (action == 2) {
1535                 // Only digging of nodes
1536                 if (pointed.type == POINTEDTHING_NODE) {
1537                         bool pos_ok;
1538                         MapNode n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1539                         if (!pos_ok) {
1540                                 infostream << "Server: Not finishing digging: Node not found."
1541                                                    << " Adding block to emerge queue."
1542                                                    << std::endl;
1543                                 m_emerge->enqueueBlockEmerge(pkt->getPeerId(), getNodeBlockPos(p_above), false);
1544                         }
1545
1546                         /* Cheat prevention */
1547                         bool is_valid_dig = true;
1548                         if (!isSingleplayer() && !g_settings->getBool("disable_anticheat")) {
1549                                 v3s16 nocheat_p = playersao->getNoCheatDigPos();
1550                                 float nocheat_t = playersao->getNoCheatDigTime();
1551                                 playersao->noCheatDigEnd();
1552                                 // If player didn't start digging this, ignore dig
1553                                 if (nocheat_p != p_under) {
1554                                         infostream << "Server: NoCheat: " << player->getName()
1555                                                         << " started digging "
1556                                                         << PP(nocheat_p) << " and completed digging "
1557                                                         << PP(p_under) << "; not digging." << std::endl;
1558                                         is_valid_dig = false;
1559                                         // Call callbacks
1560                                         m_script->on_cheat(playersao, "finished_unknown_dig");
1561                                 }
1562                                 // Get player's wielded item
1563                                 ItemStack playeritem;
1564                                 InventoryList *mlist = playersao->getInventory()->getList("main");
1565                                 if (mlist != NULL)
1566                                         playeritem = mlist->getItem(playersao->getWieldIndex());
1567                                 ToolCapabilities playeritem_toolcap =
1568                                                 playeritem.getToolCapabilities(m_itemdef);
1569                                 // Get diggability and expected digging time
1570                                 DigParams params = getDigParams(m_nodedef->get(n).groups,
1571                                                 &playeritem_toolcap);
1572                                 // If can't dig, try hand
1573                                 if (!params.diggable) {
1574                                         const ItemDefinition &hand = m_itemdef->get("");
1575                                         const ToolCapabilities *tp = hand.tool_capabilities;
1576                                         if (tp)
1577                                                 params = getDigParams(m_nodedef->get(n).groups, tp);
1578                                 }
1579                                 // If can't dig, ignore dig
1580                                 if (!params.diggable) {
1581                                         infostream << "Server: NoCheat: " << player->getName()
1582                                                         << " completed digging " << PP(p_under)
1583                                                         << ", which is not diggable with tool. not digging."
1584                                                         << std::endl;
1585                                         is_valid_dig = false;
1586                                         // Call callbacks
1587                                         m_script->on_cheat(playersao, "dug_unbreakable");
1588                                 }
1589                                 // Check digging time
1590                                 // If already invalidated, we don't have to
1591                                 if (!is_valid_dig) {
1592                                         // Well not our problem then
1593                                 }
1594                                 // Clean and long dig
1595                                 else if (params.time > 2.0 && nocheat_t * 1.2 > params.time) {
1596                                         // All is good, but grab time from pool; don't care if
1597                                         // it's actually available
1598                                         playersao->getDigPool().grab(params.time);
1599                                 }
1600                                 // Short or laggy dig
1601                                 // Try getting the time from pool
1602                                 else if (playersao->getDigPool().grab(params.time)) {
1603                                         // All is good
1604                                 }
1605                                 // Dig not possible
1606                                 else {
1607                                         infostream << "Server: NoCheat: " << player->getName()
1608                                                         << " completed digging " << PP(p_under)
1609                                                         << "too fast; not digging." << std::endl;
1610                                         is_valid_dig = false;
1611                                         // Call callbacks
1612                                         m_script->on_cheat(playersao, "dug_too_fast");
1613                                 }
1614                         }
1615
1616                         /* Actually dig node */
1617
1618                         if (is_valid_dig && n.getContent() != CONTENT_IGNORE)
1619                                 m_script->node_on_dig(p_under, n, playersao);
1620
1621                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1622                         RemoteClient *client = getClient(pkt->getPeerId());
1623                         // Send unusual result (that is, node not being removed)
1624                         if (m_env->getMap().getNodeNoEx(p_under).getContent() != CONTENT_AIR) {
1625                                 // Re-send block to revert change on client-side
1626                                 client->SetBlockNotSent(blockpos);
1627                         }
1628                         else {
1629                                 client->ResendBlockIfOnWire(blockpos);
1630                         }
1631                 }
1632         } // action == 2
1633
1634         /*
1635                 3: place block or right-click object
1636         */
1637         else if (action == 3) {
1638                 ItemStack item = playersao->getWieldedItem();
1639
1640                 // Reset build time counter
1641                 if (pointed.type == POINTEDTHING_NODE &&
1642                                 item.getDefinition(m_itemdef).type == ITEM_NODE)
1643                         getClient(pkt->getPeerId())->m_time_from_building = 0.0;
1644
1645                 if (pointed.type == POINTEDTHING_OBJECT) {
1646                         // Right click object
1647
1648                         // Skip if object has been removed
1649                         if (pointed_object->m_removed)
1650                                 return;
1651
1652                         actionstream << player->getName() << " right-clicks object "
1653                                         << pointed.object_id << ": "
1654                                         << pointed_object->getDescription() << std::endl;
1655
1656                         // Do stuff
1657                         pointed_object->rightClick(playersao);
1658                 }
1659                 else if (m_script->item_OnPlace(
1660                                 item, playersao, pointed)) {
1661                         // Placement was handled in lua
1662
1663                         // Apply returned ItemStack
1664                         if (playersao->setWieldedItem(item)) {
1665                                 SendInventory(playersao);
1666                         }
1667                 }
1668
1669                 // If item has node placement prediction, always send the
1670                 // blocks to make sure the client knows what exactly happened
1671                 RemoteClient *client = getClient(pkt->getPeerId());
1672                 v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
1673                 v3s16 blockpos2 = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1674                 if (item.getDefinition(m_itemdef).node_placement_prediction != "") {
1675                         client->SetBlockNotSent(blockpos);
1676                         if (blockpos2 != blockpos) {
1677                                 client->SetBlockNotSent(blockpos2);
1678                         }
1679                 }
1680                 else {
1681                         client->ResendBlockIfOnWire(blockpos);
1682                         if (blockpos2 != blockpos) {
1683                                 client->ResendBlockIfOnWire(blockpos2);
1684                         }
1685                 }
1686         } // action == 3
1687
1688         /*
1689                 4: use
1690         */
1691         else if (action == 4) {
1692                 ItemStack item = playersao->getWieldedItem();
1693
1694                 actionstream << player->getName() << " uses " << item.name
1695                                 << ", pointing at " << pointed.dump() << std::endl;
1696
1697                 if (m_script->item_OnUse(
1698                                 item, playersao, pointed)) {
1699                         // Apply returned ItemStack
1700                         if (playersao->setWieldedItem(item)) {
1701                                 SendInventory(playersao);
1702                         }
1703                 }
1704
1705         } // action == 4
1706
1707
1708         /*
1709                 Catch invalid actions
1710         */
1711         else {
1712                 infostream << "WARNING: Server: Invalid action "
1713                                 << action << std::endl;
1714         }
1715 }
1716
1717 void Server::handleCommand_RemovedSounds(NetworkPacket* pkt)
1718 {
1719         u16 num;
1720         *pkt >> num;
1721         for (u16 k = 0; k < num; k++) {
1722                 s32 id;
1723
1724                 *pkt >> id;
1725
1726                 std::map<s32, ServerPlayingSound>::iterator i =
1727                         m_playing_sounds.find(id);
1728
1729                 if (i == m_playing_sounds.end())
1730                         continue;
1731
1732                 ServerPlayingSound &psound = i->second;
1733                 psound.clients.erase(pkt->getPeerId());
1734                 if (psound.clients.empty())
1735                         m_playing_sounds.erase(i++);
1736         }
1737 }
1738
1739 void Server::handleCommand_NodeMetaFields(NetworkPacket* pkt)
1740 {
1741         v3s16 p;
1742         std::string formname;
1743         u16 num;
1744
1745         *pkt >> p >> formname >> num;
1746
1747         StringMap fields;
1748         for (u16 k = 0; k < num; k++) {
1749                 std::string fieldname;
1750                 *pkt >> fieldname;
1751                 fields[fieldname] = pkt->readLongString();
1752         }
1753
1754         Player *player = m_env->getPlayer(pkt->getPeerId());
1755         if (player == NULL) {
1756                 errorstream << "Server::ProcessData(): Canceling: "
1757                                 "No player for peer_id=" << pkt->getPeerId()
1758                                 << " disconnecting peer!" << std::endl;
1759                 m_con.DisconnectPeer(pkt->getPeerId());
1760                 return;
1761         }
1762
1763         PlayerSAO *playersao = player->getPlayerSAO();
1764         if (playersao == NULL) {
1765                 errorstream << "Server::ProcessData(): Canceling: "
1766                                 "No player object for peer_id=" << pkt->getPeerId()
1767                                 << " disconnecting peer!"  << std::endl;
1768                 m_con.DisconnectPeer(pkt->getPeerId());
1769                 return;
1770         }
1771
1772         // If something goes wrong, this player is to blame
1773         RollbackScopeActor rollback_scope(m_rollback,
1774                         std::string("player:")+player->getName());
1775
1776         // Check the target node for rollback data; leave others unnoticed
1777         RollbackNode rn_old(&m_env->getMap(), p, this);
1778
1779         m_script->node_on_receive_fields(p, formname, fields, playersao);
1780
1781         // Report rollback data
1782         RollbackNode rn_new(&m_env->getMap(), p, this);
1783         if (rollback() && rn_new != rn_old) {
1784                 RollbackAction action;
1785                 action.setSetNode(p, rn_old, rn_new);
1786                 rollback()->reportAction(action);
1787         }
1788 }
1789
1790 void Server::handleCommand_InventoryFields(NetworkPacket* pkt)
1791 {
1792         std::string formname;
1793         u16 num;
1794
1795         *pkt >> formname >> num;
1796
1797         StringMap fields;
1798         for (u16 k = 0; k < num; k++) {
1799                 std::string fieldname;
1800                 *pkt >> fieldname;
1801                 fields[fieldname] = pkt->readLongString();
1802         }
1803
1804         Player *player = m_env->getPlayer(pkt->getPeerId());
1805         if (player == NULL) {
1806                 errorstream << "Server::ProcessData(): Canceling: "
1807                                 "No player for peer_id=" << pkt->getPeerId()
1808                                 << " disconnecting peer!" << std::endl;
1809                 m_con.DisconnectPeer(pkt->getPeerId());
1810                 return;
1811         }
1812
1813         PlayerSAO *playersao = player->getPlayerSAO();
1814         if (playersao == NULL) {
1815                 errorstream << "Server::ProcessData(): Canceling: "
1816                                 "No player object for peer_id=" << pkt->getPeerId()
1817                                 << " disconnecting peer!" << std::endl;
1818                 m_con.DisconnectPeer(pkt->getPeerId());
1819                 return;
1820         }
1821
1822         m_script->on_playerReceiveFields(playersao, formname, fields);
1823 }
1824
1825 void Server::handleCommand_FirstSrp(NetworkPacket* pkt)
1826 {
1827         RemoteClient* client = getClient(pkt->getPeerId(), CS_Invalid);
1828         ClientState cstate = client->getState();
1829
1830         std::string playername = client->getName();
1831
1832         std::string salt;
1833         std::string verification_key;
1834
1835         std::string addr_s = getPeerAddress(pkt->getPeerId()).serializeString();
1836         u8 is_empty;
1837
1838         *pkt >> salt >> verification_key >> is_empty;
1839
1840         verbosestream << "Server: Got TOSERVER_FIRST_SRP from " << addr_s
1841                 << ", with is_empty= " << is_empty << std::endl;
1842
1843         // Either this packet is sent because the user is new or to change the password
1844         if (cstate == CS_HelloSent) {
1845                 if (!client->isMechAllowed(AUTH_MECHANISM_FIRST_SRP)) {
1846                         actionstream << "Server: Client from " << addr_s
1847                                         << " tried to set password without being "
1848                                         << "authenticated, or the username being new." << std::endl;
1849                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1850                         return;
1851                 }
1852
1853                 if (!isSingleplayer() &&
1854                                 g_settings->getBool("disallow_empty_password") &&
1855                                 is_empty == 1) {
1856                         actionstream << "Server: " << playername
1857                                         << " supplied empty password from " << addr_s << std::endl;
1858                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_EMPTY_PASSWORD);
1859                         return;
1860                 }
1861
1862                 std::string initial_ver_key;
1863
1864                 initial_ver_key = encodeSRPVerifier(verification_key, salt);
1865                 m_script->createAuth(playername, initial_ver_key);
1866
1867                 acceptAuth(pkt->getPeerId(), false);
1868         } else {
1869                 if (cstate < CS_SudoMode) {
1870                         infostream << "Server::ProcessData(): Ignoring TOSERVER_FIRST_SRP from "
1871                                         << addr_s << ": " << "Client has wrong state " << cstate << "."
1872                                         << std::endl;
1873                         return;
1874                 }
1875                 m_clients.event(pkt->getPeerId(), CSE_SudoLeave);
1876                 std::string pw_db_field = encodeSRPVerifier(verification_key, salt);
1877                 bool success = m_script->setPassword(playername, pw_db_field);
1878                 if (success) {
1879                         actionstream << playername << " changes password" << std::endl;
1880                         SendChatMessage(pkt->getPeerId(), L"Password change successful.");
1881                 } else {
1882                         actionstream << playername << " tries to change password but "
1883                                 << "it fails" << std::endl;
1884                         SendChatMessage(pkt->getPeerId(), L"Password change failed or unavailable.");
1885                 }
1886         }
1887 }
1888
1889 void Server::handleCommand_SrpBytesA(NetworkPacket* pkt)
1890 {
1891         RemoteClient* client = getClient(pkt->getPeerId(), CS_Invalid);
1892         ClientState cstate = client->getState();
1893
1894         bool wantSudo = (cstate == CS_Active);
1895
1896         if (!((cstate == CS_HelloSent) || (cstate == CS_Active))) {
1897                 actionstream << "Server: got SRP _A packet in wrong state "
1898                         << cstate << " from "
1899                         << getPeerAddress(pkt->getPeerId()).serializeString()
1900                         << ". Ignoring." << std::endl;
1901                 return;
1902         }
1903
1904         if (client->chosen_mech != AUTH_MECHANISM_NONE) {
1905                 actionstream << "Server: got SRP _A packet, while auth"
1906                         << "is already going on with mech " << client->chosen_mech
1907                         << " from " << getPeerAddress(pkt->getPeerId()).serializeString()
1908                         << " (wantSudo=" << wantSudo << "). Ignoring." << std::endl;
1909                 if (wantSudo) {
1910                         DenySudoAccess(pkt->getPeerId());
1911                         return;
1912                 } else {
1913                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1914                         return;
1915                 }
1916         }
1917
1918         std::string bytes_A;
1919         u8 based_on;
1920         *pkt >> bytes_A >> based_on;
1921
1922         infostream << "Server: TOSERVER_SRP_BYTES_A received with "
1923                 << "based_on=" << int(based_on) << " and len_A="
1924                 << bytes_A.length() << "." << std::endl;
1925
1926         AuthMechanism chosen = (based_on == 0) ?
1927                 AUTH_MECHANISM_LEGACY_PASSWORD : AUTH_MECHANISM_SRP;
1928
1929         if (wantSudo) {
1930                 if (!client->isSudoMechAllowed(chosen)) {
1931                         actionstream << "Server: Player \"" << client->getName()
1932                                 << "\" at " << getPeerAddress(pkt->getPeerId()).serializeString()
1933                                 << " tried to change password using unallowed mech "
1934                                 << chosen << "." << std::endl;
1935                         DenySudoAccess(pkt->getPeerId());
1936                         return;
1937                 }
1938         } else {
1939                 if (!client->isMechAllowed(chosen)) {
1940                         actionstream << "Server: Client tried to authenticate from "
1941                                 << getPeerAddress(pkt->getPeerId()).serializeString()
1942                                 << " using unallowed mech " << chosen << "." << std::endl;
1943                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1944                         return;
1945                 }
1946         }
1947
1948         client->chosen_mech = chosen;
1949
1950         std::string bytes_s;
1951         std::string bytes_v;
1952
1953         if (based_on == 0) {
1954                 char *p_bytes_s = 0;
1955                 size_t len_s = 0;
1956                 char *p_bytes_v = 0;
1957                 size_t len_v = 0;
1958                 getSRPVerifier(client->getName(), client->enc_pwd,
1959                         &p_bytes_s, &len_s,
1960                         &p_bytes_v, &len_v);
1961                 bytes_s = std::string(p_bytes_s, len_s);
1962                 bytes_v = std::string(p_bytes_v, len_v);
1963                 free(p_bytes_s);
1964                 free(p_bytes_v);
1965         } else if (!decodeSRPVerifier(client->enc_pwd, &bytes_s, &bytes_v)) {
1966                 // Non-base64 errors should have been catched in the init handler
1967                 actionstream << "Server: User " << client->getName()
1968                         << " tried to log in, but srp verifier field"
1969                         << " was invalid (most likely invalid base64)." << std::endl;
1970                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
1971                 return;
1972         }
1973
1974         char *bytes_B = 0;
1975         size_t len_B = 0;
1976
1977         client->auth_data = srp_verifier_new(SRP_SHA256, SRP_NG_2048,
1978                 client->getName().c_str(),
1979                 (const unsigned char *) bytes_s.c_str(), bytes_s.size(),
1980                 (const unsigned char *) bytes_v.c_str(), bytes_v.size(),
1981                 (const unsigned char *) bytes_A.c_str(), bytes_A.size(),
1982                 NULL, 0,
1983                 (unsigned char **) &bytes_B, &len_B, NULL, NULL);
1984
1985         if (!bytes_B) {
1986                 actionstream << "Server: User " << client->getName()
1987                         << " tried to log in, SRP-6a safety check violated in _A handler."
1988                         << std::endl;
1989                 if (wantSudo) {
1990                         DenySudoAccess(pkt->getPeerId());
1991                         return;
1992                 } else {
1993                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1994                         return;
1995                 }
1996         }
1997
1998         NetworkPacket resp_pkt(TOCLIENT_SRP_BYTES_S_B, 0, pkt->getPeerId());
1999         resp_pkt << bytes_s << std::string(bytes_B, len_B);
2000         Send(&resp_pkt);
2001 }
2002
2003 void Server::handleCommand_SrpBytesM(NetworkPacket* pkt)
2004 {
2005         RemoteClient* client = getClient(pkt->getPeerId(), CS_Invalid);
2006         ClientState cstate = client->getState();
2007
2008         bool wantSudo = (cstate == CS_Active);
2009
2010         verbosestream << "Server: Recieved TOCLIENT_SRP_BYTES_M." << std::endl;
2011
2012         if (!((cstate == CS_HelloSent) || (cstate == CS_Active))) {
2013                 actionstream << "Server: got SRP _M packet in wrong state "
2014                         << cstate << " from "
2015                         << getPeerAddress(pkt->getPeerId()).serializeString()
2016                         << ". Ignoring." << std::endl;
2017                 return;
2018         }
2019
2020         if ((client->chosen_mech != AUTH_MECHANISM_SRP)
2021                 && (client->chosen_mech != AUTH_MECHANISM_LEGACY_PASSWORD)) {
2022                 actionstream << "Server: got SRP _M packet, while auth"
2023                         << "is going on with mech " << client->chosen_mech
2024                         << " from " << getPeerAddress(pkt->getPeerId()).serializeString()
2025                         << " (wantSudo=" << wantSudo << "). Denying." << std::endl;
2026                 if (wantSudo) {
2027                         DenySudoAccess(pkt->getPeerId());
2028                         return;
2029                 } else {
2030                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
2031                         return;
2032                 }
2033         }
2034
2035         std::string bytes_M;
2036         *pkt >> bytes_M;
2037
2038         if (srp_verifier_get_session_key_length((SRPVerifier *) client->auth_data)
2039                         != bytes_M.size()) {
2040                 actionstream << "Server: User " << client->getName()
2041                         << " at " << getPeerAddress(pkt->getPeerId()).serializeString()
2042                         << " sent bytes_M with invalid length " << bytes_M.size() << std::endl;
2043                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
2044                 return;
2045         }
2046
2047         unsigned char *bytes_HAMK = 0;
2048
2049         srp_verifier_verify_session((SRPVerifier *) client->auth_data,
2050                 (unsigned char *)bytes_M.c_str(), &bytes_HAMK);
2051
2052         if (!bytes_HAMK) {
2053                 if (wantSudo) {
2054                         actionstream << "Server: User " << client->getName()
2055                                 << " at " << getPeerAddress(pkt->getPeerId()).serializeString()
2056                                 << " tried to change their password, but supplied wrong"
2057                                 << " (SRP) password for authentication." << std::endl;
2058                         DenySudoAccess(pkt->getPeerId());
2059                         return;
2060                 } else {
2061                         actionstream << "Server: User " << client->getName()
2062                                 << " at " << getPeerAddress(pkt->getPeerId()).serializeString()
2063                                 << " supplied wrong (SRP) password from address "
2064                                 << getPeerAddress(pkt->getPeerId()).serializeString()
2065                                 << "." << std::endl;
2066                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_PASSWORD);
2067                         return;
2068                 }
2069         }
2070
2071         if (client->create_player_on_auth_success) {
2072                 std::string playername = client->getName();
2073                 m_script->createAuth(playername, client->enc_pwd);
2074
2075                 std::string checkpwd; // not used, but needed for passing something
2076                 if (!m_script->getAuth(playername, &checkpwd, NULL)) {
2077                         actionstream << "Server: " << playername << " cannot be authenticated"
2078                                 << " (auth handler does not work?)" << std::endl;
2079                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
2080                         return;
2081                 }
2082                 client->create_player_on_auth_success = false;
2083         }
2084
2085         acceptAuth(pkt->getPeerId(), wantSudo);
2086 }