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 "mapblock.h"
  27 #include "nodedef.h"
  28 #include "player.h"
  29 #include "rollback_interface.h"
  30 #include "serverscripting.h"
  31 #include "settings.h"
  32 #include "tool.h"
  33 #include "version.h"
  34 #include "network/networkprotocol.h"
  35 #include "network/serveropcodes.h"
  36 #include "util/auth.h"
  37 #include "util/base64.h"
  38 #include "util/pointedthing.h"
  39 #include "util/serialize.h"
  40 #include "util/srp.h"
  41
  42 void Server::handleCommand_Deprecated(NetworkPacket* pkt)
  43 {
  44         infostream << "Server: " << toServerCommandTable[pkt->getCommand()].name
  45                 << " not supported anymore" << std::endl;
  46 }
  47
  48 void Server::handleCommand_Init(NetworkPacket* pkt)
  49 {
  50
  51         if(pkt->getSize() < 1)
  52                 return;
  53
  54         RemoteClient* client = getClient(pkt->getPeerId(), CS_Created);
  55
  56         std::string addr_s;
  57         try {
  58                 Address address = getPeerAddress(pkt->getPeerId());
  59                 addr_s = address.serializeString();
  60         }
  61         catch (con::PeerNotFoundException &e) {
  62                 /*
  63                  * no peer for this packet found
  64                  * most common reason is peer timeout, e.g. peer didn't
  65                  * respond for some time, your server was overloaded or
  66                  * things like that.
  67                  */
  68                 infostream << "Server::ProcessData(): Canceling: peer "
  69                                 << pkt->getPeerId() << " not found" << std::endl;
  70                 return;
  71         }
  72
  73         // If net_proto_version is set, this client has already been handled
  74         if (client->getState() > CS_Created) {
  75                 verbosestream << "Server: Ignoring multiple TOSERVER_INITs from "
  76                                 << addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl;
  77                 return;
  78         }
  79
  80         verbosestream << "Server: Got TOSERVER_INIT from " << addr_s << " (peer_id="
  81                         << pkt->getPeerId() << ")" << std::endl;
  82
  83         // Do not allow multiple players in simple singleplayer mode.
  84         // This isn't a perfect way to do it, but will suffice for now
  85         if (m_simple_singleplayer_mode && m_clients.getClientIDs().size() > 1) {
  86                 infostream << "Server: Not allowing another client (" << addr_s
  87                                 << ") to connect in simple singleplayer mode" << std::endl;
  88                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SINGLEPLAYER);
  89                 return;
  90         }
  91
  92         // First byte after command is maximum supported
  93         // serialization version
  94         u8 client_max;
  95         u16 supp_compr_modes;
  96         u16 min_net_proto_version = 0;
  97         u16 max_net_proto_version;
  98         std::string playerName;
  99
 100         *pkt >> client_max >> supp_compr_modes >> min_net_proto_version
 101                         >> max_net_proto_version >> playerName;
 102
 103         u8 our_max = SER_FMT_VER_HIGHEST_READ;
 104         // Use the highest version supported by both
 105         u8 depl_serial_v = std::min(client_max, our_max);
 106         // If it's lower than the lowest supported, give up.
 107         if (depl_serial_v < SER_FMT_VER_LOWEST_READ)
 108                 depl_serial_v = SER_FMT_VER_INVALID;
 109
 110         if (depl_serial_v == SER_FMT_VER_INVALID) {
 111                 actionstream << "Server: A mismatched client tried to connect from "
 112                                 << addr_s << std::endl;
 113                 infostream<<"Server: Cannot negotiate serialization version with "
 114                                 << addr_s << std::endl;
 115                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION);
 116                 return;
 117         }
 118
 119         client->setPendingSerializationVersion(depl_serial_v);
 120
 121         /*
 122                 Read and check network protocol version
 123         */
 124
 125         u16 net_proto_version = 0;
 126
 127         // Figure out a working version if it is possible at all
 128         if (max_net_proto_version >= SERVER_PROTOCOL_VERSION_MIN ||
 129                         min_net_proto_version <= SERVER_PROTOCOL_VERSION_MAX) {
 130                 // If maximum is larger than our maximum, go with our maximum
 131                 if (max_net_proto_version > SERVER_PROTOCOL_VERSION_MAX)
 132                         net_proto_version = SERVER_PROTOCOL_VERSION_MAX;
 133                 // Else go with client's maximum
 134                 else
 135                         net_proto_version = max_net_proto_version;
 136         }
 137
 138         verbosestream << "Server: " << addr_s << ": Protocol version: min: "
 139                         << min_net_proto_version << ", max: " << max_net_proto_version
 140                         << ", chosen: " << net_proto_version << std::endl;
 141
 142         client->net_proto_version = net_proto_version;
 143
 144         // On this handler at least protocol version 25 is required
 145         if (net_proto_version < 25 ||
 146                         net_proto_version < SERVER_PROTOCOL_VERSION_MIN ||
 147                         net_proto_version > SERVER_PROTOCOL_VERSION_MAX) {
 148                 actionstream << "Server: A mismatched client tried to connect from "
 149                                 << addr_s << std::endl;
 150                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION);
 151                 return;
 152         }
 153
 154         if (g_settings->getBool("strict_protocol_version_checking")) {
 155                 if (net_proto_version != LATEST_PROTOCOL_VERSION) {
 156                         actionstream << "Server: A mismatched (strict) client tried to "
 157                                         << "connect from " << addr_s << std::endl;
 158                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION);
 159                         return;
 160                 }
 161         }
 162
 163         /*
 164                 Validate player name
 165         */
 166         const char* playername = playerName.c_str();
 167
 168         size_t pns = playerName.size();
 169         if (pns == 0 || pns > PLAYERNAME_SIZE) {
 170                 actionstream << "Server: Player with "
 171                         << ((pns > PLAYERNAME_SIZE) ? "a too long" : "an empty")
 172                         << " name tried to connect from " << addr_s << std::endl;
 173                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_NAME);
 174                 return;
 175         }
 176
 177         if (string_allowed(playerName, PLAYERNAME_ALLOWED_CHARS) == false) {
 178                 actionstream << "Server: Player with an invalid name "
 179                                 << "tried to connect from " << addr_s << std::endl;
 180                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_CHARS_IN_NAME);
 181                 return;
 182         }
 183
 184         m_clients.setPlayerName(pkt->getPeerId(), playername);
 185         //TODO (later) case insensitivity
 186
 187         std::string legacyPlayerNameCasing = playerName;
 188
 189         if (!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0) {
 190                 actionstream << "Server: Player with the name \"singleplayer\" "
 191                                 << "tried to connect from " << addr_s << std::endl;
 192                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_NAME);
 193                 return;
 194         }
 195
 196         {
 197                 std::string reason;
 198                 if (m_script->on_prejoinplayer(playername, addr_s, &reason)) {
 199                         actionstream << "Server: Player with the name \"" << playerName << "\" "
 200                                         << "tried to connect from " << addr_s << " "
 201                                         << "but it was disallowed for the following reason: "
 202                                         << reason << std::endl;
 203                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_CUSTOM_STRING,
 204                                         reason.c_str());
 205                         return;
 206                 }
 207         }
 208
 209         infostream << "Server: New connection: \"" << playerName << "\" from "
 210                         << addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl;
 211
 212         // Enforce user limit.
 213         // Don't enforce for users that have some admin right
 214         if (m_clients.getClientIDs(CS_Created).size() >= g_settings->getU16("max_users") &&
 215                         !checkPriv(playername, "server") &&
 216                         !checkPriv(playername, "ban") &&
 217                         !checkPriv(playername, "privs") &&
 218                         !checkPriv(playername, "password") &&
 219                         playername != g_settings->get("name")) {
 220                 actionstream << "Server: " << playername << " tried to join from "
 221                                 << addr_s << ", but there" << " are already max_users="
 222                                 << g_settings->getU16("max_users") << " players." << std::endl;
 223                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_TOO_MANY_USERS);
 224                 return;
 225         }
 226
 227         /*
 228                 Compose auth methods for answer
 229         */
 230         std::string encpwd; // encrypted Password field for the user
 231         bool has_auth = m_script->getAuth(playername, &encpwd, NULL);
 232         u32 auth_mechs = 0;
 233
 234         client->chosen_mech = AUTH_MECHANISM_NONE;
 235
 236         if (has_auth) {
 237                 std::vector<std::string> pwd_components = str_split(encpwd, '#');
 238                 if (pwd_components.size() == 4) {
 239                         if (pwd_components[1] == "1") { // 1 means srp
 240                                 auth_mechs |= AUTH_MECHANISM_SRP;
 241                                 client->enc_pwd = encpwd;
 242                         } else {
 243                                 actionstream << "User " << playername
 244                                         << " tried to log in, but password field"
 245                                         << " was invalid (unknown mechcode)." << std::endl;
 246                                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
 247                                 return;
 248                         }
 249                 } else if (base64_is_valid(encpwd)) {
 250                         auth_mechs |= AUTH_MECHANISM_LEGACY_PASSWORD;
 251                         client->enc_pwd = encpwd;
 252                 } else {
 253                         actionstream << "User " << playername
 254                                 << " tried to log in, but password field"
 255                                 << " was invalid (invalid base64)." << std::endl;
 256                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
 257                         return;
 258                 }
 259         } else {
 260                 std::string default_password = g_settings->get("default_password");
 261                 if (default_password.length() == 0) {
 262                         auth_mechs |= AUTH_MECHANISM_FIRST_SRP;
 263                 } else {
 264                         // Take care of default passwords.
 265                         client->enc_pwd = get_encoded_srp_verifier(playerName, default_password);
 266                         auth_mechs |= AUTH_MECHANISM_SRP;
 267                         // Allocate player in db, but only on successful login.
 268                         client->create_player_on_auth_success = true;
 269                 }
 270         }
 271
 272         /*
 273                 Answer with a TOCLIENT_HELLO
 274         */
 275
 276         verbosestream << "Sending TOCLIENT_HELLO with auth method field: "
 277                 << auth_mechs << std::endl;
 278
 279         NetworkPacket resp_pkt(TOCLIENT_HELLO, 1 + 4
 280                 + legacyPlayerNameCasing.size(), pkt->getPeerId());
 281
 282         u16 depl_compress_mode = NETPROTO_COMPRESSION_NONE;
 283         resp_pkt << depl_serial_v << depl_compress_mode << net_proto_version
 284                 << auth_mechs << legacyPlayerNameCasing;
 285
 286         Send(&resp_pkt);
 287
 288         client->allowed_auth_mechs = auth_mechs;
 289         client->setDeployedCompressionMode(depl_compress_mode);
 290
 291         m_clients.event(pkt->getPeerId(), CSE_Hello);
 292 }
 293
 294 void Server::handleCommand_Init_Legacy(NetworkPacket* pkt)
 295 {
 296         // [0] u8 SER_FMT_VER_HIGHEST_READ
 297         // [1] u8[20] player_name
 298         // [21] u8[28] password <--- can be sent without this, from old versions
 299
 300         if (pkt->getSize() < 1+PLAYERNAME_SIZE)
 301                 return;
 302
 303         RemoteClient* client = getClient(pkt->getPeerId(), CS_Created);
 304
 305         std::string addr_s;
 306         try {
 307                 Address address = getPeerAddress(pkt->getPeerId());
 308                 addr_s = address.serializeString();
 309         }
 310         catch (con::PeerNotFoundException &e) {
 311                 /*
 312                  * no peer for this packet found
 313                  * most common reason is peer timeout, e.g. peer didn't
 314                  * respond for some time, your server was overloaded or
 315                  * things like that.
 316                  */
 317                 infostream << "Server::ProcessData(): Canceling: peer "
 318                                 << pkt->getPeerId() << " not found" << std::endl;
 319                 return;
 320         }
 321
 322         // If net_proto_version is set, this client has already been handled
 323         if (client->getState() > CS_Created) {
 324                 verbosestream << "Server: Ignoring multiple TOSERVER_INITs from "
 325                                 << addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl;
 326                 return;
 327         }
 328
 329         verbosestream << "Server: Got TOSERVER_INIT_LEGACY from " << addr_s << " (peer_id="
 330                         << pkt->getPeerId() << ")" << std::endl;
 331
 332         // Do not allow multiple players in simple singleplayer mode.
 333         // This isn't a perfect way to do it, but will suffice for now
 334         if (m_simple_singleplayer_mode && m_clients.getClientIDs().size() > 1) {
 335                 infostream << "Server: Not allowing another client (" << addr_s
 336                                 << ") to connect in simple singleplayer mode" << std::endl;
 337                 DenyAccess_Legacy(pkt->getPeerId(), L"Running in simple singleplayer mode.");
 338                 return;
 339         }
 340
 341         // First byte after command is maximum supported
 342         // serialization version
 343         u8 client_max;
 344
 345         *pkt >> client_max;
 346
 347         u8 our_max = SER_FMT_VER_HIGHEST_READ;
 348         // Use the highest version supported by both
 349         int deployed = std::min(client_max, our_max);
 350         // If it's lower than the lowest supported, give up.
 351         if (deployed < SER_FMT_VER_LOWEST_READ)
 352                 deployed = SER_FMT_VER_INVALID;
 353
 354         if (deployed == SER_FMT_VER_INVALID) {
 355                 actionstream << "Server: A mismatched client tried to connect from "
 356                                 << addr_s << std::endl;
 357                 infostream<<"Server: Cannot negotiate serialization version with "
 358                                 << addr_s << std::endl;
 359                 DenyAccess_Legacy(pkt->getPeerId(), std::wstring(
 360                                 L"Your client's version is not supported.\n"
 361                                 L"Server version is ")
 362                                 + utf8_to_wide(g_version_string) + L"."
 363                 );
 364                 return;
 365         }
 366
 367         client->setPendingSerializationVersion(deployed);
 368
 369         /*
 370                 Read and check network protocol version
 371         */
 372
 373         u16 min_net_proto_version = 0;
 374         if (pkt->getSize() >= 1 + PLAYERNAME_SIZE + PASSWORD_SIZE + 2)
 375                 min_net_proto_version = pkt->getU16(1 + PLAYERNAME_SIZE + PASSWORD_SIZE);
 376
 377         // Use same version as minimum and maximum if maximum version field
 378         // doesn't exist (backwards compatibility)
 379         u16 max_net_proto_version = min_net_proto_version;
 380         if (pkt->getSize() >= 1 + PLAYERNAME_SIZE + PASSWORD_SIZE + 2 + 2)
 381                 max_net_proto_version = pkt->getU16(1 + PLAYERNAME_SIZE + PASSWORD_SIZE + 2);
 382
 383         // Start with client's maximum version
 384         u16 net_proto_version = max_net_proto_version;
 385
 386         // Figure out a working version if it is possible at all
 387         if (max_net_proto_version >= SERVER_PROTOCOL_VERSION_MIN ||
 388                         min_net_proto_version <= SERVER_PROTOCOL_VERSION_MAX) {
 389                 // If maximum is larger than our maximum, go with our maximum
 390                 if (max_net_proto_version > SERVER_PROTOCOL_VERSION_MAX)
 391                         net_proto_version = SERVER_PROTOCOL_VERSION_MAX;
 392                 // Else go with client's maximum
 393                 else
 394                         net_proto_version = max_net_proto_version;
 395         }
 396
 397         // The client will send up to date init packet, ignore this one
 398         if (net_proto_version >= 25)
 399                 return;
 400
 401         verbosestream << "Server: " << addr_s << ": Protocol version: min: "
 402                         << min_net_proto_version << ", max: " << max_net_proto_version
 403                         << ", chosen: " << net_proto_version << std::endl;
 404
 405         client->net_proto_version = net_proto_version;
 406
 407         if (net_proto_version < SERVER_PROTOCOL_VERSION_MIN ||
 408                         net_proto_version > SERVER_PROTOCOL_VERSION_MAX) {
 409                 actionstream << "Server: A mismatched client tried to connect from "
 410                                 << addr_s << std::endl;
 411                 DenyAccess_Legacy(pkt->getPeerId(), std::wstring(
 412                                 L"Your client's version is not supported.\n"
 413                                 L"Server version is ")
 414                                 + utf8_to_wide(g_version_string) + L",\n"
 415                                 + L"server's PROTOCOL_VERSION is "
 416                                 + utf8_to_wide(itos(SERVER_PROTOCOL_VERSION_MIN))
 417                                 + L"..."
 418                                 + utf8_to_wide(itos(SERVER_PROTOCOL_VERSION_MAX))
 419                                 + L", client's PROTOCOL_VERSION is "
 420                                 + utf8_to_wide(itos(min_net_proto_version))
 421                                 + L"..."
 422                                 + utf8_to_wide(itos(max_net_proto_version))
 423                 );
 424                 return;
 425         }
 426
 427         if (g_settings->getBool("strict_protocol_version_checking")) {
 428                 if (net_proto_version != LATEST_PROTOCOL_VERSION) {
 429                         actionstream << "Server: A mismatched (strict) client tried to "
 430                                         << "connect from " << addr_s << std::endl;
 431                         DenyAccess_Legacy(pkt->getPeerId(), std::wstring(
 432                                         L"Your client's version is not supported.\n"
 433                                         L"Server version is ")
 434                                         + utf8_to_wide(g_version_string) + L",\n"
 435                                         + L"server's PROTOCOL_VERSION (strict) is "
 436                                         + utf8_to_wide(itos(LATEST_PROTOCOL_VERSION))
 437                                         + L", client's PROTOCOL_VERSION is "
 438                                         + utf8_to_wide(itos(min_net_proto_version))
 439                                         + L"..."
 440                                         + utf8_to_wide(itos(max_net_proto_version))
 441                         );
 442                         return;
 443                 }
 444         }
 445
 446         /*
 447                 Set up player
 448         */
 449         char playername[PLAYERNAME_SIZE];
 450         unsigned int playername_length = 0;
 451         for (; playername_length < PLAYERNAME_SIZE; playername_length++ ) {
 452                 playername[playername_length] = pkt->getChar(1+playername_length);
 453                 if (pkt->getChar(1+playername_length) == 0)
 454                         break;
 455         }
 456
 457         if (playername_length == PLAYERNAME_SIZE) {
 458                 actionstream << "Server: Player with name exceeding max length "
 459                                 << "tried to connect from " << addr_s << std::endl;
 460                 DenyAccess_Legacy(pkt->getPeerId(), L"Name too long");
 461                 return;
 462         }
 463
 464
 465         if (playername[0]=='\0') {
 466                 actionstream << "Server: Player with an empty name "
 467                                 << "tried to connect from " << addr_s << std::endl;
 468                 DenyAccess_Legacy(pkt->getPeerId(), L"Empty name");
 469                 return;
 470         }
 471
 472         if (string_allowed(playername, PLAYERNAME_ALLOWED_CHARS) == false) {
 473                 actionstream << "Server: Player with an invalid name "
 474                                 << "tried to connect from " << addr_s << std::endl;
 475                 DenyAccess_Legacy(pkt->getPeerId(), L"Name contains unallowed characters");
 476                 return;
 477         }
 478
 479         if (!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0) {
 480                 actionstream << "Server: Player with the name \"singleplayer\" "
 481                                 << "tried to connect from " << addr_s << std::endl;
 482                 DenyAccess_Legacy(pkt->getPeerId(), L"Name is not allowed");
 483                 return;
 484         }
 485
 486         {
 487                 std::string reason;
 488                 if (m_script->on_prejoinplayer(playername, addr_s, &reason)) {
 489                         actionstream << "Server: Player with the name \"" << playername << "\" "
 490                                         << "tried to connect from " << addr_s << " "
 491                                         << "but it was disallowed for the following reason: "
 492                                         << reason << std::endl;
 493                         DenyAccess_Legacy(pkt->getPeerId(), utf8_to_wide(reason.c_str()));
 494                         return;
 495                 }
 496         }
 497
 498         infostream<<"Server: New connection: \""<<playername<<"\" from "
 499                         <<addr_s<<" (peer_id="<<pkt->getPeerId()<<")"<<std::endl;
 500
 501         // Get password
 502         char given_password[PASSWORD_SIZE];
 503         if (pkt->getSize() < 1 + PLAYERNAME_SIZE + PASSWORD_SIZE) {
 504                 // old version - assume blank password
 505                 given_password[0] = 0;
 506         }
 507         else {
 508                 for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
 509                         given_password[i] = pkt->getChar(21 + i);
 510                 }
 511                 given_password[PASSWORD_SIZE - 1] = 0;
 512         }
 513
 514         if (!base64_is_valid(given_password)) {
 515                 actionstream << "Server: " << playername
 516                                 << " supplied invalid password hash" << std::endl;
 517                 DenyAccess_Legacy(pkt->getPeerId(), L"Invalid password hash");
 518                 return;
 519         }
 520
 521         // Enforce user limit.
 522         // Don't enforce for users that have some admin right
 523         if (m_clients.getClientIDs(CS_Created).size() >= g_settings->getU16("max_users") &&
 524                         !checkPriv(playername, "server") &&
 525                         !checkPriv(playername, "ban") &&
 526                         !checkPriv(playername, "privs") &&
 527                         !checkPriv(playername, "password") &&
 528                         playername != g_settings->get("name")) {
 529                 actionstream << "Server: " << playername << " tried to join, but there"
 530                                 << " are already max_users="
 531                                 << g_settings->getU16("max_users") << " players." << std::endl;
 532                 DenyAccess_Legacy(pkt->getPeerId(), L"Too many users.");
 533                 return;
 534         }
 535
 536         std::string checkpwd; // Password hash to check against
 537         bool has_auth = m_script->getAuth(playername, &checkpwd, NULL);
 538
 539         // If no authentication info exists for user, create it
 540         if (!has_auth) {
 541                 if (!isSingleplayer() &&
 542                                 g_settings->getBool("disallow_empty_password") &&
 543                                 std::string(given_password) == "") {
 544                         actionstream << "Server: " << playername
 545                                         << " supplied empty password" << std::endl;
 546                         DenyAccess_Legacy(pkt->getPeerId(), L"Empty passwords are "
 547                                         L"disallowed. Set a password and try again.");
 548                         return;
 549                 }
 550                 std::string raw_default_password =
 551                         g_settings->get("default_password");
 552                 std::string initial_password =
 553                         translate_password(playername, raw_default_password);
 554
 555                 // If default_password is empty, allow any initial password
 556                 if (raw_default_password.length() == 0)
 557                         initial_password = given_password;
 558
 559                 m_script->createAuth(playername, initial_password);
 560         }
 561
 562         has_auth = m_script->getAuth(playername, &checkpwd, NULL);
 563
 564         if (!has_auth) {
 565                 actionstream << "Server: " << playername << " cannot be authenticated"
 566                                 << " (auth handler does not work?)" << std::endl;
 567                 DenyAccess_Legacy(pkt->getPeerId(), L"Not allowed to login");
 568                 return;
 569         }
 570
 571         if (given_password != checkpwd) {
 572                 actionstream << "Server: User " << playername
 573                         << " at " << addr_s
 574                         << " supplied wrong password (auth mechanism: legacy)."
 575                         << std::endl;
 576                 DenyAccess_Legacy(pkt->getPeerId(), L"Wrong password");
 577                 return;
 578         }
 579
 580         RemotePlayer *player =
 581                         static_cast<RemotePlayer*>(m_env->getPlayer(playername));
 582
 583         if (player && player->peer_id != 0) {
 584                 actionstream << "Server: " << playername << ": Failed to emerge player"
 585                                 << " (player allocated to an another client)" << std::endl;
 586                 DenyAccess_Legacy(pkt->getPeerId(), L"Another client is connected with this "
 587                                 L"name. If your client closed unexpectedly, try again in "
 588                                 L"a minute.");
 589         }
 590
 591         m_clients.setPlayerName(pkt->getPeerId(), playername);
 592
 593         /*
 594                 Answer with a TOCLIENT_INIT
 595         */
 596
 597         NetworkPacket resp_pkt(TOCLIENT_INIT_LEGACY, 1 + 6 + 8 + 4,
 598                         pkt->getPeerId());
 599
 600         resp_pkt << (u8) deployed << (v3s16) floatToInt(v3f(0,0,0), BS)
 601                         << (u64) m_env->getServerMap().getSeed()
 602                         << g_settings->getFloat("dedicated_server_step");
 603
 604         Send(&resp_pkt);
 605         m_clients.event(pkt->getPeerId(), CSE_InitLegacy);
 606 }
 607
 608 void Server::handleCommand_Init2(NetworkPacket* pkt)
 609 {
 610         verbosestream << "Server: Got TOSERVER_INIT2 from "
 611                         << pkt->getPeerId() << std::endl;
 612
 613         m_clients.event(pkt->getPeerId(), CSE_GotInit2);
 614         u16 protocol_version = m_clients.getProtocolVersion(pkt->getPeerId());
 615
 616
 617         /*
 618                 Send some initialization data
 619         */
 620
 621         infostream << "Server: Sending content to "
 622                         << getPlayerName(pkt->getPeerId()) << std::endl;
 623
 624         // Send player movement settings
 625         SendMovement(pkt->getPeerId());
 626
 627         // Send item definitions
 628         SendItemDef(pkt->getPeerId(), m_itemdef, protocol_version);
 629
 630         // Send node definitions
 631         SendNodeDef(pkt->getPeerId(), m_nodedef, protocol_version);
 632
 633         m_clients.event(pkt->getPeerId(), CSE_SetDefinitionsSent);
 634
 635         // Send media announcement
 636         sendMediaAnnouncement(pkt->getPeerId());
 637
 638         // Send detached inventories
 639         sendDetachedInventories(pkt->getPeerId());
 640
 641         // Send time of day
 642         u16 time = m_env->getTimeOfDay();
 643         float time_speed = g_settings->getFloat("time_speed");
 644         SendTimeOfDay(pkt->getPeerId(), time, time_speed);
 645
 646         // Warnings about protocol version can be issued here
 647         if (getClient(pkt->getPeerId())->net_proto_version < LATEST_PROTOCOL_VERSION) {
 648                 SendChatMessage(pkt->getPeerId(), L"# Server: WARNING: YOUR CLIENT'S "
 649                                 L"VERSION MAY NOT BE FULLY COMPATIBLE WITH THIS SERVER!");
 650         }
 651 }
 652
 653 void Server::handleCommand_RequestMedia(NetworkPacket* pkt)
 654 {
 655         std::vector<std::string> tosend;
 656         u16 numfiles;
 657
 658         *pkt >> numfiles;
 659
 660         infostream << "Sending " << numfiles << " files to "
 661                         << getPlayerName(pkt->getPeerId()) << std::endl;
 662         verbosestream << "TOSERVER_REQUEST_MEDIA: " << std::endl;
 663
 664         for (u16 i = 0; i < numfiles; i++) {
 665                 std::string name;
 666
 667                 *pkt >> name;
 668
 669                 tosend.push_back(name);
 670                 verbosestream << "TOSERVER_REQUEST_MEDIA: requested file "
 671                                 << name << std::endl;
 672         }
 673
 674         sendRequestedMedia(pkt->getPeerId(), tosend);
 675 }
 676
 677 void Server::handleCommand_ReceivedMedia(NetworkPacket* pkt)
 678 {
 679 }
 680
 681 void Server::handleCommand_ClientReady(NetworkPacket* pkt)
 682 {
 683         u16 peer_id = pkt->getPeerId();
 684         u16 peer_proto_ver = getClient(peer_id, CS_InitDone)->net_proto_version;
 685
 686         // clients <= protocol version 22 did not send ready message,
 687         // they're already initialized
 688         if (peer_proto_ver <= 22) {
 689                 infostream << "Client sent message not expected by a "
 690                         << "client using protocol version <= 22,"
 691                         << "disconnecting peer_id: " << peer_id << std::endl;
 692                 m_con.DisconnectPeer(peer_id);
 693                 return;
 694         }
 695
 696         PlayerSAO* playersao = StageTwoClientInit(peer_id);
 697
 698         if (playersao == NULL) {
 699                 actionstream
 700                         << "TOSERVER_CLIENT_READY stage 2 client init failed for peer_id: "
 701                         << peer_id << std::endl;
 702                 m_con.DisconnectPeer(peer_id);
 703                 return;
 704         }
 705
 706
 707         if (pkt->getSize() < 8) {
 708                 errorstream
 709                         << "TOSERVER_CLIENT_READY client sent inconsistent data, disconnecting peer_id: "
 710                         << peer_id << std::endl;
 711                 m_con.DisconnectPeer(peer_id);
 712                 return;
 713         }
 714
 715         u8 major_ver, minor_ver, patch_ver, reserved;
 716         std::string full_ver;
 717         *pkt >> major_ver >> minor_ver >> patch_ver >> reserved >> full_ver;
 718
 719         m_clients.setClientVersion(
 720                         peer_id, major_ver, minor_ver, patch_ver,
 721                         full_ver);
 722
 723         m_clients.event(peer_id, CSE_SetClientReady);
 724         m_script->on_joinplayer(playersao);
 725         // Send shutdown timer if shutdown has been scheduled
 726         if (m_shutdown_timer > 0.0f) {
 727                 std::wstringstream ws;
 728                 ws << L"*** Server shutting down in "
 729                                 << duration_to_string(myround(m_shutdown_timer)).c_str() << ".";
 730                 SendChatMessage(pkt->getPeerId(), ws.str());
 731         }
 732 }
 733
 734 void Server::handleCommand_GotBlocks(NetworkPacket* pkt)
 735 {
 736         if (pkt->getSize() < 1)
 737                 return;
 738
 739         /*
 740                 [0] u16 command
 741                 [2] u8 count
 742                 [3] v3s16 pos_0
 743                 [3+6] v3s16 pos_1
 744                 ...
 745         */
 746
 747         u8 count;
 748         *pkt >> count;
 749
 750         RemoteClient *client = getClient(pkt->getPeerId());
 751
 752         if ((s16)pkt->getSize() < 1 + (int)count * 6) {
 753                 throw con::InvalidIncomingDataException
 754                                 ("GOTBLOCKS length is too short");
 755         }
 756
 757         for (u16 i = 0; i < count; i++) {
 758                 v3s16 p;
 759                 *pkt >> p;
 760                 client->GotBlock(p);
 761         }
 762 }
 763
 764 void Server::process_PlayerPos(RemotePlayer *player, PlayerSAO *playersao,
 765         NetworkPacket *pkt)
 766 {
 767         if (pkt->getRemainingBytes() < 12 + 12 + 4 + 4)
 768                 return;
 769
 770         v3s32 ps, ss;
 771         s32 f32pitch, f32yaw;
 772         u8 f32fov;
 773
 774         *pkt >> ps;
 775         *pkt >> ss;
 776         *pkt >> f32pitch;
 777         *pkt >> f32yaw;
 778
 779         f32 pitch = (f32)f32pitch / 100.0;
 780         f32 yaw = (f32)f32yaw / 100.0;
 781         u32 keyPressed = 0;
 782
 783         // default behavior (in case an old client doesn't send these)
 784         f32 fov = 0;
 785         u8 wanted_range = 0;
 786
 787         if (pkt->getRemainingBytes() >= 4)
 788                 *pkt >> keyPressed;
 789         if (pkt->getRemainingBytes() >= 1) {
 790                 *pkt >> f32fov;
 791                 fov = (f32)f32fov / 80.0;
 792         }
 793         if (pkt->getRemainingBytes() >= 1)
 794                 *pkt >> wanted_range;
 795
 796         v3f position((f32)ps.X / 100.0, (f32)ps.Y / 100.0, (f32)ps.Z / 100.0);
 797         v3f speed((f32)ss.X / 100.0, (f32)ss.Y / 100.0, (f32)ss.Z / 100.0);
 798
 799         pitch = modulo360f(pitch);
 800         yaw = wrapDegrees_0_360(yaw);
 801
 802         playersao->setBasePosition(position);
 803         player->setSpeed(speed);
 804         playersao->setPitch(pitch);
 805         playersao->setYaw(yaw);
 806         playersao->setFov(fov);
 807         playersao->setWantedRange(wanted_range);
 808         player->keyPressed = keyPressed;
 809         player->control.up = (keyPressed & 1);
 810         player->control.down = (keyPressed & 2);
 811         player->control.left = (keyPressed & 4);
 812         player->control.right = (keyPressed & 8);
 813         player->control.jump = (keyPressed & 16);
 814         player->control.aux1 = (keyPressed & 32);
 815         player->control.sneak = (keyPressed & 64);
 816         player->control.LMB = (keyPressed & 128);
 817         player->control.RMB = (keyPressed & 256);
 818
 819         if (playersao->checkMovementCheat()) {
 820                 // Call callbacks
 821                 m_script->on_cheat(playersao, "moved_too_fast");
 822                 SendMovePlayer(pkt->getPeerId());
 823         }
 824 }
 825
 826 void Server::handleCommand_PlayerPos(NetworkPacket* pkt)
 827 {
 828         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
 829         if (player == NULL) {
 830                 errorstream << "Server::ProcessData(): Canceling: "
 831                                 "No player for peer_id=" << pkt->getPeerId()
 832                                 << " disconnecting peer!" << std::endl;
 833                 m_con.DisconnectPeer(pkt->getPeerId());
 834                 return;
 835         }
 836
 837         PlayerSAO *playersao = player->getPlayerSAO();
 838         if (playersao == NULL) {
 839                 errorstream << "Server::ProcessData(): Canceling: "
 840                                 "No player object for peer_id=" << pkt->getPeerId()
 841                                 << " disconnecting peer!" << std::endl;
 842                 m_con.DisconnectPeer(pkt->getPeerId());
 843                 return;
 844         }
 845
 846         // If player is dead we don't care of this packet
 847         if (playersao->isDead()) {
 848                 verbosestream << "TOSERVER_PLAYERPOS: " << player->getName()
 849                                 << " is dead. Ignoring packet";
 850                 return;
 851         }
 852
 853         process_PlayerPos(player, playersao, pkt);
 854 }
 855
 856 void Server::handleCommand_DeletedBlocks(NetworkPacket* pkt)
 857 {
 858         if (pkt->getSize() < 1)
 859                 return;
 860
 861         /*
 862                 [0] u16 command
 863                 [2] u8 count
 864                 [3] v3s16 pos_0
 865                 [3+6] v3s16 pos_1
 866                 ...
 867         */
 868
 869         u8 count;
 870         *pkt >> count;
 871
 872         RemoteClient *client = getClient(pkt->getPeerId());
 873
 874         if ((s16)pkt->getSize() < 1 + (int)count * 6) {
 875                 throw con::InvalidIncomingDataException
 876                                 ("DELETEDBLOCKS length is too short");
 877         }
 878
 879         for (u16 i = 0; i < count; i++) {
 880                 v3s16 p;
 881                 *pkt >> p;
 882                 client->SetBlockNotSent(p);
 883         }
 884 }
 885
 886 void Server::handleCommand_InventoryAction(NetworkPacket* pkt)
 887 {
 888         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
 889
 890         if (player == NULL) {
 891                 errorstream << "Server::ProcessData(): Canceling: "
 892                                 "No player for peer_id=" << pkt->getPeerId()
 893                                 << " disconnecting peer!" << std::endl;
 894                 m_con.DisconnectPeer(pkt->getPeerId());
 895                 return;
 896         }
 897
 898         PlayerSAO *playersao = player->getPlayerSAO();
 899         if (playersao == NULL) {
 900                 errorstream << "Server::ProcessData(): Canceling: "
 901                                 "No player object for peer_id=" << pkt->getPeerId()
 902                                 << " disconnecting peer!" << std::endl;
 903                 m_con.DisconnectPeer(pkt->getPeerId());
 904                 return;
 905         }
 906
 907         // Strip command and create a stream
 908         std::string datastring(pkt->getString(0), pkt->getSize());
 909         verbosestream << "TOSERVER_INVENTORY_ACTION: data=" << datastring
 910                 << std::endl;
 911         std::istringstream is(datastring, std::ios_base::binary);
 912         // Create an action
 913         InventoryAction *a = InventoryAction::deSerialize(is);
 914         if (a == NULL) {
 915                 infostream << "TOSERVER_INVENTORY_ACTION: "
 916                                 << "InventoryAction::deSerialize() returned NULL"
 917                                 << std::endl;
 918                 return;
 919         }
 920
 921         // If something goes wrong, this player is to blame
 922         RollbackScopeActor rollback_scope(m_rollback,
 923                         std::string("player:")+player->getName());
 924
 925         /*
 926                 Note: Always set inventory not sent, to repair cases
 927                 where the client made a bad prediction.
 928         */
 929
 930         /*
 931                 Handle restrictions and special cases of the move action
 932         */
 933         if (a->getType() == IACTION_MOVE) {
 934                 IMoveAction *ma = (IMoveAction*)a;
 935
 936                 ma->from_inv.applyCurrentPlayer(player->getName());
 937                 ma->to_inv.applyCurrentPlayer(player->getName());
 938
 939                 setInventoryModified(ma->from_inv, false);
 940                 setInventoryModified(ma->to_inv, false);
 941
 942                 bool from_inv_is_current_player =
 943                         (ma->from_inv.type == InventoryLocation::PLAYER) &&
 944                         (ma->from_inv.name == player->getName());
 945
 946                 bool to_inv_is_current_player =
 947                         (ma->to_inv.type == InventoryLocation::PLAYER) &&
 948                         (ma->to_inv.name == player->getName());
 949
 950                 /*
 951                         Disable moving items out of craftpreview
 952                 */
 953                 if (ma->from_list == "craftpreview") {
 954                         infostream << "Ignoring IMoveAction from "
 955                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 956                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 957                                         << " because src is " << ma->from_list << std::endl;
 958                         delete a;
 959                         return;
 960                 }
 961
 962                 /*
 963                         Disable moving items into craftresult and craftpreview
 964                 */
 965                 if (ma->to_list == "craftpreview" || ma->to_list == "craftresult") {
 966                         infostream << "Ignoring IMoveAction from "
 967                                         << (ma->from_inv.dump()) << ":" << ma->from_list
 968                                         << " to " << (ma->to_inv.dump()) << ":" << ma->to_list
 969                                         << " because dst is " << ma->to_list << std::endl;
 970                         delete a;
 971                         return;
 972                 }
 973
 974                 // Disallow moving items in elsewhere than player's inventory
 975                 // if not allowed to interact
 976                 if (!checkPriv(player->getName(), "interact") &&
 977                                 (!from_inv_is_current_player ||
 978                                 !to_inv_is_current_player)) {
 979                         infostream << "Cannot move outside of player's inventory: "
 980                                         << "No interact privilege" << std::endl;
 981                         delete a;
 982                         return;
 983                 }
 984         }
 985         /*
 986                 Handle restrictions and special cases of the drop action
 987         */
 988         else if (a->getType() == IACTION_DROP) {
 989                 IDropAction *da = (IDropAction*)a;
 990
 991                 da->from_inv.applyCurrentPlayer(player->getName());
 992
 993                 setInventoryModified(da->from_inv, false);
 994
 995                 /*
 996                         Disable dropping items out of craftpreview
 997                 */
 998                 if (da->from_list == "craftpreview") {
 999                         infostream << "Ignoring IDropAction from "
1000                                         << (da->from_inv.dump()) << ":" << da->from_list
1001                                         << " because src is " << da->from_list << std::endl;
1002                         delete a;
1003                         return;
1004                 }
1005
1006                 // Disallow dropping items if not allowed to interact
1007                 if (!checkPriv(player->getName(), "interact")) {
1008                         delete a;
1009                         return;
1010                 }
1011
1012                 // Disallow dropping items if dead
1013                 if (playersao->isDead()) {
1014                         infostream << "Ignoring IDropAction from "
1015                                         << (da->from_inv.dump()) << ":" << da->from_list
1016                                         << " because player is dead." << std::endl;
1017                         delete a;
1018                         return;
1019                 }
1020         }
1021         /*
1022                 Handle restrictions and special cases of the craft action
1023         */
1024         else if (a->getType() == IACTION_CRAFT) {
1025                 ICraftAction *ca = (ICraftAction*)a;
1026
1027                 ca->craft_inv.applyCurrentPlayer(player->getName());
1028
1029                 setInventoryModified(ca->craft_inv, false);
1030
1031                 //bool craft_inv_is_current_player =
1032                 //      (ca->craft_inv.type == InventoryLocation::PLAYER) &&
1033                 //      (ca->craft_inv.name == player->getName());
1034
1035                 // Disallow crafting if not allowed to interact
1036                 if (!checkPriv(player->getName(), "interact")) {
1037                         infostream << "Cannot craft: "
1038                                         << "No interact privilege" << std::endl;
1039                         delete a;
1040                         return;
1041                 }
1042         }
1043
1044         // Do the action
1045         a->apply(this, playersao, this);
1046         // Eat the action
1047         delete a;
1048
1049         SendInventory(playersao);
1050 }
1051
1052 void Server::handleCommand_ChatMessage(NetworkPacket* pkt)
1053 {
1054         /*
1055                 u16 command
1056                 u16 length
1057                 wstring message
1058         */
1059         u16 len;
1060         *pkt >> len;
1061
1062         std::wstring message;
1063         for (u16 i = 0; i < len; i++) {
1064                 u16 tmp_wchar;
1065                 *pkt >> tmp_wchar;
1066
1067                 message += (wchar_t)tmp_wchar;
1068         }
1069
1070         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1071         if (player == NULL) {
1072                 errorstream << "Server::ProcessData(): Canceling: "
1073                                 "No player for peer_id=" << pkt->getPeerId()
1074                                 << " disconnecting peer!" << std::endl;
1075                 m_con.DisconnectPeer(pkt->getPeerId());
1076                 return;
1077         }
1078
1079         // Get player name of this client
1080         std::string name = player->getName();
1081         std::wstring wname = narrow_to_wide(name);
1082
1083         std::wstring answer_to_sender = handleChat(name, wname, message,
1084                 true, dynamic_cast<RemotePlayer *>(player));
1085         if (!answer_to_sender.empty()) {
1086                 // Send the answer to sender
1087                 SendChatMessage(pkt->getPeerId(), answer_to_sender);
1088         }
1089 }
1090
1091 void Server::handleCommand_Damage(NetworkPacket* pkt)
1092 {
1093         u8 damage;
1094
1095         *pkt >> damage;
1096
1097         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1098
1099         if (player == NULL) {
1100                 errorstream << "Server::ProcessData(): Canceling: "
1101                                 "No player for peer_id=" << pkt->getPeerId()
1102                                 << " disconnecting peer!" << std::endl;
1103                 m_con.DisconnectPeer(pkt->getPeerId());
1104                 return;
1105         }
1106
1107         PlayerSAO *playersao = player->getPlayerSAO();
1108         if (playersao == NULL) {
1109                 errorstream << "Server::ProcessData(): Canceling: "
1110                                 "No player object for peer_id=" << pkt->getPeerId()
1111                                 << " disconnecting peer!" << std::endl;
1112                 m_con.DisconnectPeer(pkt->getPeerId());
1113                 return;
1114         }
1115
1116         if (g_settings->getBool("enable_damage")) {
1117                 if (playersao->isDead()) {
1118                         verbosestream << "Server::ProcessData(): Info: "
1119                                 "Ignoring damage as player " << player->getName()
1120                                 << " is already dead." << std::endl;
1121                         return;
1122                 }
1123
1124                 actionstream << player->getName() << " damaged by "
1125                                 << (int)damage << " hp at " << PP(playersao->getBasePosition() / BS)
1126                                 << std::endl;
1127
1128                 playersao->setHP(playersao->getHP() - damage);
1129                 SendPlayerHPOrDie(playersao);
1130         }
1131 }
1132
1133 void Server::handleCommand_Password(NetworkPacket* pkt)
1134 {
1135         if (pkt->getSize() != PASSWORD_SIZE * 2)
1136                 return;
1137
1138         std::string oldpwd;
1139         std::string newpwd;
1140
1141         // Deny for clients using the new protocol
1142         RemoteClient* client = getClient(pkt->getPeerId(), CS_Created);
1143         if (client->net_proto_version >= 25) {
1144                 infostream << "Server::handleCommand_Password(): Denying change: "
1145                         << " Client protocol version for peer_id=" << pkt->getPeerId()
1146                         << " too new!" << std::endl;
1147                 return;
1148         }
1149
1150         for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
1151                 char c = pkt->getChar(i);
1152                 if (c == 0)
1153                         break;
1154                 oldpwd += c;
1155         }
1156
1157         for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) {
1158                 char c = pkt->getChar(PASSWORD_SIZE + i);
1159                 if (c == 0)
1160                         break;
1161                 newpwd += c;
1162         }
1163
1164         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1165         if (player == NULL) {
1166                 errorstream << "Server::ProcessData(): Canceling: "
1167                                 "No player for peer_id=" << pkt->getPeerId()
1168                                 << " disconnecting peer!" << std::endl;
1169                 m_con.DisconnectPeer(pkt->getPeerId());
1170                 return;
1171         }
1172
1173         if (!base64_is_valid(newpwd)) {
1174                 infostream<<"Server: " << player->getName() <<
1175                                 " supplied invalid password hash" << std::endl;
1176                 // Wrong old password supplied!!
1177                 SendChatMessage(pkt->getPeerId(), L"Invalid new password hash supplied. Password NOT changed.");
1178                 return;
1179         }
1180
1181         infostream << "Server: Client requests a password change from "
1182                         << "'" << oldpwd << "' to '" << newpwd << "'" << std::endl;
1183
1184         std::string playername = player->getName();
1185
1186         std::string checkpwd;
1187         m_script->getAuth(playername, &checkpwd, NULL);
1188
1189         if (oldpwd != checkpwd) {
1190                 infostream << "Server: invalid old password" << std::endl;
1191                 // Wrong old password supplied!!
1192                 SendChatMessage(pkt->getPeerId(), L"Invalid old password supplied. Password NOT changed.");
1193                 return;
1194         }
1195
1196         bool success = m_script->setPassword(playername, newpwd);
1197         if (success) {
1198                 actionstream << player->getName() << " changes password" << std::endl;
1199                 SendChatMessage(pkt->getPeerId(), L"Password change successful.");
1200         } else {
1201                 actionstream << player->getName() << " tries to change password but "
1202                                 << "it fails" << std::endl;
1203                 SendChatMessage(pkt->getPeerId(), L"Password change failed or unavailable.");
1204         }
1205 }
1206
1207 void Server::handleCommand_PlayerItem(NetworkPacket* pkt)
1208 {
1209         if (pkt->getSize() < 2)
1210                 return;
1211
1212         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1213
1214         if (player == NULL) {
1215                 errorstream << "Server::ProcessData(): Canceling: "
1216                                 "No player for peer_id=" << pkt->getPeerId()
1217                                 << " disconnecting peer!" << std::endl;
1218                 m_con.DisconnectPeer(pkt->getPeerId());
1219                 return;
1220         }
1221
1222         PlayerSAO *playersao = player->getPlayerSAO();
1223         if (playersao == NULL) {
1224                 errorstream << "Server::ProcessData(): Canceling: "
1225                                 "No player object for peer_id=" << pkt->getPeerId()
1226                                 << " disconnecting peer!" << std::endl;
1227                 m_con.DisconnectPeer(pkt->getPeerId());
1228                 return;
1229         }
1230
1231         u16 item;
1232
1233         *pkt >> item;
1234
1235         playersao->setWieldIndex(item);
1236 }
1237
1238 void Server::handleCommand_Respawn(NetworkPacket* pkt)
1239 {
1240         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1241         if (player == NULL) {
1242                 errorstream << "Server::ProcessData(): Canceling: "
1243                                 "No player for peer_id=" << pkt->getPeerId()
1244                                 << " disconnecting peer!" << std::endl;
1245                 m_con.DisconnectPeer(pkt->getPeerId());
1246                 return;
1247         }
1248
1249         PlayerSAO *playersao = player->getPlayerSAO();
1250         assert(playersao);
1251
1252         if (!playersao->isDead())
1253                 return;
1254
1255         RespawnPlayer(pkt->getPeerId());
1256
1257         actionstream << player->getName() << " respawns at "
1258                         << PP(playersao->getBasePosition() / BS) << std::endl;
1259
1260         // ActiveObject is added to environment in AsyncRunStep after
1261         // the previous addition has been successfully removed
1262 }
1263
1264 void Server::handleCommand_Interact(NetworkPacket* pkt)
1265 {
1266         /*
1267                 [0] u16 command
1268                 [2] u8 action
1269                 [3] u16 item
1270                 [5] u32 length of the next item (plen)
1271                 [9] serialized PointedThing
1272                 [9 + plen] player position information
1273                 actions:
1274                 0: start digging (from undersurface) or use
1275                 1: stop digging (all parameters ignored)
1276                 2: digging completed
1277                 3: place block or item (to abovesurface)
1278                 4: use item
1279                 5: rightclick air ("activate")
1280         */
1281         u8 action;
1282         u16 item_i;
1283         *pkt >> action;
1284         *pkt >> item_i;
1285         std::istringstream tmp_is(pkt->readLongString(), std::ios::binary);
1286         PointedThing pointed;
1287         pointed.deSerialize(tmp_is);
1288
1289         verbosestream << "TOSERVER_INTERACT: action=" << (int)action << ", item="
1290                         << item_i << ", pointed=" << pointed.dump() << std::endl;
1291
1292         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1293
1294         if (player == NULL) {
1295                 errorstream << "Server::ProcessData(): Canceling: "
1296                                 "No player for peer_id=" << pkt->getPeerId()
1297                                 << " disconnecting peer!" << std::endl;
1298                 m_con.DisconnectPeer(pkt->getPeerId());
1299                 return;
1300         }
1301
1302         PlayerSAO *playersao = player->getPlayerSAO();
1303         if (playersao == NULL) {
1304                 errorstream << "Server::ProcessData(): Canceling: "
1305                                 "No player object for peer_id=" << pkt->getPeerId()
1306                                 << " disconnecting peer!" << std::endl;
1307                 m_con.DisconnectPeer(pkt->getPeerId());
1308                 return;
1309         }
1310
1311         if (playersao->isDead()) {
1312                 actionstream << "Server: NoCheat: " << player->getName()
1313                                 << " tried to interact while dead; ignoring." << std::endl;
1314                 if (pointed.type == POINTEDTHING_NODE) {
1315                         // Re-send block to revert change on client-side
1316                         RemoteClient *client = getClient(pkt->getPeerId());
1317                         v3s16 blockpos = getNodeBlockPos(pointed.node_undersurface);
1318                         client->SetBlockNotSent(blockpos);
1319                 }
1320                 // Call callbacks
1321                 m_script->on_cheat(playersao, "interacted_while_dead");
1322                 return;
1323         }
1324
1325         process_PlayerPos(player, playersao, pkt);
1326
1327         v3f player_pos = playersao->getLastGoodPosition();
1328
1329         // Update wielded item
1330         playersao->setWieldIndex(item_i);
1331
1332         // Get pointed to node (undefined if not POINTEDTYPE_NODE)
1333         v3s16 p_under = pointed.node_undersurface;
1334         v3s16 p_above = pointed.node_abovesurface;
1335
1336         // Get pointed to object (NULL if not POINTEDTYPE_OBJECT)
1337         ServerActiveObject *pointed_object = NULL;
1338         if (pointed.type == POINTEDTHING_OBJECT) {
1339                 pointed_object = m_env->getActiveObject(pointed.object_id);
1340                 if (pointed_object == NULL) {
1341                         verbosestream << "TOSERVER_INTERACT: "
1342                                 "pointed object is NULL" << std::endl;
1343                         return;
1344                 }
1345
1346         }
1347
1348         v3f pointed_pos_under = player_pos;
1349         v3f pointed_pos_above = player_pos;
1350         if (pointed.type == POINTEDTHING_NODE) {
1351                 pointed_pos_under = intToFloat(p_under, BS);
1352                 pointed_pos_above = intToFloat(p_above, BS);
1353         }
1354         else if (pointed.type == POINTEDTHING_OBJECT) {
1355                 pointed_pos_under = pointed_object->getBasePosition();
1356                 pointed_pos_above = pointed_pos_under;
1357         }
1358
1359         /*
1360                 Make sure the player is allowed to do it
1361         */
1362         if (!checkPriv(player->getName(), "interact")) {
1363                 actionstream<<player->getName()<<" attempted to interact with "
1364                                 <<pointed.dump()<<" without 'interact' privilege"
1365                                 <<std::endl;
1366                 // Re-send block to revert change on client-side
1367                 RemoteClient *client = getClient(pkt->getPeerId());
1368                 // Digging completed -> under
1369                 if (action == 2) {
1370                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1371                         client->SetBlockNotSent(blockpos);
1372                 }
1373                 // Placement -> above
1374                 if (action == 3) {
1375                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
1376                         client->SetBlockNotSent(blockpos);
1377                 }
1378                 return;
1379         }
1380
1381         /*
1382                 Check that target is reasonably close
1383                 (only when digging or placing things)
1384         */
1385         static const bool enable_anticheat = !g_settings->getBool("disable_anticheat");
1386         if ((action == 0 || action == 2 || action == 3 || action == 4) &&
1387                         (enable_anticheat && !isSingleplayer())) {
1388                 float d = player_pos.getDistanceFrom(pointed_pos_under);
1389                 const ItemDefinition &playeritem_def =
1390                         playersao->getWieldedItem().getDefinition(m_itemdef);
1391                 float max_d = BS * playeritem_def.range;
1392                 InventoryList *hlist = playersao->getInventory()->getList("hand");
1393                 const ItemDefinition &hand_def =
1394                         hlist ? (hlist->getItem(0).getDefinition(m_itemdef)) : (m_itemdef->get(""));
1395                 float max_d_hand = BS * hand_def.range;
1396                 if (max_d < 0 && max_d_hand >= 0)
1397                         max_d = max_d_hand;
1398                 else if (max_d < 0)
1399                         max_d = BS * 4.0;
1400                 // cube diagonal: sqrt(3) = 1.73
1401                 if (d > max_d * 1.73) {
1402                         actionstream << "Player " << player->getName()
1403                                         << " tried to access " << pointed.dump()
1404                                         << " from too far: "
1405                                         << "d=" << d <<", max_d=" << max_d
1406                                         << ". ignoring." << std::endl;
1407                         // Re-send block to revert change on client-side
1408                         RemoteClient *client = getClient(pkt->getPeerId());
1409                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1410                         client->SetBlockNotSent(blockpos);
1411                         // Call callbacks
1412                         m_script->on_cheat(playersao, "interacted_too_far");
1413                         // Do nothing else
1414                         return;
1415                 }
1416         }
1417
1418         /*
1419                 If something goes wrong, this player is to blame
1420         */
1421         RollbackScopeActor rollback_scope(m_rollback,
1422                         std::string("player:")+player->getName());
1423
1424         /*
1425                 0: start digging or punch object
1426         */
1427         if (action == 0) {
1428                 if (pointed.type == POINTEDTHING_NODE) {
1429                         MapNode n(CONTENT_IGNORE);
1430                         bool pos_ok;
1431
1432                         n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1433                         if (!pos_ok) {
1434                                 infostream << "Server: Not punching: Node not found."
1435                                                 << " Adding block to emerge queue."
1436                                                 << std::endl;
1437                                 m_emerge->enqueueBlockEmerge(pkt->getPeerId(),
1438                                         getNodeBlockPos(p_above), false);
1439                         }
1440
1441                         if (n.getContent() != CONTENT_IGNORE)
1442                                 m_script->node_on_punch(p_under, n, playersao, pointed);
1443
1444                         // Cheat prevention
1445                         playersao->noCheatDigStart(p_under);
1446                 }
1447                 else if (pointed.type == POINTEDTHING_OBJECT) {
1448                         // Skip if object has been removed
1449                         if (pointed_object->m_removed)
1450                                 return;
1451
1452                         actionstream<<player->getName()<<" punches object "
1453                                         <<pointed.object_id<<": "
1454                                         <<pointed_object->getDescription()<<std::endl;
1455
1456                         ItemStack punchitem = playersao->getWieldedItemOrHand();
1457                         ToolCapabilities toolcap =
1458                                         punchitem.getToolCapabilities(m_itemdef);
1459                         v3f dir = (pointed_object->getBasePosition() -
1460                                         (playersao->getBasePosition() + playersao->getEyeOffset())
1461                                                 ).normalize();
1462                         float time_from_last_punch =
1463                                 playersao->resetTimeFromLastPunch();
1464
1465                         s16 src_original_hp = pointed_object->getHP();
1466                         s16 dst_origin_hp = playersao->getHP();
1467
1468                         pointed_object->punch(dir, &toolcap, playersao,
1469                                         time_from_last_punch);
1470
1471                         // If the object is a player and its HP changed
1472                         if (src_original_hp != pointed_object->getHP() &&
1473                                         pointed_object->getType() == ACTIVEOBJECT_TYPE_PLAYER) {
1474                                 SendPlayerHPOrDie((PlayerSAO *)pointed_object);
1475                         }
1476
1477                         // If the puncher is a player and its HP changed
1478                         if (dst_origin_hp != playersao->getHP())
1479                                 SendPlayerHPOrDie(playersao);
1480                 }
1481
1482         } // action == 0
1483
1484         /*
1485                 1: stop digging
1486         */
1487         else if (action == 1) {
1488         } // action == 1
1489
1490         /*
1491                 2: Digging completed
1492         */
1493         else if (action == 2) {
1494                 // Only digging of nodes
1495                 if (pointed.type == POINTEDTHING_NODE) {
1496                         bool pos_ok;
1497                         MapNode n = m_env->getMap().getNodeNoEx(p_under, &pos_ok);
1498                         if (!pos_ok) {
1499                                 infostream << "Server: Not finishing digging: Node not found."
1500                                                 << " Adding block to emerge queue."
1501                                                 << std::endl;
1502                                 m_emerge->enqueueBlockEmerge(pkt->getPeerId(),
1503                                         getNodeBlockPos(p_above), false);
1504                         }
1505
1506                         /* Cheat prevention */
1507                         bool is_valid_dig = true;
1508                         if (enable_anticheat && !isSingleplayer()) {
1509                                 v3s16 nocheat_p = playersao->getNoCheatDigPos();
1510                                 float nocheat_t = playersao->getNoCheatDigTime();
1511                                 playersao->noCheatDigEnd();
1512                                 // If player didn't start digging this, ignore dig
1513                                 if (nocheat_p != p_under) {
1514                                         infostream << "Server: NoCheat: " << player->getName()
1515                                                         << " started digging "
1516                                                         << PP(nocheat_p) << " and completed digging "
1517                                                         << PP(p_under) << "; not digging." << std::endl;
1518                                         is_valid_dig = false;
1519                                         // Call callbacks
1520                                         m_script->on_cheat(playersao, "finished_unknown_dig");
1521                                 }
1522                                 // Get player's wielded item
1523                                 ItemStack playeritem = playersao->getWieldedItemOrHand();
1524                                 ToolCapabilities playeritem_toolcap =
1525                                                 playeritem.getToolCapabilities(m_itemdef);
1526                                 // Get diggability and expected digging time
1527                                 DigParams params = getDigParams(m_nodedef->get(n).groups,
1528                                                 &playeritem_toolcap);
1529                                 // If can't dig, try hand
1530                                 if (!params.diggable) {
1531                                         InventoryList *hlist = playersao->getInventory()->getList("hand");
1532                                         const ItemDefinition &hand =
1533                                                 hlist ? hlist->getItem(0).getDefinition(m_itemdef) : m_itemdef->get("");
1534                                         const ToolCapabilities *tp = hand.tool_capabilities;
1535                                         if (tp)
1536                                                 params = getDigParams(m_nodedef->get(n).groups, tp);
1537                                 }
1538                                 // If can't dig, ignore dig
1539                                 if (!params.diggable) {
1540                                         infostream << "Server: NoCheat: " << player->getName()
1541                                                         << " completed digging " << PP(p_under)
1542                                                         << ", which is not diggable with tool. not digging."
1543                                                         << std::endl;
1544                                         is_valid_dig = false;
1545                                         // Call callbacks
1546                                         m_script->on_cheat(playersao, "dug_unbreakable");
1547                                 }
1548                                 // Check digging time
1549                                 // If already invalidated, we don't have to
1550                                 if (!is_valid_dig) {
1551                                         // Well not our problem then
1552                                 }
1553                                 // Clean and long dig
1554                                 else if (params.time > 2.0 && nocheat_t * 1.2 > params.time) {
1555                                         // All is good, but grab time from pool; don't care if
1556                                         // it's actually available
1557                                         playersao->getDigPool().grab(params.time);
1558                                 }
1559                                 // Short or laggy dig
1560                                 // Try getting the time from pool
1561                                 else if (playersao->getDigPool().grab(params.time)) {
1562                                         // All is good
1563                                 }
1564                                 // Dig not possible
1565                                 else {
1566                                         infostream << "Server: NoCheat: " << player->getName()
1567                                                         << " completed digging " << PP(p_under)
1568                                                         << "too fast; not digging." << std::endl;
1569                                         is_valid_dig = false;
1570                                         // Call callbacks
1571                                         m_script->on_cheat(playersao, "dug_too_fast");
1572                                 }
1573                         }
1574
1575                         /* Actually dig node */
1576
1577                         if (is_valid_dig && n.getContent() != CONTENT_IGNORE)
1578                                 m_script->node_on_dig(p_under, n, playersao);
1579
1580                         v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1581                         RemoteClient *client = getClient(pkt->getPeerId());
1582                         // Send unusual result (that is, node not being removed)
1583                         if (m_env->getMap().getNodeNoEx(p_under).getContent() != CONTENT_AIR) {
1584                                 // Re-send block to revert change on client-side
1585                                 client->SetBlockNotSent(blockpos);
1586                         }
1587                         else {
1588                                 client->ResendBlockIfOnWire(blockpos);
1589                         }
1590                 }
1591         } // action == 2
1592
1593         /*
1594                 3: place block or right-click object
1595         */
1596         else if (action == 3) {
1597                 ItemStack item = playersao->getWieldedItem();
1598
1599                 // Reset build time counter
1600                 if (pointed.type == POINTEDTHING_NODE &&
1601                                 item.getDefinition(m_itemdef).type == ITEM_NODE)
1602                         getClient(pkt->getPeerId())->m_time_from_building = 0.0;
1603
1604                 if (pointed.type == POINTEDTHING_OBJECT) {
1605                         // Right click object
1606
1607                         // Skip if object has been removed
1608                         if (pointed_object->m_removed)
1609                                 return;
1610
1611                         actionstream << player->getName() << " right-clicks object "
1612                                         << pointed.object_id << ": "
1613                                         << pointed_object->getDescription() << std::endl;
1614
1615                         // Do stuff
1616                         pointed_object->rightClick(playersao);
1617                 }
1618                 else if (m_script->item_OnPlace(
1619                                 item, playersao, pointed)) {
1620                         // Placement was handled in lua
1621
1622                         // Apply returned ItemStack
1623                         if (playersao->setWieldedItem(item)) {
1624                                 SendInventory(playersao);
1625                         }
1626                 }
1627
1628                 // If item has node placement prediction, always send the
1629                 // blocks to make sure the client knows what exactly happened
1630                 RemoteClient *client = getClient(pkt->getPeerId());
1631                 v3s16 blockpos = getNodeBlockPos(floatToInt(pointed_pos_above, BS));
1632                 v3s16 blockpos2 = getNodeBlockPos(floatToInt(pointed_pos_under, BS));
1633                 if (item.getDefinition(m_itemdef).node_placement_prediction != "") {
1634                         client->SetBlockNotSent(blockpos);
1635                         if (blockpos2 != blockpos) {
1636                                 client->SetBlockNotSent(blockpos2);
1637                         }
1638                 }
1639                 else {
1640                         client->ResendBlockIfOnWire(blockpos);
1641                         if (blockpos2 != blockpos) {
1642                                 client->ResendBlockIfOnWire(blockpos2);
1643                         }
1644                 }
1645         } // action == 3
1646
1647         /*
1648                 4: use
1649         */
1650         else if (action == 4) {
1651                 ItemStack item = playersao->getWieldedItem();
1652
1653                 actionstream << player->getName() << " uses " << item.name
1654                                 << ", pointing at " << pointed.dump() << std::endl;
1655
1656                 if (m_script->item_OnUse(
1657                                 item, playersao, pointed)) {
1658                         // Apply returned ItemStack
1659                         if (playersao->setWieldedItem(item)) {
1660                                 SendInventory(playersao);
1661                         }
1662                 }
1663
1664         } // action == 4
1665
1666         /*
1667                 5: rightclick air
1668         */
1669         else if (action == 5) {
1670                 ItemStack item = playersao->getWieldedItem();
1671
1672                 actionstream << player->getName() << " activates "
1673                                 << item.name << std::endl;
1674
1675                 if (m_script->item_OnSecondaryUse(
1676                                 item, playersao)) {
1677                         if( playersao->setWieldedItem(item)) {
1678                                 SendInventory(playersao);
1679                         }
1680                 }
1681         }
1682
1683
1684         /*
1685                 Catch invalid actions
1686         */
1687         else {
1688                 warningstream << "Server: Invalid action "
1689                                 << action << std::endl;
1690         }
1691 }
1692
1693 void Server::handleCommand_RemovedSounds(NetworkPacket* pkt)
1694 {
1695         u16 num;
1696         *pkt >> num;
1697         for (u16 k = 0; k < num; k++) {
1698                 s32 id;
1699
1700                 *pkt >> id;
1701
1702                 UNORDERED_MAP<s32, ServerPlayingSound>::iterator i = m_playing_sounds.find(id);
1703                 if (i == m_playing_sounds.end())
1704                         continue;
1705
1706                 ServerPlayingSound &psound = i->second;
1707                 psound.clients.erase(pkt->getPeerId());
1708                 if (psound.clients.empty())
1709                         m_playing_sounds.erase(i++);
1710         }
1711 }
1712
1713 void Server::handleCommand_NodeMetaFields(NetworkPacket* pkt)
1714 {
1715         v3s16 p;
1716         std::string formname;
1717         u16 num;
1718
1719         *pkt >> p >> formname >> num;
1720
1721         StringMap fields;
1722         for (u16 k = 0; k < num; k++) {
1723                 std::string fieldname;
1724                 *pkt >> fieldname;
1725                 fields[fieldname] = pkt->readLongString();
1726         }
1727
1728         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1729
1730         if (player == NULL) {
1731                 errorstream << "Server::ProcessData(): Canceling: "
1732                                 "No player for peer_id=" << pkt->getPeerId()
1733                                 << " disconnecting peer!" << std::endl;
1734                 m_con.DisconnectPeer(pkt->getPeerId());
1735                 return;
1736         }
1737
1738         PlayerSAO *playersao = player->getPlayerSAO();
1739         if (playersao == NULL) {
1740                 errorstream << "Server::ProcessData(): Canceling: "
1741                                 "No player object for peer_id=" << pkt->getPeerId()
1742                                 << " disconnecting peer!"  << std::endl;
1743                 m_con.DisconnectPeer(pkt->getPeerId());
1744                 return;
1745         }
1746
1747         // If something goes wrong, this player is to blame
1748         RollbackScopeActor rollback_scope(m_rollback,
1749                         std::string("player:")+player->getName());
1750
1751         // Check the target node for rollback data; leave others unnoticed
1752         RollbackNode rn_old(&m_env->getMap(), p, this);
1753
1754         m_script->node_on_receive_fields(p, formname, fields, playersao);
1755
1756         // Report rollback data
1757         RollbackNode rn_new(&m_env->getMap(), p, this);
1758         if (rollback() && rn_new != rn_old) {
1759                 RollbackAction action;
1760                 action.setSetNode(p, rn_old, rn_new);
1761                 rollback()->reportAction(action);
1762         }
1763 }
1764
1765 void Server::handleCommand_InventoryFields(NetworkPacket* pkt)
1766 {
1767         std::string formname;
1768         u16 num;
1769
1770         *pkt >> formname >> num;
1771
1772         StringMap fields;
1773         for (u16 k = 0; k < num; k++) {
1774                 std::string fieldname;
1775                 *pkt >> fieldname;
1776                 fields[fieldname] = pkt->readLongString();
1777         }
1778
1779         RemotePlayer *player = m_env->getPlayer(pkt->getPeerId());
1780
1781         if (player == NULL) {
1782                 errorstream << "Server::ProcessData(): Canceling: "
1783                                 "No player for peer_id=" << pkt->getPeerId()
1784                                 << " disconnecting peer!" << std::endl;
1785                 m_con.DisconnectPeer(pkt->getPeerId());
1786                 return;
1787         }
1788
1789         PlayerSAO *playersao = player->getPlayerSAO();
1790         if (playersao == NULL) {
1791                 errorstream << "Server::ProcessData(): Canceling: "
1792                                 "No player object for peer_id=" << pkt->getPeerId()
1793                                 << " disconnecting peer!" << std::endl;
1794                 m_con.DisconnectPeer(pkt->getPeerId());
1795                 return;
1796         }
1797
1798         m_script->on_playerReceiveFields(playersao, formname, fields);
1799 }
1800
1801 void Server::handleCommand_FirstSrp(NetworkPacket* pkt)
1802 {
1803         RemoteClient* client = getClient(pkt->getPeerId(), CS_Invalid);
1804         ClientState cstate = client->getState();
1805
1806         std::string playername = client->getName();
1807
1808         std::string salt;
1809         std::string verification_key;
1810
1811         std::string addr_s = getPeerAddress(pkt->getPeerId()).serializeString();
1812         u8 is_empty;
1813
1814         *pkt >> salt >> verification_key >> is_empty;
1815
1816         verbosestream << "Server: Got TOSERVER_FIRST_SRP from " << addr_s
1817                 << ", with is_empty=" << (is_empty == 1) << std::endl;
1818
1819         // Either this packet is sent because the user is new or to change the password
1820         if (cstate == CS_HelloSent) {
1821                 if (!client->isMechAllowed(AUTH_MECHANISM_FIRST_SRP)) {
1822                         actionstream << "Server: Client from " << addr_s
1823                                         << " tried to set password without being "
1824                                         << "authenticated, or the username being new." << std::endl;
1825                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1826                         return;
1827                 }
1828
1829                 if (!isSingleplayer() &&
1830                                 g_settings->getBool("disallow_empty_password") &&
1831                                 is_empty == 1) {
1832                         actionstream << "Server: " << playername
1833                                         << " supplied empty password from " << addr_s << std::endl;
1834                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_EMPTY_PASSWORD);
1835                         return;
1836                 }
1837
1838                 std::string initial_ver_key;
1839
1840                 initial_ver_key = encode_srp_verifier(verification_key, salt);
1841                 m_script->createAuth(playername, initial_ver_key);
1842
1843                 acceptAuth(pkt->getPeerId(), false);
1844         } else {
1845                 if (cstate < CS_SudoMode) {
1846                         infostream << "Server::ProcessData(): Ignoring TOSERVER_FIRST_SRP from "
1847                                         << addr_s << ": " << "Client has wrong state " << cstate << "."
1848                                         << std::endl;
1849                         return;
1850                 }
1851                 m_clients.event(pkt->getPeerId(), CSE_SudoLeave);
1852                 std::string pw_db_field = encode_srp_verifier(verification_key, salt);
1853                 bool success = m_script->setPassword(playername, pw_db_field);
1854                 if (success) {
1855                         actionstream << playername << " changes password" << std::endl;
1856                         SendChatMessage(pkt->getPeerId(), L"Password change successful.");
1857                 } else {
1858                         actionstream << playername << " tries to change password but "
1859                                 << "it fails" << std::endl;
1860                         SendChatMessage(pkt->getPeerId(), L"Password change failed or unavailable.");
1861                 }
1862         }
1863 }
1864
1865 void Server::handleCommand_SrpBytesA(NetworkPacket* pkt)
1866 {
1867         RemoteClient* client = getClient(pkt->getPeerId(), CS_Invalid);
1868         ClientState cstate = client->getState();
1869
1870         bool wantSudo = (cstate == CS_Active);
1871
1872         if (!((cstate == CS_HelloSent) || (cstate == CS_Active))) {
1873                 actionstream << "Server: got SRP _A packet in wrong state "
1874                         << cstate << " from "
1875                         << getPeerAddress(pkt->getPeerId()).serializeString()
1876                         << ". Ignoring." << std::endl;
1877                 return;
1878         }
1879
1880         if (client->chosen_mech != AUTH_MECHANISM_NONE) {
1881                 actionstream << "Server: got SRP _A packet, while auth"
1882                         << "is already going on with mech " << client->chosen_mech
1883                         << " from " << getPeerAddress(pkt->getPeerId()).serializeString()
1884                         << " (wantSudo=" << wantSudo << "). Ignoring." << std::endl;
1885                 if (wantSudo) {
1886                         DenySudoAccess(pkt->getPeerId());
1887                         return;
1888                 } else {
1889                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1890                         return;
1891                 }
1892         }
1893
1894         std::string bytes_A;
1895         u8 based_on;
1896         *pkt >> bytes_A >> based_on;
1897
1898         infostream << "Server: TOSERVER_SRP_BYTES_A received with "
1899                 << "based_on=" << int(based_on) << " and len_A="
1900                 << bytes_A.length() << "." << std::endl;
1901
1902         AuthMechanism chosen = (based_on == 0) ?
1903                 AUTH_MECHANISM_LEGACY_PASSWORD : AUTH_MECHANISM_SRP;
1904
1905         if (wantSudo) {
1906                 if (!client->isSudoMechAllowed(chosen)) {
1907                         actionstream << "Server: Player \"" << client->getName()
1908                                 << "\" at " << getPeerAddress(pkt->getPeerId()).serializeString()
1909                                 << " tried to change password using unallowed mech "
1910                                 << chosen << "." << std::endl;
1911                         DenySudoAccess(pkt->getPeerId());
1912                         return;
1913                 }
1914         } else {
1915                 if (!client->isMechAllowed(chosen)) {
1916                         actionstream << "Server: Client tried to authenticate from "
1917                                 << getPeerAddress(pkt->getPeerId()).serializeString()
1918                                 << " using unallowed mech " << chosen << "." << std::endl;
1919                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1920                         return;
1921                 }
1922         }
1923
1924         client->chosen_mech = chosen;
1925
1926         std::string salt;
1927         std::string verifier;
1928
1929         if (based_on == 0) {
1930
1931                 generate_srp_verifier_and_salt(client->getName(), client->enc_pwd,
1932                         &verifier, &salt);
1933         } else if (!decode_srp_verifier_and_salt(client->enc_pwd, &verifier, &salt)) {
1934                 // Non-base64 errors should have been catched in the init handler
1935                 actionstream << "Server: User " << client->getName()
1936                         << " tried to log in, but srp verifier field"
1937                         << " was invalid (most likely invalid base64)." << std::endl;
1938                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
1939                 return;
1940         }
1941
1942         char *bytes_B = 0;
1943         size_t len_B = 0;
1944
1945         client->auth_data = srp_verifier_new(SRP_SHA256, SRP_NG_2048,
1946                 client->getName().c_str(),
1947                 (const unsigned char *) salt.c_str(), salt.size(),
1948                 (const unsigned char *) verifier.c_str(), verifier.size(),
1949                 (const unsigned char *) bytes_A.c_str(), bytes_A.size(),
1950                 NULL, 0,
1951                 (unsigned char **) &bytes_B, &len_B, NULL, NULL);
1952
1953         if (!bytes_B) {
1954                 actionstream << "Server: User " << client->getName()
1955                         << " tried to log in, SRP-6a safety check violated in _A handler."
1956                         << std::endl;
1957                 if (wantSudo) {
1958                         DenySudoAccess(pkt->getPeerId());
1959                         return;
1960                 } else {
1961                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1962                         return;
1963                 }
1964         }
1965
1966         NetworkPacket resp_pkt(TOCLIENT_SRP_BYTES_S_B, 0, pkt->getPeerId());
1967         resp_pkt << salt << std::string(bytes_B, len_B);
1968         Send(&resp_pkt);
1969 }
1970
1971 void Server::handleCommand_SrpBytesM(NetworkPacket* pkt)
1972 {
1973         RemoteClient* client = getClient(pkt->getPeerId(), CS_Invalid);
1974         ClientState cstate = client->getState();
1975
1976         bool wantSudo = (cstate == CS_Active);
1977
1978         verbosestream << "Server: Recieved TOCLIENT_SRP_BYTES_M." << std::endl;
1979
1980         if (!((cstate == CS_HelloSent) || (cstate == CS_Active))) {
1981                 actionstream << "Server: got SRP _M packet in wrong state "
1982                         << cstate << " from "
1983                         << getPeerAddress(pkt->getPeerId()).serializeString()
1984                         << ". Ignoring." << std::endl;
1985                 return;
1986         }
1987
1988         if ((client->chosen_mech != AUTH_MECHANISM_SRP)
1989                 && (client->chosen_mech != AUTH_MECHANISM_LEGACY_PASSWORD)) {
1990                 actionstream << "Server: got SRP _M packet, while auth"
1991                         << "is going on with mech " << client->chosen_mech
1992                         << " from " << getPeerAddress(pkt->getPeerId()).serializeString()
1993                         << " (wantSudo=" << wantSudo << "). Denying." << std::endl;
1994                 if (wantSudo) {
1995                         DenySudoAccess(pkt->getPeerId());
1996                         return;
1997                 } else {
1998                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
1999                         return;
2000                 }
2001         }
2002
2003         std::string bytes_M;
2004         *pkt >> bytes_M;
2005
2006         if (srp_verifier_get_session_key_length((SRPVerifier *) client->auth_data)
2007                         != bytes_M.size()) {
2008                 actionstream << "Server: User " << client->getName()
2009                         << " at " << getPeerAddress(pkt->getPeerId()).serializeString()
2010                         << " sent bytes_M with invalid length " << bytes_M.size() << std::endl;
2011                 DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_UNEXPECTED_DATA);
2012                 return;
2013         }
2014
2015         unsigned char *bytes_HAMK = 0;
2016
2017         srp_verifier_verify_session((SRPVerifier *) client->auth_data,
2018                 (unsigned char *)bytes_M.c_str(), &bytes_HAMK);
2019
2020         if (!bytes_HAMK) {
2021                 if (wantSudo) {
2022                         actionstream << "Server: User " << client->getName()
2023                                 << " at " << getPeerAddress(pkt->getPeerId()).serializeString()
2024                                 << " tried to change their password, but supplied wrong"
2025                                 << " (SRP) password for authentication." << std::endl;
2026                         DenySudoAccess(pkt->getPeerId());
2027                         return;
2028                 } else {
2029                         actionstream << "Server: User " << client->getName()
2030                                 << " at " << getPeerAddress(pkt->getPeerId()).serializeString()
2031                                 << " supplied wrong password (auth mechanism: SRP)."
2032                                 << std::endl;
2033                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_PASSWORD);
2034                         return;
2035                 }
2036         }
2037
2038         if (client->create_player_on_auth_success) {
2039                 std::string playername = client->getName();
2040                 m_script->createAuth(playername, client->enc_pwd);
2041
2042                 std::string checkpwd; // not used, but needed for passing something
2043                 if (!m_script->getAuth(playername, &checkpwd, NULL)) {
2044                         actionstream << "Server: " << playername << " cannot be authenticated"
2045                                 << " (auth handler does not work?)" << std::endl;
2046                         DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL);
2047                         return;
2048                 }
2049                 client->create_player_on_auth_success = false;
2050         }
2051
2052         acceptAuth(pkt->getPeerId(), wantSudo);
2053 }