From 74d34da6cbb06a4d5659eb3287a87239c31da22c Mon Sep 17 00:00:00 2001 From: Loic Blot Date: Fri, 13 Mar 2015 16:35:21 +0100 Subject: Prepare Protocol v25 init & authentication. * TOSERVER_INIT and TOCLIENT_INIT renamed to _LEGACY * TOSERVER_PASSWORD merged from dev-0.5, can use protocol v24 and v25 * TOCLIENT_ACCESS_DENIED merged from dev-0.5, can use protocol v24 and v25, with normalized strings an a custom id for custom errors * new TOSERVER_INIT packet only send MT version, supported compressions, protocols and serialization, this permit to rework everything later without break the _INIT packet * new TOSERVER_AUTH packet which auth the client * new TOCLIENT_HELLO packet which send server serialization version atm * new TOCLIENT_AUTH_ACCEPTED which is send when TOCLIENT_AUTH was okay. After this packet, the client load datas from servers, like after TOCLIENT_INIT_LEGACY packet --- src/network/packethandlers/server.cpp | 348 ++++++++++++++++++++++++++++++---- 1 file changed, 314 insertions(+), 34 deletions(-) (limited to 'src/network/packethandlers/server.cpp') diff --git a/src/network/packethandlers/server.cpp b/src/network/packethandlers/server.cpp index 113ca6c8f..ee30dfd06 100644 --- a/src/network/packethandlers/server.cpp +++ b/src/network/packethandlers/server.cpp @@ -43,6 +43,283 @@ void Server::handleCommand_Deprecated(NetworkPacket* pkt) << " not supported anymore" << std::endl; } +void Server::handleCommand_Init(NetworkPacket* pkt) +{ + + if(pkt->getSize() < 1) + return; + + RemoteClient* client = getClient(pkt->getPeerId(), CS_Created); + + std::string addr_s; + try { + Address address = getPeerAddress(pkt->getPeerId()); + addr_s = address.serializeString(); + } + catch (con::PeerNotFoundException &e) { + /* + * no peer for this packet found + * most common reason is peer timeout, e.g. peer didn't + * respond for some time, your server was overloaded or + * things like that. + */ + infostream << "Server::ProcessData(): Canceling: peer " + << pkt->getPeerId() << " not found" << std::endl; + return; + } + + // If net_proto_version is set, this client has already been handled + if (client->getState() > CS_Created) { + verbosestream << "Server: Ignoring multiple TOSERVER_INITs from " + << addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl; + return; + } + + verbosestream << "Server: Got TOSERVER_INIT from " << addr_s << " (peer_id=" + << pkt->getPeerId() << ")" << std::endl; + + // Do not allow multiple players in simple singleplayer mode. + // This isn't a perfect way to do it, but will suffice for now + if (m_simple_singleplayer_mode && m_clients.getClientIDs().size() > 1) { + infostream << "Server: Not allowing another client (" << addr_s + << ") to connect in simple singleplayer mode" << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SINGLEPLAYER); + return; + } + + // First byte after command is maximum supported + // serialization version + u8 client_max; + u8 compression_modes; + u16 min_net_proto_version = 0; + u16 max_net_proto_version; + + *pkt >> client_max >> compression_modes >> min_net_proto_version + >> max_net_proto_version; + + u8 our_max = SER_FMT_VER_HIGHEST_READ; + // Use the highest version supported by both + int deployed = std::min(client_max, our_max); + // If it's lower than the lowest supported, give up. + if (deployed < SER_FMT_VER_LOWEST) + deployed = SER_FMT_VER_INVALID; + + if (deployed == SER_FMT_VER_INVALID) { + actionstream << "Server: A mismatched client tried to connect from " + << addr_s << std::endl; + infostream<<"Server: Cannot negotiate serialization version with " + << addr_s << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION); + return; + } + + client->setPendingSerializationVersion(deployed); + + /* + Read and check network protocol version + */ + + u16 net_proto_version = 0; + + // Figure out a working version if it is possible at all + if (max_net_proto_version >= SERVER_PROTOCOL_VERSION_MIN || + min_net_proto_version <= SERVER_PROTOCOL_VERSION_MAX) { + // If maximum is larger than our maximum, go with our maximum + if (max_net_proto_version > SERVER_PROTOCOL_VERSION_MAX) + net_proto_version = SERVER_PROTOCOL_VERSION_MAX; + // Else go with client's maximum + else + net_proto_version = max_net_proto_version; + } + + verbosestream << "Server: " << addr_s << ": Protocol version: min: " + << min_net_proto_version << ", max: " << max_net_proto_version + << ", chosen: " << net_proto_version << std::endl; + + client->net_proto_version = net_proto_version; + + // On this handler protocol version 25 is required + if (net_proto_version < 25 || + net_proto_version < SERVER_PROTOCOL_VERSION_MIN || + net_proto_version > SERVER_PROTOCOL_VERSION_MAX) { + actionstream << "Server: A mismatched client tried to connect from " + << addr_s << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION); + return; + } + + if (g_settings->getBool("strict_protocol_version_checking")) { + if (net_proto_version != LATEST_PROTOCOL_VERSION) { + actionstream << "Server: A mismatched (strict) client tried to " + << "connect from " << addr_s << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_VERSION); + return; + } + } + + // @TODO: check if we support same modes, but not required now + + client->setSupportedCompressionModes(compression_modes); + + m_clients.event(pkt->getPeerId(), CSE_Init); +} + +void Server::handleCommand_Auth(NetworkPacket* pkt) +{ + std::string addr_s; + try { + Address address = getPeerAddress(pkt->getPeerId()); + addr_s = address.serializeString(); + } + catch (con::PeerNotFoundException &e) { + /* + * no peer for this packet found + * most common reason is peer timeout, e.g. peer didn't + * respond for some time, your server was overloaded or + * things like that. + */ + infostream << "Server::ProcessData(): Canceling: peer " + << pkt->getPeerId() << " not found" << std::endl; + return; + } + + std::string playerName, playerPassword; + + *pkt >> playerName >> playerPassword; + + const char* playername = playerName.c_str(); + + if (playerName.size() > PLAYERNAME_SIZE) { + actionstream << "Server: Player with an too long name " + << "tried to connect from " << addr_s << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_NAME); + return; + } + + if (string_allowed(playerName, PLAYERNAME_ALLOWED_CHARS) == false) { + actionstream << "Server: Player with an invalid name " + << "tried to connect from " << addr_s << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_CHARS_IN_NAME); + return; + } + + if (!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0) { + actionstream << "Server: Player with the name \"singleplayer\" " + << "tried to connect from " << addr_s << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_NAME); + return; + } + + { + std::string reason; + if(m_script->on_prejoinplayer(playername, addr_s, reason)) { + actionstream << "Server: Player with the name \"" << playerName << "\" " + << "tried to connect from " << addr_s << " " + << "but it was disallowed for the following reason: " + << reason << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_CUSTOM_STRING, + narrow_to_wide(reason.c_str())); + return; + } + } + + if (playerPassword.size() > PASSWORD_SIZE) { + actionstream << "Server: Player with an too long password " + << "tried to connect from " << addr_s << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_PASSWORD); + return; + } + + infostream << "Server: New connection: \"" << playerName << "\" from " + << addr_s << " (peer_id=" << pkt->getPeerId() << ")" << std::endl; + + if(!base64_is_valid(playerPassword)){ + actionstream << "Server: " << playerName + << " supplied invalid password hash" << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_PASSWORD); + return; + } + + // Enforce user limit. + // Don't enforce for users that have some admin right + if (m_clients.getClientIDs(CS_Created).size() >= g_settings->getU16("max_users") && + !checkPriv(playername, "server") && + !checkPriv(playername, "ban") && + !checkPriv(playername, "privs") && + !checkPriv(playername, "password") && + playername != g_settings->get("name")) { + actionstream << "Server: " << playername << " tried to join, but there" + << " are already max_users=" + << g_settings->getU16("max_users") << " players." << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_TOO_MANY_USERS); + return; + } + + std::string checkpwd; // Password hash to check against + bool has_auth = m_script->getAuth(playername, &checkpwd, NULL); + + // If no authentication info exists for user, create it + if (!has_auth) { + if (!isSingleplayer() && + g_settings->getBool("disallow_empty_password") && + playerPassword.empty()) { + actionstream << "Server: " << playerName + << " supplied empty password" << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_EMPTY_PASSWORD); + return; + } + std::wstring raw_default_password = + narrow_to_wide(g_settings->get("default_password")); + std::string initial_password = + translatePassword(playername, raw_default_password); + + // If default_password is empty, allow any initial password + if (raw_default_password.length() == 0) + initial_password = playerPassword.c_str(); + + m_script->createAuth(playername, initial_password); + } + + has_auth = m_script->getAuth(playername, &checkpwd, NULL); + + if(!has_auth) { + actionstream << "Server: " << playerName << " cannot be authenticated" + << " (auth handler does not work?)" << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_SERVER_FAIL); + return; + } + + if(playerPassword.c_str() != checkpwd) { + actionstream << "Server: " << playerName << " supplied wrong password" + << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_WRONG_PASSWORD); + return; + } + + RemotePlayer *player = + static_cast(m_env->getPlayer(playername)); + + if (player && player->peer_id != 0) { + errorstream << "Server: " << playername << ": Failed to emerge player" + << " (player allocated to an another client)" << std::endl; + DenyAccess(pkt->getPeerId(), SERVER_ACCESSDENIED_ALREADY_CONNECTED); + } + + m_clients.setPlayerName(pkt->getPeerId(), playername); + + /* + Answer with a TOCLIENT_INIT + */ + + NetworkPacket resp_pkt(TOCLIENT_AUTH_ACCEPT, 1 + 6 + 8 + 4, pkt->getPeerId()); + + resp_pkt << v3f(0,0,0) << (u64) m_env->getServerMap().getSeed() + << g_settings->getFloat("dedicated_server_step"); + + Send(&resp_pkt); + m_clients.event(pkt->getPeerId(), CSE_Init); +} + void Server::handleCommand_Init_Legacy(NetworkPacket* pkt) { // [0] u8 SER_FMT_VER_HIGHEST_READ @@ -86,7 +363,7 @@ void Server::handleCommand_Init_Legacy(NetworkPacket* pkt) if (m_simple_singleplayer_mode && m_clients.getClientIDs().size() > 1) { infostream << "Server: Not allowing another client (" << addr_s << ") to connect in simple singleplayer mode" << std::endl; - DenyAccess(pkt->getPeerId(), L"Running in simple singleplayer mode."); + DenyAccess_Legacy(pkt->getPeerId(), L"Running in simple singleplayer mode."); return; } @@ -108,7 +385,7 @@ void Server::handleCommand_Init_Legacy(NetworkPacket* pkt) << addr_s << std::endl; infostream<<"Server: Cannot negotiate serialization version with " << addr_s << std::endl; - DenyAccess(pkt->getPeerId(), std::wstring( + DenyAccess_Legacy(pkt->getPeerId(), std::wstring( L"Your client's version is not supported.\n" L"Server version is ") + narrow_to_wide(minetest_version_simple) + L"." @@ -156,7 +433,7 @@ void Server::handleCommand_Init_Legacy(NetworkPacket* pkt) net_proto_version > SERVER_PROTOCOL_VERSION_MAX) { actionstream << "Server: A mismatched client tried to connect from " << addr_s << std::endl; - DenyAccess(pkt->getPeerId(), std::wstring( + DenyAccess_Legacy(pkt->getPeerId(), std::wstring( L"Your client's version is not supported.\n" L"Server version is ") + narrow_to_wide(minetest_version_simple) + L",\n" @@ -176,7 +453,7 @@ void Server::handleCommand_Init_Legacy(NetworkPacket* pkt) if (net_proto_version != LATEST_PROTOCOL_VERSION) { actionstream << "Server: A mismatched (strict) client tried to " << "connect from " << addr_s << std::endl; - DenyAccess(pkt->getPeerId(), std::wstring( + DenyAccess_Legacy(pkt->getPeerId(), std::wstring( L"Your client's version is not supported.\n" L"Server version is ") + narrow_to_wide(minetest_version_simple) + L",\n" @@ -205,7 +482,7 @@ void Server::handleCommand_Init_Legacy(NetworkPacket* pkt) if (playername_length == PLAYERNAME_SIZE) { actionstream << "Server: Player with name exceeding max length " << "tried to connect from " << addr_s << std::endl; - DenyAccess(pkt->getPeerId(), L"Name too long"); + DenyAccess_Legacy(pkt->getPeerId(), L"Name too long"); return; } @@ -213,21 +490,21 @@ void Server::handleCommand_Init_Legacy(NetworkPacket* pkt) if (playername[0]=='\0') { actionstream << "Server: Player with an empty name " << "tried to connect from " << addr_s << std::endl; - DenyAccess(pkt->getPeerId(), L"Empty name"); + DenyAccess_Legacy(pkt->getPeerId(), L"Empty name"); return; } if (string_allowed(playername, PLAYERNAME_ALLOWED_CHARS) == false) { actionstream << "Server: Player with an invalid name " << "tried to connect from " << addr_s << std::endl; - DenyAccess(pkt->getPeerId(), L"Name contains unallowed characters"); + DenyAccess_Legacy(pkt->getPeerId(), L"Name contains unallowed characters"); return; } if (!isSingleplayer() && strcasecmp(playername, "singleplayer") == 0) { actionstream << "Server: Player with the name \"singleplayer\" " << "tried to connect from " << addr_s << std::endl; - DenyAccess(pkt->getPeerId(), L"Name is not allowed"); + DenyAccess_Legacy(pkt->getPeerId(), L"Name is not allowed"); return; } @@ -238,7 +515,7 @@ void Server::handleCommand_Init_Legacy(NetworkPacket* pkt) << "tried to connect from " << addr_s << " " << "but it was disallowed for the following reason: " << reason << std::endl; - DenyAccess(pkt->getPeerId(), narrow_to_wide(reason.c_str())); + DenyAccess_Legacy(pkt->getPeerId(), narrow_to_wide(reason.c_str())); return; } } @@ -262,7 +539,7 @@ void Server::handleCommand_Init_Legacy(NetworkPacket* pkt) if (!base64_is_valid(given_password)) { actionstream << "Server: " << playername << " supplied invalid password hash" << std::endl; - DenyAccess(pkt->getPeerId(), L"Invalid password hash"); + DenyAccess_Legacy(pkt->getPeerId(), L"Invalid password hash"); return; } @@ -277,7 +554,7 @@ void Server::handleCommand_Init_Legacy(NetworkPacket* pkt) actionstream << "Server: " << playername << " tried to join, but there" << " are already max_users=" << g_settings->getU16("max_users") << " players." << std::endl; - DenyAccess(pkt->getPeerId(), L"Too many users."); + DenyAccess_Legacy(pkt->getPeerId(), L"Too many users."); return; } @@ -291,7 +568,7 @@ void Server::handleCommand_Init_Legacy(NetworkPacket* pkt) std::string(given_password) == "") { actionstream << "Server: " << playername << " supplied empty password" << std::endl; - DenyAccess(pkt->getPeerId(), L"Empty passwords are " + DenyAccess_Legacy(pkt->getPeerId(), L"Empty passwords are " L"disallowed. Set a password and try again."); return; } @@ -312,14 +589,14 @@ void Server::handleCommand_Init_Legacy(NetworkPacket* pkt) if (!has_auth) { actionstream << "Server: " << playername << " cannot be authenticated" << " (auth handler does not work?)" << std::endl; - DenyAccess(pkt->getPeerId(), L"Not allowed to login"); + DenyAccess_Legacy(pkt->getPeerId(), L"Not allowed to login"); return; } if (given_password != checkpwd) { actionstream << "Server: " << playername << " supplied wrong password" << std::endl; - DenyAccess(pkt->getPeerId(), L"Wrong password"); + DenyAccess_Legacy(pkt->getPeerId(), L"Wrong password"); return; } @@ -329,7 +606,7 @@ void Server::handleCommand_Init_Legacy(NetworkPacket* pkt) if (player && player->peer_id != 0) { errorstream << "Server: " << playername << ": Failed to emerge player" << " (player allocated to an another client)" << std::endl; - DenyAccess(pkt->getPeerId(), L"Another client is connected with this " + DenyAccess_Legacy(pkt->getPeerId(), L"Another client is connected with this " L"name. If your client closed unexpectedly, try again in " L"a minute."); } @@ -340,7 +617,7 @@ void Server::handleCommand_Init_Legacy(NetworkPacket* pkt) Answer with a TOCLIENT_INIT */ - NetworkPacket* resp_pkt = new NetworkPacket(TOCLIENT_INIT, 1 + 6 + 8 + 4, + NetworkPacket* resp_pkt = new NetworkPacket(TOCLIENT_INIT_LEGACY, 1 + 6 + 8 + 4, pkt->getPeerId()); *resp_pkt << (u8) deployed << (v3s16) floatToInt(v3f(0,0,0), BS) @@ -942,33 +1219,36 @@ void Server::handleCommand_Breath(NetworkPacket* pkt) SendPlayerBreath(pkt->getPeerId()); } -void Server::handleCommand_Password_Legacy(NetworkPacket* pkt) +void Server::handleCommand_Password(NetworkPacket* pkt) { - /* - [0] u16 TOSERVER_PASSWORD - [2] u8[28] old password - [30] u8[28] new password - */ - errorstream << "PAssword packet size: " << pkt->getSize() << " size required: " << PASSWORD_SIZE * 2 << std::endl; - if (pkt->getSize() != PASSWORD_SIZE * 2) + if ((pkt->getCommand() == TOSERVER_PASSWORD && pkt->getSize() < 4) || + pkt->getSize() != PASSWORD_SIZE * 2) return; std::string oldpwd; std::string newpwd; - for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) { - char c = pkt->getChar(i); - if (c == 0) - break; - oldpwd += c; + if (pkt->getCommand() == TOSERVER_PASSWORD) { + *pkt >> oldpwd >> newpwd; } + // 13/03/15 + // Protocol v24 compat. Please remove in 1 year after + // client convergence to 0.4.13/0.5.x + else { + for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) { + char c = pkt->getChar(i); + if (c == 0) + break; + oldpwd += c; + } - for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) { - char c = pkt->getChar(PASSWORD_SIZE + i); - if (c == 0) - break; - newpwd += c; + for (u16 i = 0; i < PASSWORD_SIZE - 1; i++) { + char c = pkt->getChar(PASSWORD_SIZE + i); + if (c == 0) + break; + newpwd += c; + } } Player *player = m_env->getPlayer(pkt->getPeerId()); -- cgit v1.2.3