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Limit formspec fields to 640K (#13380)
Fixes an issue where long inputs could cause issues when dealing with formspecs. The expected data is usually below 1 KiB, however that's not a technical limit.
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@ -1342,21 +1342,26 @@ void Server::handleCommand_RemovedSounds(NetworkPacket* pkt)
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}
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}
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void Server::handleCommand_NodeMetaFields(NetworkPacket* pkt)
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static bool pkt_read_formspec_fields(NetworkPacket *pkt, StringMap &fields)
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{
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v3s16 p;
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std::string formname;
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u16 num;
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u16 field_count;
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*pkt >> field_count;
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*pkt >> p >> formname >> num;
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StringMap fields;
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for (u16 k = 0; k < num; k++) {
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u64 length = 0;
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for (u16 k = 0; k < field_count; k++) {
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std::string fieldname;
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*pkt >> fieldname;
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fields[fieldname] = pkt->readLongString();
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}
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length += fieldname.size();
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length += fields[fieldname].size();
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}
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// 640K ought to be enough for anyone
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return length < 640 * 1024;
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}
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void Server::handleCommand_NodeMetaFields(NetworkPacket* pkt)
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{
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session_t peer_id = pkt->getPeerId();
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RemotePlayer *player = m_env->getPlayer(peer_id);
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@ -1377,6 +1382,18 @@ void Server::handleCommand_NodeMetaFields(NetworkPacket* pkt)
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return;
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}
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v3s16 p;
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std::string formname;
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StringMap fields;
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*pkt >> p >> formname;
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if (!pkt_read_formspec_fields(pkt, fields)) {
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warningstream << "Too large formspec fields! Ignoring for pos="
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<< PP(p) << ", player=" << player->getName() << std::endl;
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return;
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}
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// If something goes wrong, this player is to blame
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RollbackScopeActor rollback_scope(m_rollback,
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std::string("player:")+player->getName());
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@ -1397,18 +1414,6 @@ void Server::handleCommand_NodeMetaFields(NetworkPacket* pkt)
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void Server::handleCommand_InventoryFields(NetworkPacket* pkt)
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{
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std::string client_formspec_name;
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u16 num;
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*pkt >> client_formspec_name >> num;
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StringMap fields;
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for (u16 k = 0; k < num; k++) {
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std::string fieldname;
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*pkt >> fieldname;
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fields[fieldname] = pkt->readLongString();
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}
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session_t peer_id = pkt->getPeerId();
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RemotePlayer *player = m_env->getPlayer(peer_id);
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@ -1429,6 +1434,17 @@ void Server::handleCommand_InventoryFields(NetworkPacket* pkt)
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return;
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}
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std::string client_formspec_name;
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StringMap fields;
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*pkt >> client_formspec_name;
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if (!pkt_read_formspec_fields(pkt, fields)) {
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warningstream << "Too large formspec fields! Ignoring for formname=\""
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<< client_formspec_name << "\", player=" << player->getName() << std::endl;
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return;
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}
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if (client_formspec_name.empty()) { // pass through inventory submits
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m_script->on_playerReceiveFields(playersao, client_formspec_name, fields);
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return;
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