diff options
Diffstat (limited to 'modules/operserv/os_defcon.cpp')
| -rw-r--r-- | modules/operserv/os_defcon.cpp | 599 |
1 files changed, 599 insertions, 0 deletions
diff --git a/modules/operserv/os_defcon.cpp b/modules/operserv/os_defcon.cpp new file mode 100644 index 000000000..b098a4775 --- /dev/null +++ b/modules/operserv/os_defcon.cpp @@ -0,0 +1,599 @@ +/* OperServ core functions + * + * (C) 2003-2024 Anope Team + * Contact us at team@anope.org + * + * Please read COPYING and README for further details. + * + * Based on the original code of Epona by Lara. + * Based on the original code of Services by Andy Church. + */ + +#include "module.h" +#include "modules/os_session.h" + +enum DefconLevel +{ + DEFCON_NO_NEW_CHANNELS, + DEFCON_NO_NEW_NICKS, + DEFCON_NO_MLOCK_CHANGE, + DEFCON_FORCE_CHAN_MODES, + DEFCON_REDUCE_SESSION, + DEFCON_NO_NEW_CLIENTS, + DEFCON_OPER_ONLY, + DEFCON_SILENT_OPER_ONLY, + DEFCON_AKILL_NEW_CLIENTS, + DEFCON_NO_NEW_MEMOS +}; + +bool DefConModesSet = false; + +struct DefconConfig final +{ + std::vector<std::bitset<32> > DefCon; + std::set<Anope::string> DefConModesOn, DefConModesOff; + std::map<Anope::string, Anope::string> DefConModesOnParams; + + int defaultlevel, sessionlimit; + Anope::string chanmodes, message, offmessage, akillreason; + std::vector<Anope::string> defcons; + time_t akillexpire, timeout; + bool globalondefcon; + + unsigned max_session_kill; + time_t session_autokill_expiry; + Anope::string sle_reason, sle_detailsloc; + + DefconConfig() + { + this->DefCon.resize(6); + this->defcons.resize(5); + } + + bool Check(DefconLevel level) + { + return this->Check(this->defaultlevel, level); + } + + bool Check(int dlevel, DefconLevel level) + { + return this->DefCon[dlevel].test(level); + } + + void Add(int dlevel, DefconLevel level) + { + this->DefCon[dlevel][level] = true; + } + + void Del(int dlevel, DefconLevel level) + { + this->DefCon[dlevel][level] = false; + } + + bool SetDefConParam(const Anope::string &name, const Anope::string &buf) + { + return DefConModesOnParams.emplace(name, buf).second; + } + + void UnsetDefConParam(const Anope::string &name) + { + DefConModesOnParams.erase(name); + } + + bool GetDefConParam(const Anope::string &name, Anope::string &buf) + { + std::map<Anope::string, Anope::string>::iterator it = DefConModesOnParams.find(name); + + buf.clear(); + + if (it != DefConModesOnParams.end()) + { + buf = it->second; + return true; + } + + return false; + } +}; + +static DefconConfig DConfig; + +static void runDefCon(); +static Anope::string defconReverseModes(const Anope::string &modes); + +static ServiceReference<GlobalService> GlobalService("GlobalService", "Global"); + +static Timer *timeout; + +class DefConTimeout final + : public Timer +{ + int level; + +public: + DefConTimeout(Module *mod, int newlevel) + : Timer(mod, DConfig.timeout) + , level(newlevel) + { + timeout = this; + } + + ~DefConTimeout() override + { + timeout = NULL; + } + + void Tick() override + { + if (DConfig.defaultlevel != level) + { + DConfig.defaultlevel = level; + FOREACH_MOD(OnDefconLevel, (level)); + Log(Config->GetClient("OperServ"), "operserv/defcon") << "Defcon level timeout, returning to level " << level; + + if (DConfig.globalondefcon) + { + if (!DConfig.offmessage.empty()) + GlobalService->SendSingle(DConfig.offmessage); + else + GlobalService->SendSingle(Anope::printf(Language::Translate(_("The Defcon level is now at: \002%d\002")), DConfig.defaultlevel)); + + if (!DConfig.message.empty()) + GlobalService->SendSingle(DConfig.message); + } + + runDefCon(); + } + } +}; + +class CommandOSDefcon final + : public Command +{ + static void SendLevels(CommandSource &source) + { + if (DConfig.Check(DEFCON_NO_NEW_CHANNELS)) + source.Reply(_("* No new channel registrations")); + if (DConfig.Check(DEFCON_NO_NEW_NICKS)) + source.Reply(_("* No new nick registrations")); + if (DConfig.Check(DEFCON_NO_MLOCK_CHANGE)) + source.Reply(_("* No mode lock changes")); + if (DConfig.Check(DEFCON_FORCE_CHAN_MODES) && !DConfig.chanmodes.empty()) + source.Reply(_("* Force channel modes (%s) to be set on all channels"), DConfig.chanmodes.c_str()); + if (DConfig.Check(DEFCON_REDUCE_SESSION)) + source.Reply(_("* Use the reduced session limit of %d"), DConfig.sessionlimit); + if (DConfig.Check(DEFCON_NO_NEW_CLIENTS)) + source.Reply(_("* Kill any new clients connecting")); + if (DConfig.Check(DEFCON_OPER_ONLY)) + source.Reply(_("* Ignore non-opers with a message")); + if (DConfig.Check(DEFCON_SILENT_OPER_ONLY)) + source.Reply(_("* Silently ignore non-opers")); + if (DConfig.Check(DEFCON_AKILL_NEW_CLIENTS)) + source.Reply(_("* AKILL any new clients connecting")); + if (DConfig.Check(DEFCON_NO_NEW_MEMOS)) + source.Reply(_("* No new memos sent")); + } + +public: + CommandOSDefcon(Module *creator) : Command(creator, "operserv/defcon", 1, 1) + { + this->SetDesc(_("Manipulate the DefCon system")); + this->SetSyntax(_("[\0021\002|\0022\002|\0023\002|\0024\002|\0025\002]")); + } + + void Execute(CommandSource &source, const std::vector<Anope::string> ¶ms) override + { + const Anope::string &lvl = params[0]; + + if (lvl.empty()) + { + source.Reply(_("Services are now at DEFCON \002%d\002."), DConfig.defaultlevel); + this->SendLevels(source); + return; + } + + auto newLevel = Anope::Convert<int>(lvl, 0); + if (newLevel < 1 || newLevel > 5) + { + this->OnSyntaxError(source, ""); + return; + } + + DConfig.defaultlevel = newLevel; + + FOREACH_MOD(OnDefconLevel, (newLevel)); + + delete timeout; + + if (DConfig.timeout) + timeout = new DefConTimeout(this->module, 5); + + source.Reply(_("Services are now at DEFCON \002%d\002."), DConfig.defaultlevel); + this->SendLevels(source); + Log(LOG_ADMIN, source, this) << "to change defcon level to " << newLevel; + + /* Global notice the user what is happening. Also any Message that + the Admin would like to add. Set in config file. */ + if (DConfig.globalondefcon) + { + if (DConfig.defaultlevel == 5 && !DConfig.offmessage.empty()) + GlobalService->SendSingle(DConfig.offmessage); + else if (DConfig.defaultlevel != 5) + { + GlobalService->SendSingle(Anope::printf(_("The Defcon level is now at: \002%d\002"), DConfig.defaultlevel)); + if (!DConfig.message.empty()) + GlobalService->SendSingle(DConfig.message); + } + } + + /* Run any defcon functions, e.g. FORCE CHAN MODE */ + runDefCon(); + return; + } + + bool OnHelp(CommandSource &source, const Anope::string &subcommand) override + { + this->SendSyntax(source); + source.Reply(" "); + source.Reply(_("The defcon system can be used to implement a pre-defined\n" + "set of restrictions to services useful during an attempted\n" + "attack on the network.")); + return true; + } +}; + +class OSDefcon final + : public Module +{ + ServiceReference<SessionService> session_service; + ServiceReference<XLineManager> akills; + CommandOSDefcon commandosdefcon; + + void ParseModeString() + { + int add = -1; /* 1 if adding, 0 if deleting, -1 if neither */ + ChannelMode *cm; + ChannelModeParam *cmp; + Anope::string modes, param; + + spacesepstream ss(DConfig.chanmodes); + + DConfig.DefConModesOn.clear(); + DConfig.DefConModesOff.clear(); + ss.GetToken(modes); + + /* Loop while there are modes to set */ + for (auto mode : modes) + { + switch (mode) + { + case '+': + add = 1; + continue; + case '-': + add = 0; + continue; + default: + if (add < 0) + continue; + } + + if ((cm = ModeManager::FindChannelModeByChar(mode))) + { + if (cm->type == MODE_STATUS || cm->type == MODE_LIST) + { + Log(this) << "DefConChanModes mode character '" << mode << "' cannot be locked"; + continue; + } + else if (add) + { + DConfig.DefConModesOn.insert(cm->name); + DConfig.DefConModesOff.erase(cm->name); + + if (cm->type == MODE_PARAM) + { + cmp = anope_dynamic_static_cast<ChannelModeParam *>(cm); + + if (!ss.GetToken(param)) + { + Log(this) << "DefConChanModes mode character '" << mode << "' has no parameter while one is expected"; + continue; + } + + if (!cmp->IsValid(param)) + continue; + + DConfig.SetDefConParam(cmp->name, param); + } + } + else if (DConfig.DefConModesOn.count(cm->name)) + { + DConfig.DefConModesOn.erase(cm->name); + + if (cm->type == MODE_PARAM) + DConfig.UnsetDefConParam(cm->name); + } + } + } + + /* We can't mlock +L if +l is not mlocked as well. */ + if ((cm = ModeManager::FindChannelModeByName("REDIRECT")) && DConfig.DefConModesOn.count(cm->name) && !DConfig.DefConModesOn.count("LIMIT")) + { + DConfig.DefConModesOn.erase("REDIRECT"); + + Log(this) << "DefConChanModes must lock mode +l as well to lock mode +L"; + } + } + +public: + OSDefcon(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, VENDOR), session_service("SessionService", "session"), akills("XLineManager", "xlinemanager/sgline"), commandosdefcon(this) + { + + } + + void OnReload(Configuration::Conf *conf) override + { + Configuration::Block *block = conf->GetModule(this); + DefconConfig dconfig; + + dconfig.defaultlevel = block->Get<int>("defaultlevel"); + dconfig.defcons[4] = block->Get<const Anope::string>("level4"); + dconfig.defcons[3] = block->Get<const Anope::string>("level3"); + dconfig.defcons[2] = block->Get<const Anope::string>("level2"); + dconfig.defcons[1] = block->Get<const Anope::string>("level1"); + dconfig.sessionlimit = block->Get<int>("sessionlimit"); + dconfig.akillreason = block->Get<const Anope::string>("akillreason"); + dconfig.akillexpire = block->Get<time_t>("akillexpire"); + dconfig.chanmodes = block->Get<const Anope::string>("chanmodes"); + dconfig.timeout = block->Get<time_t>("timeout"); + dconfig.globalondefcon = block->Get<bool>("globalondefcon"); + dconfig.message = block->Get<const Anope::string>("message"); + dconfig.offmessage = block->Get<const Anope::string>("offmessage"); + + block = conf->GetModule("os_session"); + + dconfig.max_session_kill = block->Get<int>("maxsessionkill"); + dconfig.session_autokill_expiry = block->Get<time_t>("sessionautokillexpiry"); + dconfig.sle_reason = block->Get<const Anope::string>("sessionlimitexceeded"); + dconfig.sle_detailsloc = block->Get<const Anope::string>("sessionlimitdetailsloc"); + + if (dconfig.defaultlevel < 1 || dconfig.defaultlevel > 5) + throw ConfigException("The value for <defcon:defaultlevel> must be between 1 and 5"); + else if (dconfig.akillexpire <= 0) + throw ConfigException("The value for <defcon:akillexpire> must be greater than zero!"); + + for (unsigned level = 1; level < 5; ++level) + { + spacesepstream operations(dconfig.defcons[level]); + Anope::string operation; + while (operations.GetToken(operation)) + { + if (operation.equals_ci("nonewchannels")) + dconfig.Add(level, DEFCON_NO_NEW_CHANNELS); + else if (operation.equals_ci("nonewnicks")) + dconfig.Add(level, DEFCON_NO_NEW_NICKS); + else if (operation.equals_ci("nomlockchanges")) + dconfig.Add(level, DEFCON_NO_MLOCK_CHANGE); + else if (operation.equals_ci("forcechanmodes")) + dconfig.Add(level, DEFCON_FORCE_CHAN_MODES); + else if (operation.equals_ci("reducedsessions")) + dconfig.Add(level, DEFCON_REDUCE_SESSION); + else if (operation.equals_ci("nonewclients")) + dconfig.Add(level, DEFCON_NO_NEW_CLIENTS); + else if (operation.equals_ci("operonly")) + dconfig.Add(level, DEFCON_OPER_ONLY); + else if (operation.equals_ci("silentoperonly")) + dconfig.Add(level, DEFCON_SILENT_OPER_ONLY); + else if (operation.equals_ci("akillnewclients")) + dconfig.Add(level, DEFCON_AKILL_NEW_CLIENTS); + else if (operation.equals_ci("nonewmemos")) + dconfig.Add(level, DEFCON_NO_NEW_MEMOS); + } + + if (dconfig.Check(level, DEFCON_REDUCE_SESSION) && dconfig.sessionlimit <= 0) + throw ConfigException("The value for <defcon:sessionlimit> must be greater than zero!"); + else if (dconfig.Check(level, DEFCON_AKILL_NEW_CLIENTS) && dconfig.akillreason.empty()) + throw ConfigException("The value for <defcon:akillreason> must not be empty!"); + else if (dconfig.Check(level, DEFCON_FORCE_CHAN_MODES) && dconfig.chanmodes.empty()) + throw ConfigException("The value for <defcon:chanmodes> must not be empty!"); + } + + DConfig = dconfig; + this->ParseModeString(); + } + + EventReturn OnChannelModeSet(Channel *c, MessageSource &source, ChannelMode *mode, const Anope::string ¶m) override + { + if (DConfig.Check(DEFCON_FORCE_CHAN_MODES) && DConfig.DefConModesOff.count(mode->name) && source.GetUser() && !source.GetBot()) + { + c->RemoveMode(Config->GetClient("OperServ"), mode, param); + + return EVENT_STOP; + } + + return EVENT_CONTINUE; + } + + EventReturn OnChannelModeUnset(Channel *c, MessageSource &source, ChannelMode *mode, const Anope::string &) override + { + if (DConfig.Check(DEFCON_FORCE_CHAN_MODES) && DConfig.DefConModesOn.count(mode->name) && source.GetUser() && !source.GetBot()) + { + Anope::string param; + + if (DConfig.GetDefConParam(mode->name, param)) + c->SetMode(Config->GetClient("OperServ"), mode, param); + else + c->SetMode(Config->GetClient("OperServ"), mode); + + return EVENT_STOP; + + } + + return EVENT_CONTINUE; + } + + EventReturn OnPreCommand(CommandSource &source, Command *command, std::vector<Anope::string> ¶ms) override + { + if (DConfig.Check(DEFCON_OPER_ONLY) && !source.IsOper()) + { + source.Reply(_("Services are in DefCon mode, please try again later.")); + return EVENT_STOP; + } + else if (DConfig.Check(DEFCON_SILENT_OPER_ONLY) && !source.IsOper()) + { + return EVENT_STOP; + } + else if (command->name == "nickserv/register" || command->name == "nickserv/group") + { + if (DConfig.Check(DEFCON_NO_NEW_NICKS)) + { + source.Reply(_("Services are in DefCon mode, please try again later.")); + return EVENT_STOP; + } + } + else if (command->name == "chanserv/mode" && params.size() > 1 && params[1].equals_ci("LOCK")) + { + if (DConfig.Check(DEFCON_NO_MLOCK_CHANGE)) + { + source.Reply(_("Services are in DefCon mode, please try again later.")); + return EVENT_STOP; + } + } + else if (command->name == "chanserv/register") + { + if (DConfig.Check(DEFCON_NO_NEW_CHANNELS)) + { + source.Reply(_("Services are in DefCon mode, please try again later.")); + return EVENT_STOP; + } + } + else if (command->name == "memoserv/send") + { + if (DConfig.Check(DEFCON_NO_NEW_MEMOS)) + { + source.Reply(_("Services are in DefCon mode, please try again later.")); + return EVENT_STOP; + } + } + + return EVENT_CONTINUE; + } + + void OnUserConnect(User *u, bool &exempt) override + { + if (exempt || u->Quitting() || !u->server->IsSynced() || u->server->IsULined()) + return; + + BotInfo *OperServ = Config->GetClient("OperServ"); + if (DConfig.Check(DEFCON_AKILL_NEW_CLIENTS) && akills) + { + Log(OperServ, "operserv/defcon") << "DEFCON: adding akill for *@" << u->host; + XLine x("*@" + u->host, OperServ ? OperServ->nick : "defcon", Anope::CurTime + DConfig.akillexpire, DConfig.akillreason, XLineManager::GenerateUID()); + akills->Send(NULL, &x); + } + + if (DConfig.Check(DEFCON_NO_NEW_CLIENTS) || DConfig.Check(DEFCON_AKILL_NEW_CLIENTS)) + { + u->Kill(OperServ, DConfig.akillreason); + return; + } + + if (DConfig.sessionlimit <= 0 || !session_service) + return; + + Session *session = session_service->FindSession(u->ip.addr()); + Exception *exception = session_service->FindException(u); + + if (DConfig.Check(DEFCON_REDUCE_SESSION) && !exception) + { + if (session && session->count > static_cast<unsigned>(DConfig.sessionlimit)) + { + if (!DConfig.sle_reason.empty()) + { + Anope::string message = DConfig.sle_reason.replace_all_cs("%IP%", u->ip.addr()); + u->SendMessage(OperServ, message); + } + if (!DConfig.sle_detailsloc.empty()) + u->SendMessage(OperServ, DConfig.sle_detailsloc); + + ++session->hits; + if (akills && DConfig.max_session_kill && session->hits >= DConfig.max_session_kill) + { + XLine x("*@" + session->addr.mask(), OperServ ? OperServ->nick : "", Anope::CurTime + DConfig.session_autokill_expiry, "Defcon session limit exceeded", XLineManager::GenerateUID()); + akills->Send(NULL, &x); + Log(OperServ, "akill/defcon") << "[DEFCON] Added a temporary AKILL for \002*@" << session->addr.mask() << "\002 due to excessive connections"; + } + else + { + u->Kill(OperServ, "Defcon session limit exceeded"); + } + } + } + } + + void OnChannelModeAdd(ChannelMode *cm) override + { + if (DConfig.chanmodes.find(cm->mchar) != Anope::string::npos) + this->ParseModeString(); + } + + void OnChannelSync(Channel *c) override + { + if (DConfig.Check(DEFCON_FORCE_CHAN_MODES)) + c->SetModes(Config->GetClient("OperServ"), false, DConfig.chanmodes); + } +}; + +static void runDefCon() +{ + BotInfo *OperServ = Config->GetClient("OperServ"); + if (DConfig.Check(DEFCON_FORCE_CHAN_MODES)) + { + if (!DConfig.chanmodes.empty() && !DefConModesSet) + { + if (DConfig.chanmodes[0] == '+' || DConfig.chanmodes[0] == '-') + { + Log(OperServ, "operserv/defcon") << "DEFCON: setting " << DConfig.chanmodes << " on all channels"; + DefConModesSet = true; + for (const auto &[_, chan] : ChannelList) + chan->SetModes(OperServ, false, DConfig.chanmodes); + } + } + } + else + { + if (!DConfig.chanmodes.empty() && DefConModesSet) + { + if (DConfig.chanmodes[0] == '+' || DConfig.chanmodes[0] == '-') + { + DefConModesSet = false; + Anope::string newmodes = defconReverseModes(DConfig.chanmodes); + if (!newmodes.empty()) + { + Log(OperServ, "operserv/defcon") << "DEFCON: setting " << newmodes << " on all channels"; + for (const auto &[_, chan] : ChannelList) + chan->SetModes(OperServ, true, newmodes); + } + } + } + } +} + +static Anope::string defconReverseModes(const Anope::string &modes) +{ + if (modes.empty()) + return ""; + Anope::string newmodes; + for (auto mode : modes) + { + if (mode == '+') + newmodes += '-'; + else if (mode == '-') + newmodes += '+'; + else + newmodes += mode; + } + return newmodes; +} + +MODULE_INIT(OSDefcon) |