/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2022-2024 Sadie Powell <sadie@witchery.services>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "listmode.h"
#include "modules/account.h"
#include "modules/ctctags.h"
#include "modules/server.h"
#include "modules/stats.h"
#include "timeutils.h"
#include "xline.h"
enum
{
// From UnrealIRCd.
ERR_KILLDENY = 485,
// From Charybdis.
ERR_MLOCKRESTRICTED = 742,
// InspIRCd-specific.
ERR_TOPICLOCK = 744,
};
class RegisteredChannel final
: public SimpleChannelMode
{
public:
RegisteredChannel(Module* Creator)
: SimpleChannelMode(Creator, "c_registered", 'r')
{
if (ServerInstance->Config->ConfValue("servicesintegration")->getBool("disablemodes"))
DisableAutoRegister();
}
bool OnModeChange(User* source, User* dest, Channel* channel, Modes::Change& change) override
{
if (IS_LOCAL(source))
{
source->WriteNumeric(ERR_NOPRIVILEGES, INSP_FORMAT("Only a server may modify the +{} channel mode", GetModeChar()));
return false;
}
return SimpleChannelMode::OnModeChange(source, dest, channel, change);
}
};
class RegisteredUser final
: public SimpleUserMode
{
public:
RegisteredUser(Module* Creator)
: SimpleUserMode(Creator, "u_registered", 'r')
{
if (ServerInstance->Config->ConfValue("servicesintegration")->getBool("disablemodes"))
DisableAutoRegister();
}
bool OnModeChange(User* source, User* dest, Channel* channel, Modes::Change& change) override
{
if (IS_LOCAL(source))
{
source->WriteNumeric(ERR_NOPRIVILEGES, INSP_FORMAT("Only a server may modify the +{} user mode", GetModeChar()));
return false;
}
return SimpleUserMode::OnModeChange(source, dest, channel, change);
}
};
class ServiceTag final
: public CTCTags::TagProvider
{
public:
ServiceTag(Module* mod)
: CTCTags::TagProvider(mod)
{
}
void OnPopulateTags(ClientProtocol::Message& msg) override
{
const auto* user = msg.GetSourceUser();
if (user && user->server->IsService())
msg.AddTag("inspircd.org/service", this, "");
}
};
class ServProtect final
: public SimpleUserMode
{
public:
ServProtect(Module* Creator)
: SimpleUserMode(Creator, "servprotect", 'k', true)
{
}
bool OnModeChange(User* source, User* dest, Channel* channel, Modes::Change& change) override
{
// As this mode is only intended for use by pseudoclients the only way
// to set it is by introducing a user with it.
return false;
}
};
class SVSHold final
: public XLine
{
private:
std::string nickname;
public:
SVSHold(time_t settime, unsigned long period, const std::string& setter, const std::string& message, const std::string& nick)
: XLine(settime, period, setter, message, "SVSHOLD")
, nickname(nick)
{
}
void Apply(User* u) override
{
u->WriteNumeric(RPL_SAVENICK, u->nick, INSP_FORMAT("Services reserved nickname: {}", reason));
u->ChangeNick(u->uuid);
}
const std::string& Displayable() const override
{
return nickname;
}
void DisplayExpiry() override
{
// SVSHOLDs do not generate any messages.
}
bool Matches(User* user) const override
{
return irc::equals(user->nick, nickname);
}
bool Matches(const std::string& text) const override
{
return irc::equals(text, nickname);
}
};
class SVSHoldFactory final
: public XLineFactory
{
public:
SVSHoldFactory()
: XLineFactory("SVSHOLD")
{
}
XLine* Generate(time_t settime, unsigned long duration, const std::string& source, const std::string& reason, const std::string& nick) override
{
return new SVSHold(settime, duration, source, reason, nick);
}
};
class CommandSVSCMode final
: public Command
{
public:
CommandSVSCMode(Module* mod)
: Command(mod, "SVSCMODE", 3)
{
access_needed = CmdAccess::SERVER;
}
CmdResult Handle(User* user, const Params& parameters) override
{
// The command can only be executed by remote services servers.
if (IS_LOCAL(user) || !user->server->IsService())
return CmdResult::FAILURE;
auto* u = ServerInstance->Users.FindUUID(parameters[0]);
if (!u)
return CmdResult::FAILURE;
auto* c = ServerInstance->Channels.Find(parameters[1]);
if (!c)
return CmdResult::FAILURE;
for (auto mode : parameters[2])
{
auto* mh = ServerInstance->Modes.FindMode(mode, MODETYPE_CHANNEL);
if (!mh || !mh->IsListModeBase())
continue; // Not a list mode.
auto* list = mh->IsListModeBase()->GetList(c);
if (!list)
continue; // No list modes set.
Modes::ChangeList changelist;
for (const auto& entry : *list)
{
if (c->CheckBan(u, entry.mask))
changelist.push(mh, false, entry.mask);
}
ServerInstance->Modes.Process(user, c, nullptr, changelist);
}
return CmdResult::SUCCESS;
}
};
class CommandSVSHold final
: public Command
{
public:
CommandSVSHold(Module* Creator)
: Command(Creator, "SVSHOLD")
{
access_needed = CmdAccess::SERVER;
}
CmdResult Handle(User* user, const Params& parameters) override
{
// The command can only be executed by remote services servers.
if (IS_LOCAL(user) || !user->server->IsService())
return CmdResult::FAILURE;
if (parameters.size() == 1)
{
// :36DAAAAAA SVSHOLD ChanServ
std::string reason;
return ServerInstance->XLines->DelLine(parameters[0], "SVSHOLD", reason, user) ? CmdResult::SUCCESS : CmdResult::FAILURE;
}
if (parameters.size() == 3)
{
/// :36DAAAAAA SVSHOLD NickServ 86400 :Reserved for services
/// :36DAAAAAA SVSHOLD NickServ 1d :Reserved for services
unsigned long duration;
if (!Duration::TryFrom(parameters[1], duration))
return CmdResult::FAILURE;
auto* svshold = new SVSHold(ServerInstance->Time(), duration, user->nick, parameters[2], parameters[0]);
return ServerInstance->XLines->AddLine(svshold, user) ? CmdResult::SUCCESS : CmdResult::FAILURE;
}
return CmdResult::FAILURE;
}
RouteDescriptor GetRouting(User* user, const Params& parameters) override
{
return ROUTE_BROADCAST;
}
};
class CommandSVSJoin final
: public Command
{
public:
CommandSVSJoin(Module* mod)
: Command(mod, "SVSJOIN", 2)
{
access_needed = CmdAccess::SERVER;
}
CmdResult Handle(User* user, const Params& parameters) override
{
// The command can only be executed by remote services servers.
if (IS_LOCAL(user) || !user->server->IsService())
return CmdResult::FAILURE;
// Check for a valid channel name.
if (!ServerInstance->Channels.IsChannel(parameters[1]))
return CmdResult::FAILURE;
// Check the target exists/
auto* u = ServerInstance->Users.FindUUID(parameters[0]);
if (!u)
return CmdResult::FAILURE;
/* only join if it's local, otherwise just pass it on! */
auto* lu = IS_LOCAL(u);
if (lu)
{
bool override = false;
std::string key;
if (parameters.size() >= 3)
{
key = parameters[2];
if (key.empty())
override = true;
}
Channel::JoinUser(lu, parameters[1], override, key);
}
return CmdResult::SUCCESS;
}
RouteDescriptor GetRouting(User* user, const Params& parameters) override
{
return ROUTE_UNICAST(parameters[0]);
}
};
class CommandSVSNick final
: public Command
{
public:
CommandSVSNick(Module* mod)
: Command(mod, "SVSNICK", 3)
{
access_needed = CmdAccess::SERVER;
}
CmdResult Handle(User* user, const Params& parameters) override
{
// The command can only be executed by remote services servers.
if (IS_LOCAL(user) || !user->server->IsService())
return CmdResult::FAILURE;
auto* u = ServerInstance->Users.Find(parameters[0]);
if (u && IS_LOCAL(u))
{
// The 4th parameter is optional and it is the expected nick TS of the target user. If
// this parameter is present and it doesn't match the user's nick TS, the SVSNICK is not
// acted upon.
//
// This makes it possible to detect the case when services wants to change the nick of
// a user, but the user changes their nick before the SVSNICK arrives, making the
// SVSNICK nick change (usually to a guest nick) unnecessary. Consider the following for
// example:
//
// 1. test changes nick to Attila which is protected by services
// 2. Services SVSNICKs the user to Guest12345
// 3. Attila changes nick to Attila_ which isn't protected by services
// 4. SVSNICK arrives
// 5. Attila_ gets his nick changed to Guest12345 unnecessarily
//
// In this case when the SVSNICK is processed the target has already changed their nick
// to something which isn't protected, so changing the nick again to a Guest nick is not
// desired. However, if the expected nick TS parameter is present in the SVSNICK then
// the nick change in step 5 won't happen because the timestamps won't match.
if (parameters.size() > 3)
{
time_t expectedts = ConvToNum<time_t>(parameters[3]);
if (!expectedts)
return CmdResult::INVALID; // Malformed message
if (u->nickchanged != expectedts)
return CmdResult::FAILURE; // Ignore SVSNICK
}
std::string nick = parameters[1];
if (isdigit(nick[0]))
nick = u->uuid;
time_t nickts = ConvToNum<time_t>(parameters[2]);
if (!nickts)
return CmdResult::INVALID; // Malformed message
if (!u->ChangeNick(nick, nickts))
{
// Changing to 'nick' failed (it may already be in use), change to the uuid
u->WriteNumeric(RPL_SAVENICK, u->uuid, "Your nickname is in use by an older user on a new server.");
u->ChangeNick(u->uuid);
}
}
return CmdResult::SUCCESS;
}
RouteDescriptor GetRouting(User* user, const Params& parameters) override
{
return ROUTE_UNICAST(parameters[0]);
}
};
class CommandSVSOper final
: public Command
{
public:
CommandSVSOper(Module* Creator)
: Command(Creator, "SVSOPER", 2, 2)
{
access_needed = CmdAccess::SERVER;
}
CmdResult Handle(User* user, const Params& parameters) override
{
if (!user->server->IsService())
return CmdResult::FAILURE;
auto* target = ServerInstance->Users.FindUUID(parameters[0]);
if (!target)
return CmdResult::FAILURE;
if (IS_LOCAL(target))
{
auto iter = ServerInstance->Config->OperTypes.find(parameters[1]);
if (iter == ServerInstance->Config->OperTypes.end())
return CmdResult::FAILURE;
auto automatic = parameters.GetTags().find("~automatic") != parameters.GetTags().end();
auto account = std::make_shared<OperAccount>(MODNAME, iter->second, ServerInstance->Config->EmptyTag);
target->OperLogin(account, automatic, true);
}
return CmdResult::SUCCESS;
}
RouteDescriptor GetRouting(User* user, const Params& parameters) override
{
auto* target = ServerInstance->Users.FindUUID(parameters[0]);
if (!target)
return ROUTE_LOCALONLY;
return ROUTE_OPT_UCAST(target->server);
}
};
class CommandSVSPart final
: public Command
{
public:
CommandSVSPart(Module* mod)
: Command(mod, "SVSPART", 2)
{
access_needed = CmdAccess::SERVER;
}
CmdResult Handle(User* user, const Params& parameters) override
{
// The command can only be executed by remote services servers.
if (IS_LOCAL(user) || !user->server->IsService())
return CmdResult::FAILURE;
auto* u = ServerInstance->Users.FindUUID(parameters[0]);
if (!u)
return CmdResult::FAILURE;
auto* c = ServerInstance->Channels.Find(parameters[1]);
if (!c)
return CmdResult::FAILURE;
if (IS_LOCAL(u))
c->PartUser(u, parameters.size() == 3 ? parameters[2] : "Services forced part");
return CmdResult::SUCCESS;
}
RouteDescriptor GetRouting(User* user, const Params& parameters) override
{
return ROUTE_UNICAST(parameters[0]);
}
};
class CommandSVSTopic final
: public Command
{
public:
CommandSVSTopic(Module* mod)
: Command(mod, "SVSTOPIC", 1, 4)
{
access_needed = CmdAccess::SERVER;
allow_empty_last_param = true;
}
CmdResult Handle(User* user, const Params& parameters) override
{
// The command can only be executed by remote services servers.
if (IS_LOCAL(user) || !user->server->IsService())
return CmdResult::FAILURE;
auto* chan = ServerInstance->Channels.Find(parameters[0]);
if (!chan)
return CmdResult::FAILURE;
if (parameters.size() == 4)
{
// 4 parameter version, set all topic data on the channel to the ones given in the parameters.
time_t topicts = ConvToNum<time_t>(parameters[1]);
if (!topicts)
{
ServerInstance->Logs.Debug(MODNAME, "Received SVSTOPIC with a 0 topicts; dropped.");
return CmdResult::INVALID;
}
chan->SetTopic(user, parameters[3], topicts, ¶meters[2]);
}
else
{
// 1 parameter version, nuke the topic
chan->SetTopic(user, std::string(), 0);
chan->setby.clear();
}
return CmdResult::SUCCESS;
}
RouteDescriptor GetRouting(User* user, const Params& parameters) override
{
return ROUTE_BROADCAST;
}
};
class ModuleServices final
: public Module
, public ServerProtocol::RouteEventListener
, public Stats::EventListener
{
private:
Account::API accountapi;
RegisteredChannel registeredcmode;
RegisteredUser registeredumode;
ServiceTag servicetag;
ServProtect servprotectmode;
SVSHoldFactory svsholdfactory;
BoolExtItem auspexext;
StringExtItem mlockext;
BoolExtItem topiclockext;
CommandSVSCMode svscmodecmd;
CommandSVSHold svsholdcmd;
CommandSVSJoin svsjoincmd;
CommandSVSNick svsnickcmd;
CommandSVSOper svsopercmd;
CommandSVSPart svspartcmd;
CommandSVSTopic svstopiccmd;
bool accountoverrideshold;
bool HandleModeLock(User* user, Channel* chan, const Modes::Change& change)
{
const auto* mlock = mlockext.Get(chan);
if (!mlock)
return true; // No mode lock.
if (mlock->find(change.mh->GetModeChar()) == std::string::npos)
return true; // Mode is not locked.
user->WriteNumeric(ERR_MLOCKRESTRICTED, chan->name, change.mh->GetModeChar(), *mlock, INSP_FORMAT("Mode cannot be changed as it has been locked {} by services!",
chan->IsModeSet(change.mh) ? "on" : "off"));
return false;
}
bool HandleProtectedService(User* user, Channel* chan, const Modes::Change& change)
{
if (change.adding || change.param.empty())
return true; // We only care about local users removing prefix modes.
const auto* pm = change.mh->IsPrefixMode();
if (!pm)
return true; // Mode is not a prefix mode.
auto* target = ServerInstance->Users.Find(change.param);
if (!target)
return true; // Target does not exist.
Membership* memb = chan->GetUser(target);
if (!memb || !memb->HasMode(pm))
return true; // Target does not have the mode.
if (!target->IsModeSet(servprotectmode))
return true; // Target is not a protected service.
user->WriteNumeric(ERR_RESTRICTED, chan->name, INSP_FORMAT("You are not permitted to remove privileges from {} services!", ServerInstance->Config->Network));
return false;
}
public:
ModuleServices()
: Module(VF_COMMON | VF_VENDOR, "Provides support for integrating with a services server.")
, ServerProtocol::RouteEventListener(this)
, Stats::EventListener(this)
, accountapi(this)
, registeredcmode(this)
, registeredumode(this)
, servicetag(this)
, servprotectmode(this)
, auspexext(this, "auspex", ExtensionType::CHANNEL, true)
, mlockext(this, "mlock", ExtensionType::CHANNEL, true)
, topiclockext(this, "topiclock", ExtensionType::CHANNEL, true)
, svscmodecmd(this)
, svsholdcmd(this)
, svsjoincmd(this)
, svsnickcmd(this)
, svsopercmd(this)
, svspartcmd(this)
, svstopiccmd(this)
{
}
~ModuleServices() override
{
ServerInstance->XLines->DelAll("SVSHOLD");
ServerInstance->XLines->UnregisterFactory(&svsholdfactory);
}
void init() override
{
ServerInstance->XLines->RegisterFactory(&svsholdfactory);
}
void ReadConfig(ConfigStatus& status) override
{
const auto& tag = ServerInstance->Config->ConfValue("servicesintegration");
accountoverrideshold = tag->getBool("accountoverrideshold");
}
ModResult OnRouteMessage(const Channel* channel, const Server* server) override
{
if (!server->IsService() || !auspexext.Get(channel))
return MOD_RES_PASSTHRU;
// Allow services to see messages in this channel even if not guarded.
return MOD_RES_ALLOW;
}
ModResult OnKill(User* source, User* dest, const std::string& reason) override
{
if (!source)
return MOD_RES_PASSTHRU;
if (dest->IsModeSet(servprotectmode))
{
source->WriteNumeric(ERR_KILLDENY, INSP_FORMAT("You are not permitted to kill {} services!", ServerInstance->Config->Network));
return MOD_RES_DENY;
}
return MOD_RES_PASSTHRU;
}
ModResult OnPreTopicChange(User* user, Channel* chan, const std::string& topic) override
{
if (!IS_LOCAL(user) || !topiclockext.Get(chan))
return MOD_RES_PASSTHRU; // Remote user or no topiclock.
user->WriteNumeric(ERR_TOPICLOCK, chan->name, "Topic cannot be changed as it has been locked by services!");
return MOD_RES_DENY;
}
ModResult OnRawMode(User* user, Channel* chan, const Modes::Change& change) override
{
if (!IS_LOCAL(user) || !chan)
return MOD_RES_PASSTHRU; // Not our job to handle.
if (!HandleProtectedService(user, chan, change))
return MOD_RES_DENY;
if (!HandleModeLock(user, chan, change))
return MOD_RES_DENY;
return MOD_RES_PASSTHRU;
}
ModResult OnStats(Stats::Context& stats) override
{
if (stats.GetSymbol() != 'S')
return MOD_RES_PASSTHRU;
ServerInstance->XLines->InvokeStats("SVSHOLD", stats);
return MOD_RES_DENY;
}
ModResult OnUserPreKick(User* source, Membership* memb, const std::string& reason) override
{
if (memb->user->IsModeSet(servprotectmode))
{
source->WriteNumeric(ERR_RESTRICTED, memb->chan->name, INSP_FORMAT("You are not permitted to kick {} services!", ServerInstance->Config->Network));
return MOD_RES_DENY;
}
return MOD_RES_PASSTHRU;
}
ModResult OnUserPreNick(LocalUser* user, const std::string& newnick) override
{
auto* svshold = ServerInstance->XLines->MatchesLine("SVSHOLD", newnick);
if (!svshold)
return MOD_RES_PASSTHRU;
if (accountoverrideshold && accountapi)
{
Account::NickList* nicks = accountapi->GetAccountNicks(user);
if (nicks && nicks->find(svshold->Displayable()) != nicks->end())
{
std::string reason;
ServerInstance->XLines->DelLine(svshold, reason, user);
return MOD_RES_PASSTHRU;
}
}
user->WriteNumeric(ERR_ERRONEUSNICKNAME, newnick, INSP_FORMAT("Services reserved nickname: {}", svshold->reason));
return MOD_RES_DENY;
}
void OnUserPostNick(User* user, const std::string& oldnick) override
{
if (user->IsModeSet(registeredumode) && !irc::equals(oldnick, user->nick))
registeredumode.RemoveMode(user);
}
};
MODULE_INIT(ModuleServices)
