src/modules/m_override.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2017 B00mX0r <b00mx0r@aureus.pw>
   5  *   Copyright (C) 2017 Adam <Adam@anope.org>
   6  *   Copyright (C) 2016 Sheogorath <sheogorath@shivering-isles.com>
   7  *   Copyright (C) 2013, 2017, 2020 Sadie Powell <sadie@witchery.services>
   8  *   Copyright (C) 2013 Daniel Vassdal <shutter@canternet.org>
   9  *   Copyright (C) 2012-2015 Attila Molnar <attilamolnar@hush.com>
  10  *   Copyright (C) 2012 Shawn Smith <ShawnSmith0828@gmail.com>
  11  *   Copyright (C) 2012 Robby <robby@chatbelgie.be>
  12  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
  13  *   Copyright (C) 2009 Uli Schlachter <psychon@inspircd.org>
  14  *   Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
  15  *   Copyright (C) 2007-2008 Dennis Friis <peavey@inspircd.org>
  16  *   Copyright (C) 2006, 2008, 2010 Craig Edwards <brain@inspircd.org>
  17  *
  18  * This file is part of InspIRCd.  InspIRCd is free software: you can
  19  * redistribute it and/or modify it under the terms of the GNU General Public
  20  * License as published by the Free Software Foundation, version 2.
  21  *
  22  * This program is distributed in the hope that it will be useful, but WITHOUT
  23  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  24  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  25  * details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  29  */
  30
  31
  32 #include "inspircd.h"
  33 #include "modules/invite.h"
  34
  35 class Override : public SimpleUserModeHandler
  36 {
  37  public:
  38         Override(Module* Creator) : SimpleUserModeHandler(Creator, "override", 'O')
  39         {
  40                 oper = true;
  41                 if (!ServerInstance->Config->ConfValue("override")->getBool("enableumode"))
  42                         DisableAutoRegister();
  43         }
  44 };
  45
  46 class ModuleOverride : public Module
  47 {
  48         bool RequireKey;
  49         bool NoisyOverride;
  50         bool UmodeEnabled;
  51         Override ou;
  52         ChanModeReference topiclock;
  53         ChanModeReference inviteonly;
  54         ChanModeReference key;
  55         ChanModeReference limit;
  56         Invite::API invapi;
  57
  58         static bool IsOverride(unsigned int userlevel, const Modes::ChangeList::List& list)
  59         {
  60                 for (Modes::ChangeList::List::const_iterator i = list.begin(); i != list.end(); ++i)
  61                 {
  62                         ModeHandler* mh = i->mh;
  63                         if (mh->GetLevelRequired(i->adding) > userlevel)
  64                                 return true;
  65                 }
  66                 return false;
  67         }
  68
  69         ModResult HandleJoinOverride(LocalUser* user, Channel* chan, const std::string& keygiven, const char* bypasswhat, const char* mode)
  70         {
  71                 if (RequireKey && keygiven != "override")
  72                 {
  73                         // Can't join normally -- must use a special key to bypass restrictions
  74                         user->WriteNotice("*** You may not join normally. You must join with a key of 'override' to oper override.");
  75                         return MOD_RES_PASSTHRU;
  76                 }
  77
  78                 if (NoisyOverride)
  79                         chan->WriteRemoteNotice(InspIRCd::Format("%s used oper override to bypass %s", user->nick.c_str(), bypasswhat));
  80                 ServerInstance->SNO->WriteGlobalSno('v', user->nick+" used oper override to bypass " + mode + " on " + chan->name);
  81                 return MOD_RES_ALLOW;
  82         }
  83
  84  public:
  85         ModuleOverride()
  86                 : UmodeEnabled(false)
  87                 , ou(this)
  88                 , topiclock(this, "topiclock")
  89                 , inviteonly(this, "inviteonly")
  90                 , key(this, "key")
  91                 , limit(this, "limit")
  92                 , invapi(this)
  93         {
  94         }
  95
  96         void init() CXX11_OVERRIDE
  97         {
  98                 ServerInstance->SNO->EnableSnomask('v', "OVERRIDE");
  99                 UmodeEnabled = ServerInstance->Config->ConfValue("override")->getBool("enableumode");
 100         }
 101
 102         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 103         {
 104                 // re-read our config options
 105                 ConfigTag* tag = ServerInstance->Config->ConfValue("override");
 106                 NoisyOverride = tag->getBool("noisy");
 107                 RequireKey = tag->getBool("requirekey");
 108         }
 109
 110         void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
 111         {
 112                 tokens["OVERRIDE"];
 113         }
 114
 115         bool CanOverride(User* source, const char* token)
 116         {
 117                 // If we require oper override umode (+O) but it is not set
 118                 if (UmodeEnabled && !source->IsModeSet(ou))
 119                         return false;
 120
 121                 std::string tokenlist = source->oper->getConfig("override");
 122                 // its defined or * is set, return its value as a boolean for if the token is set
 123                 return ((tokenlist.find(token, 0) != std::string::npos) || (tokenlist.find("*", 0) != std::string::npos));
 124         }
 125
 126
 127         ModResult OnPreTopicChange(User *source, Channel *channel, const std::string &topic) CXX11_OVERRIDE
 128         {
 129                 if (IS_LOCAL(source) && source->IsOper() && CanOverride(source, "TOPIC"))
 130                 {
 131                         if (!channel->HasUser(source) || (channel->IsModeSet(topiclock) && channel->GetPrefixValue(source) < HALFOP_VALUE))
 132                         {
 133                                 ServerInstance->SNO->WriteGlobalSno('v',source->nick+" used oper override to change a topic on "+channel->name);
 134                         }
 135
 136                         // Explicit allow
 137                         return MOD_RES_ALLOW;
 138                 }
 139
 140                 return MOD_RES_PASSTHRU;
 141         }
 142
 143         ModResult OnUserPreKick(User* source, Membership* memb, const std::string &reason) CXX11_OVERRIDE
 144         {
 145                 if (source->IsOper() && CanOverride(source,"KICK"))
 146                 {
 147                         // If the kicker's status is less than the target's,                    or      the kicker's status is less than or equal to voice
 148                         if ((memb->chan->GetPrefixValue(source) < memb->getRank()) || (memb->chan->GetPrefixValue(source) <= VOICE_VALUE) ||
 149                                 (memb->chan->GetPrefixValue(source) == HALFOP_VALUE && memb->getRank() == HALFOP_VALUE))
 150                         {
 151                                 ServerInstance->SNO->WriteGlobalSno('v',source->nick+" used oper override to kick "+memb->user->nick+" on "+memb->chan->name+" ("+reason+")");
 152                                 return MOD_RES_ALLOW;
 153                         }
 154                 }
 155                 return MOD_RES_PASSTHRU;
 156         }
 157
 158         ModResult OnPreMode(User* source, User* dest, Channel* channel, Modes::ChangeList& modes) CXX11_OVERRIDE
 159         {
 160                 if (!channel)
 161                         return MOD_RES_PASSTHRU;
 162                 if (!source->IsOper() || !IS_LOCAL(source))
 163                         return MOD_RES_PASSTHRU;
 164
 165                 const Modes::ChangeList::List& list = modes.getlist();
 166                 unsigned int mode = channel->GetPrefixValue(source);
 167
 168                 if (!IsOverride(mode, list))
 169                         return MOD_RES_PASSTHRU;
 170
 171                 if (CanOverride(source, "MODE"))
 172                 {
 173                         std::string msg = source->nick + " used oper override to set modes on " + channel->name + ": ";
 174
 175                         // Construct a MODE string in the old format for sending it as a snotice
 176                         std::string params;
 177                         char pm = 0;
 178                         for (Modes::ChangeList::List::const_iterator i = list.begin(); i != list.end(); ++i)
 179                         {
 180                                 const Modes::Change& item = *i;
 181                                 if (!item.param.empty())
 182                                         params.append(1, ' ').append(item.param);
 183
 184                                 char wanted_pm = (item.adding ? '+' : '-');
 185                                 if (wanted_pm != pm)
 186                                 {
 187                                         pm = wanted_pm;
 188                                         msg += pm;
 189                                 }
 190
 191                                 msg += item.mh->GetModeChar();
 192                         }
 193                         msg += params;
 194                         ServerInstance->SNO->WriteGlobalSno('v',msg);
 195                         return MOD_RES_ALLOW;
 196                 }
 197                 return MOD_RES_PASSTHRU;
 198         }
 199
 200         ModResult OnUserPreJoin(LocalUser* user, Channel* chan, const std::string& cname, std::string& privs, const std::string& keygiven) CXX11_OVERRIDE
 201         {
 202                 if (user->IsOper())
 203                 {
 204                         if (chan)
 205                         {
 206                                 if (chan->IsModeSet(inviteonly) && (CanOverride(user,"INVITE")))
 207                                 {
 208                                         if (!invapi->IsInvited(user, chan))
 209                                                 return HandleJoinOverride(user, chan, keygiven, "invite-only", "+i");
 210                                         return MOD_RES_ALLOW;
 211                                 }
 212
 213                                 if (chan->IsModeSet(key) && (CanOverride(user,"KEY")) && keygiven != chan->GetModeParameter(key))
 214                                         return HandleJoinOverride(user, chan, keygiven, "the channel key", "+k");
 215
 216                                 if (chan->IsModeSet(limit) && (chan->GetUserCounter() >= ConvToNum<size_t>(chan->GetModeParameter(limit))) && (CanOverride(user,"LIMIT")))
 217                                         return HandleJoinOverride(user, chan, keygiven, "the channel limit", "+l");
 218
 219                                 if (chan->IsBanned(user) && CanOverride(user,"BANWALK"))
 220                                         return HandleJoinOverride(user, chan, keygiven, "channel ban", "channel ban");
 221                         }
 222                 }
 223                 return MOD_RES_PASSTHRU;
 224         }
 225
 226         Version GetVersion() CXX11_OVERRIDE
 227         {
 228                 return Version("Allows server operators to be given privileges that allow them to ignore various channel-level restrictions.",VF_VENDOR);
 229         }
 230 };
 231
 232 MODULE_INIT(ModuleOverride)