src/modules/m_override.cpp

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