src/modules/m_override.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2009 Uli Schlachter <psychon@znc.in>
   6  *   Copyright (C) 2007-2009 Robin Burchell <robin+git@viroteck.net>
   7  *   Copyright (C) 2007-2008 Dennis Friis <peavey@inspircd.org>
   8  *   Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
   9  *   Copyright (C) 2008 Geoff Bricker <geoff.bricker@gmail.com>
  10  *   Copyright (C) 2004-2006 Craig Edwards <craigedwards@brainbox.cc>
  11  *   Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
  12  *
  13  * This file is part of InspIRCd.  InspIRCd is free software: you can
  14  * redistribute it and/or modify it under the terms of the GNU General Public
  15  * License as published by the Free Software Foundation, version 2.
  16  *
  17  * This program is distributed in the hope that it will be useful, but WITHOUT
  18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  19  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24  */
  25
  26
  27 #include "inspircd.h"
  28 #include "modules/invite.h"
  29
  30 class ModuleOverride : public Module
  31 {
  32         bool RequireKey;
  33         bool NoisyOverride;
  34         ChanModeReference topiclock;
  35         ChanModeReference inviteonly;
  36         ChanModeReference key;
  37         ChanModeReference limit;
  38         Invite::API invapi;
  39
  40         static bool IsOverride(unsigned int userlevel, const Modes::ChangeList::List& list)
  41         {
  42                 for (Modes::ChangeList::List::const_iterator i = list.begin(); i != list.end(); ++i)
  43                 {
  44                         ModeHandler* mh = i->mh;
  45                         if (mh->GetLevelRequired(i->adding) > userlevel)
  46                                 return true;
  47                 }
  48                 return false;
  49         }
  50
  51         ModResult HandleJoinOverride(LocalUser* user, Channel* chan, const std::string& keygiven, const char* bypasswhat, const char* mode)
  52         {
  53                 if (RequireKey && keygiven != "override")
  54                 {
  55                         // Can't join normally -- must use a special key to bypass restrictions
  56                         user->WriteNotice("*** You may not join normally. You must join with a key of 'override' to oper override.");
  57                         return MOD_RES_PASSTHRU;
  58                 }
  59
  60                 if (NoisyOverride)
  61                         chan->WriteNotice(InspIRCd::Format("%s used oper override to bypass %s", user->nick.c_str(), bypasswhat));
  62                 ServerInstance->SNO->WriteGlobalSno('v', user->nick+" used oper override to bypass " + mode + " on " + chan->name);
  63                 return MOD_RES_ALLOW;
  64         }
  65
  66  public:
  67         ModuleOverride()
  68                 : topiclock(this, "topiclock")
  69                 , inviteonly(this, "inviteonly")
  70                 , key(this, "key")
  71                 , limit(this, "limit")
  72                 , invapi(this)
  73         {
  74         }
  75
  76         void init() CXX11_OVERRIDE
  77         {
  78                 ServerInstance->SNO->EnableSnomask('v', "OVERRIDE");
  79         }
  80
  81         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
  82         {
  83                 // re-read our config options
  84                 ConfigTag* tag = ServerInstance->Config->ConfValue("override");
  85                 NoisyOverride = tag->getBool("noisy");
  86                 RequireKey = tag->getBool("requirekey");
  87         }
  88
  89         void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
  90         {
  91                 tokens["OVERRIDE"];
  92         }
  93
  94         bool CanOverride(User* source, const char* token)
  95         {
  96                 std::string tokenlist = source->oper->getConfig("override");
  97
  98                 // its defined or * is set, return its value as a boolean for if the token is set
  99                 return ((tokenlist.find(token, 0) != std::string::npos) || (tokenlist.find("*", 0) != std::string::npos));
 100         }
 101
 102
 103         ModResult OnPreTopicChange(User *source, Channel *channel, const std::string &topic) CXX11_OVERRIDE
 104         {
 105                 if (IS_LOCAL(source) && source->IsOper() && CanOverride(source, "TOPIC"))
 106                 {
 107                         if (!channel->HasUser(source) || (channel->IsModeSet(topiclock) && channel->GetPrefixValue(source) < HALFOP_VALUE))
 108                         {
 109                                 ServerInstance->SNO->WriteGlobalSno('v',source->nick+" used oper override to change a topic on "+channel->name);
 110                         }
 111
 112                         // Explicit allow
 113                         return MOD_RES_ALLOW;
 114                 }
 115
 116                 return MOD_RES_PASSTHRU;
 117         }
 118
 119         ModResult OnUserPreKick(User* source, Membership* memb, const std::string &reason) CXX11_OVERRIDE
 120         {
 121                 if (source->IsOper() && CanOverride(source,"KICK"))
 122                 {
 123                         // If the kicker's status is less than the target's,                    or      the kicker's status is less than or equal to voice
 124                         if ((memb->chan->GetPrefixValue(source) < memb->getRank()) || (memb->chan->GetPrefixValue(source) <= VOICE_VALUE) ||
 125                             (memb->chan->GetPrefixValue(source) == HALFOP_VALUE && memb->getRank() == HALFOP_VALUE))
 126                         {
 127                                 ServerInstance->SNO->WriteGlobalSno('v',source->nick+" used oper override to kick "+memb->user->nick+" on "+memb->chan->name+" ("+reason+")");
 128                                 return MOD_RES_ALLOW;
 129                         }
 130                 }
 131                 return MOD_RES_PASSTHRU;
 132         }
 133
 134         ModResult OnPreMode(User* source, User* dest, Channel* channel, Modes::ChangeList& modes) CXX11_OVERRIDE
 135         {
 136                 if (!channel)
 137                         return MOD_RES_PASSTHRU;
 138                 if (!source->IsOper() || !IS_LOCAL(source))
 139                         return MOD_RES_PASSTHRU;
 140
 141                 const Modes::ChangeList::List& list = modes.getlist();
 142                 unsigned int mode = channel->GetPrefixValue(source);
 143
 144                 if (!IsOverride(mode, list))
 145                         return MOD_RES_PASSTHRU;
 146
 147                 if (CanOverride(source, "MODE"))
 148                 {
 149                         std::string msg = source->nick + " overriding modes: ";
 150
 151                         // Construct a MODE string in the old format for sending it as a snotice
 152                         std::string params;
 153                         char pm = 0;
 154                         for (Modes::ChangeList::List::const_iterator i = list.begin(); i != list.end(); ++i)
 155                         {
 156                                 const Modes::Change& item = *i;
 157                                 if (!item.param.empty())
 158                                         params.append(1, ' ').append(item.param);
 159
 160                                 char wanted_pm = (item.adding ? '+' : '-');
 161                                 if (wanted_pm != pm)
 162                                 {
 163                                         pm = wanted_pm;
 164                                         msg += pm;
 165                                 }
 166
 167                                 msg += item.mh->GetModeChar();
 168                         }
 169                         msg += params;
 170                         ServerInstance->SNO->WriteGlobalSno('v',msg);
 171                         return MOD_RES_ALLOW;
 172                 }
 173                 return MOD_RES_PASSTHRU;
 174         }
 175
 176         ModResult OnUserPreJoin(LocalUser* user, Channel* chan, const std::string& cname, std::string& privs, const std::string& keygiven) CXX11_OVERRIDE
 177         {
 178                 if (user->IsOper())
 179                 {
 180                         if (chan)
 181                         {
 182                                 if (chan->IsModeSet(inviteonly) && (CanOverride(user,"INVITE")))
 183                                 {
 184                                         if (!invapi->IsInvited(user, chan))
 185                                                 return HandleJoinOverride(user, chan, keygiven, "invite-only", "+i");
 186                                         return MOD_RES_ALLOW;
 187                                 }
 188
 189                                 if (chan->IsModeSet(key) && (CanOverride(user,"KEY")) && keygiven != chan->GetModeParameter(key))
 190                                         return HandleJoinOverride(user, chan, keygiven, "the channel key", "+k");
 191
 192                                 if (chan->IsModeSet(limit) && (chan->GetUserCounter() >= ConvToNum<size_t>(chan->GetModeParameter(limit))) && (CanOverride(user,"LIMIT")))
 193                                         return HandleJoinOverride(user, chan, keygiven, "the channel limit", "+l");
 194
 195                                 if (chan->IsBanned(user) && CanOverride(user,"BANWALK"))
 196                                         return HandleJoinOverride(user, chan, keygiven, "channel ban", "channel ban");
 197                         }
 198                 }
 199                 return MOD_RES_PASSTHRU;
 200         }
 201
 202         Version GetVersion() CXX11_OVERRIDE
 203         {
 204                 return Version("Provides support for allowing opers to override certain things",VF_VENDOR);
 205         }
 206 };
 207
 208 MODULE_INIT(ModuleOverride)