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
  29 class ModuleOverride : public Module
  30 {
  31         bool RequireKey;
  32         bool NoisyOverride;
  33         ChanModeReference topiclock;
  34         ChanModeReference inviteonly;
  35         ChanModeReference key;
  36         ChanModeReference limit;
  37
  38         static bool IsOverride(unsigned int userlevel, const Modes::ChangeList::List& list)
  39         {
  40                 for (Modes::ChangeList::List::const_iterator i = list.begin(); i != list.end(); ++i)
  41                 {
  42                         ModeHandler* mh = i->mh;
  43                         if (mh->GetLevelRequired() > userlevel)
  44                                 return true;
  45                 }
  46                 return false;
  47         }
  48
  49         ModResult HandleJoinOverride(LocalUser* user, Channel* chan, const std::string& keygiven, const char* bypasswhat, const char* mode)
  50         {
  51                 if (RequireKey && keygiven != "override")
  52                 {
  53                         // Can't join normally -- must use a special key to bypass restrictions
  54                         user->WriteNotice("*** You may not join normally. You must join with a key of 'override' to oper override.");
  55                         return MOD_RES_PASSTHRU;
  56                 }
  57
  58                 if (NoisyOverride)
  59                         chan->WriteChannelWithServ(ServerInstance->Config->ServerName, "NOTICE %s :%s used oper override to bypass %s", chan->name.c_str(), user->nick.c_str(), bypasswhat);
  60                 ServerInstance->SNO->WriteGlobalSno('v', user->nick+" used oper override to bypass " + mode + " on " + chan->name);
  61                 return MOD_RES_ALLOW;
  62         }
  63
  64  public:
  65         ModuleOverride()
  66                 : topiclock(this, "topiclock")
  67                 , inviteonly(this, "inviteonly")
  68                 , key(this, "key")
  69                 , limit(this, "limit")
  70         {
  71         }
  72
  73         void init() CXX11_OVERRIDE
  74         {
  75                 ServerInstance->SNO->EnableSnomask('v', "OVERRIDE");
  76         }
  77
  78         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
  79         {
  80                 // re-read our config options
  81                 ConfigTag* tag = ServerInstance->Config->ConfValue("override");
  82                 NoisyOverride = tag->getBool("noisy");
  83                 RequireKey = tag->getBool("requirekey");
  84         }
  85
  86         void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
  87         {
  88                 tokens["OVERRIDE"];
  89         }
  90
  91         bool CanOverride(User* source, const char* token)
  92         {
  93                 std::string tokenlist = source->oper->getConfig("override");
  94
  95                 // its defined or * is set, return its value as a boolean for if the token is set
  96                 return ((tokenlist.find(token, 0) != std::string::npos) || (tokenlist.find("*", 0) != std::string::npos));
  97         }
  98
  99
 100         ModResult OnPreTopicChange(User *source, Channel *channel, const std::string &topic) CXX11_OVERRIDE
 101         {
 102                 if (IS_LOCAL(source) && source->IsOper() && CanOverride(source, "TOPIC"))
 103                 {
 104                         if (!channel->HasUser(source) || (channel->IsModeSet(topiclock) && channel->GetPrefixValue(source) < HALFOP_VALUE))
 105                         {
 106                                 ServerInstance->SNO->WriteGlobalSno('v',source->nick+" used oper override to change a topic on "+channel->name);
 107                         }
 108
 109                         // Explicit allow
 110                         return MOD_RES_ALLOW;
 111                 }
 112
 113                 return MOD_RES_PASSTHRU;
 114         }
 115
 116         ModResult OnUserPreKick(User* source, Membership* memb, const std::string &reason) CXX11_OVERRIDE
 117         {
 118                 if (source->IsOper() && CanOverride(source,"KICK"))
 119                 {
 120                         // If the kicker's status is less than the target's,                    or      the kicker's status is less than or equal to voice
 121                         if ((memb->chan->GetPrefixValue(source) < memb->getRank()) || (memb->chan->GetPrefixValue(source) <= VOICE_VALUE))
 122                         {
 123                                 ServerInstance->SNO->WriteGlobalSno('v',source->nick+" used oper override to kick "+memb->user->nick+" on "+memb->chan->name+" ("+reason+")");
 124                                 return MOD_RES_ALLOW;
 125                         }
 126                 }
 127                 return MOD_RES_PASSTHRU;
 128         }
 129
 130         ModResult OnPreMode(User* source, User* dest, Channel* channel, Modes::ChangeList& modes) CXX11_OVERRIDE
 131         {
 132                 if (!channel)
 133                         return MOD_RES_PASSTHRU;
 134                 if (!source->IsOper() || !IS_LOCAL(source))
 135                         return MOD_RES_PASSTHRU;
 136
 137                 const Modes::ChangeList::List& list = modes.getlist();
 138                 unsigned int mode = channel->GetPrefixValue(source);
 139
 140                 if (!IsOverride(mode, list))
 141                         return MOD_RES_PASSTHRU;
 142
 143                 if (CanOverride(source, "MODE"))
 144                 {
 145                         std::string msg = source->nick + " overriding modes: ";
 146
 147                         // Construct a MODE string in the old format for sending it as a snotice
 148                         std::string params;
 149                         char pm = 0;
 150                         for (Modes::ChangeList::List::const_iterator i = list.begin(); i != list.end(); ++i)
 151                         {
 152                                 const Modes::Change& item = *i;
 153                                 if (!item.param.empty())
 154                                         params.append(1, ' ').append(item.param);
 155
 156                                 char wanted_pm = (item.adding ? '+' : '-');
 157                                 if (wanted_pm != pm)
 158                                 {
 159                                         pm = wanted_pm;
 160                                         msg += pm;
 161                                 }
 162
 163                                 msg += item.mh->GetModeChar();
 164                         }
 165                         msg += params;
 166                         ServerInstance->SNO->WriteGlobalSno('v',msg);
 167                         return MOD_RES_ALLOW;
 168                 }
 169                 return MOD_RES_PASSTHRU;
 170         }
 171
 172         ModResult OnUserPreJoin(LocalUser* user, Channel* chan, const std::string& cname, std::string& privs, const std::string& keygiven) CXX11_OVERRIDE
 173         {
 174                 if (user->IsOper())
 175                 {
 176                         if (chan)
 177                         {
 178                                 if (chan->IsModeSet(inviteonly) && (CanOverride(user,"INVITE")))
 179                                 {
 180                                         if (!user->IsInvited(chan))
 181                                                 return HandleJoinOverride(user, chan, keygiven, "invite-only", "+i");
 182                                         return MOD_RES_ALLOW;
 183                                 }
 184
 185                                 if (chan->IsModeSet(key) && (CanOverride(user,"KEY")) && keygiven != chan->GetModeParameter(key))
 186                                         return HandleJoinOverride(user, chan, keygiven, "the channel key", "+k");
 187
 188                                 if (chan->IsModeSet(limit) && (chan->GetUserCounter() >= ConvToInt(chan->GetModeParameter(limit))) && (CanOverride(user,"LIMIT")))
 189                                         return HandleJoinOverride(user, chan, keygiven, "the channel limit", "+l");
 190
 191                                 if (chan->IsBanned(user) && CanOverride(user,"BANWALK"))
 192                                         return HandleJoinOverride(user, chan, keygiven, "channel ban", "channel ban");
 193                         }
 194                 }
 195                 return MOD_RES_PASSTHRU;
 196         }
 197
 198         Version GetVersion() CXX11_OVERRIDE
 199         {
 200                 return Version("Provides support for allowing opers to override certain things",VF_VENDOR);
 201         }
 202 };
 203
 204 MODULE_INIT(ModuleOverride)