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 Override : public SimpleUserModeHandler
  31 {
  32  public:
  33         Override(Module* Creator) : SimpleUserModeHandler(Creator, "override", 'O')
  34         {
  35                 oper = true;
  36                 if (!ServerInstance->Config->ConfValue("override")->getBool("enableumode"))
  37                         DisableAutoRegister();
  38         }
  39 };
  40
  41 class ModuleOverride : public Module
  42 {
  43         bool RequireKey;
  44         bool NoisyOverride;
  45         bool UmodeEnabled;
  46         Override ou;
  47         ChanModeReference topiclock;
  48         ChanModeReference inviteonly;
  49         ChanModeReference key;
  50         ChanModeReference limit;
  51         Invite::API invapi;
  52
  53         static bool IsOverride(unsigned int userlevel, const Modes::ChangeList::List& list)
  54         {
  55                 for (Modes::ChangeList::List::const_iterator i = list.begin(); i != list.end(); ++i)
  56                 {
  57                         ModeHandler* mh = i->mh;
  58                         if (mh->GetLevelRequired(i->adding) > userlevel)
  59                                 return true;
  60                 }
  61                 return false;
  62         }
  63
  64         ModResult HandleJoinOverride(LocalUser* user, Channel* chan, const std::string& keygiven, const char* bypasswhat, const char* mode)
  65         {
  66                 if (RequireKey && keygiven != "override")
  67                 {
  68                         // Can't join normally -- must use a special key to bypass restrictions
  69                         user->WriteNotice("*** You may not join normally. You must join with a key of 'override' to oper override.");
  70                         return MOD_RES_PASSTHRU;
  71                 }
  72
  73                 if (NoisyOverride)
  74                         chan->WriteNotice(InspIRCd::Format("%s used oper override to bypass %s", user->nick.c_str(), bypasswhat));
  75                 ServerInstance->SNO->WriteGlobalSno('v', user->nick+" used oper override to bypass " + mode + " on " + chan->name);
  76                 return MOD_RES_ALLOW;
  77         }
  78
  79  public:
  80         ModuleOverride()
  81                 : UmodeEnabled(false)
  82                 , ou(this)
  83                 , topiclock(this, "topiclock")
  84                 , inviteonly(this, "inviteonly")
  85                 , key(this, "key")
  86                 , limit(this, "limit")
  87                 , invapi(this)
  88         {
  89         }
  90
  91         void init() CXX11_OVERRIDE
  92         {
  93                 ServerInstance->SNO->EnableSnomask('v', "OVERRIDE");
  94                 UmodeEnabled = ServerInstance->Config->ConfValue("override")->getBool("enableumode");
  95         }
  96
  97         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
  98         {
  99                 // re-read our config options
 100                 ConfigTag* tag = ServerInstance->Config->ConfValue("override");
 101                 NoisyOverride = tag->getBool("noisy");
 102                 RequireKey = tag->getBool("requirekey");
 103         }
 104
 105         void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
 106         {
 107                 tokens["OVERRIDE"];
 108         }
 109
 110         bool CanOverride(User* source, const char* token)
 111         {
 112                 // If we require oper override umode (+O) but it is not set
 113                 if (UmodeEnabled && !source->IsModeSet(ou))
 114                         return false;
 115
 116                 std::string tokenlist = source->oper->getConfig("override");
 117                 // its defined or * is set, return its value as a boolean for if the token is set
 118                 return ((tokenlist.find(token, 0) != std::string::npos) || (tokenlist.find("*", 0) != std::string::npos));
 119         }
 120
 121
 122         ModResult OnPreTopicChange(User *source, Channel *channel, const std::string &topic) CXX11_OVERRIDE
 123         {
 124                 if (IS_LOCAL(source) && source->IsOper() && CanOverride(source, "TOPIC"))
 125                 {
 126                         if (!channel->HasUser(source) || (channel->IsModeSet(topiclock) && channel->GetPrefixValue(source) < HALFOP_VALUE))
 127                         {
 128                                 ServerInstance->SNO->WriteGlobalSno('v',source->nick+" used oper override to change a topic on "+channel->name);
 129                         }
 130
 131                         // Explicit allow
 132                         return MOD_RES_ALLOW;
 133                 }
 134
 135                 return MOD_RES_PASSTHRU;
 136         }
 137
 138         ModResult OnUserPreKick(User* source, Membership* memb, const std::string &reason) CXX11_OVERRIDE
 139         {
 140                 if (source->IsOper() && CanOverride(source,"KICK"))
 141                 {
 142                         // If the kicker's status is less than the target's,                    or      the kicker's status is less than or equal to voice
 143                         if ((memb->chan->GetPrefixValue(source) < memb->getRank()) || (memb->chan->GetPrefixValue(source) <= VOICE_VALUE) ||
 144                             (memb->chan->GetPrefixValue(source) == HALFOP_VALUE && memb->getRank() == HALFOP_VALUE))
 145                         {
 146                                 ServerInstance->SNO->WriteGlobalSno('v',source->nick+" used oper override to kick "+memb->user->nick+" on "+memb->chan->name+" ("+reason+")");
 147                                 return MOD_RES_ALLOW;
 148                         }
 149                 }
 150                 return MOD_RES_PASSTHRU;
 151         }
 152
 153         ModResult OnPreMode(User* source, User* dest, Channel* channel, Modes::ChangeList& modes) CXX11_OVERRIDE
 154         {
 155                 if (!channel)
 156                         return MOD_RES_PASSTHRU;
 157                 if (!source->IsOper() || !IS_LOCAL(source))
 158                         return MOD_RES_PASSTHRU;
 159
 160                 const Modes::ChangeList::List& list = modes.getlist();
 161                 unsigned int mode = channel->GetPrefixValue(source);
 162
 163                 if (!IsOverride(mode, list))
 164                         return MOD_RES_PASSTHRU;
 165
 166                 if (CanOverride(source, "MODE"))
 167                 {
 168                         std::string msg = source->nick + " overriding modes: ";
 169
 170                         // Construct a MODE string in the old format for sending it as a snotice
 171                         std::string params;
 172                         char pm = 0;
 173                         for (Modes::ChangeList::List::const_iterator i = list.begin(); i != list.end(); ++i)
 174                         {
 175                                 const Modes::Change& item = *i;
 176                                 if (!item.param.empty())
 177                                         params.append(1, ' ').append(item.param);
 178
 179                                 char wanted_pm = (item.adding ? '+' : '-');
 180                                 if (wanted_pm != pm)
 181                                 {
 182                                         pm = wanted_pm;
 183                                         msg += pm;
 184                                 }
 185
 186                                 msg += item.mh->GetModeChar();
 187                         }
 188                         msg += params;
 189                         ServerInstance->SNO->WriteGlobalSno('v',msg);
 190                         return MOD_RES_ALLOW;
 191                 }
 192                 return MOD_RES_PASSTHRU;
 193         }
 194
 195         ModResult OnUserPreJoin(LocalUser* user, Channel* chan, const std::string& cname, std::string& privs, const std::string& keygiven) CXX11_OVERRIDE
 196         {
 197                 if (user->IsOper())
 198                 {
 199                         if (chan)
 200                         {
 201                                 if (chan->IsModeSet(inviteonly) && (CanOverride(user,"INVITE")))
 202                                 {
 203                                         if (!invapi->IsInvited(user, chan))
 204                                                 return HandleJoinOverride(user, chan, keygiven, "invite-only", "+i");
 205                                         return MOD_RES_ALLOW;
 206                                 }
 207
 208                                 if (chan->IsModeSet(key) && (CanOverride(user,"KEY")) && keygiven != chan->GetModeParameter(key))
 209                                         return HandleJoinOverride(user, chan, keygiven, "the channel key", "+k");
 210
 211                                 if (chan->IsModeSet(limit) && (chan->GetUserCounter() >= ConvToNum<size_t>(chan->GetModeParameter(limit))) && (CanOverride(user,"LIMIT")))
 212                                         return HandleJoinOverride(user, chan, keygiven, "the channel limit", "+l");
 213
 214                                 if (chan->IsBanned(user) && CanOverride(user,"BANWALK"))
 215                                         return HandleJoinOverride(user, chan, keygiven, "channel ban", "channel ban");
 216                         }
 217                 }
 218                 return MOD_RES_PASSTHRU;
 219         }
 220
 221         Version GetVersion() CXX11_OVERRIDE
 222         {
 223                 return Version("Provides support for allowing opers to override certain things",VF_VENDOR);
 224         }
 225 };
 226
 227 MODULE_INIT(ModuleOverride)