src/modules/m_remove.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2017 B00mX0r <b00mx0r@aureus.pw>
   5  *   Copyright (C) 2013, 2018, 2020 Sadie Powell <sadie@witchery.services>
   6  *   Copyright (C) 2012-2014, 2016 Attila Molnar <attilamolnar@hush.com>
   7  *   Copyright (C) 2012, 2019 Robby <robby@chatbelgie.be>
   8  *   Copyright (C) 2012 Justin Crawford <Justasic@Gmail.com>
   9  *   Copyright (C) 2009 Uli Schlachter <psychon@inspircd.org>
  10  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
  11  *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
  12  *   Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
  13  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
  14  *   Copyright (C) 2006 Oliver Lupton <om@inspircd.org>
  15  *   Copyright (C) 2005-2006, 2010 Craig Edwards <brain@inspircd.org>
  16  *
  17  * This file is part of InspIRCd.  InspIRCd is free software: you can
  18  * redistribute it and/or modify it under the terms of the GNU General Public
  19  * License as published by the Free Software Foundation, version 2.
  20  *
  21  * This program is distributed in the hope that it will be useful, but WITHOUT
  22  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  23  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  24  * details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  28  */
  29
  30
  31 #include "inspircd.h"
  32
  33 /*
  34  * This module supports the use of the +q and +a usermodes, but should work without them too.
  35  * Usage of the command is restricted to +hoaq, and you cannot remove a user with a "higher" level than yourself.
  36  * eg: +h can remove +hv and users with no modes. +a can remove +aohv and users with no modes.
  37 */
  38
  39 /** Base class for /FPART and /REMOVE
  40  */
  41 class RemoveBase : public Command
  42 {
  43         bool& supportnokicks;
  44         ChanModeReference& nokicksmode;
  45
  46  public:
  47         unsigned int protectedrank;
  48
  49         RemoveBase(Module* Creator, bool& snk, ChanModeReference& nkm, const char* cmdn)
  50                 : Command(Creator, cmdn, 2, 3)
  51                 , supportnokicks(snk)
  52                 , nokicksmode(nkm)
  53         {
  54         }
  55
  56         CmdResult HandleRMB(User* user, const CommandBase::Params& parameters,  bool fpart)
  57         {
  58                 User* target;
  59                 Channel* channel;
  60                 std::string reason;
  61
  62                 // If the command is a /REMOVE then detect the parameter order
  63                 bool neworder = ((fpart) || (parameters[0][0] == '#'));
  64
  65                 /* Set these to the parameters needed, the new version of this module switches it's parameters around
  66                  * supplying a new command with the new order while keeping the old /remove with the older order.
  67                  * /remove <nick> <channel> [reason ...]
  68                  * /fpart <channel> <nick> [reason ...]
  69                  */
  70                 const std::string& channame = parameters[neworder ? 0 : 1];
  71                 const std::string& username = parameters[neworder ? 1 : 0];
  72
  73                 /* Look up the user we're meant to be removing from the channel */
  74                 if (IS_LOCAL(user))
  75                         target = ServerInstance->FindNickOnly(username);
  76                 else
  77                         target = ServerInstance->FindNick(username);
  78
  79                 /* And the channel we're meant to be removing them from */
  80                 channel = ServerInstance->FindChan(channame);
  81
  82                 /* Fix by brain - someone needs to learn to validate their input! */
  83                 if (!channel)
  84                 {
  85                         user->WriteNumeric(Numerics::NoSuchChannel(channame));
  86                         return CMD_FAILURE;
  87                 }
  88                 if ((!target) || (target->registered != REG_ALL))
  89                 {
  90                         user->WriteNumeric(Numerics::NoSuchNick(username));
  91                         return CMD_FAILURE;
  92                 }
  93
  94                 if (!channel->HasUser(target))
  95                 {
  96                         user->WriteNotice(InspIRCd::Format("*** User %s is not on channel %s", target->nick.c_str(), channel->name.c_str()));
  97                         return CMD_FAILURE;
  98                 }
  99
 100                 if (target->server->IsULine())
 101                 {
 102                         user->WriteNumeric(ERR_CHANOPRIVSNEEDED, channame, "Only a U-line may remove a U-line from a channel.");
 103                         return CMD_FAILURE;
 104                 }
 105
 106                 /* We support the +Q channel mode via. the m_nokicks module, if the module is loaded and the mode is set then disallow the /remove */
 107                 if ((!IS_LOCAL(user)) || (!supportnokicks) || (!channel->IsModeSet(nokicksmode)))
 108                 {
 109                         /* We'll let everyone remove their level and below, eg:
 110                          * ops can remove ops, halfops, voices, and those with no mode (no moders actually are set to 1)
 111                          * a ulined target will get a higher level than it's possible for a /remover to get..so they're safe.
 112                          * Nobody may remove people with >= protectedrank rank.
 113                          */
 114                         unsigned int ulevel = channel->GetPrefixValue(user);
 115                         unsigned int tlevel = channel->GetPrefixValue(target);
 116                         if ((!IS_LOCAL(user)) || ((ulevel > VOICE_VALUE) && (ulevel >= tlevel) && ((protectedrank == 0) || (tlevel < protectedrank))))
 117                         {
 118                                 // REMOVE will be sent to the target's server and it will reply with a PART (or do nothing if it doesn't understand the command)
 119                                 if (!IS_LOCAL(target))
 120                                 {
 121                                         // Send an ENCAP REMOVE with parameters being in the old <user> <chan> order which is
 122                                         // compatible with both 2.0 and 3.0. This also turns FPART into REMOVE.
 123                                         CommandBase::Params p;
 124                                         p.push_back(target->uuid);
 125                                         p.push_back(channel->name);
 126                                         if (parameters.size() > 2)
 127                                                 p.push_back(":" + parameters[2]);
 128                                         ServerInstance->PI->SendEncapsulatedData(target->server->GetName(), "REMOVE", p, user);
 129
 130                                         return CMD_SUCCESS;
 131                                 }
 132
 133                                 std::string reasonparam;
 134
 135                                 /* If a reason is given, use it */
 136                                 if(parameters.size() > 2)
 137                                         reasonparam = parameters[2];
 138                                 else
 139                                         reasonparam = "No reason given";
 140
 141                                 /* Build up the part reason string. */
 142                                 reason = "Removed by " + user->nick + ": " + reasonparam;
 143
 144                                 channel->WriteRemoteNotice(InspIRCd::Format("%s removed %s from the channel", user->nick.c_str(), target->nick.c_str()));
 145                                 target->WriteNotice("*** " + user->nick + " removed you from " + channel->name + " with the message: " + reasonparam);
 146
 147                                 channel->PartUser(target, reason);
 148                         }
 149                         else
 150                         {
 151                                 user->WriteNotice(InspIRCd::Format("*** You do not have access to /REMOVE %s from %s", target->nick.c_str(), channel->name.c_str()));
 152                                 return CMD_FAILURE;
 153                         }
 154                 }
 155                 else
 156                 {
 157                         /* m_nokicks.so was loaded and +Q was set, block! */
 158                         user->WriteNumeric(ERR_RESTRICTED, channel->name, InspIRCd::Format("Can't remove user %s from channel (+Q is set)", target->nick.c_str()));
 159                         return CMD_FAILURE;
 160                 }
 161
 162                 return CMD_SUCCESS;
 163         }
 164 };
 165
 166 /** Handle /REMOVE
 167  */
 168 class CommandRemove : public RemoveBase
 169 {
 170  public:
 171         CommandRemove(Module* Creator, bool& snk, ChanModeReference& nkm)
 172                 : RemoveBase(Creator, snk, nkm, "REMOVE")
 173         {
 174                 syntax = "<channel> <nick> [:<reason>]";
 175                 TRANSLATE3(TR_NICK, TR_TEXT, TR_TEXT);
 176         }
 177
 178         CmdResult Handle(User* user, const Params& parameters) CXX11_OVERRIDE
 179         {
 180                 return HandleRMB(user, parameters, false);
 181         }
 182 };
 183
 184 /** Handle /FPART
 185  */
 186 class CommandFpart : public RemoveBase
 187 {
 188  public:
 189         CommandFpart(Module* Creator, bool& snk, ChanModeReference& nkm)
 190                 : RemoveBase(Creator, snk, nkm, "FPART")
 191         {
 192                 syntax = "<channel> <nick> [:<reason>]";
 193                 TRANSLATE3(TR_TEXT, TR_NICK, TR_TEXT);
 194         }
 195
 196         CmdResult Handle(User* user, const Params& parameters) CXX11_OVERRIDE
 197         {
 198                 return HandleRMB(user, parameters, true);
 199         }
 200 };
 201
 202 class ModuleRemove : public Module
 203 {
 204         ChanModeReference nokicksmode;
 205         CommandRemove cmd1;
 206         CommandFpart cmd2;
 207         bool supportnokicks;
 208
 209  public:
 210         ModuleRemove()
 211                 : nokicksmode(this, "nokick")
 212                 , cmd1(this, supportnokicks, nokicksmode)
 213                 , cmd2(this, supportnokicks, nokicksmode)
 214         {
 215         }
 216
 217         void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
 218         {
 219                 tokens["REMOVE"];
 220         }
 221
 222         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 223         {
 224                 ConfigTag* tag = ServerInstance->Config->ConfValue("remove");
 225                 supportnokicks = tag->getBool("supportnokicks");
 226                 cmd1.protectedrank = cmd2.protectedrank = tag->getUInt("protectedrank", 50000);
 227         }
 228
 229         Version GetVersion() CXX11_OVERRIDE
 230         {
 231                 return Version("Adds the /FPART and /REMOVE commands which allows channel operators to force part users from a channel.", VF_OPTCOMMON | VF_VENDOR);
 232         }
 233 };
 234
 235 MODULE_INIT(ModuleRemove)