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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 std::string& modeline)
39         {
40                 for (std::string::const_iterator i = modeline.begin(); i != modeline.end(); ++i)
41                 {
42                         ModeHandler* mh = ServerInstance->Modes->FindMode(*i, MODETYPE_CHANNEL);
43                         if (!mh)
44                                 continue;
45
46                         if (mh->GetLevelRequired() > userlevel)
47                                 return true;
48                 }
49                 return false;
50         }
51
52         ModResult HandleJoinOverride(LocalUser* user, Channel* chan, const std::string& keygiven, const char* bypasswhat, const char* mode)
53         {
54                 if (RequireKey && keygiven != "override")
55                 {
56                         // Can't join normally -- must use a special key to bypass restrictions
57                         user->WriteNotice("*** You may not join normally. You must join with a key of 'override' to oper override.");
58                         return MOD_RES_PASSTHRU;
59                 }
60
61                 if (NoisyOverride)
62                         chan->WriteChannelWithServ(ServerInstance->Config->ServerName, "NOTICE %s :%s used oper override to bypass %s", chan->name.c_str(), user->nick.c_str(), bypasswhat);
63                 ServerInstance->SNO->WriteGlobalSno('v', user->nick+" used oper override to bypass " + mode + " on " + chan->name);
64                 return MOD_RES_ALLOW;
65         }
66
67  public:
68         ModuleOverride()
69                 : topiclock(this, "topiclock")
70                 , inviteonly(this, "inviteonly")
71                 , key(this, "key")
72                 , limit(this, "limit")
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                         {
126                                 ServerInstance->SNO->WriteGlobalSno('v',source->nick+" used oper override to kick "+memb->user->nick+" on "+memb->chan->name+" ("+reason+")");
127                                 return MOD_RES_ALLOW;
128                         }
129                 }
130                 return MOD_RES_PASSTHRU;
131         }
132
133         ModResult OnPreMode(User* source,User* dest,Channel* channel, const std::vector<std::string>& parameters) CXX11_OVERRIDE
134         {
135                 if (!channel)
136                         return MOD_RES_PASSTHRU;
137                 if (!source->IsOper() || !IS_LOCAL(source))
138                         return MOD_RES_PASSTHRU;
139
140                 unsigned int mode = channel->GetPrefixValue(source);
141
142                 if (!IsOverride(mode, parameters[1]))
143                         return MOD_RES_PASSTHRU;
144
145                 if (CanOverride(source, "MODE"))
146                 {
147                         std::string msg = source->nick+" overriding modes:";
148                         for(unsigned int i=0; i < parameters.size(); i++)
149                                 msg += " " + parameters[i];
150                         ServerInstance->SNO->WriteGlobalSno('v',msg);
151                         return MOD_RES_ALLOW;
152                 }
153                 return MOD_RES_PASSTHRU;
154         }
155
156         ModResult OnUserPreJoin(LocalUser* user, Channel* chan, const std::string& cname, std::string& privs, const std::string& keygiven) CXX11_OVERRIDE
157         {
158                 if (user->IsOper())
159                 {
160                         if (chan)
161                         {
162                                 if (chan->IsModeSet(inviteonly) && (CanOverride(user,"INVITE")))
163                                 {
164                                         if (!user->IsInvited(chan))
165                                                 return HandleJoinOverride(user, chan, keygiven, "invite-only", "+i");
166                                         return MOD_RES_ALLOW;
167                                 }
168
169                                 if (chan->IsModeSet(key) && (CanOverride(user,"KEY")) && keygiven != chan->GetModeParameter(key))
170                                         return HandleJoinOverride(user, chan, keygiven, "the channel key", "+k");
171
172                                 if (chan->IsModeSet(limit) && (chan->GetUserCounter() >= ConvToInt(chan->GetModeParameter(limit))) && (CanOverride(user,"LIMIT")))
173                                         return HandleJoinOverride(user, chan, keygiven, "the channel limit", "+l");
174
175                                 if (chan->IsBanned(user) && CanOverride(user,"BANWALK"))
176                                         return HandleJoinOverride(user, chan, keygiven, "channel ban", "channel ban");
177                         }
178                 }
179                 return MOD_RES_PASSTHRU;
180         }
181
182         Version GetVersion() CXX11_OVERRIDE
183         {
184                 return Version("Provides support for allowing opers to override certain things",VF_VENDOR);
185         }
186 };
187
188 MODULE_INIT(ModuleOverride)