summaryrefslogtreecommitdiff
path: root/src/modules/m_chanprotect.cpp
blob: e436e922526e436833b7d8262cfb75135b30370c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
 * See: http://wiki.inspircd.org/Credits
 *
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

#include "inspircd.h"
#include "m_override.h"

/* $ModDesc: Provides channel modes +a and +q */

#define PROTECT_VALUE 40000
#define FOUNDER_VALUE 50000

/** Handles basic operation of +qa channel modes
 */
class FounderProtectBase
{
 private:
	InspIRCd* MyInstance;
	std::string extend;
	std::string type;
	int list;
	int end;
 protected:
	bool& remove_own_privs;
	bool& remove_other_privs;
 public:
	FounderProtectBase(InspIRCd* Instance, const std::string &ext, const std::string &mtype, int l, int e, bool &remove_own, bool &remove_others) :
		MyInstance(Instance), extend(ext), type(mtype), list(l), end(e), remove_own_privs(remove_own), remove_other_privs(remove_others)
	{
	}

	ModePair ModeSet(User* source, User* dest, Channel* channel, const std::string &parameter)
	{
		User* x = MyInstance->FindNick(parameter);
		if (x)
		{
			if (!channel->HasUser(x))
			{
				return std::make_pair(false, parameter);
			}
			else
			{
				std::string item = extend+std::string(channel->name);
				if (x->GetExt(item))
				{
					return std::make_pair(true, x->nick);
				}
				else
				{
					return std::make_pair(false, parameter);
				}
			}
		}
		return std::make_pair(false, parameter);
	}

	void RemoveMode(Channel* channel, char mc, irc::modestacker* stack)
	{
		CUList* cl = channel->GetUsers();
		std::string item = extend + std::string(channel->name);
		std::vector<std::string> mode_junk;
		mode_junk.push_back(channel->name);
		irc::modestacker modestack(MyInstance, false);
		std::deque<std::string> stackresult;

		for (CUList::iterator i = cl->begin(); i != cl->end(); i++)
		{
			if (i->first->GetExt(item))
			{
				if (stack)
					stack->Push(mc, i->first->nick);
				else
					modestack.Push(mc, i->first->nick);
			}
		}

		if (stack)
			return;

		while (modestack.GetStackedLine(stackresult))
		{
			mode_junk.insert(mode_junk.end(), stackresult.begin(), stackresult.end());
			MyInstance->SendMode(mode_junk, MyInstance->FakeClient);
			mode_junk.erase(mode_junk.begin() + 1, mode_junk.end());
		}
	}

	void DisplayList(User* user, Channel* channel)
	{
		CUList* cl = channel->GetUsers();
		std::string item = extend+std::string(channel->name);
		for (CUList::reverse_iterator i = cl->rbegin(); i != cl->rend(); ++i)
		{
			if (i->first->GetExt(item))
			{
				user->WriteServ("%d %s %s %s", list, user->nick.c_str(), channel->name.c_str(), i->first->nick.c_str());
			}
		}
		user->WriteServ("%d %s %s :End of channel %s list", end, user->nick.c_str(), channel->name.c_str(), type.c_str());
	}

	User* FindAndVerify(std::string &parameter, Channel* channel)
	{
		User* theuser = MyInstance->FindNick(parameter);
		if ((!theuser) || (!channel->HasUser(theuser)))
		{
			parameter.clear();
			return NULL;
		}
		return theuser;
	}

	bool CanRemoveOthers(User* u1, User* u2, Channel* c)
	{
		std::string item = extend+std::string(c->name);
		return (remove_other_privs && u1->GetExt(item) && u2->GetExt(item));
	}

	ModeAction HandleChange(User* source, User* theuser, bool adding, Channel* channel, std::string &parameter)
	{
		std::string item = extend+std::string(channel->name);

		if (adding)
		{
			if (!theuser->GetExt(item))
			{
				theuser->Extend(item);
				parameter = theuser->nick;
				return MODEACTION_ALLOW;
			}
		}
		else
		{
			if (theuser->GetExt(item))
			{
				theuser->Shrink(item);
				parameter = theuser->nick;
				return MODEACTION_ALLOW;
			}
		}
		return MODEACTION_DENY;
	}
};

/** Abstraction of FounderProtectBase for channel mode +q
 */
class ChanFounder : public ModeHandler, public FounderProtectBase
{
 public:
	ChanFounder(InspIRCd* Instance, Module* Creator, char my_prefix, bool &depriv_self, bool &depriv_others)
		: ModeHandler(Instance, Creator, 'q', 1, 1, true, MODETYPE_CHANNEL, false, my_prefix, 0, TR_NICK),
		  FounderProtectBase(Instance, "cm_founder_", "founder", 386, 387, depriv_self, depriv_others) { }

	unsigned int GetPrefixRank()
	{
		return FOUNDER_VALUE;
	}

	ModePair ModeSet(User* source, User* dest, Channel* channel, const std::string &parameter)
	{
		return FounderProtectBase::ModeSet(source, dest, channel, parameter);
	}

	void RemoveMode(Channel* channel, irc::modestacker* stack)
	{
		FounderProtectBase::RemoveMode(channel, this->GetModeChar(), stack);
	}

	void RemoveMode(User* user, irc::modestacker* stack)
	{
	}

	ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string &parameter, bool adding)
	{
		User* theuser = FounderProtectBase::FindAndVerify(parameter, channel);

		if (!theuser)
		{
			return MODEACTION_DENY;
		}

		if ((!adding) && FounderProtectBase::CanRemoveOthers(source, theuser, channel))
		{
			return FounderProtectBase::HandleChange(source, theuser, adding, channel, parameter);
		}

		char isoverride=0;
		Module *Override = ServerInstance->Modules->FindFeature("Override");
		if (Override)
		{
			OVRrequest ovr(NULL,Override,source,"OTHERMODE");
			const char * tmp = ovr.Send();
			isoverride = tmp[0];
		}
		 // source is a server, or ulined, we'll let them +-q the user.
		if (source == ServerInstance->FakeClient ||
				((source == theuser) && (!adding) && (FounderProtectBase::remove_own_privs)) ||
				(ServerInstance->ULine(source->nick.c_str())) ||
				(ServerInstance->ULine(source->server)) ||
				(!*source->server) ||
				(!IS_LOCAL(source)) ||
				isoverride)
		{
			return FounderProtectBase::HandleChange(source, theuser, adding, channel, parameter);
		}
		else
		{
			// whoops, someones being naughty!
			source->WriteNumeric(468, "%s %s :Only servers may set channel mode +q", source->nick.c_str(), channel->name.c_str());
			parameter.clear();
			return MODEACTION_DENY;
		}
	}

	void DisplayList(User* user, Channel* channel)
	{
		FounderProtectBase::DisplayList(user,channel);
	}
};

/** Abstraction of FounderProtectBase for channel mode +a
 */
class ChanProtect : public ModeHandler, public FounderProtectBase
{
 public:
	ChanProtect(InspIRCd* Instance, Module* Creator, char my_prefix, bool &depriv_self, bool &depriv_others)
		: ModeHandler(Instance, Creator, 'a', 1, 1, true, MODETYPE_CHANNEL, false, my_prefix, 0, TR_NICK),
		  FounderProtectBase(Instance,"cm_protect_","protected user", 388, 389, depriv_self, depriv_others) { }

	unsigned int GetPrefixRank()
	{
		return PROTECT_VALUE;
	}

	ModePair ModeSet(User* source, User* dest, Channel* channel, const std::string &parameter)
	{
		return FounderProtectBase::ModeSet(source, dest, channel, parameter);
	}

	void RemoveMode(Channel* channel, irc::modestacker* stack)
	{
		FounderProtectBase::RemoveMode(channel, this->GetModeChar(), stack);
	}

	void RemoveMode(User* user, irc::modestacker* stack)
	{
	}

	ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string &parameter, bool adding)
	{
		User* theuser = FounderProtectBase::FindAndVerify(parameter, channel);

		if (!theuser)
			return MODEACTION_DENY;

		std::string founder = "cm_founder_"+std::string(channel->name);

		if ((!adding) && FounderProtectBase::CanRemoveOthers(source, theuser, channel))
		{
			return FounderProtectBase::HandleChange(source, theuser, adding, channel, parameter);
		}

		char isoverride=0;
		Module *Override = ServerInstance->Modules->FindFeature("Override");
		if (Override)
		{
			OVRrequest ovr(NULL,Override,source,"OTHERMODE");
			const char * tmp = ovr.Send();
			isoverride = tmp[0];
		}
		// source has +q, is a server, or ulined, we'll let them +-a the user.
		if (source == ServerInstance->FakeClient ||
			((source == theuser) && (!adding) && (FounderProtectBase::remove_own_privs)) ||
			(ServerInstance->ULine(source->nick.c_str())) ||
			(ServerInstance->ULine(source->server)) ||
			(!*source->server) ||
			(source->GetExt(founder)) ||
			(!IS_LOCAL(source)) ||
			isoverride
			)
		{
			return FounderProtectBase::HandleChange(source, theuser, adding, channel, parameter);
		}
		else
		{
			// bzzzt, wrong answer!
			source->WriteNumeric(482, "%s %s :You are not a channel founder", source->nick.c_str(), channel->name.c_str());
			return MODEACTION_DENY;
		}
	}

	virtual void DisplayList(User* user, Channel* channel)
	{
		FounderProtectBase::DisplayList(user, channel);
	}

};

class ModuleChanProtect : public Module
{

	bool FirstInGetsFounder;
	char QPrefix;
	char APrefix;
	bool DeprivSelf;
	bool DeprivOthers;
	bool booting;
	ChanProtect* cp;
	ChanFounder* cf;

 public:

	ModuleChanProtect(InspIRCd* Me)
		: Module(Me), FirstInGetsFounder(false), QPrefix(0), APrefix(0), DeprivSelf(false), DeprivOthers(false), booting(true), cp(NULL), cf(NULL)
	{
		/* Load config stuff */
		LoadSettings();
		booting = false;

		/* Initialise module variables */

		cp = new ChanProtect(ServerInstance, this, APrefix, DeprivSelf, DeprivOthers);
		cf = new ChanFounder(ServerInstance, this, QPrefix, DeprivSelf, DeprivOthers);

		if (!ServerInstance->Modes->AddMode(cp) || !ServerInstance->Modes->AddMode(cf))
		{
			delete cp;
			delete cf;
			throw ModuleException("Could not add new modes!");
		}

		Implementation eventlist[] = { I_OnUserKick, I_OnUserPart, I_OnUserPreJoin, I_OnAccessCheck };
		ServerInstance->Modules->Attach(eventlist, this, 4);
	}

	virtual void OnUserKick(User* source, User* user, Channel* chan, const std::string &reason, bool &silent)
	{
		// FIX: when someone gets kicked from a channel we must remove their Extensibles!
		user->Shrink("cm_founder_"+std::string(chan->name));
		user->Shrink("cm_protect_"+std::string(chan->name));
	}

	virtual void OnUserPart(User* user, Channel* channel, std::string &partreason, bool &silent)
	{
		// FIX: when someone parts a channel we must remove their Extensibles!
		user->Shrink("cm_founder_"+std::string(channel->name));
		user->Shrink("cm_protect_"+std::string(channel->name));
	}

	void LoadSettings()
	{
		ConfigReader Conf(ServerInstance);

		FirstInGetsFounder = Conf.ReadFlag("chanprotect", "noservices", 0);

		std::string qpre = Conf.ReadValue("chanprotect", "qprefix", 0);
		QPrefix = qpre.empty() ? 0 : qpre[0];

		std::string apre = Conf.ReadValue("chanprotect", "aprefix", 0);
		APrefix = apre.empty() ? 0 : apre[0];

		if ((APrefix && QPrefix) && APrefix == QPrefix)
			throw ModuleException("What the smeg, why are both your +q and +a prefixes the same character?");

		if (cp && ServerInstance->Modes->FindPrefix(APrefix) == cp)
			throw ModuleException("Looks like the +a prefix you picked for m_chanprotect is already in use. Pick another.");

		if (cf && ServerInstance->Modes->FindPrefix(QPrefix) == cf)
			throw ModuleException("Looks like the +q prefix you picked for m_chanprotect is already in use. Pick another.");

		DeprivSelf = Conf.ReadFlag("chanprotect","deprotectself", "yes", 0);
		DeprivOthers = Conf.ReadFlag("chanprotect","deprotectothers", "yes", 0);
	}

	virtual int OnUserPreJoin(User *user, Channel *chan, const char *cname, std::string &privs, const std::string &keygiven)
	{
		// if the user is the first user into the channel, mark them as the founder, but only if
		// the config option for it is set

		if (FirstInGetsFounder && !chan)
			privs = std::string(1, QPrefix) + "@";

		return 0;
	}

	virtual int OnAccessCheck(User* source,User* dest,Channel* channel,int access_type)
	{
		// here we perform access checks, this is the important bit that actually stops kicking/deopping
		// etc of protected users. There are many types of access check, we're going to handle
		// a relatively small number of them relevent to our module using a switch statement.
		// don't allow action if:
		// (A) Theyre founder (no matter what)
		// (B) Theyre protected, unless you're founder or are protected and DeprivOthers is enabled
		// always allow the action if:
		// (A) The source is ulined

		// firstly, if a ulined nick, or a server, is setting the mode, then allow them to set the mode
		// without any access checks, we're not worthy :p
		if ((ServerInstance->ULine(source->nick.c_str())) || (ServerInstance->ULine(source->server)) || (!*source->server))
			return ACR_ALLOW;

		std::string founder("cm_founder_"+channel->name);
		std::string protect("cm_protect_"+channel->name);

		// Can do anything to yourself if deprotectself is enabled.
		if (DeprivSelf && source == dest)
			return ACR_DEFAULT;

		bool candepriv_founder = (DeprivOthers && source->GetExt(founder));
		bool candepriv_protected = (source->GetExt(founder) || (DeprivOthers && source->GetExt(protect))); // Can the source remove +a?

		switch (access_type)
		{
			// a user has been deopped. Do we let them? hmmm...
			case AC_DEOP:
				if (dest->GetExt(founder) && !candepriv_founder)
				{
					source->WriteNumeric(484, source->nick+" "+channel->name+" :Can't deop "+dest->nick+" as they're a channel founder");
					return ACR_DENY;
				}
				if ((dest->GetExt(protect)) && !candepriv_protected)
				{
					source->WriteNumeric(484, source->nick+" "+channel->name+" :Can't deop "+dest->nick+" as they're protected (+a)");
					return ACR_DENY;
				}
			break;

			// a user is being kicked. do we chop off the end of the army boot?
			case AC_KICK:
				if (dest->GetExt(founder) && !candepriv_founder)
				{
					source->WriteNumeric(484, source->nick+" "+channel->name+" :Can't kick "+dest->nick+" as they're a channel founder");
					return ACR_DENY;
				}
				if ((dest->GetExt(protect)) && !candepriv_protected)
				{
					source->WriteNumeric(484, source->nick+" "+channel->name+" :Can't kick "+dest->nick+" as they're protected (+a)");
					return ACR_DENY;
				}
			break;

			// a user is being dehalfopped. Yes, we do disallow -h of a +ha user
			case AC_DEHALFOP:
				if (dest->GetExt(founder) && !candepriv_founder)
				{
					source->WriteNumeric(484, source->nick+" "+channel->name+" :Can't de-halfop "+dest->nick+" as they're a channel founder");
					return ACR_DENY;
				}
				if ((dest->GetExt(protect)) && !candepriv_protected)
				{
					source->WriteNumeric(484, source->nick+" "+channel->name+" :Can't de-halfop "+dest->nick+" as they're protected (+a)");
					return ACR_DENY;
				}
			break;

			// same with devoice.
			case AC_DEVOICE:
				if (dest->GetExt(founder) && !candepriv_founder)
				{
					source->WriteNumeric(484, source->nick+" "+channel->name+" :Can't devoice "+dest->nick+" as they're a channel founder");
					return ACR_DENY;
				}
				if ((dest->GetExt(protect)) && !candepriv_protected)
				{
					source->WriteNumeric(484, source->nick+" "+channel->name+" :Can't devoice "+dest->nick+" as they're protected (+a)");
					return ACR_DENY;
				}
			break;
		}

		// we dont know what this access check is, or dont care. just carry on, nothing to see here.
		return ACR_DEFAULT;
	}

	virtual ~ModuleChanProtect()
	{
		ServerInstance->Modes->DelMode(cp);
		ServerInstance->Modes->DelMode(cf);
		delete cp;
		delete cf;
	}

	virtual Version GetVersion()
	{
		return Version("$Id$", VF_COMMON | VF_VENDOR, API_VERSION);
	}
};

MODULE_INIT(ModuleChanProtect)