src/modules/m_chanprotect.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 /* $ModDesc: Provides channel modes +a and +q */
  17 /* $ModDep: ../../include/u_listmode.h */
  18
  19 #define PROTECT_VALUE 40000
  20 #define FOUNDER_VALUE 50000
  21
  22 const char* fakevalue = "on";
  23
  24 /* When this is set to true, no restrictions apply to setting or
  25  * removal of +qa. This is used while unloading so that the server
  26  * can freely clear all of its users of the modes.
  27  */
  28 bool unload_kludge = false;
  29
  30 /** Handles basic operation of +qa channel modes
  31  */
  32 class FounderProtectBase
  33 {
  34  private:
  35         InspIRCd* MyInstance;
  36         std::string extend;
  37         std::string type;
  38         int list;
  39         int end;
  40         char* dummyptr;
  41  protected:
  42         bool& remove_own_privs;
  43         bool& remove_other_privs;
  44  public:
  45         FounderProtectBase(InspIRCd* Instance, const std::string &ext, const std::string &mtype, int l, int e, bool &remove_own, bool &remove_others) :
  46                 MyInstance(Instance), extend(ext), type(mtype), list(l), end(e), remove_own_privs(remove_own), remove_other_privs(remove_others)
  47         {
  48         }
  49
  50         ModePair ModeSet(User* source, User* dest, Channel* channel, const std::string &parameter)
  51         {
  52                 User* x = MyInstance->FindNick(parameter);
  53                 if (x)
  54                 {
  55                         if (!channel->HasUser(x))
  56                         {
  57                                 return std::make_pair(false, parameter);
  58                         }
  59                         else
  60                         {
  61                                 std::string item = extend+std::string(channel->name);
  62                                 if (x->GetExt(item,dummyptr))
  63                                 {
  64                                         return std::make_pair(true, x->nick);
  65                                 }
  66                                 else
  67                                 {
  68                                         return std::make_pair(false, parameter);
  69                                 }
  70                         }
  71                 }
  72                 return std::make_pair(false, parameter);
  73         }
  74
  75         void RemoveMode(Channel* channel, char mc)
  76         {
  77                 unload_kludge = true;
  78                 CUList* cl = channel->GetUsers();
  79                 std::string item = extend + std::string(channel->name);
  80                 const char* mode_junk[MAXMODES+2];
  81                 mode_junk[0] = channel->name;
  82                 irc::modestacker modestack(false);
  83                 std::deque<std::string> stackresult;
  84
  85                 for (CUList::iterator i = cl->begin(); i != cl->end(); i++)
  86                 {
  87                         if (i->first->GetExt(item, dummyptr))
  88                         {
  89                                 modestack.Push(mc, i->first->nick);
  90                         }
  91                 }
  92
  93                 while (modestack.GetStackedLine(stackresult))
  94                 {
  95                         for (size_t j = 0; j < stackresult.size(); j++)
  96                         {
  97                                 mode_junk[j+1] = stackresult[j].c_str();
  98                         }
  99                         MyInstance->SendMode(mode_junk, stackresult.size() + 1, MyInstance->FakeClient);
 100                 }
 101
 102                 unload_kludge = false;
 103         }
 104
 105         void DisplayList(User* user, Channel* channel)
 106         {
 107                 CUList* cl = channel->GetUsers();
 108                 std::string item = extend+std::string(channel->name);
 109                 for (CUList::reverse_iterator i = cl->rbegin(); i != cl->rend(); ++i)
 110                 {
 111                         if (i->first->GetExt(item, dummyptr))
 112                         {
 113                                 user->WriteServ("%d %s %s %s", list, user->nick, channel->name,i->first->nick);
 114                         }
 115                 }
 116                 user->WriteServ("%d %s %s :End of channel %s list", end, user->nick, channel->name, type.c_str());
 117         }
 118
 119         User* FindAndVerify(std::string &parameter, Channel* channel)
 120         {
 121                 User* theuser = MyInstance->FindNick(parameter);
 122                 if ((!theuser) || (!channel->HasUser(theuser)))
 123                 {
 124                         parameter.clear();
 125                         return NULL;
 126                 }
 127                 return theuser;
 128         }
 129
 130         bool CanRemoveOthers(User* u1, User* u2, Channel* c)
 131         {
 132                 std::string item = extend+std::string(c->name);
 133                 return (u1->GetExt(item, dummyptr) && u2->GetExt(item, dummyptr));
 134         }
 135
 136         ModeAction HandleChange(User* source, User* theuser, bool adding, Channel* channel, std::string &parameter)
 137         {
 138                 std::string item = extend+std::string(channel->name);
 139
 140                 if (adding)
 141                 {
 142                         if (!theuser->GetExt(item, dummyptr))
 143                         {
 144                                 theuser->Extend(item, fakevalue);
 145                                 parameter = theuser->nick;
 146                                 return MODEACTION_ALLOW;
 147                         }
 148                 }
 149                 else
 150                 {
 151                         if (theuser->GetExt(item, dummyptr))
 152                         {
 153                                 theuser->Shrink(item);
 154                                 parameter = theuser->nick;
 155                                 return MODEACTION_ALLOW;
 156                         }
 157                 }
 158                 return MODEACTION_DENY;
 159         }
 160 };
 161
 162 /** Abstraction of FounderProtectBase for channel mode +q
 163  */
 164 class ChanFounder : public ModeHandler, public FounderProtectBase
 165 {
 166         char* dummyptr;
 167  public:
 168         ChanFounder(InspIRCd* Instance, bool using_prefixes, bool &depriv_self, bool &depriv_others)
 169                 : ModeHandler(Instance, 'q', 1, 1, true, MODETYPE_CHANNEL, false, using_prefixes ? '~' : 0),
 170                   FounderProtectBase(Instance, "cm_founder_", "founder", 386, 387, depriv_self, depriv_others) { }
 171
 172         unsigned int GetPrefixRank()
 173         {
 174                 return FOUNDER_VALUE;
 175         }
 176
 177         ModePair ModeSet(User* source, User* dest, Channel* channel, const std::string &parameter)
 178         {
 179                 return FounderProtectBase::ModeSet(source, dest, channel, parameter);
 180         }
 181
 182         void RemoveMode(Channel* channel)
 183         {
 184                 FounderProtectBase::RemoveMode(channel, this->GetModeChar());
 185         }
 186
 187         void RemoveMode(User* user)
 188         {
 189         }
 190
 191         ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string &parameter, bool adding)
 192         {
 193                 User* theuser = FounderProtectBase::FindAndVerify(parameter, channel);
 194
 195                 if (!theuser)
 196                 {
 197                         return MODEACTION_DENY;
 198                 }
 199
 200                 if ((!adding) && FounderProtectBase::CanRemoveOthers(source, theuser, channel))
 201                 {
 202                         return FounderProtectBase::HandleChange(source, theuser, adding, channel, parameter);
 203                 }
 204                  // source is a server, or ulined, we'll let them +-q the user.
 205                 if ((unload_kludge) || ((source == theuser) && (!adding) && (FounderProtectBase::remove_own_privs)) || (ServerInstance->ULine(source->nick)) || (ServerInstance->ULine(source->server)) || (!*source->server) || (!IS_LOCAL(source)))
 206                 {
 207                         return FounderProtectBase::HandleChange(source, theuser, adding, channel, parameter);
 208                 }
 209                 else
 210                 {
 211                         // whoops, someones being naughty!
 212                         source->WriteServ("468 %s %s :Only servers may set channel mode +q",source->nick, channel->name);
 213                         parameter.clear();
 214                         return MODEACTION_DENY;
 215                 }
 216         }
 217
 218         void DisplayList(User* user, Channel* channel)
 219         {
 220                 FounderProtectBase::DisplayList(user,channel);
 221         }
 222 };
 223
 224 /** Abstraction of FounderProtectBase for channel mode +a
 225  */
 226 class ChanProtect : public ModeHandler, public FounderProtectBase
 227 {
 228         char* dummyptr;
 229  public:
 230         ChanProtect(InspIRCd* Instance, bool using_prefixes, bool &depriv_self, bool &depriv_others)
 231                 : ModeHandler(Instance, 'a', 1, 1, true, MODETYPE_CHANNEL, false, using_prefixes ? '&' : 0),
 232                   FounderProtectBase(Instance,"cm_protect_","protected user", 388, 389, depriv_self, depriv_others) { }
 233
 234         unsigned int GetPrefixRank()
 235         {
 236                 return PROTECT_VALUE;
 237         }
 238
 239         ModePair ModeSet(User* source, User* dest, Channel* channel, const std::string &parameter)
 240         {
 241                 return FounderProtectBase::ModeSet(source, dest, channel, parameter);
 242         }
 243
 244         void RemoveMode(Channel* channel)
 245         {
 246                 FounderProtectBase::RemoveMode(channel, this->GetModeChar());
 247         }
 248
 249         void RemoveMode(User* user)
 250         {
 251         }
 252
 253         ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string &parameter, bool adding)
 254         {
 255                 User* theuser = FounderProtectBase::FindAndVerify(parameter, channel);
 256
 257                 if (!theuser)
 258                         return MODEACTION_DENY;
 259
 260                 std::string founder = "cm_founder_"+std::string(channel->name);
 261
 262                 if ((!adding) && FounderProtectBase::CanRemoveOthers(source, theuser, channel))
 263                 {
 264                         return FounderProtectBase::HandleChange(source, theuser, adding, channel, parameter);
 265                 }
 266                 // source has +q, is a server, or ulined, we'll let them +-a the user.
 267                 if ((unload_kludge) || ((source == theuser) && (!adding) && (FounderProtectBase::remove_own_privs)) || (ServerInstance->ULine(source->nick)) || (ServerInstance->ULine(source->server)) || (!*source->server) || (source->GetExt(founder,dummyptr)) || (!IS_LOCAL(source)))
 268                 {
 269                         return FounderProtectBase::HandleChange(source, theuser, adding, channel, parameter);
 270                 }
 271                 else
 272                 {
 273                         // bzzzt, wrong answer!
 274                         source->WriteServ("482 %s %s :You are not a channel founder",source->nick, channel->name);
 275                         return MODEACTION_DENY;
 276                 }
 277         }
 278
 279         virtual void DisplayList(User* user, Channel* channel)
 280         {
 281                 FounderProtectBase::DisplayList(user, channel);
 282         }
 283
 284 };
 285
 286 class ModuleChanProtect : public Module
 287 {
 288
 289         bool FirstInGetsFounder;
 290         bool QAPrefixes;
 291         bool DeprivSelf;
 292         bool DeprivOthers;
 293         bool booting;
 294         ChanProtect* cp;
 295         ChanFounder* cf;
 296         char* dummyptr;
 297
 298  public:
 299
 300         ModuleChanProtect(InspIRCd* Me)
 301                 : Module(Me), FirstInGetsFounder(false), QAPrefixes(false), DeprivSelf(false), DeprivOthers(false), booting(true)
 302         {
 303                 /* Load config stuff */
 304                 OnRehash(NULL,"");
 305                 booting = false;
 306
 307                 /* Initialise module variables */
 308
 309                 cp = new ChanProtect(ServerInstance,QAPrefixes,DeprivSelf,DeprivOthers);
 310                 cf = new ChanFounder(ServerInstance,QAPrefixes,DeprivSelf,DeprivOthers);
 311
 312                 if (!ServerInstance->AddMode(cp) || !ServerInstance->AddMode(cf))
 313                         throw ModuleException("Could not add new modes!");
 314                 Implementation eventlist[] = { I_OnUserKick, I_OnUserPart, I_OnRehash, I_OnUserPreJoin, I_OnPostJoin, I_OnAccessCheck, I_OnSyncChannel };
 315                 ServerInstance->Modules->Attach(eventlist, this, 7);
 316         }
 317
 318         void Implements(char* List)
 319         {
 320                 List[I_OnUserKick] = List[I_OnUserPart] = List[I_OnRehash] = List[I_OnUserPreJoin] = List[I_OnPostJoin] = List[I_OnAccessCheck] = List[I_OnSyncChannel] = 1;
 321         }
 322
 323         virtual void OnUserKick(User* source, User* user, Channel* chan, const std::string &reason, bool &silent)
 324         {
 325                 // FIX: when someone gets kicked from a channel we must remove their Extensibles!
 326                 user->Shrink("cm_founder_"+std::string(chan->name));
 327                 user->Shrink("cm_protect_"+std::string(chan->name));
 328         }
 329
 330         virtual void OnUserPart(User* user, Channel* channel, const std::string &partreason, bool &silent)
 331         {
 332                 // FIX: when someone parts a channel we must remove their Extensibles!
 333                 user->Shrink("cm_founder_"+std::string(channel->name));
 334                 user->Shrink("cm_protect_"+std::string(channel->name));
 335         }
 336
 337         virtual void OnRehash(User* user, const std::string &parameter)
 338         {
 339                 /* Create a configreader class and read our flag,
 340                  * in old versions this was heap-allocated and the
 341                  * object was kept between rehashes...now we just
 342                  * stack-allocate it locally.
 343                  */
 344                 ConfigReader Conf(ServerInstance);
 345
 346                 bool old_qa = QAPrefixes;
 347
 348                 FirstInGetsFounder = Conf.ReadFlag("options","noservices",0);
 349                 QAPrefixes = Conf.ReadFlag("options","qaprefixes",0);
 350                 DeprivSelf = Conf.ReadFlag("options","deprotectself",0);
 351                 DeprivOthers = Conf.ReadFlag("options","deprotectothers",0);
 352
 353                 /* Did the user change the QA prefixes on the fly?
 354                  * If so, remove all instances of the mode, and reinit
 355                  * the module with prefixes enabled.
 356                  */
 357                 if ((old_qa != QAPrefixes) && (!booting))
 358                 {
 359                         ServerInstance->Modes->DelMode(cp);
 360                         ServerInstance->Modes->DelMode(cf);
 361                         delete cp;
 362                         delete cf;
 363                         cp = new ChanProtect(ServerInstance,QAPrefixes,DeprivSelf,DeprivOthers);
 364                         cf = new ChanFounder(ServerInstance,QAPrefixes,DeprivSelf,DeprivOthers);
 365                         /* These wont fail, we already owned the mode characters before */
 366                         ServerInstance->AddMode(cp);
 367                         ServerInstance->AddMode(cf);
 368                         ServerInstance->WriteOpers("*** WARNING: +qa prefixes were enabled or disabled via a REHASH. Clients will probably need to reconnect to pick up this change.");
 369                 }
 370         }
 371
 372         virtual int OnUserPreJoin(User *user, Channel *chan, const char *cname, std::string &privs)
 373         {
 374                 // if the user is the first user into the channel, mark them as the founder, but only if
 375                 // the config option for it is set
 376
 377                 if (FirstInGetsFounder && !chan)
 378                         privs = "~@";
 379
 380                 return 0;
 381         }
 382
 383         virtual void OnPostJoin(User *user, Channel *channel)
 384         {
 385                 // This *must* be in PostJoin, not UserJoin - the former will make it appear to happen
 386                 // before the client is in the channel
 387
 388                 // This notice was here originally because it was all done prior to the creation of
 389                 // privs in OnUserPreJoin. I've left it because it might still be wanted, but i'm
 390                 // not sure it really should be here - ops don't get shown, obviously, and the prefix
 391                 // will appear in the names list for the user.. remove if desired -Special
 392
 393                 if (FirstInGetsFounder && channel->GetUserCounter() == 1)
 394                         user->WriteServ("MODE %s +q %s", channel->name, user->nick);
 395         }
 396
 397         virtual int OnAccessCheck(User* source,User* dest,Channel* channel,int access_type)
 398         {
 399                 // here we perform access checks, this is the important bit that actually stops kicking/deopping
 400                 // etc of protected users. There are many types of access check, we're going to handle
 401                 // a relatively small number of them relevent to our module using a switch statement.
 402                 // don't allow action if:
 403                 // (A) Theyre founder (no matter what)
 404                 // (B) Theyre protected, and you're not
 405                 // always allow the action if:
 406                 // (A) The source is ulined
 407
 408
 409                 // firstly, if a ulined nick, or a server, is setting the mode, then allow them to set the mode
 410                 // without any access checks, we're not worthy :p
 411                 if ((ServerInstance->ULine(source->nick)) || (ServerInstance->ULine(source->server)) || (!*source->server))
 412                         return ACR_ALLOW;
 413
 414                 std::string founder = "cm_founder_"+std::string(channel->name);
 415                 std::string protect = "cm_protect_"+std::string(channel->name);
 416
 417                 switch (access_type)
 418                 {
 419                         // a user has been deopped. Do we let them? hmmm...
 420                         case AC_DEOP:
 421                                 if (dest->GetExt(founder,dummyptr))
 422                                 {
 423                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't deop "+std::string(dest->nick)+" as they're a channel founder");
 424                                         return ACR_DENY;
 425                                 }
 426                                 if ((dest->GetExt(protect,dummyptr)) && (!source->GetExt(protect,dummyptr)))
 427                                 {
 428                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't deop "+std::string(dest->nick)+" as they're protected (+a)");
 429                                         return ACR_DENY;
 430                                 }
 431                         break;
 432
 433                         // a user is being kicked. do we chop off the end of the army boot?
 434                         case AC_KICK:
 435                                 if (dest->GetExt(founder,dummyptr))
 436                                 {
 437                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't kick "+std::string(dest->nick)+" as they're a channel founder");
 438                                         return ACR_DENY;
 439                                 }
 440                                 if ((dest->GetExt(protect,dummyptr)) && (!source->GetExt(protect,dummyptr)))
 441                                 {
 442                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't kick "+std::string(dest->nick)+" as they're protected (+a)");
 443                                         return ACR_DENY;
 444                                 }
 445                         break;
 446
 447                         // a user is being dehalfopped. Yes, we do disallow -h of a +ha user
 448                         case AC_DEHALFOP:
 449                                 if (dest->GetExt(founder,dummyptr))
 450                                 {
 451                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't de-halfop "+std::string(dest->nick)+" as they're a channel founder");
 452                                         return ACR_DENY;
 453                                 }
 454                                 if ((dest->GetExt(protect,dummyptr)) && (!source->GetExt(protect,dummyptr)))
 455                                 {
 456                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't de-halfop "+std::string(dest->nick)+" as they're protected (+a)");
 457                                         return ACR_DENY;
 458                                 }
 459                         break;
 460
 461                         // same with devoice.
 462                         case AC_DEVOICE:
 463                                 if (dest->GetExt(founder,dummyptr))
 464                                 {
 465                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't devoice "+std::string(dest->nick)+" as they're a channel founder");
 466                                         return ACR_DENY;
 467                                 }
 468                                 if ((dest->GetExt(protect,dummyptr)) && (!source->GetExt(protect,dummyptr)))
 469                                 {
 470                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't devoice "+std::string(dest->nick)+" as they're protected (+a)");
 471                                         return ACR_DENY;
 472                                 }
 473                         break;
 474                 }
 475
 476                 // we dont know what this access check is, or dont care. just carry on, nothing to see here.
 477                 return ACR_DEFAULT;
 478         }
 479
 480         virtual ~ModuleChanProtect()
 481         {
 482                 ServerInstance->Modes->DelMode(cp);
 483                 ServerInstance->Modes->DelMode(cf);
 484                 delete cp;
 485                 delete cf;
 486         }
 487
 488         virtual Version GetVersion()
 489         {
 490                 return Version(1, 1, 0, 0, VF_COMMON | VF_VENDOR, API_VERSION);
 491         }
 492
 493         virtual void OnSyncChannel(Channel* chan, Module* proto, void* opaque)
 494         {
 495                 /* NOTE: If +qa prefix is on, this is propagated by the channel join,
 496                  * so we dont need to propagate it manually
 497                  */
 498                 if (!QAPrefixes)
 499                 {
 500                         // this is called when the server is linking into a net and wants to sync channel data.
 501                         // we should send our mode changes for the channel here to ensure that other servers
 502                         // know whos +q/+a on the channel.
 503                         CUList* cl = chan->GetUsers();
 504                         string_list commands;
 505                         std::string founder = "cm_founder_"+std::string(chan->name);
 506                         std::string protect = "cm_protect_"+std::string(chan->name);
 507                         irc::modestacker modestack(true);
 508                         std::deque<std::string> stackresult;
 509                         for (CUList::iterator i = cl->begin(); i != cl->end(); i++)
 510                         {
 511                                 if (i->first->GetExt(founder,dummyptr))
 512                                 {
 513                                         modestack.Push('q',i->first->nick);
 514                                 }
 515                                 if (i->first->GetExt(protect,dummyptr))
 516                                 {
 517                                         modestack.Push('a',i->first->nick);
 518                                 }
 519                         }
 520                         while (modestack.GetStackedLine(stackresult))
 521                         {
 522                                 irc::stringjoiner mode_join(" ", stackresult, 0, stackresult.size() - 1);
 523                                 std::string line = mode_join.GetJoined();
 524                                 proto->ProtoSendMode(opaque,TYPE_CHANNEL,chan, line);
 525                         }
 526                 }
 527         }
 528
 529 };
 530
 531 MODULE_INIT(ModuleChanProtect)