src/modules/m_chanprotect.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                     E-mail:
   7  *              <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *          the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 #include "users.h"
  18 #include "channels.h"
  19 #include "modules.h"
  20 #include "inspircd.h"
  21
  22 /* $ModDesc: Provides channel modes +a and +q */
  23 /* $ModDep: ../../include/u_listmode.h */
  24
  25 #define PROTECT_VALUE 40000
  26 #define FOUNDER_VALUE 50000
  27
  28 const char* fakevalue = "on";
  29
  30 /* When this is set to true, no restrictions apply to setting or
  31  * removal of +qa. This is used while unloading so that the server
  32  * can freely clear all of its users of the modes.
  33  */
  34 bool unload_kludge = false;
  35
  36 /** Handles basic operation of +qa channel modes
  37  */
  38 class FounderProtectBase
  39 {
  40  private:
  41         InspIRCd* MyInstance;
  42         std::string extend;
  43         std::string type;
  44         int list;
  45         int end;
  46         char* dummyptr;
  47  public:
  48         FounderProtectBase(InspIRCd* Instance, const std::string &ext, const std::string &mtype, int l, int e) : MyInstance(Instance), extend(ext), type(mtype), list(l), end(e)
  49         {
  50         }
  51
  52         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
  53         {
  54                 userrec* x = MyInstance->FindNick(parameter);
  55                 if (x)
  56                 {
  57                         if (!channel->HasUser(x))
  58                         {
  59                                 return std::make_pair(false, parameter);
  60                         }
  61                         else
  62                         {
  63                                 std::string item = extend+std::string(channel->name);
  64                                 if (x->GetExt(item,dummyptr))
  65                                 {
  66                                         return std::make_pair(true, x->nick);
  67                                 }
  68                                 else
  69                                 {
  70                                         return std::make_pair(false, parameter);
  71                                 }
  72                         }
  73                 }
  74                 return std::make_pair(false, parameter);
  75         }
  76
  77         void RemoveMode(chanrec* channel, char mc)
  78         {
  79                 unload_kludge = true;
  80                 CUList* cl = channel->GetUsers();
  81                 std::string item = extend + std::string(channel->name);
  82                 const char* mode_junk[MAXMODES+1];
  83                 userrec* n = new userrec(MyInstance);
  84                 n->SetFd(FD_MAGIC_NUMBER);
  85                 mode_junk[0] = channel->name;
  86                 irc::modestacker modestack(false);
  87                 std::deque<std::string> stackresult;
  88                 for (CUList::iterator i = cl->begin(); i != cl->end(); i++)
  89                 {
  90                         if (i->second->GetExt(item, dummyptr))
  91                         {
  92                                 modestack.Push(mc, i->second->nick);
  93                         }
  94                 }
  95
  96                 while (modestack.GetStackedLine(stackresult))
  97                 {
  98                         for (size_t j = 0; j < stackresult.size(); j++)
  99                         {
 100                                 mode_junk[j+1] = stackresult[j].c_str();
 101                         }
 102                         MyInstance->SendMode(mode_junk, stackresult.size() + 1, n);
 103                 }
 104
 105                 delete n;
 106                 unload_kludge = false;
 107         }
 108
 109         void DisplayList(userrec* user, chanrec* channel)
 110         {
 111                 CUList* cl = channel->GetUsers();
 112                 std::string item = extend+std::string(channel->name);
 113                 for (CUList::iterator i = cl->begin(); i != cl->end(); i++)
 114                 {
 115                         if (i->second->GetExt(item, dummyptr))
 116                         {
 117                                 user->WriteServ("%d %s %s %s", list, user->nick, channel->name,i->second->nick);
 118                         }
 119                 }
 120                 user->WriteServ("%d %s %s :End of channel %s list", end, user->nick, channel->name, type.c_str());
 121         }
 122
 123         userrec* FindAndVerify(std::string &parameter, chanrec* channel)
 124         {
 125                 userrec* theuser = MyInstance->FindNick(parameter);
 126                 if ((!theuser) || (!channel->HasUser(theuser)))
 127                 {
 128                         parameter = "";
 129                         return NULL;
 130                 }
 131                 return theuser;
 132         }
 133
 134         ModeAction HandleChange(userrec* source, userrec* theuser, bool adding, chanrec* channel, std::string &parameter)
 135         {
 136                 std::string item = extend+std::string(channel->name);
 137
 138                 if (adding)
 139                 {
 140                         if (!theuser->GetExt(item, dummyptr))
 141                         {
 142                                 theuser->Extend(item, fakevalue);
 143                                 parameter = theuser->nick;
 144                                 return MODEACTION_ALLOW;
 145                         }
 146                 }
 147                 else
 148                 {
 149                         if (theuser->GetExt(item, dummyptr))
 150                         {
 151                                 theuser->Shrink(item);
 152                                 parameter = theuser->nick;
 153                                 return MODEACTION_ALLOW;
 154                         }
 155                 }
 156                 return MODEACTION_DENY;
 157         }
 158 };
 159
 160 /** Abstraction of FounderProtectBase for channel mode +q
 161  */
 162 class ChanFounder : public ModeHandler, public FounderProtectBase
 163 {
 164         char* dummyptr;
 165  public:
 166         ChanFounder(InspIRCd* Instance, bool using_prefixes)
 167                 : ModeHandler(Instance, 'q', 1, 1, true, MODETYPE_CHANNEL, false, using_prefixes ? '~' : 0),
 168                   FounderProtectBase(Instance, "cm_founder_", "founder", 386, 387) { }
 169
 170         unsigned int GetPrefixRank()
 171         {
 172                 return FOUNDER_VALUE;
 173         }
 174
 175         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
 176         {
 177                 return FounderProtectBase::ModeSet(source, dest, channel, parameter);
 178         }
 179
 180         void RemoveMode(chanrec* channel)
 181         {
 182                 FounderProtectBase::RemoveMode(channel, this->GetModeChar());
 183         }
 184
 185         void RemoveMode(userrec* user)
 186         {
 187         }
 188
 189         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 190         {
 191                 userrec* theuser = FounderProtectBase::FindAndVerify(parameter, channel);
 192
 193                 if (!theuser)
 194                 {
 195                         return MODEACTION_DENY;
 196                 }
 197
 198                  // source is a server, or ulined, we'll let them +-q the user.
 199                 if ((unload_kludge) || (ServerInstance->ULine(source->nick)) || (ServerInstance->ULine(source->server)) || (!*source->server) || (!IS_LOCAL(source)))
 200                 {
 201                         return FounderProtectBase::HandleChange(source, theuser, adding, channel, parameter);
 202                 }
 203                 else
 204                 {
 205                         // whoops, someones being naughty!
 206                         source->WriteServ("468 %s %s :Only servers may set channel mode +q",source->nick, channel->name);
 207                         parameter = "";
 208                         return MODEACTION_DENY;
 209                 }
 210         }
 211
 212         void DisplayList(userrec* user, chanrec* channel)
 213         {
 214                 FounderProtectBase::DisplayList(user,channel);
 215         }
 216 };
 217
 218 /** Abstraction of FounderProtectBase for channel mode +a
 219  */
 220 class ChanProtect : public ModeHandler, public FounderProtectBase
 221 {
 222         char* dummyptr;
 223  public:
 224         ChanProtect(InspIRCd* Instance, bool using_prefixes)
 225                 : ModeHandler(Instance, 'a', 1, 1, true, MODETYPE_CHANNEL, false, using_prefixes ? '&' : 0),
 226                   FounderProtectBase(Instance,"cm_protect_","protected user", 388, 389) { }
 227
 228         unsigned int GetPrefixRank()
 229         {
 230                 return PROTECT_VALUE;
 231         }
 232
 233         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
 234         {
 235                 return FounderProtectBase::ModeSet(source, dest, channel, parameter);
 236         }
 237
 238         void RemoveMode(chanrec* channel)
 239         {
 240                 FounderProtectBase::RemoveMode(channel, this->GetModeChar());
 241         }
 242
 243         void RemoveMode(userrec* user)
 244         {
 245         }
 246
 247         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 248         {
 249                 userrec* theuser = FounderProtectBase::FindAndVerify(parameter, channel);
 250
 251                 if (!theuser)
 252                         return MODEACTION_DENY;
 253
 254                 std::string founder = "cm_founder_"+std::string(channel->name);
 255
 256                 // source has +q, is a server, or ulined, we'll let them +-a the user.
 257                 if ((unload_kludge) || (ServerInstance->ULine(source->nick)) || (ServerInstance->ULine(source->server)) || (!*source->server) || (source->GetExt(founder,dummyptr)) || (!IS_LOCAL(source)))
 258                 {
 259                         return FounderProtectBase::HandleChange(source, theuser, adding, channel, parameter);
 260                 }
 261                 else
 262                 {
 263                         // bzzzt, wrong answer!
 264                         source->WriteServ("482 %s %s :You are not a channel founder",source->nick, channel->name);
 265                         return MODEACTION_DENY;
 266                 }
 267         }
 268
 269         virtual void DisplayList(userrec* user, chanrec* channel)
 270         {
 271                 FounderProtectBase::DisplayList(user, channel);
 272         }
 273
 274 };
 275
 276 class ModuleChanProtect : public Module
 277 {
 278
 279         bool FirstInGetsFounder;
 280         bool QAPrefixes;
 281         bool booting;
 282         ChanProtect* cp;
 283         ChanFounder* cf;
 284         char* dummyptr;
 285
 286  public:
 287
 288         ModuleChanProtect(InspIRCd* Me) : Module::Module(Me)
 289         {
 290                 /* Load config stuff */
 291                 booting = true;
 292                 OnRehash("");
 293                 booting = false;
 294
 295                 /* Initialise module variables */
 296
 297                 cp = new ChanProtect(ServerInstance,QAPrefixes);
 298                 cf = new ChanFounder(ServerInstance,QAPrefixes);
 299
 300                 ServerInstance->AddMode(cp, 'a');
 301                 ServerInstance->AddMode(cf, 'q');
 302         }
 303
 304         void Implements(char* List)
 305         {
 306                 List[I_OnUserKick] = List[I_OnUserPart] = List[I_OnRehash] = List[I_OnUserJoin] = List[I_OnAccessCheck] = List[I_OnSyncChannel] = 1;
 307         }
 308
 309         virtual void OnUserKick(userrec* source, userrec* user, chanrec* chan, const std::string &reason)
 310         {
 311                 // FIX: when someone gets kicked from a channel we must remove their Extensibles!
 312                 user->Shrink("cm_founder_"+std::string(chan->name));
 313                 user->Shrink("cm_protect_"+std::string(chan->name));
 314         }
 315
 316         virtual void OnUserPart(userrec* user, chanrec* channel, const std::string &partreason)
 317         {
 318                 // FIX: when someone parts a channel we must remove their Extensibles!
 319                 user->Shrink("cm_founder_"+std::string(channel->name));
 320                 user->Shrink("cm_protect_"+std::string(channel->name));
 321         }
 322
 323         virtual void OnRehash(const std::string &parameter)
 324         {
 325                 /* Create a configreader class and read our flag,
 326                  * in old versions this was heap-allocated and the
 327                  * object was kept between rehashes...now we just
 328                  * stack-allocate it locally.
 329                  */
 330                 ConfigReader Conf(ServerInstance);
 331
 332                 bool old_qa = QAPrefixes;
 333
 334                 FirstInGetsFounder = Conf.ReadFlag("options","noservices",0);
 335                 QAPrefixes = Conf.ReadFlag("options","qaprefixes",0);
 336
 337                 /* Did the user change the QA prefixes on the fly?
 338                  * If so, remove all instances of the mode, and reinit
 339                  * the module with prefixes enabled.
 340                  */
 341                 if ((old_qa != QAPrefixes) && (!booting))
 342                 {
 343                         ServerInstance->Modes->DelMode(cp);
 344                         ServerInstance->Modes->DelMode(cf);
 345                         DELETE(cp);
 346                         DELETE(cf);
 347                         cp = new ChanProtect(ServerInstance,QAPrefixes);
 348                         cf = new ChanFounder(ServerInstance,QAPrefixes);
 349                         ServerInstance->AddMode(cp, 'a');
 350                         ServerInstance->AddMode(cf, 'q');
 351                         ServerInstance->WriteOpers("*** WARNING: +qa prefixes were enabled or disabled via a REHASH. Clients will probably need to reconnect to pick up this change.");
 352                 }
 353         }
 354
 355         virtual void OnUserJoin(userrec* user, chanrec* channel)
 356         {
 357                 // if the user is the first user into the channel, mark them as the founder, but only if
 358                 // the config option for it is set
 359                 if (FirstInGetsFounder)
 360                 {
 361                         if (channel->GetUserCounter() == 1)
 362                         {
 363                                 // we're using Extensible::Extend to add data into user objects.
 364                                 // this way is best as it adds data thats accessible to other modules
 365                                 // (so long as you document your code properly) without breaking anything
 366                                 // because its encapsulated neatly in a map.
 367
 368                                 // Change requested by katsklaw... when the first in is set to get founder,
 369                                 // to make it clearer that +q has been given, send that one user the +q notice
 370                                 // so that their client's syncronization and their sanity are left intact.
 371                                 user->WriteServ("MODE %s +q %s",channel->name,user->nick);
 372                                 if (user->Extend("cm_founder_"+std::string(channel->name),fakevalue))
 373                                 {
 374                                         ServerInstance->Log(DEBUG,"Marked user "+std::string(user->nick)+" as founder for "+std::string(channel->name));
 375                                 }
 376                         }
 377                 }
 378         }
 379
 380         virtual int OnAccessCheck(userrec* source,userrec* dest,chanrec* channel,int access_type)
 381         {
 382                 // here we perform access checks, this is the important bit that actually stops kicking/deopping
 383                 // etc of protected users. There are many types of access check, we're going to handle
 384                 // a relatively small number of them relevent to our module using a switch statement.
 385
 386                 ServerInstance->Log(DEBUG,"chanprotect OnAccessCheck %d",access_type);
 387                 // don't allow action if:
 388                 // (A) Theyre founder (no matter what)
 389                 // (B) Theyre protected, and you're not
 390                 // always allow the action if:
 391                 // (A) The source is ulined
 392
 393
 394                 // firstly, if a ulined nick, or a server, is setting the mode, then allow them to set the mode
 395                 // without any access checks, we're not worthy :p
 396                 if ((ServerInstance->ULine(source->nick)) || (ServerInstance->ULine(source->server)) || (!*source->server))
 397                 {
 398                         ServerInstance->Log(DEBUG,"chanprotect OnAccessCheck returns ALLOW");
 399                         return ACR_ALLOW;
 400                 }
 401
 402                 std::string founder = "cm_founder_"+std::string(channel->name);
 403                 std::string protect = "cm_protect_"+std::string(channel->name);
 404
 405                 switch (access_type)
 406                 {
 407                         // a user has been deopped. Do we let them? hmmm...
 408                         case AC_DEOP:
 409                                 ServerInstance->Log(DEBUG,"OnAccessCheck AC_DEOP");
 410                                 if (dest->GetExt(founder,dummyptr))
 411                                 {
 412                                         ServerInstance->Log(DEBUG,"Has %s",founder.c_str());
 413                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't deop "+std::string(dest->nick)+" as they're a channel founder");
 414                                         return ACR_DENY;
 415                                 }
 416                                 else
 417                                 {
 418                                         ServerInstance->Log(DEBUG,"Doesnt have %s",founder.c_str());
 419                                 }
 420                                 if ((dest->GetExt(protect,dummyptr)) && (!source->GetExt(protect,dummyptr)))
 421                                 {
 422                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't deop "+std::string(dest->nick)+" as they're protected (+a)");
 423                                         return ACR_DENY;
 424                                 }
 425                         break;
 426
 427                         // a user is being kicked. do we chop off the end of the army boot?
 428                         case AC_KICK:
 429                                 ServerInstance->Log(DEBUG,"OnAccessCheck AC_KICK");
 430                                 if (dest->GetExt(founder,dummyptr))
 431                                 {
 432                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't kick "+std::string(dest->nick)+" as they're a channel founder");
 433                                         return ACR_DENY;
 434                                 }
 435                                 if ((dest->GetExt(protect,dummyptr)) && (!source->GetExt(protect,dummyptr)))
 436                                 {
 437                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't kick "+std::string(dest->nick)+" as they're protected (+a)");
 438                                         return ACR_DENY;
 439                                 }
 440                         break;
 441
 442                         // a user is being dehalfopped. Yes, we do disallow -h of a +ha user
 443                         case AC_DEHALFOP:
 444                                 if (dest->GetExt(founder,dummyptr))
 445                                 {
 446                                         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");
 447                                         return ACR_DENY;
 448                                 }
 449                                 if ((dest->GetExt(protect,dummyptr)) && (!source->GetExt(protect,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 protected (+a)");
 452                                         return ACR_DENY;
 453                                 }
 454                         break;
 455
 456                         // same with devoice.
 457                         case AC_DEVOICE:
 458                                 if (dest->GetExt(founder,dummyptr))
 459                                 {
 460                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't devoice "+std::string(dest->nick)+" as they're a channel founder");
 461                                         return ACR_DENY;
 462                                 }
 463                                 if ((dest->GetExt(protect,dummyptr)) && (!source->GetExt(protect,dummyptr)))
 464                                 {
 465                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't devoice "+std::string(dest->nick)+" as they're protected (+a)");
 466                                         return ACR_DENY;
 467                                 }
 468                         break;
 469                 }
 470
 471                 // we dont know what this access check is, or dont care. just carry on, nothing to see here.
 472                 ServerInstance->Log(DEBUG,"chanprotect OnAccessCheck returns DEFAULT");
 473                 return ACR_DEFAULT;
 474         }
 475
 476         virtual ~ModuleChanProtect()
 477         {
 478                 ServerInstance->Modes->DelMode(cp);
 479                 ServerInstance->Modes->DelMode(cf);
 480                 DELETE(cp);
 481                 DELETE(cf);
 482         }
 483
 484         virtual Version GetVersion()
 485         {
 486                 return Version(1, 1, 0, 0, VF_COMMON | VF_VENDOR, API_VERSION);
 487         }
 488
 489         virtual void OnSyncChannel(chanrec* chan, Module* proto, void* opaque)
 490         {
 491                 /* NOTE: If +qa prefix is on, this is propogated by the channel join,
 492                  * so we dont need to propogate it manually
 493                  */
 494                 if (!QAPrefixes)
 495                 {
 496                         // this is called when the server is linking into a net and wants to sync channel data.
 497                         // we should send our mode changes for the channel here to ensure that other servers
 498                         // know whos +q/+a on the channel.
 499                         CUList* cl = chan->GetUsers();
 500                         string_list commands;
 501                         std::string founder = "cm_founder_"+std::string(chan->name);
 502                         std::string protect = "cm_protect_"+std::string(chan->name);
 503                         irc::modestacker modestack(true);
 504                         std::deque<std::string> stackresult;
 505                         for (CUList::iterator i = cl->begin(); i != cl->end(); i++)
 506                         {
 507                                 if (i->second->GetExt(founder,dummyptr))
 508                                 {
 509                                         modestack.Push('q',i->second->nick);
 510                                 }
 511                                 if (i->second->GetExt(protect,dummyptr))
 512                                 {
 513                                         modestack.Push('a',i->second->nick);
 514                                 }
 515                         }
 516                         while (modestack.GetStackedLine(stackresult))
 517                         {
 518                                 irc::stringjoiner mode_join(" ", stackresult, 0, stackresult.size() - 1);
 519                                 std::string line = mode_join.GetJoined();
 520                                 proto->ProtoSendMode(opaque,TYPE_CHANNEL,chan, line);
 521                         }
 522                 }
 523         }
 524
 525 };
 526
 527
 528 class ModuleChanProtectFactory : public ModuleFactory
 529 {
 530  public:
 531         ModuleChanProtectFactory()
 532         {
 533         }
 534
 535         ~ModuleChanProtectFactory()
 536         {
 537         }
 538
 539         virtual Module * CreateModule(InspIRCd* Me)
 540         {
 541                 return new ModuleChanProtect(Me);
 542         }
 543
 544 };
 545
 546
 547 extern "C" void * init_module( void )
 548 {
 549         return new ModuleChanProtectFactory;
 550 }