src/modules/m_dccallow.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2008 John Brooks <john.brooks@dereferenced.net>
   6  *   Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
   7  *   Copyright (C) 2006-2008 Craig Edwards <craigedwards@brainbox.cc>
   8  *   Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
   9  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
  10  *   Copyright (C) 2006 Jamie ??? <???@???>
  11  *
  12  * This file is part of InspIRCd.  InspIRCd is free software: you can
  13  * redistribute it and/or modify it under the terms of the GNU General Public
  14  * License as published by the Free Software Foundation, version 2.
  15  *
  16  * This program is distributed in the hope that it will be useful, but WITHOUT
  17  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  18  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  19  * details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23  */
  24
  25
  26 #include "inspircd.h"
  27
  28 /* $ModDesc: Provides support for the /DCCALLOW command */
  29
  30 class BannedFileList
  31 {
  32  public:
  33         std::string filemask;
  34         std::string action;
  35 };
  36
  37 class DCCAllow
  38 {
  39  public:
  40         std::string nickname;
  41         std::string hostmask;
  42         time_t set_on;
  43         long length;
  44
  45         DCCAllow() { }
  46
  47         DCCAllow(const std::string &nick, const std::string &hm, const time_t so, const long ln) : nickname(nick), hostmask(hm), set_on(so), length(ln) { }
  48 };
  49
  50 typedef std::vector<User *> userlist;
  51 userlist ul;
  52 typedef std::vector<DCCAllow> dccallowlist;
  53 dccallowlist* dl;
  54 typedef std::vector<BannedFileList> bannedfilelist;
  55 bannedfilelist bfl;
  56 SimpleExtItem<dccallowlist>* ext;
  57
  58 class CommandDccallow : public Command
  59 {
  60  public:
  61         CommandDccallow(Module* parent) : Command(parent, "DCCALLOW", 0)
  62         {
  63                 syntax = "[(+|-)<nick> [<time>]]|[LIST|HELP]";
  64                 /* XXX we need to fix this so it can work with translation stuff (i.e. move +- into a seperate param */
  65         }
  66
  67         CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  68         {
  69                 /* syntax: DCCALLOW [+|-]<nick> (<time>) */
  70                 if (!parameters.size())
  71                 {
  72                         // display current DCCALLOW list
  73                         DisplayDCCAllowList(user);
  74                         return CMD_FAILURE;
  75                 }
  76                 else if (parameters.size() > 0)
  77                 {
  78                         char action = *parameters[0].c_str();
  79
  80                         // if they didn't specify an action, this is probably a command
  81                         if (action != '+' && action != '-')
  82                         {
  83                                 if (!strcasecmp(parameters[0].c_str(), "LIST"))
  84                                 {
  85                                         // list current DCCALLOW list
  86                                         DisplayDCCAllowList(user);
  87                                         return CMD_FAILURE;
  88                                 }
  89                                 else if (!strcasecmp(parameters[0].c_str(), "HELP"))
  90                                 {
  91                                         // display help
  92                                         DisplayHelp(user);
  93                                         return CMD_FAILURE;
  94                                 }
  95                                 else
  96                                 {
  97                                         user->WriteNumeric(998, "%s :DCCALLOW command not understood. For help on DCCALLOW, type /DCCALLOW HELP", user->nick.c_str());
  98                                         return CMD_FAILURE;
  99                                 }
 100                         }
 101
 102                         std::string nick = parameters[0].substr(1);
 103                         User *target = ServerInstance->FindNickOnly(nick);
 104
 105                         if ((target) && (!IS_SERVER(target)) && (!target->quitting) && (target->registered == REG_ALL))
 106                         {
 107
 108                                 if (action == '-')
 109                                 {
 110                                         // check if it contains any entries
 111                                         dl = ext->get(user);
 112                                         if (dl)
 113                                         {
 114                                                 for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 115                                                 {
 116                                                         // search through list
 117                                                         if (i->nickname == target->nick)
 118                                                         {
 119                                                                 dl->erase(i);
 120                                                                 user->WriteNumeric(995, "%s %s :Removed %s from your DCCALLOW list", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 121                                                                 break;
 122                                                         }
 123                                                 }
 124                                         }
 125                                 }
 126                                 else if (action == '+')
 127                                 {
 128                                         if (target == user)
 129                                         {
 130                                                 user->WriteNumeric(996, "%s %s :You cannot add yourself to your own DCCALLOW list!", user->nick.c_str(), user->nick.c_str());
 131                                                 return CMD_FAILURE;
 132                                         }
 133
 134                                         dl = ext->get(user);
 135                                         if (!dl)
 136                                         {
 137                                                 dl = new dccallowlist;
 138                                                 ext->set(user, dl);
 139                                                 // add this user to the userlist
 140                                                 ul.push_back(user);
 141                                         }
 142
 143                                         for (dccallowlist::const_iterator k = dl->begin(); k != dl->end(); ++k)
 144                                         {
 145                                                 if (k->nickname == target->nick)
 146                                                 {
 147                                                         user->WriteNumeric(996, "%s %s :%s is already on your DCCALLOW list", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 148                                                         return CMD_FAILURE;
 149                                                 }
 150                                         }
 151
 152                                         std::string mask = target->nick+"!"+target->ident+"@"+target->dhost;
 153                                         std::string default_length = ServerInstance->Config->ConfValue("dccallow")->getString("length");
 154
 155                                         long length;
 156                                         if (parameters.size() < 2)
 157                                         {
 158                                                 length = ServerInstance->Duration(default_length);
 159                                         }
 160                                         else if (!atoi(parameters[1].c_str()))
 161                                         {
 162                                                 length = 0;
 163                                         }
 164                                         else
 165                                         {
 166                                                 length = ServerInstance->Duration(parameters[1]);
 167                                         }
 168
 169                                         if (!ServerInstance->IsValidMask(mask))
 170                                         {
 171                                                 return CMD_FAILURE;
 172                                         }
 173
 174                                         dl->push_back(DCCAllow(target->nick, mask, ServerInstance->Time(), length));
 175
 176                                         if (length > 0)
 177                                         {
 178                                                 user->WriteNumeric(993, "%s %s :Added %s to DCCALLOW list for %ld seconds", user->nick.c_str(), user->nick.c_str(), target->nick.c_str(), length);
 179                                         }
 180                                         else
 181                                         {
 182                                                 user->WriteNumeric(994, "%s %s :Added %s to DCCALLOW list for this session", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 183                                         }
 184
 185                                         /* route it. */
 186                                         return CMD_SUCCESS;
 187                                 }
 188                         }
 189                         else
 190                         {
 191                                 // nick doesn't exist
 192                                 user->WriteNumeric(401, "%s %s :No such nick/channel", user->nick.c_str(), nick.c_str());
 193                                 return CMD_FAILURE;
 194                         }
 195                 }
 196                 return CMD_FAILURE;
 197         }
 198
 199         RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
 200         {
 201                 return ROUTE_BROADCAST;
 202         }
 203
 204         void DisplayHelp(User* user)
 205         {
 206                 user->WriteNumeric(998, "%s :DCCALLOW [(+|-)<nick> [<time>]]|[LIST|HELP]", user->nick.c_str());
 207                 user->WriteNumeric(998, "%s :You may allow DCCs from specific users by specifying a", user->nick.c_str());
 208                 user->WriteNumeric(998, "%s :DCC allow for the user you want to receive DCCs from.", user->nick.c_str());
 209                 user->WriteNumeric(998, "%s :For example, to allow the user Brain to send you inspircd.exe", user->nick.c_str());
 210                 user->WriteNumeric(998, "%s :you would type:", user->nick.c_str());
 211                 user->WriteNumeric(998, "%s :/DCCALLOW +Brain", user->nick.c_str());
 212                 user->WriteNumeric(998, "%s :Brain would then be able to send you files. They would have to", user->nick.c_str());
 213                 user->WriteNumeric(998, "%s :resend the file again if the server gave them an error message", user->nick.c_str());
 214                 user->WriteNumeric(998, "%s :before you added them to your DCCALLOW list.", user->nick.c_str());
 215                 user->WriteNumeric(998, "%s :DCCALLOW entries will be temporary by default, if you want to add", user->nick.c_str());
 216                 user->WriteNumeric(998, "%s :them to your DCCALLOW list until you leave IRC, type:", user->nick.c_str());
 217                 user->WriteNumeric(998, "%s :/DCCALLOW +Brain 0", user->nick.c_str());
 218                 user->WriteNumeric(998, "%s :To remove the user from your DCCALLOW list, type:", user->nick.c_str());
 219                 user->WriteNumeric(998, "%s :/DCCALLOW -Brain", user->nick.c_str());
 220                 user->WriteNumeric(998, "%s :To see the users in your DCCALLOW list, type:", user->nick.c_str());
 221                 user->WriteNumeric(998, "%s :/DCCALLOW LIST", user->nick.c_str());
 222                 user->WriteNumeric(998, "%s :NOTE: If the user leaves IRC or changes their nickname", user->nick.c_str());
 223                 user->WriteNumeric(998, "%s :  they will be removed from your DCCALLOW list.", user->nick.c_str());
 224                 user->WriteNumeric(998, "%s :  your DCCALLOW list will be deleted when you leave IRC.", user->nick.c_str());
 225                 user->WriteNumeric(999, "%s :End of DCCALLOW HELP", user->nick.c_str());
 226
 227                 LocalUser* localuser = IS_LOCAL(user);
 228                 if (localuser)
 229                         localuser->CommandFloodPenalty += 4000;
 230         }
 231
 232         void DisplayDCCAllowList(User* user)
 233         {
 234                  // display current DCCALLOW list
 235                 user->WriteNumeric(990, "%s :Users on your DCCALLOW list:", user->nick.c_str());
 236
 237                 dl = ext->get(user);
 238                 if (dl)
 239                 {
 240                         for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 241                         {
 242                                 user->WriteNumeric(991, "%s %s :%s (%s)", user->nick.c_str(), user->nick.c_str(), c->nickname.c_str(), c->hostmask.c_str());
 243                         }
 244                 }
 245
 246                 user->WriteNumeric(992, "%s :End of DCCALLOW list", user->nick.c_str());
 247         }
 248
 249 };
 250
 251 class ModuleDCCAllow : public Module
 252 {
 253         CommandDccallow cmd;
 254  public:
 255
 256         ModuleDCCAllow()
 257                 : cmd(this)
 258         {
 259                 ext = NULL;
 260         }
 261
 262         void init()
 263         {
 264                 ext = new SimpleExtItem<dccallowlist>("dccallow", this);
 265                 ServerInstance->Modules->AddService(*ext);
 266                 ServerInstance->Modules->AddService(cmd);
 267                 ReadFileConf();
 268                 Implementation eventlist[] = { I_OnUserPreMessage, I_OnUserPreNotice, I_OnUserQuit, I_OnUserPostNick, I_OnRehash };
 269                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 270         }
 271
 272         virtual void OnRehash(User* user)
 273         {
 274                 ReadFileConf();
 275         }
 276
 277         virtual void OnUserQuit(User* user, const std::string &reason, const std::string &oper_message)
 278         {
 279                 dccallowlist* udl = ext->get(user);
 280
 281                 // remove their DCCALLOW list if they have one
 282                 if (udl)
 283                 {
 284                         userlist::iterator it = std::find(ul.begin(), ul.end(), user);
 285                         if (it != ul.end())
 286                                 ul.erase(it);
 287                 }
 288
 289                 // remove them from any DCCALLOW lists
 290                 // they are currently on
 291                 RemoveNick(user);
 292         }
 293
 294         virtual void OnUserPostNick(User* user, const std::string &oldnick)
 295         {
 296                 RemoveNick(user);
 297         }
 298
 299         virtual ModResult OnUserPreMessage(User* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 300         {
 301                 return OnUserPreNotice(user, dest, target_type, text, status, exempt_list);
 302         }
 303
 304         virtual ModResult OnUserPreNotice(User* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 305         {
 306                 if (!IS_LOCAL(user))
 307                         return MOD_RES_PASSTHRU;
 308
 309                 if (target_type == TYPE_USER)
 310                 {
 311                         User* u = (User*)dest;
 312
 313                         /* Always allow a user to dcc themselves (although... why?) */
 314                         if (user == u)
 315                                 return MOD_RES_PASSTHRU;
 316
 317                         if ((text.length()) && (text[0] == '\1'))
 318                         {
 319                                 Expire();
 320
 321                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 322                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 323
 324                                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 325                                 {
 326                                         dl = ext->get(u);
 327                                         if (dl && dl->size())
 328                                         {
 329                                                 for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 330                                                         if (InspIRCd::Match(user->GetFullHost(), iter->hostmask))
 331                                                                 return MOD_RES_PASSTHRU;
 332                                         }
 333
 334                                         // tokenize
 335                                         std::stringstream ss(text);
 336                                         std::string buf;
 337                                         std::vector<std::string> tokens;
 338
 339                                         while (ss >> buf)
 340                                                 tokens.push_back(buf);
 341
 342                                         if (tokens.size() < 2)
 343                                                 return MOD_RES_PASSTHRU;
 344
 345                                         irc::string type = tokens[1].c_str();
 346
 347                                         ConfigTag* conftag = ServerInstance->Config->ConfValue("dccallow");
 348                                         bool blockchat = conftag->getBool("blockchat");
 349
 350                                         if (type == "SEND")
 351                                         {
 352                                                 if (tokens.size() < 3)
 353                                                         return MOD_RES_PASSTHRU;
 354
 355                                                 std::string defaultaction = conftag->getString("action");
 356                                                 std::string filename = tokens[2];
 357
 358                                                 bool found = false;
 359                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 360                                                 {
 361                                                         if (InspIRCd::Match(filename, bfl[i].filemask, ascii_case_insensitive_map))
 362                                                         {
 363                                                                 /* We have a matching badfile entry, override whatever the default action is */
 364                                                                 if (bfl[i].action == "allow")
 365                                                                         return MOD_RES_PASSTHRU;
 366                                                                 else
 367                                                                 {
 368                                                                         found = true;
 369                                                                         break;
 370                                                                 }
 371                                                         }
 372                                                 }
 373
 374                                                 /* only follow the default action if no badfile matches were found above */
 375                                                 if ((!found) && (defaultaction == "allow"))
 376                                                         return MOD_RES_PASSTHRU;
 377
 378                                                 user->WriteServ("NOTICE %s :The user %s is not accepting DCC SENDs from you. Your file %s was not sent.", user->nick.c_str(), u->nick.c_str(), filename.c_str());
 379                                                 u->WriteServ("NOTICE %s :%s (%s@%s) attempted to send you a file named %s, which was blocked.", u->nick.c_str(), user->nick.c_str(), user->ident.c_str(), user->dhost.c_str(), filename.c_str());
 380                                                 u->WriteServ("NOTICE %s :If you trust %s and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.", u->nick.c_str(), user->nick.c_str());
 381                                                 return MOD_RES_DENY;
 382                                         }
 383                                         else if ((type == "CHAT") && (blockchat))
 384                                         {
 385                                                 user->WriteServ("NOTICE %s :The user %s is not accepting DCC CHAT requests from you.", user->nick.c_str(), u->nick.c_str());
 386                                                 u->WriteServ("NOTICE %s :%s (%s@%s) attempted to initiate a DCC CHAT session, which was blocked.", u->nick.c_str(), user->nick.c_str(), user->ident.c_str(), user->dhost.c_str());
 387                                                 u->WriteServ("NOTICE %s :If you trust %s and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.", u->nick.c_str(), user->nick.c_str());
 388                                                 return MOD_RES_DENY;
 389                                         }
 390                                 }
 391                         }
 392                 }
 393                 return MOD_RES_PASSTHRU;
 394         }
 395
 396         void Expire()
 397         {
 398                 for (userlist::iterator iter = ul.begin(); iter != ul.end();)
 399                 {
 400                         User* u = (User*)(*iter);
 401                         dl = ext->get(u);
 402                         if (dl)
 403                         {
 404                                 if (dl->size())
 405                                 {
 406                                         dccallowlist::iterator iter2 = dl->begin();
 407                                         while (iter2 != dl->end())
 408                                         {
 409                                                 if (iter2->length != 0 && (iter2->set_on + iter2->length) <= ServerInstance->Time())
 410                                                 {
 411                                                         u->WriteNumeric(997, "%s %s :DCCALLOW entry for %s has expired", u->nick.c_str(), u->nick.c_str(), iter2->nickname.c_str());
 412                                                         iter2 = dl->erase(iter2);
 413                                                 }
 414                                                 else
 415                                                 {
 416                                                         ++iter2;
 417                                                 }
 418                                         }
 419                                 }
 420                                 ++iter;
 421                         }
 422                         else
 423                         {
 424                                 iter = ul.erase(iter);
 425                         }
 426                 }
 427         }
 428
 429         void RemoveNick(User* user)
 430         {
 431                 /* Iterate through all DCCALLOW lists and remove user */
 432                 for (userlist::iterator iter = ul.begin(); iter != ul.end();)
 433                 {
 434                         User *u = (User*)(*iter);
 435                         dl = ext->get(u);
 436                         if (dl)
 437                         {
 438                                 if (dl->size())
 439                                 {
 440                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 441                                         {
 442                                                 if (i->nickname == user->nick)
 443                                                 {
 444
 445                                                         u->WriteServ("NOTICE %s :%s left the network or changed their nickname and has been removed from your DCCALLOW list", u->nick.c_str(), i->nickname.c_str());
 446                                                         u->WriteNumeric(995, "%s %s :Removed %s from your DCCALLOW list", u->nick.c_str(), u->nick.c_str(), i->nickname.c_str());
 447                                                         dl->erase(i);
 448                                                         break;
 449                                                 }
 450                                         }
 451                                 }
 452                                 ++iter;
 453                         }
 454                         else
 455                         {
 456                                 iter = ul.erase(iter);
 457                         }
 458                 }
 459         }
 460
 461         void RemoveFromUserlist(User *user)
 462         {
 463                 // remove user from userlist
 464                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 465                 {
 466                         User* u = (User*)(*j);
 467                         if (u == user)
 468                         {
 469                                 ul.erase(j);
 470                                 break;
 471                         }
 472                 }
 473         }
 474
 475         void ReadFileConf()
 476         {
 477                 bfl.clear();
 478                 ConfigTagList tags = ServerInstance->Config->ConfTags("banfile");
 479                 for (ConfigIter i = tags.first; i != tags.second; ++i)
 480                 {
 481                         BannedFileList bf;
 482                         bf.filemask = i->second->getString("pattern");
 483                         bf.action = i->second->getString("action");
 484                         bfl.push_back(bf);
 485                 }
 486         }
 487
 488         virtual ~ModuleDCCAllow()
 489         {
 490                 delete ext;
 491         }
 492
 493         virtual Version GetVersion()
 494         {
 495                 return Version("Provides support for the /DCCALLOW command", VF_COMMON | VF_VENDOR);
 496         }
 497 };
 498
 499 MODULE_INIT(ModuleDCCAllow)