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         unsigned int maxentries;
  62         CommandDccallow(Module* parent) : Command(parent, "DCCALLOW", 0)
  63         {
  64                 syntax = "[(+|-)<nick> [<time>]]|[LIST|HELP]";
  65                 /* XXX we need to fix this so it can work with translation stuff (i.e. move +- into a seperate param */
  66         }
  67
  68         CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  69         {
  70                 /* syntax: DCCALLOW [+|-]<nick> (<time>) */
  71                 if (!parameters.size())
  72                 {
  73                         // display current DCCALLOW list
  74                         DisplayDCCAllowList(user);
  75                         return CMD_FAILURE;
  76                 }
  77                 else if (parameters.size() > 0)
  78                 {
  79                         char action = *parameters[0].c_str();
  80
  81                         // if they didn't specify an action, this is probably a command
  82                         if (action != '+' && action != '-')
  83                         {
  84                                 if (!strcasecmp(parameters[0].c_str(), "LIST"))
  85                                 {
  86                                         // list current DCCALLOW list
  87                                         DisplayDCCAllowList(user);
  88                                         return CMD_FAILURE;
  89                                 }
  90                                 else if (!strcasecmp(parameters[0].c_str(), "HELP"))
  91                                 {
  92                                         // display help
  93                                         DisplayHelp(user);
  94                                         return CMD_FAILURE;
  95                                 }
  96                                 else
  97                                 {
  98                                         user->WriteNumeric(998, "%s :DCCALLOW command not understood. For help on DCCALLOW, type /DCCALLOW HELP", user->nick.c_str());
  99                                         return CMD_FAILURE;
 100                                 }
 101                         }
 102
 103                         std::string nick = parameters[0].substr(1);
 104                         User *target = ServerInstance->FindNickOnly(nick);
 105
 106                         if ((target) && (!IS_SERVER(target)) && (!target->quitting) && (target->registered == REG_ALL))
 107                         {
 108
 109                                 if (action == '-')
 110                                 {
 111                                         // check if it contains any entries
 112                                         dl = ext->get(user);
 113                                         if (dl)
 114                                         {
 115                                                 for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 116                                                 {
 117                                                         // search through list
 118                                                         if (i->nickname == target->nick)
 119                                                         {
 120                                                                 dl->erase(i);
 121                                                                 user->WriteNumeric(995, "%s %s :Removed %s from your DCCALLOW list", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 122                                                                 break;
 123                                                         }
 124                                                 }
 125                                         }
 126                                 }
 127                                 else if (action == '+')
 128                                 {
 129                                         if (target == user)
 130                                         {
 131                                                 user->WriteNumeric(996, "%s %s :You cannot add yourself to your own DCCALLOW list!", user->nick.c_str(), user->nick.c_str());
 132                                                 return CMD_FAILURE;
 133                                         }
 134
 135                                         dl = ext->get(user);
 136                                         if (!dl)
 137                                         {
 138                                                 dl = new dccallowlist;
 139                                                 ext->set(user, dl);
 140                                                 // add this user to the userlist
 141                                                 ul.push_back(user);
 142                                         }
 143
 144                                         if (dl->size() >= maxentries)
 145                                         {
 146                                                 user->WriteNumeric(996, "%s %s :Too many nicks on DCCALLOW list", user->nick.c_str(), user->nick.c_str());
 147                                                 return CMD_FAILURE;
 148                                         }
 149
 150                                         for (dccallowlist::const_iterator k = dl->begin(); k != dl->end(); ++k)
 151                                         {
 152                                                 if (k->nickname == target->nick)
 153                                                 {
 154                                                         user->WriteNumeric(996, "%s %s :%s is already on your DCCALLOW list", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 155                                                         return CMD_FAILURE;
 156                                                 }
 157                                         }
 158
 159                                         std::string mask = target->nick+"!"+target->ident+"@"+target->dhost;
 160                                         std::string default_length = ServerInstance->Config->ConfValue("dccallow")->getString("length");
 161
 162                                         long length;
 163                                         if (parameters.size() < 2)
 164                                         {
 165                                                 length = ServerInstance->Duration(default_length);
 166                                         }
 167                                         else if (!atoi(parameters[1].c_str()))
 168                                         {
 169                                                 length = 0;
 170                                         }
 171                                         else
 172                                         {
 173                                                 length = ServerInstance->Duration(parameters[1]);
 174                                         }
 175
 176                                         if (!ServerInstance->IsValidMask(mask))
 177                                         {
 178                                                 return CMD_FAILURE;
 179                                         }
 180
 181                                         dl->push_back(DCCAllow(target->nick, mask, ServerInstance->Time(), length));
 182
 183                                         if (length > 0)
 184                                         {
 185                                                 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);
 186                                         }
 187                                         else
 188                                         {
 189                                                 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());
 190                                         }
 191
 192                                         /* route it. */
 193                                         return CMD_SUCCESS;
 194                                 }
 195                         }
 196                         else
 197                         {
 198                                 // nick doesn't exist
 199                                 user->WriteNumeric(401, "%s %s :No such nick/channel", user->nick.c_str(), nick.c_str());
 200                                 return CMD_FAILURE;
 201                         }
 202                 }
 203                 return CMD_FAILURE;
 204         }
 205
 206         RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
 207         {
 208                 return ROUTE_BROADCAST;
 209         }
 210
 211         void DisplayHelp(User* user)
 212         {
 213                 user->WriteNumeric(998, "%s :DCCALLOW [(+|-)<nick> [<time>]]|[LIST|HELP]", user->nick.c_str());
 214                 user->WriteNumeric(998, "%s :You may allow DCCs from specific users by specifying a", user->nick.c_str());
 215                 user->WriteNumeric(998, "%s :DCC allow for the user you want to receive DCCs from.", user->nick.c_str());
 216                 user->WriteNumeric(998, "%s :For example, to allow the user Brain to send you inspircd.exe", user->nick.c_str());
 217                 user->WriteNumeric(998, "%s :you would type:", user->nick.c_str());
 218                 user->WriteNumeric(998, "%s :/DCCALLOW +Brain", user->nick.c_str());
 219                 user->WriteNumeric(998, "%s :Brain would then be able to send you files. They would have to", user->nick.c_str());
 220                 user->WriteNumeric(998, "%s :resend the file again if the server gave them an error message", user->nick.c_str());
 221                 user->WriteNumeric(998, "%s :before you added them to your DCCALLOW list.", user->nick.c_str());
 222                 user->WriteNumeric(998, "%s :DCCALLOW entries will be temporary by default, if you want to add", user->nick.c_str());
 223                 user->WriteNumeric(998, "%s :them to your DCCALLOW list until you leave IRC, type:", user->nick.c_str());
 224                 user->WriteNumeric(998, "%s :/DCCALLOW +Brain 0", user->nick.c_str());
 225                 user->WriteNumeric(998, "%s :To remove the user from your DCCALLOW list, type:", user->nick.c_str());
 226                 user->WriteNumeric(998, "%s :/DCCALLOW -Brain", user->nick.c_str());
 227                 user->WriteNumeric(998, "%s :To see the users in your DCCALLOW list, type:", user->nick.c_str());
 228                 user->WriteNumeric(998, "%s :/DCCALLOW LIST", user->nick.c_str());
 229                 user->WriteNumeric(998, "%s :NOTE: If the user leaves IRC or changes their nickname", user->nick.c_str());
 230                 user->WriteNumeric(998, "%s :  they will be removed from your DCCALLOW list.", user->nick.c_str());
 231                 user->WriteNumeric(998, "%s :  your DCCALLOW list will be deleted when you leave IRC.", user->nick.c_str());
 232                 user->WriteNumeric(999, "%s :End of DCCALLOW HELP", user->nick.c_str());
 233
 234                 LocalUser* localuser = IS_LOCAL(user);
 235                 if (localuser)
 236                         localuser->CommandFloodPenalty += 4000;
 237         }
 238
 239         void DisplayDCCAllowList(User* user)
 240         {
 241                  // display current DCCALLOW list
 242                 user->WriteNumeric(990, "%s :Users on your DCCALLOW list:", user->nick.c_str());
 243
 244                 dl = ext->get(user);
 245                 if (dl)
 246                 {
 247                         for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 248                         {
 249                                 user->WriteNumeric(991, "%s %s :%s (%s)", user->nick.c_str(), user->nick.c_str(), c->nickname.c_str(), c->hostmask.c_str());
 250                         }
 251                 }
 252
 253                 user->WriteNumeric(992, "%s :End of DCCALLOW list", user->nick.c_str());
 254         }
 255
 256 };
 257
 258 class ModuleDCCAllow : public Module
 259 {
 260         CommandDccallow cmd;
 261  public:
 262
 263         ModuleDCCAllow()
 264                 : cmd(this)
 265         {
 266                 ext = NULL;
 267         }
 268
 269         void init()
 270         {
 271                 ext = new SimpleExtItem<dccallowlist>("dccallow", this);
 272                 ServerInstance->Modules->AddService(*ext);
 273                 ServerInstance->Modules->AddService(cmd);
 274                 OnRehash(NULL);
 275                 Implementation eventlist[] = { I_OnUserPreMessage, I_OnUserPreNotice, I_OnUserQuit, I_OnUserPostNick, I_OnRehash };
 276                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 277         }
 278
 279         virtual void OnRehash(User* user)
 280         {
 281                 ReadFileConf();
 282                 ConfigTag* tag = ServerInstance->Config->ConfValue("dccallow");
 283                 cmd.maxentries = tag->getInt("maxentries", 20);
 284         }
 285
 286         virtual void OnUserQuit(User* user, const std::string &reason, const std::string &oper_message)
 287         {
 288                 dccallowlist* udl = ext->get(user);
 289
 290                 // remove their DCCALLOW list if they have one
 291                 if (udl)
 292                 {
 293                         userlist::iterator it = std::find(ul.begin(), ul.end(), user);
 294                         if (it != ul.end())
 295                                 ul.erase(it);
 296                 }
 297
 298                 // remove them from any DCCALLOW lists
 299                 // they are currently on
 300                 RemoveNick(user);
 301         }
 302
 303         virtual void OnUserPostNick(User* user, const std::string &oldnick)
 304         {
 305                 RemoveNick(user);
 306         }
 307
 308         virtual ModResult OnUserPreMessage(User* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 309         {
 310                 return OnUserPreNotice(user, dest, target_type, text, status, exempt_list);
 311         }
 312
 313         virtual ModResult OnUserPreNotice(User* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 314         {
 315                 if (!IS_LOCAL(user))
 316                         return MOD_RES_PASSTHRU;
 317
 318                 if (target_type == TYPE_USER)
 319                 {
 320                         User* u = (User*)dest;
 321
 322                         /* Always allow a user to dcc themselves (although... why?) */
 323                         if (user == u)
 324                                 return MOD_RES_PASSTHRU;
 325
 326                         if ((text.length()) && (text[0] == '\1'))
 327                         {
 328                                 Expire();
 329
 330                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 331                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 332
 333                                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 334                                 {
 335                                         dl = ext->get(u);
 336                                         if (dl && dl->size())
 337                                         {
 338                                                 for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 339                                                         if (InspIRCd::Match(user->GetFullHost(), iter->hostmask))
 340                                                                 return MOD_RES_PASSTHRU;
 341                                         }
 342
 343                                         std::string buf = text.substr(5);
 344                                         size_t s = buf.find(' ');
 345                                         if (s == std::string::npos)
 346                                                 return MOD_RES_PASSTHRU;
 347
 348                                         irc::string type = assign(buf.substr(0, s));
 349
 350                                         ConfigTag* conftag = ServerInstance->Config->ConfValue("dccallow");
 351                                         bool blockchat = conftag->getBool("blockchat");
 352
 353                                         if (type == "SEND")
 354                                         {
 355                                                 size_t first;
 356
 357                                                 buf = buf.substr(s + 1);
 358
 359                                                 if (!buf.empty() && buf[0] == '"')
 360                                                 {
 361                                                         s = buf.find('"', 1);
 362
 363                                                         if (s == std::string::npos || s <= 1)
 364                                                                 return MOD_RES_PASSTHRU;
 365
 366                                                         --s;
 367                                                         first = 1;
 368                                                 }
 369                                                 else
 370                                                 {
 371                                                         s = buf.find(' ');
 372                                                         first = 0;
 373                                                 }
 374
 375                                                 if (s == std::string::npos)
 376                                                         return MOD_RES_PASSTHRU;
 377
 378                                                 std::string defaultaction = conftag->getString("action");
 379                                                 std::string filename = buf.substr(first, s);
 380
 381                                                 bool found = false;
 382                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 383                                                 {
 384                                                         if (InspIRCd::Match(filename, bfl[i].filemask, ascii_case_insensitive_map))
 385                                                         {
 386                                                                 /* We have a matching badfile entry, override whatever the default action is */
 387                                                                 if (bfl[i].action == "allow")
 388                                                                         return MOD_RES_PASSTHRU;
 389                                                                 else
 390                                                                 {
 391                                                                         found = true;
 392                                                                         break;
 393                                                                 }
 394                                                         }
 395                                                 }
 396
 397                                                 /* only follow the default action if no badfile matches were found above */
 398                                                 if ((!found) && (defaultaction == "allow"))
 399                                                         return MOD_RES_PASSTHRU;
 400
 401                                                 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());
 402                                                 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());
 403                                                 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());
 404                                                 return MOD_RES_DENY;
 405                                         }
 406                                         else if ((type == "CHAT") && (blockchat))
 407                                         {
 408                                                 user->WriteServ("NOTICE %s :The user %s is not accepting DCC CHAT requests from you.", user->nick.c_str(), u->nick.c_str());
 409                                                 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());
 410                                                 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());
 411                                                 return MOD_RES_DENY;
 412                                         }
 413                                 }
 414                         }
 415                 }
 416                 return MOD_RES_PASSTHRU;
 417         }
 418
 419         void Expire()
 420         {
 421                 for (userlist::iterator iter = ul.begin(); iter != ul.end();)
 422                 {
 423                         User* u = (User*)(*iter);
 424                         dl = ext->get(u);
 425                         if (dl)
 426                         {
 427                                 if (dl->size())
 428                                 {
 429                                         dccallowlist::iterator iter2 = dl->begin();
 430                                         while (iter2 != dl->end())
 431                                         {
 432                                                 if (iter2->length != 0 && (iter2->set_on + iter2->length) <= ServerInstance->Time())
 433                                                 {
 434                                                         u->WriteNumeric(997, "%s %s :DCCALLOW entry for %s has expired", u->nick.c_str(), u->nick.c_str(), iter2->nickname.c_str());
 435                                                         iter2 = dl->erase(iter2);
 436                                                 }
 437                                                 else
 438                                                 {
 439                                                         ++iter2;
 440                                                 }
 441                                         }
 442                                 }
 443                                 ++iter;
 444                         }
 445                         else
 446                         {
 447                                 iter = ul.erase(iter);
 448                         }
 449                 }
 450         }
 451
 452         void RemoveNick(User* user)
 453         {
 454                 /* Iterate through all DCCALLOW lists and remove user */
 455                 for (userlist::iterator iter = ul.begin(); iter != ul.end();)
 456                 {
 457                         User *u = (User*)(*iter);
 458                         dl = ext->get(u);
 459                         if (dl)
 460                         {
 461                                 if (dl->size())
 462                                 {
 463                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 464                                         {
 465                                                 if (i->nickname == user->nick)
 466                                                 {
 467
 468                                                         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());
 469                                                         u->WriteNumeric(995, "%s %s :Removed %s from your DCCALLOW list", u->nick.c_str(), u->nick.c_str(), i->nickname.c_str());
 470                                                         dl->erase(i);
 471                                                         break;
 472                                                 }
 473                                         }
 474                                 }
 475                                 ++iter;
 476                         }
 477                         else
 478                         {
 479                                 iter = ul.erase(iter);
 480                         }
 481                 }
 482         }
 483
 484         void RemoveFromUserlist(User *user)
 485         {
 486                 // remove user from userlist
 487                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 488                 {
 489                         User* u = (User*)(*j);
 490                         if (u == user)
 491                         {
 492                                 ul.erase(j);
 493                                 break;
 494                         }
 495                 }
 496         }
 497
 498         void ReadFileConf()
 499         {
 500                 bfl.clear();
 501                 ConfigTagList tags = ServerInstance->Config->ConfTags("banfile");
 502                 for (ConfigIter i = tags.first; i != tags.second; ++i)
 503                 {
 504                         BannedFileList bf;
 505                         bf.filemask = i->second->getString("pattern");
 506                         bf.action = i->second->getString("action");
 507                         bfl.push_back(bf);
 508                 }
 509         }
 510
 511         virtual ~ModuleDCCAllow()
 512         {
 513                 delete ext;
 514         }
 515
 516         virtual Version GetVersion()
 517         {
 518                 return Version("Provides support for the /DCCALLOW command", VF_COMMON | VF_VENDOR);
 519         }
 520 };
 521
 522 MODULE_INIT(ModuleDCCAllow)