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>|HELP|LIST}";
  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                                         unsigned long length;
 156                                         if (parameters.size() < 2)
 157                                         {
 158                                                 length = InspIRCd::Duration(default_length);
 159                                         }
 160                                         else if (!atoi(parameters[1].c_str()))
 161                                         {
 162                                                 length = 0;
 163                                         }
 164                                         else
 165                                         {
 166                                                 length = InspIRCd::Duration(parameters[1]);
 167                                         }
 168
 169                                         if (!ServerInstance->IsValidMask(mask.c_str()))
 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
 228         void DisplayDCCAllowList(User* user)
 229         {
 230                  // display current DCCALLOW list
 231                 user->WriteNumeric(990, "%s :Users on your DCCALLOW list:", user->nick.c_str());
 232
 233                 dl = ext->get(user);
 234                 if (dl)
 235                 {
 236                         for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 237                         {
 238                                 user->WriteNumeric(991, "%s %s :%s (%s)", user->nick.c_str(), user->nick.c_str(), c->nickname.c_str(), c->hostmask.c_str());
 239                         }
 240                 }
 241
 242                 user->WriteNumeric(992, "%s :End of DCCALLOW list", user->nick.c_str());
 243         }
 244
 245 };
 246
 247 class ModuleDCCAllow : public Module
 248 {
 249         CommandDccallow cmd;
 250
 251  public:
 252         ModuleDCCAllow()
 253                 : cmd(this)
 254         {
 255                 ext = NULL;
 256         }
 257
 258         void init() CXX11_OVERRIDE
 259         {
 260                 ext = new SimpleExtItem<dccallowlist>("dccallow", this);
 261                 ServerInstance->Modules->AddService(*ext);
 262                 ServerInstance->Modules->AddService(cmd);
 263                 ReadFileConf();
 264                 Implementation eventlist[] = { I_OnUserPreMessage, I_OnUserQuit, I_OnUserPostNick, I_OnRehash };
 265                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 266         }
 267
 268         void OnRehash(User* user) CXX11_OVERRIDE
 269         {
 270                 ReadFileConf();
 271         }
 272
 273         void OnUserQuit(User* user, const std::string &reason, const std::string &oper_message) CXX11_OVERRIDE
 274         {
 275                 dccallowlist* udl = ext->get(user);
 276
 277                 // remove their DCCALLOW list if they have one
 278                 if (udl)
 279                 {
 280                         userlist::iterator it = std::find(ul.begin(), ul.end(), user);
 281                         if (it != ul.end())
 282                                 ul.erase(it);
 283                 }
 284
 285                 // remove them from any DCCALLOW lists
 286                 // they are currently on
 287                 RemoveNick(user);
 288         }
 289
 290         void OnUserPostNick(User* user, const std::string &oldnick) CXX11_OVERRIDE
 291         {
 292                 RemoveNick(user);
 293         }
 294
 295         ModResult OnUserPreMessage(User* user, void* dest, int target_type, std::string& text, char status, CUList& exempt_list, MessageType msgtype) CXX11_OVERRIDE
 296         {
 297                 if (!IS_LOCAL(user))
 298                         return MOD_RES_PASSTHRU;
 299
 300                 if (target_type == TYPE_USER)
 301                 {
 302                         User* u = (User*)dest;
 303
 304                         /* Always allow a user to dcc themselves (although... why?) */
 305                         if (user == u)
 306                                 return MOD_RES_PASSTHRU;
 307
 308                         if ((text.length()) && (text[0] == '\1'))
 309                         {
 310                                 Expire();
 311
 312                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 313                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 314
 315                                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 316                                 {
 317                                         dl = ext->get(u);
 318                                         if (dl && dl->size())
 319                                         {
 320                                                 for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 321                                                         if (InspIRCd::Match(user->GetFullHost(), iter->hostmask))
 322                                                                 return MOD_RES_PASSTHRU;
 323                                         }
 324
 325                                         // tokenize
 326                                         std::stringstream ss(text);
 327                                         std::string buf;
 328                                         std::vector<std::string> tokens;
 329
 330                                         while (ss >> buf)
 331                                                 tokens.push_back(buf);
 332
 333                                         irc::string type = tokens[1].c_str();
 334
 335                                         ConfigTag* conftag = ServerInstance->Config->ConfValue("dccallow");
 336                                         bool blockchat = conftag->getBool("blockchat");
 337
 338                                         if (type == "SEND")
 339                                         {
 340                                                 std::string defaultaction = conftag->getString("action");
 341                                                 std::string filename = tokens[2];
 342
 343                                                 bool found = false;
 344                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 345                                                 {
 346                                                         if (InspIRCd::Match(filename, bfl[i].filemask, ascii_case_insensitive_map))
 347                                                         {
 348                                                                 /* We have a matching badfile entry, override whatever the default action is */
 349                                                                 if (bfl[i].action == "allow")
 350                                                                         return MOD_RES_PASSTHRU;
 351                                                                 else
 352                                                                 {
 353                                                                         found = true;
 354                                                                         break;
 355                                                                 }
 356                                                         }
 357                                                 }
 358
 359                                                 /* only follow the default action if no badfile matches were found above */
 360                                                 if ((!found) && (defaultaction == "allow"))
 361                                                         return MOD_RES_PASSTHRU;
 362
 363                                                 user->WriteNotice("The user " + u->nick + " is not accepting DCC SENDs from you. Your file " + filename + " was not sent.");
 364                                                 u->WriteNotice(user->nick + " (" + user->ident + "@" + user->dhost + ") attempted to send you a file named " + filename + ", which was blocked.");
 365                                                 u->WriteNotice("If you trust " + user->nick + " and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.");
 366                                                 return MOD_RES_DENY;
 367                                         }
 368                                         else if ((type == "CHAT") && (blockchat))
 369                                         {
 370                                                 user->WriteNotice("The user " + u->nick + " is not accepting DCC CHAT requests from you.");
 371                                                 u->WriteNotice(user->nick + " (" + user->ident + "@" + user->dhost + ") attempted to initiate a DCC CHAT session, which was blocked.");
 372                                                 u->WriteNotice("If you trust " + user->nick + " and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.");
 373                                                 return MOD_RES_DENY;
 374                                         }
 375                                 }
 376                         }
 377                 }
 378                 return MOD_RES_PASSTHRU;
 379         }
 380
 381         void Expire()
 382         {
 383                 for (userlist::iterator iter = ul.begin(); iter != ul.end();)
 384                 {
 385                         User* u = (User*)(*iter);
 386                         dl = ext->get(u);
 387                         if (dl)
 388                         {
 389                                 if (dl->size())
 390                                 {
 391                                         dccallowlist::iterator iter2 = dl->begin();
 392                                         while (iter2 != dl->end())
 393                                         {
 394                                                 if (iter2->length != 0 && (iter2->set_on + iter2->length) <= ServerInstance->Time())
 395                                                 {
 396                                                         u->WriteNumeric(997, "%s %s :DCCALLOW entry for %s has expired", u->nick.c_str(), u->nick.c_str(), iter2->nickname.c_str());
 397                                                         iter2 = dl->erase(iter2);
 398                                                 }
 399                                                 else
 400                                                 {
 401                                                         ++iter2;
 402                                                 }
 403                                         }
 404                                 }
 405                                 ++iter;
 406                         }
 407                         else
 408                         {
 409                                 iter = ul.erase(iter);
 410                         }
 411                 }
 412         }
 413
 414         void RemoveNick(User* user)
 415         {
 416                 /* Iterate through all DCCALLOW lists and remove user */
 417                 for (userlist::iterator iter = ul.begin(); iter != ul.end();)
 418                 {
 419                         User *u = (User*)(*iter);
 420                         dl = ext->get(u);
 421                         if (dl)
 422                         {
 423                                 if (dl->size())
 424                                 {
 425                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 426                                         {
 427                                                 if (i->nickname == user->nick)
 428                                                 {
 429
 430                                                         u->WriteNotice(i->nickname + " left the network or changed their nickname and has been removed from your DCCALLOW list");
 431                                                         u->WriteNumeric(995, "%s %s :Removed %s from your DCCALLOW list", u->nick.c_str(), u->nick.c_str(), i->nickname.c_str());
 432                                                         dl->erase(i);
 433                                                         break;
 434                                                 }
 435                                         }
 436                                 }
 437                                 ++iter;
 438                         }
 439                         else
 440                         {
 441                                 iter = ul.erase(iter);
 442                         }
 443                 }
 444         }
 445
 446         void RemoveFromUserlist(User *user)
 447         {
 448                 // remove user from userlist
 449                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 450                 {
 451                         User* u = (User*)(*j);
 452                         if (u == user)
 453                         {
 454                                 ul.erase(j);
 455                                 break;
 456                         }
 457                 }
 458         }
 459
 460         void ReadFileConf()
 461         {
 462                 bfl.clear();
 463                 ConfigTagList tags = ServerInstance->Config->ConfTags("banfile");
 464                 for (ConfigIter i = tags.first; i != tags.second; ++i)
 465                 {
 466                         BannedFileList bf;
 467                         bf.filemask = i->second->getString("pattern");
 468                         bf.action = i->second->getString("action");
 469                         bfl.push_back(bf);
 470                 }
 471         }
 472
 473         ~ModuleDCCAllow()
 474         {
 475                 delete ext;
 476         }
 477
 478         Version GetVersion() CXX11_OVERRIDE
 479         {
 480                 return Version("Provides support for the /DCCALLOW command", VF_COMMON | VF_VENDOR);
 481         }
 482 };
 483
 484 MODULE_INIT(ModuleDCCAllow)