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 class BannedFileList
  29 {
  30  public:
  31         std::string filemask;
  32         std::string action;
  33 };
  34
  35 class DCCAllow
  36 {
  37  public:
  38         std::string nickname;
  39         std::string hostmask;
  40         time_t set_on;
  41         long length;
  42
  43         DCCAllow() { }
  44
  45         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) { }
  46 };
  47
  48 typedef std::vector<User *> userlist;
  49 userlist ul;
  50 typedef std::vector<DCCAllow> dccallowlist;
  51 dccallowlist* dl;
  52 typedef std::vector<BannedFileList> bannedfilelist;
  53 bannedfilelist bfl;
  54 SimpleExtItem<dccallowlist>* ext;
  55
  56 class CommandDccallow : public Command
  57 {
  58  public:
  59         CommandDccallow(Module* parent) : Command(parent, "DCCALLOW", 0)
  60         {
  61                 syntax = "{[+|-]<nick> <time>|HELP|LIST}";
  62                 /* XXX we need to fix this so it can work with translation stuff (i.e. move +- into a seperate param */
  63         }
  64
  65         CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  66         {
  67                 /* syntax: DCCALLOW [+|-]<nick> (<time>) */
  68                 if (!parameters.size())
  69                 {
  70                         // display current DCCALLOW list
  71                         DisplayDCCAllowList(user);
  72                         return CMD_FAILURE;
  73                 }
  74                 else if (parameters.size() > 0)
  75                 {
  76                         char action = *parameters[0].c_str();
  77
  78                         // if they didn't specify an action, this is probably a command
  79                         if (action != '+' && action != '-')
  80                         {
  81                                 if (!strcasecmp(parameters[0].c_str(), "LIST"))
  82                                 {
  83                                         // list current DCCALLOW list
  84                                         DisplayDCCAllowList(user);
  85                                         return CMD_FAILURE;
  86                                 }
  87                                 else if (!strcasecmp(parameters[0].c_str(), "HELP"))
  88                                 {
  89                                         // display help
  90                                         DisplayHelp(user);
  91                                         return CMD_FAILURE;
  92                                 }
  93                                 else
  94                                 {
  95                                         user->WriteNumeric(998, "%s :DCCALLOW command not understood. For help on DCCALLOW, type /DCCALLOW HELP", user->nick.c_str());
  96                                         return CMD_FAILURE;
  97                                 }
  98                         }
  99
 100                         std::string nick = parameters[0].substr(1);
 101                         User *target = ServerInstance->FindNickOnly(nick);
 102
 103                         if ((target) && (!IS_SERVER(target)) && (!target->quitting) && (target->registered == REG_ALL))
 104                         {
 105
 106                                 if (action == '-')
 107                                 {
 108                                         // check if it contains any entries
 109                                         dl = ext->get(user);
 110                                         if (dl)
 111                                         {
 112                                                 for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 113                                                 {
 114                                                         // search through list
 115                                                         if (i->nickname == target->nick)
 116                                                         {
 117                                                                 dl->erase(i);
 118                                                                 user->WriteNumeric(995, "%s %s :Removed %s from your DCCALLOW list", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 119                                                                 break;
 120                                                         }
 121                                                 }
 122                                         }
 123                                 }
 124                                 else if (action == '+')
 125                                 {
 126                                         if (target == user)
 127                                         {
 128                                                 user->WriteNumeric(996, "%s %s :You cannot add yourself to your own DCCALLOW list!", user->nick.c_str(), user->nick.c_str());
 129                                                 return CMD_FAILURE;
 130                                         }
 131
 132                                         dl = ext->get(user);
 133                                         if (!dl)
 134                                         {
 135                                                 dl = new dccallowlist;
 136                                                 ext->set(user, dl);
 137                                                 // add this user to the userlist
 138                                                 ul.push_back(user);
 139                                         }
 140
 141                                         for (dccallowlist::const_iterator k = dl->begin(); k != dl->end(); ++k)
 142                                         {
 143                                                 if (k->nickname == target->nick)
 144                                                 {
 145                                                         user->WriteNumeric(996, "%s %s :%s is already on your DCCALLOW list", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 146                                                         return CMD_FAILURE;
 147                                                 }
 148                                         }
 149
 150                                         std::string mask = target->nick+"!"+target->ident+"@"+target->dhost;
 151                                         std::string default_length = ServerInstance->Config->ConfValue("dccallow")->getString("length");
 152
 153                                         unsigned long length;
 154                                         if (parameters.size() < 2)
 155                                         {
 156                                                 length = InspIRCd::Duration(default_length);
 157                                         }
 158                                         else if (!atoi(parameters[1].c_str()))
 159                                         {
 160                                                 length = 0;
 161                                         }
 162                                         else
 163                                         {
 164                                                 length = InspIRCd::Duration(parameters[1]);
 165                                         }
 166
 167                                         if (!ServerInstance->IsValidMask(mask))
 168                                         {
 169                                                 return CMD_FAILURE;
 170                                         }
 171
 172                                         dl->push_back(DCCAllow(target->nick, mask, ServerInstance->Time(), length));
 173
 174                                         if (length > 0)
 175                                         {
 176                                                 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);
 177                                         }
 178                                         else
 179                                         {
 180                                                 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());
 181                                         }
 182
 183                                         /* route it. */
 184                                         return CMD_SUCCESS;
 185                                 }
 186                         }
 187                         else
 188                         {
 189                                 // nick doesn't exist
 190                                 user->WriteNumeric(401, "%s %s :No such nick/channel", user->nick.c_str(), nick.c_str());
 191                                 return CMD_FAILURE;
 192                         }
 193                 }
 194                 return CMD_FAILURE;
 195         }
 196
 197         RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
 198         {
 199                 return ROUTE_BROADCAST;
 200         }
 201
 202         void DisplayHelp(User* user)
 203         {
 204                 user->WriteNumeric(998, "%s :DCCALLOW [<+|->nick [time]] [list] [help]", user->nick.c_str());
 205                 user->WriteNumeric(998, "%s :You may allow DCCs from specific users by specifying a", user->nick.c_str());
 206                 user->WriteNumeric(998, "%s :DCC allow for the user you want to receive DCCs from.", user->nick.c_str());
 207                 user->WriteNumeric(998, "%s :For example, to allow the user Brain to send you inspircd.exe", user->nick.c_str());
 208                 user->WriteNumeric(998, "%s :you would type:", user->nick.c_str());
 209                 user->WriteNumeric(998, "%s :/DCCALLOW +Brain", user->nick.c_str());
 210                 user->WriteNumeric(998, "%s :Brain would then be able to send you files. They would have to", user->nick.c_str());
 211                 user->WriteNumeric(998, "%s :resend the file again if the server gave them an error message", user->nick.c_str());
 212                 user->WriteNumeric(998, "%s :before you added them to your DCCALLOW list.", user->nick.c_str());
 213                 user->WriteNumeric(998, "%s :DCCALLOW entries will be temporary by default, if you want to add", user->nick.c_str());
 214                 user->WriteNumeric(998, "%s :them to your DCCALLOW list until you leave IRC, type:", user->nick.c_str());
 215                 user->WriteNumeric(998, "%s :/DCCALLOW +Brain 0", user->nick.c_str());
 216                 user->WriteNumeric(998, "%s :To remove the user from your DCCALLOW list, type:", user->nick.c_str());
 217                 user->WriteNumeric(998, "%s :/DCCALLOW -Brain", user->nick.c_str());
 218                 user->WriteNumeric(998, "%s :To see the users in your DCCALLOW list, type:", user->nick.c_str());
 219                 user->WriteNumeric(998, "%s :/DCCALLOW LIST", user->nick.c_str());
 220                 user->WriteNumeric(998, "%s :NOTE: If the user leaves IRC or changes their nickname", user->nick.c_str());
 221                 user->WriteNumeric(998, "%s :  they will be removed from your DCCALLOW list.", user->nick.c_str());
 222                 user->WriteNumeric(998, "%s :  your DCCALLOW list will be deleted when you leave IRC.", user->nick.c_str());
 223                 user->WriteNumeric(999, "%s :End of DCCALLOW HELP", user->nick.c_str());
 224         }
 225
 226         void DisplayDCCAllowList(User* user)
 227         {
 228                  // display current DCCALLOW list
 229                 user->WriteNumeric(990, "%s :Users on your DCCALLOW list:", user->nick.c_str());
 230
 231                 dl = ext->get(user);
 232                 if (dl)
 233                 {
 234                         for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 235                         {
 236                                 user->WriteNumeric(991, "%s %s :%s (%s)", user->nick.c_str(), user->nick.c_str(), c->nickname.c_str(), c->hostmask.c_str());
 237                         }
 238                 }
 239
 240                 user->WriteNumeric(992, "%s :End of DCCALLOW list", user->nick.c_str());
 241         }
 242
 243 };
 244
 245 class ModuleDCCAllow : public Module
 246 {
 247         CommandDccallow cmd;
 248
 249  public:
 250         ModuleDCCAllow()
 251                 : cmd(this)
 252         {
 253                 ext = NULL;
 254         }
 255
 256         void init() CXX11_OVERRIDE
 257         {
 258                 ext = new SimpleExtItem<dccallowlist>("dccallow", this);
 259                 ServerInstance->Modules->AddService(*ext);
 260                 ServerInstance->Modules->AddService(cmd);
 261                 ReadFileConf();
 262                 Implementation eventlist[] = { I_OnUserPreMessage, I_OnUserQuit, I_OnUserPostNick, I_OnRehash };
 263                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
 264         }
 265
 266         void OnRehash(User* user) CXX11_OVERRIDE
 267         {
 268                 ReadFileConf();
 269         }
 270
 271         void OnUserQuit(User* user, const std::string &reason, const std::string &oper_message) CXX11_OVERRIDE
 272         {
 273                 dccallowlist* udl = ext->get(user);
 274
 275                 // remove their DCCALLOW list if they have one
 276                 if (udl)
 277                 {
 278                         userlist::iterator it = std::find(ul.begin(), ul.end(), user);
 279                         if (it != ul.end())
 280                                 ul.erase(it);
 281                 }
 282
 283                 // remove them from any DCCALLOW lists
 284                 // they are currently on
 285                 RemoveNick(user);
 286         }
 287
 288         void OnUserPostNick(User* user, const std::string &oldnick) CXX11_OVERRIDE
 289         {
 290                 RemoveNick(user);
 291         }
 292
 293         ModResult OnUserPreMessage(User* user, void* dest, int target_type, std::string& text, char status, CUList& exempt_list, MessageType msgtype) CXX11_OVERRIDE
 294         {
 295                 if (!IS_LOCAL(user))
 296                         return MOD_RES_PASSTHRU;
 297
 298                 if (target_type == TYPE_USER)
 299                 {
 300                         User* u = (User*)dest;
 301
 302                         /* Always allow a user to dcc themselves (although... why?) */
 303                         if (user == u)
 304                                 return MOD_RES_PASSTHRU;
 305
 306                         if ((text.length()) && (text[0] == '\1'))
 307                         {
 308                                 Expire();
 309
 310                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 311                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 312
 313                                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 314                                 {
 315                                         dl = ext->get(u);
 316                                         if (dl && dl->size())
 317                                         {
 318                                                 for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 319                                                         if (InspIRCd::Match(user->GetFullHost(), iter->hostmask))
 320                                                                 return MOD_RES_PASSTHRU;
 321                                         }
 322
 323                                         // tokenize
 324                                         std::stringstream ss(text);
 325                                         std::string buf;
 326                                         std::vector<std::string> tokens;
 327
 328                                         while (ss >> buf)
 329                                                 tokens.push_back(buf);
 330
 331                                         irc::string type = tokens[1].c_str();
 332
 333                                         ConfigTag* conftag = ServerInstance->Config->ConfValue("dccallow");
 334                                         bool blockchat = conftag->getBool("blockchat");
 335
 336                                         if (type == "SEND")
 337                                         {
 338                                                 std::string defaultaction = conftag->getString("action");
 339                                                 std::string filename = tokens[2];
 340
 341                                                 bool found = false;
 342                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 343                                                 {
 344                                                         if (InspIRCd::Match(filename, bfl[i].filemask, ascii_case_insensitive_map))
 345                                                         {
 346                                                                 /* We have a matching badfile entry, override whatever the default action is */
 347                                                                 if (bfl[i].action == "allow")
 348                                                                         return MOD_RES_PASSTHRU;
 349                                                                 else
 350                                                                 {
 351                                                                         found = true;
 352                                                                         break;
 353                                                                 }
 354                                                         }
 355                                                 }
 356
 357                                                 /* only follow the default action if no badfile matches were found above */
 358                                                 if ((!found) && (defaultaction == "allow"))
 359                                                         return MOD_RES_PASSTHRU;
 360
 361                                                 user->WriteNotice("The user " + u->nick + " is not accepting DCC SENDs from you. Your file " + filename + " was not sent.");
 362                                                 u->WriteNotice(user->nick + " (" + user->ident + "@" + user->dhost + ") attempted to send you a file named " + filename + ", which was blocked.");
 363                                                 u->WriteNotice("If you trust " + user->nick + " and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.");
 364                                                 return MOD_RES_DENY;
 365                                         }
 366                                         else if ((type == "CHAT") && (blockchat))
 367                                         {
 368                                                 user->WriteNotice("The user " + u->nick + " is not accepting DCC CHAT requests from you.");
 369                                                 u->WriteNotice(user->nick + " (" + user->ident + "@" + user->dhost + ") attempted to initiate a DCC CHAT session, which was blocked.");
 370                                                 u->WriteNotice("If you trust " + user->nick + " and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.");
 371                                                 return MOD_RES_DENY;
 372                                         }
 373                                 }
 374                         }
 375                 }
 376                 return MOD_RES_PASSTHRU;
 377         }
 378
 379         void Expire()
 380         {
 381                 for (userlist::iterator iter = ul.begin(); iter != ul.end();)
 382                 {
 383                         User* u = (User*)(*iter);
 384                         dl = ext->get(u);
 385                         if (dl)
 386                         {
 387                                 if (dl->size())
 388                                 {
 389                                         dccallowlist::iterator iter2 = dl->begin();
 390                                         while (iter2 != dl->end())
 391                                         {
 392                                                 if (iter2->length != 0 && (iter2->set_on + iter2->length) <= ServerInstance->Time())
 393                                                 {
 394                                                         u->WriteNumeric(997, "%s %s :DCCALLOW entry for %s has expired", u->nick.c_str(), u->nick.c_str(), iter2->nickname.c_str());
 395                                                         iter2 = dl->erase(iter2);
 396                                                 }
 397                                                 else
 398                                                 {
 399                                                         ++iter2;
 400                                                 }
 401                                         }
 402                                 }
 403                                 ++iter;
 404                         }
 405                         else
 406                         {
 407                                 iter = ul.erase(iter);
 408                         }
 409                 }
 410         }
 411
 412         void RemoveNick(User* user)
 413         {
 414                 /* Iterate through all DCCALLOW lists and remove user */
 415                 for (userlist::iterator iter = ul.begin(); iter != ul.end();)
 416                 {
 417                         User *u = (User*)(*iter);
 418                         dl = ext->get(u);
 419                         if (dl)
 420                         {
 421                                 if (dl->size())
 422                                 {
 423                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 424                                         {
 425                                                 if (i->nickname == user->nick)
 426                                                 {
 427
 428                                                         u->WriteNotice(i->nickname + " left the network or changed their nickname and has been removed from your DCCALLOW list");
 429                                                         u->WriteNumeric(995, "%s %s :Removed %s from your DCCALLOW list", u->nick.c_str(), u->nick.c_str(), i->nickname.c_str());
 430                                                         dl->erase(i);
 431                                                         break;
 432                                                 }
 433                                         }
 434                                 }
 435                                 ++iter;
 436                         }
 437                         else
 438                         {
 439                                 iter = ul.erase(iter);
 440                         }
 441                 }
 442         }
 443
 444         void RemoveFromUserlist(User *user)
 445         {
 446                 // remove user from userlist
 447                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 448                 {
 449                         User* u = (User*)(*j);
 450                         if (u == user)
 451                         {
 452                                 ul.erase(j);
 453                                 break;
 454                         }
 455                 }
 456         }
 457
 458         void ReadFileConf()
 459         {
 460                 bfl.clear();
 461                 ConfigTagList tags = ServerInstance->Config->ConfTags("banfile");
 462                 for (ConfigIter i = tags.first; i != tags.second; ++i)
 463                 {
 464                         BannedFileList bf;
 465                         bf.filemask = i->second->getString("pattern");
 466                         bf.action = i->second->getString("action");
 467                         bfl.push_back(bf);
 468                 }
 469         }
 470
 471         ~ModuleDCCAllow()
 472         {
 473                 delete ext;
 474         }
 475
 476         Version GetVersion() CXX11_OVERRIDE
 477         {
 478                 return Version("Provides support for the /DCCALLOW command", VF_COMMON | VF_VENDOR);
 479         }
 480 };
 481
 482 MODULE_INIT(ModuleDCCAllow)