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 typedef SimpleExtItem<dccallowlist> DCCAllowExt;
  55
  56 class CommandDccallow : public Command
  57 {
  58         DCCAllowExt& ext;
  59
  60  public:
  61         unsigned int maxentries;
  62         CommandDccallow(Module* parent, DCCAllowExt& Ext)
  63                 : Command(parent, "DCCALLOW", 0)
  64                 , ext(Ext)
  65         {
  66                 syntax = "[(+|-)<nick> [<time>]]|[LIST|HELP]";
  67                 /* XXX we need to fix this so it can work with translation stuff (i.e. move +- into a seperate param */
  68         }
  69
  70         CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  71         {
  72                 /* syntax: DCCALLOW [+|-]<nick> (<time>) */
  73                 if (!parameters.size())
  74                 {
  75                         // display current DCCALLOW list
  76                         DisplayDCCAllowList(user);
  77                         return CMD_FAILURE;
  78                 }
  79                 else if (parameters.size() > 0)
  80                 {
  81                         char action = *parameters[0].c_str();
  82
  83                         // if they didn't specify an action, this is probably a command
  84                         if (action != '+' && action != '-')
  85                         {
  86                                 if (!strcasecmp(parameters[0].c_str(), "LIST"))
  87                                 {
  88                                         // list current DCCALLOW list
  89                                         DisplayDCCAllowList(user);
  90                                         return CMD_FAILURE;
  91                                 }
  92                                 else if (!strcasecmp(parameters[0].c_str(), "HELP"))
  93                                 {
  94                                         // display help
  95                                         DisplayHelp(user);
  96                                         return CMD_FAILURE;
  97                                 }
  98                                 else
  99                                 {
 100                                         user->WriteNumeric(998, ":DCCALLOW command not understood. For help on DCCALLOW, type /DCCALLOW HELP");
 101                                         return CMD_FAILURE;
 102                                 }
 103                         }
 104
 105                         std::string nick(parameters[0], 1);
 106                         User *target = ServerInstance->FindNickOnly(nick);
 107
 108                         if ((target) && (!target->quitting) && (target->registered == REG_ALL))
 109                         {
 110
 111                                 if (action == '-')
 112                                 {
 113                                         // check if it contains any entries
 114                                         dl = ext.get(user);
 115                                         if (dl)
 116                                         {
 117                                                 for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 118                                                 {
 119                                                         // search through list
 120                                                         if (i->nickname == target->nick)
 121                                                         {
 122                                                                 dl->erase(i);
 123                                                                 user->WriteNumeric(995, "%s :Removed %s from your DCCALLOW list", user->nick.c_str(), target->nick.c_str());
 124                                                                 break;
 125                                                         }
 126                                                 }
 127                                         }
 128                                 }
 129                                 else if (action == '+')
 130                                 {
 131                                         if (target == user)
 132                                         {
 133                                                 user->WriteNumeric(996, "%s :You cannot add yourself to your own DCCALLOW list!", user->nick.c_str());
 134                                                 return CMD_FAILURE;
 135                                         }
 136
 137                                         dl = ext.get(user);
 138                                         if (!dl)
 139                                         {
 140                                                 dl = new dccallowlist;
 141                                                 ext.set(user, dl);
 142                                                 // add this user to the userlist
 143                                                 ul.push_back(user);
 144                                         }
 145
 146                                         if (dl->size() >= maxentries)
 147                                         {
 148                                                 user->WriteNumeric(996, "%s :Too many nicks on DCCALLOW list", user->nick.c_str());
 149                                                 return CMD_FAILURE;
 150                                         }
 151
 152                                         for (dccallowlist::const_iterator k = dl->begin(); k != dl->end(); ++k)
 153                                         {
 154                                                 if (k->nickname == target->nick)
 155                                                 {
 156                                                         user->WriteNumeric(996, "%s :%s is already on your DCCALLOW list", user->nick.c_str(), target->nick.c_str());
 157                                                         return CMD_FAILURE;
 158                                                 }
 159                                         }
 160
 161                                         std::string mask = target->nick+"!"+target->ident+"@"+target->dhost;
 162                                         std::string default_length = ServerInstance->Config->ConfValue("dccallow")->getString("length");
 163
 164                                         unsigned long length;
 165                                         if (parameters.size() < 2)
 166                                         {
 167                                                 length = InspIRCd::Duration(default_length);
 168                                         }
 169                                         else if (!atoi(parameters[1].c_str()))
 170                                         {
 171                                                 length = 0;
 172                                         }
 173                                         else
 174                                         {
 175                                                 length = InspIRCd::Duration(parameters[1]);
 176                                         }
 177
 178                                         if (!InspIRCd::IsValidMask(mask))
 179                                         {
 180                                                 return CMD_FAILURE;
 181                                         }
 182
 183                                         dl->push_back(DCCAllow(target->nick, mask, ServerInstance->Time(), length));
 184
 185                                         if (length > 0)
 186                                         {
 187                                                 user->WriteNumeric(993, "%s :Added %s to DCCALLOW list for %ld seconds", user->nick.c_str(), target->nick.c_str(), length);
 188                                         }
 189                                         else
 190                                         {
 191                                                 user->WriteNumeric(994, "%s :Added %s to DCCALLOW list for this session", user->nick.c_str(), target->nick.c_str());
 192                                         }
 193
 194                                         /* route it. */
 195                                         return CMD_SUCCESS;
 196                                 }
 197                         }
 198                         else
 199                         {
 200                                 // nick doesn't exist
 201                                 user->WriteNumeric(401, "%s :No such nick/channel", nick.c_str());
 202                                 return CMD_FAILURE;
 203                         }
 204                 }
 205                 return CMD_FAILURE;
 206         }
 207
 208         RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
 209         {
 210                 return ROUTE_BROADCAST;
 211         }
 212
 213         void DisplayHelp(User* user)
 214         {
 215                 user->WriteNumeric(998, ":DCCALLOW [(+|-)<nick> [<time>]]|[LIST|HELP]");
 216                 user->WriteNumeric(998, ":You may allow DCCs from specific users by specifying a");
 217                 user->WriteNumeric(998, ":DCC allow for the user you want to receive DCCs from.");
 218                 user->WriteNumeric(998, ":For example, to allow the user Brain to send you inspircd.exe");
 219                 user->WriteNumeric(998, ":you would type:");
 220                 user->WriteNumeric(998, ":/DCCALLOW +Brain");
 221                 user->WriteNumeric(998, ":Brain would then be able to send you files. They would have to");
 222                 user->WriteNumeric(998, ":resend the file again if the server gave them an error message");
 223                 user->WriteNumeric(998, ":before you added them to your DCCALLOW list.");
 224                 user->WriteNumeric(998, ":DCCALLOW entries will be temporary by default, if you want to add");
 225                 user->WriteNumeric(998, ":them to your DCCALLOW list until you leave IRC, type:");
 226                 user->WriteNumeric(998, ":/DCCALLOW +Brain 0");
 227                 user->WriteNumeric(998, ":To remove the user from your DCCALLOW list, type:");
 228                 user->WriteNumeric(998, ":/DCCALLOW -Brain");
 229                 user->WriteNumeric(998, ":To see the users in your DCCALLOW list, type:");
 230                 user->WriteNumeric(998, ":/DCCALLOW LIST");
 231                 user->WriteNumeric(998, ":NOTE: If the user leaves IRC or changes their nickname");
 232                 user->WriteNumeric(998, ":  they will be removed from your DCCALLOW list.");
 233                 user->WriteNumeric(998, ":  your DCCALLOW list will be deleted when you leave IRC.");
 234                 user->WriteNumeric(999, ":End of DCCALLOW HELP");
 235
 236                 LocalUser* localuser = IS_LOCAL(user);
 237                 if (localuser)
 238                         localuser->CommandFloodPenalty += 4000;
 239         }
 240
 241         void DisplayDCCAllowList(User* user)
 242         {
 243                  // display current DCCALLOW list
 244                 user->WriteNumeric(990, ":Users on your DCCALLOW list:");
 245
 246                 dl = ext.get(user);
 247                 if (dl)
 248                 {
 249                         for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 250                         {
 251                                 user->WriteNumeric(991, "%s :%s (%s)", user->nick.c_str(), c->nickname.c_str(), c->hostmask.c_str());
 252                         }
 253                 }
 254
 255                 user->WriteNumeric(992, ":End of DCCALLOW list");
 256         }
 257
 258 };
 259
 260 class ModuleDCCAllow : public Module
 261 {
 262         DCCAllowExt ext;
 263         CommandDccallow cmd;
 264
 265  public:
 266         ModuleDCCAllow()
 267                 : ext("dccallow", ExtensionItem::EXT_USER, this)
 268                 , cmd(this, ext)
 269         {
 270         }
 271
 272         void OnUserQuit(User* user, const std::string &reason, const std::string &oper_message) CXX11_OVERRIDE
 273         {
 274                 dccallowlist* udl = ext.get(user);
 275
 276                 // remove their DCCALLOW list if they have one
 277                 if (udl)
 278                         stdalgo::erase(ul, user);
 279
 280                 // remove them from any DCCALLOW lists
 281                 // they are currently on
 282                 RemoveNick(user);
 283         }
 284
 285         void OnUserPostNick(User* user, const std::string &oldnick) CXX11_OVERRIDE
 286         {
 287                 RemoveNick(user);
 288         }
 289
 290         ModResult OnUserPreMessage(User* user, void* dest, int target_type, std::string& text, char status, CUList& exempt_list, MessageType msgtype) CXX11_OVERRIDE
 291         {
 292                 if (!IS_LOCAL(user))
 293                         return MOD_RES_PASSTHRU;
 294
 295                 if (target_type == TYPE_USER)
 296                 {
 297                         User* u = (User*)dest;
 298
 299                         /* Always allow a user to dcc themselves (although... why?) */
 300                         if (user == u)
 301                                 return MOD_RES_PASSTHRU;
 302
 303                         if ((text.length()) && (text[0] == '\1'))
 304                         {
 305                                 Expire();
 306
 307                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 308                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 309
 310                                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 311                                 {
 312                                         dl = ext.get(u);
 313                                         if (dl && dl->size())
 314                                         {
 315                                                 for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 316                                                         if (InspIRCd::Match(user->GetFullHost(), iter->hostmask))
 317                                                                 return MOD_RES_PASSTHRU;
 318                                         }
 319
 320                                         // tokenize
 321                                         std::stringstream ss(text);
 322                                         std::string buf;
 323                                         std::vector<std::string> tokens;
 324
 325                                         while (ss >> buf)
 326                                                 tokens.push_back(buf);
 327
 328                                         if (tokens.size() < 2)
 329                                                 return MOD_RES_PASSTHRU;
 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                                                 if (tokens.size() < 3)
 339                                                         return MOD_RES_PASSTHRU;
 340
 341                                                 std::string defaultaction = conftag->getString("action");
 342                                                 std::string filename = tokens[2];
 343
 344                                                 bool found = false;
 345                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 346                                                 {
 347                                                         if (InspIRCd::Match(filename, bfl[i].filemask, ascii_case_insensitive_map))
 348                                                         {
 349                                                                 /* We have a matching badfile entry, override whatever the default action is */
 350                                                                 if (bfl[i].action == "allow")
 351                                                                         return MOD_RES_PASSTHRU;
 352                                                                 else
 353                                                                 {
 354                                                                         found = true;
 355                                                                         break;
 356                                                                 }
 357                                                         }
 358                                                 }
 359
 360                                                 /* only follow the default action if no badfile matches were found above */
 361                                                 if ((!found) && (defaultaction == "allow"))
 362                                                         return MOD_RES_PASSTHRU;
 363
 364                                                 user->WriteNotice("The user " + u->nick + " is not accepting DCC SENDs from you. Your file " + filename + " was not sent.");
 365                                                 u->WriteNotice(user->nick + " (" + user->ident + "@" + user->dhost + ") attempted to send you a file named " + filename + ", which was blocked.");
 366                                                 u->WriteNotice("If you trust " + user->nick + " and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.");
 367                                                 return MOD_RES_DENY;
 368                                         }
 369                                         else if ((type == "CHAT") && (blockchat))
 370                                         {
 371                                                 user->WriteNotice("The user " + u->nick + " is not accepting DCC CHAT requests from you.");
 372                                                 u->WriteNotice(user->nick + " (" + user->ident + "@" + user->dhost + ") attempted to initiate a DCC CHAT session, which was blocked.");
 373                                                 u->WriteNotice("If you trust " + user->nick + " and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.");
 374                                                 return MOD_RES_DENY;
 375                                         }
 376                                 }
 377                         }
 378                 }
 379                 return MOD_RES_PASSTHRU;
 380         }
 381
 382         void Expire()
 383         {
 384                 for (userlist::iterator iter = ul.begin(); iter != ul.end();)
 385                 {
 386                         User* u = (User*)(*iter);
 387                         dl = ext.get(u);
 388                         if (dl)
 389                         {
 390                                 if (dl->size())
 391                                 {
 392                                         dccallowlist::iterator iter2 = dl->begin();
 393                                         while (iter2 != dl->end())
 394                                         {
 395                                                 if (iter2->length != 0 && (iter2->set_on + iter2->length) <= ServerInstance->Time())
 396                                                 {
 397                                                         u->WriteNumeric(997, "%s :DCCALLOW entry for %s has expired", u->nick.c_str(), iter2->nickname.c_str());
 398                                                         iter2 = dl->erase(iter2);
 399                                                 }
 400                                                 else
 401                                                 {
 402                                                         ++iter2;
 403                                                 }
 404                                         }
 405                                 }
 406                                 ++iter;
 407                         }
 408                         else
 409                         {
 410                                 iter = ul.erase(iter);
 411                         }
 412                 }
 413         }
 414
 415         void RemoveNick(User* user)
 416         {
 417                 /* Iterate through all DCCALLOW lists and remove user */
 418                 for (userlist::iterator iter = ul.begin(); iter != ul.end();)
 419                 {
 420                         User *u = (User*)(*iter);
 421                         dl = ext.get(u);
 422                         if (dl)
 423                         {
 424                                 if (dl->size())
 425                                 {
 426                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 427                                         {
 428                                                 if (i->nickname == user->nick)
 429                                                 {
 430
 431                                                         u->WriteNotice(i->nickname + " left the network or changed their nickname and has been removed from your DCCALLOW list");
 432                                                         u->WriteNumeric(995, "%s :Removed %s from your DCCALLOW list", u->nick.c_str(), i->nickname.c_str());
 433                                                         dl->erase(i);
 434                                                         break;
 435                                                 }
 436                                         }
 437                                 }
 438                                 ++iter;
 439                         }
 440                         else
 441                         {
 442                                 iter = ul.erase(iter);
 443                         }
 444                 }
 445         }
 446
 447         void RemoveFromUserlist(User *user)
 448         {
 449                 // remove user from userlist
 450                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 451                 {
 452                         User* u = (User*)(*j);
 453                         if (u == user)
 454                         {
 455                                 ul.erase(j);
 456                                 break;
 457                         }
 458                 }
 459         }
 460
 461         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 462         {
 463                 ConfigTag* tag = ServerInstance->Config->ConfValue("dccallow");
 464                 cmd.maxentries = tag->getInt("maxentries", 20);
 465
 466                 bfl.clear();
 467                 ConfigTagList tags = ServerInstance->Config->ConfTags("banfile");
 468                 for (ConfigIter i = tags.first; i != tags.second; ++i)
 469                 {
 470                         BannedFileList bf;
 471                         bf.filemask = i->second->getString("pattern");
 472                         bf.action = i->second->getString("action");
 473                         bfl.push_back(bf);
 474                 }
 475         }
 476
 477         Version GetVersion() CXX11_OVERRIDE
 478         {
 479                 return Version("Provides support for the /DCCALLOW command", VF_COMMON | VF_VENDOR);
 480         }
 481 };
 482
 483 MODULE_INIT(ModuleDCCAllow)