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 enum
  29 {
  30         // InspIRCd-specific?
  31         RPL_DCCALLOWSTART = 990,
  32         RPL_DCCALLOWLIST = 991,
  33         RPL_DCCALLOWEND = 992,
  34         RPL_DCCALLOWTIMED = 993,
  35         RPL_DCCALLOWPERMANENT = 994,
  36         RPL_DCCALLOWREMOVED = 995,
  37         ERR_DCCALLOWINVALID = 996,
  38         RPL_DCCALLOWEXPIRED = 997,
  39         ERR_UNKNOWNDCCALLOWCMD = 998,
  40         // TODO: These numerics are conflicting and should be removed
  41         // and be replaced with helpop.
  42         RPL_DCCALLOWHELP = 998,
  43         RPL_ENDOFDCCALLOWHELP = 999
  44 };
  45
  46 static const char* const helptext[] =
  47 {
  48         "DCCALLOW [(+|-)<nick> [<time>]]|[LIST|HELP]",
  49         "You may allow DCCs from specific users by specifying a",
  50         "DCC allow for the user you want to receive DCCs from.",
  51         "For example, to allow the user Brain to send you inspircd.exe",
  52         "you would type:",
  53         "/DCCALLOW +Brain",
  54         "Brain would then be able to send you files. They would have to",
  55         "resend the file again if the server gave them an error message",
  56         "before you added them to your DCCALLOW list.",
  57         "DCCALLOW entries will be temporary by default, if you want to add",
  58         "them to your DCCALLOW list until you leave IRC, type:",
  59         "/DCCALLOW +Brain 0",
  60         "To remove the user from your DCCALLOW list, type:",
  61         "/DCCALLOW -Brain",
  62         "To see the users in your DCCALLOW list, type:",
  63         "/DCCALLOW LIST",
  64         "NOTE: If the user leaves IRC or changes their nickname",
  65         "  they will be removed from your DCCALLOW list.",
  66         "  your DCCALLOW list will be deleted when you leave IRC."
  67 };
  68
  69 class BannedFileList
  70 {
  71  public:
  72         std::string filemask;
  73         std::string action;
  74 };
  75
  76 class DCCAllow
  77 {
  78  public:
  79         std::string nickname;
  80         std::string hostmask;
  81         time_t set_on;
  82         unsigned long length;
  83
  84         DCCAllow() { }
  85
  86         DCCAllow(const std::string& nick, const std::string& hm, time_t so, unsigned long ln)
  87                 : nickname(nick)
  88                 , hostmask(hm)
  89                 , set_on(so)
  90                 , length(ln)
  91         {
  92         }
  93 };
  94
  95 typedef std::vector<User *> userlist;
  96 userlist ul;
  97 typedef std::vector<DCCAllow> dccallowlist;
  98 dccallowlist* dl;
  99 typedef std::vector<BannedFileList> bannedfilelist;
 100 bannedfilelist bfl;
 101 typedef SimpleExtItem<dccallowlist> DCCAllowExt;
 102
 103 class CommandDccallow : public Command
 104 {
 105         DCCAllowExt& ext;
 106
 107  public:
 108         unsigned int maxentries;
 109         CommandDccallow(Module* parent, DCCAllowExt& Ext)
 110                 : Command(parent, "DCCALLOW", 0)
 111                 , ext(Ext)
 112         {
 113                 syntax = "[(+|-)<nick> [<time>]]|[LIST|HELP]";
 114                 /* XXX we need to fix this so it can work with translation stuff (i.e. move +- into a seperate param */
 115         }
 116
 117         CmdResult Handle(User* user, const Params& parameters) CXX11_OVERRIDE
 118         {
 119                 /* syntax: DCCALLOW [+|-]<nick> (<time>) */
 120                 if (!parameters.size())
 121                 {
 122                         // display current DCCALLOW list
 123                         DisplayDCCAllowList(user);
 124                         return CMD_FAILURE;
 125                 }
 126                 else if (parameters.size() > 0)
 127                 {
 128                         char action = *parameters[0].c_str();
 129
 130                         // if they didn't specify an action, this is probably a command
 131                         if (action != '+' && action != '-')
 132                         {
 133                                 if (!strcasecmp(parameters[0].c_str(), "LIST"))
 134                                 {
 135                                         // list current DCCALLOW list
 136                                         DisplayDCCAllowList(user);
 137                                         return CMD_FAILURE;
 138                                 }
 139                                 else if (!strcasecmp(parameters[0].c_str(), "HELP"))
 140                                 {
 141                                         // display help
 142                                         DisplayHelp(user);
 143                                         return CMD_FAILURE;
 144                                 }
 145                                 else
 146                                 {
 147                                         user->WriteNumeric(ERR_UNKNOWNDCCALLOWCMD, "DCCALLOW command not understood. For help on DCCALLOW, type /DCCALLOW HELP");
 148                                         return CMD_FAILURE;
 149                                 }
 150                         }
 151
 152                         std::string nick(parameters[0], 1);
 153                         User *target = ServerInstance->FindNickOnly(nick);
 154
 155                         if ((target) && (!target->quitting) && (target->registered == REG_ALL))
 156                         {
 157
 158                                 if (action == '-')
 159                                 {
 160                                         // check if it contains any entries
 161                                         dl = ext.get(user);
 162                                         if (dl)
 163                                         {
 164                                                 for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 165                                                 {
 166                                                         // search through list
 167                                                         if (i->nickname == target->nick)
 168                                                         {
 169                                                                 dl->erase(i);
 170                                                                 user->WriteNumeric(RPL_DCCALLOWREMOVED, user->nick, InspIRCd::Format("Removed %s from your DCCALLOW list", target->nick.c_str()));
 171                                                                 break;
 172                                                         }
 173                                                 }
 174                                         }
 175                                 }
 176                                 else if (action == '+')
 177                                 {
 178                                         if (target == user)
 179                                         {
 180                                                 user->WriteNumeric(ERR_DCCALLOWINVALID, user->nick, "You cannot add yourself to your own DCCALLOW list!");
 181                                                 return CMD_FAILURE;
 182                                         }
 183
 184                                         dl = ext.get(user);
 185                                         if (!dl)
 186                                         {
 187                                                 dl = new dccallowlist;
 188                                                 ext.set(user, dl);
 189                                                 // add this user to the userlist
 190                                                 ul.push_back(user);
 191                                         }
 192
 193                                         if (dl->size() >= maxentries)
 194                                         {
 195                                                 user->WriteNumeric(ERR_DCCALLOWINVALID, user->nick, "Too many nicks on DCCALLOW list");
 196                                                 return CMD_FAILURE;
 197                                         }
 198
 199                                         for (dccallowlist::const_iterator k = dl->begin(); k != dl->end(); ++k)
 200                                         {
 201                                                 if (k->nickname == target->nick)
 202                                                 {
 203                                                         user->WriteNumeric(ERR_DCCALLOWINVALID, user->nick, InspIRCd::Format("%s is already on your DCCALLOW list", target->nick.c_str()));
 204                                                         return CMD_FAILURE;
 205                                                 }
 206                                         }
 207
 208                                         std::string mask = target->nick+"!"+target->ident+"@"+target->GetDisplayedHost();
 209                                         std::string default_length = ServerInstance->Config->ConfValue("dccallow")->getString("length");
 210
 211                                         unsigned long length;
 212                                         if (parameters.size() < 2)
 213                                         {
 214                                                 length = InspIRCd::Duration(default_length);
 215                                         }
 216                                         else if (!atoi(parameters[1].c_str()))
 217                                         {
 218                                                 length = 0;
 219                                         }
 220                                         else
 221                                         {
 222                                                 length = InspIRCd::Duration(parameters[1]);
 223                                         }
 224
 225                                         if (!InspIRCd::IsValidMask(mask))
 226                                         {
 227                                                 return CMD_FAILURE;
 228                                         }
 229
 230                                         dl->push_back(DCCAllow(target->nick, mask, ServerInstance->Time(), length));
 231
 232                                         if (length > 0)
 233                                         {
 234                                                 user->WriteNumeric(RPL_DCCALLOWTIMED, user->nick, InspIRCd::Format("Added %s to DCCALLOW list for %ld seconds", target->nick.c_str(), length));
 235                                         }
 236                                         else
 237                                         {
 238                                                 user->WriteNumeric(RPL_DCCALLOWPERMANENT, user->nick, InspIRCd::Format("Added %s to DCCALLOW list for this session", target->nick.c_str()));
 239                                         }
 240
 241                                         /* route it. */
 242                                         return CMD_SUCCESS;
 243                                 }
 244                         }
 245                         else
 246                         {
 247                                 // nick doesn't exist
 248                                 user->WriteNumeric(Numerics::NoSuchNick(nick));
 249                                 return CMD_FAILURE;
 250                         }
 251                 }
 252                 return CMD_FAILURE;
 253         }
 254
 255         RouteDescriptor GetRouting(User* user, const Params& parameters) CXX11_OVERRIDE
 256         {
 257                 return ROUTE_BROADCAST;
 258         }
 259
 260         void DisplayHelp(User* user)
 261         {
 262                 for (size_t i = 0; i < sizeof(helptext)/sizeof(helptext[0]); i++)
 263                         user->WriteNumeric(RPL_DCCALLOWHELP, helptext[i]);
 264                 user->WriteNumeric(RPL_ENDOFDCCALLOWHELP, "End of DCCALLOW HELP");
 265
 266                 LocalUser* localuser = IS_LOCAL(user);
 267                 if (localuser)
 268                         localuser->CommandFloodPenalty += 4000;
 269         }
 270
 271         void DisplayDCCAllowList(User* user)
 272         {
 273                  // display current DCCALLOW list
 274                 user->WriteNumeric(RPL_DCCALLOWSTART, "Users on your DCCALLOW list:");
 275
 276                 dl = ext.get(user);
 277                 if (dl)
 278                 {
 279                         for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 280                         {
 281                                 user->WriteNumeric(RPL_DCCALLOWLIST, user->nick, InspIRCd::Format("%s (%s)", c->nickname.c_str(), c->hostmask.c_str()));
 282                         }
 283                 }
 284
 285                 user->WriteNumeric(RPL_DCCALLOWEND, "End of DCCALLOW list");
 286         }
 287
 288 };
 289
 290 class ModuleDCCAllow : public Module
 291 {
 292         DCCAllowExt ext;
 293         CommandDccallow cmd;
 294
 295  public:
 296         ModuleDCCAllow()
 297                 : ext("dccallow", ExtensionItem::EXT_USER, this)
 298                 , cmd(this, ext)
 299         {
 300         }
 301
 302         void OnUserQuit(User* user, const std::string &reason, const std::string &oper_message) CXX11_OVERRIDE
 303         {
 304                 dccallowlist* udl = ext.get(user);
 305
 306                 // remove their DCCALLOW list if they have one
 307                 if (udl)
 308                         stdalgo::erase(ul, user);
 309
 310                 // remove them from any DCCALLOW lists
 311                 // they are currently on
 312                 RemoveNick(user);
 313         }
 314
 315         void OnUserPostNick(User* user, const std::string &oldnick) CXX11_OVERRIDE
 316         {
 317                 RemoveNick(user);
 318         }
 319
 320         ModResult OnUserPreMessage(User* user, const MessageTarget& target, MessageDetails& details) CXX11_OVERRIDE
 321         {
 322                 if (!IS_LOCAL(user))
 323                         return MOD_RES_PASSTHRU;
 324
 325                 if (target.type == MessageTarget::TYPE_USER)
 326                 {
 327                         User* u = target.Get<User>();
 328
 329                         /* Always allow a user to dcc themselves (although... why?) */
 330                         if (user == u)
 331                                 return MOD_RES_PASSTHRU;
 332
 333                         if ((details.text.length()) && (details.text[0] == '\1'))
 334                         {
 335                                 Expire();
 336
 337                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 338                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 339
 340                                 if (strncmp(details.text.c_str(), "\1DCC ", 5) == 0)
 341                                 {
 342                                         dl = ext.get(u);
 343                                         if (dl && dl->size())
 344                                         {
 345                                                 for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 346                                                         if (InspIRCd::Match(user->GetFullHost(), iter->hostmask))
 347                                                                 return MOD_RES_PASSTHRU;
 348                                         }
 349
 350                                         std::string buf = details.text.substr(5);
 351                                         size_t s = buf.find(' ');
 352                                         if (s == std::string::npos)
 353                                                 return MOD_RES_PASSTHRU;
 354
 355                                         const std::string type = buf.substr(0, s);
 356
 357                                         ConfigTag* conftag = ServerInstance->Config->ConfValue("dccallow");
 358                                         bool blockchat = conftag->getBool("blockchat");
 359
 360                                         if (stdalgo::string::equalsci(type, "SEND"))
 361                                         {
 362                                                 size_t first;
 363
 364                                                 buf = buf.substr(s + 1);
 365
 366                                                 if (!buf.empty() && buf[0] == '"')
 367                                                 {
 368                                                         s = buf.find('"', 1);
 369
 370                                                         if (s == std::string::npos || s <= 1)
 371                                                                 return MOD_RES_PASSTHRU;
 372
 373                                                         --s;
 374                                                         first = 1;
 375                                                 }
 376                                                 else
 377                                                 {
 378                                                         s = buf.find(' ');
 379                                                         first = 0;
 380                                                 }
 381
 382                                                 if (s == std::string::npos)
 383                                                         return MOD_RES_PASSTHRU;
 384
 385                                                 std::string defaultaction = conftag->getString("action");
 386                                                 std::string filename = buf.substr(first, s);
 387
 388                                                 bool found = false;
 389                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 390                                                 {
 391                                                         if (InspIRCd::Match(filename, bfl[i].filemask, ascii_case_insensitive_map))
 392                                                         {
 393                                                                 /* We have a matching badfile entry, override whatever the default action is */
 394                                                                 if (stdalgo::string::equalsci(bfl[i].action, "allow"))
 395                                                                         return MOD_RES_PASSTHRU;
 396                                                                 else
 397                                                                 {
 398                                                                         found = true;
 399                                                                         break;
 400                                                                 }
 401                                                         }
 402                                                 }
 403
 404                                                 /* only follow the default action if no badfile matches were found above */
 405                                                 if ((!found) && (defaultaction == "allow"))
 406                                                         return MOD_RES_PASSTHRU;
 407
 408                                                 user->WriteNotice("The user " + u->nick + " is not accepting DCC SENDs from you. Your file " + filename + " was not sent.");
 409                                                 u->WriteNotice(user->nick + " (" + user->ident + "@" + user->GetDisplayedHost() + ") attempted to send you a file named " + filename + ", which was blocked.");
 410                                                 u->WriteNotice("If you trust " + user->nick + " and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.");
 411                                                 return MOD_RES_DENY;
 412                                         }
 413                                         else if ((blockchat) && (stdalgo::string::equalsci(type, "CHAT")))
 414                                         {
 415                                                 user->WriteNotice("The user " + u->nick + " is not accepting DCC CHAT requests from you.");
 416                                                 u->WriteNotice(user->nick + " (" + user->ident + "@" + user->GetDisplayedHost() + ") attempted to initiate a DCC CHAT session, which was blocked.");
 417                                                 u->WriteNotice("If you trust " + user->nick + " and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.");
 418                                                 return MOD_RES_DENY;
 419                                         }
 420                                 }
 421                         }
 422                 }
 423                 return MOD_RES_PASSTHRU;
 424         }
 425
 426         void Expire()
 427         {
 428                 for (userlist::iterator iter = ul.begin(); iter != ul.end();)
 429                 {
 430                         User* u = (User*)(*iter);
 431                         dl = ext.get(u);
 432                         if (dl)
 433                         {
 434                                 if (dl->size())
 435                                 {
 436                                         dccallowlist::iterator iter2 = dl->begin();
 437                                         while (iter2 != dl->end())
 438                                         {
 439                                                 time_t expires = iter2->set_on + iter2->length;
 440                                                 if (iter2->length != 0 && expires <= ServerInstance->Time())
 441                                                 {
 442                                                         u->WriteNumeric(RPL_DCCALLOWEXPIRED, u->nick, InspIRCd::Format("DCCALLOW entry for %s has expired", iter2->nickname.c_str()));
 443                                                         iter2 = dl->erase(iter2);
 444                                                 }
 445                                                 else
 446                                                 {
 447                                                         ++iter2;
 448                                                 }
 449                                         }
 450                                 }
 451                                 ++iter;
 452                         }
 453                         else
 454                         {
 455                                 iter = ul.erase(iter);
 456                         }
 457                 }
 458         }
 459
 460         void RemoveNick(User* user)
 461         {
 462                 /* Iterate through all DCCALLOW lists and remove user */
 463                 for (userlist::iterator iter = ul.begin(); iter != ul.end();)
 464                 {
 465                         User *u = (User*)(*iter);
 466                         dl = ext.get(u);
 467                         if (dl)
 468                         {
 469                                 if (dl->size())
 470                                 {
 471                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 472                                         {
 473                                                 if (i->nickname == user->nick)
 474                                                 {
 475
 476                                                         u->WriteNotice(i->nickname + " left the network or changed their nickname and has been removed from your DCCALLOW list");
 477                                                         u->WriteNumeric(RPL_DCCALLOWREMOVED, u->nick, InspIRCd::Format("Removed %s from your DCCALLOW list", i->nickname.c_str()));
 478                                                         dl->erase(i);
 479                                                         break;
 480                                                 }
 481                                         }
 482                                 }
 483                                 ++iter;
 484                         }
 485                         else
 486                         {
 487                                 iter = ul.erase(iter);
 488                         }
 489                 }
 490         }
 491
 492         void RemoveFromUserlist(User *user)
 493         {
 494                 // remove user from userlist
 495                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 496                 {
 497                         User* u = (User*)(*j);
 498                         if (u == user)
 499                         {
 500                                 ul.erase(j);
 501                                 break;
 502                         }
 503                 }
 504         }
 505
 506         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 507         {
 508                 ConfigTag* tag = ServerInstance->Config->ConfValue("dccallow");
 509                 cmd.maxentries = tag->getUInt("maxentries", 20);
 510
 511                 bfl.clear();
 512                 ConfigTagList tags = ServerInstance->Config->ConfTags("banfile");
 513                 for (ConfigIter i = tags.first; i != tags.second; ++i)
 514                 {
 515                         BannedFileList bf;
 516                         bf.filemask = i->second->getString("pattern");
 517                         bf.action = i->second->getString("action");
 518                         bfl.push_back(bf);
 519                 }
 520         }
 521
 522         Version GetVersion() CXX11_OVERRIDE
 523         {
 524                 return Version("Provides support for the /DCCALLOW command", VF_COMMON | VF_VENDOR);
 525         }
 526 };
 527
 528 MODULE_INIT(ModuleDCCAllow)