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