src/usermanager.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2019 iwalkalone <iwalkalone69@gmail.com>
   5  *   Copyright (C) 2019 Matt Schatz <genius3000@g3k.solutions>
   6  *   Copyright (C) 2013-2016, 2018 Attila Molnar <attilamolnar@hush.com>
   7  *   Copyright (C) 2013, 2018-2019 Sadie Powell <sadie@witchery.services>
   8  *   Copyright (C) 2013, 2015 Adam <Adam@anope.org>
   9  *   Copyright (C) 2013 Daniel Vassdal <shutter@canternet.org>
  10  *   Copyright (C) 2012, 2019 Robby <robby@chatbelgie.be>
  11  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
  12  *   Copyright (C) 2009 Uli Schlachter <psychon@inspircd.org>
  13  *   Copyright (C) 2008-2010 Craig Edwards <brain@inspircd.org>
  14  *   Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
  15  *
  16  * This file is part of InspIRCd.  InspIRCd is free software: you can
  17  * redistribute it and/or modify it under the terms of the GNU General Public
  18  * License as published by the Free Software Foundation, version 2.
  19  *
  20  * This program is distributed in the hope that it will be useful, but WITHOUT
  21  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  22  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  23  * details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  27  */
  28
  29
  30 #include "inspircd.h"
  31 #include "xline.h"
  32 #include "iohook.h"
  33
  34 namespace
  35 {
  36         class WriteCommonQuit : public User::ForEachNeighborHandler
  37         {
  38                 ClientProtocol::Messages::Quit quitmsg;
  39                 ClientProtocol::Event quitevent;
  40                 ClientProtocol::Messages::Quit operquitmsg;
  41                 ClientProtocol::Event operquitevent;
  42
  43                 void Execute(LocalUser* user) CXX11_OVERRIDE
  44                 {
  45                         user->Send(user->IsOper() ? operquitevent : quitevent);
  46                 }
  47
  48          public:
  49                 WriteCommonQuit(User* user, const std::string& msg, const std::string& opermsg)
  50                         : quitmsg(user, msg)
  51                         , quitevent(ServerInstance->GetRFCEvents().quit, quitmsg)
  52                         , operquitmsg(user, opermsg)
  53                         , operquitevent(ServerInstance->GetRFCEvents().quit, operquitmsg)
  54                 {
  55                         user->ForEachNeighbor(*this, false);
  56                 }
  57         };
  58
  59         void CheckPingTimeout(LocalUser* user)
  60         {
  61                 // Check if it is time to ping the user yet.
  62                 if (ServerInstance->Time() < user->nextping)
  63                         return;
  64
  65                 // This user didn't answer the last ping, remove them.
  66                 if (!user->lastping)
  67                 {
  68                         ModResult res;
  69                         FIRST_MOD_RESULT(OnConnectionFail, res, (user, I_ERR_TIMEOUT));
  70                         if (res == MOD_RES_ALLOW)
  71                         {
  72                                 // A module is preventing this user from being timed out.
  73                                 user->lastping = 1;
  74                                 user->nextping = ServerInstance->Time() + user->MyClass->GetPingTime();
  75                                 return;
  76                         }
  77
  78                         time_t secs = ServerInstance->Time() - (user->nextping - user->MyClass->GetPingTime());
  79                         const std::string message = "Ping timeout: " + ConvToStr(secs) + (secs != 1 ? " seconds" : " second");
  80                         ServerInstance->Users.QuitUser(user, message);
  81                         return;
  82                 }
  83
  84                 // Send a ping to the client.
  85                 ClientProtocol::Messages::Ping ping;
  86                 user->Send(ServerInstance->GetRFCEvents().ping, ping);
  87                 user->lastping = 0;
  88                 user->nextping = ServerInstance->Time() + user->MyClass->GetPingTime();
  89         }
  90
  91         void CheckRegistrationTimeout(LocalUser* user)
  92         {
  93                 if (user->GetClass() && (ServerInstance->Time() > (user->signon + user->GetClass()->GetRegTimeout())))
  94                 {
  95                         // Either the user did not send NICK/USER or a module blocked registration in
  96                         // OnCheckReady until the client timed out.
  97                         ServerInstance->Users.QuitUser(user, "Registration timeout");
  98                 }
  99         }
 100
 101         void CheckModulesReady(LocalUser* user)
 102         {
 103                 ModResult res;
 104                 FIRST_MOD_RESULT(OnCheckReady, res, (user));
 105                 if (res == MOD_RES_PASSTHRU)
 106                 {
 107                         // User has sent NICK/USER and modules are ready.
 108                         user->FullConnect();
 109                         return;
 110                 }
 111
 112                 // If the user has been quit in OnCheckReady then we shouldn't quit
 113                 // them again for having a registration timeout.
 114                 if (!user->quitting)
 115                         CheckRegistrationTimeout(user);
 116         }
 117 }
 118
 119 UserManager::UserManager()
 120         : already_sent_id(0)
 121         , unregistered_count(0)
 122         , uline_count(0)
 123 {
 124 }
 125
 126 UserManager::~UserManager()
 127 {
 128         for (user_hash::iterator i = clientlist.begin(); i != clientlist.end(); ++i)
 129         {
 130                 delete i->second;
 131         }
 132 }
 133
 134 void UserManager::AddUser(int socket, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
 135 {
 136         // User constructor allocates a new UUID for the user and inserts it into the uuidlist
 137         LocalUser* const New = new LocalUser(socket, client, server);
 138         UserIOHandler* eh = &New->eh;
 139
 140         ServerInstance->Logs->Log("USERS", LOG_DEBUG, "New user fd: %d", socket);
 141
 142         this->unregistered_count++;
 143         this->clientlist[New->nick] = New;
 144         this->AddClone(New);
 145         this->local_users.push_front(New);
 146         FOREACH_MOD(OnUserInit, (New));
 147
 148         if (!SocketEngine::AddFd(eh, FD_WANT_FAST_READ | FD_WANT_EDGE_WRITE))
 149         {
 150                 ServerInstance->Logs->Log("USERS", LOG_DEBUG, "Internal error on new connection");
 151                 this->QuitUser(New, "Internal error handling connection");
 152                 return;
 153         }
 154
 155         // If this listener has an IO hook provider set then tell it about the connection
 156         for (ListenSocket::IOHookProvList::iterator i = via->iohookprovs.begin(); i != via->iohookprovs.end(); ++i)
 157         {
 158                 ListenSocket::IOHookProvRef& iohookprovref = *i;
 159                 if (!iohookprovref)
 160                 {
 161                         if (!iohookprovref.GetProvider().empty())
 162                         {
 163                                 ServerInstance->Logs->Log("USERS", LOG_DEBUG, "Non-existent I/O hook '%s' in <bind:%s> tag at %s",
 164                                         iohookprovref.GetProvider().c_str(),
 165                                         i == via->iohookprovs.begin() ? "hook" : "ssl",
 166                                         via->bind_tag->getTagLocation().c_str());
 167                                 this->QuitUser(New, "Internal error handling connection");
 168                                 return;
 169                         }
 170                         continue;
 171                 }
 172
 173                 iohookprovref->OnAccept(eh, client, server);
 174
 175                 // IOHook could have encountered a fatal error, e.g. if the TLS ClientHello
 176                 // was already in the queue and there was no common TLS version.
 177                 if (!eh->getError().empty())
 178                 {
 179                         QuitUser(New, eh->getError());
 180                         return;
 181                 }
 182         }
 183
 184         if (this->local_users.size() > ServerInstance->Config->SoftLimit)
 185         {
 186                 ServerInstance->SNO->WriteToSnoMask('a', "Warning: softlimit value has been reached: %d clients", ServerInstance->Config->SoftLimit);
 187                 this->QuitUser(New,"No more connections allowed");
 188                 return;
 189         }
 190
 191         // First class check. We do this again in LocalUser::FullConnect() after DNS is done, and NICK/USER is received.
 192         New->SetClass();
 193         // If the user doesn't have an acceptable connect class CheckClass() quits them
 194         New->CheckClass(ServerInstance->Config->CCOnConnect);
 195         if (New->quitting)
 196                 return;
 197
 198         /*
 199          * even with bancache, we still have to keep User::exempt current.
 200          * besides that, if we get a positive bancache hit, we still won't fuck
 201          * them over if they are exempt. -- w00t
 202          */
 203         New->exempt = (ServerInstance->XLines->MatchesLine("E",New) != NULL);
 204
 205         BanCacheHit* const b = ServerInstance->BanCache.GetHit(New->GetIPString());
 206         if (b)
 207         {
 208                 if (!b->Type.empty() && !New->exempt)
 209                 {
 210                         /* user banned */
 211                         ServerInstance->Logs->Log("BANCACHE", LOG_DEBUG, "BanCache: Positive hit for " + New->GetIPString());
 212                         if (!ServerInstance->Config->XLineMessage.empty())
 213                                 New->WriteNumeric(ERR_YOUREBANNEDCREEP, ServerInstance->Config->XLineMessage);
 214
 215                         if (ServerInstance->Config->HideBans)
 216                                 this->QuitUser(New, b->Type + "-lined", &b->Reason);
 217                         else
 218                                 this->QuitUser(New, b->Reason);
 219                         return;
 220                 }
 221                 else
 222                 {
 223                         ServerInstance->Logs->Log("BANCACHE", LOG_DEBUG, "BanCache: Negative hit for " + New->GetIPString());
 224                 }
 225         }
 226         else
 227         {
 228                 if (!New->exempt)
 229                 {
 230                         XLine* r = ServerInstance->XLines->MatchesLine("Z",New);
 231
 232                         if (r)
 233                         {
 234                                 r->Apply(New);
 235                                 return;
 236                         }
 237                 }
 238         }
 239
 240         if (ServerInstance->Config->RawLog)
 241                 New->WriteNotice("*** Raw I/O logging is enabled on this server. All messages, passwords, and commands are being recorded.");
 242
 243         FOREACH_MOD(OnSetUserIP, (New));
 244         if (!New->quitting)
 245                 FOREACH_MOD(OnUserPostInit, (New));
 246 }
 247
 248 void UserManager::QuitUser(User* user, const std::string& quitmessage, const std::string* operquitmessage)
 249 {
 250         if (user->quitting)
 251         {
 252                 ServerInstance->Logs->Log("USERS", LOG_DEFAULT, "ERROR: Tried to quit quitting user: " + user->nick);
 253                 return;
 254         }
 255
 256         if (IS_SERVER(user))
 257         {
 258                 ServerInstance->Logs->Log("USERS", LOG_DEFAULT, "ERROR: Tried to quit server user: " + user->nick);
 259                 return;
 260         }
 261
 262         std::string quitmsg(quitmessage);
 263         std::string operquitmsg;
 264         if (operquitmessage)
 265                 operquitmsg.assign(*operquitmessage);
 266
 267         LocalUser* const localuser = IS_LOCAL(user);
 268         if (localuser)
 269         {
 270                 ModResult MOD_RESULT;
 271                 FIRST_MOD_RESULT(OnUserPreQuit, MOD_RESULT, (localuser, quitmsg, operquitmsg));
 272                 if (MOD_RESULT == MOD_RES_DENY)
 273                         return;
 274         }
 275
 276         if (quitmsg.length() > ServerInstance->Config->Limits.MaxQuit)
 277                 quitmsg.erase(ServerInstance->Config->Limits.MaxQuit + 1);
 278
 279         if (operquitmsg.empty())
 280                 operquitmsg.assign(quitmsg);
 281         else if (operquitmsg.length() > ServerInstance->Config->Limits.MaxQuit)
 282                 operquitmsg.erase(ServerInstance->Config->Limits.MaxQuit + 1);
 283
 284         user->quitting = true;
 285         ServerInstance->Logs->Log("USERS", LOG_DEBUG, "QuitUser: %s=%s '%s'", user->uuid.c_str(), user->nick.c_str(), quitmessage.c_str());
 286         if (localuser)
 287         {
 288                 ClientProtocol::Messages::Error errormsg(InspIRCd::Format("Closing link: (%s@%s) [%s]", user->ident.c_str(), user->GetRealHost().c_str(), operquitmsg.c_str()));
 289                 localuser->Send(ServerInstance->GetRFCEvents().error, errormsg);
 290         }
 291
 292         ServerInstance->GlobalCulls.AddItem(user);
 293
 294         if (user->registered == REG_ALL)
 295         {
 296                 FOREACH_MOD(OnUserQuit, (user, quitmsg, operquitmsg));
 297                 WriteCommonQuit(user, quitmsg, operquitmsg);
 298         }
 299         else
 300                 unregistered_count--;
 301
 302         if (IS_LOCAL(user))
 303         {
 304                 LocalUser* lu = IS_LOCAL(user);
 305                 FOREACH_MOD(OnUserDisconnect, (lu));
 306                 lu->eh.Close();
 307
 308                 if (lu->registered == REG_ALL)
 309                         ServerInstance->SNO->WriteToSnoMask('q',"Client exiting: %s (%s) [%s]", user->GetFullRealHost().c_str(), user->GetIPString().c_str(), operquitmsg.c_str());
 310                 local_users.erase(lu);
 311         }
 312
 313         if (!clientlist.erase(user->nick))
 314                 ServerInstance->Logs->Log("USERS", LOG_DEFAULT, "ERROR: Nick not found in clientlist, cannot remove: " + user->nick);
 315
 316         uuidlist.erase(user->uuid);
 317         user->PurgeEmptyChannels();
 318         user->UnOper();
 319 }
 320
 321 void UserManager::AddClone(User* user)
 322 {
 323         CloneCounts& counts = clonemap[user->GetCIDRMask()];
 324         counts.global++;
 325         if (IS_LOCAL(user))
 326                 counts.local++;
 327 }
 328
 329 void UserManager::RemoveCloneCounts(User *user)
 330 {
 331         CloneMap::iterator it = clonemap.find(user->GetCIDRMask());
 332         if (it != clonemap.end())
 333         {
 334                 CloneCounts& counts = it->second;
 335                 counts.global--;
 336                 if (counts.global == 0)
 337                 {
 338                         // No more users from this IP, remove entry from the map
 339                         clonemap.erase(it);
 340                         return;
 341                 }
 342
 343                 if (IS_LOCAL(user))
 344                         counts.local--;
 345         }
 346 }
 347
 348 void UserManager::RehashCloneCounts()
 349 {
 350         clonemap.clear();
 351
 352         const user_hash& hash = ServerInstance->Users.GetUsers();
 353         for (user_hash::const_iterator i = hash.begin(); i != hash.end(); ++i)
 354         {
 355                 User* u = i->second;
 356                 AddClone(u);
 357         }
 358 }
 359
 360 const UserManager::CloneCounts& UserManager::GetCloneCounts(User* user) const
 361 {
 362         CloneMap::const_iterator it = clonemap.find(user->GetCIDRMask());
 363         if (it != clonemap.end())
 364                 return it->second;
 365         else
 366                 return zeroclonecounts;
 367 }
 368
 369 void UserManager::ServerNoticeAll(const char* text, ...)
 370 {
 371         std::string message;
 372         VAFORMAT(message, text, text);
 373         ClientProtocol::Messages::Privmsg msg(ClientProtocol::Messages::Privmsg::nocopy, ServerInstance->FakeClient, ServerInstance->Config->ServerName, message, MSG_NOTICE);
 374         ClientProtocol::Event msgevent(ServerInstance->GetRFCEvents().privmsg, msg);
 375
 376         for (LocalList::const_iterator i = local_users.begin(); i != local_users.end(); ++i)
 377         {
 378                 LocalUser* user = *i;
 379                 user->Send(msgevent);
 380         }
 381 }
 382
 383 /**
 384  * This function is called once a second from the mainloop.
 385  * It is intended to do background checking on all the users, e.g. do
 386  * ping checks, registration timeouts, etc.
 387  */
 388 void UserManager::DoBackgroundUserStuff()
 389 {
 390         for (LocalList::iterator i = local_users.begin(); i != local_users.end(); )
 391         {
 392                 // It's possible that we quit the user below due to ping timeout etc. and QuitUser() removes it from the list
 393                 LocalUser* curr = *i;
 394                 ++i;
 395
 396                 if (curr->CommandFloodPenalty || curr->eh.getSendQSize())
 397                 {
 398                         unsigned int rate = curr->MyClass->GetCommandRate();
 399                         if (curr->CommandFloodPenalty > rate)
 400                                 curr->CommandFloodPenalty -= rate;
 401                         else
 402                                 curr->CommandFloodPenalty = 0;
 403                         curr->eh.OnDataReady();
 404                 }
 405
 406                 switch (curr->registered)
 407                 {
 408                         case REG_ALL:
 409                                 CheckPingTimeout(curr);
 410                                 break;
 411
 412                         case REG_NICKUSER:
 413                                 CheckModulesReady(curr);
 414                                 break;
 415
 416                         default:
 417                                 CheckRegistrationTimeout(curr);
 418                                 break;
 419                 }
 420         }
 421 }
 422
 423 already_sent_t UserManager::NextAlreadySentId()
 424 {
 425         if (++already_sent_id == 0)
 426         {
 427                 // Wrapped around, reset the already_sent ids of all users
 428                 already_sent_id = 1;
 429                 for (LocalList::iterator i = local_users.begin(); i != local_users.end(); ++i)
 430                 {
 431                         LocalUser* user = *i;
 432                         user->already_sent = 0;
 433                 }
 434         }
 435         return already_sent_id;
 436 }