src/modules/m_cgiirc.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2007-2008 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 Robin Burchell <robin+git@viroteck.net>
   9  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
  10  *   Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
  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 #ifndef WINDOWS
  29 #include <sys/socket.h>
  30 #include <netinet/in.h>
  31 #include <arpa/inet.h>
  32 #endif
  33
  34 /* $ModDesc: Change user's hosts connecting from known CGI:IRC hosts */
  35
  36 enum CGItype { INVALID, PASS, IDENT, PASSFIRST, IDENTFIRST, WEBIRC };
  37
  38
  39 /** Holds a CGI site's details
  40  */
  41 class CGIhost
  42 {
  43 public:
  44         std::string hostmask;
  45         CGItype type;
  46         std::string password;
  47
  48         CGIhost(const std::string &mask = "", CGItype t = IDENTFIRST, const std::string &spassword ="")
  49         : hostmask(mask), type(t), password(spassword)
  50         {
  51         }
  52 };
  53 typedef std::vector<CGIhost> CGIHostlist;
  54
  55 /*
  56  * WEBIRC
  57  *  This is used for the webirc method of CGIIRC auth, and is (really) the best way to do these things.
  58  *  Syntax: WEBIRC password client hostname ip
  59  *  Where password is a shared key, client is the name of the "client" and version (e.g. cgiirc), hostname
  60  *  is the resolved host of the client issuing the command and IP is the real IP of the client.
  61  *
  62  * How it works:
  63  *  To tie in with the rest of cgiirc module, and to avoid race conditions, /webirc is only processed locally
  64  *  and simply sets metadata on the user, which is later decoded on full connect to give something meaningful.
  65  */
  66 class CommandWebirc : public Command
  67 {
  68  public:
  69         bool notify;
  70         StringExtItem realhost;
  71         StringExtItem realip;
  72         LocalStringExt webirc_hostname;
  73         LocalStringExt webirc_ip;
  74
  75         CGIHostlist Hosts;
  76         CommandWebirc(Module* Creator)
  77                 : Command(Creator, "WEBIRC", 4),
  78                   realhost("cgiirc_realhost", Creator), realip("cgiirc_realip", Creator),
  79                   webirc_hostname("cgiirc_webirc_hostname", Creator), webirc_ip("cgiirc_webirc_ip", Creator)
  80                 {
  81                         works_before_reg = true;
  82                         this->syntax = "password client hostname ip";
  83                 }
  84                 CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  85                 {
  86                         if(user->registered == REG_ALL)
  87                                 return CMD_FAILURE;
  88
  89                         for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
  90                         {
  91                                 if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
  92                                 {
  93                                         if(iter->type == WEBIRC && parameters[0] == iter->password)
  94                                         {
  95                                                 realhost.set(user, user->host);
  96                                                 realip.set(user, user->GetIPString());
  97                                                 if (notify)
  98                                                         ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", user->nick.c_str(), user->host.c_str(), parameters[2].c_str(), user->host.c_str());
  99                                                 webirc_hostname.set(user, parameters[2]);
 100                                                 webirc_ip.set(user, parameters[3]);
 101                                                 return CMD_SUCCESS;
 102                                         }
 103                                 }
 104                         }
 105
 106                         ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s tried to use WEBIRC, but didn't match any configured webirc blocks.", user->GetFullRealHost().c_str());
 107                         return CMD_FAILURE;
 108                 }
 109 };
 110
 111
 112 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
 113  */
 114 class CGIResolver : public Resolver
 115 {
 116         std::string typ;
 117         std::string theiruid;
 118         LocalIntExt& waiting;
 119         bool notify;
 120  public:
 121         CGIResolver(Module* me, bool NotifyOpers, const std::string &source, bool forward, LocalUser* u,
 122                         const std::string &type, bool &cached, LocalIntExt& ext)
 123                 : Resolver(source, forward ? DNS_QUERY_A : DNS_QUERY_PTR4, cached, me), typ(type), theiruid(u->uuid),
 124                 waiting(ext), notify(NotifyOpers)
 125         {
 126         }
 127
 128         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
 129         {
 130                 /* Check the user still exists */
 131                 User* them = ServerInstance->FindUUID(theiruid);
 132                 if (them)
 133                 {
 134                         if (notify)
 135                                 ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", them->nick.c_str(), them->host.c_str(), result.c_str(), typ.c_str());
 136
 137                         if (result.length() > 64)
 138                                 return;
 139                         them->host = result;
 140                         them->dhost = result;
 141                         them->InvalidateCache();
 142                         them->CheckLines(true);
 143                 }
 144         }
 145
 146         virtual void OnError(ResolverError e, const std::string &errormessage)
 147         {
 148                 User* them = ServerInstance->FindUUID(theiruid);
 149                 if (them)
 150                 {
 151                         if (notify)
 152                                 ServerInstance->SNO->WriteToSnoMask('a', "Connecting user %s detected as using CGI:IRC (%s), but their host can't be resolved from their %s!", them->nick.c_str(), them->host.c_str(), typ.c_str());
 153                 }
 154         }
 155
 156         virtual ~CGIResolver()
 157         {
 158                 User* them = ServerInstance->FindUUID(theiruid);
 159                 if (!them)
 160                         return;
 161                 int count = waiting.get(them);
 162                 if (count)
 163                         waiting.set(them, count - 1);
 164         }
 165 };
 166
 167 class ModuleCgiIRC : public Module
 168 {
 169         CommandWebirc cmd;
 170         LocalIntExt waiting;
 171 public:
 172         ModuleCgiIRC() : cmd(this), waiting("cgiirc-delay", this)
 173         {
 174         }
 175
 176         void init()
 177         {
 178                 OnRehash(NULL);
 179                 ServerInstance->AddCommand(&cmd);
 180                 ServerInstance->Extensions.Register(&cmd.realhost);
 181                 ServerInstance->Extensions.Register(&cmd.realip);
 182                 ServerInstance->Extensions.Register(&cmd.webirc_hostname);
 183                 ServerInstance->Extensions.Register(&cmd.webirc_ip);
 184
 185                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCheckReady, I_OnUserConnect };
 186                 ServerInstance->Modules->Attach(eventlist, this, 4);
 187         }
 188
 189         void Prioritize()
 190         {
 191                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_FIRST);
 192                 Module* umodes = ServerInstance->Modules->Find("m_conn_umodes.so");
 193                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIORITY_BEFORE, &umodes);
 194         }
 195
 196         void OnRehash(User* user)
 197         {
 198                 cmd.Hosts.clear();
 199
 200                 // Do we send an oper notice when a CGI:IRC has their host changed?
 201                 cmd.notify = ServerInstance->Config->ConfValue("cgiirc")->getBool("opernotice", true);
 202
 203                 ConfigTagList tags = ServerInstance->Config->ConfTags("cgihost");
 204                 for (ConfigIter i = tags.first; i != tags.second; ++i)
 205                 {
 206                         ConfigTag* tag = i->second;
 207                         std::string hostmask = tag->getString("mask"); // An allowed CGI:IRC host
 208                         std::string type = tag->getString("type"); // What type of user-munging we do on this host.
 209                         std::string password = tag->getString("password");
 210
 211                         if(hostmask.length())
 212                         {
 213                                 if (type == "webirc" && !password.length()) {
 214                                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 215                                 }
 216                                 else
 217                                 {
 218                                         CGItype cgitype = INVALID;
 219                                         if (type == "pass")
 220                                                 cgitype = PASS;
 221                                         else if (type == "ident")
 222                                                 cgitype = IDENT;
 223                                         else if (type == "passfirst")
 224                                                 cgitype = PASSFIRST;
 225                                         else if (type == "webirc")
 226                                         {
 227                                                 cgitype = WEBIRC;
 228                                         }
 229
 230                                         if (cgitype == INVALID)
 231                                                 cgitype = PASS;
 232
 233                                         cmd.Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 234                                 }
 235                         }
 236                         else
 237                         {
 238                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 239                                 continue;
 240                         }
 241                 }
 242         }
 243
 244         ModResult OnCheckReady(LocalUser *user)
 245         {
 246                 if (waiting.get(user))
 247                         return MOD_RES_DENY;
 248                 return MOD_RES_PASSTHRU;
 249         }
 250
 251         ModResult OnUserRegister(LocalUser* user)
 252         {
 253                 for(CGIHostlist::iterator iter = cmd.Hosts.begin(); iter != cmd.Hosts.end(); iter++)
 254                 {
 255                         if(InspIRCd::Match(user->host, iter->hostmask, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(user->GetIPString(), iter->hostmask, ascii_case_insensitive_map))
 256                         {
 257                                 // Deal with it...
 258                                 if(iter->type == PASS)
 259                                 {
 260                                         CheckPass(user); // We do nothing if it fails so...
 261                                         user->CheckLines(true);
 262                                 }
 263                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 264                                 {
 265                                         // If the password lookup failed, try the ident
 266                                         CheckIdent(user);       // If this fails too, do nothing
 267                                         user->CheckLines(true);
 268                                 }
 269                                 else if(iter->type == IDENT)
 270                                 {
 271                                         CheckIdent(user); // Nothing on failure.
 272                                         user->CheckLines(true);
 273                                 }
 274                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 275                                 {
 276                                         // If the ident lookup fails, try the password.
 277                                         CheckPass(user);
 278                                         user->CheckLines(true);
 279                                 }
 280                                 else if(iter->type == WEBIRC)
 281                                 {
 282                                         // We don't need to do anything here
 283                                 }
 284                                 return MOD_RES_PASSTHRU;
 285                         }
 286                 }
 287                 return MOD_RES_PASSTHRU;
 288         }
 289
 290         virtual void OnUserConnect(LocalUser* user)
 291         {
 292                 std::string *webirc_hostname = cmd.webirc_hostname.get(user);
 293                 std::string *webirc_ip = cmd.webirc_ip.get(user);
 294                 if (!webirc_ip)
 295                         return;
 296                 ServerInstance->Users->RemoveCloneCounts(user);
 297                 user->SetClientIP(webirc_ip->c_str());
 298                 user->InvalidateCache();
 299                 if (webirc_hostname && webirc_hostname->length() < 64)
 300                         user->host = user->dhost = *webirc_hostname;
 301                 else
 302                         user->host = user->dhost = user->GetIPString();
 303                 user->InvalidateCache();
 304                 ServerInstance->Users->AddLocalClone(user);
 305                 ServerInstance->Users->AddGlobalClone(user);
 306                 user->SetClass();
 307                 user->CheckClass();
 308                 user->CheckLines(true);
 309                 cmd.webirc_ip.unset(user);
 310                 cmd.webirc_hostname.unset(user);
 311         }
 312
 313         bool CheckPass(LocalUser* user)
 314         {
 315                 if(IsValidHost(user->password))
 316                 {
 317                         cmd.realhost.set(user, user->host);
 318                         cmd.realip.set(user, user->GetIPString());
 319                         user->host = user->password;
 320                         user->dhost = user->password;
 321                         user->InvalidateCache();
 322
 323                         ServerInstance->Users->RemoveCloneCounts(user);
 324                         user->SetClientIP(user->password.c_str());
 325                         ServerInstance->Users->AddLocalClone(user);
 326                         ServerInstance->Users->AddGlobalClone(user);
 327                         user->SetClass();
 328                         user->CheckClass();
 329
 330                         try
 331                         {
 332                                 bool cached;
 333                                 CGIResolver* r = new CGIResolver(this, cmd.notify, user->password, false, user, "PASS", cached, waiting);
 334                                 ServerInstance->AddResolver(r, cached);
 335                                 waiting.set(user, waiting.get(user) + 1);
 336                         }
 337                         catch (...)
 338                         {
 339                                 if (cmd.notify)
 340                                         ServerInstance->SNO->WriteToSnoMask('a', "Connecting user %s detected as using CGI:IRC (%s), but I could not resolve their hostname!", user->nick.c_str(), user->host.c_str());
 341                         }
 342
 343                         user->password.clear();
 344                         return true;
 345                 }
 346
 347                 return false;
 348         }
 349
 350         bool CheckIdent(LocalUser* user)
 351         {
 352                 const char* ident;
 353                 int len = user->ident.length();
 354                 in_addr newip;
 355
 356                 if(len == 8)
 357                         ident = user->ident.c_str();
 358                 else if(len == 9 && user->ident[0] == '~')
 359                         ident = user->ident.c_str() + 1;
 360                 else
 361                         return false;
 362
 363                 errno = 0;
 364                 unsigned long ipaddr = strtoul(ident, NULL, 16);
 365                 if (errno)
 366                         return false;
 367                 newip.s_addr = htonl(ipaddr);
 368                 char* newipstr = inet_ntoa(newip);
 369
 370                 cmd.realhost.set(user, user->host);
 371                 cmd.realip.set(user, user->GetIPString());
 372                 ServerInstance->Users->RemoveCloneCounts(user);
 373                 user->SetClientIP(newipstr);
 374                 ServerInstance->Users->AddLocalClone(user);
 375                 ServerInstance->Users->AddGlobalClone(user);
 376                 user->SetClass();
 377                 user->CheckClass();
 378                 user->host = newipstr;
 379                 user->dhost = newipstr;
 380                 user->ident.assign("~cgiirc", 0, 8);
 381                 try
 382                 {
 383
 384                         bool cached;
 385                         CGIResolver* r = new CGIResolver(this, cmd.notify, newipstr, false, user, "IDENT", cached, waiting);
 386                         ServerInstance->AddResolver(r, cached);
 387                         waiting.set(user, waiting.get(user) + 1);
 388                 }
 389                 catch (...)
 390                 {
 391                         user->InvalidateCache();
 392
 393                         if(cmd.notify)
 394                                  ServerInstance->SNO->WriteToSnoMask('a', "Connecting user %s detected as using CGI:IRC (%s), but I could not resolve their hostname!", user->nick.c_str(), user->host.c_str());
 395                 }
 396
 397                 return true;
 398         }
 399
 400         bool IsValidHost(const std::string &host)
 401         {
 402                 if(!host.size() || host.size() > 64)
 403                         return false;
 404
 405                 for(unsigned int i = 0; i < host.size(); i++)
 406                 {
 407                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 408                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 409                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 410                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 411                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 412
 413                                 continue;
 414                         else
 415                                 return false;
 416                 }
 417
 418                 return true;
 419         }
 420
 421         bool IsValidIP(const std::string &ip)
 422         {
 423                 if(ip.size() < 7 || ip.size() > 15)
 424                         return false;
 425
 426                 short sincedot = 0;
 427                 short dots = 0;
 428
 429                 for(unsigned int i = 0; i < ip.size(); i++)
 430                 {
 431                         if((dots <= 3) && (sincedot <= 3))
 432                         {
 433                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 434                                 {
 435                                         sincedot++;
 436                                 }
 437                                 else if(ip[i] == '.')
 438                                 {
 439                                         sincedot = 0;
 440                                         dots++;
 441                                 }
 442                         }
 443                         else
 444                         {
 445                                 return false;
 446
 447                         }
 448                 }
 449
 450                 if(dots != 3)
 451                         return false;
 452
 453                 return true;
 454         }
 455
 456         virtual ~ModuleCgiIRC()
 457         {
 458         }
 459
 460         virtual Version GetVersion()
 461         {
 462                 return Version("Change user's hosts connecting from known CGI:IRC hosts",VF_VENDOR);
 463         }
 464
 465 };
 466
 467 MODULE_INIT(ModuleCgiIRC)