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