src/modules/m_cgiirc.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 #ifndef WINDOWS
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #endif
  21
  22 /* $ModDesc: Change user's hosts connecting from known CGI:IRC hosts */
  23
  24 enum CGItype { INVALID, PASS, IDENT, PASSFIRST, IDENTFIRST, WEBIRC };
  25
  26
  27 /** Holds a CGI site's details
  28  */
  29 class CGIhost : public classbase
  30 {
  31 public:
  32         std::string hostmask;
  33         CGItype type;
  34         std::string password;
  35
  36         CGIhost(const std::string &mask = "", CGItype t = IDENTFIRST, const std::string &spassword ="")
  37         : hostmask(mask), type(t), password(spassword)
  38         {
  39         }
  40 };
  41 typedef std::vector<CGIhost> CGIHostlist;
  42
  43 /*
  44  * WEBIRC
  45  *  This is used for the webirc method of CGIIRC auth, and is (really) the best way to do these things.
  46  *  Syntax: WEBIRC password client hostname ip
  47  *  Where password is a shared key, client is the name of the "client" and version (e.g. cgiirc), hostname
  48  *  is the resolved host of the client issuing the command and IP is the real IP of the client.
  49  *
  50  * How it works:
  51  *  To tie in with the rest of cgiirc module, and to avoid race conditions, /webirc is only processed locally
  52  *  and simply sets metadata on the user, which is later decoded on full connect to give something meaningful.
  53  */
  54 class CommandWebirc : public Command
  55 {
  56         // XXX why is inspircd declared here? does class command not have one?
  57         InspIRCd* Me;
  58         CGIHostlist Hosts;
  59         bool notify;
  60         public:
  61                 CommandWebirc(InspIRCd* iMe, CGIHostlist &cHosts, bool bnotify) : Command(iMe, "WEBIRC", 0, 4, true), Hosts(cHosts), notify(bnotify)
  62                 {
  63                         this->source = "m_cgiirc.so";
  64                         this->syntax = "password client hostname ip";
  65                 }
  66                 CmdResult Handle(const char** parameters, int pcnt, User *user)
  67                 {
  68                         if(user->registered == REG_ALL)
  69                                 return CMD_FAILURE;
  70
  71                         for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
  72                         {
  73                                 if(ServerInstance->MatchText(user->host, iter->hostmask) || ServerInstance->MatchText(user->GetIPString(), iter->hostmask))
  74                                 {
  75                                         if(iter->type == WEBIRC && parameters[0] == iter->password)
  76                                         {
  77                                                 user->Extend("cgiirc_realhost", new std::string(user->host));
  78                                                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
  79                                                 if (notify)
  80                                                         ServerInstance->SNO->WriteToSnoMask('A', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", user->nick, user->host, parameters[2], user->host);
  81                                                 user->Extend("cgiirc_webirc_hostname", new std::string(parameters[2]));
  82                                                 user->Extend("cgiirc_webirc_ip", new std::string(parameters[3]));
  83                                                 return CMD_LOCALONLY;
  84                                         }
  85                                 }
  86                         }
  87                         return CMD_FAILURE;
  88                 }
  89 };
  90
  91
  92 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
  93  */
  94 class CGIResolver : public Resolver
  95 {
  96         std::string typ;
  97         int theirfd;
  98         User* them;
  99         bool notify;
 100  public:
 101         CGIResolver(Module* me, InspIRCd* Instance, bool NotifyOpers, const std::string &source, bool forward, User* u, int userfd, const std::string &type, bool &cached)
 102                 : Resolver(Instance, source, forward ? DNS_QUERY_A : DNS_QUERY_PTR4, cached, me), typ(type), theirfd(userfd), them(u), notify(NotifyOpers) { }
 103
 104         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached, int resultnum = 0)
 105         {
 106                 if (resultnum)
 107                         return;
 108
 109                 /* Check the user still exists */
 110                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
 111                 {
 112                         if (notify)
 113                                 ServerInstance->SNO->WriteToSnoMask('A', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", them->nick, them->host, result.c_str(), typ.c_str());
 114
 115                         strlcpy(them->host, result.c_str(), 63);
 116                         strlcpy(them->dhost, result.c_str(), 63);
 117                         strlcpy(them->ident, "~cgiirc", 8);
 118                         them->InvalidateCache();
 119                 }
 120         }
 121
 122         virtual void OnError(ResolverError e, const std::string &errormessage)
 123         {
 124                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
 125                 {
 126                         if (notify)
 127                                 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, them->host,typ.c_str());
 128                 }
 129         }
 130
 131         virtual ~CGIResolver()
 132         {
 133         }
 134 };
 135
 136 class ModuleCgiIRC : public Module
 137 {
 138         CommandWebirc* mycommand;
 139         bool NotifyOpers;
 140         CGIHostlist Hosts;
 141 public:
 142         ModuleCgiIRC(InspIRCd* Me) : Module(Me)
 143         {
 144
 145                 OnRehash(NULL,"");
 146                 mycommand = new CommandWebirc(Me, Hosts, NotifyOpers);
 147                 ServerInstance->AddCommand(mycommand);
 148
 149                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCleanup, I_OnSyncUserMetaData, I_OnDecodeMetaData, I_OnUserDisconnect, I_OnUserConnect };
 150                 ServerInstance->Modules->Attach(eventlist, this, 7);
 151         }
 152
 153
 154         virtual void Prioritize()
 155         {
 156                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIO_FIRST);
 157         }
 158
 159         virtual void OnRehash(User* user, const std::string &parameter)
 160         {
 161                 ConfigReader Conf(ServerInstance);
 162
 163                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 164
 165                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 166                         NotifyOpers = true;
 167
 168                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 169                 {
 170                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 171                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 172                         std::string password = Conf.ReadValue("cgihost", "password", i);
 173
 174                         if(hostmask.length())
 175                         {
 176                                 if (type == "webirc" && !password.length()) {
 177                                                 ServerInstance->Log(DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 178                                 }
 179                                 else
 180                                 {
 181                                         CGItype cgitype = INVALID;
 182                                         if (type == "pass")
 183                                                 cgitype = PASS;
 184                                         else if (type == "ident")
 185                                                 cgitype = IDENT;
 186                                         else if (type == "passfirst")
 187                                                 cgitype = PASSFIRST;
 188                                         else if (type == "webirc")
 189                                         {
 190                                                 cgitype = WEBIRC;
 191                                         }
 192
 193                                         if (cgitype == INVALID)
 194                                                 cgitype = PASS;
 195
 196                                         Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 197                                 }
 198                         }
 199                         else
 200                         {
 201                                 ServerInstance->Log(DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 202                                 continue;
 203                         }
 204                 }
 205         }
 206
 207         virtual void OnCleanup(int target_type, void* item)
 208         {
 209                 if(target_type == TYPE_USER)
 210                 {
 211                         User* user = (User*)item;
 212                         std::string* realhost;
 213                         std::string* realip;
 214
 215                         if(user->GetExt("cgiirc_realhost", realhost))
 216                         {
 217                                 delete realhost;
 218                                 user->Shrink("cgiirc_realhost");
 219                         }
 220
 221                         if(user->GetExt("cgiirc_realip", realip))
 222                         {
 223                                 delete realip;
 224                                 user->Shrink("cgiirc_realip");
 225                         }
 226                 }
 227         }
 228
 229         virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 230         {
 231                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 232                 {
 233                         std::string* data;
 234
 235                         if(user->GetExt(extname, data))
 236                         {
 237                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 238                         }
 239                 }
 240         }
 241
 242         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 243         {
 244                 if(target_type == TYPE_USER)
 245                 {
 246                         User* dest = (User*)target;
 247                         std::string* bleh;
 248                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 249                         {
 250                                 dest->Extend(extname, new std::string(extdata));
 251                         }
 252                 }
 253         }
 254
 255         virtual void OnUserDisconnect(User* user)
 256         {
 257                 OnCleanup(TYPE_USER, user);
 258         }
 259
 260
 261         virtual int OnUserRegister(User* user)
 262         {
 263                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 264                 {
 265                         if(ServerInstance->MatchText(user->host, iter->hostmask) || ServerInstance->MatchText(user->GetIPString(), iter->hostmask))
 266                         {
 267                                 // Deal with it...
 268                                 if(iter->type == PASS)
 269                                 {
 270                                         CheckPass(user); // We do nothing if it fails so...
 271                                 }
 272                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 273                                 {
 274                                         // If the password lookup failed, try the ident
 275                                         CheckIdent(user);       // If this fails too, do nothing
 276                                 }
 277                                 else if(iter->type == IDENT)
 278                                 {
 279                                         CheckIdent(user); // Nothing on failure.
 280                                 }
 281                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 282                                 {
 283                                         // If the ident lookup fails, try the password.
 284                                         CheckPass(user);
 285                                 }
 286                                 else if(iter->type == WEBIRC)
 287                                 {
 288                                         // We don't need to do anything here
 289                                 }
 290                                 return 0;
 291                         }
 292                 }
 293                 return 0;
 294         }
 295
 296         virtual void OnUserConnect(User* user)
 297         {
 298                 std::string *webirc_hostname, *webirc_ip;
 299                 if(user->GetExt("cgiirc_webirc_hostname", webirc_hostname))
 300                 {
 301                         strlcpy(user->host,webirc_hostname->c_str(),63);
 302                         strlcpy(user->dhost,webirc_hostname->c_str(),63);
 303                         delete webirc_hostname;
 304                         user->InvalidateCache();
 305                         user->Shrink("cgiirc_webirc_hostname");
 306                 }
 307                 if(user->GetExt("cgiirc_webirc_ip", webirc_ip))
 308                 {
 309                         bool valid=false;
 310                         ServerInstance->Users->RemoveCloneCounts(user);
 311 #ifdef IPV6
 312                         valid = (inet_pton(AF_INET6, webirc_ip->c_str(), &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
 313
 314                         if(!valid)
 315                                 valid = (inet_aton(webirc_ip->c_str(), &((sockaddr_in*)user->ip)->sin_addr));
 316 #else
 317                         if (inet_aton(webirc_ip->c_str(), &((sockaddr_in*)user->ip)->sin_addr))
 318                                 valid = true;
 319 #endif
 320
 321                         delete webirc_ip;
 322                         user->InvalidateCache();
 323                         user->Shrink("cgiirc_webirc_ip");
 324                         ServerInstance->Users->AddLocalClone(user);
 325                         ServerInstance->Users->AddGlobalClone(user);
 326                         user->CheckClass();
 327                 }
 328         }
 329
 330         bool CheckPass(User* user)
 331         {
 332                 if(IsValidHost(user->password))
 333                 {
 334                         user->Extend("cgiirc_realhost", new std::string(user->host));
 335                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 336                         strlcpy(user->host, user->password, 64);
 337                         strlcpy(user->dhost, user->password, 64);
 338                         user->InvalidateCache();
 339
 340                         bool valid = false;
 341                         ServerInstance->Users->RemoveCloneCounts(user);
 342 #ifdef IPV6
 343                         if (user->GetProtocolFamily() == AF_INET6)
 344                                 valid = (inet_pton(AF_INET6, user->password, &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
 345                         else
 346                                 valid = (inet_aton(user->password, &((sockaddr_in*)user->ip)->sin_addr));
 347 #else
 348                         if (inet_aton(user->password, &((sockaddr_in*)user->ip)->sin_addr))
 349                                 valid = true;
 350 #endif
 351                         ServerInstance->Users->AddLocalClone(user);
 352                         ServerInstance->Users->AddGlobalClone(user);
 353                         user->CheckClass();
 354
 355                         if (valid)
 356                         {
 357                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 358                                 if(NotifyOpers)
 359                                         ServerInstance->SNO->WriteToSnoMask('A', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);
 360                         }
 361                         else
 362                         {
 363                                 /* We got as resolved hostname in the password. */
 364                                 try
 365                                 {
 366
 367                                         bool cached;
 368                                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
 369                                         ServerInstance->AddResolver(r, cached);
 370                                 }
 371                                 catch (...)
 372                                 {
 373                                         if (NotifyOpers)
 374                                                 ServerInstance->SNO->WriteToSnoMask('A', "Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 375                                 }
 376                         }
 377
 378                         *user->password = 0;
 379
 380                         /*if(NotifyOpers)
 381                                 ServerInstance->SNO->WriteToSnoMask('A', "Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);*/
 382
 383                         return true;
 384                 }
 385
 386                 return false;
 387         }
 388
 389         bool CheckIdent(User* user)
 390         {
 391                 int ip[4];
 392                 char* ident;
 393                 char newip[16];
 394                 int len = strlen(user->ident);
 395
 396                 if(len == 8)
 397                         ident = user->ident;
 398                 else if(len == 9 && *user->ident == '~')
 399                         ident = user->ident+1;
 400                 else
 401                         return false;
 402
 403                 for(int i = 0; i < 4; i++)
 404                         if(!HexToInt(ip[i], ident + i*2))
 405                                 return false;
 406
 407                 snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
 408
 409                 user->Extend("cgiirc_realhost", new std::string(user->host));
 410                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 411                 ServerInstance->Users->RemoveCloneCounts(user);
 412 #ifdef IPV6
 413                 if (user->GetProtocolFamily() == AF_INET6)
 414                         inet_pton(AF_INET6, newip, &((sockaddr_in6*)user->ip)->sin6_addr);
 415                 else
 416 #endif
 417                 inet_aton(newip, &((sockaddr_in*)user->ip)->sin_addr);
 418                 ServerInstance->Users->AddLocalClone(user);
 419                 ServerInstance->Users->AddGlobalClone(user);
 420                 user->CheckClass();
 421                 try
 422                 {
 423                         strlcpy(user->host, newip, 16);
 424                         strlcpy(user->dhost, newip, 16);
 425                         strlcpy(user->ident, "~cgiirc", 8);
 426
 427                         bool cached;
 428                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newip, false, user, user->GetFd(), "IDENT", cached);
 429                         ServerInstance->AddResolver(r, cached);
 430                 }
 431                 catch (...)
 432                 {
 433                         strlcpy(user->host, newip, 16);
 434                         strlcpy(user->dhost, newip, 16);
 435                         strlcpy(user->ident, "~cgiirc", 8);
 436                         user->InvalidateCache();
 437
 438                         if(NotifyOpers)
 439                                  ServerInstance->SNO->WriteToSnoMask('A', "Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 440                 }
 441                 /*strlcpy(user->host, newip, 16);
 442                 strlcpy(user->dhost, newip, 16);
 443                 strlcpy(user->ident, "~cgiirc", 8);*/
 444
 445                 return true;
 446         }
 447
 448         bool IsValidHost(const std::string &host)
 449         {
 450                 if(!host.size())
 451                         return false;
 452
 453                 for(unsigned int i = 0; i < host.size(); i++)
 454                 {
 455                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 456                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 457                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 458                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 459                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 460
 461                                 continue;
 462                         else
 463                                 return false;
 464                 }
 465
 466                 return true;
 467         }
 468
 469         bool IsValidIP(const std::string &ip)
 470         {
 471                 if(ip.size() < 7 || ip.size() > 15)
 472                         return false;
 473
 474                 short sincedot = 0;
 475                 short dots = 0;
 476
 477                 for(unsigned int i = 0; i < ip.size(); i++)
 478                 {
 479                         if((dots <= 3) && (sincedot <= 3))
 480                         {
 481                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 482                                 {
 483                                         sincedot++;
 484                                 }
 485                                 else if(ip[i] == '.')
 486                                 {
 487                                         sincedot = 0;
 488                                         dots++;
 489                                 }
 490                         }
 491                         else
 492                         {
 493                                 return false;
 494
 495                         }
 496                 }
 497
 498                 if(dots != 3)
 499                         return false;
 500
 501                 return true;
 502         }
 503
 504         bool HexToInt(int &out, const char* in)
 505         {
 506                 char ip[3];
 507                 ip[0] = in[0];
 508                 ip[1] = in[1];
 509                 ip[2] = 0;
 510                 out = strtol(ip, NULL, 16);
 511
 512                 if(out > 255 || out < 0)
 513                         return false;
 514
 515                 return true;
 516         }
 517
 518         virtual ~ModuleCgiIRC()
 519         {
 520         }
 521
 522         virtual Version GetVersion()
 523         {
 524                 return Version(1,1,0,0,VF_VENDOR,API_VERSION);
 525         }
 526
 527 };
 528
 529 MODULE_INIT(ModuleCgiIRC)