src/modules/m_cgiirc.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 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 &password ="")
  37         : hostmask(mask), type(t), password(password)
  38         {
  39         }
  40 };
  41 typedef std::vector<CGIhost> CGIHostlist;
  42
  43 class CommandWebirc : public Command
  44 {
  45         InspIRCd* Me;
  46         CGIHostlist Hosts;
  47         bool notify;
  48         public:
  49                 CommandWebirc(InspIRCd* Me, CGIHostlist &Hosts, bool notify) : Command(Me, "WEBIRC", 0, 4, true), Hosts(Hosts), notify(notify)
  50                 {
  51                         this->source = "m_cgiirc.so";
  52                         this->syntax = "password client hostname ip";
  53                 }
  54                 CmdResult Handle(const char** parameters, int pcnt, User *user)
  55                 {
  56                         if(user->registered == REG_ALL)
  57                                 return CMD_FAILURE;
  58
  59                         for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
  60                         {
  61                                 if(ServerInstance->MatchText(user->host, iter->hostmask) || ServerInstance->MatchText(user->GetIPString(), iter->hostmask))
  62                                 {
  63                                         if(iter->type == WEBIRC && parameters[0] == iter->password)
  64                                         {
  65                                                 user->Extend("cgiirc_realhost", new std::string(user->host));
  66                                                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
  67                                                 if (notify)
  68                                                         ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from %s", user->nick, user->host, parameters[2], user->host);
  69                                                 user->Extend("cgiirc_webirc_hostname", new std::string(parameters[2]));
  70                                                 user->Extend("cgiirc_webirc_ip", new std::string(parameters[3]));
  71                                                 return CMD_LOCALONLY;
  72                                         }
  73                                 }
  74                         }
  75                         return CMD_FAILURE;
  76                 }
  77 };
  78
  79
  80 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
  81  */
  82 class CGIResolver : public Resolver
  83 {
  84         std::string typ;
  85         int theirfd;
  86         User* them;
  87         bool notify;
  88  public:
  89         CGIResolver(Module* me, InspIRCd* ServerInstance, bool NotifyOpers, const std::string &source, bool forward, User* u, int userfd, const std::string &type, bool &cached)
  90                 : Resolver(ServerInstance, source, forward ? DNS_QUERY_A : DNS_QUERY_PTR4, cached, me), typ(type), theirfd(userfd), them(u), notify(NotifyOpers) { }
  91
  92         virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached, int resultnum = 0)
  93         {
  94                 if (resultnum)
  95                         return;
  96
  97                 /* Check the user still exists */
  98                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
  99                 {
 100                         if (notify)
 101                                 ServerInstance->WriteOpers("*** 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());
 102
 103                         strlcpy(them->host, result.c_str(), 63);
 104                         strlcpy(them->dhost, result.c_str(), 63);
 105                         strlcpy(them->ident, "~cgiirc", 8);
 106                         them->InvalidateCache();
 107                 }
 108         }
 109
 110         virtual void OnError(ResolverError e, const std::string &errormessage)
 111         {
 112                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
 113                 {
 114                         if (notify)
 115                                 ServerInstance->WriteOpers("*** 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());
 116                 }
 117         }
 118
 119         virtual ~CGIResolver()
 120         {
 121         }
 122 };
 123
 124 class ModuleCgiIRC : public Module
 125 {
 126         CommandWebirc* mycommand;
 127         bool NotifyOpers;
 128         CGIHostlist Hosts;
 129 public:
 130         ModuleCgiIRC(InspIRCd* Me) : Module(Me)
 131         {
 132
 133                 OnRehash(NULL,"");
 134                 mycommand=new CommandWebirc(Me, Hosts, NotifyOpers);
 135                 ServerInstance->AddCommand(mycommand);
 136         }
 137
 138         void Implements(char* List)
 139         {
 140                 List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCleanup] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUserQuit] = List[I_OnUserConnect] = 1;
 141         }
 142
 143         virtual void Prioritize()
 144         {
 145                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIO_FIRST);
 146         }
 147
 148         virtual void OnRehash(User* user, const std::string &parameter)
 149         {
 150                 ConfigReader Conf(ServerInstance);
 151
 152                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 153
 154                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 155                         NotifyOpers = true;
 156
 157                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 158                 {
 159                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 160                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 161                         std::string password = Conf.ReadValue("cgihost", "password", i);
 162
 163                         if(hostmask.length())
 164                         {
 165                                 if (type == "webirc" && !password.length()) {
 166                                                 ServerInstance->Log(DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 167                                 }
 168                                 else
 169                                 {
 170                                         CGItype cgitype = INVALID;
 171                                         if (type == "pass")
 172                                                 cgitype = PASS;
 173                                         else if (type == "ident")
 174                                                 cgitype = IDENT;
 175                                         else if (type == "passfirst")
 176                                                 cgitype = PASSFIRST;
 177                                         else if (type == "webirc")
 178                                         {
 179                                                 cgitype = WEBIRC;
 180                                         }
 181
 182                                         if (cgitype == INVALID)
 183                                                 cgitype = PASS;
 184
 185                                         Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 186                                 }
 187                         }
 188                         else
 189                         {
 190                                 ServerInstance->Log(DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 191                                 continue;
 192                         }
 193                 }
 194         }
 195
 196         virtual void OnCleanup(int target_type, void* item)
 197         {
 198                 if(target_type == TYPE_USER)
 199                 {
 200                         User* user = (User*)item;
 201                         std::string* realhost;
 202                         std::string* realip;
 203
 204                         if(user->GetExt("cgiirc_realhost", realhost))
 205                         {
 206                                 delete realhost;
 207                                 user->Shrink("cgiirc_realhost");
 208                         }
 209
 210                         if(user->GetExt("cgiirc_realip", realip))
 211                         {
 212                                 delete realip;
 213                                 user->Shrink("cgiirc_realip");
 214                         }
 215                 }
 216         }
 217
 218         virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 219         {
 220                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 221                 {
 222                         std::string* data;
 223
 224                         if(user->GetExt(extname, data))
 225                         {
 226                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 227                         }
 228                 }
 229         }
 230
 231         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 232         {
 233                 if(target_type == TYPE_USER)
 234                 {
 235                         User* dest = (User*)target;
 236                         std::string* bleh;
 237                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 238                         {
 239                                 dest->Extend(extname, new std::string(extdata));
 240                         }
 241                 }
 242         }
 243
 244         virtual void OnUserQuit(User* user, const std::string &message, const std::string &oper_message)
 245         {
 246                 OnCleanup(TYPE_USER, user);
 247         }
 248
 249
 250         virtual int OnUserRegister(User* user)
 251         {
 252                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 253                 {
 254                         if(ServerInstance->MatchText(user->host, iter->hostmask) || ServerInstance->MatchText(user->GetIPString(), iter->hostmask))
 255                         {
 256                                 // Deal with it...
 257                                 if(iter->type == PASS)
 258                                 {
 259                                         CheckPass(user); // We do nothing if it fails so...
 260                                 }
 261                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 262                                 {
 263                                         // If the password lookup failed, try the ident
 264                                         CheckIdent(user);       // If this fails too, do nothing
 265                                 }
 266                                 else if(iter->type == IDENT)
 267                                 {
 268                                         CheckIdent(user); // Nothing on failure.
 269                                 }
 270                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 271                                 {
 272                                         // If the ident lookup fails, try the password.
 273                                         CheckPass(user);
 274                                 }
 275                                 else if(iter->type == WEBIRC)
 276                                 {
 277                                         // We don't need to do anything here
 278                                 }
 279                                 return 0;
 280                         }
 281                 }
 282                 return 0;
 283         }
 284
 285         virtual void OnUserConnect(User* user)
 286         {
 287                 std::string *webirc_hostname, *webirc_ip;
 288                 if(user->GetExt("cgiirc_webirc_hostname", webirc_hostname))
 289                 {
 290                         strlcpy(user->host,webirc_hostname->c_str(),63);
 291                         strlcpy(user->dhost,webirc_hostname->c_str(),63);
 292                         delete webirc_hostname;
 293                         user->InvalidateCache();
 294                         user->Shrink("cgiirc_webirc_hostname");
 295                 }
 296                 if(user->GetExt("cgiirc_webirc_ip", webirc_ip))
 297                 {
 298                         bool valid=false;
 299                         user->RemoveCloneCounts();
 300 #ifdef IPV6
 301                         valid = (inet_pton(AF_INET6, webirc_ip->c_str(), &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
 302
 303                         if(!valid)
 304                                 valid = (inet_aton(webirc_ip->c_str(), &((sockaddr_in*)user->ip)->sin_addr));
 305 #else
 306                         if (inet_aton(webirc_ip->c_str(), &((sockaddr_in*)user->ip)->sin_addr))
 307                                 valid = true;
 308 #endif
 309
 310                         delete webirc_ip;
 311                         user->InvalidateCache();
 312                         user->Shrink("cgiirc_webirc_ip");
 313                         ServerInstance->AddLocalClone(user);
 314                         ServerInstance->AddGlobalClone(user);
 315                         user->CheckClass();
 316                 }
 317         }
 318
 319         bool CheckPass(User* user)
 320         {
 321                 if(IsValidHost(user->password))
 322                 {
 323                         user->Extend("cgiirc_realhost", new std::string(user->host));
 324                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 325                         strlcpy(user->host, user->password, 64);
 326                         strlcpy(user->dhost, user->password, 64);
 327                         user->InvalidateCache();
 328
 329                         bool valid = false;
 330                         user->RemoveCloneCounts();
 331 #ifdef IPV6
 332                         if (user->GetProtocolFamily() == AF_INET6)
 333                                 valid = (inet_pton(AF_INET6, user->password, &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
 334                         else
 335                                 valid = (inet_aton(user->password, &((sockaddr_in*)user->ip)->sin_addr));
 336 #else
 337                         if (inet_aton(user->password, &((sockaddr_in*)user->ip)->sin_addr))
 338                                 valid = true;
 339 #endif
 340                         ServerInstance->AddLocalClone(user);
 341                         ServerInstance->AddGlobalClone(user);
 342                         user->CheckClass();
 343
 344                         if (valid)
 345                         {
 346                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 347                                 if(NotifyOpers)
 348                                         ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);
 349                         }
 350                         else
 351                         {
 352                                 /* We got as resolved hostname in the password. */
 353                                 try
 354                                 {
 355
 356                                         bool cached;
 357                                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
 358                                         ServerInstance->AddResolver(r, cached);
 359                                 }
 360                                 catch (...)
 361                                 {
 362                                         if (NotifyOpers)
 363                                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 364                                 }
 365                         }
 366
 367                         *user->password = 0;
 368
 369                         /*if(NotifyOpers)
 370                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);*/
 371
 372                         return true;
 373                 }
 374
 375                 return false;
 376         }
 377
 378         bool CheckIdent(User* user)
 379         {
 380                 int ip[4];
 381                 char* ident;
 382                 char newip[16];
 383                 int len = strlen(user->ident);
 384
 385                 if(len == 8)
 386                         ident = user->ident;
 387                 else if(len == 9 && *user->ident == '~')
 388                         ident = user->ident+1;
 389                 else
 390                         return false;
 391
 392                 for(int i = 0; i < 4; i++)
 393                         if(!HexToInt(ip[i], ident + i*2))
 394                                 return false;
 395
 396                 snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
 397
 398                 user->Extend("cgiirc_realhost", new std::string(user->host));
 399                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 400                 user->RemoveCloneCounts();
 401 #ifdef IPV6
 402                 if (user->GetProtocolFamily() == AF_INET6)
 403                         inet_pton(AF_INET6, newip, &((sockaddr_in6*)user->ip)->sin6_addr);
 404                 else
 405 #endif
 406                 inet_aton(newip, &((sockaddr_in*)user->ip)->sin_addr);
 407                 ServerInstance->AddLocalClone(user);
 408                 ServerInstance->AddGlobalClone(user);
 409                 user->CheckClass();
 410                 try
 411                 {
 412                         strlcpy(user->host, newip, 16);
 413                         strlcpy(user->dhost, newip, 16);
 414                         strlcpy(user->ident, "~cgiirc", 8);
 415
 416                         bool cached;
 417                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newip, false, user, user->GetFd(), "IDENT", cached);
 418                         ServerInstance->AddResolver(r, cached);
 419                 }
 420                 catch (...)
 421                 {
 422                         strlcpy(user->host, newip, 16);
 423                         strlcpy(user->dhost, newip, 16);
 424                         strlcpy(user->ident, "~cgiirc", 8);
 425                         user->InvalidateCache();
 426
 427                         if(NotifyOpers)
 428                                  ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 429                 }
 430                 /*strlcpy(user->host, newip, 16);
 431                 strlcpy(user->dhost, newip, 16);
 432                 strlcpy(user->ident, "~cgiirc", 8);*/
 433
 434                 return true;
 435         }
 436
 437         bool IsValidHost(const std::string &host)
 438         {
 439                 if(!host.size())
 440                         return false;
 441
 442                 for(unsigned int i = 0; i < host.size(); i++)
 443                 {
 444                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 445                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 446                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 447                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 448                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 449
 450                                 continue;
 451                         else
 452                                 return false;
 453                 }
 454
 455                 return true;
 456         }
 457
 458         bool IsValidIP(const std::string &ip)
 459         {
 460                 if(ip.size() < 7 || ip.size() > 15)
 461                         return false;
 462
 463                 short sincedot = 0;
 464                 short dots = 0;
 465
 466                 for(unsigned int i = 0; i < ip.size(); i++)
 467                 {
 468                         if((dots <= 3) && (sincedot <= 3))
 469                         {
 470                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 471                                 {
 472                                         sincedot++;
 473                                 }
 474                                 else if(ip[i] == '.')
 475                                 {
 476                                         sincedot = 0;
 477                                         dots++;
 478                                 }
 479                         }
 480                         else
 481                         {
 482                                 return false;
 483
 484                         }
 485                 }
 486
 487                 if(dots != 3)
 488                         return false;
 489
 490                 return true;
 491         }
 492
 493         bool HexToInt(int &out, const char* in)
 494         {
 495                 char ip[3];
 496                 ip[0] = in[0];
 497                 ip[1] = in[1];
 498                 ip[2] = 0;
 499                 out = strtol(ip, NULL, 16);
 500
 501                 if(out > 255 || out < 0)
 502                         return false;
 503
 504                 return true;
 505         }
 506
 507         virtual ~ModuleCgiIRC()
 508         {
 509         }
 510
 511         virtual Version GetVersion()
 512         {
 513                 return Version(1,1,0,0,VF_VENDOR,API_VERSION);
 514         }
 515
 516 };
 517
 518 MODULE_INIT(ModuleCgiIRC)