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                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCleanup, I_OnSyncUserMetaData, I_OnDecodeMetaData, I_OnUserQuit, I_OnUserConnect };
 137                 ServerInstance->Modules->Attach(eventlist, this, 7);
 138         }
 139
 140         void Implements(char* List)
 141         {
 142                 List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCleanup] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUserQuit] = List[I_OnUserConnect] = 1;
 143         }
 144
 145         virtual void Prioritize()
 146         {
 147                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIO_FIRST);
 148         }
 149
 150         virtual void OnRehash(User* user, const std::string &parameter)
 151         {
 152                 ConfigReader Conf(ServerInstance);
 153
 154                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 155
 156                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 157                         NotifyOpers = true;
 158
 159                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 160                 {
 161                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 162                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 163                         std::string password = Conf.ReadValue("cgihost", "password", i);
 164
 165                         if(hostmask.length())
 166                         {
 167                                 if (type == "webirc" && !password.length()) {
 168                                                 ServerInstance->Log(DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 169                                 }
 170                                 else
 171                                 {
 172                                         CGItype cgitype = INVALID;
 173                                         if (type == "pass")
 174                                                 cgitype = PASS;
 175                                         else if (type == "ident")
 176                                                 cgitype = IDENT;
 177                                         else if (type == "passfirst")
 178                                                 cgitype = PASSFIRST;
 179                                         else if (type == "webirc")
 180                                         {
 181                                                 cgitype = WEBIRC;
 182                                         }
 183
 184                                         if (cgitype == INVALID)
 185                                                 cgitype = PASS;
 186
 187                                         Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 188                                 }
 189                         }
 190                         else
 191                         {
 192                                 ServerInstance->Log(DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 193                                 continue;
 194                         }
 195                 }
 196         }
 197
 198         virtual void OnCleanup(int target_type, void* item)
 199         {
 200                 if(target_type == TYPE_USER)
 201                 {
 202                         User* user = (User*)item;
 203                         std::string* realhost;
 204                         std::string* realip;
 205
 206                         if(user->GetExt("cgiirc_realhost", realhost))
 207                         {
 208                                 delete realhost;
 209                                 user->Shrink("cgiirc_realhost");
 210                         }
 211
 212                         if(user->GetExt("cgiirc_realip", realip))
 213                         {
 214                                 delete realip;
 215                                 user->Shrink("cgiirc_realip");
 216                         }
 217                 }
 218         }
 219
 220         virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 221         {
 222                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 223                 {
 224                         std::string* data;
 225
 226                         if(user->GetExt(extname, data))
 227                         {
 228                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 229                         }
 230                 }
 231         }
 232
 233         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 234         {
 235                 if(target_type == TYPE_USER)
 236                 {
 237                         User* dest = (User*)target;
 238                         std::string* bleh;
 239                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 240                         {
 241                                 dest->Extend(extname, new std::string(extdata));
 242                         }
 243                 }
 244         }
 245
 246         virtual void OnUserQuit(User* user, const std::string &message, const std::string &oper_message)
 247         {
 248                 OnCleanup(TYPE_USER, user);
 249         }
 250
 251
 252         virtual int OnUserRegister(User* user)
 253         {
 254                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 255                 {
 256                         if(ServerInstance->MatchText(user->host, iter->hostmask) || ServerInstance->MatchText(user->GetIPString(), iter->hostmask))
 257                         {
 258                                 // Deal with it...
 259                                 if(iter->type == PASS)
 260                                 {
 261                                         CheckPass(user); // We do nothing if it fails so...
 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                                 }
 268                                 else if(iter->type == IDENT)
 269                                 {
 270                                         CheckIdent(user); // Nothing on failure.
 271                                 }
 272                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 273                                 {
 274                                         // If the ident lookup fails, try the password.
 275                                         CheckPass(user);
 276                                 }
 277                                 else if(iter->type == WEBIRC)
 278                                 {
 279                                         // We don't need to do anything here
 280                                 }
 281                                 return 0;
 282                         }
 283                 }
 284                 return 0;
 285         }
 286
 287         virtual void OnUserConnect(User* user)
 288         {
 289                 std::string *webirc_hostname, *webirc_ip;
 290                 if(user->GetExt("cgiirc_webirc_hostname", webirc_hostname))
 291                 {
 292                         strlcpy(user->host,webirc_hostname->c_str(),63);
 293                         strlcpy(user->dhost,webirc_hostname->c_str(),63);
 294                         delete webirc_hostname;
 295                         user->InvalidateCache();
 296                         user->Shrink("cgiirc_webirc_hostname");
 297                 }
 298                 if(user->GetExt("cgiirc_webirc_ip", webirc_ip))
 299                 {
 300                         bool valid=false;
 301                         user->RemoveCloneCounts();
 302 #ifdef IPV6
 303                         valid = (inet_pton(AF_INET6, webirc_ip->c_str(), &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
 304
 305                         if(!valid)
 306                                 valid = (inet_aton(webirc_ip->c_str(), &((sockaddr_in*)user->ip)->sin_addr));
 307 #else
 308                         if (inet_aton(webirc_ip->c_str(), &((sockaddr_in*)user->ip)->sin_addr))
 309                                 valid = true;
 310 #endif
 311
 312                         delete webirc_ip;
 313                         user->InvalidateCache();
 314                         user->Shrink("cgiirc_webirc_ip");
 315                         ServerInstance->AddLocalClone(user);
 316                         ServerInstance->AddGlobalClone(user);
 317                         user->CheckClass();
 318                 }
 319         }
 320
 321         bool CheckPass(User* user)
 322         {
 323                 if(IsValidHost(user->password))
 324                 {
 325                         user->Extend("cgiirc_realhost", new std::string(user->host));
 326                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 327                         strlcpy(user->host, user->password, 64);
 328                         strlcpy(user->dhost, user->password, 64);
 329                         user->InvalidateCache();
 330
 331                         bool valid = false;
 332                         user->RemoveCloneCounts();
 333 #ifdef IPV6
 334                         if (user->GetProtocolFamily() == AF_INET6)
 335                                 valid = (inet_pton(AF_INET6, user->password, &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
 336                         else
 337                                 valid = (inet_aton(user->password, &((sockaddr_in*)user->ip)->sin_addr));
 338 #else
 339                         if (inet_aton(user->password, &((sockaddr_in*)user->ip)->sin_addr))
 340                                 valid = true;
 341 #endif
 342                         ServerInstance->AddLocalClone(user);
 343                         ServerInstance->AddGlobalClone(user);
 344                         user->CheckClass();
 345
 346                         if (valid)
 347                         {
 348                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 349                                 if(NotifyOpers)
 350                                         ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);
 351                         }
 352                         else
 353                         {
 354                                 /* We got as resolved hostname in the password. */
 355                                 try
 356                                 {
 357
 358                                         bool cached;
 359                                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
 360                                         ServerInstance->AddResolver(r, cached);
 361                                 }
 362                                 catch (...)
 363                                 {
 364                                         if (NotifyOpers)
 365                                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 366                                 }
 367                         }
 368
 369                         *user->password = 0;
 370
 371                         /*if(NotifyOpers)
 372                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);*/
 373
 374                         return true;
 375                 }
 376
 377                 return false;
 378         }
 379
 380         bool CheckIdent(User* user)
 381         {
 382                 int ip[4];
 383                 char* ident;
 384                 char newip[16];
 385                 int len = strlen(user->ident);
 386
 387                 if(len == 8)
 388                         ident = user->ident;
 389                 else if(len == 9 && *user->ident == '~')
 390                         ident = user->ident+1;
 391                 else
 392                         return false;
 393
 394                 for(int i = 0; i < 4; i++)
 395                         if(!HexToInt(ip[i], ident + i*2))
 396                                 return false;
 397
 398                 snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
 399
 400                 user->Extend("cgiirc_realhost", new std::string(user->host));
 401                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 402                 user->RemoveCloneCounts();
 403 #ifdef IPV6
 404                 if (user->GetProtocolFamily() == AF_INET6)
 405                         inet_pton(AF_INET6, newip, &((sockaddr_in6*)user->ip)->sin6_addr);
 406                 else
 407 #endif
 408                 inet_aton(newip, &((sockaddr_in*)user->ip)->sin_addr);
 409                 ServerInstance->AddLocalClone(user);
 410                 ServerInstance->AddGlobalClone(user);
 411                 user->CheckClass();
 412                 try
 413                 {
 414                         strlcpy(user->host, newip, 16);
 415                         strlcpy(user->dhost, newip, 16);
 416                         strlcpy(user->ident, "~cgiirc", 8);
 417
 418                         bool cached;
 419                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newip, false, user, user->GetFd(), "IDENT", cached);
 420                         ServerInstance->AddResolver(r, cached);
 421                 }
 422                 catch (...)
 423                 {
 424                         strlcpy(user->host, newip, 16);
 425                         strlcpy(user->dhost, newip, 16);
 426                         strlcpy(user->ident, "~cgiirc", 8);
 427                         user->InvalidateCache();
 428
 429                         if(NotifyOpers)
 430                                  ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 431                 }
 432                 /*strlcpy(user->host, newip, 16);
 433                 strlcpy(user->dhost, newip, 16);
 434                 strlcpy(user->ident, "~cgiirc", 8);*/
 435
 436                 return true;
 437         }
 438
 439         bool IsValidHost(const std::string &host)
 440         {
 441                 if(!host.size())
 442                         return false;
 443
 444                 for(unsigned int i = 0; i < host.size(); i++)
 445                 {
 446                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 447                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 448                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 449                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 450                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 451
 452                                 continue;
 453                         else
 454                                 return false;
 455                 }
 456
 457                 return true;
 458         }
 459
 460         bool IsValidIP(const std::string &ip)
 461         {
 462                 if(ip.size() < 7 || ip.size() > 15)
 463                         return false;
 464
 465                 short sincedot = 0;
 466                 short dots = 0;
 467
 468                 for(unsigned int i = 0; i < ip.size(); i++)
 469                 {
 470                         if((dots <= 3) && (sincedot <= 3))
 471                         {
 472                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 473                                 {
 474                                         sincedot++;
 475                                 }
 476                                 else if(ip[i] == '.')
 477                                 {
 478                                         sincedot = 0;
 479                                         dots++;
 480                                 }
 481                         }
 482                         else
 483                         {
 484                                 return false;
 485
 486                         }
 487                 }
 488
 489                 if(dots != 3)
 490                         return false;
 491
 492                 return true;
 493         }
 494
 495         bool HexToInt(int &out, const char* in)
 496         {
 497                 char ip[3];
 498                 ip[0] = in[0];
 499                 ip[1] = in[1];
 500                 ip[2] = 0;
 501                 out = strtol(ip, NULL, 16);
 502
 503                 if(out > 255 || out < 0)
 504                         return false;
 505
 506                 return true;
 507         }
 508
 509         virtual ~ModuleCgiIRC()
 510         {
 511         }
 512
 513         virtual Version GetVersion()
 514         {
 515                 return Version(1,1,0,0,VF_VENDOR,API_VERSION);
 516         }
 517
 518 };
 519
 520 MODULE_INIT(ModuleCgiIRC)