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
 141         virtual void Prioritize()
 142         {
 143                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIO_FIRST);
 144         }
 145
 146         virtual void OnRehash(User* user, const std::string &parameter)
 147         {
 148                 ConfigReader Conf(ServerInstance);
 149
 150                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 151
 152                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 153                         NotifyOpers = true;
 154
 155                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 156                 {
 157                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 158                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 159                         std::string password = Conf.ReadValue("cgihost", "password", i);
 160
 161                         if(hostmask.length())
 162                         {
 163                                 if (type == "webirc" && !password.length()) {
 164                                                 ServerInstance->Log(DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 165                                 }
 166                                 else
 167                                 {
 168                                         CGItype cgitype = INVALID;
 169                                         if (type == "pass")
 170                                                 cgitype = PASS;
 171                                         else if (type == "ident")
 172                                                 cgitype = IDENT;
 173                                         else if (type == "passfirst")
 174                                                 cgitype = PASSFIRST;
 175                                         else if (type == "webirc")
 176                                         {
 177                                                 cgitype = WEBIRC;
 178                                         }
 179
 180                                         if (cgitype == INVALID)
 181                                                 cgitype = PASS;
 182
 183                                         Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 184                                 }
 185                         }
 186                         else
 187                         {
 188                                 ServerInstance->Log(DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 189                                 continue;
 190                         }
 191                 }
 192         }
 193
 194         virtual void OnCleanup(int target_type, void* item)
 195         {
 196                 if(target_type == TYPE_USER)
 197                 {
 198                         User* user = (User*)item;
 199                         std::string* realhost;
 200                         std::string* realip;
 201
 202                         if(user->GetExt("cgiirc_realhost", realhost))
 203                         {
 204                                 delete realhost;
 205                                 user->Shrink("cgiirc_realhost");
 206                         }
 207
 208                         if(user->GetExt("cgiirc_realip", realip))
 209                         {
 210                                 delete realip;
 211                                 user->Shrink("cgiirc_realip");
 212                         }
 213                 }
 214         }
 215
 216         virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 217         {
 218                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 219                 {
 220                         std::string* data;
 221
 222                         if(user->GetExt(extname, data))
 223                         {
 224                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 225                         }
 226                 }
 227         }
 228
 229         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 230         {
 231                 if(target_type == TYPE_USER)
 232                 {
 233                         User* dest = (User*)target;
 234                         std::string* bleh;
 235                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 236                         {
 237                                 dest->Extend(extname, new std::string(extdata));
 238                         }
 239                 }
 240         }
 241
 242         virtual void OnUserQuit(User* user, const std::string &message, const std::string &oper_message)
 243         {
 244                 OnCleanup(TYPE_USER, user);
 245         }
 246
 247
 248         virtual int OnUserRegister(User* user)
 249         {
 250                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 251                 {
 252                         if(ServerInstance->MatchText(user->host, iter->hostmask) || ServerInstance->MatchText(user->GetIPString(), iter->hostmask))
 253                         {
 254                                 // Deal with it...
 255                                 if(iter->type == PASS)
 256                                 {
 257                                         CheckPass(user); // We do nothing if it fails so...
 258                                 }
 259                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 260                                 {
 261                                         // If the password lookup failed, try the ident
 262                                         CheckIdent(user);       // If this fails too, do nothing
 263                                 }
 264                                 else if(iter->type == IDENT)
 265                                 {
 266                                         CheckIdent(user); // Nothing on failure.
 267                                 }
 268                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 269                                 {
 270                                         // If the ident lookup fails, try the password.
 271                                         CheckPass(user);
 272                                 }
 273                                 else if(iter->type == WEBIRC)
 274                                 {
 275                                         // We don't need to do anything here
 276                                 }
 277                                 return 0;
 278                         }
 279                 }
 280                 return 0;
 281         }
 282
 283         virtual void OnUserConnect(User* user)
 284         {
 285                 std::string *webirc_hostname, *webirc_ip;
 286                 if(user->GetExt("cgiirc_webirc_hostname", webirc_hostname))
 287                 {
 288                         strlcpy(user->host,webirc_hostname->c_str(),63);
 289                         strlcpy(user->dhost,webirc_hostname->c_str(),63);
 290                         delete webirc_hostname;
 291                         user->InvalidateCache();
 292                         user->Shrink("cgiirc_webirc_hostname");
 293                 }
 294                 if(user->GetExt("cgiirc_webirc_ip", webirc_ip))
 295                 {
 296                         bool valid=false;
 297                         user->RemoveCloneCounts();
 298 #ifdef IPV6
 299                         valid = (inet_pton(AF_INET6, webirc_ip->c_str(), &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
 300
 301                         if(!valid)
 302                                 valid = (inet_aton(webirc_ip->c_str(), &((sockaddr_in*)user->ip)->sin_addr));
 303 #else
 304                         if (inet_aton(webirc_ip->c_str(), &((sockaddr_in*)user->ip)->sin_addr))
 305                                 valid = true;
 306 #endif
 307
 308                         delete webirc_ip;
 309                         user->InvalidateCache();
 310                         user->Shrink("cgiirc_webirc_ip");
 311                         ServerInstance->AddLocalClone(user);
 312                         ServerInstance->AddGlobalClone(user);
 313                         user->CheckClass();
 314                 }
 315         }
 316
 317         bool CheckPass(User* user)
 318         {
 319                 if(IsValidHost(user->password))
 320                 {
 321                         user->Extend("cgiirc_realhost", new std::string(user->host));
 322                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 323                         strlcpy(user->host, user->password, 64);
 324                         strlcpy(user->dhost, user->password, 64);
 325                         user->InvalidateCache();
 326
 327                         bool valid = false;
 328                         user->RemoveCloneCounts();
 329 #ifdef IPV6
 330                         if (user->GetProtocolFamily() == AF_INET6)
 331                                 valid = (inet_pton(AF_INET6, user->password, &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
 332                         else
 333                                 valid = (inet_aton(user->password, &((sockaddr_in*)user->ip)->sin_addr));
 334 #else
 335                         if (inet_aton(user->password, &((sockaddr_in*)user->ip)->sin_addr))
 336                                 valid = true;
 337 #endif
 338                         ServerInstance->AddLocalClone(user);
 339                         ServerInstance->AddGlobalClone(user);
 340                         user->CheckClass();
 341
 342                         if (valid)
 343                         {
 344                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 345                                 if(NotifyOpers)
 346                                         ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);
 347                         }
 348                         else
 349                         {
 350                                 /* We got as resolved hostname in the password. */
 351                                 try
 352                                 {
 353
 354                                         bool cached;
 355                                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
 356                                         ServerInstance->AddResolver(r, cached);
 357                                 }
 358                                 catch (...)
 359                                 {
 360                                         if (NotifyOpers)
 361                                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 362                                 }
 363                         }
 364
 365                         *user->password = 0;
 366
 367                         /*if(NotifyOpers)
 368                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);*/
 369
 370                         return true;
 371                 }
 372
 373                 return false;
 374         }
 375
 376         bool CheckIdent(User* user)
 377         {
 378                 int ip[4];
 379                 char* ident;
 380                 char newip[16];
 381                 int len = strlen(user->ident);
 382
 383                 if(len == 8)
 384                         ident = user->ident;
 385                 else if(len == 9 && *user->ident == '~')
 386                         ident = user->ident+1;
 387                 else
 388                         return false;
 389
 390                 for(int i = 0; i < 4; i++)
 391                         if(!HexToInt(ip[i], ident + i*2))
 392                                 return false;
 393
 394                 snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
 395
 396                 user->Extend("cgiirc_realhost", new std::string(user->host));
 397                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 398                 user->RemoveCloneCounts();
 399 #ifdef IPV6
 400                 if (user->GetProtocolFamily() == AF_INET6)
 401                         inet_pton(AF_INET6, newip, &((sockaddr_in6*)user->ip)->sin6_addr);
 402                 else
 403 #endif
 404                 inet_aton(newip, &((sockaddr_in*)user->ip)->sin_addr);
 405                 ServerInstance->AddLocalClone(user);
 406                 ServerInstance->AddGlobalClone(user);
 407                 user->CheckClass();
 408                 try
 409                 {
 410                         strlcpy(user->host, newip, 16);
 411                         strlcpy(user->dhost, newip, 16);
 412                         strlcpy(user->ident, "~cgiirc", 8);
 413
 414                         bool cached;
 415                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newip, false, user, user->GetFd(), "IDENT", cached);
 416                         ServerInstance->AddResolver(r, cached);
 417                 }
 418                 catch (...)
 419                 {
 420                         strlcpy(user->host, newip, 16);
 421                         strlcpy(user->dhost, newip, 16);
 422                         strlcpy(user->ident, "~cgiirc", 8);
 423                         user->InvalidateCache();
 424
 425                         if(NotifyOpers)
 426                                  ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 427                 }
 428                 /*strlcpy(user->host, newip, 16);
 429                 strlcpy(user->dhost, newip, 16);
 430                 strlcpy(user->ident, "~cgiirc", 8);*/
 431
 432                 return true;
 433         }
 434
 435         bool IsValidHost(const std::string &host)
 436         {
 437                 if(!host.size())
 438                         return false;
 439
 440                 for(unsigned int i = 0; i < host.size(); i++)
 441                 {
 442                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 443                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 444                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 445                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 446                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 447
 448                                 continue;
 449                         else
 450                                 return false;
 451                 }
 452
 453                 return true;
 454         }
 455
 456         bool IsValidIP(const std::string &ip)
 457         {
 458                 if(ip.size() < 7 || ip.size() > 15)
 459                         return false;
 460
 461                 short sincedot = 0;
 462                 short dots = 0;
 463
 464                 for(unsigned int i = 0; i < ip.size(); i++)
 465                 {
 466                         if((dots <= 3) && (sincedot <= 3))
 467                         {
 468                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 469                                 {
 470                                         sincedot++;
 471                                 }
 472                                 else if(ip[i] == '.')
 473                                 {
 474                                         sincedot = 0;
 475                                         dots++;
 476                                 }
 477                         }
 478                         else
 479                         {
 480                                 return false;
 481
 482                         }
 483                 }
 484
 485                 if(dots != 3)
 486                         return false;
 487
 488                 return true;
 489         }
 490
 491         bool HexToInt(int &out, const char* in)
 492         {
 493                 char ip[3];
 494                 ip[0] = in[0];
 495                 ip[1] = in[1];
 496                 ip[2] = 0;
 497                 out = strtol(ip, NULL, 16);
 498
 499                 if(out > 255 || out < 0)
 500                         return false;
 501
 502                 return true;
 503         }
 504
 505         virtual ~ModuleCgiIRC()
 506         {
 507         }
 508
 509         virtual Version GetVersion()
 510         {
 511                 return Version(1,1,0,0,VF_VENDOR,API_VERSION);
 512         }
 513
 514 };
 515
 516 MODULE_INIT(ModuleCgiIRC)