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