src/modules/m_cgiirc.cpp

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