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