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(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.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                         them->ident.assign("~cgiirc", 0, 8);
 116                         them->InvalidateCache();
 117                         them->CheckLines();
 118                 }
 119         }
 120
 121         virtual void OnError(ResolverError e, const std::string &errormessage)
 122         {
 123                 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
 124                 {
 125                         if (notify)
 126                                 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());
 127                 }
 128         }
 129
 130         virtual ~CGIResolver()
 131         {
 132         }
 133 };
 134
 135 class ModuleCgiIRC : public Module
 136 {
 137         CommandWebirc* mycommand;
 138         bool NotifyOpers;
 139         CGIHostlist Hosts;
 140 public:
 141         ModuleCgiIRC(InspIRCd* Me) : Module(Me)
 142         {
 143
 144                 OnRehash(NULL,"");
 145                 mycommand = new CommandWebirc(Me, Hosts, NotifyOpers);
 146                 ServerInstance->AddCommand(mycommand);
 147
 148                 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnCleanup, I_OnSyncUserMetaData, I_OnDecodeMetaData, I_OnUserDisconnect, I_OnUserConnect };
 149                 ServerInstance->Modules->Attach(eventlist, this, 7);
 150         }
 151
 152
 153         virtual void Prioritize()
 154         {
 155                 ServerInstance->Modules->SetPriority(this, I_OnUserConnect, PRIO_FIRST);
 156         }
 157
 158         virtual void OnRehash(User* user, const std::string &parameter)
 159         {
 160                 ConfigReader Conf(ServerInstance);
 161                 Hosts.clear();
 162
 163                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 164
 165                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 166                         NotifyOpers = true;
 167
 168                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 169                 {
 170                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 171                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 172                         std::string password = Conf.ReadValue("cgihost", "password", i);
 173
 174                         if(hostmask.length())
 175                         {
 176                                 if (type == "webirc" && !password.length()) {
 177                                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 178                                 }
 179                                 else
 180                                 {
 181                                         CGItype cgitype = INVALID;
 182                                         if (type == "pass")
 183                                                 cgitype = PASS;
 184                                         else if (type == "ident")
 185                                                 cgitype = IDENT;
 186                                         else if (type == "passfirst")
 187                                                 cgitype = PASSFIRST;
 188                                         else if (type == "webirc")
 189                                         {
 190                                                 cgitype = WEBIRC;
 191                                         }
 192
 193                                         if (cgitype == INVALID)
 194                                                 cgitype = PASS;
 195
 196                                         Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 197                                 }
 198                         }
 199                         else
 200                         {
 201                                 ServerInstance->Logs->Log("CONFIG",DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 202                                 continue;
 203                         }
 204                 }
 205         }
 206
 207         virtual void OnCleanup(int target_type, void* item)
 208         {
 209                 if(target_type == TYPE_USER)
 210                 {
 211                         User* user = (User*)item;
 212                         std::string* realhost;
 213                         std::string* realip;
 214
 215                         if(user->GetExt("cgiirc_realhost", realhost))
 216                         {
 217                                 delete realhost;
 218                                 user->Shrink("cgiirc_realhost");
 219                         }
 220
 221                         if(user->GetExt("cgiirc_realip", realip))
 222                         {
 223                                 delete realip;
 224                                 user->Shrink("cgiirc_realip");
 225                         }
 226                 }
 227         }
 228
 229         virtual void OnSyncUserMetaData(User* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 230         {
 231                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 232                 {
 233                         std::string* data;
 234
 235                         if(user->GetExt(extname, data))
 236                         {
 237                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 238                         }
 239                 }
 240         }
 241
 242         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 243         {
 244                 if(target_type == TYPE_USER)
 245                 {
 246                         User* dest = (User*)target;
 247                         std::string* bleh;
 248                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 249                         {
 250                                 dest->Extend(extname, new std::string(extdata));
 251                         }
 252                 }
 253         }
 254
 255         virtual void OnUserDisconnect(User* user)
 256         {
 257                 OnCleanup(TYPE_USER, user);
 258         }
 259
 260
 261         virtual int OnUserRegister(User* user)
 262         {
 263                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 264                 {
 265                         if(ServerInstance->MatchText(user->host, iter->hostmask) || ServerInstance->MatchText(user->GetIPString(), iter->hostmask))
 266                         {
 267                                 // Deal with it...
 268                                 if(iter->type == PASS)
 269                                 {
 270                                         CheckPass(user); // We do nothing if it fails so...
 271                                         user->CheckLines();
 272                                 }
 273                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 274                                 {
 275                                         // If the password lookup failed, try the ident
 276                                         CheckIdent(user);       // If this fails too, do nothing
 277                                         user->CheckLines();
 278                                 }
 279                                 else if(iter->type == IDENT)
 280                                 {
 281                                         CheckIdent(user); // Nothing on failure.
 282                                         user->CheckLines();
 283                                 }
 284                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 285                                 {
 286                                         // If the ident lookup fails, try the password.
 287                                         CheckPass(user);
 288                                         user->CheckLines();
 289                                 }
 290                                 else if(iter->type == WEBIRC)
 291                                 {
 292                                         // We don't need to do anything here
 293                                 }
 294                                 return 0;
 295                         }
 296                 }
 297                 return 0;
 298         }
 299
 300         virtual void OnUserConnect(User* user)
 301         {
 302                 std::string *webirc_hostname, *webirc_ip;
 303                 if(user->GetExt("cgiirc_webirc_hostname", webirc_hostname))
 304                 {
 305                         user->host.assign(*webirc_hostname, 0, 64);
 306                         user->dhost.assign(*webirc_hostname, 0, 64);
 307                         delete webirc_hostname;
 308                         user->InvalidateCache();
 309                         user->Shrink("cgiirc_webirc_hostname");
 310                 }
 311                 if(user->GetExt("cgiirc_webirc_ip", webirc_ip))
 312                 {
 313                         bool valid=false;
 314                         ServerInstance->Users->RemoveCloneCounts(user);
 315 #ifdef IPV6
 316                         valid = (inet_pton(AF_INET6, webirc_ip->c_str(), &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
 317
 318                         if(!valid)
 319                                 valid = (inet_aton(webirc_ip->c_str(), &((sockaddr_in*)user->ip)->sin_addr));
 320 #else
 321                         if (inet_aton(webirc_ip->c_str(), &((sockaddr_in*)user->ip)->sin_addr))
 322                                 valid = true;
 323 #endif
 324
 325                         delete webirc_ip;
 326                         user->InvalidateCache();
 327                         user->Shrink("cgiirc_webirc_ip");
 328                         ServerInstance->Users->AddLocalClone(user);
 329                         ServerInstance->Users->AddGlobalClone(user);
 330                         user->CheckClass();
 331                         user->CheckLines();
 332                 }
 333         }
 334
 335         bool CheckPass(User* user)
 336         {
 337                 if(IsValidHost(user->password))
 338                 {
 339                         user->Extend("cgiirc_realhost", new std::string(user->host));
 340                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 341                         user->host.assign(user->password, 0, 64);
 342                         user->dhost.assign(user->password, 0, 64);
 343                         user->InvalidateCache();
 344
 345                         bool valid = false;
 346                         ServerInstance->Users->RemoveCloneCounts(user);
 347 #ifdef IPV6
 348                         if (user->GetProtocolFamily() == AF_INET6)
 349                                 valid = (inet_pton(AF_INET6, user->password.c_str(), &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
 350                         else
 351                                 valid = (inet_aton(user->password.c_str(), &((sockaddr_in*)user->ip)->sin_addr));
 352 #else
 353                         if (inet_aton(user->password.c_str(), &((sockaddr_in*)user->ip)->sin_addr))
 354                                 valid = true;
 355 #endif
 356                         ServerInstance->Users->AddLocalClone(user);
 357                         ServerInstance->Users->AddGlobalClone(user);
 358                         user->CheckClass();
 359
 360                         if (valid)
 361                         {
 362                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 363                                 if(NotifyOpers)
 364                                         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());
 365                         }
 366                         else
 367                         {
 368                                 /* We got as resolved hostname in the password. */
 369                                 try
 370                                 {
 371
 372                                         bool cached;
 373                                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
 374                                         ServerInstance->AddResolver(r, cached);
 375                                 }
 376                                 catch (...)
 377                                 {
 378                                         if (NotifyOpers)
 379                                                 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());
 380                                 }
 381                         }
 382
 383                         user->password.clear();
 384                         return true;
 385                 }
 386
 387                 return false;
 388         }
 389
 390         bool CheckIdent(User* user)
 391         {
 392                 int ip[4];
 393                 const char* ident;
 394                 char newip[16];
 395                 int len = user->ident.length();
 396
 397                 if(len == 8)
 398                         ident = user->ident.c_str();
 399                 else if(len == 9 && user->ident[0] == '~')
 400                         ident = user->ident.c_str() + 1;
 401                 else
 402                         return false;
 403
 404                 for(int i = 0; i < 4; i++)
 405                         if(!HexToInt(ip[i], ident + i*2))
 406                                 return false;
 407
 408                 snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
 409
 410                 user->Extend("cgiirc_realhost", new std::string(user->host));
 411                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 412                 ServerInstance->Users->RemoveCloneCounts(user);
 413 #ifdef IPV6
 414                 if (user->GetProtocolFamily() == AF_INET6)
 415                         inet_pton(AF_INET6, newip, &((sockaddr_in6*)user->ip)->sin6_addr);
 416                 else
 417 #endif
 418                 inet_aton(newip, &((sockaddr_in*)user->ip)->sin_addr);
 419                 ServerInstance->Users->AddLocalClone(user);
 420                 ServerInstance->Users->AddGlobalClone(user);
 421                 user->CheckClass();
 422                 try
 423                 {
 424                         user->host.assign(newip, 0, 16);
 425                         user->dhost.assign(newip, 0, 16);
 426                         user->ident.assign("~cgiirc", 0, 8);
 427
 428                         bool cached;
 429                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newip, false, user, user->GetFd(), "IDENT", cached);
 430                         ServerInstance->AddResolver(r, cached);
 431                 }
 432                 catch (...)
 433                 {
 434                         user->host.assign(newip, 0, 16);
 435                         user->dhost.assign(newip, 0, 16);
 436                         user->ident.assign("~cgiirc", 0, 8);
 437                         user->InvalidateCache();
 438
 439                         if(NotifyOpers)
 440                                  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());
 441                 }
 442
 443                 return true;
 444         }
 445
 446         bool IsValidHost(const std::string &host)
 447         {
 448                 if(!host.size())
 449                         return false;
 450
 451                 for(unsigned int i = 0; i < host.size(); i++)
 452                 {
 453                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 454                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 455                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 456                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 457                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 458
 459                                 continue;
 460                         else
 461                                 return false;
 462                 }
 463
 464                 return true;
 465         }
 466
 467         bool IsValidIP(const std::string &ip)
 468         {
 469                 if(ip.size() < 7 || ip.size() > 15)
 470                         return false;
 471
 472                 short sincedot = 0;
 473                 short dots = 0;
 474
 475                 for(unsigned int i = 0; i < ip.size(); i++)
 476                 {
 477                         if((dots <= 3) && (sincedot <= 3))
 478                         {
 479                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 480                                 {
 481                                         sincedot++;
 482                                 }
 483                                 else if(ip[i] == '.')
 484                                 {
 485                                         sincedot = 0;
 486                                         dots++;
 487                                 }
 488                         }
 489                         else
 490                         {
 491                                 return false;
 492
 493                         }
 494                 }
 495
 496                 if(dots != 3)
 497                         return false;
 498
 499                 return true;
 500         }
 501
 502         bool HexToInt(int &out, const char* in)
 503         {
 504                 char ip[3];
 505                 ip[0] = in[0];
 506                 ip[1] = in[1];
 507                 ip[2] = 0;
 508                 out = strtol(ip, NULL, 16);
 509
 510                 if(out > 255 || out < 0)
 511                         return false;
 512
 513                 return true;
 514         }
 515
 516         virtual ~ModuleCgiIRC()
 517         {
 518         }
 519
 520         virtual Version GetVersion()
 521         {
 522                 return Version(1,2,0,0,VF_VENDOR,API_VERSION);
 523         }
 524
 525 };
 526
 527 MODULE_INIT(ModuleCgiIRC)