src/modules/m_cgiirc.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 #ifndef WINDOWS
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #endif
  21
  22 /* $ModDesc: Change user's hosts connecting from known CGI:IRC hosts */
  23
  24 enum CGItype { INVALID, PASS, IDENT, PASSFIRST, IDENTFIRST, WEBIRC };
  25
  26
  27 /** Holds a CGI site's details
  28  */
  29 class CGIhost : public classbase
  30 {
  31 public:
  32         std::string hostmask;
  33         CGItype type;
  34         std::string password;
  35
  36         CGIhost(const std::string &mask = "", CGItype t = IDENTFIRST, const std::string &password ="")
  37         : hostmask(mask), type(t), password(password)
  38         {
  39         }
  40 };
  41 typedef std::vector<CGIhost> CGIHostlist;
  42
  43 class cmd_webirc : public command_t
  44 {
  45         InspIRCd* Me;
  46         CGIHostlist Hosts;
  47         bool notify;
  48         public:
  49                 cmd_webirc(InspIRCd* Me, CGIHostlist &Hosts, bool notify) : command_t(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, userrec *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         userrec* them;
  87         bool notify;
  88  public:
  89         CGIResolver(Module* me, InspIRCd* ServerInstance, bool NotifyOpers, const std::string &source, bool forward, userrec* 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         cmd_webirc* mycommand;
 127         bool NotifyOpers;
 128         CGIHostlist Hosts;
 129 public:
 130         ModuleCgiIRC(InspIRCd* Me) : Module(Me)
 131         {
 132
 133                 OnRehash(NULL,"");
 134                 mycommand=new cmd_webirc(Me, Hosts, NotifyOpers);
 135                 ServerInstance->AddCommand(mycommand);
 136         }
 137
 138         void Implements(char* List)
 139         {
 140                 List[I_OnRehash] = List[I_OnUserRegister] = List[I_OnCleanup] = List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUserQuit] = List[I_OnUserConnect] = 1;
 141         }
 142
 143         virtual Priority Prioritize()
 144         {
 145                 // We want to get here before m_cloaking and m_hostchange etc
 146                 return PRIORITY_FIRST;
 147         }
 148
 149         virtual void OnRehash(userrec* user, const std::string &parameter)
 150         {
 151                 ConfigReader Conf(ServerInstance);
 152
 153                 NotifyOpers = Conf.ReadFlag("cgiirc", "opernotice", 0); // If we send an oper notice when a CGI:IRC has their host changed.
 154
 155                 if(Conf.GetError() == CONF_VALUE_NOT_FOUND)
 156                         NotifyOpers = true;
 157
 158                 for(int i = 0; i < Conf.Enumerate("cgihost"); i++)
 159                 {
 160                         std::string hostmask = Conf.ReadValue("cgihost", "mask", i); // An allowed CGI:IRC host
 161                         std::string type = Conf.ReadValue("cgihost", "type", i); // What type of user-munging we do on this host.
 162                         std::string password = Conf.ReadValue("cgihost", "password", i);
 163
 164                         if(hostmask.length())
 165                         {
 166                                 if (type == "webirc" && !password.length()) {
 167                                                 ServerInstance->Log(DEFAULT, "m_cgiirc: Missing password in config: %s", hostmask.c_str());
 168                                 }
 169                                 else
 170                                 {
 171                                         CGItype cgitype = INVALID;
 172                                         if (type == "pass")
 173                                                 cgitype = PASS;
 174                                         else if (type == "ident")
 175                                                 cgitype = IDENT;
 176                                         else if (type == "passfirst")
 177                                                 cgitype = PASSFIRST;
 178                                         else if (type == "webirc")
 179                                         {
 180                                                 cgitype = WEBIRC;
 181                                         }
 182
 183                                         if (cgitype == INVALID)
 184                                                 cgitype = PASS;
 185
 186                                         Hosts.push_back(CGIhost(hostmask,cgitype, password.length() ? password : "" ));
 187                                 }
 188                         }
 189                         else
 190                         {
 191                                 ServerInstance->Log(DEFAULT, "m_cgiirc.so: Invalid <cgihost:mask> value in config: %s", hostmask.c_str());
 192                                 continue;
 193                         }
 194                 }
 195         }
 196
 197         virtual void OnCleanup(int target_type, void* item)
 198         {
 199                 if(target_type == TYPE_USER)
 200                 {
 201                         userrec* user = (userrec*)item;
 202                         std::string* realhost;
 203                         std::string* realip;
 204
 205                         if(user->GetExt("cgiirc_realhost", realhost))
 206                         {
 207                                 delete realhost;
 208                                 user->Shrink("cgiirc_realhost");
 209                         }
 210
 211                         if(user->GetExt("cgiirc_realip", realip))
 212                         {
 213                                 delete realip;
 214                                 user->Shrink("cgiirc_realip");
 215                         }
 216                 }
 217         }
 218
 219         virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, const std::string &extname, bool displayable)
 220         {
 221                 if((extname == "cgiirc_realhost") || (extname == "cgiirc_realip"))
 222                 {
 223                         std::string* data;
 224
 225                         if(user->GetExt(extname, data))
 226                         {
 227                                 proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, *data);
 228                         }
 229                 }
 230         }
 231
 232         virtual void OnDecodeMetaData(int target_type, void* target, const std::string &extname, const std::string &extdata)
 233         {
 234                 if(target_type == TYPE_USER)
 235                 {
 236                         userrec* dest = (userrec*)target;
 237                         std::string* bleh;
 238                         if(((extname == "cgiirc_realhost") || (extname == "cgiirc_realip")) && (!dest->GetExt(extname, bleh)))
 239                         {
 240                                 dest->Extend(extname, new std::string(extdata));
 241                         }
 242                 }
 243         }
 244
 245         virtual void OnUserQuit(userrec* user, const std::string &message, const std::string &oper_message)
 246         {
 247                 OnCleanup(TYPE_USER, user);
 248         }
 249
 250
 251         virtual int OnUserRegister(userrec* user)
 252         {
 253                 for(CGIHostlist::iterator iter = Hosts.begin(); iter != Hosts.end(); iter++)
 254                 {
 255                         if(ServerInstance->MatchText(user->host, iter->hostmask) || ServerInstance->MatchText(user->GetIPString(), iter->hostmask))
 256                         {
 257                                 // Deal with it...
 258                                 if(iter->type == PASS)
 259                                 {
 260                                         CheckPass(user); // We do nothing if it fails so...
 261                                 }
 262                                 else if(iter->type == PASSFIRST && !CheckPass(user))
 263                                 {
 264                                         // If the password lookup failed, try the ident
 265                                         CheckIdent(user);       // If this fails too, do nothing
 266                                 }
 267                                 else if(iter->type == IDENT)
 268                                 {
 269                                         CheckIdent(user); // Nothing on failure.
 270                                 }
 271                                 else if(iter->type == IDENTFIRST && !CheckIdent(user))
 272                                 {
 273                                         // If the ident lookup fails, try the password.
 274                                         CheckPass(user);
 275                                 }
 276                                 else if(iter->type == WEBIRC)
 277                                 {
 278                                         // We don't need to do anything here
 279                                 }
 280                                 return 0;
 281                         }
 282                 }
 283                 return 0;
 284         }
 285
 286         virtual void OnUserConnect(userrec* user)
 287         {
 288                 std::string *webirc_hostname, *webirc_ip;
 289                 if(user->GetExt("cgiirc_webirc_hostname", webirc_hostname))
 290                 {
 291                         strlcpy(user->host,webirc_hostname->c_str(),63);
 292                         strlcpy(user->dhost,webirc_hostname->c_str(),63);
 293                         delete webirc_hostname;
 294                         user->InvalidateCache();
 295                         user->Shrink("cgiirc_webirc_hostname");
 296                 }
 297                 if(user->GetExt("cgiirc_webirc_ip", webirc_ip))
 298                 {
 299                         bool valid=false;
 300                         user->RemoveCloneCounts();
 301 #ifdef IPV6
 302                         valid = (inet_pton(AF_INET6, webirc_ip->c_str(), &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
 303
 304                         if(!valid)
 305                                 valid = (inet_aton(webirc_ip->c_str(), &((sockaddr_in*)user->ip)->sin_addr));
 306 #else
 307                         if (inet_aton(webirc_ip->c_str(), &((sockaddr_in*)user->ip)->sin_addr))
 308                                 valid = true;
 309 #endif
 310
 311                         delete webirc_ip;
 312                         user->InvalidateCache();
 313                         user->Shrink("cgiirc_webirc_ip");
 314                         ServerInstance->AddLocalClone(user);
 315                         ServerInstance->AddGlobalClone(user);
 316                         user->CheckClass();
 317                 }
 318         }
 319
 320         bool CheckPass(userrec* user)
 321         {
 322                 if(IsValidHost(user->password))
 323                 {
 324                         user->Extend("cgiirc_realhost", new std::string(user->host));
 325                         user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 326                         strlcpy(user->host, user->password, 64);
 327                         strlcpy(user->dhost, user->password, 64);
 328                         user->InvalidateCache();
 329
 330                         bool valid = false;
 331                         user->RemoveCloneCounts();
 332 #ifdef IPV6
 333                         if (user->GetProtocolFamily() == AF_INET6)
 334                                 valid = (inet_pton(AF_INET6, user->password, &((sockaddr_in6*)user->ip)->sin6_addr) > 0);
 335                         else
 336                                 valid = (inet_aton(user->password, &((sockaddr_in*)user->ip)->sin_addr));
 337 #else
 338                         if (inet_aton(user->password, &((sockaddr_in*)user->ip)->sin_addr))
 339                                 valid = true;
 340 #endif
 341                         ServerInstance->AddLocalClone(user);
 342                         ServerInstance->AddGlobalClone(user);
 343                         user->CheckClass();
 344
 345                         if (valid)
 346                         {
 347                                 /* We were given a IP in the password, we don't do DNS so they get this is as their host as well. */
 348                                 if(NotifyOpers)
 349                                         ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);
 350                         }
 351                         else
 352                         {
 353                                 /* We got as resolved hostname in the password. */
 354                                 try
 355                                 {
 356
 357                                         bool cached;
 358                                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, user->password, false, user, user->GetFd(), "PASS", cached);
 359                                         ServerInstance->AddResolver(r, cached);
 360                                 }
 361                                 catch (...)
 362                                 {
 363                                         if (NotifyOpers)
 364                                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 365                                 }
 366                         }
 367
 368                         *user->password = 0;
 369
 370                         /*if(NotifyOpers)
 371                                 ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), changing real host to %s from PASS", user->nick, user->host, user->password);*/
 372
 373                         return true;
 374                 }
 375
 376                 return false;
 377         }
 378
 379         bool CheckIdent(userrec* user)
 380         {
 381                 int ip[4];
 382                 char* ident;
 383                 char newip[16];
 384                 int len = strlen(user->ident);
 385
 386                 if(len == 8)
 387                         ident = user->ident;
 388                 else if(len == 9 && *user->ident == '~')
 389                         ident = user->ident+1;
 390                 else
 391                         return false;
 392
 393                 for(int i = 0; i < 4; i++)
 394                         if(!HexToInt(ip[i], ident + i*2))
 395                                 return false;
 396
 397                 snprintf(newip, 16, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
 398
 399                 user->Extend("cgiirc_realhost", new std::string(user->host));
 400                 user->Extend("cgiirc_realip", new std::string(user->GetIPString()));
 401                 user->RemoveCloneCounts();
 402 #ifdef IPV6
 403                 if (user->GetProtocolFamily() == AF_INET6)
 404                         inet_pton(AF_INET6, newip, &((sockaddr_in6*)user->ip)->sin6_addr);
 405                 else
 406 #endif
 407                 inet_aton(newip, &((sockaddr_in*)user->ip)->sin_addr);
 408                 ServerInstance->AddLocalClone(user);
 409                 ServerInstance->AddGlobalClone(user);
 410                 user->CheckClass();
 411                 try
 412                 {
 413                         strlcpy(user->host, newip, 16);
 414                         strlcpy(user->dhost, newip, 16);
 415                         strlcpy(user->ident, "~cgiirc", 8);
 416
 417                         bool cached;
 418                         CGIResolver* r = new CGIResolver(this, ServerInstance, NotifyOpers, newip, false, user, user->GetFd(), "IDENT", cached);
 419                         ServerInstance->AddResolver(r, cached);
 420                 }
 421                 catch (...)
 422                 {
 423                         strlcpy(user->host, newip, 16);
 424                         strlcpy(user->dhost, newip, 16);
 425                         strlcpy(user->ident, "~cgiirc", 8);
 426                         user->InvalidateCache();
 427
 428                         if(NotifyOpers)
 429                                  ServerInstance->WriteOpers("*** Connecting user %s detected as using CGI:IRC (%s), but i could not resolve their hostname!", user->nick, user->host);
 430                 }
 431                 /*strlcpy(user->host, newip, 16);
 432                 strlcpy(user->dhost, newip, 16);
 433                 strlcpy(user->ident, "~cgiirc", 8);*/
 434
 435                 return true;
 436         }
 437
 438         bool IsValidHost(const std::string &host)
 439         {
 440                 if(!host.size())
 441                         return false;
 442
 443                 for(unsigned int i = 0; i < host.size(); i++)
 444                 {
 445                         if(     ((host[i] >= '0') && (host[i] <= '9')) ||
 446                                         ((host[i] >= 'A') && (host[i] <= 'Z')) ||
 447                                         ((host[i] >= 'a') && (host[i] <= 'z')) ||
 448                                         ((host[i] == '-') && (i > 0) && (i+1 < host.size()) && (host[i-1] != '.') && (host[i+1] != '.')) ||
 449                                         ((host[i] == '.') && (i > 0) && (i+1 < host.size())) )
 450
 451                                 continue;
 452                         else
 453                                 return false;
 454                 }
 455
 456                 return true;
 457         }
 458
 459         bool IsValidIP(const std::string &ip)
 460         {
 461                 if(ip.size() < 7 || ip.size() > 15)
 462                         return false;
 463
 464                 short sincedot = 0;
 465                 short dots = 0;
 466
 467                 for(unsigned int i = 0; i < ip.size(); i++)
 468                 {
 469                         if((dots <= 3) && (sincedot <= 3))
 470                         {
 471                                 if((ip[i] >= '0') && (ip[i] <= '9'))
 472                                 {
 473                                         sincedot++;
 474                                 }
 475                                 else if(ip[i] == '.')
 476                                 {
 477                                         sincedot = 0;
 478                                         dots++;
 479                                 }
 480                         }
 481                         else
 482                         {
 483                                 return false;
 484
 485                         }
 486                 }
 487
 488                 if(dots != 3)
 489                         return false;
 490
 491                 return true;
 492         }
 493
 494         bool HexToInt(int &out, const char* in)
 495         {
 496                 char ip[3];
 497                 ip[0] = in[0];
 498                 ip[1] = in[1];
 499                 ip[2] = 0;
 500                 out = strtol(ip, NULL, 16);
 501
 502                 if(out > 255 || out < 0)
 503                         return false;
 504
 505                 return true;
 506         }
 507
 508         virtual ~ModuleCgiIRC()
 509         {
 510         }
 511
 512         virtual Version GetVersion()
 513         {
 514                 return Version(1,1,0,0,VF_VENDOR,API_VERSION);
 515         }
 516
 517 };
 518
 519 MODULE_INIT(ModuleCgiIRC)