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