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