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