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