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